1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "asm/assembler.hpp" 27 #include "asm/assembler.inline.hpp" 28 #include "compiler/disassembler.hpp" 29 #include "gc/shared/cardTableModRefBS.hpp" 30 #include "gc/shared/collectedHeap.inline.hpp" 31 #include "interpreter/interpreter.hpp" 32 #include "memory/resourceArea.hpp" 33 #include "memory/universe.hpp" 34 #include "oops/klass.inline.hpp" 35 #include "prims/methodHandles.hpp" 36 #include "runtime/biasedLocking.hpp" 37 #include "runtime/interfaceSupport.hpp" 38 #include "runtime/objectMonitor.hpp" 39 #include "runtime/os.hpp" 40 #include "runtime/sharedRuntime.hpp" 41 #include "runtime/stubRoutines.hpp" 42 #include "utilities/macros.hpp" 43 #if INCLUDE_ALL_GCS 44 #include "gc/g1/g1CollectedHeap.inline.hpp" 45 #include "gc/g1/g1SATBCardTableModRefBS.hpp" 46 #include "gc/g1/heapRegion.hpp" 47 #endif // INCLUDE_ALL_GCS 48 49 #ifdef PRODUCT 50 #define BLOCK_COMMENT(str) /* nothing */ 51 #define STOP(error) stop(error) 52 #else 53 #define BLOCK_COMMENT(str) block_comment(str) 54 #define STOP(error) block_comment(error); stop(error) 55 #endif 56 57 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 58 59 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 60 61 #ifdef ASSERT 62 bool AbstractAssembler::pd_check_instruction_mark() { return true; } 63 #endif 64 65 static Assembler::Condition reverse[] = { 66 Assembler::noOverflow /* overflow = 0x0 */ , 67 Assembler::overflow /* noOverflow = 0x1 */ , 68 Assembler::aboveEqual /* carrySet = 0x2, below = 0x2 */ , 69 Assembler::below /* aboveEqual = 0x3, carryClear = 0x3 */ , 70 Assembler::notZero /* zero = 0x4, equal = 0x4 */ , 71 Assembler::zero /* notZero = 0x5, notEqual = 0x5 */ , 72 Assembler::above /* belowEqual = 0x6 */ , 73 Assembler::belowEqual /* above = 0x7 */ , 74 Assembler::positive /* negative = 0x8 */ , 75 Assembler::negative /* positive = 0x9 */ , 76 Assembler::noParity /* parity = 0xa */ , 77 Assembler::parity /* noParity = 0xb */ , 78 Assembler::greaterEqual /* less = 0xc */ , 79 Assembler::less /* greaterEqual = 0xd */ , 80 Assembler::greater /* lessEqual = 0xe */ , 81 Assembler::lessEqual /* greater = 0xf, */ 82 83 }; 84 85 86 // Implementation of MacroAssembler 87 88 // First all the versions that have distinct versions depending on 32/64 bit 89 // Unless the difference is trivial (1 line or so). 90 91 #ifndef _LP64 92 93 // 32bit versions 94 95 Address MacroAssembler::as_Address(AddressLiteral adr) { 96 return Address(adr.target(), adr.rspec()); 97 } 98 99 Address MacroAssembler::as_Address(ArrayAddress adr) { 100 return Address::make_array(adr); 101 } 102 103 void MacroAssembler::call_VM_leaf_base(address entry_point, 104 int number_of_arguments) { 105 call(RuntimeAddress(entry_point)); 106 increment(rsp, number_of_arguments * wordSize); 107 } 108 109 void MacroAssembler::cmpklass(Address src1, Metadata* obj) { 110 cmp_literal32(src1, (int32_t)obj, metadata_Relocation::spec_for_immediate()); 111 } 112 113 void MacroAssembler::cmpklass(Register src1, Metadata* obj) { 114 cmp_literal32(src1, (int32_t)obj, metadata_Relocation::spec_for_immediate()); 115 } 116 117 void MacroAssembler::cmpoop(Address src1, jobject obj) { 118 cmp_literal32(src1, (int32_t)obj, oop_Relocation::spec_for_immediate()); 119 } 120 121 void MacroAssembler::cmpoop(Register src1, jobject obj) { 122 cmp_literal32(src1, (int32_t)obj, oop_Relocation::spec_for_immediate()); 123 } 124 125 void MacroAssembler::extend_sign(Register hi, Register lo) { 126 // According to Intel Doc. AP-526, "Integer Divide", p.18. 127 if (VM_Version::is_P6() && hi == rdx && lo == rax) { 128 cdql(); 129 } else { 130 movl(hi, lo); 131 sarl(hi, 31); 132 } 133 } 134 135 void MacroAssembler::jC2(Register tmp, Label& L) { 136 // set parity bit if FPU flag C2 is set (via rax) 137 save_rax(tmp); 138 fwait(); fnstsw_ax(); 139 sahf(); 140 restore_rax(tmp); 141 // branch 142 jcc(Assembler::parity, L); 143 } 144 145 void MacroAssembler::jnC2(Register tmp, Label& L) { 146 // set parity bit if FPU flag C2 is set (via rax) 147 save_rax(tmp); 148 fwait(); fnstsw_ax(); 149 sahf(); 150 restore_rax(tmp); 151 // branch 152 jcc(Assembler::noParity, L); 153 } 154 155 // 32bit can do a case table jump in one instruction but we no longer allow the base 156 // to be installed in the Address class 157 void MacroAssembler::jump(ArrayAddress entry) { 158 jmp(as_Address(entry)); 159 } 160 161 // Note: y_lo will be destroyed 162 void MacroAssembler::lcmp2int(Register x_hi, Register x_lo, Register y_hi, Register y_lo) { 163 // Long compare for Java (semantics as described in JVM spec.) 164 Label high, low, done; 165 166 cmpl(x_hi, y_hi); 167 jcc(Assembler::less, low); 168 jcc(Assembler::greater, high); 169 // x_hi is the return register 170 xorl(x_hi, x_hi); 171 cmpl(x_lo, y_lo); 172 jcc(Assembler::below, low); 173 jcc(Assembler::equal, done); 174 175 bind(high); 176 xorl(x_hi, x_hi); 177 increment(x_hi); 178 jmp(done); 179 180 bind(low); 181 xorl(x_hi, x_hi); 182 decrementl(x_hi); 183 184 bind(done); 185 } 186 187 void MacroAssembler::lea(Register dst, AddressLiteral src) { 188 mov_literal32(dst, (int32_t)src.target(), src.rspec()); 189 } 190 191 void MacroAssembler::lea(Address dst, AddressLiteral adr) { 192 // leal(dst, as_Address(adr)); 193 // see note in movl as to why we must use a move 194 mov_literal32(dst, (int32_t) adr.target(), adr.rspec()); 195 } 196 197 void MacroAssembler::leave() { 198 mov(rsp, rbp); 199 pop(rbp); 200 } 201 202 void MacroAssembler::lmul(int x_rsp_offset, int y_rsp_offset) { 203 // Multiplication of two Java long values stored on the stack 204 // as illustrated below. Result is in rdx:rax. 205 // 206 // rsp ---> [ ?? ] \ \ 207 // .... | y_rsp_offset | 208 // [ y_lo ] / (in bytes) | x_rsp_offset 209 // [ y_hi ] | (in bytes) 210 // .... | 211 // [ x_lo ] / 212 // [ x_hi ] 213 // .... 214 // 215 // Basic idea: lo(result) = lo(x_lo * y_lo) 216 // hi(result) = hi(x_lo * y_lo) + lo(x_hi * y_lo) + lo(x_lo * y_hi) 217 Address x_hi(rsp, x_rsp_offset + wordSize); Address x_lo(rsp, x_rsp_offset); 218 Address y_hi(rsp, y_rsp_offset + wordSize); Address y_lo(rsp, y_rsp_offset); 219 Label quick; 220 // load x_hi, y_hi and check if quick 221 // multiplication is possible 222 movl(rbx, x_hi); 223 movl(rcx, y_hi); 224 movl(rax, rbx); 225 orl(rbx, rcx); // rbx, = 0 <=> x_hi = 0 and y_hi = 0 226 jcc(Assembler::zero, quick); // if rbx, = 0 do quick multiply 227 // do full multiplication 228 // 1st step 229 mull(y_lo); // x_hi * y_lo 230 movl(rbx, rax); // save lo(x_hi * y_lo) in rbx, 231 // 2nd step 232 movl(rax, x_lo); 233 mull(rcx); // x_lo * y_hi 234 addl(rbx, rax); // add lo(x_lo * y_hi) to rbx, 235 // 3rd step 236 bind(quick); // note: rbx, = 0 if quick multiply! 237 movl(rax, x_lo); 238 mull(y_lo); // x_lo * y_lo 239 addl(rdx, rbx); // correct hi(x_lo * y_lo) 240 } 241 242 void MacroAssembler::lneg(Register hi, Register lo) { 243 negl(lo); 244 adcl(hi, 0); 245 negl(hi); 246 } 247 248 void MacroAssembler::lshl(Register hi, Register lo) { 249 // Java shift left long support (semantics as described in JVM spec., p.305) 250 // (basic idea for shift counts s >= n: x << s == (x << n) << (s - n)) 251 // shift value is in rcx ! 252 assert(hi != rcx, "must not use rcx"); 253 assert(lo != rcx, "must not use rcx"); 254 const Register s = rcx; // shift count 255 const int n = BitsPerWord; 256 Label L; 257 andl(s, 0x3f); // s := s & 0x3f (s < 0x40) 258 cmpl(s, n); // if (s < n) 259 jcc(Assembler::less, L); // else (s >= n) 260 movl(hi, lo); // x := x << n 261 xorl(lo, lo); 262 // Note: subl(s, n) is not needed since the Intel shift instructions work rcx mod n! 263 bind(L); // s (mod n) < n 264 shldl(hi, lo); // x := x << s 265 shll(lo); 266 } 267 268 269 void MacroAssembler::lshr(Register hi, Register lo, bool sign_extension) { 270 // Java shift right long support (semantics as described in JVM spec., p.306 & p.310) 271 // (basic idea for shift counts s >= n: x >> s == (x >> n) >> (s - n)) 272 assert(hi != rcx, "must not use rcx"); 273 assert(lo != rcx, "must not use rcx"); 274 const Register s = rcx; // shift count 275 const int n = BitsPerWord; 276 Label L; 277 andl(s, 0x3f); // s := s & 0x3f (s < 0x40) 278 cmpl(s, n); // if (s < n) 279 jcc(Assembler::less, L); // else (s >= n) 280 movl(lo, hi); // x := x >> n 281 if (sign_extension) sarl(hi, 31); 282 else xorl(hi, hi); 283 // Note: subl(s, n) is not needed since the Intel shift instructions work rcx mod n! 284 bind(L); // s (mod n) < n 285 shrdl(lo, hi); // x := x >> s 286 if (sign_extension) sarl(hi); 287 else shrl(hi); 288 } 289 290 void MacroAssembler::movoop(Register dst, jobject obj) { 291 mov_literal32(dst, (int32_t)obj, oop_Relocation::spec_for_immediate()); 292 } 293 294 void MacroAssembler::movoop(Address dst, jobject obj) { 295 mov_literal32(dst, (int32_t)obj, oop_Relocation::spec_for_immediate()); 296 } 297 298 void MacroAssembler::mov_metadata(Register dst, Metadata* obj) { 299 mov_literal32(dst, (int32_t)obj, metadata_Relocation::spec_for_immediate()); 300 } 301 302 void MacroAssembler::mov_metadata(Address dst, Metadata* obj) { 303 mov_literal32(dst, (int32_t)obj, metadata_Relocation::spec_for_immediate()); 304 } 305 306 void MacroAssembler::movptr(Register dst, AddressLiteral src, Register scratch) { 307 // scratch register is not used, 308 // it is defined to match parameters of 64-bit version of this method. 309 if (src.is_lval()) { 310 mov_literal32(dst, (intptr_t)src.target(), src.rspec()); 311 } else { 312 movl(dst, as_Address(src)); 313 } 314 } 315 316 void MacroAssembler::movptr(ArrayAddress dst, Register src) { 317 movl(as_Address(dst), src); 318 } 319 320 void MacroAssembler::movptr(Register dst, ArrayAddress src) { 321 movl(dst, as_Address(src)); 322 } 323 324 // src should NEVER be a real pointer. Use AddressLiteral for true pointers 325 void MacroAssembler::movptr(Address dst, intptr_t src) { 326 movl(dst, src); 327 } 328 329 330 void MacroAssembler::pop_callee_saved_registers() { 331 pop(rcx); 332 pop(rdx); 333 pop(rdi); 334 pop(rsi); 335 } 336 337 void MacroAssembler::pop_fTOS() { 338 fld_d(Address(rsp, 0)); 339 addl(rsp, 2 * wordSize); 340 } 341 342 void MacroAssembler::push_callee_saved_registers() { 343 push(rsi); 344 push(rdi); 345 push(rdx); 346 push(rcx); 347 } 348 349 void MacroAssembler::push_fTOS() { 350 subl(rsp, 2 * wordSize); 351 fstp_d(Address(rsp, 0)); 352 } 353 354 355 void MacroAssembler::pushoop(jobject obj) { 356 push_literal32((int32_t)obj, oop_Relocation::spec_for_immediate()); 357 } 358 359 void MacroAssembler::pushklass(Metadata* obj) { 360 push_literal32((int32_t)obj, metadata_Relocation::spec_for_immediate()); 361 } 362 363 void MacroAssembler::pushptr(AddressLiteral src) { 364 if (src.is_lval()) { 365 push_literal32((int32_t)src.target(), src.rspec()); 366 } else { 367 pushl(as_Address(src)); 368 } 369 } 370 371 void MacroAssembler::set_word_if_not_zero(Register dst) { 372 xorl(dst, dst); 373 set_byte_if_not_zero(dst); 374 } 375 376 static void pass_arg0(MacroAssembler* masm, Register arg) { 377 masm->push(arg); 378 } 379 380 static void pass_arg1(MacroAssembler* masm, Register arg) { 381 masm->push(arg); 382 } 383 384 static void pass_arg2(MacroAssembler* masm, Register arg) { 385 masm->push(arg); 386 } 387 388 static void pass_arg3(MacroAssembler* masm, Register arg) { 389 masm->push(arg); 390 } 391 392 #ifndef PRODUCT 393 extern "C" void findpc(intptr_t x); 394 #endif 395 396 void MacroAssembler::debug32(int rdi, int rsi, int rbp, int rsp, int rbx, int rdx, int rcx, int rax, int eip, char* msg) { 397 // In order to get locks to work, we need to fake a in_VM state 398 JavaThread* thread = JavaThread::current(); 399 JavaThreadState saved_state = thread->thread_state(); 400 thread->set_thread_state(_thread_in_vm); 401 if (ShowMessageBoxOnError) { 402 JavaThread* thread = JavaThread::current(); 403 JavaThreadState saved_state = thread->thread_state(); 404 thread->set_thread_state(_thread_in_vm); 405 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) { 406 ttyLocker ttyl; 407 BytecodeCounter::print(); 408 } 409 // To see where a verify_oop failed, get $ebx+40/X for this frame. 410 // This is the value of eip which points to where verify_oop will return. 411 if (os::message_box(msg, "Execution stopped, print registers?")) { 412 print_state32(rdi, rsi, rbp, rsp, rbx, rdx, rcx, rax, eip); 413 BREAKPOINT; 414 } 415 } else { 416 ttyLocker ttyl; 417 ::tty->print_cr("=============== DEBUG MESSAGE: %s ================\n", msg); 418 } 419 // Don't assert holding the ttyLock 420 assert(false, err_msg("DEBUG MESSAGE: %s", msg)); 421 ThreadStateTransition::transition(thread, _thread_in_vm, saved_state); 422 } 423 424 void MacroAssembler::print_state32(int rdi, int rsi, int rbp, int rsp, int rbx, int rdx, int rcx, int rax, int eip) { 425 ttyLocker ttyl; 426 FlagSetting fs(Debugging, true); 427 tty->print_cr("eip = 0x%08x", eip); 428 #ifndef PRODUCT 429 if ((WizardMode || Verbose) && PrintMiscellaneous) { 430 tty->cr(); 431 findpc(eip); 432 tty->cr(); 433 } 434 #endif 435 #define PRINT_REG(rax) \ 436 { tty->print("%s = ", #rax); os::print_location(tty, rax); } 437 PRINT_REG(rax); 438 PRINT_REG(rbx); 439 PRINT_REG(rcx); 440 PRINT_REG(rdx); 441 PRINT_REG(rdi); 442 PRINT_REG(rsi); 443 PRINT_REG(rbp); 444 PRINT_REG(rsp); 445 #undef PRINT_REG 446 // Print some words near top of staack. 447 int* dump_sp = (int*) rsp; 448 for (int col1 = 0; col1 < 8; col1++) { 449 tty->print("(rsp+0x%03x) 0x%08x: ", (int)((intptr_t)dump_sp - (intptr_t)rsp), (intptr_t)dump_sp); 450 os::print_location(tty, *dump_sp++); 451 } 452 for (int row = 0; row < 16; row++) { 453 tty->print("(rsp+0x%03x) 0x%08x: ", (int)((intptr_t)dump_sp - (intptr_t)rsp), (intptr_t)dump_sp); 454 for (int col = 0; col < 8; col++) { 455 tty->print(" 0x%08x", *dump_sp++); 456 } 457 tty->cr(); 458 } 459 // Print some instructions around pc: 460 Disassembler::decode((address)eip-64, (address)eip); 461 tty->print_cr("--------"); 462 Disassembler::decode((address)eip, (address)eip+32); 463 } 464 465 void MacroAssembler::stop(const char* msg) { 466 ExternalAddress message((address)msg); 467 // push address of message 468 pushptr(message.addr()); 469 { Label L; call(L, relocInfo::none); bind(L); } // push eip 470 pusha(); // push registers 471 call(RuntimeAddress(CAST_FROM_FN_PTR(address, MacroAssembler::debug32))); 472 hlt(); 473 } 474 475 void MacroAssembler::warn(const char* msg) { 476 push_CPU_state(); 477 478 ExternalAddress message((address) msg); 479 // push address of message 480 pushptr(message.addr()); 481 482 call(RuntimeAddress(CAST_FROM_FN_PTR(address, warning))); 483 addl(rsp, wordSize); // discard argument 484 pop_CPU_state(); 485 } 486 487 void MacroAssembler::print_state() { 488 { Label L; call(L, relocInfo::none); bind(L); } // push eip 489 pusha(); // push registers 490 491 push_CPU_state(); 492 call(RuntimeAddress(CAST_FROM_FN_PTR(address, MacroAssembler::print_state32))); 493 pop_CPU_state(); 494 495 popa(); 496 addl(rsp, wordSize); 497 } 498 499 #else // _LP64 500 501 // 64 bit versions 502 503 Address MacroAssembler::as_Address(AddressLiteral adr) { 504 // amd64 always does this as a pc-rel 505 // we can be absolute or disp based on the instruction type 506 // jmp/call are displacements others are absolute 507 assert(!adr.is_lval(), "must be rval"); 508 assert(reachable(adr), "must be"); 509 return Address((int32_t)(intptr_t)(adr.target() - pc()), adr.target(), adr.reloc()); 510 511 } 512 513 Address MacroAssembler::as_Address(ArrayAddress adr) { 514 AddressLiteral base = adr.base(); 515 lea(rscratch1, base); 516 Address index = adr.index(); 517 assert(index._disp == 0, "must not have disp"); // maybe it can? 518 Address array(rscratch1, index._index, index._scale, index._disp); 519 return array; 520 } 521 522 void MacroAssembler::call_VM_leaf_base(address entry_point, int num_args) { 523 Label L, E; 524 525 #ifdef _WIN64 526 // Windows always allocates space for it's register args 527 assert(num_args <= 4, "only register arguments supported"); 528 subq(rsp, frame::arg_reg_save_area_bytes); 529 #endif 530 531 // Align stack if necessary 532 testl(rsp, 15); 533 jcc(Assembler::zero, L); 534 535 subq(rsp, 8); 536 { 537 call(RuntimeAddress(entry_point)); 538 } 539 addq(rsp, 8); 540 jmp(E); 541 542 bind(L); 543 { 544 call(RuntimeAddress(entry_point)); 545 } 546 547 bind(E); 548 549 #ifdef _WIN64 550 // restore stack pointer 551 addq(rsp, frame::arg_reg_save_area_bytes); 552 #endif 553 554 } 555 556 void MacroAssembler::cmp64(Register src1, AddressLiteral src2) { 557 assert(!src2.is_lval(), "should use cmpptr"); 558 559 if (reachable(src2)) { 560 cmpq(src1, as_Address(src2)); 561 } else { 562 lea(rscratch1, src2); 563 Assembler::cmpq(src1, Address(rscratch1, 0)); 564 } 565 } 566 567 int MacroAssembler::corrected_idivq(Register reg) { 568 // Full implementation of Java ldiv and lrem; checks for special 569 // case as described in JVM spec., p.243 & p.271. The function 570 // returns the (pc) offset of the idivl instruction - may be needed 571 // for implicit exceptions. 572 // 573 // normal case special case 574 // 575 // input : rax: dividend min_long 576 // reg: divisor (may not be eax/edx) -1 577 // 578 // output: rax: quotient (= rax idiv reg) min_long 579 // rdx: remainder (= rax irem reg) 0 580 assert(reg != rax && reg != rdx, "reg cannot be rax or rdx register"); 581 static const int64_t min_long = 0x8000000000000000; 582 Label normal_case, special_case; 583 584 // check for special case 585 cmp64(rax, ExternalAddress((address) &min_long)); 586 jcc(Assembler::notEqual, normal_case); 587 xorl(rdx, rdx); // prepare rdx for possible special case (where 588 // remainder = 0) 589 cmpq(reg, -1); 590 jcc(Assembler::equal, special_case); 591 592 // handle normal case 593 bind(normal_case); 594 cdqq(); 595 int idivq_offset = offset(); 596 idivq(reg); 597 598 // normal and special case exit 599 bind(special_case); 600 601 return idivq_offset; 602 } 603 604 void MacroAssembler::decrementq(Register reg, int value) { 605 if (value == min_jint) { subq(reg, value); return; } 606 if (value < 0) { incrementq(reg, -value); return; } 607 if (value == 0) { ; return; } 608 if (value == 1 && UseIncDec) { decq(reg) ; return; } 609 /* else */ { subq(reg, value) ; return; } 610 } 611 612 void MacroAssembler::decrementq(Address dst, int value) { 613 if (value == min_jint) { subq(dst, value); return; } 614 if (value < 0) { incrementq(dst, -value); return; } 615 if (value == 0) { ; return; } 616 if (value == 1 && UseIncDec) { decq(dst) ; return; } 617 /* else */ { subq(dst, value) ; return; } 618 } 619 620 void MacroAssembler::incrementq(AddressLiteral dst) { 621 if (reachable(dst)) { 622 incrementq(as_Address(dst)); 623 } else { 624 lea(rscratch1, dst); 625 incrementq(Address(rscratch1, 0)); 626 } 627 } 628 629 void MacroAssembler::incrementq(Register reg, int value) { 630 if (value == min_jint) { addq(reg, value); return; } 631 if (value < 0) { decrementq(reg, -value); return; } 632 if (value == 0) { ; return; } 633 if (value == 1 && UseIncDec) { incq(reg) ; return; } 634 /* else */ { addq(reg, value) ; return; } 635 } 636 637 void MacroAssembler::incrementq(Address dst, int value) { 638 if (value == min_jint) { addq(dst, value); return; } 639 if (value < 0) { decrementq(dst, -value); return; } 640 if (value == 0) { ; return; } 641 if (value == 1 && UseIncDec) { incq(dst) ; return; } 642 /* else */ { addq(dst, value) ; return; } 643 } 644 645 // 32bit can do a case table jump in one instruction but we no longer allow the base 646 // to be installed in the Address class 647 void MacroAssembler::jump(ArrayAddress entry) { 648 lea(rscratch1, entry.base()); 649 Address dispatch = entry.index(); 650 assert(dispatch._base == noreg, "must be"); 651 dispatch._base = rscratch1; 652 jmp(dispatch); 653 } 654 655 void MacroAssembler::lcmp2int(Register x_hi, Register x_lo, Register y_hi, Register y_lo) { 656 ShouldNotReachHere(); // 64bit doesn't use two regs 657 cmpq(x_lo, y_lo); 658 } 659 660 void MacroAssembler::lea(Register dst, AddressLiteral src) { 661 mov_literal64(dst, (intptr_t)src.target(), src.rspec()); 662 } 663 664 void MacroAssembler::lea(Address dst, AddressLiteral adr) { 665 mov_literal64(rscratch1, (intptr_t)adr.target(), adr.rspec()); 666 movptr(dst, rscratch1); 667 } 668 669 void MacroAssembler::leave() { 670 // %%% is this really better? Why not on 32bit too? 671 emit_int8((unsigned char)0xC9); // LEAVE 672 } 673 674 void MacroAssembler::lneg(Register hi, Register lo) { 675 ShouldNotReachHere(); // 64bit doesn't use two regs 676 negq(lo); 677 } 678 679 void MacroAssembler::movoop(Register dst, jobject obj) { 680 mov_literal64(dst, (intptr_t)obj, oop_Relocation::spec_for_immediate()); 681 } 682 683 void MacroAssembler::movoop(Address dst, jobject obj) { 684 mov_literal64(rscratch1, (intptr_t)obj, oop_Relocation::spec_for_immediate()); 685 movq(dst, rscratch1); 686 } 687 688 void MacroAssembler::mov_metadata(Register dst, Metadata* obj) { 689 mov_literal64(dst, (intptr_t)obj, metadata_Relocation::spec_for_immediate()); 690 } 691 692 void MacroAssembler::mov_metadata(Address dst, Metadata* obj) { 693 mov_literal64(rscratch1, (intptr_t)obj, metadata_Relocation::spec_for_immediate()); 694 movq(dst, rscratch1); 695 } 696 697 void MacroAssembler::movptr(Register dst, AddressLiteral src, Register scratch) { 698 if (src.is_lval()) { 699 mov_literal64(dst, (intptr_t)src.target(), src.rspec()); 700 } else { 701 if (reachable(src)) { 702 movq(dst, as_Address(src)); 703 } else { 704 lea(scratch, src); 705 movq(dst, Address(scratch, 0)); 706 } 707 } 708 } 709 710 void MacroAssembler::movptr(ArrayAddress dst, Register src) { 711 movq(as_Address(dst), src); 712 } 713 714 void MacroAssembler::movptr(Register dst, ArrayAddress src) { 715 movq(dst, as_Address(src)); 716 } 717 718 // src should NEVER be a real pointer. Use AddressLiteral for true pointers 719 void MacroAssembler::movptr(Address dst, intptr_t src) { 720 mov64(rscratch1, src); 721 movq(dst, rscratch1); 722 } 723 724 // These are mostly for initializing NULL 725 void MacroAssembler::movptr(Address dst, int32_t src) { 726 movslq(dst, src); 727 } 728 729 void MacroAssembler::movptr(Register dst, int32_t src) { 730 mov64(dst, (intptr_t)src); 731 } 732 733 void MacroAssembler::pushoop(jobject obj) { 734 movoop(rscratch1, obj); 735 push(rscratch1); 736 } 737 738 void MacroAssembler::pushklass(Metadata* obj) { 739 mov_metadata(rscratch1, obj); 740 push(rscratch1); 741 } 742 743 void MacroAssembler::pushptr(AddressLiteral src) { 744 lea(rscratch1, src); 745 if (src.is_lval()) { 746 push(rscratch1); 747 } else { 748 pushq(Address(rscratch1, 0)); 749 } 750 } 751 752 void MacroAssembler::reset_last_Java_frame(bool clear_fp, 753 bool clear_pc) { 754 // we must set sp to zero to clear frame 755 movptr(Address(r15_thread, JavaThread::last_Java_sp_offset()), NULL_WORD); 756 // must clear fp, so that compiled frames are not confused; it is 757 // possible that we need it only for debugging 758 if (clear_fp) { 759 movptr(Address(r15_thread, JavaThread::last_Java_fp_offset()), NULL_WORD); 760 } 761 762 if (clear_pc) { 763 movptr(Address(r15_thread, JavaThread::last_Java_pc_offset()), NULL_WORD); 764 } 765 } 766 767 void MacroAssembler::set_last_Java_frame(Register last_java_sp, 768 Register last_java_fp, 769 address last_java_pc) { 770 // determine last_java_sp register 771 if (!last_java_sp->is_valid()) { 772 last_java_sp = rsp; 773 } 774 775 // last_java_fp is optional 776 if (last_java_fp->is_valid()) { 777 movptr(Address(r15_thread, JavaThread::last_Java_fp_offset()), 778 last_java_fp); 779 } 780 781 // last_java_pc is optional 782 if (last_java_pc != NULL) { 783 Address java_pc(r15_thread, 784 JavaThread::frame_anchor_offset() + JavaFrameAnchor::last_Java_pc_offset()); 785 lea(rscratch1, InternalAddress(last_java_pc)); 786 movptr(java_pc, rscratch1); 787 } 788 789 movptr(Address(r15_thread, JavaThread::last_Java_sp_offset()), last_java_sp); 790 } 791 792 static void pass_arg0(MacroAssembler* masm, Register arg) { 793 if (c_rarg0 != arg ) { 794 masm->mov(c_rarg0, arg); 795 } 796 } 797 798 static void pass_arg1(MacroAssembler* masm, Register arg) { 799 if (c_rarg1 != arg ) { 800 masm->mov(c_rarg1, arg); 801 } 802 } 803 804 static void pass_arg2(MacroAssembler* masm, Register arg) { 805 if (c_rarg2 != arg ) { 806 masm->mov(c_rarg2, arg); 807 } 808 } 809 810 static void pass_arg3(MacroAssembler* masm, Register arg) { 811 if (c_rarg3 != arg ) { 812 masm->mov(c_rarg3, arg); 813 } 814 } 815 816 void MacroAssembler::stop(const char* msg) { 817 address rip = pc(); 818 pusha(); // get regs on stack 819 lea(c_rarg0, ExternalAddress((address) msg)); 820 lea(c_rarg1, InternalAddress(rip)); 821 movq(c_rarg2, rsp); // pass pointer to regs array 822 andq(rsp, -16); // align stack as required by ABI 823 call(RuntimeAddress(CAST_FROM_FN_PTR(address, MacroAssembler::debug64))); 824 hlt(); 825 } 826 827 void MacroAssembler::warn(const char* msg) { 828 push(rbp); 829 movq(rbp, rsp); 830 andq(rsp, -16); // align stack as required by push_CPU_state and call 831 push_CPU_state(); // keeps alignment at 16 bytes 832 lea(c_rarg0, ExternalAddress((address) msg)); 833 call_VM_leaf(CAST_FROM_FN_PTR(address, warning), c_rarg0); 834 pop_CPU_state(); 835 mov(rsp, rbp); 836 pop(rbp); 837 } 838 839 void MacroAssembler::print_state() { 840 address rip = pc(); 841 pusha(); // get regs on stack 842 push(rbp); 843 movq(rbp, rsp); 844 andq(rsp, -16); // align stack as required by push_CPU_state and call 845 push_CPU_state(); // keeps alignment at 16 bytes 846 847 lea(c_rarg0, InternalAddress(rip)); 848 lea(c_rarg1, Address(rbp, wordSize)); // pass pointer to regs array 849 call_VM_leaf(CAST_FROM_FN_PTR(address, MacroAssembler::print_state64), c_rarg0, c_rarg1); 850 851 pop_CPU_state(); 852 mov(rsp, rbp); 853 pop(rbp); 854 popa(); 855 } 856 857 #ifndef PRODUCT 858 extern "C" void findpc(intptr_t x); 859 #endif 860 861 void MacroAssembler::debug64(char* msg, int64_t pc, int64_t regs[]) { 862 // In order to get locks to work, we need to fake a in_VM state 863 if (ShowMessageBoxOnError) { 864 JavaThread* thread = JavaThread::current(); 865 JavaThreadState saved_state = thread->thread_state(); 866 thread->set_thread_state(_thread_in_vm); 867 #ifndef PRODUCT 868 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) { 869 ttyLocker ttyl; 870 BytecodeCounter::print(); 871 } 872 #endif 873 // To see where a verify_oop failed, get $ebx+40/X for this frame. 874 // XXX correct this offset for amd64 875 // This is the value of eip which points to where verify_oop will return. 876 if (os::message_box(msg, "Execution stopped, print registers?")) { 877 print_state64(pc, regs); 878 BREAKPOINT; 879 assert(false, "start up GDB"); 880 } 881 ThreadStateTransition::transition(thread, _thread_in_vm, saved_state); 882 } else { 883 ttyLocker ttyl; 884 ::tty->print_cr("=============== DEBUG MESSAGE: %s ================\n", 885 msg); 886 assert(false, err_msg("DEBUG MESSAGE: %s", msg)); 887 } 888 } 889 890 void MacroAssembler::print_state64(int64_t pc, int64_t regs[]) { 891 ttyLocker ttyl; 892 FlagSetting fs(Debugging, true); 893 tty->print_cr("rip = 0x%016lx", pc); 894 #ifndef PRODUCT 895 tty->cr(); 896 findpc(pc); 897 tty->cr(); 898 #endif 899 #define PRINT_REG(rax, value) \ 900 { tty->print("%s = ", #rax); os::print_location(tty, value); } 901 PRINT_REG(rax, regs[15]); 902 PRINT_REG(rbx, regs[12]); 903 PRINT_REG(rcx, regs[14]); 904 PRINT_REG(rdx, regs[13]); 905 PRINT_REG(rdi, regs[8]); 906 PRINT_REG(rsi, regs[9]); 907 PRINT_REG(rbp, regs[10]); 908 PRINT_REG(rsp, regs[11]); 909 PRINT_REG(r8 , regs[7]); 910 PRINT_REG(r9 , regs[6]); 911 PRINT_REG(r10, regs[5]); 912 PRINT_REG(r11, regs[4]); 913 PRINT_REG(r12, regs[3]); 914 PRINT_REG(r13, regs[2]); 915 PRINT_REG(r14, regs[1]); 916 PRINT_REG(r15, regs[0]); 917 #undef PRINT_REG 918 // Print some words near top of staack. 919 int64_t* rsp = (int64_t*) regs[11]; 920 int64_t* dump_sp = rsp; 921 for (int col1 = 0; col1 < 8; col1++) { 922 tty->print("(rsp+0x%03x) 0x%016lx: ", (int)((intptr_t)dump_sp - (intptr_t)rsp), (int64_t)dump_sp); 923 os::print_location(tty, *dump_sp++); 924 } 925 for (int row = 0; row < 25; row++) { 926 tty->print("(rsp+0x%03x) 0x%016lx: ", (int)((intptr_t)dump_sp - (intptr_t)rsp), (int64_t)dump_sp); 927 for (int col = 0; col < 4; col++) { 928 tty->print(" 0x%016lx", *dump_sp++); 929 } 930 tty->cr(); 931 } 932 // Print some instructions around pc: 933 Disassembler::decode((address)pc-64, (address)pc); 934 tty->print_cr("--------"); 935 Disassembler::decode((address)pc, (address)pc+32); 936 } 937 938 #endif // _LP64 939 940 // Now versions that are common to 32/64 bit 941 942 void MacroAssembler::addptr(Register dst, int32_t imm32) { 943 LP64_ONLY(addq(dst, imm32)) NOT_LP64(addl(dst, imm32)); 944 } 945 946 void MacroAssembler::addptr(Register dst, Register src) { 947 LP64_ONLY(addq(dst, src)) NOT_LP64(addl(dst, src)); 948 } 949 950 void MacroAssembler::addptr(Address dst, Register src) { 951 LP64_ONLY(addq(dst, src)) NOT_LP64(addl(dst, src)); 952 } 953 954 void MacroAssembler::addsd(XMMRegister dst, AddressLiteral src) { 955 if (reachable(src)) { 956 Assembler::addsd(dst, as_Address(src)); 957 } else { 958 lea(rscratch1, src); 959 Assembler::addsd(dst, Address(rscratch1, 0)); 960 } 961 } 962 963 void MacroAssembler::addss(XMMRegister dst, AddressLiteral src) { 964 if (reachable(src)) { 965 addss(dst, as_Address(src)); 966 } else { 967 lea(rscratch1, src); 968 addss(dst, Address(rscratch1, 0)); 969 } 970 } 971 972 void MacroAssembler::align(int modulus) { 973 if (offset() % modulus != 0) { 974 nop(modulus - (offset() % modulus)); 975 } 976 } 977 978 void MacroAssembler::andpd(XMMRegister dst, AddressLiteral src) { 979 // Used in sign-masking with aligned address. 980 assert((UseAVX > 0) || (((intptr_t)src.target() & 15) == 0), "SSE mode requires address alignment 16 bytes"); 981 if (reachable(src)) { 982 Assembler::andpd(dst, as_Address(src)); 983 } else { 984 lea(rscratch1, src); 985 Assembler::andpd(dst, Address(rscratch1, 0)); 986 } 987 } 988 989 void MacroAssembler::andps(XMMRegister dst, AddressLiteral src) { 990 // Used in sign-masking with aligned address. 991 assert((UseAVX > 0) || (((intptr_t)src.target() & 15) == 0), "SSE mode requires address alignment 16 bytes"); 992 if (reachable(src)) { 993 Assembler::andps(dst, as_Address(src)); 994 } else { 995 lea(rscratch1, src); 996 Assembler::andps(dst, Address(rscratch1, 0)); 997 } 998 } 999 1000 void MacroAssembler::andptr(Register dst, int32_t imm32) { 1001 LP64_ONLY(andq(dst, imm32)) NOT_LP64(andl(dst, imm32)); 1002 } 1003 1004 void MacroAssembler::atomic_incl(Address counter_addr) { 1005 if (os::is_MP()) 1006 lock(); 1007 incrementl(counter_addr); 1008 } 1009 1010 void MacroAssembler::atomic_incl(AddressLiteral counter_addr, Register scr) { 1011 if (reachable(counter_addr)) { 1012 atomic_incl(as_Address(counter_addr)); 1013 } else { 1014 lea(scr, counter_addr); 1015 atomic_incl(Address(scr, 0)); 1016 } 1017 } 1018 1019 #ifdef _LP64 1020 void MacroAssembler::atomic_incq(Address counter_addr) { 1021 if (os::is_MP()) 1022 lock(); 1023 incrementq(counter_addr); 1024 } 1025 1026 void MacroAssembler::atomic_incq(AddressLiteral counter_addr, Register scr) { 1027 if (reachable(counter_addr)) { 1028 atomic_incq(as_Address(counter_addr)); 1029 } else { 1030 lea(scr, counter_addr); 1031 atomic_incq(Address(scr, 0)); 1032 } 1033 } 1034 #endif 1035 1036 // Writes to stack successive pages until offset reached to check for 1037 // stack overflow + shadow pages. This clobbers tmp. 1038 void MacroAssembler::bang_stack_size(Register size, Register tmp) { 1039 movptr(tmp, rsp); 1040 // Bang stack for total size given plus shadow page size. 1041 // Bang one page at a time because large size can bang beyond yellow and 1042 // red zones. 1043 Label loop; 1044 bind(loop); 1045 movl(Address(tmp, (-os::vm_page_size())), size ); 1046 subptr(tmp, os::vm_page_size()); 1047 subl(size, os::vm_page_size()); 1048 jcc(Assembler::greater, loop); 1049 1050 // Bang down shadow pages too. 1051 // At this point, (tmp-0) is the last address touched, so don't 1052 // touch it again. (It was touched as (tmp-pagesize) but then tmp 1053 // was post-decremented.) Skip this address by starting at i=1, and 1054 // touch a few more pages below. N.B. It is important to touch all 1055 // the way down to and including i=StackShadowPages. 1056 for (int i = 1; i < StackShadowPages; i++) { 1057 // this could be any sized move but this is can be a debugging crumb 1058 // so the bigger the better. 1059 movptr(Address(tmp, (-i*os::vm_page_size())), size ); 1060 } 1061 } 1062 1063 int MacroAssembler::biased_locking_enter(Register lock_reg, 1064 Register obj_reg, 1065 Register swap_reg, 1066 Register tmp_reg, 1067 bool swap_reg_contains_mark, 1068 Label& done, 1069 Label* slow_case, 1070 BiasedLockingCounters* counters) { 1071 assert(UseBiasedLocking, "why call this otherwise?"); 1072 assert(swap_reg == rax, "swap_reg must be rax for cmpxchgq"); 1073 assert(tmp_reg != noreg, "tmp_reg must be supplied"); 1074 assert_different_registers(lock_reg, obj_reg, swap_reg, tmp_reg); 1075 assert(markOopDesc::age_shift == markOopDesc::lock_bits + markOopDesc::biased_lock_bits, "biased locking makes assumptions about bit layout"); 1076 Address mark_addr (obj_reg, oopDesc::mark_offset_in_bytes()); 1077 Address saved_mark_addr(lock_reg, 0); 1078 1079 if (PrintBiasedLockingStatistics && counters == NULL) { 1080 counters = BiasedLocking::counters(); 1081 } 1082 // Biased locking 1083 // See whether the lock is currently biased toward our thread and 1084 // whether the epoch is still valid 1085 // Note that the runtime guarantees sufficient alignment of JavaThread 1086 // pointers to allow age to be placed into low bits 1087 // First check to see whether biasing is even enabled for this object 1088 Label cas_label; 1089 int null_check_offset = -1; 1090 if (!swap_reg_contains_mark) { 1091 null_check_offset = offset(); 1092 movptr(swap_reg, mark_addr); 1093 } 1094 movptr(tmp_reg, swap_reg); 1095 andptr(tmp_reg, markOopDesc::biased_lock_mask_in_place); 1096 cmpptr(tmp_reg, markOopDesc::biased_lock_pattern); 1097 jcc(Assembler::notEqual, cas_label); 1098 // The bias pattern is present in the object's header. Need to check 1099 // whether the bias owner and the epoch are both still current. 1100 #ifndef _LP64 1101 // Note that because there is no current thread register on x86_32 we 1102 // need to store off the mark word we read out of the object to 1103 // avoid reloading it and needing to recheck invariants below. This 1104 // store is unfortunate but it makes the overall code shorter and 1105 // simpler. 1106 movptr(saved_mark_addr, swap_reg); 1107 #endif 1108 if (swap_reg_contains_mark) { 1109 null_check_offset = offset(); 1110 } 1111 load_prototype_header(tmp_reg, obj_reg); 1112 #ifdef _LP64 1113 orptr(tmp_reg, r15_thread); 1114 xorptr(tmp_reg, swap_reg); 1115 Register header_reg = tmp_reg; 1116 #else 1117 xorptr(tmp_reg, swap_reg); 1118 get_thread(swap_reg); 1119 xorptr(swap_reg, tmp_reg); 1120 Register header_reg = swap_reg; 1121 #endif 1122 andptr(header_reg, ~((int) markOopDesc::age_mask_in_place)); 1123 if (counters != NULL) { 1124 cond_inc32(Assembler::zero, 1125 ExternalAddress((address) counters->biased_lock_entry_count_addr())); 1126 } 1127 jcc(Assembler::equal, done); 1128 1129 Label try_revoke_bias; 1130 Label try_rebias; 1131 1132 // At this point we know that the header has the bias pattern and 1133 // that we are not the bias owner in the current epoch. We need to 1134 // figure out more details about the state of the header in order to 1135 // know what operations can be legally performed on the object's 1136 // header. 1137 1138 // If the low three bits in the xor result aren't clear, that means 1139 // the prototype header is no longer biased and we have to revoke 1140 // the bias on this object. 1141 testptr(header_reg, markOopDesc::biased_lock_mask_in_place); 1142 jccb(Assembler::notZero, try_revoke_bias); 1143 1144 // Biasing is still enabled for this data type. See whether the 1145 // epoch of the current bias is still valid, meaning that the epoch 1146 // bits of the mark word are equal to the epoch bits of the 1147 // prototype header. (Note that the prototype header's epoch bits 1148 // only change at a safepoint.) If not, attempt to rebias the object 1149 // toward the current thread. Note that we must be absolutely sure 1150 // that the current epoch is invalid in order to do this because 1151 // otherwise the manipulations it performs on the mark word are 1152 // illegal. 1153 testptr(header_reg, markOopDesc::epoch_mask_in_place); 1154 jccb(Assembler::notZero, try_rebias); 1155 1156 // The epoch of the current bias is still valid but we know nothing 1157 // about the owner; it might be set or it might be clear. Try to 1158 // acquire the bias of the object using an atomic operation. If this 1159 // fails we will go in to the runtime to revoke the object's bias. 1160 // Note that we first construct the presumed unbiased header so we 1161 // don't accidentally blow away another thread's valid bias. 1162 NOT_LP64( movptr(swap_reg, saved_mark_addr); ) 1163 andptr(swap_reg, 1164 markOopDesc::biased_lock_mask_in_place | markOopDesc::age_mask_in_place | markOopDesc::epoch_mask_in_place); 1165 #ifdef _LP64 1166 movptr(tmp_reg, swap_reg); 1167 orptr(tmp_reg, r15_thread); 1168 #else 1169 get_thread(tmp_reg); 1170 orptr(tmp_reg, swap_reg); 1171 #endif 1172 if (os::is_MP()) { 1173 lock(); 1174 } 1175 cmpxchgptr(tmp_reg, mark_addr); // compare tmp_reg and swap_reg 1176 // If the biasing toward our thread failed, this means that 1177 // another thread succeeded in biasing it toward itself and we 1178 // need to revoke that bias. The revocation will occur in the 1179 // interpreter runtime in the slow case. 1180 if (counters != NULL) { 1181 cond_inc32(Assembler::zero, 1182 ExternalAddress((address) counters->anonymously_biased_lock_entry_count_addr())); 1183 } 1184 if (slow_case != NULL) { 1185 jcc(Assembler::notZero, *slow_case); 1186 } 1187 jmp(done); 1188 1189 bind(try_rebias); 1190 // At this point we know the epoch has expired, meaning that the 1191 // current "bias owner", if any, is actually invalid. Under these 1192 // circumstances _only_, we are allowed to use the current header's 1193 // value as the comparison value when doing the cas to acquire the 1194 // bias in the current epoch. In other words, we allow transfer of 1195 // the bias from one thread to another directly in this situation. 1196 // 1197 // FIXME: due to a lack of registers we currently blow away the age 1198 // bits in this situation. Should attempt to preserve them. 1199 load_prototype_header(tmp_reg, obj_reg); 1200 #ifdef _LP64 1201 orptr(tmp_reg, r15_thread); 1202 #else 1203 get_thread(swap_reg); 1204 orptr(tmp_reg, swap_reg); 1205 movptr(swap_reg, saved_mark_addr); 1206 #endif 1207 if (os::is_MP()) { 1208 lock(); 1209 } 1210 cmpxchgptr(tmp_reg, mark_addr); // compare tmp_reg and swap_reg 1211 // If the biasing toward our thread failed, then another thread 1212 // succeeded in biasing it toward itself and we need to revoke that 1213 // bias. The revocation will occur in the runtime in the slow case. 1214 if (counters != NULL) { 1215 cond_inc32(Assembler::zero, 1216 ExternalAddress((address) counters->rebiased_lock_entry_count_addr())); 1217 } 1218 if (slow_case != NULL) { 1219 jcc(Assembler::notZero, *slow_case); 1220 } 1221 jmp(done); 1222 1223 bind(try_revoke_bias); 1224 // The prototype mark in the klass doesn't have the bias bit set any 1225 // more, indicating that objects of this data type are not supposed 1226 // to be biased any more. We are going to try to reset the mark of 1227 // this object to the prototype value and fall through to the 1228 // CAS-based locking scheme. Note that if our CAS fails, it means 1229 // that another thread raced us for the privilege of revoking the 1230 // bias of this particular object, so it's okay to continue in the 1231 // normal locking code. 1232 // 1233 // FIXME: due to a lack of registers we currently blow away the age 1234 // bits in this situation. Should attempt to preserve them. 1235 NOT_LP64( movptr(swap_reg, saved_mark_addr); ) 1236 load_prototype_header(tmp_reg, obj_reg); 1237 if (os::is_MP()) { 1238 lock(); 1239 } 1240 cmpxchgptr(tmp_reg, mark_addr); // compare tmp_reg and swap_reg 1241 // Fall through to the normal CAS-based lock, because no matter what 1242 // the result of the above CAS, some thread must have succeeded in 1243 // removing the bias bit from the object's header. 1244 if (counters != NULL) { 1245 cond_inc32(Assembler::zero, 1246 ExternalAddress((address) counters->revoked_lock_entry_count_addr())); 1247 } 1248 1249 bind(cas_label); 1250 1251 return null_check_offset; 1252 } 1253 1254 void MacroAssembler::biased_locking_exit(Register obj_reg, Register temp_reg, Label& done) { 1255 assert(UseBiasedLocking, "why call this otherwise?"); 1256 1257 // Check for biased locking unlock case, which is a no-op 1258 // Note: we do not have to check the thread ID for two reasons. 1259 // First, the interpreter checks for IllegalMonitorStateException at 1260 // a higher level. Second, if the bias was revoked while we held the 1261 // lock, the object could not be rebiased toward another thread, so 1262 // the bias bit would be clear. 1263 movptr(temp_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes())); 1264 andptr(temp_reg, markOopDesc::biased_lock_mask_in_place); 1265 cmpptr(temp_reg, markOopDesc::biased_lock_pattern); 1266 jcc(Assembler::equal, done); 1267 } 1268 1269 #ifdef COMPILER2 1270 1271 #if INCLUDE_RTM_OPT 1272 1273 // Update rtm_counters based on abort status 1274 // input: abort_status 1275 // rtm_counters (RTMLockingCounters*) 1276 // flags are killed 1277 void MacroAssembler::rtm_counters_update(Register abort_status, Register rtm_counters) { 1278 1279 atomic_incptr(Address(rtm_counters, RTMLockingCounters::abort_count_offset())); 1280 if (PrintPreciseRTMLockingStatistics) { 1281 for (int i = 0; i < RTMLockingCounters::ABORT_STATUS_LIMIT; i++) { 1282 Label check_abort; 1283 testl(abort_status, (1<<i)); 1284 jccb(Assembler::equal, check_abort); 1285 atomic_incptr(Address(rtm_counters, RTMLockingCounters::abortX_count_offset() + (i * sizeof(uintx)))); 1286 bind(check_abort); 1287 } 1288 } 1289 } 1290 1291 // Branch if (random & (count-1) != 0), count is 2^n 1292 // tmp, scr and flags are killed 1293 void MacroAssembler::branch_on_random_using_rdtsc(Register tmp, Register scr, int count, Label& brLabel) { 1294 assert(tmp == rax, ""); 1295 assert(scr == rdx, ""); 1296 rdtsc(); // modifies EDX:EAX 1297 andptr(tmp, count-1); 1298 jccb(Assembler::notZero, brLabel); 1299 } 1300 1301 // Perform abort ratio calculation, set no_rtm bit if high ratio 1302 // input: rtm_counters_Reg (RTMLockingCounters* address) 1303 // tmpReg, rtm_counters_Reg and flags are killed 1304 void MacroAssembler::rtm_abort_ratio_calculation(Register tmpReg, 1305 Register rtm_counters_Reg, 1306 RTMLockingCounters* rtm_counters, 1307 Metadata* method_data) { 1308 Label L_done, L_check_always_rtm1, L_check_always_rtm2; 1309 1310 if (RTMLockingCalculationDelay > 0) { 1311 // Delay calculation 1312 movptr(tmpReg, ExternalAddress((address) RTMLockingCounters::rtm_calculation_flag_addr()), tmpReg); 1313 testptr(tmpReg, tmpReg); 1314 jccb(Assembler::equal, L_done); 1315 } 1316 // Abort ratio calculation only if abort_count > RTMAbortThreshold 1317 // Aborted transactions = abort_count * 100 1318 // All transactions = total_count * RTMTotalCountIncrRate 1319 // Set no_rtm bit if (Aborted transactions >= All transactions * RTMAbortRatio) 1320 1321 movptr(tmpReg, Address(rtm_counters_Reg, RTMLockingCounters::abort_count_offset())); 1322 cmpptr(tmpReg, RTMAbortThreshold); 1323 jccb(Assembler::below, L_check_always_rtm2); 1324 imulptr(tmpReg, tmpReg, 100); 1325 1326 Register scrReg = rtm_counters_Reg; 1327 movptr(scrReg, Address(rtm_counters_Reg, RTMLockingCounters::total_count_offset())); 1328 imulptr(scrReg, scrReg, RTMTotalCountIncrRate); 1329 imulptr(scrReg, scrReg, RTMAbortRatio); 1330 cmpptr(tmpReg, scrReg); 1331 jccb(Assembler::below, L_check_always_rtm1); 1332 if (method_data != NULL) { 1333 // set rtm_state to "no rtm" in MDO 1334 mov_metadata(tmpReg, method_data); 1335 if (os::is_MP()) { 1336 lock(); 1337 } 1338 orl(Address(tmpReg, MethodData::rtm_state_offset_in_bytes()), NoRTM); 1339 } 1340 jmpb(L_done); 1341 bind(L_check_always_rtm1); 1342 // Reload RTMLockingCounters* address 1343 lea(rtm_counters_Reg, ExternalAddress((address)rtm_counters)); 1344 bind(L_check_always_rtm2); 1345 movptr(tmpReg, Address(rtm_counters_Reg, RTMLockingCounters::total_count_offset())); 1346 cmpptr(tmpReg, RTMLockingThreshold / RTMTotalCountIncrRate); 1347 jccb(Assembler::below, L_done); 1348 if (method_data != NULL) { 1349 // set rtm_state to "always rtm" in MDO 1350 mov_metadata(tmpReg, method_data); 1351 if (os::is_MP()) { 1352 lock(); 1353 } 1354 orl(Address(tmpReg, MethodData::rtm_state_offset_in_bytes()), UseRTM); 1355 } 1356 bind(L_done); 1357 } 1358 1359 // Update counters and perform abort ratio calculation 1360 // input: abort_status_Reg 1361 // rtm_counters_Reg, flags are killed 1362 void MacroAssembler::rtm_profiling(Register abort_status_Reg, 1363 Register rtm_counters_Reg, 1364 RTMLockingCounters* rtm_counters, 1365 Metadata* method_data, 1366 bool profile_rtm) { 1367 1368 assert(rtm_counters != NULL, "should not be NULL when profiling RTM"); 1369 // update rtm counters based on rax value at abort 1370 // reads abort_status_Reg, updates flags 1371 lea(rtm_counters_Reg, ExternalAddress((address)rtm_counters)); 1372 rtm_counters_update(abort_status_Reg, rtm_counters_Reg); 1373 if (profile_rtm) { 1374 // Save abort status because abort_status_Reg is used by following code. 1375 if (RTMRetryCount > 0) { 1376 push(abort_status_Reg); 1377 } 1378 assert(rtm_counters != NULL, "should not be NULL when profiling RTM"); 1379 rtm_abort_ratio_calculation(abort_status_Reg, rtm_counters_Reg, rtm_counters, method_data); 1380 // restore abort status 1381 if (RTMRetryCount > 0) { 1382 pop(abort_status_Reg); 1383 } 1384 } 1385 } 1386 1387 // Retry on abort if abort's status is 0x6: can retry (0x2) | memory conflict (0x4) 1388 // inputs: retry_count_Reg 1389 // : abort_status_Reg 1390 // output: retry_count_Reg decremented by 1 1391 // flags are killed 1392 void MacroAssembler::rtm_retry_lock_on_abort(Register retry_count_Reg, Register abort_status_Reg, Label& retryLabel) { 1393 Label doneRetry; 1394 assert(abort_status_Reg == rax, ""); 1395 // The abort reason bits are in eax (see all states in rtmLocking.hpp) 1396 // 0x6 = conflict on which we can retry (0x2) | memory conflict (0x4) 1397 // if reason is in 0x6 and retry count != 0 then retry 1398 andptr(abort_status_Reg, 0x6); 1399 jccb(Assembler::zero, doneRetry); 1400 testl(retry_count_Reg, retry_count_Reg); 1401 jccb(Assembler::zero, doneRetry); 1402 pause(); 1403 decrementl(retry_count_Reg); 1404 jmp(retryLabel); 1405 bind(doneRetry); 1406 } 1407 1408 // Spin and retry if lock is busy, 1409 // inputs: box_Reg (monitor address) 1410 // : retry_count_Reg 1411 // output: retry_count_Reg decremented by 1 1412 // : clear z flag if retry count exceeded 1413 // tmp_Reg, scr_Reg, flags are killed 1414 void MacroAssembler::rtm_retry_lock_on_busy(Register retry_count_Reg, Register box_Reg, 1415 Register tmp_Reg, Register scr_Reg, Label& retryLabel) { 1416 Label SpinLoop, SpinExit, doneRetry; 1417 int owner_offset = OM_OFFSET_NO_MONITOR_VALUE_TAG(owner); 1418 1419 testl(retry_count_Reg, retry_count_Reg); 1420 jccb(Assembler::zero, doneRetry); 1421 decrementl(retry_count_Reg); 1422 movptr(scr_Reg, RTMSpinLoopCount); 1423 1424 bind(SpinLoop); 1425 pause(); 1426 decrementl(scr_Reg); 1427 jccb(Assembler::lessEqual, SpinExit); 1428 movptr(tmp_Reg, Address(box_Reg, owner_offset)); 1429 testptr(tmp_Reg, tmp_Reg); 1430 jccb(Assembler::notZero, SpinLoop); 1431 1432 bind(SpinExit); 1433 jmp(retryLabel); 1434 bind(doneRetry); 1435 incrementl(retry_count_Reg); // clear z flag 1436 } 1437 1438 // Use RTM for normal stack locks 1439 // Input: objReg (object to lock) 1440 void MacroAssembler::rtm_stack_locking(Register objReg, Register tmpReg, Register scrReg, 1441 Register retry_on_abort_count_Reg, 1442 RTMLockingCounters* stack_rtm_counters, 1443 Metadata* method_data, bool profile_rtm, 1444 Label& DONE_LABEL, Label& IsInflated) { 1445 assert(UseRTMForStackLocks, "why call this otherwise?"); 1446 assert(!UseBiasedLocking, "Biased locking is not supported with RTM locking"); 1447 assert(tmpReg == rax, ""); 1448 assert(scrReg == rdx, ""); 1449 Label L_rtm_retry, L_decrement_retry, L_on_abort; 1450 1451 if (RTMRetryCount > 0) { 1452 movl(retry_on_abort_count_Reg, RTMRetryCount); // Retry on abort 1453 bind(L_rtm_retry); 1454 } 1455 movptr(tmpReg, Address(objReg, 0)); 1456 testptr(tmpReg, markOopDesc::monitor_value); // inflated vs stack-locked|neutral|biased 1457 jcc(Assembler::notZero, IsInflated); 1458 1459 if (PrintPreciseRTMLockingStatistics || profile_rtm) { 1460 Label L_noincrement; 1461 if (RTMTotalCountIncrRate > 1) { 1462 // tmpReg, scrReg and flags are killed 1463 branch_on_random_using_rdtsc(tmpReg, scrReg, (int)RTMTotalCountIncrRate, L_noincrement); 1464 } 1465 assert(stack_rtm_counters != NULL, "should not be NULL when profiling RTM"); 1466 atomic_incptr(ExternalAddress((address)stack_rtm_counters->total_count_addr()), scrReg); 1467 bind(L_noincrement); 1468 } 1469 xbegin(L_on_abort); 1470 movptr(tmpReg, Address(objReg, 0)); // fetch markword 1471 andptr(tmpReg, markOopDesc::biased_lock_mask_in_place); // look at 3 lock bits 1472 cmpptr(tmpReg, markOopDesc::unlocked_value); // bits = 001 unlocked 1473 jcc(Assembler::equal, DONE_LABEL); // all done if unlocked 1474 1475 Register abort_status_Reg = tmpReg; // status of abort is stored in RAX 1476 if (UseRTMXendForLockBusy) { 1477 xend(); 1478 movptr(abort_status_Reg, 0x2); // Set the abort status to 2 (so we can retry) 1479 jmp(L_decrement_retry); 1480 } 1481 else { 1482 xabort(0); 1483 } 1484 bind(L_on_abort); 1485 if (PrintPreciseRTMLockingStatistics || profile_rtm) { 1486 rtm_profiling(abort_status_Reg, scrReg, stack_rtm_counters, method_data, profile_rtm); 1487 } 1488 bind(L_decrement_retry); 1489 if (RTMRetryCount > 0) { 1490 // retry on lock abort if abort status is 'can retry' (0x2) or 'memory conflict' (0x4) 1491 rtm_retry_lock_on_abort(retry_on_abort_count_Reg, abort_status_Reg, L_rtm_retry); 1492 } 1493 } 1494 1495 // Use RTM for inflating locks 1496 // inputs: objReg (object to lock) 1497 // boxReg (on-stack box address (displaced header location) - KILLED) 1498 // tmpReg (ObjectMonitor address + markOopDesc::monitor_value) 1499 void MacroAssembler::rtm_inflated_locking(Register objReg, Register boxReg, Register tmpReg, 1500 Register scrReg, Register retry_on_busy_count_Reg, 1501 Register retry_on_abort_count_Reg, 1502 RTMLockingCounters* rtm_counters, 1503 Metadata* method_data, bool profile_rtm, 1504 Label& DONE_LABEL) { 1505 assert(UseRTMLocking, "why call this otherwise?"); 1506 assert(tmpReg == rax, ""); 1507 assert(scrReg == rdx, ""); 1508 Label L_rtm_retry, L_decrement_retry, L_on_abort; 1509 int owner_offset = OM_OFFSET_NO_MONITOR_VALUE_TAG(owner); 1510 1511 // Without cast to int32_t a movptr will destroy r10 which is typically obj 1512 movptr(Address(boxReg, 0), (int32_t)intptr_t(markOopDesc::unused_mark())); 1513 movptr(boxReg, tmpReg); // Save ObjectMonitor address 1514 1515 if (RTMRetryCount > 0) { 1516 movl(retry_on_busy_count_Reg, RTMRetryCount); // Retry on lock busy 1517 movl(retry_on_abort_count_Reg, RTMRetryCount); // Retry on abort 1518 bind(L_rtm_retry); 1519 } 1520 if (PrintPreciseRTMLockingStatistics || profile_rtm) { 1521 Label L_noincrement; 1522 if (RTMTotalCountIncrRate > 1) { 1523 // tmpReg, scrReg and flags are killed 1524 branch_on_random_using_rdtsc(tmpReg, scrReg, (int)RTMTotalCountIncrRate, L_noincrement); 1525 } 1526 assert(rtm_counters != NULL, "should not be NULL when profiling RTM"); 1527 atomic_incptr(ExternalAddress((address)rtm_counters->total_count_addr()), scrReg); 1528 bind(L_noincrement); 1529 } 1530 xbegin(L_on_abort); 1531 movptr(tmpReg, Address(objReg, 0)); 1532 movptr(tmpReg, Address(tmpReg, owner_offset)); 1533 testptr(tmpReg, tmpReg); 1534 jcc(Assembler::zero, DONE_LABEL); 1535 if (UseRTMXendForLockBusy) { 1536 xend(); 1537 jmp(L_decrement_retry); 1538 } 1539 else { 1540 xabort(0); 1541 } 1542 bind(L_on_abort); 1543 Register abort_status_Reg = tmpReg; // status of abort is stored in RAX 1544 if (PrintPreciseRTMLockingStatistics || profile_rtm) { 1545 rtm_profiling(abort_status_Reg, scrReg, rtm_counters, method_data, profile_rtm); 1546 } 1547 if (RTMRetryCount > 0) { 1548 // retry on lock abort if abort status is 'can retry' (0x2) or 'memory conflict' (0x4) 1549 rtm_retry_lock_on_abort(retry_on_abort_count_Reg, abort_status_Reg, L_rtm_retry); 1550 } 1551 1552 movptr(tmpReg, Address(boxReg, owner_offset)) ; 1553 testptr(tmpReg, tmpReg) ; 1554 jccb(Assembler::notZero, L_decrement_retry) ; 1555 1556 // Appears unlocked - try to swing _owner from null to non-null. 1557 // Invariant: tmpReg == 0. tmpReg is EAX which is the implicit cmpxchg comparand. 1558 #ifdef _LP64 1559 Register threadReg = r15_thread; 1560 #else 1561 get_thread(scrReg); 1562 Register threadReg = scrReg; 1563 #endif 1564 if (os::is_MP()) { 1565 lock(); 1566 } 1567 cmpxchgptr(threadReg, Address(boxReg, owner_offset)); // Updates tmpReg 1568 1569 if (RTMRetryCount > 0) { 1570 // success done else retry 1571 jccb(Assembler::equal, DONE_LABEL) ; 1572 bind(L_decrement_retry); 1573 // Spin and retry if lock is busy. 1574 rtm_retry_lock_on_busy(retry_on_busy_count_Reg, boxReg, tmpReg, scrReg, L_rtm_retry); 1575 } 1576 else { 1577 bind(L_decrement_retry); 1578 } 1579 } 1580 1581 #endif // INCLUDE_RTM_OPT 1582 1583 // Fast_Lock and Fast_Unlock used by C2 1584 1585 // Because the transitions from emitted code to the runtime 1586 // monitorenter/exit helper stubs are so slow it's critical that 1587 // we inline both the stack-locking fast-path and the inflated fast path. 1588 // 1589 // See also: cmpFastLock and cmpFastUnlock. 1590 // 1591 // What follows is a specialized inline transliteration of the code 1592 // in slow_enter() and slow_exit(). If we're concerned about I$ bloat 1593 // another option would be to emit TrySlowEnter and TrySlowExit methods 1594 // at startup-time. These methods would accept arguments as 1595 // (rax,=Obj, rbx=Self, rcx=box, rdx=Scratch) and return success-failure 1596 // indications in the icc.ZFlag. Fast_Lock and Fast_Unlock would simply 1597 // marshal the arguments and emit calls to TrySlowEnter and TrySlowExit. 1598 // In practice, however, the # of lock sites is bounded and is usually small. 1599 // Besides the call overhead, TrySlowEnter and TrySlowExit might suffer 1600 // if the processor uses simple bimodal branch predictors keyed by EIP 1601 // Since the helper routines would be called from multiple synchronization 1602 // sites. 1603 // 1604 // An even better approach would be write "MonitorEnter()" and "MonitorExit()" 1605 // in java - using j.u.c and unsafe - and just bind the lock and unlock sites 1606 // to those specialized methods. That'd give us a mostly platform-independent 1607 // implementation that the JITs could optimize and inline at their pleasure. 1608 // Done correctly, the only time we'd need to cross to native could would be 1609 // to park() or unpark() threads. We'd also need a few more unsafe operators 1610 // to (a) prevent compiler-JIT reordering of non-volatile accesses, and 1611 // (b) explicit barriers or fence operations. 1612 // 1613 // TODO: 1614 // 1615 // * Arrange for C2 to pass "Self" into Fast_Lock and Fast_Unlock in one of the registers (scr). 1616 // This avoids manifesting the Self pointer in the Fast_Lock and Fast_Unlock terminals. 1617 // Given TLAB allocation, Self is usually manifested in a register, so passing it into 1618 // the lock operators would typically be faster than reifying Self. 1619 // 1620 // * Ideally I'd define the primitives as: 1621 // fast_lock (nax Obj, nax box, EAX tmp, nax scr) where box, tmp and scr are KILLED. 1622 // fast_unlock (nax Obj, EAX box, nax tmp) where box and tmp are KILLED 1623 // Unfortunately ADLC bugs prevent us from expressing the ideal form. 1624 // Instead, we're stuck with a rather awkward and brittle register assignments below. 1625 // Furthermore the register assignments are overconstrained, possibly resulting in 1626 // sub-optimal code near the synchronization site. 1627 // 1628 // * Eliminate the sp-proximity tests and just use "== Self" tests instead. 1629 // Alternately, use a better sp-proximity test. 1630 // 1631 // * Currently ObjectMonitor._Owner can hold either an sp value or a (THREAD *) value. 1632 // Either one is sufficient to uniquely identify a thread. 1633 // TODO: eliminate use of sp in _owner and use get_thread(tr) instead. 1634 // 1635 // * Intrinsify notify() and notifyAll() for the common cases where the 1636 // object is locked by the calling thread but the waitlist is empty. 1637 // avoid the expensive JNI call to JVM_Notify() and JVM_NotifyAll(). 1638 // 1639 // * use jccb and jmpb instead of jcc and jmp to improve code density. 1640 // But beware of excessive branch density on AMD Opterons. 1641 // 1642 // * Both Fast_Lock and Fast_Unlock set the ICC.ZF to indicate success 1643 // or failure of the fast-path. If the fast-path fails then we pass 1644 // control to the slow-path, typically in C. In Fast_Lock and 1645 // Fast_Unlock we often branch to DONE_LABEL, just to find that C2 1646 // will emit a conditional branch immediately after the node. 1647 // So we have branches to branches and lots of ICC.ZF games. 1648 // Instead, it might be better to have C2 pass a "FailureLabel" 1649 // into Fast_Lock and Fast_Unlock. In the case of success, control 1650 // will drop through the node. ICC.ZF is undefined at exit. 1651 // In the case of failure, the node will branch directly to the 1652 // FailureLabel 1653 1654 1655 // obj: object to lock 1656 // box: on-stack box address (displaced header location) - KILLED 1657 // rax,: tmp -- KILLED 1658 // scr: tmp -- KILLED 1659 void MacroAssembler::fast_lock(Register objReg, Register boxReg, Register tmpReg, 1660 Register scrReg, Register cx1Reg, Register cx2Reg, 1661 BiasedLockingCounters* counters, 1662 RTMLockingCounters* rtm_counters, 1663 RTMLockingCounters* stack_rtm_counters, 1664 Metadata* method_data, 1665 bool use_rtm, bool profile_rtm) { 1666 // Ensure the register assignents are disjoint 1667 assert(tmpReg == rax, ""); 1668 1669 if (use_rtm) { 1670 assert_different_registers(objReg, boxReg, tmpReg, scrReg, cx1Reg, cx2Reg); 1671 } else { 1672 assert(cx1Reg == noreg, ""); 1673 assert(cx2Reg == noreg, ""); 1674 assert_different_registers(objReg, boxReg, tmpReg, scrReg); 1675 } 1676 1677 if (counters != NULL) { 1678 atomic_incl(ExternalAddress((address)counters->total_entry_count_addr()), scrReg); 1679 } 1680 if (EmitSync & 1) { 1681 // set box->dhw = markOopDesc::unused_mark() 1682 // Force all sync thru slow-path: slow_enter() and slow_exit() 1683 movptr (Address(boxReg, 0), (int32_t)intptr_t(markOopDesc::unused_mark())); 1684 cmpptr (rsp, (int32_t)NULL_WORD); 1685 } else { 1686 // Possible cases that we'll encounter in fast_lock 1687 // ------------------------------------------------ 1688 // * Inflated 1689 // -- unlocked 1690 // -- Locked 1691 // = by self 1692 // = by other 1693 // * biased 1694 // -- by Self 1695 // -- by other 1696 // * neutral 1697 // * stack-locked 1698 // -- by self 1699 // = sp-proximity test hits 1700 // = sp-proximity test generates false-negative 1701 // -- by other 1702 // 1703 1704 Label IsInflated, DONE_LABEL; 1705 1706 // it's stack-locked, biased or neutral 1707 // TODO: optimize away redundant LDs of obj->mark and improve the markword triage 1708 // order to reduce the number of conditional branches in the most common cases. 1709 // Beware -- there's a subtle invariant that fetch of the markword 1710 // at [FETCH], below, will never observe a biased encoding (*101b). 1711 // If this invariant is not held we risk exclusion (safety) failure. 1712 if (UseBiasedLocking && !UseOptoBiasInlining) { 1713 biased_locking_enter(boxReg, objReg, tmpReg, scrReg, false, DONE_LABEL, NULL, counters); 1714 } 1715 1716 #if INCLUDE_RTM_OPT 1717 if (UseRTMForStackLocks && use_rtm) { 1718 rtm_stack_locking(objReg, tmpReg, scrReg, cx2Reg, 1719 stack_rtm_counters, method_data, profile_rtm, 1720 DONE_LABEL, IsInflated); 1721 } 1722 #endif // INCLUDE_RTM_OPT 1723 1724 movptr(tmpReg, Address(objReg, 0)); // [FETCH] 1725 testptr(tmpReg, markOopDesc::monitor_value); // inflated vs stack-locked|neutral|biased 1726 jccb(Assembler::notZero, IsInflated); 1727 1728 // Attempt stack-locking ... 1729 orptr (tmpReg, markOopDesc::unlocked_value); 1730 movptr(Address(boxReg, 0), tmpReg); // Anticipate successful CAS 1731 if (os::is_MP()) { 1732 lock(); 1733 } 1734 cmpxchgptr(boxReg, Address(objReg, 0)); // Updates tmpReg 1735 if (counters != NULL) { 1736 cond_inc32(Assembler::equal, 1737 ExternalAddress((address)counters->fast_path_entry_count_addr())); 1738 } 1739 jcc(Assembler::equal, DONE_LABEL); // Success 1740 1741 // Recursive locking. 1742 // The object is stack-locked: markword contains stack pointer to BasicLock. 1743 // Locked by current thread if difference with current SP is less than one page. 1744 subptr(tmpReg, rsp); 1745 // Next instruction set ZFlag == 1 (Success) if difference is less then one page. 1746 andptr(tmpReg, (int32_t) (NOT_LP64(0xFFFFF003) LP64_ONLY(7 - os::vm_page_size())) ); 1747 movptr(Address(boxReg, 0), tmpReg); 1748 if (counters != NULL) { 1749 cond_inc32(Assembler::equal, 1750 ExternalAddress((address)counters->fast_path_entry_count_addr())); 1751 } 1752 jmp(DONE_LABEL); 1753 1754 bind(IsInflated); 1755 // The object is inflated. tmpReg contains pointer to ObjectMonitor* + markOopDesc::monitor_value 1756 1757 #if INCLUDE_RTM_OPT 1758 // Use the same RTM locking code in 32- and 64-bit VM. 1759 if (use_rtm) { 1760 rtm_inflated_locking(objReg, boxReg, tmpReg, scrReg, cx1Reg, cx2Reg, 1761 rtm_counters, method_data, profile_rtm, DONE_LABEL); 1762 } else { 1763 #endif // INCLUDE_RTM_OPT 1764 1765 #ifndef _LP64 1766 // The object is inflated. 1767 1768 // boxReg refers to the on-stack BasicLock in the current frame. 1769 // We'd like to write: 1770 // set box->_displaced_header = markOopDesc::unused_mark(). Any non-0 value suffices. 1771 // This is convenient but results a ST-before-CAS penalty. The following CAS suffers 1772 // additional latency as we have another ST in the store buffer that must drain. 1773 1774 if (EmitSync & 8192) { 1775 movptr(Address(boxReg, 0), 3); // results in ST-before-CAS penalty 1776 get_thread (scrReg); 1777 movptr(boxReg, tmpReg); // consider: LEA box, [tmp-2] 1778 movptr(tmpReg, NULL_WORD); // consider: xor vs mov 1779 if (os::is_MP()) { 1780 lock(); 1781 } 1782 cmpxchgptr(scrReg, Address(boxReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); 1783 } else 1784 if ((EmitSync & 128) == 0) { // avoid ST-before-CAS 1785 // register juggle because we need tmpReg for cmpxchgptr below 1786 movptr(scrReg, boxReg); 1787 movptr(boxReg, tmpReg); // consider: LEA box, [tmp-2] 1788 1789 // Using a prefetchw helps avoid later RTS->RTO upgrades and cache probes 1790 if ((EmitSync & 2048) && VM_Version::supports_3dnow_prefetch() && os::is_MP()) { 1791 // prefetchw [eax + Offset(_owner)-2] 1792 prefetchw(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); 1793 } 1794 1795 if ((EmitSync & 64) == 0) { 1796 // Optimistic form: consider XORL tmpReg,tmpReg 1797 movptr(tmpReg, NULL_WORD); 1798 } else { 1799 // Can suffer RTS->RTO upgrades on shared or cold $ lines 1800 // Test-And-CAS instead of CAS 1801 movptr(tmpReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); // rax, = m->_owner 1802 testptr(tmpReg, tmpReg); // Locked ? 1803 jccb (Assembler::notZero, DONE_LABEL); 1804 } 1805 1806 // Appears unlocked - try to swing _owner from null to non-null. 1807 // Ideally, I'd manifest "Self" with get_thread and then attempt 1808 // to CAS the register containing Self into m->Owner. 1809 // But we don't have enough registers, so instead we can either try to CAS 1810 // rsp or the address of the box (in scr) into &m->owner. If the CAS succeeds 1811 // we later store "Self" into m->Owner. Transiently storing a stack address 1812 // (rsp or the address of the box) into m->owner is harmless. 1813 // Invariant: tmpReg == 0. tmpReg is EAX which is the implicit cmpxchg comparand. 1814 if (os::is_MP()) { 1815 lock(); 1816 } 1817 cmpxchgptr(scrReg, Address(boxReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); 1818 movptr(Address(scrReg, 0), 3); // box->_displaced_header = 3 1819 // If we weren't able to swing _owner from NULL to the BasicLock 1820 // then take the slow path. 1821 jccb (Assembler::notZero, DONE_LABEL); 1822 // update _owner from BasicLock to thread 1823 get_thread (scrReg); // beware: clobbers ICCs 1824 movptr(Address(boxReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner)), scrReg); 1825 xorptr(boxReg, boxReg); // set icc.ZFlag = 1 to indicate success 1826 1827 // If the CAS fails we can either retry or pass control to the slow-path. 1828 // We use the latter tactic. 1829 // Pass the CAS result in the icc.ZFlag into DONE_LABEL 1830 // If the CAS was successful ... 1831 // Self has acquired the lock 1832 // Invariant: m->_recursions should already be 0, so we don't need to explicitly set it. 1833 // Intentional fall-through into DONE_LABEL ... 1834 } else { 1835 movptr(Address(boxReg, 0), intptr_t(markOopDesc::unused_mark())); // results in ST-before-CAS penalty 1836 movptr(boxReg, tmpReg); 1837 1838 // Using a prefetchw helps avoid later RTS->RTO upgrades and cache probes 1839 if ((EmitSync & 2048) && VM_Version::supports_3dnow_prefetch() && os::is_MP()) { 1840 // prefetchw [eax + Offset(_owner)-2] 1841 prefetchw(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); 1842 } 1843 1844 if ((EmitSync & 64) == 0) { 1845 // Optimistic form 1846 xorptr (tmpReg, tmpReg); 1847 } else { 1848 // Can suffer RTS->RTO upgrades on shared or cold $ lines 1849 movptr(tmpReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); // rax, = m->_owner 1850 testptr(tmpReg, tmpReg); // Locked ? 1851 jccb (Assembler::notZero, DONE_LABEL); 1852 } 1853 1854 // Appears unlocked - try to swing _owner from null to non-null. 1855 // Use either "Self" (in scr) or rsp as thread identity in _owner. 1856 // Invariant: tmpReg == 0. tmpReg is EAX which is the implicit cmpxchg comparand. 1857 get_thread (scrReg); 1858 if (os::is_MP()) { 1859 lock(); 1860 } 1861 cmpxchgptr(scrReg, Address(boxReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); 1862 1863 // If the CAS fails we can either retry or pass control to the slow-path. 1864 // We use the latter tactic. 1865 // Pass the CAS result in the icc.ZFlag into DONE_LABEL 1866 // If the CAS was successful ... 1867 // Self has acquired the lock 1868 // Invariant: m->_recursions should already be 0, so we don't need to explicitly set it. 1869 // Intentional fall-through into DONE_LABEL ... 1870 } 1871 #else // _LP64 1872 // It's inflated 1873 movq(scrReg, tmpReg); 1874 xorq(tmpReg, tmpReg); 1875 1876 if (os::is_MP()) { 1877 lock(); 1878 } 1879 cmpxchgptr(r15_thread, Address(scrReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); 1880 // Unconditionally set box->_displaced_header = markOopDesc::unused_mark(). 1881 // Without cast to int32_t movptr will destroy r10 which is typically obj. 1882 movptr(Address(boxReg, 0), (int32_t)intptr_t(markOopDesc::unused_mark())); 1883 // Intentional fall-through into DONE_LABEL ... 1884 // Propagate ICC.ZF from CAS above into DONE_LABEL. 1885 #endif // _LP64 1886 #if INCLUDE_RTM_OPT 1887 } // use_rtm() 1888 #endif 1889 // DONE_LABEL is a hot target - we'd really like to place it at the 1890 // start of cache line by padding with NOPs. 1891 // See the AMD and Intel software optimization manuals for the 1892 // most efficient "long" NOP encodings. 1893 // Unfortunately none of our alignment mechanisms suffice. 1894 bind(DONE_LABEL); 1895 1896 // At DONE_LABEL the icc ZFlag is set as follows ... 1897 // Fast_Unlock uses the same protocol. 1898 // ZFlag == 1 -> Success 1899 // ZFlag == 0 -> Failure - force control through the slow-path 1900 } 1901 } 1902 1903 // obj: object to unlock 1904 // box: box address (displaced header location), killed. Must be EAX. 1905 // tmp: killed, cannot be obj nor box. 1906 // 1907 // Some commentary on balanced locking: 1908 // 1909 // Fast_Lock and Fast_Unlock are emitted only for provably balanced lock sites. 1910 // Methods that don't have provably balanced locking are forced to run in the 1911 // interpreter - such methods won't be compiled to use fast_lock and fast_unlock. 1912 // The interpreter provides two properties: 1913 // I1: At return-time the interpreter automatically and quietly unlocks any 1914 // objects acquired the current activation (frame). Recall that the 1915 // interpreter maintains an on-stack list of locks currently held by 1916 // a frame. 1917 // I2: If a method attempts to unlock an object that is not held by the 1918 // the frame the interpreter throws IMSX. 1919 // 1920 // Lets say A(), which has provably balanced locking, acquires O and then calls B(). 1921 // B() doesn't have provably balanced locking so it runs in the interpreter. 1922 // Control returns to A() and A() unlocks O. By I1 and I2, above, we know that O 1923 // is still locked by A(). 1924 // 1925 // The only other source of unbalanced locking would be JNI. The "Java Native Interface: 1926 // Programmer's Guide and Specification" claims that an object locked by jni_monitorenter 1927 // should not be unlocked by "normal" java-level locking and vice-versa. The specification 1928 // doesn't specify what will occur if a program engages in such mixed-mode locking, however. 1929 // Arguably given that the spec legislates the JNI case as undefined our implementation 1930 // could reasonably *avoid* checking owner in Fast_Unlock(). 1931 // In the interest of performance we elide m->Owner==Self check in unlock. 1932 // A perfectly viable alternative is to elide the owner check except when 1933 // Xcheck:jni is enabled. 1934 1935 void MacroAssembler::fast_unlock(Register objReg, Register boxReg, Register tmpReg, bool use_rtm) { 1936 assert(boxReg == rax, ""); 1937 assert_different_registers(objReg, boxReg, tmpReg); 1938 1939 if (EmitSync & 4) { 1940 // Disable - inhibit all inlining. Force control through the slow-path 1941 cmpptr (rsp, 0); 1942 } else { 1943 Label DONE_LABEL, Stacked, CheckSucc; 1944 1945 // Critically, the biased locking test must have precedence over 1946 // and appear before the (box->dhw == 0) recursive stack-lock test. 1947 if (UseBiasedLocking && !UseOptoBiasInlining) { 1948 biased_locking_exit(objReg, tmpReg, DONE_LABEL); 1949 } 1950 1951 #if INCLUDE_RTM_OPT 1952 if (UseRTMForStackLocks && use_rtm) { 1953 assert(!UseBiasedLocking, "Biased locking is not supported with RTM locking"); 1954 Label L_regular_unlock; 1955 movptr(tmpReg, Address(objReg, 0)); // fetch markword 1956 andptr(tmpReg, markOopDesc::biased_lock_mask_in_place); // look at 3 lock bits 1957 cmpptr(tmpReg, markOopDesc::unlocked_value); // bits = 001 unlocked 1958 jccb(Assembler::notEqual, L_regular_unlock); // if !HLE RegularLock 1959 xend(); // otherwise end... 1960 jmp(DONE_LABEL); // ... and we're done 1961 bind(L_regular_unlock); 1962 } 1963 #endif 1964 1965 cmpptr(Address(boxReg, 0), (int32_t)NULL_WORD); // Examine the displaced header 1966 jcc (Assembler::zero, DONE_LABEL); // 0 indicates recursive stack-lock 1967 movptr(tmpReg, Address(objReg, 0)); // Examine the object's markword 1968 testptr(tmpReg, markOopDesc::monitor_value); // Inflated? 1969 jccb (Assembler::zero, Stacked); 1970 1971 // It's inflated. 1972 #if INCLUDE_RTM_OPT 1973 if (use_rtm) { 1974 Label L_regular_inflated_unlock; 1975 int owner_offset = OM_OFFSET_NO_MONITOR_VALUE_TAG(owner); 1976 movptr(boxReg, Address(tmpReg, owner_offset)); 1977 testptr(boxReg, boxReg); 1978 jccb(Assembler::notZero, L_regular_inflated_unlock); 1979 xend(); 1980 jmpb(DONE_LABEL); 1981 bind(L_regular_inflated_unlock); 1982 } 1983 #endif 1984 1985 // Despite our balanced locking property we still check that m->_owner == Self 1986 // as java routines or native JNI code called by this thread might 1987 // have released the lock. 1988 // Refer to the comments in synchronizer.cpp for how we might encode extra 1989 // state in _succ so we can avoid fetching EntryList|cxq. 1990 // 1991 // I'd like to add more cases in fast_lock() and fast_unlock() -- 1992 // such as recursive enter and exit -- but we have to be wary of 1993 // I$ bloat, T$ effects and BP$ effects. 1994 // 1995 // If there's no contention try a 1-0 exit. That is, exit without 1996 // a costly MEMBAR or CAS. See synchronizer.cpp for details on how 1997 // we detect and recover from the race that the 1-0 exit admits. 1998 // 1999 // Conceptually Fast_Unlock() must execute a STST|LDST "release" barrier 2000 // before it STs null into _owner, releasing the lock. Updates 2001 // to data protected by the critical section must be visible before 2002 // we drop the lock (and thus before any other thread could acquire 2003 // the lock and observe the fields protected by the lock). 2004 // IA32's memory-model is SPO, so STs are ordered with respect to 2005 // each other and there's no need for an explicit barrier (fence). 2006 // See also http://gee.cs.oswego.edu/dl/jmm/cookbook.html. 2007 #ifndef _LP64 2008 get_thread (boxReg); 2009 if ((EmitSync & 4096) && VM_Version::supports_3dnow_prefetch() && os::is_MP()) { 2010 // prefetchw [ebx + Offset(_owner)-2] 2011 prefetchw(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); 2012 } 2013 2014 // Note that we could employ various encoding schemes to reduce 2015 // the number of loads below (currently 4) to just 2 or 3. 2016 // Refer to the comments in synchronizer.cpp. 2017 // In practice the chain of fetches doesn't seem to impact performance, however. 2018 xorptr(boxReg, boxReg); 2019 if ((EmitSync & 65536) == 0 && (EmitSync & 256)) { 2020 // Attempt to reduce branch density - AMD's branch predictor. 2021 orptr(boxReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(recursions))); 2022 orptr(boxReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(EntryList))); 2023 orptr(boxReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(cxq))); 2024 jccb (Assembler::notZero, DONE_LABEL); 2025 movptr(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner)), NULL_WORD); 2026 jmpb (DONE_LABEL); 2027 } else { 2028 orptr(boxReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(recursions))); 2029 jccb (Assembler::notZero, DONE_LABEL); 2030 movptr(boxReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(EntryList))); 2031 orptr(boxReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(cxq))); 2032 jccb (Assembler::notZero, CheckSucc); 2033 movptr(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner)), NULL_WORD); 2034 jmpb (DONE_LABEL); 2035 } 2036 2037 // The Following code fragment (EmitSync & 65536) improves the performance of 2038 // contended applications and contended synchronization microbenchmarks. 2039 // Unfortunately the emission of the code - even though not executed - causes regressions 2040 // in scimark and jetstream, evidently because of $ effects. Replacing the code 2041 // with an equal number of never-executed NOPs results in the same regression. 2042 // We leave it off by default. 2043 2044 if ((EmitSync & 65536) != 0) { 2045 Label LSuccess, LGoSlowPath ; 2046 2047 bind (CheckSucc); 2048 2049 // Optional pre-test ... it's safe to elide this 2050 cmpptr(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(succ)), (int32_t)NULL_WORD); 2051 jccb(Assembler::zero, LGoSlowPath); 2052 2053 // We have a classic Dekker-style idiom: 2054 // ST m->_owner = 0 ; MEMBAR; LD m->_succ 2055 // There are a number of ways to implement the barrier: 2056 // (1) lock:andl &m->_owner, 0 2057 // is fast, but mask doesn't currently support the "ANDL M,IMM32" form. 2058 // LOCK: ANDL [ebx+Offset(_Owner)-2], 0 2059 // Encodes as 81 31 OFF32 IMM32 or 83 63 OFF8 IMM8 2060 // (2) If supported, an explicit MFENCE is appealing. 2061 // In older IA32 processors MFENCE is slower than lock:add or xchg 2062 // particularly if the write-buffer is full as might be the case if 2063 // if stores closely precede the fence or fence-equivalent instruction. 2064 // See https://blogs.oracle.com/dave/entry/instruction_selection_for_volatile_fences 2065 // as the situation has changed with Nehalem and Shanghai. 2066 // (3) In lieu of an explicit fence, use lock:addl to the top-of-stack 2067 // The $lines underlying the top-of-stack should be in M-state. 2068 // The locked add instruction is serializing, of course. 2069 // (4) Use xchg, which is serializing 2070 // mov boxReg, 0; xchgl boxReg, [tmpReg + Offset(_owner)-2] also works 2071 // (5) ST m->_owner = 0 and then execute lock:orl &m->_succ, 0. 2072 // The integer condition codes will tell us if succ was 0. 2073 // Since _succ and _owner should reside in the same $line and 2074 // we just stored into _owner, it's likely that the $line 2075 // remains in M-state for the lock:orl. 2076 // 2077 // We currently use (3), although it's likely that switching to (2) 2078 // is correct for the future. 2079 2080 movptr(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner)), NULL_WORD); 2081 if (os::is_MP()) { 2082 lock(); addptr(Address(rsp, 0), 0); 2083 } 2084 // Ratify _succ remains non-null 2085 cmpptr(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(succ)), 0); 2086 jccb (Assembler::notZero, LSuccess); 2087 2088 xorptr(boxReg, boxReg); // box is really EAX 2089 if (os::is_MP()) { lock(); } 2090 cmpxchgptr(rsp, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); 2091 // There's no successor so we tried to regrab the lock with the 2092 // placeholder value. If that didn't work, then another thread 2093 // grabbed the lock so we're done (and exit was a success). 2094 jccb (Assembler::notEqual, LSuccess); 2095 // Since we're low on registers we installed rsp as a placeholding in _owner. 2096 // Now install Self over rsp. This is safe as we're transitioning from 2097 // non-null to non=null 2098 get_thread (boxReg); 2099 movptr(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner)), boxReg); 2100 // Intentional fall-through into LGoSlowPath ... 2101 2102 bind (LGoSlowPath); 2103 orptr(boxReg, 1); // set ICC.ZF=0 to indicate failure 2104 jmpb (DONE_LABEL); 2105 2106 bind (LSuccess); 2107 xorptr(boxReg, boxReg); // set ICC.ZF=1 to indicate success 2108 jmpb (DONE_LABEL); 2109 } 2110 2111 bind (Stacked); 2112 // It's not inflated and it's not recursively stack-locked and it's not biased. 2113 // It must be stack-locked. 2114 // Try to reset the header to displaced header. 2115 // The "box" value on the stack is stable, so we can reload 2116 // and be assured we observe the same value as above. 2117 movptr(tmpReg, Address(boxReg, 0)); 2118 if (os::is_MP()) { 2119 lock(); 2120 } 2121 cmpxchgptr(tmpReg, Address(objReg, 0)); // Uses RAX which is box 2122 // Intention fall-thru into DONE_LABEL 2123 2124 // DONE_LABEL is a hot target - we'd really like to place it at the 2125 // start of cache line by padding with NOPs. 2126 // See the AMD and Intel software optimization manuals for the 2127 // most efficient "long" NOP encodings. 2128 // Unfortunately none of our alignment mechanisms suffice. 2129 if ((EmitSync & 65536) == 0) { 2130 bind (CheckSucc); 2131 } 2132 #else // _LP64 2133 // It's inflated 2134 if (EmitSync & 1024) { 2135 // Emit code to check that _owner == Self 2136 // We could fold the _owner test into subsequent code more efficiently 2137 // than using a stand-alone check, but since _owner checking is off by 2138 // default we don't bother. We also might consider predicating the 2139 // _owner==Self check on Xcheck:jni or running on a debug build. 2140 movptr(boxReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); 2141 xorptr(boxReg, r15_thread); 2142 } else { 2143 xorptr(boxReg, boxReg); 2144 } 2145 orptr(boxReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(recursions))); 2146 jccb (Assembler::notZero, DONE_LABEL); 2147 movptr(boxReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(cxq))); 2148 orptr(boxReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(EntryList))); 2149 jccb (Assembler::notZero, CheckSucc); 2150 movptr(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner)), (int32_t)NULL_WORD); 2151 jmpb (DONE_LABEL); 2152 2153 if ((EmitSync & 65536) == 0) { 2154 // Try to avoid passing control into the slow_path ... 2155 Label LSuccess, LGoSlowPath ; 2156 bind (CheckSucc); 2157 2158 // The following optional optimization can be elided if necessary 2159 // Effectively: if (succ == null) goto SlowPath 2160 // The code reduces the window for a race, however, 2161 // and thus benefits performance. 2162 cmpptr(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(succ)), (int32_t)NULL_WORD); 2163 jccb (Assembler::zero, LGoSlowPath); 2164 2165 if ((EmitSync & 16) && os::is_MP()) { 2166 orptr(boxReg, boxReg); 2167 xchgptr(boxReg, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); 2168 } else { 2169 movptr(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner)), (int32_t)NULL_WORD); 2170 if (os::is_MP()) { 2171 // Memory barrier/fence 2172 // Dekker pivot point -- fulcrum : ST Owner; MEMBAR; LD Succ 2173 // Instead of MFENCE we use a dummy locked add of 0 to the top-of-stack. 2174 // This is faster on Nehalem and AMD Shanghai/Barcelona. 2175 // See https://blogs.oracle.com/dave/entry/instruction_selection_for_volatile_fences 2176 // We might also restructure (ST Owner=0;barrier;LD _Succ) to 2177 // (mov box,0; xchgq box, &m->Owner; LD _succ) . 2178 lock(); addl(Address(rsp, 0), 0); 2179 } 2180 } 2181 cmpptr(Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(succ)), (int32_t)NULL_WORD); 2182 jccb (Assembler::notZero, LSuccess); 2183 2184 // Rare inopportune interleaving - race. 2185 // The successor vanished in the small window above. 2186 // The lock is contended -- (cxq|EntryList) != null -- and there's no apparent successor. 2187 // We need to ensure progress and succession. 2188 // Try to reacquire the lock. 2189 // If that fails then the new owner is responsible for succession and this 2190 // thread needs to take no further action and can exit via the fast path (success). 2191 // If the re-acquire succeeds then pass control into the slow path. 2192 // As implemented, this latter mode is horrible because we generated more 2193 // coherence traffic on the lock *and* artifically extended the critical section 2194 // length while by virtue of passing control into the slow path. 2195 2196 // box is really RAX -- the following CMPXCHG depends on that binding 2197 // cmpxchg R,[M] is equivalent to rax = CAS(M,rax,R) 2198 movptr(boxReg, (int32_t)NULL_WORD); 2199 if (os::is_MP()) { lock(); } 2200 cmpxchgptr(r15_thread, Address(tmpReg, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); 2201 // There's no successor so we tried to regrab the lock. 2202 // If that didn't work, then another thread grabbed the 2203 // lock so we're done (and exit was a success). 2204 jccb (Assembler::notEqual, LSuccess); 2205 // Intentional fall-through into slow-path 2206 2207 bind (LGoSlowPath); 2208 orl (boxReg, 1); // set ICC.ZF=0 to indicate failure 2209 jmpb (DONE_LABEL); 2210 2211 bind (LSuccess); 2212 testl (boxReg, 0); // set ICC.ZF=1 to indicate success 2213 jmpb (DONE_LABEL); 2214 } 2215 2216 bind (Stacked); 2217 movptr(tmpReg, Address (boxReg, 0)); // re-fetch 2218 if (os::is_MP()) { lock(); } 2219 cmpxchgptr(tmpReg, Address(objReg, 0)); // Uses RAX which is box 2220 2221 if (EmitSync & 65536) { 2222 bind (CheckSucc); 2223 } 2224 #endif 2225 bind(DONE_LABEL); 2226 } 2227 } 2228 #endif // COMPILER2 2229 2230 void MacroAssembler::c2bool(Register x) { 2231 // implements x == 0 ? 0 : 1 2232 // note: must only look at least-significant byte of x 2233 // since C-style booleans are stored in one byte 2234 // only! (was bug) 2235 andl(x, 0xFF); 2236 setb(Assembler::notZero, x); 2237 } 2238 2239 // Wouldn't need if AddressLiteral version had new name 2240 void MacroAssembler::call(Label& L, relocInfo::relocType rtype) { 2241 Assembler::call(L, rtype); 2242 } 2243 2244 void MacroAssembler::call(Register entry) { 2245 Assembler::call(entry); 2246 } 2247 2248 void MacroAssembler::call(AddressLiteral entry) { 2249 if (reachable(entry)) { 2250 Assembler::call_literal(entry.target(), entry.rspec()); 2251 } else { 2252 lea(rscratch1, entry); 2253 Assembler::call(rscratch1); 2254 } 2255 } 2256 2257 void MacroAssembler::ic_call(address entry) { 2258 RelocationHolder rh = virtual_call_Relocation::spec(pc()); 2259 movptr(rax, (intptr_t)Universe::non_oop_word()); 2260 call(AddressLiteral(entry, rh)); 2261 } 2262 2263 // Implementation of call_VM versions 2264 2265 void MacroAssembler::call_VM(Register oop_result, 2266 address entry_point, 2267 bool check_exceptions) { 2268 Label C, E; 2269 call(C, relocInfo::none); 2270 jmp(E); 2271 2272 bind(C); 2273 call_VM_helper(oop_result, entry_point, 0, check_exceptions); 2274 ret(0); 2275 2276 bind(E); 2277 } 2278 2279 void MacroAssembler::call_VM(Register oop_result, 2280 address entry_point, 2281 Register arg_1, 2282 bool check_exceptions) { 2283 Label C, E; 2284 call(C, relocInfo::none); 2285 jmp(E); 2286 2287 bind(C); 2288 pass_arg1(this, arg_1); 2289 call_VM_helper(oop_result, entry_point, 1, check_exceptions); 2290 ret(0); 2291 2292 bind(E); 2293 } 2294 2295 void MacroAssembler::call_VM(Register oop_result, 2296 address entry_point, 2297 Register arg_1, 2298 Register arg_2, 2299 bool check_exceptions) { 2300 Label C, E; 2301 call(C, relocInfo::none); 2302 jmp(E); 2303 2304 bind(C); 2305 2306 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 2307 2308 pass_arg2(this, arg_2); 2309 pass_arg1(this, arg_1); 2310 call_VM_helper(oop_result, entry_point, 2, check_exceptions); 2311 ret(0); 2312 2313 bind(E); 2314 } 2315 2316 void MacroAssembler::call_VM(Register oop_result, 2317 address entry_point, 2318 Register arg_1, 2319 Register arg_2, 2320 Register arg_3, 2321 bool check_exceptions) { 2322 Label C, E; 2323 call(C, relocInfo::none); 2324 jmp(E); 2325 2326 bind(C); 2327 2328 LP64_ONLY(assert(arg_1 != c_rarg3, "smashed arg")); 2329 LP64_ONLY(assert(arg_2 != c_rarg3, "smashed arg")); 2330 pass_arg3(this, arg_3); 2331 2332 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 2333 pass_arg2(this, arg_2); 2334 2335 pass_arg1(this, arg_1); 2336 call_VM_helper(oop_result, entry_point, 3, check_exceptions); 2337 ret(0); 2338 2339 bind(E); 2340 } 2341 2342 void MacroAssembler::call_VM(Register oop_result, 2343 Register last_java_sp, 2344 address entry_point, 2345 int number_of_arguments, 2346 bool check_exceptions) { 2347 Register thread = LP64_ONLY(r15_thread) NOT_LP64(noreg); 2348 call_VM_base(oop_result, thread, last_java_sp, entry_point, number_of_arguments, check_exceptions); 2349 } 2350 2351 void MacroAssembler::call_VM(Register oop_result, 2352 Register last_java_sp, 2353 address entry_point, 2354 Register arg_1, 2355 bool check_exceptions) { 2356 pass_arg1(this, arg_1); 2357 call_VM(oop_result, last_java_sp, entry_point, 1, check_exceptions); 2358 } 2359 2360 void MacroAssembler::call_VM(Register oop_result, 2361 Register last_java_sp, 2362 address entry_point, 2363 Register arg_1, 2364 Register arg_2, 2365 bool check_exceptions) { 2366 2367 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 2368 pass_arg2(this, arg_2); 2369 pass_arg1(this, arg_1); 2370 call_VM(oop_result, last_java_sp, entry_point, 2, check_exceptions); 2371 } 2372 2373 void MacroAssembler::call_VM(Register oop_result, 2374 Register last_java_sp, 2375 address entry_point, 2376 Register arg_1, 2377 Register arg_2, 2378 Register arg_3, 2379 bool check_exceptions) { 2380 LP64_ONLY(assert(arg_1 != c_rarg3, "smashed arg")); 2381 LP64_ONLY(assert(arg_2 != c_rarg3, "smashed arg")); 2382 pass_arg3(this, arg_3); 2383 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 2384 pass_arg2(this, arg_2); 2385 pass_arg1(this, arg_1); 2386 call_VM(oop_result, last_java_sp, entry_point, 3, check_exceptions); 2387 } 2388 2389 void MacroAssembler::super_call_VM(Register oop_result, 2390 Register last_java_sp, 2391 address entry_point, 2392 int number_of_arguments, 2393 bool check_exceptions) { 2394 Register thread = LP64_ONLY(r15_thread) NOT_LP64(noreg); 2395 MacroAssembler::call_VM_base(oop_result, thread, last_java_sp, entry_point, number_of_arguments, check_exceptions); 2396 } 2397 2398 void MacroAssembler::super_call_VM(Register oop_result, 2399 Register last_java_sp, 2400 address entry_point, 2401 Register arg_1, 2402 bool check_exceptions) { 2403 pass_arg1(this, arg_1); 2404 super_call_VM(oop_result, last_java_sp, entry_point, 1, check_exceptions); 2405 } 2406 2407 void MacroAssembler::super_call_VM(Register oop_result, 2408 Register last_java_sp, 2409 address entry_point, 2410 Register arg_1, 2411 Register arg_2, 2412 bool check_exceptions) { 2413 2414 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 2415 pass_arg2(this, arg_2); 2416 pass_arg1(this, arg_1); 2417 super_call_VM(oop_result, last_java_sp, entry_point, 2, check_exceptions); 2418 } 2419 2420 void MacroAssembler::super_call_VM(Register oop_result, 2421 Register last_java_sp, 2422 address entry_point, 2423 Register arg_1, 2424 Register arg_2, 2425 Register arg_3, 2426 bool check_exceptions) { 2427 LP64_ONLY(assert(arg_1 != c_rarg3, "smashed arg")); 2428 LP64_ONLY(assert(arg_2 != c_rarg3, "smashed arg")); 2429 pass_arg3(this, arg_3); 2430 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 2431 pass_arg2(this, arg_2); 2432 pass_arg1(this, arg_1); 2433 super_call_VM(oop_result, last_java_sp, entry_point, 3, check_exceptions); 2434 } 2435 2436 void MacroAssembler::call_VM_base(Register oop_result, 2437 Register java_thread, 2438 Register last_java_sp, 2439 address entry_point, 2440 int number_of_arguments, 2441 bool check_exceptions) { 2442 // determine java_thread register 2443 if (!java_thread->is_valid()) { 2444 #ifdef _LP64 2445 java_thread = r15_thread; 2446 #else 2447 java_thread = rdi; 2448 get_thread(java_thread); 2449 #endif // LP64 2450 } 2451 // determine last_java_sp register 2452 if (!last_java_sp->is_valid()) { 2453 last_java_sp = rsp; 2454 } 2455 // debugging support 2456 assert(number_of_arguments >= 0 , "cannot have negative number of arguments"); 2457 LP64_ONLY(assert(java_thread == r15_thread, "unexpected register")); 2458 #ifdef ASSERT 2459 // TraceBytecodes does not use r12 but saves it over the call, so don't verify 2460 // r12 is the heapbase. 2461 LP64_ONLY(if ((UseCompressedOops || UseCompressedClassPointers) && !TraceBytecodes) verify_heapbase("call_VM_base: heap base corrupted?");) 2462 #endif // ASSERT 2463 2464 assert(java_thread != oop_result , "cannot use the same register for java_thread & oop_result"); 2465 assert(java_thread != last_java_sp, "cannot use the same register for java_thread & last_java_sp"); 2466 2467 // push java thread (becomes first argument of C function) 2468 2469 NOT_LP64(push(java_thread); number_of_arguments++); 2470 LP64_ONLY(mov(c_rarg0, r15_thread)); 2471 2472 // set last Java frame before call 2473 assert(last_java_sp != rbp, "can't use ebp/rbp"); 2474 2475 // Only interpreter should have to set fp 2476 set_last_Java_frame(java_thread, last_java_sp, rbp, NULL); 2477 2478 // do the call, remove parameters 2479 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments); 2480 2481 // restore the thread (cannot use the pushed argument since arguments 2482 // may be overwritten by C code generated by an optimizing compiler); 2483 // however can use the register value directly if it is callee saved. 2484 if (LP64_ONLY(true ||) java_thread == rdi || java_thread == rsi) { 2485 // rdi & rsi (also r15) are callee saved -> nothing to do 2486 #ifdef ASSERT 2487 guarantee(java_thread != rax, "change this code"); 2488 push(rax); 2489 { Label L; 2490 get_thread(rax); 2491 cmpptr(java_thread, rax); 2492 jcc(Assembler::equal, L); 2493 STOP("MacroAssembler::call_VM_base: rdi not callee saved?"); 2494 bind(L); 2495 } 2496 pop(rax); 2497 #endif 2498 } else { 2499 get_thread(java_thread); 2500 } 2501 // reset last Java frame 2502 // Only interpreter should have to clear fp 2503 reset_last_Java_frame(java_thread, true, false); 2504 2505 #ifndef CC_INTERP 2506 // C++ interp handles this in the interpreter 2507 check_and_handle_popframe(java_thread); 2508 check_and_handle_earlyret(java_thread); 2509 #endif /* CC_INTERP */ 2510 2511 if (check_exceptions) { 2512 // check for pending exceptions (java_thread is set upon return) 2513 cmpptr(Address(java_thread, Thread::pending_exception_offset()), (int32_t) NULL_WORD); 2514 #ifndef _LP64 2515 jump_cc(Assembler::notEqual, 2516 RuntimeAddress(StubRoutines::forward_exception_entry())); 2517 #else 2518 // This used to conditionally jump to forward_exception however it is 2519 // possible if we relocate that the branch will not reach. So we must jump 2520 // around so we can always reach 2521 2522 Label ok; 2523 jcc(Assembler::equal, ok); 2524 jump(RuntimeAddress(StubRoutines::forward_exception_entry())); 2525 bind(ok); 2526 #endif // LP64 2527 } 2528 2529 // get oop result if there is one and reset the value in the thread 2530 if (oop_result->is_valid()) { 2531 get_vm_result(oop_result, java_thread); 2532 } 2533 } 2534 2535 void MacroAssembler::call_VM_helper(Register oop_result, address entry_point, int number_of_arguments, bool check_exceptions) { 2536 2537 // Calculate the value for last_Java_sp 2538 // somewhat subtle. call_VM does an intermediate call 2539 // which places a return address on the stack just under the 2540 // stack pointer as the user finsihed with it. This allows 2541 // use to retrieve last_Java_pc from last_Java_sp[-1]. 2542 // On 32bit we then have to push additional args on the stack to accomplish 2543 // the actual requested call. On 64bit call_VM only can use register args 2544 // so the only extra space is the return address that call_VM created. 2545 // This hopefully explains the calculations here. 2546 2547 #ifdef _LP64 2548 // We've pushed one address, correct last_Java_sp 2549 lea(rax, Address(rsp, wordSize)); 2550 #else 2551 lea(rax, Address(rsp, (1 + number_of_arguments) * wordSize)); 2552 #endif // LP64 2553 2554 call_VM_base(oop_result, noreg, rax, entry_point, number_of_arguments, check_exceptions); 2555 2556 } 2557 2558 void MacroAssembler::call_VM_leaf(address entry_point, int number_of_arguments) { 2559 call_VM_leaf_base(entry_point, number_of_arguments); 2560 } 2561 2562 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0) { 2563 pass_arg0(this, arg_0); 2564 call_VM_leaf(entry_point, 1); 2565 } 2566 2567 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1) { 2568 2569 LP64_ONLY(assert(arg_0 != c_rarg1, "smashed arg")); 2570 pass_arg1(this, arg_1); 2571 pass_arg0(this, arg_0); 2572 call_VM_leaf(entry_point, 2); 2573 } 2574 2575 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) { 2576 LP64_ONLY(assert(arg_0 != c_rarg2, "smashed arg")); 2577 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 2578 pass_arg2(this, arg_2); 2579 LP64_ONLY(assert(arg_0 != c_rarg1, "smashed arg")); 2580 pass_arg1(this, arg_1); 2581 pass_arg0(this, arg_0); 2582 call_VM_leaf(entry_point, 3); 2583 } 2584 2585 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0) { 2586 pass_arg0(this, arg_0); 2587 MacroAssembler::call_VM_leaf_base(entry_point, 1); 2588 } 2589 2590 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1) { 2591 2592 LP64_ONLY(assert(arg_0 != c_rarg1, "smashed arg")); 2593 pass_arg1(this, arg_1); 2594 pass_arg0(this, arg_0); 2595 MacroAssembler::call_VM_leaf_base(entry_point, 2); 2596 } 2597 2598 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) { 2599 LP64_ONLY(assert(arg_0 != c_rarg2, "smashed arg")); 2600 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 2601 pass_arg2(this, arg_2); 2602 LP64_ONLY(assert(arg_0 != c_rarg1, "smashed arg")); 2603 pass_arg1(this, arg_1); 2604 pass_arg0(this, arg_0); 2605 MacroAssembler::call_VM_leaf_base(entry_point, 3); 2606 } 2607 2608 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2, Register arg_3) { 2609 LP64_ONLY(assert(arg_0 != c_rarg3, "smashed arg")); 2610 LP64_ONLY(assert(arg_1 != c_rarg3, "smashed arg")); 2611 LP64_ONLY(assert(arg_2 != c_rarg3, "smashed arg")); 2612 pass_arg3(this, arg_3); 2613 LP64_ONLY(assert(arg_0 != c_rarg2, "smashed arg")); 2614 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 2615 pass_arg2(this, arg_2); 2616 LP64_ONLY(assert(arg_0 != c_rarg1, "smashed arg")); 2617 pass_arg1(this, arg_1); 2618 pass_arg0(this, arg_0); 2619 MacroAssembler::call_VM_leaf_base(entry_point, 4); 2620 } 2621 2622 void MacroAssembler::get_vm_result(Register oop_result, Register java_thread) { 2623 movptr(oop_result, Address(java_thread, JavaThread::vm_result_offset())); 2624 movptr(Address(java_thread, JavaThread::vm_result_offset()), NULL_WORD); 2625 verify_oop(oop_result, "broken oop in call_VM_base"); 2626 } 2627 2628 void MacroAssembler::get_vm_result_2(Register metadata_result, Register java_thread) { 2629 movptr(metadata_result, Address(java_thread, JavaThread::vm_result_2_offset())); 2630 movptr(Address(java_thread, JavaThread::vm_result_2_offset()), NULL_WORD); 2631 } 2632 2633 void MacroAssembler::check_and_handle_earlyret(Register java_thread) { 2634 } 2635 2636 void MacroAssembler::check_and_handle_popframe(Register java_thread) { 2637 } 2638 2639 void MacroAssembler::cmp32(AddressLiteral src1, int32_t imm) { 2640 if (reachable(src1)) { 2641 cmpl(as_Address(src1), imm); 2642 } else { 2643 lea(rscratch1, src1); 2644 cmpl(Address(rscratch1, 0), imm); 2645 } 2646 } 2647 2648 void MacroAssembler::cmp32(Register src1, AddressLiteral src2) { 2649 assert(!src2.is_lval(), "use cmpptr"); 2650 if (reachable(src2)) { 2651 cmpl(src1, as_Address(src2)); 2652 } else { 2653 lea(rscratch1, src2); 2654 cmpl(src1, Address(rscratch1, 0)); 2655 } 2656 } 2657 2658 void MacroAssembler::cmp32(Register src1, int32_t imm) { 2659 Assembler::cmpl(src1, imm); 2660 } 2661 2662 void MacroAssembler::cmp32(Register src1, Address src2) { 2663 Assembler::cmpl(src1, src2); 2664 } 2665 2666 void MacroAssembler::cmpsd2int(XMMRegister opr1, XMMRegister opr2, Register dst, bool unordered_is_less) { 2667 ucomisd(opr1, opr2); 2668 2669 Label L; 2670 if (unordered_is_less) { 2671 movl(dst, -1); 2672 jcc(Assembler::parity, L); 2673 jcc(Assembler::below , L); 2674 movl(dst, 0); 2675 jcc(Assembler::equal , L); 2676 increment(dst); 2677 } else { // unordered is greater 2678 movl(dst, 1); 2679 jcc(Assembler::parity, L); 2680 jcc(Assembler::above , L); 2681 movl(dst, 0); 2682 jcc(Assembler::equal , L); 2683 decrementl(dst); 2684 } 2685 bind(L); 2686 } 2687 2688 void MacroAssembler::cmpss2int(XMMRegister opr1, XMMRegister opr2, Register dst, bool unordered_is_less) { 2689 ucomiss(opr1, opr2); 2690 2691 Label L; 2692 if (unordered_is_less) { 2693 movl(dst, -1); 2694 jcc(Assembler::parity, L); 2695 jcc(Assembler::below , L); 2696 movl(dst, 0); 2697 jcc(Assembler::equal , L); 2698 increment(dst); 2699 } else { // unordered is greater 2700 movl(dst, 1); 2701 jcc(Assembler::parity, L); 2702 jcc(Assembler::above , L); 2703 movl(dst, 0); 2704 jcc(Assembler::equal , L); 2705 decrementl(dst); 2706 } 2707 bind(L); 2708 } 2709 2710 2711 void MacroAssembler::cmp8(AddressLiteral src1, int imm) { 2712 if (reachable(src1)) { 2713 cmpb(as_Address(src1), imm); 2714 } else { 2715 lea(rscratch1, src1); 2716 cmpb(Address(rscratch1, 0), imm); 2717 } 2718 } 2719 2720 void MacroAssembler::cmpptr(Register src1, AddressLiteral src2) { 2721 #ifdef _LP64 2722 if (src2.is_lval()) { 2723 movptr(rscratch1, src2); 2724 Assembler::cmpq(src1, rscratch1); 2725 } else if (reachable(src2)) { 2726 cmpq(src1, as_Address(src2)); 2727 } else { 2728 lea(rscratch1, src2); 2729 Assembler::cmpq(src1, Address(rscratch1, 0)); 2730 } 2731 #else 2732 if (src2.is_lval()) { 2733 cmp_literal32(src1, (int32_t) src2.target(), src2.rspec()); 2734 } else { 2735 cmpl(src1, as_Address(src2)); 2736 } 2737 #endif // _LP64 2738 } 2739 2740 void MacroAssembler::cmpptr(Address src1, AddressLiteral src2) { 2741 assert(src2.is_lval(), "not a mem-mem compare"); 2742 #ifdef _LP64 2743 // moves src2's literal address 2744 movptr(rscratch1, src2); 2745 Assembler::cmpq(src1, rscratch1); 2746 #else 2747 cmp_literal32(src1, (int32_t) src2.target(), src2.rspec()); 2748 #endif // _LP64 2749 } 2750 2751 void MacroAssembler::locked_cmpxchgptr(Register reg, AddressLiteral adr) { 2752 if (reachable(adr)) { 2753 if (os::is_MP()) 2754 lock(); 2755 cmpxchgptr(reg, as_Address(adr)); 2756 } else { 2757 lea(rscratch1, adr); 2758 if (os::is_MP()) 2759 lock(); 2760 cmpxchgptr(reg, Address(rscratch1, 0)); 2761 } 2762 } 2763 2764 void MacroAssembler::cmpxchgptr(Register reg, Address adr) { 2765 LP64_ONLY(cmpxchgq(reg, adr)) NOT_LP64(cmpxchgl(reg, adr)); 2766 } 2767 2768 void MacroAssembler::comisd(XMMRegister dst, AddressLiteral src) { 2769 if (reachable(src)) { 2770 Assembler::comisd(dst, as_Address(src)); 2771 } else { 2772 lea(rscratch1, src); 2773 Assembler::comisd(dst, Address(rscratch1, 0)); 2774 } 2775 } 2776 2777 void MacroAssembler::comiss(XMMRegister dst, AddressLiteral src) { 2778 if (reachable(src)) { 2779 Assembler::comiss(dst, as_Address(src)); 2780 } else { 2781 lea(rscratch1, src); 2782 Assembler::comiss(dst, Address(rscratch1, 0)); 2783 } 2784 } 2785 2786 2787 void MacroAssembler::cond_inc32(Condition cond, AddressLiteral counter_addr) { 2788 Condition negated_cond = negate_condition(cond); 2789 Label L; 2790 jcc(negated_cond, L); 2791 pushf(); // Preserve flags 2792 atomic_incl(counter_addr); 2793 popf(); 2794 bind(L); 2795 } 2796 2797 int MacroAssembler::corrected_idivl(Register reg) { 2798 // Full implementation of Java idiv and irem; checks for 2799 // special case as described in JVM spec., p.243 & p.271. 2800 // The function returns the (pc) offset of the idivl 2801 // instruction - may be needed for implicit exceptions. 2802 // 2803 // normal case special case 2804 // 2805 // input : rax,: dividend min_int 2806 // reg: divisor (may not be rax,/rdx) -1 2807 // 2808 // output: rax,: quotient (= rax, idiv reg) min_int 2809 // rdx: remainder (= rax, irem reg) 0 2810 assert(reg != rax && reg != rdx, "reg cannot be rax, or rdx register"); 2811 const int min_int = 0x80000000; 2812 Label normal_case, special_case; 2813 2814 // check for special case 2815 cmpl(rax, min_int); 2816 jcc(Assembler::notEqual, normal_case); 2817 xorl(rdx, rdx); // prepare rdx for possible special case (where remainder = 0) 2818 cmpl(reg, -1); 2819 jcc(Assembler::equal, special_case); 2820 2821 // handle normal case 2822 bind(normal_case); 2823 cdql(); 2824 int idivl_offset = offset(); 2825 idivl(reg); 2826 2827 // normal and special case exit 2828 bind(special_case); 2829 2830 return idivl_offset; 2831 } 2832 2833 2834 2835 void MacroAssembler::decrementl(Register reg, int value) { 2836 if (value == min_jint) {subl(reg, value) ; return; } 2837 if (value < 0) { incrementl(reg, -value); return; } 2838 if (value == 0) { ; return; } 2839 if (value == 1 && UseIncDec) { decl(reg) ; return; } 2840 /* else */ { subl(reg, value) ; return; } 2841 } 2842 2843 void MacroAssembler::decrementl(Address dst, int value) { 2844 if (value == min_jint) {subl(dst, value) ; return; } 2845 if (value < 0) { incrementl(dst, -value); return; } 2846 if (value == 0) { ; return; } 2847 if (value == 1 && UseIncDec) { decl(dst) ; return; } 2848 /* else */ { subl(dst, value) ; return; } 2849 } 2850 2851 void MacroAssembler::division_with_shift (Register reg, int shift_value) { 2852 assert (shift_value > 0, "illegal shift value"); 2853 Label _is_positive; 2854 testl (reg, reg); 2855 jcc (Assembler::positive, _is_positive); 2856 int offset = (1 << shift_value) - 1 ; 2857 2858 if (offset == 1) { 2859 incrementl(reg); 2860 } else { 2861 addl(reg, offset); 2862 } 2863 2864 bind (_is_positive); 2865 sarl(reg, shift_value); 2866 } 2867 2868 void MacroAssembler::divsd(XMMRegister dst, AddressLiteral src) { 2869 if (reachable(src)) { 2870 Assembler::divsd(dst, as_Address(src)); 2871 } else { 2872 lea(rscratch1, src); 2873 Assembler::divsd(dst, Address(rscratch1, 0)); 2874 } 2875 } 2876 2877 void MacroAssembler::divss(XMMRegister dst, AddressLiteral src) { 2878 if (reachable(src)) { 2879 Assembler::divss(dst, as_Address(src)); 2880 } else { 2881 lea(rscratch1, src); 2882 Assembler::divss(dst, Address(rscratch1, 0)); 2883 } 2884 } 2885 2886 // !defined(COMPILER2) is because of stupid core builds 2887 #if !defined(_LP64) || defined(COMPILER1) || !defined(COMPILER2) 2888 void MacroAssembler::empty_FPU_stack() { 2889 if (VM_Version::supports_mmx()) { 2890 emms(); 2891 } else { 2892 for (int i = 8; i-- > 0; ) ffree(i); 2893 } 2894 } 2895 #endif // !LP64 || C1 || !C2 2896 2897 2898 // Defines obj, preserves var_size_in_bytes 2899 void MacroAssembler::eden_allocate(Register obj, 2900 Register var_size_in_bytes, 2901 int con_size_in_bytes, 2902 Register t1, 2903 Label& slow_case) { 2904 assert(obj == rax, "obj must be in rax, for cmpxchg"); 2905 assert_different_registers(obj, var_size_in_bytes, t1); 2906 if (!Universe::heap()->supports_inline_contig_alloc()) { 2907 jmp(slow_case); 2908 } else { 2909 Register end = t1; 2910 Label retry; 2911 bind(retry); 2912 ExternalAddress heap_top((address) Universe::heap()->top_addr()); 2913 movptr(obj, heap_top); 2914 if (var_size_in_bytes == noreg) { 2915 lea(end, Address(obj, con_size_in_bytes)); 2916 } else { 2917 lea(end, Address(obj, var_size_in_bytes, Address::times_1)); 2918 } 2919 // if end < obj then we wrapped around => object too long => slow case 2920 cmpptr(end, obj); 2921 jcc(Assembler::below, slow_case); 2922 cmpptr(end, ExternalAddress((address) Universe::heap()->end_addr())); 2923 jcc(Assembler::above, slow_case); 2924 // Compare obj with the top addr, and if still equal, store the new top addr in 2925 // end at the address of the top addr pointer. Sets ZF if was equal, and clears 2926 // it otherwise. Use lock prefix for atomicity on MPs. 2927 locked_cmpxchgptr(end, heap_top); 2928 jcc(Assembler::notEqual, retry); 2929 } 2930 } 2931 2932 void MacroAssembler::enter() { 2933 push(rbp); 2934 mov(rbp, rsp); 2935 } 2936 2937 // A 5 byte nop that is safe for patching (see patch_verified_entry) 2938 void MacroAssembler::fat_nop() { 2939 if (UseAddressNop) { 2940 addr_nop_5(); 2941 } else { 2942 emit_int8(0x26); // es: 2943 emit_int8(0x2e); // cs: 2944 emit_int8(0x64); // fs: 2945 emit_int8(0x65); // gs: 2946 emit_int8((unsigned char)0x90); 2947 } 2948 } 2949 2950 void MacroAssembler::fcmp(Register tmp) { 2951 fcmp(tmp, 1, true, true); 2952 } 2953 2954 void MacroAssembler::fcmp(Register tmp, int index, bool pop_left, bool pop_right) { 2955 assert(!pop_right || pop_left, "usage error"); 2956 if (VM_Version::supports_cmov()) { 2957 assert(tmp == noreg, "unneeded temp"); 2958 if (pop_left) { 2959 fucomip(index); 2960 } else { 2961 fucomi(index); 2962 } 2963 if (pop_right) { 2964 fpop(); 2965 } 2966 } else { 2967 assert(tmp != noreg, "need temp"); 2968 if (pop_left) { 2969 if (pop_right) { 2970 fcompp(); 2971 } else { 2972 fcomp(index); 2973 } 2974 } else { 2975 fcom(index); 2976 } 2977 // convert FPU condition into eflags condition via rax, 2978 save_rax(tmp); 2979 fwait(); fnstsw_ax(); 2980 sahf(); 2981 restore_rax(tmp); 2982 } 2983 // condition codes set as follows: 2984 // 2985 // CF (corresponds to C0) if x < y 2986 // PF (corresponds to C2) if unordered 2987 // ZF (corresponds to C3) if x = y 2988 } 2989 2990 void MacroAssembler::fcmp2int(Register dst, bool unordered_is_less) { 2991 fcmp2int(dst, unordered_is_less, 1, true, true); 2992 } 2993 2994 void MacroAssembler::fcmp2int(Register dst, bool unordered_is_less, int index, bool pop_left, bool pop_right) { 2995 fcmp(VM_Version::supports_cmov() ? noreg : dst, index, pop_left, pop_right); 2996 Label L; 2997 if (unordered_is_less) { 2998 movl(dst, -1); 2999 jcc(Assembler::parity, L); 3000 jcc(Assembler::below , L); 3001 movl(dst, 0); 3002 jcc(Assembler::equal , L); 3003 increment(dst); 3004 } else { // unordered is greater 3005 movl(dst, 1); 3006 jcc(Assembler::parity, L); 3007 jcc(Assembler::above , L); 3008 movl(dst, 0); 3009 jcc(Assembler::equal , L); 3010 decrementl(dst); 3011 } 3012 bind(L); 3013 } 3014 3015 void MacroAssembler::fld_d(AddressLiteral src) { 3016 fld_d(as_Address(src)); 3017 } 3018 3019 void MacroAssembler::fld_s(AddressLiteral src) { 3020 fld_s(as_Address(src)); 3021 } 3022 3023 void MacroAssembler::fld_x(AddressLiteral src) { 3024 Assembler::fld_x(as_Address(src)); 3025 } 3026 3027 void MacroAssembler::fldcw(AddressLiteral src) { 3028 Assembler::fldcw(as_Address(src)); 3029 } 3030 3031 void MacroAssembler::pow_exp_core_encoding() { 3032 // kills rax, rcx, rdx 3033 subptr(rsp,sizeof(jdouble)); 3034 // computes 2^X. Stack: X ... 3035 // f2xm1 computes 2^X-1 but only operates on -1<=X<=1. Get int(X) and 3036 // keep it on the thread's stack to compute 2^int(X) later 3037 // then compute 2^(X-int(X)) as (2^(X-int(X)-1+1) 3038 // final result is obtained with: 2^X = 2^int(X) * 2^(X-int(X)) 3039 fld_s(0); // Stack: X X ... 3040 frndint(); // Stack: int(X) X ... 3041 fsuba(1); // Stack: int(X) X-int(X) ... 3042 fistp_s(Address(rsp,0)); // move int(X) as integer to thread's stack. Stack: X-int(X) ... 3043 f2xm1(); // Stack: 2^(X-int(X))-1 ... 3044 fld1(); // Stack: 1 2^(X-int(X))-1 ... 3045 faddp(1); // Stack: 2^(X-int(X)) 3046 // computes 2^(int(X)): add exponent bias (1023) to int(X), then 3047 // shift int(X)+1023 to exponent position. 3048 // Exponent is limited to 11 bits if int(X)+1023 does not fit in 11 3049 // bits, set result to NaN. 0x000 and 0x7FF are reserved exponent 3050 // values so detect them and set result to NaN. 3051 movl(rax,Address(rsp,0)); 3052 movl(rcx, -2048); // 11 bit mask and valid NaN binary encoding 3053 addl(rax, 1023); 3054 movl(rdx,rax); 3055 shll(rax,20); 3056 // Check that 0 < int(X)+1023 < 2047. Otherwise set rax to NaN. 3057 addl(rdx,1); 3058 // Check that 1 < int(X)+1023+1 < 2048 3059 // in 3 steps: 3060 // 1- (int(X)+1023+1)&-2048 == 0 => 0 <= int(X)+1023+1 < 2048 3061 // 2- (int(X)+1023+1)&-2048 != 0 3062 // 3- (int(X)+1023+1)&-2048 != 1 3063 // Do 2- first because addl just updated the flags. 3064 cmov32(Assembler::equal,rax,rcx); 3065 cmpl(rdx,1); 3066 cmov32(Assembler::equal,rax,rcx); 3067 testl(rdx,rcx); 3068 cmov32(Assembler::notEqual,rax,rcx); 3069 movl(Address(rsp,4),rax); 3070 movl(Address(rsp,0),0); 3071 fmul_d(Address(rsp,0)); // Stack: 2^X ... 3072 addptr(rsp,sizeof(jdouble)); 3073 } 3074 3075 void MacroAssembler::increase_precision() { 3076 subptr(rsp, BytesPerWord); 3077 fnstcw(Address(rsp, 0)); 3078 movl(rax, Address(rsp, 0)); 3079 orl(rax, 0x300); 3080 push(rax); 3081 fldcw(Address(rsp, 0)); 3082 pop(rax); 3083 } 3084 3085 void MacroAssembler::restore_precision() { 3086 fldcw(Address(rsp, 0)); 3087 addptr(rsp, BytesPerWord); 3088 } 3089 3090 void MacroAssembler::fast_pow() { 3091 // computes X^Y = 2^(Y * log2(X)) 3092 // if fast computation is not possible, result is NaN. Requires 3093 // fallback from user of this macro. 3094 // increase precision for intermediate steps of the computation 3095 BLOCK_COMMENT("fast_pow {"); 3096 increase_precision(); 3097 fyl2x(); // Stack: (Y*log2(X)) ... 3098 pow_exp_core_encoding(); // Stack: exp(X) ... 3099 restore_precision(); 3100 BLOCK_COMMENT("} fast_pow"); 3101 } 3102 3103 void MacroAssembler::fast_exp() { 3104 // computes exp(X) = 2^(X * log2(e)) 3105 // if fast computation is not possible, result is NaN. Requires 3106 // fallback from user of this macro. 3107 // increase precision for intermediate steps of the computation 3108 increase_precision(); 3109 fldl2e(); // Stack: log2(e) X ... 3110 fmulp(1); // Stack: (X*log2(e)) ... 3111 pow_exp_core_encoding(); // Stack: exp(X) ... 3112 restore_precision(); 3113 } 3114 3115 void MacroAssembler::pow_or_exp(bool is_exp, int num_fpu_regs_in_use) { 3116 // kills rax, rcx, rdx 3117 // pow and exp needs 2 extra registers on the fpu stack. 3118 Label slow_case, done; 3119 Register tmp = noreg; 3120 if (!VM_Version::supports_cmov()) { 3121 // fcmp needs a temporary so preserve rdx, 3122 tmp = rdx; 3123 } 3124 Register tmp2 = rax; 3125 Register tmp3 = rcx; 3126 3127 if (is_exp) { 3128 // Stack: X 3129 fld_s(0); // duplicate argument for runtime call. Stack: X X 3130 fast_exp(); // Stack: exp(X) X 3131 fcmp(tmp, 0, false, false); // Stack: exp(X) X 3132 // exp(X) not equal to itself: exp(X) is NaN go to slow case. 3133 jcc(Assembler::parity, slow_case); 3134 // get rid of duplicate argument. Stack: exp(X) 3135 if (num_fpu_regs_in_use > 0) { 3136 fxch(); 3137 fpop(); 3138 } else { 3139 ffree(1); 3140 } 3141 jmp(done); 3142 } else { 3143 // Stack: X Y 3144 Label x_negative, y_not_2; 3145 3146 static double two = 2.0; 3147 ExternalAddress two_addr((address)&two); 3148 3149 // constant maybe too far on 64 bit 3150 lea(tmp2, two_addr); 3151 fld_d(Address(tmp2, 0)); // Stack: 2 X Y 3152 fcmp(tmp, 2, true, false); // Stack: X Y 3153 jcc(Assembler::parity, y_not_2); 3154 jcc(Assembler::notEqual, y_not_2); 3155 3156 fxch(); fpop(); // Stack: X 3157 fmul(0); // Stack: X*X 3158 3159 jmp(done); 3160 3161 bind(y_not_2); 3162 3163 fldz(); // Stack: 0 X Y 3164 fcmp(tmp, 1, true, false); // Stack: X Y 3165 jcc(Assembler::above, x_negative); 3166 3167 // X >= 0 3168 3169 fld_s(1); // duplicate arguments for runtime call. Stack: Y X Y 3170 fld_s(1); // Stack: X Y X Y 3171 fast_pow(); // Stack: X^Y X Y 3172 fcmp(tmp, 0, false, false); // Stack: X^Y X Y 3173 // X^Y not equal to itself: X^Y is NaN go to slow case. 3174 jcc(Assembler::parity, slow_case); 3175 // get rid of duplicate arguments. Stack: X^Y 3176 if (num_fpu_regs_in_use > 0) { 3177 fxch(); fpop(); 3178 fxch(); fpop(); 3179 } else { 3180 ffree(2); 3181 ffree(1); 3182 } 3183 jmp(done); 3184 3185 // X <= 0 3186 bind(x_negative); 3187 3188 fld_s(1); // Stack: Y X Y 3189 frndint(); // Stack: int(Y) X Y 3190 fcmp(tmp, 2, false, false); // Stack: int(Y) X Y 3191 jcc(Assembler::notEqual, slow_case); 3192 3193 subptr(rsp, 8); 3194 3195 // For X^Y, when X < 0, Y has to be an integer and the final 3196 // result depends on whether it's odd or even. We just checked 3197 // that int(Y) == Y. We move int(Y) to gp registers as a 64 bit 3198 // integer to test its parity. If int(Y) is huge and doesn't fit 3199 // in the 64 bit integer range, the integer indefinite value will 3200 // end up in the gp registers. Huge numbers are all even, the 3201 // integer indefinite number is even so it's fine. 3202 3203 #ifdef ASSERT 3204 // Let's check we don't end up with an integer indefinite number 3205 // when not expected. First test for huge numbers: check whether 3206 // int(Y)+1 == int(Y) which is true for very large numbers and 3207 // those are all even. A 64 bit integer is guaranteed to not 3208 // overflow for numbers where y+1 != y (when precision is set to 3209 // double precision). 3210 Label y_not_huge; 3211 3212 fld1(); // Stack: 1 int(Y) X Y 3213 fadd(1); // Stack: 1+int(Y) int(Y) X Y 3214 3215 #ifdef _LP64 3216 // trip to memory to force the precision down from double extended 3217 // precision 3218 fstp_d(Address(rsp, 0)); 3219 fld_d(Address(rsp, 0)); 3220 #endif 3221 3222 fcmp(tmp, 1, true, false); // Stack: int(Y) X Y 3223 #endif 3224 3225 // move int(Y) as 64 bit integer to thread's stack 3226 fistp_d(Address(rsp,0)); // Stack: X Y 3227 3228 #ifdef ASSERT 3229 jcc(Assembler::notEqual, y_not_huge); 3230 3231 // Y is huge so we know it's even. It may not fit in a 64 bit 3232 // integer and we don't want the debug code below to see the 3233 // integer indefinite value so overwrite int(Y) on the thread's 3234 // stack with 0. 3235 movl(Address(rsp, 0), 0); 3236 movl(Address(rsp, 4), 0); 3237 3238 bind(y_not_huge); 3239 #endif 3240 3241 fld_s(1); // duplicate arguments for runtime call. Stack: Y X Y 3242 fld_s(1); // Stack: X Y X Y 3243 fabs(); // Stack: abs(X) Y X Y 3244 fast_pow(); // Stack: abs(X)^Y X Y 3245 fcmp(tmp, 0, false, false); // Stack: abs(X)^Y X Y 3246 // abs(X)^Y not equal to itself: abs(X)^Y is NaN go to slow case. 3247 3248 pop(tmp2); 3249 NOT_LP64(pop(tmp3)); 3250 jcc(Assembler::parity, slow_case); 3251 3252 #ifdef ASSERT 3253 // Check that int(Y) is not integer indefinite value (int 3254 // overflow). Shouldn't happen because for values that would 3255 // overflow, 1+int(Y)==Y which was tested earlier. 3256 #ifndef _LP64 3257 { 3258 Label integer; 3259 testl(tmp2, tmp2); 3260 jcc(Assembler::notZero, integer); 3261 cmpl(tmp3, 0x80000000); 3262 jcc(Assembler::notZero, integer); 3263 STOP("integer indefinite value shouldn't be seen here"); 3264 bind(integer); 3265 } 3266 #else 3267 { 3268 Label integer; 3269 mov(tmp3, tmp2); // preserve tmp2 for parity check below 3270 shlq(tmp3, 1); 3271 jcc(Assembler::carryClear, integer); 3272 jcc(Assembler::notZero, integer); 3273 STOP("integer indefinite value shouldn't be seen here"); 3274 bind(integer); 3275 } 3276 #endif 3277 #endif 3278 3279 // get rid of duplicate arguments. Stack: X^Y 3280 if (num_fpu_regs_in_use > 0) { 3281 fxch(); fpop(); 3282 fxch(); fpop(); 3283 } else { 3284 ffree(2); 3285 ffree(1); 3286 } 3287 3288 testl(tmp2, 1); 3289 jcc(Assembler::zero, done); // X <= 0, Y even: X^Y = abs(X)^Y 3290 // X <= 0, Y even: X^Y = -abs(X)^Y 3291 3292 fchs(); // Stack: -abs(X)^Y Y 3293 jmp(done); 3294 } 3295 3296 // slow case: runtime call 3297 bind(slow_case); 3298 3299 fpop(); // pop incorrect result or int(Y) 3300 3301 fp_runtime_fallback(is_exp ? CAST_FROM_FN_PTR(address, SharedRuntime::dexp) : CAST_FROM_FN_PTR(address, SharedRuntime::dpow), 3302 is_exp ? 1 : 2, num_fpu_regs_in_use); 3303 3304 // Come here with result in F-TOS 3305 bind(done); 3306 } 3307 3308 void MacroAssembler::fpop() { 3309 ffree(); 3310 fincstp(); 3311 } 3312 3313 void MacroAssembler::fremr(Register tmp) { 3314 save_rax(tmp); 3315 { Label L; 3316 bind(L); 3317 fprem(); 3318 fwait(); fnstsw_ax(); 3319 #ifdef _LP64 3320 testl(rax, 0x400); 3321 jcc(Assembler::notEqual, L); 3322 #else 3323 sahf(); 3324 jcc(Assembler::parity, L); 3325 #endif // _LP64 3326 } 3327 restore_rax(tmp); 3328 // Result is in ST0. 3329 // Note: fxch & fpop to get rid of ST1 3330 // (otherwise FPU stack could overflow eventually) 3331 fxch(1); 3332 fpop(); 3333 } 3334 3335 3336 void MacroAssembler::incrementl(AddressLiteral dst) { 3337 if (reachable(dst)) { 3338 incrementl(as_Address(dst)); 3339 } else { 3340 lea(rscratch1, dst); 3341 incrementl(Address(rscratch1, 0)); 3342 } 3343 } 3344 3345 void MacroAssembler::incrementl(ArrayAddress dst) { 3346 incrementl(as_Address(dst)); 3347 } 3348 3349 void MacroAssembler::incrementl(Register reg, int value) { 3350 if (value == min_jint) {addl(reg, value) ; return; } 3351 if (value < 0) { decrementl(reg, -value); return; } 3352 if (value == 0) { ; return; } 3353 if (value == 1 && UseIncDec) { incl(reg) ; return; } 3354 /* else */ { addl(reg, value) ; return; } 3355 } 3356 3357 void MacroAssembler::incrementl(Address dst, int value) { 3358 if (value == min_jint) {addl(dst, value) ; return; } 3359 if (value < 0) { decrementl(dst, -value); return; } 3360 if (value == 0) { ; return; } 3361 if (value == 1 && UseIncDec) { incl(dst) ; return; } 3362 /* else */ { addl(dst, value) ; return; } 3363 } 3364 3365 void MacroAssembler::jump(AddressLiteral dst) { 3366 if (reachable(dst)) { 3367 jmp_literal(dst.target(), dst.rspec()); 3368 } else { 3369 lea(rscratch1, dst); 3370 jmp(rscratch1); 3371 } 3372 } 3373 3374 void MacroAssembler::jump_cc(Condition cc, AddressLiteral dst) { 3375 if (reachable(dst)) { 3376 InstructionMark im(this); 3377 relocate(dst.reloc()); 3378 const int short_size = 2; 3379 const int long_size = 6; 3380 int offs = (intptr_t)dst.target() - ((intptr_t)pc()); 3381 if (dst.reloc() == relocInfo::none && is8bit(offs - short_size)) { 3382 // 0111 tttn #8-bit disp 3383 emit_int8(0x70 | cc); 3384 emit_int8((offs - short_size) & 0xFF); 3385 } else { 3386 // 0000 1111 1000 tttn #32-bit disp 3387 emit_int8(0x0F); 3388 emit_int8((unsigned char)(0x80 | cc)); 3389 emit_int32(offs - long_size); 3390 } 3391 } else { 3392 #ifdef ASSERT 3393 warning("reversing conditional branch"); 3394 #endif /* ASSERT */ 3395 Label skip; 3396 jccb(reverse[cc], skip); 3397 lea(rscratch1, dst); 3398 Assembler::jmp(rscratch1); 3399 bind(skip); 3400 } 3401 } 3402 3403 void MacroAssembler::ldmxcsr(AddressLiteral src) { 3404 if (reachable(src)) { 3405 Assembler::ldmxcsr(as_Address(src)); 3406 } else { 3407 lea(rscratch1, src); 3408 Assembler::ldmxcsr(Address(rscratch1, 0)); 3409 } 3410 } 3411 3412 int MacroAssembler::load_signed_byte(Register dst, Address src) { 3413 int off; 3414 if (LP64_ONLY(true ||) VM_Version::is_P6()) { 3415 off = offset(); 3416 movsbl(dst, src); // movsxb 3417 } else { 3418 off = load_unsigned_byte(dst, src); 3419 shll(dst, 24); 3420 sarl(dst, 24); 3421 } 3422 return off; 3423 } 3424 3425 // Note: load_signed_short used to be called load_signed_word. 3426 // Although the 'w' in x86 opcodes refers to the term "word" in the assembler 3427 // manual, which means 16 bits, that usage is found nowhere in HotSpot code. 3428 // The term "word" in HotSpot means a 32- or 64-bit machine word. 3429 int MacroAssembler::load_signed_short(Register dst, Address src) { 3430 int off; 3431 if (LP64_ONLY(true ||) VM_Version::is_P6()) { 3432 // This is dubious to me since it seems safe to do a signed 16 => 64 bit 3433 // version but this is what 64bit has always done. This seems to imply 3434 // that users are only using 32bits worth. 3435 off = offset(); 3436 movswl(dst, src); // movsxw 3437 } else { 3438 off = load_unsigned_short(dst, src); 3439 shll(dst, 16); 3440 sarl(dst, 16); 3441 } 3442 return off; 3443 } 3444 3445 int MacroAssembler::load_unsigned_byte(Register dst, Address src) { 3446 // According to Intel Doc. AP-526, "Zero-Extension of Short", p.16, 3447 // and "3.9 Partial Register Penalties", p. 22). 3448 int off; 3449 if (LP64_ONLY(true || ) VM_Version::is_P6() || src.uses(dst)) { 3450 off = offset(); 3451 movzbl(dst, src); // movzxb 3452 } else { 3453 xorl(dst, dst); 3454 off = offset(); 3455 movb(dst, src); 3456 } 3457 return off; 3458 } 3459 3460 // Note: load_unsigned_short used to be called load_unsigned_word. 3461 int MacroAssembler::load_unsigned_short(Register dst, Address src) { 3462 // According to Intel Doc. AP-526, "Zero-Extension of Short", p.16, 3463 // and "3.9 Partial Register Penalties", p. 22). 3464 int off; 3465 if (LP64_ONLY(true ||) VM_Version::is_P6() || src.uses(dst)) { 3466 off = offset(); 3467 movzwl(dst, src); // movzxw 3468 } else { 3469 xorl(dst, dst); 3470 off = offset(); 3471 movw(dst, src); 3472 } 3473 return off; 3474 } 3475 3476 void MacroAssembler::load_sized_value(Register dst, Address src, size_t size_in_bytes, bool is_signed, Register dst2) { 3477 switch (size_in_bytes) { 3478 #ifndef _LP64 3479 case 8: 3480 assert(dst2 != noreg, "second dest register required"); 3481 movl(dst, src); 3482 movl(dst2, src.plus_disp(BytesPerInt)); 3483 break; 3484 #else 3485 case 8: movq(dst, src); break; 3486 #endif 3487 case 4: movl(dst, src); break; 3488 case 2: is_signed ? load_signed_short(dst, src) : load_unsigned_short(dst, src); break; 3489 case 1: is_signed ? load_signed_byte( dst, src) : load_unsigned_byte( dst, src); break; 3490 default: ShouldNotReachHere(); 3491 } 3492 } 3493 3494 void MacroAssembler::store_sized_value(Address dst, Register src, size_t size_in_bytes, Register src2) { 3495 switch (size_in_bytes) { 3496 #ifndef _LP64 3497 case 8: 3498 assert(src2 != noreg, "second source register required"); 3499 movl(dst, src); 3500 movl(dst.plus_disp(BytesPerInt), src2); 3501 break; 3502 #else 3503 case 8: movq(dst, src); break; 3504 #endif 3505 case 4: movl(dst, src); break; 3506 case 2: movw(dst, src); break; 3507 case 1: movb(dst, src); break; 3508 default: ShouldNotReachHere(); 3509 } 3510 } 3511 3512 void MacroAssembler::mov32(AddressLiteral dst, Register src) { 3513 if (reachable(dst)) { 3514 movl(as_Address(dst), src); 3515 } else { 3516 lea(rscratch1, dst); 3517 movl(Address(rscratch1, 0), src); 3518 } 3519 } 3520 3521 void MacroAssembler::mov32(Register dst, AddressLiteral src) { 3522 if (reachable(src)) { 3523 movl(dst, as_Address(src)); 3524 } else { 3525 lea(rscratch1, src); 3526 movl(dst, Address(rscratch1, 0)); 3527 } 3528 } 3529 3530 // C++ bool manipulation 3531 3532 void MacroAssembler::movbool(Register dst, Address src) { 3533 if(sizeof(bool) == 1) 3534 movb(dst, src); 3535 else if(sizeof(bool) == 2) 3536 movw(dst, src); 3537 else if(sizeof(bool) == 4) 3538 movl(dst, src); 3539 else 3540 // unsupported 3541 ShouldNotReachHere(); 3542 } 3543 3544 void MacroAssembler::movbool(Address dst, bool boolconst) { 3545 if(sizeof(bool) == 1) 3546 movb(dst, (int) boolconst); 3547 else if(sizeof(bool) == 2) 3548 movw(dst, (int) boolconst); 3549 else if(sizeof(bool) == 4) 3550 movl(dst, (int) boolconst); 3551 else 3552 // unsupported 3553 ShouldNotReachHere(); 3554 } 3555 3556 void MacroAssembler::movbool(Address dst, Register src) { 3557 if(sizeof(bool) == 1) 3558 movb(dst, src); 3559 else if(sizeof(bool) == 2) 3560 movw(dst, src); 3561 else if(sizeof(bool) == 4) 3562 movl(dst, src); 3563 else 3564 // unsupported 3565 ShouldNotReachHere(); 3566 } 3567 3568 void MacroAssembler::movbyte(ArrayAddress dst, int src) { 3569 movb(as_Address(dst), src); 3570 } 3571 3572 void MacroAssembler::movdl(XMMRegister dst, AddressLiteral src) { 3573 if (reachable(src)) { 3574 movdl(dst, as_Address(src)); 3575 } else { 3576 lea(rscratch1, src); 3577 movdl(dst, Address(rscratch1, 0)); 3578 } 3579 } 3580 3581 void MacroAssembler::movq(XMMRegister dst, AddressLiteral src) { 3582 if (reachable(src)) { 3583 movq(dst, as_Address(src)); 3584 } else { 3585 lea(rscratch1, src); 3586 movq(dst, Address(rscratch1, 0)); 3587 } 3588 } 3589 3590 void MacroAssembler::movdbl(XMMRegister dst, AddressLiteral src) { 3591 if (reachable(src)) { 3592 if (UseXmmLoadAndClearUpper) { 3593 movsd (dst, as_Address(src)); 3594 } else { 3595 movlpd(dst, as_Address(src)); 3596 } 3597 } else { 3598 lea(rscratch1, src); 3599 if (UseXmmLoadAndClearUpper) { 3600 movsd (dst, Address(rscratch1, 0)); 3601 } else { 3602 movlpd(dst, Address(rscratch1, 0)); 3603 } 3604 } 3605 } 3606 3607 void MacroAssembler::movflt(XMMRegister dst, AddressLiteral src) { 3608 if (reachable(src)) { 3609 movss(dst, as_Address(src)); 3610 } else { 3611 lea(rscratch1, src); 3612 movss(dst, Address(rscratch1, 0)); 3613 } 3614 } 3615 3616 void MacroAssembler::movptr(Register dst, Register src) { 3617 LP64_ONLY(movq(dst, src)) NOT_LP64(movl(dst, src)); 3618 } 3619 3620 void MacroAssembler::movptr(Register dst, Address src) { 3621 LP64_ONLY(movq(dst, src)) NOT_LP64(movl(dst, src)); 3622 } 3623 3624 // src should NEVER be a real pointer. Use AddressLiteral for true pointers 3625 void MacroAssembler::movptr(Register dst, intptr_t src) { 3626 LP64_ONLY(mov64(dst, src)) NOT_LP64(movl(dst, src)); 3627 } 3628 3629 void MacroAssembler::movptr(Address dst, Register src) { 3630 LP64_ONLY(movq(dst, src)) NOT_LP64(movl(dst, src)); 3631 } 3632 3633 void MacroAssembler::movdqu(XMMRegister dst, AddressLiteral src) { 3634 if (reachable(src)) { 3635 Assembler::movdqu(dst, as_Address(src)); 3636 } else { 3637 lea(rscratch1, src); 3638 Assembler::movdqu(dst, Address(rscratch1, 0)); 3639 } 3640 } 3641 3642 void MacroAssembler::movdqa(XMMRegister dst, AddressLiteral src) { 3643 if (reachable(src)) { 3644 Assembler::movdqa(dst, as_Address(src)); 3645 } else { 3646 lea(rscratch1, src); 3647 Assembler::movdqa(dst, Address(rscratch1, 0)); 3648 } 3649 } 3650 3651 void MacroAssembler::movsd(XMMRegister dst, AddressLiteral src) { 3652 if (reachable(src)) { 3653 Assembler::movsd(dst, as_Address(src)); 3654 } else { 3655 lea(rscratch1, src); 3656 Assembler::movsd(dst, Address(rscratch1, 0)); 3657 } 3658 } 3659 3660 void MacroAssembler::movss(XMMRegister dst, AddressLiteral src) { 3661 if (reachable(src)) { 3662 Assembler::movss(dst, as_Address(src)); 3663 } else { 3664 lea(rscratch1, src); 3665 Assembler::movss(dst, Address(rscratch1, 0)); 3666 } 3667 } 3668 3669 void MacroAssembler::mulsd(XMMRegister dst, AddressLiteral src) { 3670 if (reachable(src)) { 3671 Assembler::mulsd(dst, as_Address(src)); 3672 } else { 3673 lea(rscratch1, src); 3674 Assembler::mulsd(dst, Address(rscratch1, 0)); 3675 } 3676 } 3677 3678 void MacroAssembler::mulss(XMMRegister dst, AddressLiteral src) { 3679 if (reachable(src)) { 3680 Assembler::mulss(dst, as_Address(src)); 3681 } else { 3682 lea(rscratch1, src); 3683 Assembler::mulss(dst, Address(rscratch1, 0)); 3684 } 3685 } 3686 3687 void MacroAssembler::null_check(Register reg, int offset) { 3688 if (needs_explicit_null_check(offset)) { 3689 // provoke OS NULL exception if reg = NULL by 3690 // accessing M[reg] w/o changing any (non-CC) registers 3691 // NOTE: cmpl is plenty here to provoke a segv 3692 cmpptr(rax, Address(reg, 0)); 3693 // Note: should probably use testl(rax, Address(reg, 0)); 3694 // may be shorter code (however, this version of 3695 // testl needs to be implemented first) 3696 } else { 3697 // nothing to do, (later) access of M[reg + offset] 3698 // will provoke OS NULL exception if reg = NULL 3699 } 3700 } 3701 3702 void MacroAssembler::os_breakpoint() { 3703 // instead of directly emitting a breakpoint, call os:breakpoint for better debugability 3704 // (e.g., MSVC can't call ps() otherwise) 3705 call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint))); 3706 } 3707 3708 void MacroAssembler::pop_CPU_state() { 3709 pop_FPU_state(); 3710 pop_IU_state(); 3711 } 3712 3713 void MacroAssembler::pop_FPU_state() { 3714 NOT_LP64(frstor(Address(rsp, 0));) 3715 LP64_ONLY(fxrstor(Address(rsp, 0));) 3716 addptr(rsp, FPUStateSizeInWords * wordSize); 3717 } 3718 3719 void MacroAssembler::pop_IU_state() { 3720 popa(); 3721 LP64_ONLY(addq(rsp, 8)); 3722 popf(); 3723 } 3724 3725 // Save Integer and Float state 3726 // Warning: Stack must be 16 byte aligned (64bit) 3727 void MacroAssembler::push_CPU_state() { 3728 push_IU_state(); 3729 push_FPU_state(); 3730 } 3731 3732 void MacroAssembler::push_FPU_state() { 3733 subptr(rsp, FPUStateSizeInWords * wordSize); 3734 #ifndef _LP64 3735 fnsave(Address(rsp, 0)); 3736 fwait(); 3737 #else 3738 fxsave(Address(rsp, 0)); 3739 #endif // LP64 3740 } 3741 3742 void MacroAssembler::push_IU_state() { 3743 // Push flags first because pusha kills them 3744 pushf(); 3745 // Make sure rsp stays 16-byte aligned 3746 LP64_ONLY(subq(rsp, 8)); 3747 pusha(); 3748 } 3749 3750 void MacroAssembler::reset_last_Java_frame(Register java_thread, bool clear_fp, bool clear_pc) { 3751 // determine java_thread register 3752 if (!java_thread->is_valid()) { 3753 java_thread = rdi; 3754 get_thread(java_thread); 3755 } 3756 // we must set sp to zero to clear frame 3757 movptr(Address(java_thread, JavaThread::last_Java_sp_offset()), NULL_WORD); 3758 if (clear_fp) { 3759 movptr(Address(java_thread, JavaThread::last_Java_fp_offset()), NULL_WORD); 3760 } 3761 3762 if (clear_pc) 3763 movptr(Address(java_thread, JavaThread::last_Java_pc_offset()), NULL_WORD); 3764 3765 } 3766 3767 void MacroAssembler::restore_rax(Register tmp) { 3768 if (tmp == noreg) pop(rax); 3769 else if (tmp != rax) mov(rax, tmp); 3770 } 3771 3772 void MacroAssembler::round_to(Register reg, int modulus) { 3773 addptr(reg, modulus - 1); 3774 andptr(reg, -modulus); 3775 } 3776 3777 void MacroAssembler::save_rax(Register tmp) { 3778 if (tmp == noreg) push(rax); 3779 else if (tmp != rax) mov(tmp, rax); 3780 } 3781 3782 // Write serialization page so VM thread can do a pseudo remote membar. 3783 // We use the current thread pointer to calculate a thread specific 3784 // offset to write to within the page. This minimizes bus traffic 3785 // due to cache line collision. 3786 void MacroAssembler::serialize_memory(Register thread, Register tmp) { 3787 movl(tmp, thread); 3788 shrl(tmp, os::get_serialize_page_shift_count()); 3789 andl(tmp, (os::vm_page_size() - sizeof(int))); 3790 3791 Address index(noreg, tmp, Address::times_1); 3792 ExternalAddress page(os::get_memory_serialize_page()); 3793 3794 // Size of store must match masking code above 3795 movl(as_Address(ArrayAddress(page, index)), tmp); 3796 } 3797 3798 // Calls to C land 3799 // 3800 // When entering C land, the rbp, & rsp of the last Java frame have to be recorded 3801 // in the (thread-local) JavaThread object. When leaving C land, the last Java fp 3802 // has to be reset to 0. This is required to allow proper stack traversal. 3803 void MacroAssembler::set_last_Java_frame(Register java_thread, 3804 Register last_java_sp, 3805 Register last_java_fp, 3806 address last_java_pc) { 3807 // determine java_thread register 3808 if (!java_thread->is_valid()) { 3809 java_thread = rdi; 3810 get_thread(java_thread); 3811 } 3812 // determine last_java_sp register 3813 if (!last_java_sp->is_valid()) { 3814 last_java_sp = rsp; 3815 } 3816 3817 // last_java_fp is optional 3818 3819 if (last_java_fp->is_valid()) { 3820 movptr(Address(java_thread, JavaThread::last_Java_fp_offset()), last_java_fp); 3821 } 3822 3823 // last_java_pc is optional 3824 3825 if (last_java_pc != NULL) { 3826 lea(Address(java_thread, 3827 JavaThread::frame_anchor_offset() + JavaFrameAnchor::last_Java_pc_offset()), 3828 InternalAddress(last_java_pc)); 3829 3830 } 3831 movptr(Address(java_thread, JavaThread::last_Java_sp_offset()), last_java_sp); 3832 } 3833 3834 void MacroAssembler::shlptr(Register dst, int imm8) { 3835 LP64_ONLY(shlq(dst, imm8)) NOT_LP64(shll(dst, imm8)); 3836 } 3837 3838 void MacroAssembler::shrptr(Register dst, int imm8) { 3839 LP64_ONLY(shrq(dst, imm8)) NOT_LP64(shrl(dst, imm8)); 3840 } 3841 3842 void MacroAssembler::sign_extend_byte(Register reg) { 3843 if (LP64_ONLY(true ||) (VM_Version::is_P6() && reg->has_byte_register())) { 3844 movsbl(reg, reg); // movsxb 3845 } else { 3846 shll(reg, 24); 3847 sarl(reg, 24); 3848 } 3849 } 3850 3851 void MacroAssembler::sign_extend_short(Register reg) { 3852 if (LP64_ONLY(true ||) VM_Version::is_P6()) { 3853 movswl(reg, reg); // movsxw 3854 } else { 3855 shll(reg, 16); 3856 sarl(reg, 16); 3857 } 3858 } 3859 3860 void MacroAssembler::testl(Register dst, AddressLiteral src) { 3861 assert(reachable(src), "Address should be reachable"); 3862 testl(dst, as_Address(src)); 3863 } 3864 3865 void MacroAssembler::sqrtsd(XMMRegister dst, AddressLiteral src) { 3866 if (reachable(src)) { 3867 Assembler::sqrtsd(dst, as_Address(src)); 3868 } else { 3869 lea(rscratch1, src); 3870 Assembler::sqrtsd(dst, Address(rscratch1, 0)); 3871 } 3872 } 3873 3874 void MacroAssembler::sqrtss(XMMRegister dst, AddressLiteral src) { 3875 if (reachable(src)) { 3876 Assembler::sqrtss(dst, as_Address(src)); 3877 } else { 3878 lea(rscratch1, src); 3879 Assembler::sqrtss(dst, Address(rscratch1, 0)); 3880 } 3881 } 3882 3883 void MacroAssembler::subsd(XMMRegister dst, AddressLiteral src) { 3884 if (reachable(src)) { 3885 Assembler::subsd(dst, as_Address(src)); 3886 } else { 3887 lea(rscratch1, src); 3888 Assembler::subsd(dst, Address(rscratch1, 0)); 3889 } 3890 } 3891 3892 void MacroAssembler::subss(XMMRegister dst, AddressLiteral src) { 3893 if (reachable(src)) { 3894 Assembler::subss(dst, as_Address(src)); 3895 } else { 3896 lea(rscratch1, src); 3897 Assembler::subss(dst, Address(rscratch1, 0)); 3898 } 3899 } 3900 3901 void MacroAssembler::ucomisd(XMMRegister dst, AddressLiteral src) { 3902 if (reachable(src)) { 3903 Assembler::ucomisd(dst, as_Address(src)); 3904 } else { 3905 lea(rscratch1, src); 3906 Assembler::ucomisd(dst, Address(rscratch1, 0)); 3907 } 3908 } 3909 3910 void MacroAssembler::ucomiss(XMMRegister dst, AddressLiteral src) { 3911 if (reachable(src)) { 3912 Assembler::ucomiss(dst, as_Address(src)); 3913 } else { 3914 lea(rscratch1, src); 3915 Assembler::ucomiss(dst, Address(rscratch1, 0)); 3916 } 3917 } 3918 3919 void MacroAssembler::xorpd(XMMRegister dst, AddressLiteral src) { 3920 // Used in sign-bit flipping with aligned address. 3921 assert((UseAVX > 0) || (((intptr_t)src.target() & 15) == 0), "SSE mode requires address alignment 16 bytes"); 3922 if (reachable(src)) { 3923 Assembler::xorpd(dst, as_Address(src)); 3924 } else { 3925 lea(rscratch1, src); 3926 Assembler::xorpd(dst, Address(rscratch1, 0)); 3927 } 3928 } 3929 3930 void MacroAssembler::xorps(XMMRegister dst, AddressLiteral src) { 3931 // Used in sign-bit flipping with aligned address. 3932 assert((UseAVX > 0) || (((intptr_t)src.target() & 15) == 0), "SSE mode requires address alignment 16 bytes"); 3933 if (reachable(src)) { 3934 Assembler::xorps(dst, as_Address(src)); 3935 } else { 3936 lea(rscratch1, src); 3937 Assembler::xorps(dst, Address(rscratch1, 0)); 3938 } 3939 } 3940 3941 void MacroAssembler::pshufb(XMMRegister dst, AddressLiteral src) { 3942 // Used in sign-bit flipping with aligned address. 3943 bool aligned_adr = (((intptr_t)src.target() & 15) == 0); 3944 assert((UseAVX > 0) || aligned_adr, "SSE mode requires address alignment 16 bytes"); 3945 if (reachable(src)) { 3946 Assembler::pshufb(dst, as_Address(src)); 3947 } else { 3948 lea(rscratch1, src); 3949 Assembler::pshufb(dst, Address(rscratch1, 0)); 3950 } 3951 } 3952 3953 // AVX 3-operands instructions 3954 3955 void MacroAssembler::vaddsd(XMMRegister dst, XMMRegister nds, AddressLiteral src) { 3956 if (reachable(src)) { 3957 vaddsd(dst, nds, as_Address(src)); 3958 } else { 3959 lea(rscratch1, src); 3960 vaddsd(dst, nds, Address(rscratch1, 0)); 3961 } 3962 } 3963 3964 void MacroAssembler::vaddss(XMMRegister dst, XMMRegister nds, AddressLiteral src) { 3965 if (reachable(src)) { 3966 vaddss(dst, nds, as_Address(src)); 3967 } else { 3968 lea(rscratch1, src); 3969 vaddss(dst, nds, Address(rscratch1, 0)); 3970 } 3971 } 3972 3973 void MacroAssembler::vandpd(XMMRegister dst, XMMRegister nds, AddressLiteral src, int vector_len) { 3974 if (reachable(src)) { 3975 vandpd(dst, nds, as_Address(src), vector_len); 3976 } else { 3977 lea(rscratch1, src); 3978 vandpd(dst, nds, Address(rscratch1, 0), vector_len); 3979 } 3980 } 3981 3982 void MacroAssembler::vandps(XMMRegister dst, XMMRegister nds, AddressLiteral src, int vector_len) { 3983 if (reachable(src)) { 3984 vandps(dst, nds, as_Address(src), vector_len); 3985 } else { 3986 lea(rscratch1, src); 3987 vandps(dst, nds, Address(rscratch1, 0), vector_len); 3988 } 3989 } 3990 3991 void MacroAssembler::vdivsd(XMMRegister dst, XMMRegister nds, AddressLiteral src) { 3992 if (reachable(src)) { 3993 vdivsd(dst, nds, as_Address(src)); 3994 } else { 3995 lea(rscratch1, src); 3996 vdivsd(dst, nds, Address(rscratch1, 0)); 3997 } 3998 } 3999 4000 void MacroAssembler::vdivss(XMMRegister dst, XMMRegister nds, AddressLiteral src) { 4001 if (reachable(src)) { 4002 vdivss(dst, nds, as_Address(src)); 4003 } else { 4004 lea(rscratch1, src); 4005 vdivss(dst, nds, Address(rscratch1, 0)); 4006 } 4007 } 4008 4009 void MacroAssembler::vmulsd(XMMRegister dst, XMMRegister nds, AddressLiteral src) { 4010 if (reachable(src)) { 4011 vmulsd(dst, nds, as_Address(src)); 4012 } else { 4013 lea(rscratch1, src); 4014 vmulsd(dst, nds, Address(rscratch1, 0)); 4015 } 4016 } 4017 4018 void MacroAssembler::vmulss(XMMRegister dst, XMMRegister nds, AddressLiteral src) { 4019 if (reachable(src)) { 4020 vmulss(dst, nds, as_Address(src)); 4021 } else { 4022 lea(rscratch1, src); 4023 vmulss(dst, nds, Address(rscratch1, 0)); 4024 } 4025 } 4026 4027 void MacroAssembler::vsubsd(XMMRegister dst, XMMRegister nds, AddressLiteral src) { 4028 if (reachable(src)) { 4029 vsubsd(dst, nds, as_Address(src)); 4030 } else { 4031 lea(rscratch1, src); 4032 vsubsd(dst, nds, Address(rscratch1, 0)); 4033 } 4034 } 4035 4036 void MacroAssembler::vsubss(XMMRegister dst, XMMRegister nds, AddressLiteral src) { 4037 if (reachable(src)) { 4038 vsubss(dst, nds, as_Address(src)); 4039 } else { 4040 lea(rscratch1, src); 4041 vsubss(dst, nds, Address(rscratch1, 0)); 4042 } 4043 } 4044 4045 void MacroAssembler::vxorpd(XMMRegister dst, XMMRegister nds, AddressLiteral src, int vector_len) { 4046 if (reachable(src)) { 4047 vxorpd(dst, nds, as_Address(src), vector_len); 4048 } else { 4049 lea(rscratch1, src); 4050 vxorpd(dst, nds, Address(rscratch1, 0), vector_len); 4051 } 4052 } 4053 4054 void MacroAssembler::vxorps(XMMRegister dst, XMMRegister nds, AddressLiteral src, int vector_len) { 4055 if (reachable(src)) { 4056 vxorps(dst, nds, as_Address(src), vector_len); 4057 } else { 4058 lea(rscratch1, src); 4059 vxorps(dst, nds, Address(rscratch1, 0), vector_len); 4060 } 4061 } 4062 4063 4064 ////////////////////////////////////////////////////////////////////////////////// 4065 #if INCLUDE_ALL_GCS 4066 4067 void MacroAssembler::g1_write_barrier_pre(Register obj, 4068 Register pre_val, 4069 Register thread, 4070 Register tmp, 4071 bool tosca_live, 4072 bool expand_call) { 4073 4074 // If expand_call is true then we expand the call_VM_leaf macro 4075 // directly to skip generating the check by 4076 // InterpreterMacroAssembler::call_VM_leaf_base that checks _last_sp. 4077 4078 #ifdef _LP64 4079 assert(thread == r15_thread, "must be"); 4080 #endif // _LP64 4081 4082 Label done; 4083 Label runtime; 4084 4085 assert(pre_val != noreg, "check this code"); 4086 4087 if (obj != noreg) { 4088 assert_different_registers(obj, pre_val, tmp); 4089 assert(pre_val != rax, "check this code"); 4090 } 4091 4092 Address in_progress(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 4093 PtrQueue::byte_offset_of_active())); 4094 Address index(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 4095 PtrQueue::byte_offset_of_index())); 4096 Address buffer(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 4097 PtrQueue::byte_offset_of_buf())); 4098 4099 4100 // Is marking active? 4101 if (in_bytes(PtrQueue::byte_width_of_active()) == 4) { 4102 cmpl(in_progress, 0); 4103 } else { 4104 assert(in_bytes(PtrQueue::byte_width_of_active()) == 1, "Assumption"); 4105 cmpb(in_progress, 0); 4106 } 4107 jcc(Assembler::equal, done); 4108 4109 // Do we need to load the previous value? 4110 if (obj != noreg) { 4111 load_heap_oop(pre_val, Address(obj, 0)); 4112 } 4113 4114 // Is the previous value null? 4115 cmpptr(pre_val, (int32_t) NULL_WORD); 4116 jcc(Assembler::equal, done); 4117 4118 // Can we store original value in the thread's buffer? 4119 // Is index == 0? 4120 // (The index field is typed as size_t.) 4121 4122 movptr(tmp, index); // tmp := *index_adr 4123 cmpptr(tmp, 0); // tmp == 0? 4124 jcc(Assembler::equal, runtime); // If yes, goto runtime 4125 4126 subptr(tmp, wordSize); // tmp := tmp - wordSize 4127 movptr(index, tmp); // *index_adr := tmp 4128 addptr(tmp, buffer); // tmp := tmp + *buffer_adr 4129 4130 // Record the previous value 4131 movptr(Address(tmp, 0), pre_val); 4132 jmp(done); 4133 4134 bind(runtime); 4135 // save the live input values 4136 if(tosca_live) push(rax); 4137 4138 if (obj != noreg && obj != rax) 4139 push(obj); 4140 4141 if (pre_val != rax) 4142 push(pre_val); 4143 4144 // Calling the runtime using the regular call_VM_leaf mechanism generates 4145 // code (generated by InterpreterMacroAssember::call_VM_leaf_base) 4146 // that checks that the *(ebp+frame::interpreter_frame_last_sp) == NULL. 4147 // 4148 // If we care generating the pre-barrier without a frame (e.g. in the 4149 // intrinsified Reference.get() routine) then ebp might be pointing to 4150 // the caller frame and so this check will most likely fail at runtime. 4151 // 4152 // Expanding the call directly bypasses the generation of the check. 4153 // So when we do not have have a full interpreter frame on the stack 4154 // expand_call should be passed true. 4155 4156 NOT_LP64( push(thread); ) 4157 4158 if (expand_call) { 4159 LP64_ONLY( assert(pre_val != c_rarg1, "smashed arg"); ) 4160 pass_arg1(this, thread); 4161 pass_arg0(this, pre_val); 4162 MacroAssembler::call_VM_leaf_base(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), 2); 4163 } else { 4164 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), pre_val, thread); 4165 } 4166 4167 NOT_LP64( pop(thread); ) 4168 4169 // save the live input values 4170 if (pre_val != rax) 4171 pop(pre_val); 4172 4173 if (obj != noreg && obj != rax) 4174 pop(obj); 4175 4176 if(tosca_live) pop(rax); 4177 4178 bind(done); 4179 } 4180 4181 void MacroAssembler::g1_write_barrier_post(Register store_addr, 4182 Register new_val, 4183 Register thread, 4184 Register tmp, 4185 Register tmp2) { 4186 #ifdef _LP64 4187 assert(thread == r15_thread, "must be"); 4188 #endif // _LP64 4189 4190 Address queue_index(thread, in_bytes(JavaThread::dirty_card_queue_offset() + 4191 PtrQueue::byte_offset_of_index())); 4192 Address buffer(thread, in_bytes(JavaThread::dirty_card_queue_offset() + 4193 PtrQueue::byte_offset_of_buf())); 4194 4195 CardTableModRefBS* ct = 4196 barrier_set_cast<CardTableModRefBS>(Universe::heap()->barrier_set()); 4197 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); 4198 4199 Label done; 4200 Label runtime; 4201 4202 // Does store cross heap regions? 4203 4204 movptr(tmp, store_addr); 4205 xorptr(tmp, new_val); 4206 shrptr(tmp, HeapRegion::LogOfHRGrainBytes); 4207 jcc(Assembler::equal, done); 4208 4209 // crosses regions, storing NULL? 4210 4211 cmpptr(new_val, (int32_t) NULL_WORD); 4212 jcc(Assembler::equal, done); 4213 4214 // storing region crossing non-NULL, is card already dirty? 4215 4216 const Register card_addr = tmp; 4217 const Register cardtable = tmp2; 4218 4219 movptr(card_addr, store_addr); 4220 shrptr(card_addr, CardTableModRefBS::card_shift); 4221 // Do not use ExternalAddress to load 'byte_map_base', since 'byte_map_base' is NOT 4222 // a valid address and therefore is not properly handled by the relocation code. 4223 movptr(cardtable, (intptr_t)ct->byte_map_base); 4224 addptr(card_addr, cardtable); 4225 4226 if (G1ElideMembar) { 4227 cmpb(Address(card_addr, 0), (int)CardTableModRefBS::clean_card_val()); 4228 jcc(Assembler::notEqual, done); 4229 } else { 4230 cmpb(Address(card_addr, 0), (int)G1SATBCardTableModRefBS::g1_young_card_val()); 4231 jcc(Assembler::equal, done); 4232 4233 membar(Assembler::Membar_mask_bits(Assembler::StoreLoad)); 4234 cmpb(Address(card_addr, 0), (int)CardTableModRefBS::dirty_card_val()); 4235 jcc(Assembler::equal, done); 4236 } 4237 4238 // storing a region crossing, non-NULL oop, card is clean. 4239 // dirty card and log. 4240 4241 movb(Address(card_addr, 0), (int)CardTableModRefBS::dirty_card_val()); 4242 4243 cmpl(queue_index, 0); 4244 jcc(Assembler::equal, runtime); 4245 subl(queue_index, wordSize); 4246 movptr(tmp2, buffer); 4247 #ifdef _LP64 4248 movslq(rscratch1, queue_index); 4249 addq(tmp2, rscratch1); 4250 movq(Address(tmp2, 0), card_addr); 4251 #else 4252 addl(tmp2, queue_index); 4253 movl(Address(tmp2, 0), card_addr); 4254 #endif 4255 jmp(done); 4256 4257 bind(runtime); 4258 // save the live input values 4259 push(store_addr); 4260 push(new_val); 4261 #ifdef _LP64 4262 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), card_addr, r15_thread); 4263 #else 4264 push(thread); 4265 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), card_addr, thread); 4266 pop(thread); 4267 #endif 4268 pop(new_val); 4269 pop(store_addr); 4270 4271 bind(done); 4272 } 4273 4274 #endif // INCLUDE_ALL_GCS 4275 ////////////////////////////////////////////////////////////////////////////////// 4276 4277 4278 void MacroAssembler::store_check(Register obj, Address dst) { 4279 store_check(obj); 4280 } 4281 4282 void MacroAssembler::store_check(Register obj) { 4283 // Does a store check for the oop in register obj. The content of 4284 // register obj is destroyed afterwards. 4285 4286 BarrierSet* bs = Universe::heap()->barrier_set(); 4287 assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind"); 4288 4289 CardTableModRefBS* ct = barrier_set_cast<CardTableModRefBS>(bs); 4290 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); 4291 4292 shrptr(obj, CardTableModRefBS::card_shift); 4293 4294 Address card_addr; 4295 4296 // The calculation for byte_map_base is as follows: 4297 // byte_map_base = _byte_map - (uintptr_t(low_bound) >> card_shift); 4298 // So this essentially converts an address to a displacement and it will 4299 // never need to be relocated. On 64bit however the value may be too 4300 // large for a 32bit displacement. 4301 intptr_t disp = (intptr_t) ct->byte_map_base; 4302 if (is_simm32(disp)) { 4303 card_addr = Address(noreg, obj, Address::times_1, disp); 4304 } else { 4305 // By doing it as an ExternalAddress 'disp' could be converted to a rip-relative 4306 // displacement and done in a single instruction given favorable mapping and a 4307 // smarter version of as_Address. However, 'ExternalAddress' generates a relocation 4308 // entry and that entry is not properly handled by the relocation code. 4309 AddressLiteral cardtable((address)ct->byte_map_base, relocInfo::none); 4310 Address index(noreg, obj, Address::times_1); 4311 card_addr = as_Address(ArrayAddress(cardtable, index)); 4312 } 4313 4314 int dirty = CardTableModRefBS::dirty_card_val(); 4315 if (UseCondCardMark) { 4316 Label L_already_dirty; 4317 if (UseConcMarkSweepGC) { 4318 membar(Assembler::StoreLoad); 4319 } 4320 cmpb(card_addr, dirty); 4321 jcc(Assembler::equal, L_already_dirty); 4322 movb(card_addr, dirty); 4323 bind(L_already_dirty); 4324 } else { 4325 movb(card_addr, dirty); 4326 } 4327 } 4328 4329 void MacroAssembler::subptr(Register dst, int32_t imm32) { 4330 LP64_ONLY(subq(dst, imm32)) NOT_LP64(subl(dst, imm32)); 4331 } 4332 4333 // Force generation of a 4 byte immediate value even if it fits into 8bit 4334 void MacroAssembler::subptr_imm32(Register dst, int32_t imm32) { 4335 LP64_ONLY(subq_imm32(dst, imm32)) NOT_LP64(subl_imm32(dst, imm32)); 4336 } 4337 4338 void MacroAssembler::subptr(Register dst, Register src) { 4339 LP64_ONLY(subq(dst, src)) NOT_LP64(subl(dst, src)); 4340 } 4341 4342 // C++ bool manipulation 4343 void MacroAssembler::testbool(Register dst) { 4344 if(sizeof(bool) == 1) 4345 testb(dst, 0xff); 4346 else if(sizeof(bool) == 2) { 4347 // testw implementation needed for two byte bools 4348 ShouldNotReachHere(); 4349 } else if(sizeof(bool) == 4) 4350 testl(dst, dst); 4351 else 4352 // unsupported 4353 ShouldNotReachHere(); 4354 } 4355 4356 void MacroAssembler::testptr(Register dst, Register src) { 4357 LP64_ONLY(testq(dst, src)) NOT_LP64(testl(dst, src)); 4358 } 4359 4360 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes. 4361 void MacroAssembler::tlab_allocate(Register obj, 4362 Register var_size_in_bytes, 4363 int con_size_in_bytes, 4364 Register t1, 4365 Register t2, 4366 Label& slow_case) { 4367 assert_different_registers(obj, t1, t2); 4368 assert_different_registers(obj, var_size_in_bytes, t1); 4369 Register end = t2; 4370 Register thread = NOT_LP64(t1) LP64_ONLY(r15_thread); 4371 4372 verify_tlab(); 4373 4374 NOT_LP64(get_thread(thread)); 4375 4376 movptr(obj, Address(thread, JavaThread::tlab_top_offset())); 4377 if (var_size_in_bytes == noreg) { 4378 lea(end, Address(obj, con_size_in_bytes)); 4379 } else { 4380 lea(end, Address(obj, var_size_in_bytes, Address::times_1)); 4381 } 4382 cmpptr(end, Address(thread, JavaThread::tlab_end_offset())); 4383 jcc(Assembler::above, slow_case); 4384 4385 // update the tlab top pointer 4386 movptr(Address(thread, JavaThread::tlab_top_offset()), end); 4387 4388 // recover var_size_in_bytes if necessary 4389 if (var_size_in_bytes == end) { 4390 subptr(var_size_in_bytes, obj); 4391 } 4392 verify_tlab(); 4393 } 4394 4395 // Preserves rbx, and rdx. 4396 Register MacroAssembler::tlab_refill(Label& retry, 4397 Label& try_eden, 4398 Label& slow_case) { 4399 Register top = rax; 4400 Register t1 = rcx; 4401 Register t2 = rsi; 4402 Register thread_reg = NOT_LP64(rdi) LP64_ONLY(r15_thread); 4403 assert_different_registers(top, thread_reg, t1, t2, /* preserve: */ rbx, rdx); 4404 Label do_refill, discard_tlab; 4405 4406 if (!Universe::heap()->supports_inline_contig_alloc()) { 4407 // No allocation in the shared eden. 4408 jmp(slow_case); 4409 } 4410 4411 NOT_LP64(get_thread(thread_reg)); 4412 4413 movptr(top, Address(thread_reg, in_bytes(JavaThread::tlab_top_offset()))); 4414 movptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_end_offset()))); 4415 4416 // calculate amount of free space 4417 subptr(t1, top); 4418 shrptr(t1, LogHeapWordSize); 4419 4420 // Retain tlab and allocate object in shared space if 4421 // the amount free in the tlab is too large to discard. 4422 cmpptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_refill_waste_limit_offset()))); 4423 jcc(Assembler::lessEqual, discard_tlab); 4424 4425 // Retain 4426 // %%% yuck as movptr... 4427 movptr(t2, (int32_t) ThreadLocalAllocBuffer::refill_waste_limit_increment()); 4428 addptr(Address(thread_reg, in_bytes(JavaThread::tlab_refill_waste_limit_offset())), t2); 4429 if (TLABStats) { 4430 // increment number of slow_allocations 4431 addl(Address(thread_reg, in_bytes(JavaThread::tlab_slow_allocations_offset())), 1); 4432 } 4433 jmp(try_eden); 4434 4435 bind(discard_tlab); 4436 if (TLABStats) { 4437 // increment number of refills 4438 addl(Address(thread_reg, in_bytes(JavaThread::tlab_number_of_refills_offset())), 1); 4439 // accumulate wastage -- t1 is amount free in tlab 4440 addl(Address(thread_reg, in_bytes(JavaThread::tlab_fast_refill_waste_offset())), t1); 4441 } 4442 4443 // if tlab is currently allocated (top or end != null) then 4444 // fill [top, end + alignment_reserve) with array object 4445 testptr(top, top); 4446 jcc(Assembler::zero, do_refill); 4447 4448 // set up the mark word 4449 movptr(Address(top, oopDesc::mark_offset_in_bytes()), (intptr_t)markOopDesc::prototype()->copy_set_hash(0x2)); 4450 // set the length to the remaining space 4451 subptr(t1, typeArrayOopDesc::header_size(T_INT)); 4452 addptr(t1, (int32_t)ThreadLocalAllocBuffer::alignment_reserve()); 4453 shlptr(t1, log2_intptr(HeapWordSize/sizeof(jint))); 4454 movl(Address(top, arrayOopDesc::length_offset_in_bytes()), t1); 4455 // set klass to intArrayKlass 4456 // dubious reloc why not an oop reloc? 4457 movptr(t1, ExternalAddress((address)Universe::intArrayKlassObj_addr())); 4458 // store klass last. concurrent gcs assumes klass length is valid if 4459 // klass field is not null. 4460 store_klass(top, t1); 4461 4462 movptr(t1, top); 4463 subptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_start_offset()))); 4464 incr_allocated_bytes(thread_reg, t1, 0); 4465 4466 // refill the tlab with an eden allocation 4467 bind(do_refill); 4468 movptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_size_offset()))); 4469 shlptr(t1, LogHeapWordSize); 4470 // allocate new tlab, address returned in top 4471 eden_allocate(top, t1, 0, t2, slow_case); 4472 4473 // Check that t1 was preserved in eden_allocate. 4474 #ifdef ASSERT 4475 if (UseTLAB) { 4476 Label ok; 4477 Register tsize = rsi; 4478 assert_different_registers(tsize, thread_reg, t1); 4479 push(tsize); 4480 movptr(tsize, Address(thread_reg, in_bytes(JavaThread::tlab_size_offset()))); 4481 shlptr(tsize, LogHeapWordSize); 4482 cmpptr(t1, tsize); 4483 jcc(Assembler::equal, ok); 4484 STOP("assert(t1 != tlab size)"); 4485 should_not_reach_here(); 4486 4487 bind(ok); 4488 pop(tsize); 4489 } 4490 #endif 4491 movptr(Address(thread_reg, in_bytes(JavaThread::tlab_start_offset())), top); 4492 movptr(Address(thread_reg, in_bytes(JavaThread::tlab_top_offset())), top); 4493 addptr(top, t1); 4494 subptr(top, (int32_t)ThreadLocalAllocBuffer::alignment_reserve_in_bytes()); 4495 movptr(Address(thread_reg, in_bytes(JavaThread::tlab_end_offset())), top); 4496 verify_tlab(); 4497 jmp(retry); 4498 4499 return thread_reg; // for use by caller 4500 } 4501 4502 void MacroAssembler::incr_allocated_bytes(Register thread, 4503 Register var_size_in_bytes, 4504 int con_size_in_bytes, 4505 Register t1) { 4506 if (!thread->is_valid()) { 4507 #ifdef _LP64 4508 thread = r15_thread; 4509 #else 4510 assert(t1->is_valid(), "need temp reg"); 4511 thread = t1; 4512 get_thread(thread); 4513 #endif 4514 } 4515 4516 #ifdef _LP64 4517 if (var_size_in_bytes->is_valid()) { 4518 addq(Address(thread, in_bytes(JavaThread::allocated_bytes_offset())), var_size_in_bytes); 4519 } else { 4520 addq(Address(thread, in_bytes(JavaThread::allocated_bytes_offset())), con_size_in_bytes); 4521 } 4522 #else 4523 if (var_size_in_bytes->is_valid()) { 4524 addl(Address(thread, in_bytes(JavaThread::allocated_bytes_offset())), var_size_in_bytes); 4525 } else { 4526 addl(Address(thread, in_bytes(JavaThread::allocated_bytes_offset())), con_size_in_bytes); 4527 } 4528 adcl(Address(thread, in_bytes(JavaThread::allocated_bytes_offset())+4), 0); 4529 #endif 4530 } 4531 4532 void MacroAssembler::fp_runtime_fallback(address runtime_entry, int nb_args, int num_fpu_regs_in_use) { 4533 pusha(); 4534 4535 // if we are coming from c1, xmm registers may be live 4536 int off = 0; 4537 if (UseSSE == 1) { 4538 subptr(rsp, sizeof(jdouble)*8); 4539 movflt(Address(rsp,off++*sizeof(jdouble)),xmm0); 4540 movflt(Address(rsp,off++*sizeof(jdouble)),xmm1); 4541 movflt(Address(rsp,off++*sizeof(jdouble)),xmm2); 4542 movflt(Address(rsp,off++*sizeof(jdouble)),xmm3); 4543 movflt(Address(rsp,off++*sizeof(jdouble)),xmm4); 4544 movflt(Address(rsp,off++*sizeof(jdouble)),xmm5); 4545 movflt(Address(rsp,off++*sizeof(jdouble)),xmm6); 4546 movflt(Address(rsp,off++*sizeof(jdouble)),xmm7); 4547 } else if (UseSSE >= 2) { 4548 if (UseAVX > 2) { 4549 movl(rbx, 0xffff); 4550 #ifdef _LP64 4551 kmovql(k1, rbx); 4552 #else 4553 kmovdl(k1, rbx); 4554 #endif 4555 } 4556 #ifdef COMPILER2 4557 if (MaxVectorSize > 16) { 4558 assert(UseAVX > 0, "256bit vectors are supported only with AVX"); 4559 // Save upper half of YMM registes 4560 subptr(rsp, 16 * LP64_ONLY(16) NOT_LP64(8)); 4561 vextractf128h(Address(rsp, 0),xmm0); 4562 vextractf128h(Address(rsp, 16),xmm1); 4563 vextractf128h(Address(rsp, 32),xmm2); 4564 vextractf128h(Address(rsp, 48),xmm3); 4565 vextractf128h(Address(rsp, 64),xmm4); 4566 vextractf128h(Address(rsp, 80),xmm5); 4567 vextractf128h(Address(rsp, 96),xmm6); 4568 vextractf128h(Address(rsp,112),xmm7); 4569 #ifdef _LP64 4570 vextractf128h(Address(rsp,128),xmm8); 4571 vextractf128h(Address(rsp,144),xmm9); 4572 vextractf128h(Address(rsp,160),xmm10); 4573 vextractf128h(Address(rsp,176),xmm11); 4574 vextractf128h(Address(rsp,192),xmm12); 4575 vextractf128h(Address(rsp,208),xmm13); 4576 vextractf128h(Address(rsp,224),xmm14); 4577 vextractf128h(Address(rsp,240),xmm15); 4578 #endif 4579 } 4580 #endif 4581 // Save whole 128bit (16 bytes) XMM regiters 4582 subptr(rsp, 16 * LP64_ONLY(16) NOT_LP64(8)); 4583 movdqu(Address(rsp,off++*16),xmm0); 4584 movdqu(Address(rsp,off++*16),xmm1); 4585 movdqu(Address(rsp,off++*16),xmm2); 4586 movdqu(Address(rsp,off++*16),xmm3); 4587 movdqu(Address(rsp,off++*16),xmm4); 4588 movdqu(Address(rsp,off++*16),xmm5); 4589 movdqu(Address(rsp,off++*16),xmm6); 4590 movdqu(Address(rsp,off++*16),xmm7); 4591 #ifdef _LP64 4592 movdqu(Address(rsp,off++*16),xmm8); 4593 movdqu(Address(rsp,off++*16),xmm9); 4594 movdqu(Address(rsp,off++*16),xmm10); 4595 movdqu(Address(rsp,off++*16),xmm11); 4596 movdqu(Address(rsp,off++*16),xmm12); 4597 movdqu(Address(rsp,off++*16),xmm13); 4598 movdqu(Address(rsp,off++*16),xmm14); 4599 movdqu(Address(rsp,off++*16),xmm15); 4600 #endif 4601 } 4602 4603 // Preserve registers across runtime call 4604 int incoming_argument_and_return_value_offset = -1; 4605 if (num_fpu_regs_in_use > 1) { 4606 // Must preserve all other FPU regs (could alternatively convert 4607 // SharedRuntime::dsin, dcos etc. into assembly routines known not to trash 4608 // FPU state, but can not trust C compiler) 4609 NEEDS_CLEANUP; 4610 // NOTE that in this case we also push the incoming argument(s) to 4611 // the stack and restore it later; we also use this stack slot to 4612 // hold the return value from dsin, dcos etc. 4613 for (int i = 0; i < num_fpu_regs_in_use; i++) { 4614 subptr(rsp, sizeof(jdouble)); 4615 fstp_d(Address(rsp, 0)); 4616 } 4617 incoming_argument_and_return_value_offset = sizeof(jdouble)*(num_fpu_regs_in_use-1); 4618 for (int i = nb_args-1; i >= 0; i--) { 4619 fld_d(Address(rsp, incoming_argument_and_return_value_offset-i*sizeof(jdouble))); 4620 } 4621 } 4622 4623 subptr(rsp, nb_args*sizeof(jdouble)); 4624 for (int i = 0; i < nb_args; i++) { 4625 fstp_d(Address(rsp, i*sizeof(jdouble))); 4626 } 4627 4628 #ifdef _LP64 4629 if (nb_args > 0) { 4630 movdbl(xmm0, Address(rsp, 0)); 4631 } 4632 if (nb_args > 1) { 4633 movdbl(xmm1, Address(rsp, sizeof(jdouble))); 4634 } 4635 assert(nb_args <= 2, "unsupported number of args"); 4636 #endif // _LP64 4637 4638 // NOTE: we must not use call_VM_leaf here because that requires a 4639 // complete interpreter frame in debug mode -- same bug as 4387334 4640 // MacroAssembler::call_VM_leaf_base is perfectly safe and will 4641 // do proper 64bit abi 4642 4643 NEEDS_CLEANUP; 4644 // Need to add stack banging before this runtime call if it needs to 4645 // be taken; however, there is no generic stack banging routine at 4646 // the MacroAssembler level 4647 4648 MacroAssembler::call_VM_leaf_base(runtime_entry, 0); 4649 4650 #ifdef _LP64 4651 movsd(Address(rsp, 0), xmm0); 4652 fld_d(Address(rsp, 0)); 4653 #endif // _LP64 4654 addptr(rsp, sizeof(jdouble) * nb_args); 4655 if (num_fpu_regs_in_use > 1) { 4656 // Must save return value to stack and then restore entire FPU 4657 // stack except incoming arguments 4658 fstp_d(Address(rsp, incoming_argument_and_return_value_offset)); 4659 for (int i = 0; i < num_fpu_regs_in_use - nb_args; i++) { 4660 fld_d(Address(rsp, 0)); 4661 addptr(rsp, sizeof(jdouble)); 4662 } 4663 fld_d(Address(rsp, (nb_args-1)*sizeof(jdouble))); 4664 addptr(rsp, sizeof(jdouble) * nb_args); 4665 } 4666 4667 off = 0; 4668 if (UseSSE == 1) { 4669 movflt(xmm0, Address(rsp,off++*sizeof(jdouble))); 4670 movflt(xmm1, Address(rsp,off++*sizeof(jdouble))); 4671 movflt(xmm2, Address(rsp,off++*sizeof(jdouble))); 4672 movflt(xmm3, Address(rsp,off++*sizeof(jdouble))); 4673 movflt(xmm4, Address(rsp,off++*sizeof(jdouble))); 4674 movflt(xmm5, Address(rsp,off++*sizeof(jdouble))); 4675 movflt(xmm6, Address(rsp,off++*sizeof(jdouble))); 4676 movflt(xmm7, Address(rsp,off++*sizeof(jdouble))); 4677 addptr(rsp, sizeof(jdouble)*8); 4678 } else if (UseSSE >= 2) { 4679 // Restore whole 128bit (16 bytes) XMM regiters 4680 movdqu(xmm0, Address(rsp,off++*16)); 4681 movdqu(xmm1, Address(rsp,off++*16)); 4682 movdqu(xmm2, Address(rsp,off++*16)); 4683 movdqu(xmm3, Address(rsp,off++*16)); 4684 movdqu(xmm4, Address(rsp,off++*16)); 4685 movdqu(xmm5, Address(rsp,off++*16)); 4686 movdqu(xmm6, Address(rsp,off++*16)); 4687 movdqu(xmm7, Address(rsp,off++*16)); 4688 #ifdef _LP64 4689 movdqu(xmm8, Address(rsp,off++*16)); 4690 movdqu(xmm9, Address(rsp,off++*16)); 4691 movdqu(xmm10, Address(rsp,off++*16)); 4692 movdqu(xmm11, Address(rsp,off++*16)); 4693 movdqu(xmm12, Address(rsp,off++*16)); 4694 movdqu(xmm13, Address(rsp,off++*16)); 4695 movdqu(xmm14, Address(rsp,off++*16)); 4696 movdqu(xmm15, Address(rsp,off++*16)); 4697 #endif 4698 addptr(rsp, 16 * LP64_ONLY(16) NOT_LP64(8)); 4699 #ifdef COMPILER2 4700 if (MaxVectorSize > 16) { 4701 // Restore upper half of YMM registes. 4702 vinsertf128h(xmm0, Address(rsp, 0)); 4703 vinsertf128h(xmm1, Address(rsp, 16)); 4704 vinsertf128h(xmm2, Address(rsp, 32)); 4705 vinsertf128h(xmm3, Address(rsp, 48)); 4706 vinsertf128h(xmm4, Address(rsp, 64)); 4707 vinsertf128h(xmm5, Address(rsp, 80)); 4708 vinsertf128h(xmm6, Address(rsp, 96)); 4709 vinsertf128h(xmm7, Address(rsp,112)); 4710 #ifdef _LP64 4711 vinsertf128h(xmm8, Address(rsp,128)); 4712 vinsertf128h(xmm9, Address(rsp,144)); 4713 vinsertf128h(xmm10, Address(rsp,160)); 4714 vinsertf128h(xmm11, Address(rsp,176)); 4715 vinsertf128h(xmm12, Address(rsp,192)); 4716 vinsertf128h(xmm13, Address(rsp,208)); 4717 vinsertf128h(xmm14, Address(rsp,224)); 4718 vinsertf128h(xmm15, Address(rsp,240)); 4719 #endif 4720 addptr(rsp, 16 * LP64_ONLY(16) NOT_LP64(8)); 4721 } 4722 #endif 4723 } 4724 popa(); 4725 } 4726 4727 static const double pi_4 = 0.7853981633974483; 4728 4729 void MacroAssembler::trigfunc(char trig, int num_fpu_regs_in_use) { 4730 // A hand-coded argument reduction for values in fabs(pi/4, pi/2) 4731 // was attempted in this code; unfortunately it appears that the 4732 // switch to 80-bit precision and back causes this to be 4733 // unprofitable compared with simply performing a runtime call if 4734 // the argument is out of the (-pi/4, pi/4) range. 4735 4736 Register tmp = noreg; 4737 if (!VM_Version::supports_cmov()) { 4738 // fcmp needs a temporary so preserve rbx, 4739 tmp = rbx; 4740 push(tmp); 4741 } 4742 4743 Label slow_case, done; 4744 4745 ExternalAddress pi4_adr = (address)&pi_4; 4746 if (reachable(pi4_adr)) { 4747 // x ?<= pi/4 4748 fld_d(pi4_adr); 4749 fld_s(1); // Stack: X PI/4 X 4750 fabs(); // Stack: |X| PI/4 X 4751 fcmp(tmp); 4752 jcc(Assembler::above, slow_case); 4753 4754 // fastest case: -pi/4 <= x <= pi/4 4755 switch(trig) { 4756 case 's': 4757 fsin(); 4758 break; 4759 case 'c': 4760 fcos(); 4761 break; 4762 case 't': 4763 ftan(); 4764 break; 4765 default: 4766 assert(false, "bad intrinsic"); 4767 break; 4768 } 4769 jmp(done); 4770 } 4771 4772 // slow case: runtime call 4773 bind(slow_case); 4774 4775 switch(trig) { 4776 case 's': 4777 { 4778 fp_runtime_fallback(CAST_FROM_FN_PTR(address, SharedRuntime::dsin), 1, num_fpu_regs_in_use); 4779 } 4780 break; 4781 case 'c': 4782 { 4783 fp_runtime_fallback(CAST_FROM_FN_PTR(address, SharedRuntime::dcos), 1, num_fpu_regs_in_use); 4784 } 4785 break; 4786 case 't': 4787 { 4788 fp_runtime_fallback(CAST_FROM_FN_PTR(address, SharedRuntime::dtan), 1, num_fpu_regs_in_use); 4789 } 4790 break; 4791 default: 4792 assert(false, "bad intrinsic"); 4793 break; 4794 } 4795 4796 // Come here with result in F-TOS 4797 bind(done); 4798 4799 if (tmp != noreg) { 4800 pop(tmp); 4801 } 4802 } 4803 4804 4805 // Look up the method for a megamorphic invokeinterface call. 4806 // The target method is determined by <intf_klass, itable_index>. 4807 // The receiver klass is in recv_klass. 4808 // On success, the result will be in method_result, and execution falls through. 4809 // On failure, execution transfers to the given label. 4810 void MacroAssembler::lookup_interface_method(Register recv_klass, 4811 Register intf_klass, 4812 RegisterOrConstant itable_index, 4813 Register method_result, 4814 Register scan_temp, 4815 Label& L_no_such_interface) { 4816 assert_different_registers(recv_klass, intf_klass, method_result, scan_temp); 4817 assert(itable_index.is_constant() || itable_index.as_register() == method_result, 4818 "caller must use same register for non-constant itable index as for method"); 4819 4820 // Compute start of first itableOffsetEntry (which is at the end of the vtable) 4821 int vtable_base = InstanceKlass::vtable_start_offset() * wordSize; 4822 int itentry_off = itableMethodEntry::method_offset_in_bytes(); 4823 int scan_step = itableOffsetEntry::size() * wordSize; 4824 int vte_size = vtableEntry::size() * wordSize; 4825 Address::ScaleFactor times_vte_scale = Address::times_ptr; 4826 assert(vte_size == wordSize, "else adjust times_vte_scale"); 4827 4828 movl(scan_temp, Address(recv_klass, InstanceKlass::vtable_length_offset() * wordSize)); 4829 4830 // %%% Could store the aligned, prescaled offset in the klassoop. 4831 lea(scan_temp, Address(recv_klass, scan_temp, times_vte_scale, vtable_base)); 4832 if (HeapWordsPerLong > 1) { 4833 // Round up to align_object_offset boundary 4834 // see code for InstanceKlass::start_of_itable! 4835 round_to(scan_temp, BytesPerLong); 4836 } 4837 4838 // Adjust recv_klass by scaled itable_index, so we can free itable_index. 4839 assert(itableMethodEntry::size() * wordSize == wordSize, "adjust the scaling in the code below"); 4840 lea(recv_klass, Address(recv_klass, itable_index, Address::times_ptr, itentry_off)); 4841 4842 // for (scan = klass->itable(); scan->interface() != NULL; scan += scan_step) { 4843 // if (scan->interface() == intf) { 4844 // result = (klass + scan->offset() + itable_index); 4845 // } 4846 // } 4847 Label search, found_method; 4848 4849 for (int peel = 1; peel >= 0; peel--) { 4850 movptr(method_result, Address(scan_temp, itableOffsetEntry::interface_offset_in_bytes())); 4851 cmpptr(intf_klass, method_result); 4852 4853 if (peel) { 4854 jccb(Assembler::equal, found_method); 4855 } else { 4856 jccb(Assembler::notEqual, search); 4857 // (invert the test to fall through to found_method...) 4858 } 4859 4860 if (!peel) break; 4861 4862 bind(search); 4863 4864 // Check that the previous entry is non-null. A null entry means that 4865 // the receiver class doesn't implement the interface, and wasn't the 4866 // same as when the caller was compiled. 4867 testptr(method_result, method_result); 4868 jcc(Assembler::zero, L_no_such_interface); 4869 addptr(scan_temp, scan_step); 4870 } 4871 4872 bind(found_method); 4873 4874 // Got a hit. 4875 movl(scan_temp, Address(scan_temp, itableOffsetEntry::offset_offset_in_bytes())); 4876 movptr(method_result, Address(recv_klass, scan_temp, Address::times_1)); 4877 } 4878 4879 4880 // virtual method calling 4881 void MacroAssembler::lookup_virtual_method(Register recv_klass, 4882 RegisterOrConstant vtable_index, 4883 Register method_result) { 4884 const int base = InstanceKlass::vtable_start_offset() * wordSize; 4885 assert(vtableEntry::size() * wordSize == wordSize, "else adjust the scaling in the code below"); 4886 Address vtable_entry_addr(recv_klass, 4887 vtable_index, Address::times_ptr, 4888 base + vtableEntry::method_offset_in_bytes()); 4889 movptr(method_result, vtable_entry_addr); 4890 } 4891 4892 4893 void MacroAssembler::check_klass_subtype(Register sub_klass, 4894 Register super_klass, 4895 Register temp_reg, 4896 Label& L_success) { 4897 Label L_failure; 4898 check_klass_subtype_fast_path(sub_klass, super_klass, temp_reg, &L_success, &L_failure, NULL); 4899 check_klass_subtype_slow_path(sub_klass, super_klass, temp_reg, noreg, &L_success, NULL); 4900 bind(L_failure); 4901 } 4902 4903 4904 void MacroAssembler::check_klass_subtype_fast_path(Register sub_klass, 4905 Register super_klass, 4906 Register temp_reg, 4907 Label* L_success, 4908 Label* L_failure, 4909 Label* L_slow_path, 4910 RegisterOrConstant super_check_offset) { 4911 assert_different_registers(sub_klass, super_klass, temp_reg); 4912 bool must_load_sco = (super_check_offset.constant_or_zero() == -1); 4913 if (super_check_offset.is_register()) { 4914 assert_different_registers(sub_klass, super_klass, 4915 super_check_offset.as_register()); 4916 } else if (must_load_sco) { 4917 assert(temp_reg != noreg, "supply either a temp or a register offset"); 4918 } 4919 4920 Label L_fallthrough; 4921 int label_nulls = 0; 4922 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; } 4923 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; } 4924 if (L_slow_path == NULL) { L_slow_path = &L_fallthrough; label_nulls++; } 4925 assert(label_nulls <= 1, "at most one NULL in the batch"); 4926 4927 int sc_offset = in_bytes(Klass::secondary_super_cache_offset()); 4928 int sco_offset = in_bytes(Klass::super_check_offset_offset()); 4929 Address super_check_offset_addr(super_klass, sco_offset); 4930 4931 // Hacked jcc, which "knows" that L_fallthrough, at least, is in 4932 // range of a jccb. If this routine grows larger, reconsider at 4933 // least some of these. 4934 #define local_jcc(assembler_cond, label) \ 4935 if (&(label) == &L_fallthrough) jccb(assembler_cond, label); \ 4936 else jcc( assembler_cond, label) /*omit semi*/ 4937 4938 // Hacked jmp, which may only be used just before L_fallthrough. 4939 #define final_jmp(label) \ 4940 if (&(label) == &L_fallthrough) { /*do nothing*/ } \ 4941 else jmp(label) /*omit semi*/ 4942 4943 // If the pointers are equal, we are done (e.g., String[] elements). 4944 // This self-check enables sharing of secondary supertype arrays among 4945 // non-primary types such as array-of-interface. Otherwise, each such 4946 // type would need its own customized SSA. 4947 // We move this check to the front of the fast path because many 4948 // type checks are in fact trivially successful in this manner, 4949 // so we get a nicely predicted branch right at the start of the check. 4950 cmpptr(sub_klass, super_klass); 4951 local_jcc(Assembler::equal, *L_success); 4952 4953 // Check the supertype display: 4954 if (must_load_sco) { 4955 // Positive movl does right thing on LP64. 4956 movl(temp_reg, super_check_offset_addr); 4957 super_check_offset = RegisterOrConstant(temp_reg); 4958 } 4959 Address super_check_addr(sub_klass, super_check_offset, Address::times_1, 0); 4960 cmpptr(super_klass, super_check_addr); // load displayed supertype 4961 4962 // This check has worked decisively for primary supers. 4963 // Secondary supers are sought in the super_cache ('super_cache_addr'). 4964 // (Secondary supers are interfaces and very deeply nested subtypes.) 4965 // This works in the same check above because of a tricky aliasing 4966 // between the super_cache and the primary super display elements. 4967 // (The 'super_check_addr' can address either, as the case requires.) 4968 // Note that the cache is updated below if it does not help us find 4969 // what we need immediately. 4970 // So if it was a primary super, we can just fail immediately. 4971 // Otherwise, it's the slow path for us (no success at this point). 4972 4973 if (super_check_offset.is_register()) { 4974 local_jcc(Assembler::equal, *L_success); 4975 cmpl(super_check_offset.as_register(), sc_offset); 4976 if (L_failure == &L_fallthrough) { 4977 local_jcc(Assembler::equal, *L_slow_path); 4978 } else { 4979 local_jcc(Assembler::notEqual, *L_failure); 4980 final_jmp(*L_slow_path); 4981 } 4982 } else if (super_check_offset.as_constant() == sc_offset) { 4983 // Need a slow path; fast failure is impossible. 4984 if (L_slow_path == &L_fallthrough) { 4985 local_jcc(Assembler::equal, *L_success); 4986 } else { 4987 local_jcc(Assembler::notEqual, *L_slow_path); 4988 final_jmp(*L_success); 4989 } 4990 } else { 4991 // No slow path; it's a fast decision. 4992 if (L_failure == &L_fallthrough) { 4993 local_jcc(Assembler::equal, *L_success); 4994 } else { 4995 local_jcc(Assembler::notEqual, *L_failure); 4996 final_jmp(*L_success); 4997 } 4998 } 4999 5000 bind(L_fallthrough); 5001 5002 #undef local_jcc 5003 #undef final_jmp 5004 } 5005 5006 5007 void MacroAssembler::check_klass_subtype_slow_path(Register sub_klass, 5008 Register super_klass, 5009 Register temp_reg, 5010 Register temp2_reg, 5011 Label* L_success, 5012 Label* L_failure, 5013 bool set_cond_codes) { 5014 assert_different_registers(sub_klass, super_klass, temp_reg); 5015 if (temp2_reg != noreg) 5016 assert_different_registers(sub_klass, super_klass, temp_reg, temp2_reg); 5017 #define IS_A_TEMP(reg) ((reg) == temp_reg || (reg) == temp2_reg) 5018 5019 Label L_fallthrough; 5020 int label_nulls = 0; 5021 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; } 5022 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; } 5023 assert(label_nulls <= 1, "at most one NULL in the batch"); 5024 5025 // a couple of useful fields in sub_klass: 5026 int ss_offset = in_bytes(Klass::secondary_supers_offset()); 5027 int sc_offset = in_bytes(Klass::secondary_super_cache_offset()); 5028 Address secondary_supers_addr(sub_klass, ss_offset); 5029 Address super_cache_addr( sub_klass, sc_offset); 5030 5031 // Do a linear scan of the secondary super-klass chain. 5032 // This code is rarely used, so simplicity is a virtue here. 5033 // The repne_scan instruction uses fixed registers, which we must spill. 5034 // Don't worry too much about pre-existing connections with the input regs. 5035 5036 assert(sub_klass != rax, "killed reg"); // killed by mov(rax, super) 5037 assert(sub_klass != rcx, "killed reg"); // killed by lea(rcx, &pst_counter) 5038 5039 // Get super_klass value into rax (even if it was in rdi or rcx). 5040 bool pushed_rax = false, pushed_rcx = false, pushed_rdi = false; 5041 if (super_klass != rax || UseCompressedOops) { 5042 if (!IS_A_TEMP(rax)) { push(rax); pushed_rax = true; } 5043 mov(rax, super_klass); 5044 } 5045 if (!IS_A_TEMP(rcx)) { push(rcx); pushed_rcx = true; } 5046 if (!IS_A_TEMP(rdi)) { push(rdi); pushed_rdi = true; } 5047 5048 #ifndef PRODUCT 5049 int* pst_counter = &SharedRuntime::_partial_subtype_ctr; 5050 ExternalAddress pst_counter_addr((address) pst_counter); 5051 NOT_LP64( incrementl(pst_counter_addr) ); 5052 LP64_ONLY( lea(rcx, pst_counter_addr) ); 5053 LP64_ONLY( incrementl(Address(rcx, 0)) ); 5054 #endif //PRODUCT 5055 5056 // We will consult the secondary-super array. 5057 movptr(rdi, secondary_supers_addr); 5058 // Load the array length. (Positive movl does right thing on LP64.) 5059 movl(rcx, Address(rdi, Array<Klass*>::length_offset_in_bytes())); 5060 // Skip to start of data. 5061 addptr(rdi, Array<Klass*>::base_offset_in_bytes()); 5062 5063 // Scan RCX words at [RDI] for an occurrence of RAX. 5064 // Set NZ/Z based on last compare. 5065 // Z flag value will not be set by 'repne' if RCX == 0 since 'repne' does 5066 // not change flags (only scas instruction which is repeated sets flags). 5067 // Set Z = 0 (not equal) before 'repne' to indicate that class was not found. 5068 5069 testptr(rax,rax); // Set Z = 0 5070 repne_scan(); 5071 5072 // Unspill the temp. registers: 5073 if (pushed_rdi) pop(rdi); 5074 if (pushed_rcx) pop(rcx); 5075 if (pushed_rax) pop(rax); 5076 5077 if (set_cond_codes) { 5078 // Special hack for the AD files: rdi is guaranteed non-zero. 5079 assert(!pushed_rdi, "rdi must be left non-NULL"); 5080 // Also, the condition codes are properly set Z/NZ on succeed/failure. 5081 } 5082 5083 if (L_failure == &L_fallthrough) 5084 jccb(Assembler::notEqual, *L_failure); 5085 else jcc(Assembler::notEqual, *L_failure); 5086 5087 // Success. Cache the super we found and proceed in triumph. 5088 movptr(super_cache_addr, super_klass); 5089 5090 if (L_success != &L_fallthrough) { 5091 jmp(*L_success); 5092 } 5093 5094 #undef IS_A_TEMP 5095 5096 bind(L_fallthrough); 5097 } 5098 5099 5100 void MacroAssembler::cmov32(Condition cc, Register dst, Address src) { 5101 if (VM_Version::supports_cmov()) { 5102 cmovl(cc, dst, src); 5103 } else { 5104 Label L; 5105 jccb(negate_condition(cc), L); 5106 movl(dst, src); 5107 bind(L); 5108 } 5109 } 5110 5111 void MacroAssembler::cmov32(Condition cc, Register dst, Register src) { 5112 if (VM_Version::supports_cmov()) { 5113 cmovl(cc, dst, src); 5114 } else { 5115 Label L; 5116 jccb(negate_condition(cc), L); 5117 movl(dst, src); 5118 bind(L); 5119 } 5120 } 5121 5122 void MacroAssembler::verify_oop(Register reg, const char* s) { 5123 if (!VerifyOops) return; 5124 5125 // Pass register number to verify_oop_subroutine 5126 const char* b = NULL; 5127 { 5128 ResourceMark rm; 5129 stringStream ss; 5130 ss.print("verify_oop: %s: %s", reg->name(), s); 5131 b = code_string(ss.as_string()); 5132 } 5133 BLOCK_COMMENT("verify_oop {"); 5134 #ifdef _LP64 5135 push(rscratch1); // save r10, trashed by movptr() 5136 #endif 5137 push(rax); // save rax, 5138 push(reg); // pass register argument 5139 ExternalAddress buffer((address) b); 5140 // avoid using pushptr, as it modifies scratch registers 5141 // and our contract is not to modify anything 5142 movptr(rax, buffer.addr()); 5143 push(rax); 5144 // call indirectly to solve generation ordering problem 5145 movptr(rax, ExternalAddress(StubRoutines::verify_oop_subroutine_entry_address())); 5146 call(rax); 5147 // Caller pops the arguments (oop, message) and restores rax, r10 5148 BLOCK_COMMENT("} verify_oop"); 5149 } 5150 5151 5152 RegisterOrConstant MacroAssembler::delayed_value_impl(intptr_t* delayed_value_addr, 5153 Register tmp, 5154 int offset) { 5155 intptr_t value = *delayed_value_addr; 5156 if (value != 0) 5157 return RegisterOrConstant(value + offset); 5158 5159 // load indirectly to solve generation ordering problem 5160 movptr(tmp, ExternalAddress((address) delayed_value_addr)); 5161 5162 #ifdef ASSERT 5163 { Label L; 5164 testptr(tmp, tmp); 5165 if (WizardMode) { 5166 const char* buf = NULL; 5167 { 5168 ResourceMark rm; 5169 stringStream ss; 5170 ss.print("DelayedValue=" INTPTR_FORMAT, delayed_value_addr[1]); 5171 buf = code_string(ss.as_string()); 5172 } 5173 jcc(Assembler::notZero, L); 5174 STOP(buf); 5175 } else { 5176 jccb(Assembler::notZero, L); 5177 hlt(); 5178 } 5179 bind(L); 5180 } 5181 #endif 5182 5183 if (offset != 0) 5184 addptr(tmp, offset); 5185 5186 return RegisterOrConstant(tmp); 5187 } 5188 5189 5190 Address MacroAssembler::argument_address(RegisterOrConstant arg_slot, 5191 int extra_slot_offset) { 5192 // cf. TemplateTable::prepare_invoke(), if (load_receiver). 5193 int stackElementSize = Interpreter::stackElementSize; 5194 int offset = Interpreter::expr_offset_in_bytes(extra_slot_offset+0); 5195 #ifdef ASSERT 5196 int offset1 = Interpreter::expr_offset_in_bytes(extra_slot_offset+1); 5197 assert(offset1 - offset == stackElementSize, "correct arithmetic"); 5198 #endif 5199 Register scale_reg = noreg; 5200 Address::ScaleFactor scale_factor = Address::no_scale; 5201 if (arg_slot.is_constant()) { 5202 offset += arg_slot.as_constant() * stackElementSize; 5203 } else { 5204 scale_reg = arg_slot.as_register(); 5205 scale_factor = Address::times(stackElementSize); 5206 } 5207 offset += wordSize; // return PC is on stack 5208 return Address(rsp, scale_reg, scale_factor, offset); 5209 } 5210 5211 5212 void MacroAssembler::verify_oop_addr(Address addr, const char* s) { 5213 if (!VerifyOops) return; 5214 5215 // Address adjust(addr.base(), addr.index(), addr.scale(), addr.disp() + BytesPerWord); 5216 // Pass register number to verify_oop_subroutine 5217 const char* b = NULL; 5218 { 5219 ResourceMark rm; 5220 stringStream ss; 5221 ss.print("verify_oop_addr: %s", s); 5222 b = code_string(ss.as_string()); 5223 } 5224 #ifdef _LP64 5225 push(rscratch1); // save r10, trashed by movptr() 5226 #endif 5227 push(rax); // save rax, 5228 // addr may contain rsp so we will have to adjust it based on the push 5229 // we just did (and on 64 bit we do two pushes) 5230 // NOTE: 64bit seemed to have had a bug in that it did movq(addr, rax); which 5231 // stores rax into addr which is backwards of what was intended. 5232 if (addr.uses(rsp)) { 5233 lea(rax, addr); 5234 pushptr(Address(rax, LP64_ONLY(2 *) BytesPerWord)); 5235 } else { 5236 pushptr(addr); 5237 } 5238 5239 ExternalAddress buffer((address) b); 5240 // pass msg argument 5241 // avoid using pushptr, as it modifies scratch registers 5242 // and our contract is not to modify anything 5243 movptr(rax, buffer.addr()); 5244 push(rax); 5245 5246 // call indirectly to solve generation ordering problem 5247 movptr(rax, ExternalAddress(StubRoutines::verify_oop_subroutine_entry_address())); 5248 call(rax); 5249 // Caller pops the arguments (addr, message) and restores rax, r10. 5250 } 5251 5252 void MacroAssembler::verify_tlab() { 5253 #ifdef ASSERT 5254 if (UseTLAB && VerifyOops) { 5255 Label next, ok; 5256 Register t1 = rsi; 5257 Register thread_reg = NOT_LP64(rbx) LP64_ONLY(r15_thread); 5258 5259 push(t1); 5260 NOT_LP64(push(thread_reg)); 5261 NOT_LP64(get_thread(thread_reg)); 5262 5263 movptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_top_offset()))); 5264 cmpptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_start_offset()))); 5265 jcc(Assembler::aboveEqual, next); 5266 STOP("assert(top >= start)"); 5267 should_not_reach_here(); 5268 5269 bind(next); 5270 movptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_end_offset()))); 5271 cmpptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_top_offset()))); 5272 jcc(Assembler::aboveEqual, ok); 5273 STOP("assert(top <= end)"); 5274 should_not_reach_here(); 5275 5276 bind(ok); 5277 NOT_LP64(pop(thread_reg)); 5278 pop(t1); 5279 } 5280 #endif 5281 } 5282 5283 class ControlWord { 5284 public: 5285 int32_t _value; 5286 5287 int rounding_control() const { return (_value >> 10) & 3 ; } 5288 int precision_control() const { return (_value >> 8) & 3 ; } 5289 bool precision() const { return ((_value >> 5) & 1) != 0; } 5290 bool underflow() const { return ((_value >> 4) & 1) != 0; } 5291 bool overflow() const { return ((_value >> 3) & 1) != 0; } 5292 bool zero_divide() const { return ((_value >> 2) & 1) != 0; } 5293 bool denormalized() const { return ((_value >> 1) & 1) != 0; } 5294 bool invalid() const { return ((_value >> 0) & 1) != 0; } 5295 5296 void print() const { 5297 // rounding control 5298 const char* rc; 5299 switch (rounding_control()) { 5300 case 0: rc = "round near"; break; 5301 case 1: rc = "round down"; break; 5302 case 2: rc = "round up "; break; 5303 case 3: rc = "chop "; break; 5304 }; 5305 // precision control 5306 const char* pc; 5307 switch (precision_control()) { 5308 case 0: pc = "24 bits "; break; 5309 case 1: pc = "reserved"; break; 5310 case 2: pc = "53 bits "; break; 5311 case 3: pc = "64 bits "; break; 5312 }; 5313 // flags 5314 char f[9]; 5315 f[0] = ' '; 5316 f[1] = ' '; 5317 f[2] = (precision ()) ? 'P' : 'p'; 5318 f[3] = (underflow ()) ? 'U' : 'u'; 5319 f[4] = (overflow ()) ? 'O' : 'o'; 5320 f[5] = (zero_divide ()) ? 'Z' : 'z'; 5321 f[6] = (denormalized()) ? 'D' : 'd'; 5322 f[7] = (invalid ()) ? 'I' : 'i'; 5323 f[8] = '\x0'; 5324 // output 5325 printf("%04x masks = %s, %s, %s", _value & 0xFFFF, f, rc, pc); 5326 } 5327 5328 }; 5329 5330 class StatusWord { 5331 public: 5332 int32_t _value; 5333 5334 bool busy() const { return ((_value >> 15) & 1) != 0; } 5335 bool C3() const { return ((_value >> 14) & 1) != 0; } 5336 bool C2() const { return ((_value >> 10) & 1) != 0; } 5337 bool C1() const { return ((_value >> 9) & 1) != 0; } 5338 bool C0() const { return ((_value >> 8) & 1) != 0; } 5339 int top() const { return (_value >> 11) & 7 ; } 5340 bool error_status() const { return ((_value >> 7) & 1) != 0; } 5341 bool stack_fault() const { return ((_value >> 6) & 1) != 0; } 5342 bool precision() const { return ((_value >> 5) & 1) != 0; } 5343 bool underflow() const { return ((_value >> 4) & 1) != 0; } 5344 bool overflow() const { return ((_value >> 3) & 1) != 0; } 5345 bool zero_divide() const { return ((_value >> 2) & 1) != 0; } 5346 bool denormalized() const { return ((_value >> 1) & 1) != 0; } 5347 bool invalid() const { return ((_value >> 0) & 1) != 0; } 5348 5349 void print() const { 5350 // condition codes 5351 char c[5]; 5352 c[0] = (C3()) ? '3' : '-'; 5353 c[1] = (C2()) ? '2' : '-'; 5354 c[2] = (C1()) ? '1' : '-'; 5355 c[3] = (C0()) ? '0' : '-'; 5356 c[4] = '\x0'; 5357 // flags 5358 char f[9]; 5359 f[0] = (error_status()) ? 'E' : '-'; 5360 f[1] = (stack_fault ()) ? 'S' : '-'; 5361 f[2] = (precision ()) ? 'P' : '-'; 5362 f[3] = (underflow ()) ? 'U' : '-'; 5363 f[4] = (overflow ()) ? 'O' : '-'; 5364 f[5] = (zero_divide ()) ? 'Z' : '-'; 5365 f[6] = (denormalized()) ? 'D' : '-'; 5366 f[7] = (invalid ()) ? 'I' : '-'; 5367 f[8] = '\x0'; 5368 // output 5369 printf("%04x flags = %s, cc = %s, top = %d", _value & 0xFFFF, f, c, top()); 5370 } 5371 5372 }; 5373 5374 class TagWord { 5375 public: 5376 int32_t _value; 5377 5378 int tag_at(int i) const { return (_value >> (i*2)) & 3; } 5379 5380 void print() const { 5381 printf("%04x", _value & 0xFFFF); 5382 } 5383 5384 }; 5385 5386 class FPU_Register { 5387 public: 5388 int32_t _m0; 5389 int32_t _m1; 5390 int16_t _ex; 5391 5392 bool is_indefinite() const { 5393 return _ex == -1 && _m1 == (int32_t)0xC0000000 && _m0 == 0; 5394 } 5395 5396 void print() const { 5397 char sign = (_ex < 0) ? '-' : '+'; 5398 const char* kind = (_ex == 0x7FFF || _ex == (int16_t)-1) ? "NaN" : " "; 5399 printf("%c%04hx.%08x%08x %s", sign, _ex, _m1, _m0, kind); 5400 }; 5401 5402 }; 5403 5404 class FPU_State { 5405 public: 5406 enum { 5407 register_size = 10, 5408 number_of_registers = 8, 5409 register_mask = 7 5410 }; 5411 5412 ControlWord _control_word; 5413 StatusWord _status_word; 5414 TagWord _tag_word; 5415 int32_t _error_offset; 5416 int32_t _error_selector; 5417 int32_t _data_offset; 5418 int32_t _data_selector; 5419 int8_t _register[register_size * number_of_registers]; 5420 5421 int tag_for_st(int i) const { return _tag_word.tag_at((_status_word.top() + i) & register_mask); } 5422 FPU_Register* st(int i) const { return (FPU_Register*)&_register[register_size * i]; } 5423 5424 const char* tag_as_string(int tag) const { 5425 switch (tag) { 5426 case 0: return "valid"; 5427 case 1: return "zero"; 5428 case 2: return "special"; 5429 case 3: return "empty"; 5430 } 5431 ShouldNotReachHere(); 5432 return NULL; 5433 } 5434 5435 void print() const { 5436 // print computation registers 5437 { int t = _status_word.top(); 5438 for (int i = 0; i < number_of_registers; i++) { 5439 int j = (i - t) & register_mask; 5440 printf("%c r%d = ST%d = ", (j == 0 ? '*' : ' '), i, j); 5441 st(j)->print(); 5442 printf(" %s\n", tag_as_string(_tag_word.tag_at(i))); 5443 } 5444 } 5445 printf("\n"); 5446 // print control registers 5447 printf("ctrl = "); _control_word.print(); printf("\n"); 5448 printf("stat = "); _status_word .print(); printf("\n"); 5449 printf("tags = "); _tag_word .print(); printf("\n"); 5450 } 5451 5452 }; 5453 5454 class Flag_Register { 5455 public: 5456 int32_t _value; 5457 5458 bool overflow() const { return ((_value >> 11) & 1) != 0; } 5459 bool direction() const { return ((_value >> 10) & 1) != 0; } 5460 bool sign() const { return ((_value >> 7) & 1) != 0; } 5461 bool zero() const { return ((_value >> 6) & 1) != 0; } 5462 bool auxiliary_carry() const { return ((_value >> 4) & 1) != 0; } 5463 bool parity() const { return ((_value >> 2) & 1) != 0; } 5464 bool carry() const { return ((_value >> 0) & 1) != 0; } 5465 5466 void print() const { 5467 // flags 5468 char f[8]; 5469 f[0] = (overflow ()) ? 'O' : '-'; 5470 f[1] = (direction ()) ? 'D' : '-'; 5471 f[2] = (sign ()) ? 'S' : '-'; 5472 f[3] = (zero ()) ? 'Z' : '-'; 5473 f[4] = (auxiliary_carry()) ? 'A' : '-'; 5474 f[5] = (parity ()) ? 'P' : '-'; 5475 f[6] = (carry ()) ? 'C' : '-'; 5476 f[7] = '\x0'; 5477 // output 5478 printf("%08x flags = %s", _value, f); 5479 } 5480 5481 }; 5482 5483 class IU_Register { 5484 public: 5485 int32_t _value; 5486 5487 void print() const { 5488 printf("%08x %11d", _value, _value); 5489 } 5490 5491 }; 5492 5493 class IU_State { 5494 public: 5495 Flag_Register _eflags; 5496 IU_Register _rdi; 5497 IU_Register _rsi; 5498 IU_Register _rbp; 5499 IU_Register _rsp; 5500 IU_Register _rbx; 5501 IU_Register _rdx; 5502 IU_Register _rcx; 5503 IU_Register _rax; 5504 5505 void print() const { 5506 // computation registers 5507 printf("rax, = "); _rax.print(); printf("\n"); 5508 printf("rbx, = "); _rbx.print(); printf("\n"); 5509 printf("rcx = "); _rcx.print(); printf("\n"); 5510 printf("rdx = "); _rdx.print(); printf("\n"); 5511 printf("rdi = "); _rdi.print(); printf("\n"); 5512 printf("rsi = "); _rsi.print(); printf("\n"); 5513 printf("rbp, = "); _rbp.print(); printf("\n"); 5514 printf("rsp = "); _rsp.print(); printf("\n"); 5515 printf("\n"); 5516 // control registers 5517 printf("flgs = "); _eflags.print(); printf("\n"); 5518 } 5519 }; 5520 5521 5522 class CPU_State { 5523 public: 5524 FPU_State _fpu_state; 5525 IU_State _iu_state; 5526 5527 void print() const { 5528 printf("--------------------------------------------------\n"); 5529 _iu_state .print(); 5530 printf("\n"); 5531 _fpu_state.print(); 5532 printf("--------------------------------------------------\n"); 5533 } 5534 5535 }; 5536 5537 5538 static void _print_CPU_state(CPU_State* state) { 5539 state->print(); 5540 }; 5541 5542 5543 void MacroAssembler::print_CPU_state() { 5544 push_CPU_state(); 5545 push(rsp); // pass CPU state 5546 call(RuntimeAddress(CAST_FROM_FN_PTR(address, _print_CPU_state))); 5547 addptr(rsp, wordSize); // discard argument 5548 pop_CPU_state(); 5549 } 5550 5551 5552 static bool _verify_FPU(int stack_depth, char* s, CPU_State* state) { 5553 static int counter = 0; 5554 FPU_State* fs = &state->_fpu_state; 5555 counter++; 5556 // For leaf calls, only verify that the top few elements remain empty. 5557 // We only need 1 empty at the top for C2 code. 5558 if( stack_depth < 0 ) { 5559 if( fs->tag_for_st(7) != 3 ) { 5560 printf("FPR7 not empty\n"); 5561 state->print(); 5562 assert(false, "error"); 5563 return false; 5564 } 5565 return true; // All other stack states do not matter 5566 } 5567 5568 assert((fs->_control_word._value & 0xffff) == StubRoutines::_fpu_cntrl_wrd_std, 5569 "bad FPU control word"); 5570 5571 // compute stack depth 5572 int i = 0; 5573 while (i < FPU_State::number_of_registers && fs->tag_for_st(i) < 3) i++; 5574 int d = i; 5575 while (i < FPU_State::number_of_registers && fs->tag_for_st(i) == 3) i++; 5576 // verify findings 5577 if (i != FPU_State::number_of_registers) { 5578 // stack not contiguous 5579 printf("%s: stack not contiguous at ST%d\n", s, i); 5580 state->print(); 5581 assert(false, "error"); 5582 return false; 5583 } 5584 // check if computed stack depth corresponds to expected stack depth 5585 if (stack_depth < 0) { 5586 // expected stack depth is -stack_depth or less 5587 if (d > -stack_depth) { 5588 // too many elements on the stack 5589 printf("%s: <= %d stack elements expected but found %d\n", s, -stack_depth, d); 5590 state->print(); 5591 assert(false, "error"); 5592 return false; 5593 } 5594 } else { 5595 // expected stack depth is stack_depth 5596 if (d != stack_depth) { 5597 // wrong stack depth 5598 printf("%s: %d stack elements expected but found %d\n", s, stack_depth, d); 5599 state->print(); 5600 assert(false, "error"); 5601 return false; 5602 } 5603 } 5604 // everything is cool 5605 return true; 5606 } 5607 5608 5609 void MacroAssembler::verify_FPU(int stack_depth, const char* s) { 5610 if (!VerifyFPU) return; 5611 push_CPU_state(); 5612 push(rsp); // pass CPU state 5613 ExternalAddress msg((address) s); 5614 // pass message string s 5615 pushptr(msg.addr()); 5616 push(stack_depth); // pass stack depth 5617 call(RuntimeAddress(CAST_FROM_FN_PTR(address, _verify_FPU))); 5618 addptr(rsp, 3 * wordSize); // discard arguments 5619 // check for error 5620 { Label L; 5621 testl(rax, rax); 5622 jcc(Assembler::notZero, L); 5623 int3(); // break if error condition 5624 bind(L); 5625 } 5626 pop_CPU_state(); 5627 } 5628 5629 void MacroAssembler::restore_cpu_control_state_after_jni() { 5630 // Either restore the MXCSR register after returning from the JNI Call 5631 // or verify that it wasn't changed (with -Xcheck:jni flag). 5632 if (VM_Version::supports_sse()) { 5633 if (RestoreMXCSROnJNICalls) { 5634 ldmxcsr(ExternalAddress(StubRoutines::addr_mxcsr_std())); 5635 } else if (CheckJNICalls) { 5636 call(RuntimeAddress(StubRoutines::x86::verify_mxcsr_entry())); 5637 } 5638 } 5639 if (VM_Version::supports_avx()) { 5640 // Clear upper bits of YMM registers to avoid SSE <-> AVX transition penalty. 5641 vzeroupper(); 5642 } 5643 5644 #ifndef _LP64 5645 // Either restore the x87 floating pointer control word after returning 5646 // from the JNI call or verify that it wasn't changed. 5647 if (CheckJNICalls) { 5648 call(RuntimeAddress(StubRoutines::x86::verify_fpu_cntrl_wrd_entry())); 5649 } 5650 #endif // _LP64 5651 } 5652 5653 5654 void MacroAssembler::load_klass(Register dst, Register src) { 5655 #ifdef _LP64 5656 if (UseCompressedClassPointers) { 5657 movl(dst, Address(src, oopDesc::klass_offset_in_bytes())); 5658 decode_klass_not_null(dst); 5659 } else 5660 #endif 5661 movptr(dst, Address(src, oopDesc::klass_offset_in_bytes())); 5662 } 5663 5664 void MacroAssembler::load_prototype_header(Register dst, Register src) { 5665 load_klass(dst, src); 5666 movptr(dst, Address(dst, Klass::prototype_header_offset())); 5667 } 5668 5669 void MacroAssembler::store_klass(Register dst, Register src) { 5670 #ifdef _LP64 5671 if (UseCompressedClassPointers) { 5672 encode_klass_not_null(src); 5673 movl(Address(dst, oopDesc::klass_offset_in_bytes()), src); 5674 } else 5675 #endif 5676 movptr(Address(dst, oopDesc::klass_offset_in_bytes()), src); 5677 } 5678 5679 void MacroAssembler::load_heap_oop(Register dst, Address src) { 5680 #ifdef _LP64 5681 // FIXME: Must change all places where we try to load the klass. 5682 if (UseCompressedOops) { 5683 movl(dst, src); 5684 decode_heap_oop(dst); 5685 } else 5686 #endif 5687 movptr(dst, src); 5688 } 5689 5690 // Doesn't do verfication, generates fixed size code 5691 void MacroAssembler::load_heap_oop_not_null(Register dst, Address src) { 5692 #ifdef _LP64 5693 if (UseCompressedOops) { 5694 movl(dst, src); 5695 decode_heap_oop_not_null(dst); 5696 } else 5697 #endif 5698 movptr(dst, src); 5699 } 5700 5701 void MacroAssembler::store_heap_oop(Address dst, Register src) { 5702 #ifdef _LP64 5703 if (UseCompressedOops) { 5704 assert(!dst.uses(src), "not enough registers"); 5705 encode_heap_oop(src); 5706 movl(dst, src); 5707 } else 5708 #endif 5709 movptr(dst, src); 5710 } 5711 5712 void MacroAssembler::cmp_heap_oop(Register src1, Address src2, Register tmp) { 5713 assert_different_registers(src1, tmp); 5714 #ifdef _LP64 5715 if (UseCompressedOops) { 5716 bool did_push = false; 5717 if (tmp == noreg) { 5718 tmp = rax; 5719 push(tmp); 5720 did_push = true; 5721 assert(!src2.uses(rsp), "can't push"); 5722 } 5723 load_heap_oop(tmp, src2); 5724 cmpptr(src1, tmp); 5725 if (did_push) pop(tmp); 5726 } else 5727 #endif 5728 cmpptr(src1, src2); 5729 } 5730 5731 // Used for storing NULLs. 5732 void MacroAssembler::store_heap_oop_null(Address dst) { 5733 #ifdef _LP64 5734 if (UseCompressedOops) { 5735 movl(dst, (int32_t)NULL_WORD); 5736 } else { 5737 movslq(dst, (int32_t)NULL_WORD); 5738 } 5739 #else 5740 movl(dst, (int32_t)NULL_WORD); 5741 #endif 5742 } 5743 5744 #ifdef _LP64 5745 void MacroAssembler::store_klass_gap(Register dst, Register src) { 5746 if (UseCompressedClassPointers) { 5747 // Store to klass gap in destination 5748 movl(Address(dst, oopDesc::klass_gap_offset_in_bytes()), src); 5749 } 5750 } 5751 5752 #ifdef ASSERT 5753 void MacroAssembler::verify_heapbase(const char* msg) { 5754 assert (UseCompressedOops, "should be compressed"); 5755 assert (Universe::heap() != NULL, "java heap should be initialized"); 5756 if (CheckCompressedOops) { 5757 Label ok; 5758 push(rscratch1); // cmpptr trashes rscratch1 5759 cmpptr(r12_heapbase, ExternalAddress((address)Universe::narrow_ptrs_base_addr())); 5760 jcc(Assembler::equal, ok); 5761 STOP(msg); 5762 bind(ok); 5763 pop(rscratch1); 5764 } 5765 } 5766 #endif 5767 5768 // Algorithm must match oop.inline.hpp encode_heap_oop. 5769 void MacroAssembler::encode_heap_oop(Register r) { 5770 #ifdef ASSERT 5771 verify_heapbase("MacroAssembler::encode_heap_oop: heap base corrupted?"); 5772 #endif 5773 verify_oop(r, "broken oop in encode_heap_oop"); 5774 if (Universe::narrow_oop_base() == NULL) { 5775 if (Universe::narrow_oop_shift() != 0) { 5776 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 5777 shrq(r, LogMinObjAlignmentInBytes); 5778 } 5779 return; 5780 } 5781 testq(r, r); 5782 cmovq(Assembler::equal, r, r12_heapbase); 5783 subq(r, r12_heapbase); 5784 shrq(r, LogMinObjAlignmentInBytes); 5785 } 5786 5787 void MacroAssembler::encode_heap_oop_not_null(Register r) { 5788 #ifdef ASSERT 5789 verify_heapbase("MacroAssembler::encode_heap_oop_not_null: heap base corrupted?"); 5790 if (CheckCompressedOops) { 5791 Label ok; 5792 testq(r, r); 5793 jcc(Assembler::notEqual, ok); 5794 STOP("null oop passed to encode_heap_oop_not_null"); 5795 bind(ok); 5796 } 5797 #endif 5798 verify_oop(r, "broken oop in encode_heap_oop_not_null"); 5799 if (Universe::narrow_oop_base() != NULL) { 5800 subq(r, r12_heapbase); 5801 } 5802 if (Universe::narrow_oop_shift() != 0) { 5803 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 5804 shrq(r, LogMinObjAlignmentInBytes); 5805 } 5806 } 5807 5808 void MacroAssembler::encode_heap_oop_not_null(Register dst, Register src) { 5809 #ifdef ASSERT 5810 verify_heapbase("MacroAssembler::encode_heap_oop_not_null2: heap base corrupted?"); 5811 if (CheckCompressedOops) { 5812 Label ok; 5813 testq(src, src); 5814 jcc(Assembler::notEqual, ok); 5815 STOP("null oop passed to encode_heap_oop_not_null2"); 5816 bind(ok); 5817 } 5818 #endif 5819 verify_oop(src, "broken oop in encode_heap_oop_not_null2"); 5820 if (dst != src) { 5821 movq(dst, src); 5822 } 5823 if (Universe::narrow_oop_base() != NULL) { 5824 subq(dst, r12_heapbase); 5825 } 5826 if (Universe::narrow_oop_shift() != 0) { 5827 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 5828 shrq(dst, LogMinObjAlignmentInBytes); 5829 } 5830 } 5831 5832 void MacroAssembler::decode_heap_oop(Register r) { 5833 #ifdef ASSERT 5834 verify_heapbase("MacroAssembler::decode_heap_oop: heap base corrupted?"); 5835 #endif 5836 if (Universe::narrow_oop_base() == NULL) { 5837 if (Universe::narrow_oop_shift() != 0) { 5838 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 5839 shlq(r, LogMinObjAlignmentInBytes); 5840 } 5841 } else { 5842 Label done; 5843 shlq(r, LogMinObjAlignmentInBytes); 5844 jccb(Assembler::equal, done); 5845 addq(r, r12_heapbase); 5846 bind(done); 5847 } 5848 verify_oop(r, "broken oop in decode_heap_oop"); 5849 } 5850 5851 void MacroAssembler::decode_heap_oop_not_null(Register r) { 5852 // Note: it will change flags 5853 assert (UseCompressedOops, "should only be used for compressed headers"); 5854 assert (Universe::heap() != NULL, "java heap should be initialized"); 5855 // Cannot assert, unverified entry point counts instructions (see .ad file) 5856 // vtableStubs also counts instructions in pd_code_size_limit. 5857 // Also do not verify_oop as this is called by verify_oop. 5858 if (Universe::narrow_oop_shift() != 0) { 5859 assert(LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 5860 shlq(r, LogMinObjAlignmentInBytes); 5861 if (Universe::narrow_oop_base() != NULL) { 5862 addq(r, r12_heapbase); 5863 } 5864 } else { 5865 assert (Universe::narrow_oop_base() == NULL, "sanity"); 5866 } 5867 } 5868 5869 void MacroAssembler::decode_heap_oop_not_null(Register dst, Register src) { 5870 // Note: it will change flags 5871 assert (UseCompressedOops, "should only be used for compressed headers"); 5872 assert (Universe::heap() != NULL, "java heap should be initialized"); 5873 // Cannot assert, unverified entry point counts instructions (see .ad file) 5874 // vtableStubs also counts instructions in pd_code_size_limit. 5875 // Also do not verify_oop as this is called by verify_oop. 5876 if (Universe::narrow_oop_shift() != 0) { 5877 assert(LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 5878 if (LogMinObjAlignmentInBytes == Address::times_8) { 5879 leaq(dst, Address(r12_heapbase, src, Address::times_8, 0)); 5880 } else { 5881 if (dst != src) { 5882 movq(dst, src); 5883 } 5884 shlq(dst, LogMinObjAlignmentInBytes); 5885 if (Universe::narrow_oop_base() != NULL) { 5886 addq(dst, r12_heapbase); 5887 } 5888 } 5889 } else { 5890 assert (Universe::narrow_oop_base() == NULL, "sanity"); 5891 if (dst != src) { 5892 movq(dst, src); 5893 } 5894 } 5895 } 5896 5897 void MacroAssembler::encode_klass_not_null(Register r) { 5898 if (Universe::narrow_klass_base() != NULL) { 5899 // Use r12 as a scratch register in which to temporarily load the narrow_klass_base. 5900 assert(r != r12_heapbase, "Encoding a klass in r12"); 5901 mov64(r12_heapbase, (int64_t)Universe::narrow_klass_base()); 5902 subq(r, r12_heapbase); 5903 } 5904 if (Universe::narrow_klass_shift() != 0) { 5905 assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong"); 5906 shrq(r, LogKlassAlignmentInBytes); 5907 } 5908 if (Universe::narrow_klass_base() != NULL) { 5909 reinit_heapbase(); 5910 } 5911 } 5912 5913 void MacroAssembler::encode_klass_not_null(Register dst, Register src) { 5914 if (dst == src) { 5915 encode_klass_not_null(src); 5916 } else { 5917 if (Universe::narrow_klass_base() != NULL) { 5918 mov64(dst, (int64_t)Universe::narrow_klass_base()); 5919 negq(dst); 5920 addq(dst, src); 5921 } else { 5922 movptr(dst, src); 5923 } 5924 if (Universe::narrow_klass_shift() != 0) { 5925 assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong"); 5926 shrq(dst, LogKlassAlignmentInBytes); 5927 } 5928 } 5929 } 5930 5931 // Function instr_size_for_decode_klass_not_null() counts the instructions 5932 // generated by decode_klass_not_null(register r) and reinit_heapbase(), 5933 // when (Universe::heap() != NULL). Hence, if the instructions they 5934 // generate change, then this method needs to be updated. 5935 int MacroAssembler::instr_size_for_decode_klass_not_null() { 5936 assert (UseCompressedClassPointers, "only for compressed klass ptrs"); 5937 if (Universe::narrow_klass_base() != NULL) { 5938 // mov64 + addq + shlq? + mov64 (for reinit_heapbase()). 5939 return (Universe::narrow_klass_shift() == 0 ? 20 : 24); 5940 } else { 5941 // longest load decode klass function, mov64, leaq 5942 return 16; 5943 } 5944 } 5945 5946 // !!! If the instructions that get generated here change then function 5947 // instr_size_for_decode_klass_not_null() needs to get updated. 5948 void MacroAssembler::decode_klass_not_null(Register r) { 5949 // Note: it will change flags 5950 assert (UseCompressedClassPointers, "should only be used for compressed headers"); 5951 assert(r != r12_heapbase, "Decoding a klass in r12"); 5952 // Cannot assert, unverified entry point counts instructions (see .ad file) 5953 // vtableStubs also counts instructions in pd_code_size_limit. 5954 // Also do not verify_oop as this is called by verify_oop. 5955 if (Universe::narrow_klass_shift() != 0) { 5956 assert(LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong"); 5957 shlq(r, LogKlassAlignmentInBytes); 5958 } 5959 // Use r12 as a scratch register in which to temporarily load the narrow_klass_base. 5960 if (Universe::narrow_klass_base() != NULL) { 5961 mov64(r12_heapbase, (int64_t)Universe::narrow_klass_base()); 5962 addq(r, r12_heapbase); 5963 reinit_heapbase(); 5964 } 5965 } 5966 5967 void MacroAssembler::decode_klass_not_null(Register dst, Register src) { 5968 // Note: it will change flags 5969 assert (UseCompressedClassPointers, "should only be used for compressed headers"); 5970 if (dst == src) { 5971 decode_klass_not_null(dst); 5972 } else { 5973 // Cannot assert, unverified entry point counts instructions (see .ad file) 5974 // vtableStubs also counts instructions in pd_code_size_limit. 5975 // Also do not verify_oop as this is called by verify_oop. 5976 mov64(dst, (int64_t)Universe::narrow_klass_base()); 5977 if (Universe::narrow_klass_shift() != 0) { 5978 assert(LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong"); 5979 assert(LogKlassAlignmentInBytes == Address::times_8, "klass not aligned on 64bits?"); 5980 leaq(dst, Address(dst, src, Address::times_8, 0)); 5981 } else { 5982 addq(dst, src); 5983 } 5984 } 5985 } 5986 5987 void MacroAssembler::set_narrow_oop(Register dst, jobject obj) { 5988 assert (UseCompressedOops, "should only be used for compressed headers"); 5989 assert (Universe::heap() != NULL, "java heap should be initialized"); 5990 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 5991 int oop_index = oop_recorder()->find_index(obj); 5992 RelocationHolder rspec = oop_Relocation::spec(oop_index); 5993 mov_narrow_oop(dst, oop_index, rspec); 5994 } 5995 5996 void MacroAssembler::set_narrow_oop(Address dst, jobject obj) { 5997 assert (UseCompressedOops, "should only be used for compressed headers"); 5998 assert (Universe::heap() != NULL, "java heap should be initialized"); 5999 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 6000 int oop_index = oop_recorder()->find_index(obj); 6001 RelocationHolder rspec = oop_Relocation::spec(oop_index); 6002 mov_narrow_oop(dst, oop_index, rspec); 6003 } 6004 6005 void MacroAssembler::set_narrow_klass(Register dst, Klass* k) { 6006 assert (UseCompressedClassPointers, "should only be used for compressed headers"); 6007 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 6008 int klass_index = oop_recorder()->find_index(k); 6009 RelocationHolder rspec = metadata_Relocation::spec(klass_index); 6010 mov_narrow_oop(dst, Klass::encode_klass(k), rspec); 6011 } 6012 6013 void MacroAssembler::set_narrow_klass(Address dst, Klass* k) { 6014 assert (UseCompressedClassPointers, "should only be used for compressed headers"); 6015 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 6016 int klass_index = oop_recorder()->find_index(k); 6017 RelocationHolder rspec = metadata_Relocation::spec(klass_index); 6018 mov_narrow_oop(dst, Klass::encode_klass(k), rspec); 6019 } 6020 6021 void MacroAssembler::cmp_narrow_oop(Register dst, jobject obj) { 6022 assert (UseCompressedOops, "should only be used for compressed headers"); 6023 assert (Universe::heap() != NULL, "java heap should be initialized"); 6024 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 6025 int oop_index = oop_recorder()->find_index(obj); 6026 RelocationHolder rspec = oop_Relocation::spec(oop_index); 6027 Assembler::cmp_narrow_oop(dst, oop_index, rspec); 6028 } 6029 6030 void MacroAssembler::cmp_narrow_oop(Address dst, jobject obj) { 6031 assert (UseCompressedOops, "should only be used for compressed headers"); 6032 assert (Universe::heap() != NULL, "java heap should be initialized"); 6033 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 6034 int oop_index = oop_recorder()->find_index(obj); 6035 RelocationHolder rspec = oop_Relocation::spec(oop_index); 6036 Assembler::cmp_narrow_oop(dst, oop_index, rspec); 6037 } 6038 6039 void MacroAssembler::cmp_narrow_klass(Register dst, Klass* k) { 6040 assert (UseCompressedClassPointers, "should only be used for compressed headers"); 6041 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 6042 int klass_index = oop_recorder()->find_index(k); 6043 RelocationHolder rspec = metadata_Relocation::spec(klass_index); 6044 Assembler::cmp_narrow_oop(dst, Klass::encode_klass(k), rspec); 6045 } 6046 6047 void MacroAssembler::cmp_narrow_klass(Address dst, Klass* k) { 6048 assert (UseCompressedClassPointers, "should only be used for compressed headers"); 6049 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 6050 int klass_index = oop_recorder()->find_index(k); 6051 RelocationHolder rspec = metadata_Relocation::spec(klass_index); 6052 Assembler::cmp_narrow_oop(dst, Klass::encode_klass(k), rspec); 6053 } 6054 6055 void MacroAssembler::reinit_heapbase() { 6056 if (UseCompressedOops || UseCompressedClassPointers) { 6057 if (Universe::heap() != NULL) { 6058 if (Universe::narrow_oop_base() == NULL) { 6059 MacroAssembler::xorptr(r12_heapbase, r12_heapbase); 6060 } else { 6061 mov64(r12_heapbase, (int64_t)Universe::narrow_ptrs_base()); 6062 } 6063 } else { 6064 movptr(r12_heapbase, ExternalAddress((address)Universe::narrow_ptrs_base_addr())); 6065 } 6066 } 6067 } 6068 6069 #endif // _LP64 6070 6071 6072 // C2 compiled method's prolog code. 6073 void MacroAssembler::verified_entry(int framesize, int stack_bang_size, bool fp_mode_24b) { 6074 6075 // WARNING: Initial instruction MUST be 5 bytes or longer so that 6076 // NativeJump::patch_verified_entry will be able to patch out the entry 6077 // code safely. The push to verify stack depth is ok at 5 bytes, 6078 // the frame allocation can be either 3 or 6 bytes. So if we don't do 6079 // stack bang then we must use the 6 byte frame allocation even if 6080 // we have no frame. :-( 6081 assert(stack_bang_size >= framesize || stack_bang_size <= 0, "stack bang size incorrect"); 6082 6083 assert((framesize & (StackAlignmentInBytes-1)) == 0, "frame size not aligned"); 6084 // Remove word for return addr 6085 framesize -= wordSize; 6086 stack_bang_size -= wordSize; 6087 6088 // Calls to C2R adapters often do not accept exceptional returns. 6089 // We require that their callers must bang for them. But be careful, because 6090 // some VM calls (such as call site linkage) can use several kilobytes of 6091 // stack. But the stack safety zone should account for that. 6092 // See bugs 4446381, 4468289, 4497237. 6093 if (stack_bang_size > 0) { 6094 generate_stack_overflow_check(stack_bang_size); 6095 6096 // We always push rbp, so that on return to interpreter rbp, will be 6097 // restored correctly and we can correct the stack. 6098 push(rbp); 6099 // Save caller's stack pointer into RBP if the frame pointer is preserved. 6100 if (PreserveFramePointer) { 6101 mov(rbp, rsp); 6102 } 6103 // Remove word for ebp 6104 framesize -= wordSize; 6105 6106 // Create frame 6107 if (framesize) { 6108 subptr(rsp, framesize); 6109 } 6110 } else { 6111 // Create frame (force generation of a 4 byte immediate value) 6112 subptr_imm32(rsp, framesize); 6113 6114 // Save RBP register now. 6115 framesize -= wordSize; 6116 movptr(Address(rsp, framesize), rbp); 6117 // Save caller's stack pointer into RBP if the frame pointer is preserved. 6118 if (PreserveFramePointer) { 6119 movptr(rbp, rsp); 6120 addptr(rbp, framesize + wordSize); 6121 } 6122 } 6123 6124 if (VerifyStackAtCalls) { // Majik cookie to verify stack depth 6125 framesize -= wordSize; 6126 movptr(Address(rsp, framesize), (int32_t)0xbadb100d); 6127 } 6128 6129 #ifndef _LP64 6130 // If method sets FPU control word do it now 6131 if (fp_mode_24b) { 6132 fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_24())); 6133 } 6134 if (UseSSE >= 2 && VerifyFPU) { 6135 verify_FPU(0, "FPU stack must be clean on entry"); 6136 } 6137 #endif 6138 6139 #ifdef ASSERT 6140 if (VerifyStackAtCalls) { 6141 Label L; 6142 push(rax); 6143 mov(rax, rsp); 6144 andptr(rax, StackAlignmentInBytes-1); 6145 cmpptr(rax, StackAlignmentInBytes-wordSize); 6146 pop(rax); 6147 jcc(Assembler::equal, L); 6148 STOP("Stack is not properly aligned!"); 6149 bind(L); 6150 } 6151 #endif 6152 6153 } 6154 6155 void MacroAssembler::clear_mem(Register base, Register cnt, Register tmp) { 6156 // cnt - number of qwords (8-byte words). 6157 // base - start address, qword aligned. 6158 assert(base==rdi, "base register must be edi for rep stos"); 6159 assert(tmp==rax, "tmp register must be eax for rep stos"); 6160 assert(cnt==rcx, "cnt register must be ecx for rep stos"); 6161 6162 xorptr(tmp, tmp); 6163 if (UseFastStosb) { 6164 shlptr(cnt,3); // convert to number of bytes 6165 rep_stosb(); 6166 } else { 6167 NOT_LP64(shlptr(cnt,1);) // convert to number of dwords for 32-bit VM 6168 rep_stos(); 6169 } 6170 } 6171 6172 // IndexOf for constant substrings with size >= 8 chars 6173 // which don't need to be loaded through stack. 6174 void MacroAssembler::string_indexofC8(Register str1, Register str2, 6175 Register cnt1, Register cnt2, 6176 int int_cnt2, Register result, 6177 XMMRegister vec, Register tmp) { 6178 ShortBranchVerifier sbv(this); 6179 assert(UseSSE42Intrinsics, "SSE4.2 is required"); 6180 6181 // This method uses pcmpestri instruction with bound registers 6182 // inputs: 6183 // xmm - substring 6184 // rax - substring length (elements count) 6185 // mem - scanned string 6186 // rdx - string length (elements count) 6187 // 0xd - mode: 1100 (substring search) + 01 (unsigned shorts) 6188 // outputs: 6189 // rcx - matched index in string 6190 assert(cnt1 == rdx && cnt2 == rax && tmp == rcx, "pcmpestri"); 6191 6192 Label RELOAD_SUBSTR, SCAN_TO_SUBSTR, SCAN_SUBSTR, 6193 RET_FOUND, RET_NOT_FOUND, EXIT, FOUND_SUBSTR, 6194 MATCH_SUBSTR_HEAD, RELOAD_STR, FOUND_CANDIDATE; 6195 6196 // Note, inline_string_indexOf() generates checks: 6197 // if (substr.count > string.count) return -1; 6198 // if (substr.count == 0) return 0; 6199 assert(int_cnt2 >= 8, "this code isused only for cnt2 >= 8 chars"); 6200 6201 // Load substring. 6202 movdqu(vec, Address(str2, 0)); 6203 movl(cnt2, int_cnt2); 6204 movptr(result, str1); // string addr 6205 6206 if (int_cnt2 > 8) { 6207 jmpb(SCAN_TO_SUBSTR); 6208 6209 // Reload substr for rescan, this code 6210 // is executed only for large substrings (> 8 chars) 6211 bind(RELOAD_SUBSTR); 6212 movdqu(vec, Address(str2, 0)); 6213 negptr(cnt2); // Jumped here with negative cnt2, convert to positive 6214 6215 bind(RELOAD_STR); 6216 // We came here after the beginning of the substring was 6217 // matched but the rest of it was not so we need to search 6218 // again. Start from the next element after the previous match. 6219 6220 // cnt2 is number of substring reminding elements and 6221 // cnt1 is number of string reminding elements when cmp failed. 6222 // Restored cnt1 = cnt1 - cnt2 + int_cnt2 6223 subl(cnt1, cnt2); 6224 addl(cnt1, int_cnt2); 6225 movl(cnt2, int_cnt2); // Now restore cnt2 6226 6227 decrementl(cnt1); // Shift to next element 6228 cmpl(cnt1, cnt2); 6229 jccb(Assembler::negative, RET_NOT_FOUND); // Left less then substring 6230 6231 addptr(result, 2); 6232 6233 } // (int_cnt2 > 8) 6234 6235 // Scan string for start of substr in 16-byte vectors 6236 bind(SCAN_TO_SUBSTR); 6237 pcmpestri(vec, Address(result, 0), 0x0d); 6238 jccb(Assembler::below, FOUND_CANDIDATE); // CF == 1 6239 subl(cnt1, 8); 6240 jccb(Assembler::lessEqual, RET_NOT_FOUND); // Scanned full string 6241 cmpl(cnt1, cnt2); 6242 jccb(Assembler::negative, RET_NOT_FOUND); // Left less then substring 6243 addptr(result, 16); 6244 jmpb(SCAN_TO_SUBSTR); 6245 6246 // Found a potential substr 6247 bind(FOUND_CANDIDATE); 6248 // Matched whole vector if first element matched (tmp(rcx) == 0). 6249 if (int_cnt2 == 8) { 6250 jccb(Assembler::overflow, RET_FOUND); // OF == 1 6251 } else { // int_cnt2 > 8 6252 jccb(Assembler::overflow, FOUND_SUBSTR); 6253 } 6254 // After pcmpestri tmp(rcx) contains matched element index 6255 // Compute start addr of substr 6256 lea(result, Address(result, tmp, Address::times_2)); 6257 6258 // Make sure string is still long enough 6259 subl(cnt1, tmp); 6260 cmpl(cnt1, cnt2); 6261 if (int_cnt2 == 8) { 6262 jccb(Assembler::greaterEqual, SCAN_TO_SUBSTR); 6263 } else { // int_cnt2 > 8 6264 jccb(Assembler::greaterEqual, MATCH_SUBSTR_HEAD); 6265 } 6266 // Left less then substring. 6267 6268 bind(RET_NOT_FOUND); 6269 movl(result, -1); 6270 jmpb(EXIT); 6271 6272 if (int_cnt2 > 8) { 6273 // This code is optimized for the case when whole substring 6274 // is matched if its head is matched. 6275 bind(MATCH_SUBSTR_HEAD); 6276 pcmpestri(vec, Address(result, 0), 0x0d); 6277 // Reload only string if does not match 6278 jccb(Assembler::noOverflow, RELOAD_STR); // OF == 0 6279 6280 Label CONT_SCAN_SUBSTR; 6281 // Compare the rest of substring (> 8 chars). 6282 bind(FOUND_SUBSTR); 6283 // First 8 chars are already matched. 6284 negptr(cnt2); 6285 addptr(cnt2, 8); 6286 6287 bind(SCAN_SUBSTR); 6288 subl(cnt1, 8); 6289 cmpl(cnt2, -8); // Do not read beyond substring 6290 jccb(Assembler::lessEqual, CONT_SCAN_SUBSTR); 6291 // Back-up strings to avoid reading beyond substring: 6292 // cnt1 = cnt1 - cnt2 + 8 6293 addl(cnt1, cnt2); // cnt2 is negative 6294 addl(cnt1, 8); 6295 movl(cnt2, 8); negptr(cnt2); 6296 bind(CONT_SCAN_SUBSTR); 6297 if (int_cnt2 < (int)G) { 6298 movdqu(vec, Address(str2, cnt2, Address::times_2, int_cnt2*2)); 6299 pcmpestri(vec, Address(result, cnt2, Address::times_2, int_cnt2*2), 0x0d); 6300 } else { 6301 // calculate index in register to avoid integer overflow (int_cnt2*2) 6302 movl(tmp, int_cnt2); 6303 addptr(tmp, cnt2); 6304 movdqu(vec, Address(str2, tmp, Address::times_2, 0)); 6305 pcmpestri(vec, Address(result, tmp, Address::times_2, 0), 0x0d); 6306 } 6307 // Need to reload strings pointers if not matched whole vector 6308 jcc(Assembler::noOverflow, RELOAD_SUBSTR); // OF == 0 6309 addptr(cnt2, 8); 6310 jcc(Assembler::negative, SCAN_SUBSTR); 6311 // Fall through if found full substring 6312 6313 } // (int_cnt2 > 8) 6314 6315 bind(RET_FOUND); 6316 // Found result if we matched full small substring. 6317 // Compute substr offset 6318 subptr(result, str1); 6319 shrl(result, 1); // index 6320 bind(EXIT); 6321 6322 } // string_indexofC8 6323 6324 // Small strings are loaded through stack if they cross page boundary. 6325 void MacroAssembler::string_indexof(Register str1, Register str2, 6326 Register cnt1, Register cnt2, 6327 int int_cnt2, Register result, 6328 XMMRegister vec, Register tmp) { 6329 ShortBranchVerifier sbv(this); 6330 assert(UseSSE42Intrinsics, "SSE4.2 is required"); 6331 // 6332 // int_cnt2 is length of small (< 8 chars) constant substring 6333 // or (-1) for non constant substring in which case its length 6334 // is in cnt2 register. 6335 // 6336 // Note, inline_string_indexOf() generates checks: 6337 // if (substr.count > string.count) return -1; 6338 // if (substr.count == 0) return 0; 6339 // 6340 assert(int_cnt2 == -1 || (0 < int_cnt2 && int_cnt2 < 8), "should be != 0"); 6341 6342 // This method uses pcmpestri instruction with bound registers 6343 // inputs: 6344 // xmm - substring 6345 // rax - substring length (elements count) 6346 // mem - scanned string 6347 // rdx - string length (elements count) 6348 // 0xd - mode: 1100 (substring search) + 01 (unsigned shorts) 6349 // outputs: 6350 // rcx - matched index in string 6351 assert(cnt1 == rdx && cnt2 == rax && tmp == rcx, "pcmpestri"); 6352 6353 Label RELOAD_SUBSTR, SCAN_TO_SUBSTR, SCAN_SUBSTR, ADJUST_STR, 6354 RET_FOUND, RET_NOT_FOUND, CLEANUP, FOUND_SUBSTR, 6355 FOUND_CANDIDATE; 6356 6357 { //======================================================== 6358 // We don't know where these strings are located 6359 // and we can't read beyond them. Load them through stack. 6360 Label BIG_STRINGS, CHECK_STR, COPY_SUBSTR, COPY_STR; 6361 6362 movptr(tmp, rsp); // save old SP 6363 6364 if (int_cnt2 > 0) { // small (< 8 chars) constant substring 6365 if (int_cnt2 == 1) { // One char 6366 load_unsigned_short(result, Address(str2, 0)); 6367 movdl(vec, result); // move 32 bits 6368 } else if (int_cnt2 == 2) { // Two chars 6369 movdl(vec, Address(str2, 0)); // move 32 bits 6370 } else if (int_cnt2 == 4) { // Four chars 6371 movq(vec, Address(str2, 0)); // move 64 bits 6372 } else { // cnt2 = { 3, 5, 6, 7 } 6373 // Array header size is 12 bytes in 32-bit VM 6374 // + 6 bytes for 3 chars == 18 bytes, 6375 // enough space to load vec and shift. 6376 assert(HeapWordSize*TypeArrayKlass::header_size() >= 12,"sanity"); 6377 movdqu(vec, Address(str2, (int_cnt2*2)-16)); 6378 psrldq(vec, 16-(int_cnt2*2)); 6379 } 6380 } else { // not constant substring 6381 cmpl(cnt2, 8); 6382 jccb(Assembler::aboveEqual, BIG_STRINGS); // Both strings are big enough 6383 6384 // We can read beyond string if srt+16 does not cross page boundary 6385 // since heaps are aligned and mapped by pages. 6386 assert(os::vm_page_size() < (int)G, "default page should be small"); 6387 movl(result, str2); // We need only low 32 bits 6388 andl(result, (os::vm_page_size()-1)); 6389 cmpl(result, (os::vm_page_size()-16)); 6390 jccb(Assembler::belowEqual, CHECK_STR); 6391 6392 // Move small strings to stack to allow load 16 bytes into vec. 6393 subptr(rsp, 16); 6394 int stk_offset = wordSize-2; 6395 push(cnt2); 6396 6397 bind(COPY_SUBSTR); 6398 load_unsigned_short(result, Address(str2, cnt2, Address::times_2, -2)); 6399 movw(Address(rsp, cnt2, Address::times_2, stk_offset), result); 6400 decrement(cnt2); 6401 jccb(Assembler::notZero, COPY_SUBSTR); 6402 6403 pop(cnt2); 6404 movptr(str2, rsp); // New substring address 6405 } // non constant 6406 6407 bind(CHECK_STR); 6408 cmpl(cnt1, 8); 6409 jccb(Assembler::aboveEqual, BIG_STRINGS); 6410 6411 // Check cross page boundary. 6412 movl(result, str1); // We need only low 32 bits 6413 andl(result, (os::vm_page_size()-1)); 6414 cmpl(result, (os::vm_page_size()-16)); 6415 jccb(Assembler::belowEqual, BIG_STRINGS); 6416 6417 subptr(rsp, 16); 6418 int stk_offset = -2; 6419 if (int_cnt2 < 0) { // not constant 6420 push(cnt2); 6421 stk_offset += wordSize; 6422 } 6423 movl(cnt2, cnt1); 6424 6425 bind(COPY_STR); 6426 load_unsigned_short(result, Address(str1, cnt2, Address::times_2, -2)); 6427 movw(Address(rsp, cnt2, Address::times_2, stk_offset), result); 6428 decrement(cnt2); 6429 jccb(Assembler::notZero, COPY_STR); 6430 6431 if (int_cnt2 < 0) { // not constant 6432 pop(cnt2); 6433 } 6434 movptr(str1, rsp); // New string address 6435 6436 bind(BIG_STRINGS); 6437 // Load substring. 6438 if (int_cnt2 < 0) { // -1 6439 movdqu(vec, Address(str2, 0)); 6440 push(cnt2); // substr count 6441 push(str2); // substr addr 6442 push(str1); // string addr 6443 } else { 6444 // Small (< 8 chars) constant substrings are loaded already. 6445 movl(cnt2, int_cnt2); 6446 } 6447 push(tmp); // original SP 6448 6449 } // Finished loading 6450 6451 //======================================================== 6452 // Start search 6453 // 6454 6455 movptr(result, str1); // string addr 6456 6457 if (int_cnt2 < 0) { // Only for non constant substring 6458 jmpb(SCAN_TO_SUBSTR); 6459 6460 // SP saved at sp+0 6461 // String saved at sp+1*wordSize 6462 // Substr saved at sp+2*wordSize 6463 // Substr count saved at sp+3*wordSize 6464 6465 // Reload substr for rescan, this code 6466 // is executed only for large substrings (> 8 chars) 6467 bind(RELOAD_SUBSTR); 6468 movptr(str2, Address(rsp, 2*wordSize)); 6469 movl(cnt2, Address(rsp, 3*wordSize)); 6470 movdqu(vec, Address(str2, 0)); 6471 // We came here after the beginning of the substring was 6472 // matched but the rest of it was not so we need to search 6473 // again. Start from the next element after the previous match. 6474 subptr(str1, result); // Restore counter 6475 shrl(str1, 1); 6476 addl(cnt1, str1); 6477 decrementl(cnt1); // Shift to next element 6478 cmpl(cnt1, cnt2); 6479 jccb(Assembler::negative, RET_NOT_FOUND); // Left less then substring 6480 6481 addptr(result, 2); 6482 } // non constant 6483 6484 // Scan string for start of substr in 16-byte vectors 6485 bind(SCAN_TO_SUBSTR); 6486 assert(cnt1 == rdx && cnt2 == rax && tmp == rcx, "pcmpestri"); 6487 pcmpestri(vec, Address(result, 0), 0x0d); 6488 jccb(Assembler::below, FOUND_CANDIDATE); // CF == 1 6489 subl(cnt1, 8); 6490 jccb(Assembler::lessEqual, RET_NOT_FOUND); // Scanned full string 6491 cmpl(cnt1, cnt2); 6492 jccb(Assembler::negative, RET_NOT_FOUND); // Left less then substring 6493 addptr(result, 16); 6494 6495 bind(ADJUST_STR); 6496 cmpl(cnt1, 8); // Do not read beyond string 6497 jccb(Assembler::greaterEqual, SCAN_TO_SUBSTR); 6498 // Back-up string to avoid reading beyond string. 6499 lea(result, Address(result, cnt1, Address::times_2, -16)); 6500 movl(cnt1, 8); 6501 jmpb(SCAN_TO_SUBSTR); 6502 6503 // Found a potential substr 6504 bind(FOUND_CANDIDATE); 6505 // After pcmpestri tmp(rcx) contains matched element index 6506 6507 // Make sure string is still long enough 6508 subl(cnt1, tmp); 6509 cmpl(cnt1, cnt2); 6510 jccb(Assembler::greaterEqual, FOUND_SUBSTR); 6511 // Left less then substring. 6512 6513 bind(RET_NOT_FOUND); 6514 movl(result, -1); 6515 jmpb(CLEANUP); 6516 6517 bind(FOUND_SUBSTR); 6518 // Compute start addr of substr 6519 lea(result, Address(result, tmp, Address::times_2)); 6520 6521 if (int_cnt2 > 0) { // Constant substring 6522 // Repeat search for small substring (< 8 chars) 6523 // from new point without reloading substring. 6524 // Have to check that we don't read beyond string. 6525 cmpl(tmp, 8-int_cnt2); 6526 jccb(Assembler::greater, ADJUST_STR); 6527 // Fall through if matched whole substring. 6528 } else { // non constant 6529 assert(int_cnt2 == -1, "should be != 0"); 6530 6531 addl(tmp, cnt2); 6532 // Found result if we matched whole substring. 6533 cmpl(tmp, 8); 6534 jccb(Assembler::lessEqual, RET_FOUND); 6535 6536 // Repeat search for small substring (<= 8 chars) 6537 // from new point 'str1' without reloading substring. 6538 cmpl(cnt2, 8); 6539 // Have to check that we don't read beyond string. 6540 jccb(Assembler::lessEqual, ADJUST_STR); 6541 6542 Label CHECK_NEXT, CONT_SCAN_SUBSTR, RET_FOUND_LONG; 6543 // Compare the rest of substring (> 8 chars). 6544 movptr(str1, result); 6545 6546 cmpl(tmp, cnt2); 6547 // First 8 chars are already matched. 6548 jccb(Assembler::equal, CHECK_NEXT); 6549 6550 bind(SCAN_SUBSTR); 6551 pcmpestri(vec, Address(str1, 0), 0x0d); 6552 // Need to reload strings pointers if not matched whole vector 6553 jcc(Assembler::noOverflow, RELOAD_SUBSTR); // OF == 0 6554 6555 bind(CHECK_NEXT); 6556 subl(cnt2, 8); 6557 jccb(Assembler::lessEqual, RET_FOUND_LONG); // Found full substring 6558 addptr(str1, 16); 6559 addptr(str2, 16); 6560 subl(cnt1, 8); 6561 cmpl(cnt2, 8); // Do not read beyond substring 6562 jccb(Assembler::greaterEqual, CONT_SCAN_SUBSTR); 6563 // Back-up strings to avoid reading beyond substring. 6564 lea(str2, Address(str2, cnt2, Address::times_2, -16)); 6565 lea(str1, Address(str1, cnt2, Address::times_2, -16)); 6566 subl(cnt1, cnt2); 6567 movl(cnt2, 8); 6568 addl(cnt1, 8); 6569 bind(CONT_SCAN_SUBSTR); 6570 movdqu(vec, Address(str2, 0)); 6571 jmpb(SCAN_SUBSTR); 6572 6573 bind(RET_FOUND_LONG); 6574 movptr(str1, Address(rsp, wordSize)); 6575 } // non constant 6576 6577 bind(RET_FOUND); 6578 // Compute substr offset 6579 subptr(result, str1); 6580 shrl(result, 1); // index 6581 6582 bind(CLEANUP); 6583 pop(rsp); // restore SP 6584 6585 } // string_indexof 6586 6587 // Compare strings. 6588 void MacroAssembler::string_compare(Register str1, Register str2, 6589 Register cnt1, Register cnt2, Register result, 6590 XMMRegister vec1) { 6591 ShortBranchVerifier sbv(this); 6592 Label LENGTH_DIFF_LABEL, POP_LABEL, DONE_LABEL, WHILE_HEAD_LABEL; 6593 6594 // Compute the minimum of the string lengths and the 6595 // difference of the string lengths (stack). 6596 // Do the conditional move stuff 6597 movl(result, cnt1); 6598 subl(cnt1, cnt2); 6599 push(cnt1); 6600 cmov32(Assembler::lessEqual, cnt2, result); 6601 6602 // Is the minimum length zero? 6603 testl(cnt2, cnt2); 6604 jcc(Assembler::zero, LENGTH_DIFF_LABEL); 6605 6606 // Compare first characters 6607 load_unsigned_short(result, Address(str1, 0)); 6608 load_unsigned_short(cnt1, Address(str2, 0)); 6609 subl(result, cnt1); 6610 jcc(Assembler::notZero, POP_LABEL); 6611 cmpl(cnt2, 1); 6612 jcc(Assembler::equal, LENGTH_DIFF_LABEL); 6613 6614 // Check if the strings start at the same location. 6615 cmpptr(str1, str2); 6616 jcc(Assembler::equal, LENGTH_DIFF_LABEL); 6617 6618 Address::ScaleFactor scale = Address::times_2; 6619 int stride = 8; 6620 6621 if (UseAVX >= 2 && UseSSE42Intrinsics) { 6622 Label COMPARE_WIDE_VECTORS, VECTOR_NOT_EQUAL, COMPARE_WIDE_TAIL, COMPARE_SMALL_STR; 6623 Label COMPARE_WIDE_VECTORS_LOOP, COMPARE_16_CHARS, COMPARE_INDEX_CHAR; 6624 Label COMPARE_TAIL_LONG; 6625 int pcmpmask = 0x19; 6626 6627 // Setup to compare 16-chars (32-bytes) vectors, 6628 // start from first character again because it has aligned address. 6629 int stride2 = 16; 6630 int adr_stride = stride << scale; 6631 6632 assert(result == rax && cnt2 == rdx && cnt1 == rcx, "pcmpestri"); 6633 // rax and rdx are used by pcmpestri as elements counters 6634 movl(result, cnt2); 6635 andl(cnt2, ~(stride2-1)); // cnt2 holds the vector count 6636 jcc(Assembler::zero, COMPARE_TAIL_LONG); 6637 6638 // fast path : compare first 2 8-char vectors. 6639 bind(COMPARE_16_CHARS); 6640 movdqu(vec1, Address(str1, 0)); 6641 pcmpestri(vec1, Address(str2, 0), pcmpmask); 6642 jccb(Assembler::below, COMPARE_INDEX_CHAR); 6643 6644 movdqu(vec1, Address(str1, adr_stride)); 6645 pcmpestri(vec1, Address(str2, adr_stride), pcmpmask); 6646 jccb(Assembler::aboveEqual, COMPARE_WIDE_VECTORS); 6647 addl(cnt1, stride); 6648 6649 // Compare the characters at index in cnt1 6650 bind(COMPARE_INDEX_CHAR); //cnt1 has the offset of the mismatching character 6651 load_unsigned_short(result, Address(str1, cnt1, scale)); 6652 load_unsigned_short(cnt2, Address(str2, cnt1, scale)); 6653 subl(result, cnt2); 6654 jmp(POP_LABEL); 6655 6656 // Setup the registers to start vector comparison loop 6657 bind(COMPARE_WIDE_VECTORS); 6658 lea(str1, Address(str1, result, scale)); 6659 lea(str2, Address(str2, result, scale)); 6660 subl(result, stride2); 6661 subl(cnt2, stride2); 6662 jccb(Assembler::zero, COMPARE_WIDE_TAIL); 6663 negptr(result); 6664 6665 // In a loop, compare 16-chars (32-bytes) at once using (vpxor+vptest) 6666 bind(COMPARE_WIDE_VECTORS_LOOP); 6667 vmovdqu(vec1, Address(str1, result, scale)); 6668 vpxor(vec1, Address(str2, result, scale)); 6669 vptest(vec1, vec1); 6670 jccb(Assembler::notZero, VECTOR_NOT_EQUAL); 6671 addptr(result, stride2); 6672 subl(cnt2, stride2); 6673 jccb(Assembler::notZero, COMPARE_WIDE_VECTORS_LOOP); 6674 // clean upper bits of YMM registers 6675 vpxor(vec1, vec1); 6676 6677 // compare wide vectors tail 6678 bind(COMPARE_WIDE_TAIL); 6679 testptr(result, result); 6680 jccb(Assembler::zero, LENGTH_DIFF_LABEL); 6681 6682 movl(result, stride2); 6683 movl(cnt2, result); 6684 negptr(result); 6685 jmpb(COMPARE_WIDE_VECTORS_LOOP); 6686 6687 // Identifies the mismatching (higher or lower)16-bytes in the 32-byte vectors. 6688 bind(VECTOR_NOT_EQUAL); 6689 // clean upper bits of YMM registers 6690 vpxor(vec1, vec1); 6691 lea(str1, Address(str1, result, scale)); 6692 lea(str2, Address(str2, result, scale)); 6693 jmp(COMPARE_16_CHARS); 6694 6695 // Compare tail chars, length between 1 to 15 chars 6696 bind(COMPARE_TAIL_LONG); 6697 movl(cnt2, result); 6698 cmpl(cnt2, stride); 6699 jccb(Assembler::less, COMPARE_SMALL_STR); 6700 6701 movdqu(vec1, Address(str1, 0)); 6702 pcmpestri(vec1, Address(str2, 0), pcmpmask); 6703 jcc(Assembler::below, COMPARE_INDEX_CHAR); 6704 subptr(cnt2, stride); 6705 jccb(Assembler::zero, LENGTH_DIFF_LABEL); 6706 lea(str1, Address(str1, result, scale)); 6707 lea(str2, Address(str2, result, scale)); 6708 negptr(cnt2); 6709 jmpb(WHILE_HEAD_LABEL); 6710 6711 bind(COMPARE_SMALL_STR); 6712 } else if (UseSSE42Intrinsics) { 6713 Label COMPARE_WIDE_VECTORS, VECTOR_NOT_EQUAL, COMPARE_TAIL; 6714 int pcmpmask = 0x19; 6715 // Setup to compare 8-char (16-byte) vectors, 6716 // start from first character again because it has aligned address. 6717 movl(result, cnt2); 6718 andl(cnt2, ~(stride - 1)); // cnt2 holds the vector count 6719 jccb(Assembler::zero, COMPARE_TAIL); 6720 6721 lea(str1, Address(str1, result, scale)); 6722 lea(str2, Address(str2, result, scale)); 6723 negptr(result); 6724 6725 // pcmpestri 6726 // inputs: 6727 // vec1- substring 6728 // rax - negative string length (elements count) 6729 // mem - scanned string 6730 // rdx - string length (elements count) 6731 // pcmpmask - cmp mode: 11000 (string compare with negated result) 6732 // + 00 (unsigned bytes) or + 01 (unsigned shorts) 6733 // outputs: 6734 // rcx - first mismatched element index 6735 assert(result == rax && cnt2 == rdx && cnt1 == rcx, "pcmpestri"); 6736 6737 bind(COMPARE_WIDE_VECTORS); 6738 movdqu(vec1, Address(str1, result, scale)); 6739 pcmpestri(vec1, Address(str2, result, scale), pcmpmask); 6740 // After pcmpestri cnt1(rcx) contains mismatched element index 6741 6742 jccb(Assembler::below, VECTOR_NOT_EQUAL); // CF==1 6743 addptr(result, stride); 6744 subptr(cnt2, stride); 6745 jccb(Assembler::notZero, COMPARE_WIDE_VECTORS); 6746 6747 // compare wide vectors tail 6748 testptr(result, result); 6749 jccb(Assembler::zero, LENGTH_DIFF_LABEL); 6750 6751 movl(cnt2, stride); 6752 movl(result, stride); 6753 negptr(result); 6754 movdqu(vec1, Address(str1, result, scale)); 6755 pcmpestri(vec1, Address(str2, result, scale), pcmpmask); 6756 jccb(Assembler::aboveEqual, LENGTH_DIFF_LABEL); 6757 6758 // Mismatched characters in the vectors 6759 bind(VECTOR_NOT_EQUAL); 6760 addptr(cnt1, result); 6761 load_unsigned_short(result, Address(str1, cnt1, scale)); 6762 load_unsigned_short(cnt2, Address(str2, cnt1, scale)); 6763 subl(result, cnt2); 6764 jmpb(POP_LABEL); 6765 6766 bind(COMPARE_TAIL); // limit is zero 6767 movl(cnt2, result); 6768 // Fallthru to tail compare 6769 } 6770 // Shift str2 and str1 to the end of the arrays, negate min 6771 lea(str1, Address(str1, cnt2, scale)); 6772 lea(str2, Address(str2, cnt2, scale)); 6773 decrementl(cnt2); // first character was compared already 6774 negptr(cnt2); 6775 6776 // Compare the rest of the elements 6777 bind(WHILE_HEAD_LABEL); 6778 load_unsigned_short(result, Address(str1, cnt2, scale, 0)); 6779 load_unsigned_short(cnt1, Address(str2, cnt2, scale, 0)); 6780 subl(result, cnt1); 6781 jccb(Assembler::notZero, POP_LABEL); 6782 increment(cnt2); 6783 jccb(Assembler::notZero, WHILE_HEAD_LABEL); 6784 6785 // Strings are equal up to min length. Return the length difference. 6786 bind(LENGTH_DIFF_LABEL); 6787 pop(result); 6788 jmpb(DONE_LABEL); 6789 6790 // Discard the stored length difference 6791 bind(POP_LABEL); 6792 pop(cnt1); 6793 6794 // That's it 6795 bind(DONE_LABEL); 6796 } 6797 6798 // Compare char[] arrays aligned to 4 bytes or substrings. 6799 void MacroAssembler::char_arrays_equals(bool is_array_equ, Register ary1, Register ary2, 6800 Register limit, Register result, Register chr, 6801 XMMRegister vec1, XMMRegister vec2) { 6802 ShortBranchVerifier sbv(this); 6803 Label TRUE_LABEL, FALSE_LABEL, DONE, COMPARE_VECTORS, COMPARE_CHAR; 6804 6805 int length_offset = arrayOopDesc::length_offset_in_bytes(); 6806 int base_offset = arrayOopDesc::base_offset_in_bytes(T_CHAR); 6807 6808 // Check the input args 6809 cmpptr(ary1, ary2); 6810 jcc(Assembler::equal, TRUE_LABEL); 6811 6812 if (is_array_equ) { 6813 // Need additional checks for arrays_equals. 6814 testptr(ary1, ary1); 6815 jcc(Assembler::zero, FALSE_LABEL); 6816 testptr(ary2, ary2); 6817 jcc(Assembler::zero, FALSE_LABEL); 6818 6819 // Check the lengths 6820 movl(limit, Address(ary1, length_offset)); 6821 cmpl(limit, Address(ary2, length_offset)); 6822 jcc(Assembler::notEqual, FALSE_LABEL); 6823 } 6824 6825 // count == 0 6826 testl(limit, limit); 6827 jcc(Assembler::zero, TRUE_LABEL); 6828 6829 if (is_array_equ) { 6830 // Load array address 6831 lea(ary1, Address(ary1, base_offset)); 6832 lea(ary2, Address(ary2, base_offset)); 6833 } 6834 6835 shll(limit, 1); // byte count != 0 6836 movl(result, limit); // copy 6837 6838 if (UseAVX >= 2) { 6839 // With AVX2, use 32-byte vector compare 6840 Label COMPARE_WIDE_VECTORS, COMPARE_TAIL; 6841 6842 // Compare 32-byte vectors 6843 andl(result, 0x0000001e); // tail count (in bytes) 6844 andl(limit, 0xffffffe0); // vector count (in bytes) 6845 jccb(Assembler::zero, COMPARE_TAIL); 6846 6847 lea(ary1, Address(ary1, limit, Address::times_1)); 6848 lea(ary2, Address(ary2, limit, Address::times_1)); 6849 negptr(limit); 6850 6851 bind(COMPARE_WIDE_VECTORS); 6852 vmovdqu(vec1, Address(ary1, limit, Address::times_1)); 6853 vmovdqu(vec2, Address(ary2, limit, Address::times_1)); 6854 vpxor(vec1, vec2); 6855 6856 vptest(vec1, vec1); 6857 jccb(Assembler::notZero, FALSE_LABEL); 6858 addptr(limit, 32); 6859 jcc(Assembler::notZero, COMPARE_WIDE_VECTORS); 6860 6861 testl(result, result); 6862 jccb(Assembler::zero, TRUE_LABEL); 6863 6864 vmovdqu(vec1, Address(ary1, result, Address::times_1, -32)); 6865 vmovdqu(vec2, Address(ary2, result, Address::times_1, -32)); 6866 vpxor(vec1, vec2); 6867 6868 vptest(vec1, vec1); 6869 jccb(Assembler::notZero, FALSE_LABEL); 6870 jmpb(TRUE_LABEL); 6871 6872 bind(COMPARE_TAIL); // limit is zero 6873 movl(limit, result); 6874 // Fallthru to tail compare 6875 } else if (UseSSE42Intrinsics) { 6876 // With SSE4.2, use double quad vector compare 6877 Label COMPARE_WIDE_VECTORS, COMPARE_TAIL; 6878 6879 // Compare 16-byte vectors 6880 andl(result, 0x0000000e); // tail count (in bytes) 6881 andl(limit, 0xfffffff0); // vector count (in bytes) 6882 jccb(Assembler::zero, COMPARE_TAIL); 6883 6884 lea(ary1, Address(ary1, limit, Address::times_1)); 6885 lea(ary2, Address(ary2, limit, Address::times_1)); 6886 negptr(limit); 6887 6888 bind(COMPARE_WIDE_VECTORS); 6889 movdqu(vec1, Address(ary1, limit, Address::times_1)); 6890 movdqu(vec2, Address(ary2, limit, Address::times_1)); 6891 pxor(vec1, vec2); 6892 6893 ptest(vec1, vec1); 6894 jccb(Assembler::notZero, FALSE_LABEL); 6895 addptr(limit, 16); 6896 jcc(Assembler::notZero, COMPARE_WIDE_VECTORS); 6897 6898 testl(result, result); 6899 jccb(Assembler::zero, TRUE_LABEL); 6900 6901 movdqu(vec1, Address(ary1, result, Address::times_1, -16)); 6902 movdqu(vec2, Address(ary2, result, Address::times_1, -16)); 6903 pxor(vec1, vec2); 6904 6905 ptest(vec1, vec1); 6906 jccb(Assembler::notZero, FALSE_LABEL); 6907 jmpb(TRUE_LABEL); 6908 6909 bind(COMPARE_TAIL); // limit is zero 6910 movl(limit, result); 6911 // Fallthru to tail compare 6912 } 6913 6914 // Compare 4-byte vectors 6915 andl(limit, 0xfffffffc); // vector count (in bytes) 6916 jccb(Assembler::zero, COMPARE_CHAR); 6917 6918 lea(ary1, Address(ary1, limit, Address::times_1)); 6919 lea(ary2, Address(ary2, limit, Address::times_1)); 6920 negptr(limit); 6921 6922 bind(COMPARE_VECTORS); 6923 movl(chr, Address(ary1, limit, Address::times_1)); 6924 cmpl(chr, Address(ary2, limit, Address::times_1)); 6925 jccb(Assembler::notEqual, FALSE_LABEL); 6926 addptr(limit, 4); 6927 jcc(Assembler::notZero, COMPARE_VECTORS); 6928 6929 // Compare trailing char (final 2 bytes), if any 6930 bind(COMPARE_CHAR); 6931 testl(result, 0x2); // tail char 6932 jccb(Assembler::zero, TRUE_LABEL); 6933 load_unsigned_short(chr, Address(ary1, 0)); 6934 load_unsigned_short(limit, Address(ary2, 0)); 6935 cmpl(chr, limit); 6936 jccb(Assembler::notEqual, FALSE_LABEL); 6937 6938 bind(TRUE_LABEL); 6939 movl(result, 1); // return true 6940 jmpb(DONE); 6941 6942 bind(FALSE_LABEL); 6943 xorl(result, result); // return false 6944 6945 // That's it 6946 bind(DONE); 6947 if (UseAVX >= 2) { 6948 // clean upper bits of YMM registers 6949 vpxor(vec1, vec1); 6950 vpxor(vec2, vec2); 6951 } 6952 } 6953 6954 void MacroAssembler::generate_fill(BasicType t, bool aligned, 6955 Register to, Register value, Register count, 6956 Register rtmp, XMMRegister xtmp) { 6957 ShortBranchVerifier sbv(this); 6958 assert_different_registers(to, value, count, rtmp); 6959 Label L_exit, L_skip_align1, L_skip_align2, L_fill_byte; 6960 Label L_fill_2_bytes, L_fill_4_bytes; 6961 6962 int shift = -1; 6963 switch (t) { 6964 case T_BYTE: 6965 shift = 2; 6966 break; 6967 case T_SHORT: 6968 shift = 1; 6969 break; 6970 case T_INT: 6971 shift = 0; 6972 break; 6973 default: ShouldNotReachHere(); 6974 } 6975 6976 if (t == T_BYTE) { 6977 andl(value, 0xff); 6978 movl(rtmp, value); 6979 shll(rtmp, 8); 6980 orl(value, rtmp); 6981 } 6982 if (t == T_SHORT) { 6983 andl(value, 0xffff); 6984 } 6985 if (t == T_BYTE || t == T_SHORT) { 6986 movl(rtmp, value); 6987 shll(rtmp, 16); 6988 orl(value, rtmp); 6989 } 6990 6991 cmpl(count, 2<<shift); // Short arrays (< 8 bytes) fill by element 6992 jcc(Assembler::below, L_fill_4_bytes); // use unsigned cmp 6993 if (!UseUnalignedLoadStores && !aligned && (t == T_BYTE || t == T_SHORT)) { 6994 // align source address at 4 bytes address boundary 6995 if (t == T_BYTE) { 6996 // One byte misalignment happens only for byte arrays 6997 testptr(to, 1); 6998 jccb(Assembler::zero, L_skip_align1); 6999 movb(Address(to, 0), value); 7000 increment(to); 7001 decrement(count); 7002 BIND(L_skip_align1); 7003 } 7004 // Two bytes misalignment happens only for byte and short (char) arrays 7005 testptr(to, 2); 7006 jccb(Assembler::zero, L_skip_align2); 7007 movw(Address(to, 0), value); 7008 addptr(to, 2); 7009 subl(count, 1<<(shift-1)); 7010 BIND(L_skip_align2); 7011 } 7012 if (UseSSE < 2) { 7013 Label L_fill_32_bytes_loop, L_check_fill_8_bytes, L_fill_8_bytes_loop, L_fill_8_bytes; 7014 // Fill 32-byte chunks 7015 subl(count, 8 << shift); 7016 jcc(Assembler::less, L_check_fill_8_bytes); 7017 align(16); 7018 7019 BIND(L_fill_32_bytes_loop); 7020 7021 for (int i = 0; i < 32; i += 4) { 7022 movl(Address(to, i), value); 7023 } 7024 7025 addptr(to, 32); 7026 subl(count, 8 << shift); 7027 jcc(Assembler::greaterEqual, L_fill_32_bytes_loop); 7028 BIND(L_check_fill_8_bytes); 7029 addl(count, 8 << shift); 7030 jccb(Assembler::zero, L_exit); 7031 jmpb(L_fill_8_bytes); 7032 7033 // 7034 // length is too short, just fill qwords 7035 // 7036 BIND(L_fill_8_bytes_loop); 7037 movl(Address(to, 0), value); 7038 movl(Address(to, 4), value); 7039 addptr(to, 8); 7040 BIND(L_fill_8_bytes); 7041 subl(count, 1 << (shift + 1)); 7042 jcc(Assembler::greaterEqual, L_fill_8_bytes_loop); 7043 // fall through to fill 4 bytes 7044 } else { 7045 Label L_fill_32_bytes; 7046 if (!UseUnalignedLoadStores) { 7047 // align to 8 bytes, we know we are 4 byte aligned to start 7048 testptr(to, 4); 7049 jccb(Assembler::zero, L_fill_32_bytes); 7050 movl(Address(to, 0), value); 7051 addptr(to, 4); 7052 subl(count, 1<<shift); 7053 } 7054 BIND(L_fill_32_bytes); 7055 { 7056 assert( UseSSE >= 2, "supported cpu only" ); 7057 Label L_fill_32_bytes_loop, L_check_fill_8_bytes, L_fill_8_bytes_loop, L_fill_8_bytes; 7058 if (UseAVX > 2) { 7059 movl(rtmp, 0xffff); 7060 #ifdef _LP64 7061 kmovql(k1, rtmp); 7062 #else 7063 kmovdl(k1, rtmp); 7064 #endif 7065 } 7066 movdl(xtmp, value); 7067 if (UseAVX > 2 && UseUnalignedLoadStores) { 7068 // Fill 64-byte chunks 7069 Label L_fill_64_bytes_loop, L_check_fill_32_bytes; 7070 evpbroadcastd(xtmp, xtmp, Assembler::AVX_512bit); 7071 7072 subl(count, 16 << shift); 7073 jcc(Assembler::less, L_check_fill_32_bytes); 7074 align(16); 7075 7076 BIND(L_fill_64_bytes_loop); 7077 evmovdqu(Address(to, 0), xtmp, Assembler::AVX_512bit); 7078 addptr(to, 64); 7079 subl(count, 16 << shift); 7080 jcc(Assembler::greaterEqual, L_fill_64_bytes_loop); 7081 7082 BIND(L_check_fill_32_bytes); 7083 addl(count, 8 << shift); 7084 jccb(Assembler::less, L_check_fill_8_bytes); 7085 evmovdqu(Address(to, 0), xtmp, Assembler::AVX_256bit); 7086 addptr(to, 32); 7087 subl(count, 8 << shift); 7088 7089 BIND(L_check_fill_8_bytes); 7090 } else if (UseAVX == 2 && UseUnalignedLoadStores) { 7091 // Fill 64-byte chunks 7092 Label L_fill_64_bytes_loop, L_check_fill_32_bytes; 7093 vpbroadcastd(xtmp, xtmp); 7094 7095 subl(count, 16 << shift); 7096 jcc(Assembler::less, L_check_fill_32_bytes); 7097 align(16); 7098 7099 BIND(L_fill_64_bytes_loop); 7100 vmovdqu(Address(to, 0), xtmp); 7101 vmovdqu(Address(to, 32), xtmp); 7102 addptr(to, 64); 7103 subl(count, 16 << shift); 7104 jcc(Assembler::greaterEqual, L_fill_64_bytes_loop); 7105 7106 BIND(L_check_fill_32_bytes); 7107 addl(count, 8 << shift); 7108 jccb(Assembler::less, L_check_fill_8_bytes); 7109 vmovdqu(Address(to, 0), xtmp); 7110 addptr(to, 32); 7111 subl(count, 8 << shift); 7112 7113 BIND(L_check_fill_8_bytes); 7114 // clean upper bits of YMM registers 7115 movdl(xtmp, value); 7116 pshufd(xtmp, xtmp, 0); 7117 } else { 7118 // Fill 32-byte chunks 7119 pshufd(xtmp, xtmp, 0); 7120 7121 subl(count, 8 << shift); 7122 jcc(Assembler::less, L_check_fill_8_bytes); 7123 align(16); 7124 7125 BIND(L_fill_32_bytes_loop); 7126 7127 if (UseUnalignedLoadStores) { 7128 movdqu(Address(to, 0), xtmp); 7129 movdqu(Address(to, 16), xtmp); 7130 } else { 7131 movq(Address(to, 0), xtmp); 7132 movq(Address(to, 8), xtmp); 7133 movq(Address(to, 16), xtmp); 7134 movq(Address(to, 24), xtmp); 7135 } 7136 7137 addptr(to, 32); 7138 subl(count, 8 << shift); 7139 jcc(Assembler::greaterEqual, L_fill_32_bytes_loop); 7140 7141 BIND(L_check_fill_8_bytes); 7142 } 7143 addl(count, 8 << shift); 7144 jccb(Assembler::zero, L_exit); 7145 jmpb(L_fill_8_bytes); 7146 7147 // 7148 // length is too short, just fill qwords 7149 // 7150 BIND(L_fill_8_bytes_loop); 7151 movq(Address(to, 0), xtmp); 7152 addptr(to, 8); 7153 BIND(L_fill_8_bytes); 7154 subl(count, 1 << (shift + 1)); 7155 jcc(Assembler::greaterEqual, L_fill_8_bytes_loop); 7156 } 7157 } 7158 // fill trailing 4 bytes 7159 BIND(L_fill_4_bytes); 7160 testl(count, 1<<shift); 7161 jccb(Assembler::zero, L_fill_2_bytes); 7162 movl(Address(to, 0), value); 7163 if (t == T_BYTE || t == T_SHORT) { 7164 addptr(to, 4); 7165 BIND(L_fill_2_bytes); 7166 // fill trailing 2 bytes 7167 testl(count, 1<<(shift-1)); 7168 jccb(Assembler::zero, L_fill_byte); 7169 movw(Address(to, 0), value); 7170 if (t == T_BYTE) { 7171 addptr(to, 2); 7172 BIND(L_fill_byte); 7173 // fill trailing byte 7174 testl(count, 1); 7175 jccb(Assembler::zero, L_exit); 7176 movb(Address(to, 0), value); 7177 } else { 7178 BIND(L_fill_byte); 7179 } 7180 } else { 7181 BIND(L_fill_2_bytes); 7182 } 7183 BIND(L_exit); 7184 } 7185 7186 // encode char[] to byte[] in ISO_8859_1 7187 void MacroAssembler::encode_iso_array(Register src, Register dst, Register len, 7188 XMMRegister tmp1Reg, XMMRegister tmp2Reg, 7189 XMMRegister tmp3Reg, XMMRegister tmp4Reg, 7190 Register tmp5, Register result) { 7191 // rsi: src 7192 // rdi: dst 7193 // rdx: len 7194 // rcx: tmp5 7195 // rax: result 7196 ShortBranchVerifier sbv(this); 7197 assert_different_registers(src, dst, len, tmp5, result); 7198 Label L_done, L_copy_1_char, L_copy_1_char_exit; 7199 7200 // set result 7201 xorl(result, result); 7202 // check for zero length 7203 testl(len, len); 7204 jcc(Assembler::zero, L_done); 7205 movl(result, len); 7206 7207 // Setup pointers 7208 lea(src, Address(src, len, Address::times_2)); // char[] 7209 lea(dst, Address(dst, len, Address::times_1)); // byte[] 7210 negptr(len); 7211 7212 if (UseSSE42Intrinsics || UseAVX >= 2) { 7213 Label L_chars_8_check, L_copy_8_chars, L_copy_8_chars_exit; 7214 Label L_chars_16_check, L_copy_16_chars, L_copy_16_chars_exit; 7215 7216 if (UseAVX >= 2) { 7217 Label L_chars_32_check, L_copy_32_chars, L_copy_32_chars_exit; 7218 movl(tmp5, 0xff00ff00); // create mask to test for Unicode chars in vector 7219 movdl(tmp1Reg, tmp5); 7220 vpbroadcastd(tmp1Reg, tmp1Reg); 7221 jmpb(L_chars_32_check); 7222 7223 bind(L_copy_32_chars); 7224 vmovdqu(tmp3Reg, Address(src, len, Address::times_2, -64)); 7225 vmovdqu(tmp4Reg, Address(src, len, Address::times_2, -32)); 7226 vpor(tmp2Reg, tmp3Reg, tmp4Reg, /* vector_len */ 1); 7227 vptest(tmp2Reg, tmp1Reg); // check for Unicode chars in vector 7228 jccb(Assembler::notZero, L_copy_32_chars_exit); 7229 vpackuswb(tmp3Reg, tmp3Reg, tmp4Reg, /* vector_len */ 1); 7230 vpermq(tmp4Reg, tmp3Reg, 0xD8, /* vector_len */ 1); 7231 vmovdqu(Address(dst, len, Address::times_1, -32), tmp4Reg); 7232 7233 bind(L_chars_32_check); 7234 addptr(len, 32); 7235 jccb(Assembler::lessEqual, L_copy_32_chars); 7236 7237 bind(L_copy_32_chars_exit); 7238 subptr(len, 16); 7239 jccb(Assembler::greater, L_copy_16_chars_exit); 7240 7241 } else if (UseSSE42Intrinsics) { 7242 movl(tmp5, 0xff00ff00); // create mask to test for Unicode chars in vector 7243 movdl(tmp1Reg, tmp5); 7244 pshufd(tmp1Reg, tmp1Reg, 0); 7245 jmpb(L_chars_16_check); 7246 } 7247 7248 bind(L_copy_16_chars); 7249 if (UseAVX >= 2) { 7250 vmovdqu(tmp2Reg, Address(src, len, Address::times_2, -32)); 7251 vptest(tmp2Reg, tmp1Reg); 7252 jccb(Assembler::notZero, L_copy_16_chars_exit); 7253 vpackuswb(tmp2Reg, tmp2Reg, tmp1Reg, /* vector_len */ 1); 7254 vpermq(tmp3Reg, tmp2Reg, 0xD8, /* vector_len */ 1); 7255 } else { 7256 if (UseAVX > 0) { 7257 movdqu(tmp3Reg, Address(src, len, Address::times_2, -32)); 7258 movdqu(tmp4Reg, Address(src, len, Address::times_2, -16)); 7259 vpor(tmp2Reg, tmp3Reg, tmp4Reg, /* vector_len */ 0); 7260 } else { 7261 movdqu(tmp3Reg, Address(src, len, Address::times_2, -32)); 7262 por(tmp2Reg, tmp3Reg); 7263 movdqu(tmp4Reg, Address(src, len, Address::times_2, -16)); 7264 por(tmp2Reg, tmp4Reg); 7265 } 7266 ptest(tmp2Reg, tmp1Reg); // check for Unicode chars in vector 7267 jccb(Assembler::notZero, L_copy_16_chars_exit); 7268 packuswb(tmp3Reg, tmp4Reg); 7269 } 7270 movdqu(Address(dst, len, Address::times_1, -16), tmp3Reg); 7271 7272 bind(L_chars_16_check); 7273 addptr(len, 16); 7274 jccb(Assembler::lessEqual, L_copy_16_chars); 7275 7276 bind(L_copy_16_chars_exit); 7277 if (UseAVX >= 2) { 7278 // clean upper bits of YMM registers 7279 vpxor(tmp2Reg, tmp2Reg); 7280 vpxor(tmp3Reg, tmp3Reg); 7281 vpxor(tmp4Reg, tmp4Reg); 7282 movdl(tmp1Reg, tmp5); 7283 pshufd(tmp1Reg, tmp1Reg, 0); 7284 } 7285 subptr(len, 8); 7286 jccb(Assembler::greater, L_copy_8_chars_exit); 7287 7288 bind(L_copy_8_chars); 7289 movdqu(tmp3Reg, Address(src, len, Address::times_2, -16)); 7290 ptest(tmp3Reg, tmp1Reg); 7291 jccb(Assembler::notZero, L_copy_8_chars_exit); 7292 packuswb(tmp3Reg, tmp1Reg); 7293 movq(Address(dst, len, Address::times_1, -8), tmp3Reg); 7294 addptr(len, 8); 7295 jccb(Assembler::lessEqual, L_copy_8_chars); 7296 7297 bind(L_copy_8_chars_exit); 7298 subptr(len, 8); 7299 jccb(Assembler::zero, L_done); 7300 } 7301 7302 bind(L_copy_1_char); 7303 load_unsigned_short(tmp5, Address(src, len, Address::times_2, 0)); 7304 testl(tmp5, 0xff00); // check if Unicode char 7305 jccb(Assembler::notZero, L_copy_1_char_exit); 7306 movb(Address(dst, len, Address::times_1, 0), tmp5); 7307 addptr(len, 1); 7308 jccb(Assembler::less, L_copy_1_char); 7309 7310 bind(L_copy_1_char_exit); 7311 addptr(result, len); // len is negative count of not processed elements 7312 bind(L_done); 7313 } 7314 7315 #ifdef _LP64 7316 /** 7317 * Helper for multiply_to_len(). 7318 */ 7319 void MacroAssembler::add2_with_carry(Register dest_hi, Register dest_lo, Register src1, Register src2) { 7320 addq(dest_lo, src1); 7321 adcq(dest_hi, 0); 7322 addq(dest_lo, src2); 7323 adcq(dest_hi, 0); 7324 } 7325 7326 /** 7327 * Multiply 64 bit by 64 bit first loop. 7328 */ 7329 void MacroAssembler::multiply_64_x_64_loop(Register x, Register xstart, Register x_xstart, 7330 Register y, Register y_idx, Register z, 7331 Register carry, Register product, 7332 Register idx, Register kdx) { 7333 // 7334 // jlong carry, x[], y[], z[]; 7335 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx-, kdx--) { 7336 // huge_128 product = y[idx] * x[xstart] + carry; 7337 // z[kdx] = (jlong)product; 7338 // carry = (jlong)(product >>> 64); 7339 // } 7340 // z[xstart] = carry; 7341 // 7342 7343 Label L_first_loop, L_first_loop_exit; 7344 Label L_one_x, L_one_y, L_multiply; 7345 7346 decrementl(xstart); 7347 jcc(Assembler::negative, L_one_x); 7348 7349 movq(x_xstart, Address(x, xstart, Address::times_4, 0)); 7350 rorq(x_xstart, 32); // convert big-endian to little-endian 7351 7352 bind(L_first_loop); 7353 decrementl(idx); 7354 jcc(Assembler::negative, L_first_loop_exit); 7355 decrementl(idx); 7356 jcc(Assembler::negative, L_one_y); 7357 movq(y_idx, Address(y, idx, Address::times_4, 0)); 7358 rorq(y_idx, 32); // convert big-endian to little-endian 7359 bind(L_multiply); 7360 movq(product, x_xstart); 7361 mulq(y_idx); // product(rax) * y_idx -> rdx:rax 7362 addq(product, carry); 7363 adcq(rdx, 0); 7364 subl(kdx, 2); 7365 movl(Address(z, kdx, Address::times_4, 4), product); 7366 shrq(product, 32); 7367 movl(Address(z, kdx, Address::times_4, 0), product); 7368 movq(carry, rdx); 7369 jmp(L_first_loop); 7370 7371 bind(L_one_y); 7372 movl(y_idx, Address(y, 0)); 7373 jmp(L_multiply); 7374 7375 bind(L_one_x); 7376 movl(x_xstart, Address(x, 0)); 7377 jmp(L_first_loop); 7378 7379 bind(L_first_loop_exit); 7380 } 7381 7382 /** 7383 * Multiply 64 bit by 64 bit and add 128 bit. 7384 */ 7385 void MacroAssembler::multiply_add_128_x_128(Register x_xstart, Register y, Register z, 7386 Register yz_idx, Register idx, 7387 Register carry, Register product, int offset) { 7388 // huge_128 product = (y[idx] * x_xstart) + z[kdx] + carry; 7389 // z[kdx] = (jlong)product; 7390 7391 movq(yz_idx, Address(y, idx, Address::times_4, offset)); 7392 rorq(yz_idx, 32); // convert big-endian to little-endian 7393 movq(product, x_xstart); 7394 mulq(yz_idx); // product(rax) * yz_idx -> rdx:product(rax) 7395 movq(yz_idx, Address(z, idx, Address::times_4, offset)); 7396 rorq(yz_idx, 32); // convert big-endian to little-endian 7397 7398 add2_with_carry(rdx, product, carry, yz_idx); 7399 7400 movl(Address(z, idx, Address::times_4, offset+4), product); 7401 shrq(product, 32); 7402 movl(Address(z, idx, Address::times_4, offset), product); 7403 7404 } 7405 7406 /** 7407 * Multiply 128 bit by 128 bit. Unrolled inner loop. 7408 */ 7409 void MacroAssembler::multiply_128_x_128_loop(Register x_xstart, Register y, Register z, 7410 Register yz_idx, Register idx, Register jdx, 7411 Register carry, Register product, 7412 Register carry2) { 7413 // jlong carry, x[], y[], z[]; 7414 // int kdx = ystart+1; 7415 // for (int idx=ystart-2; idx >= 0; idx -= 2) { // Third loop 7416 // huge_128 product = (y[idx+1] * x_xstart) + z[kdx+idx+1] + carry; 7417 // z[kdx+idx+1] = (jlong)product; 7418 // jlong carry2 = (jlong)(product >>> 64); 7419 // product = (y[idx] * x_xstart) + z[kdx+idx] + carry2; 7420 // z[kdx+idx] = (jlong)product; 7421 // carry = (jlong)(product >>> 64); 7422 // } 7423 // idx += 2; 7424 // if (idx > 0) { 7425 // product = (y[idx] * x_xstart) + z[kdx+idx] + carry; 7426 // z[kdx+idx] = (jlong)product; 7427 // carry = (jlong)(product >>> 64); 7428 // } 7429 // 7430 7431 Label L_third_loop, L_third_loop_exit, L_post_third_loop_done; 7432 7433 movl(jdx, idx); 7434 andl(jdx, 0xFFFFFFFC); 7435 shrl(jdx, 2); 7436 7437 bind(L_third_loop); 7438 subl(jdx, 1); 7439 jcc(Assembler::negative, L_third_loop_exit); 7440 subl(idx, 4); 7441 7442 multiply_add_128_x_128(x_xstart, y, z, yz_idx, idx, carry, product, 8); 7443 movq(carry2, rdx); 7444 7445 multiply_add_128_x_128(x_xstart, y, z, yz_idx, idx, carry2, product, 0); 7446 movq(carry, rdx); 7447 jmp(L_third_loop); 7448 7449 bind (L_third_loop_exit); 7450 7451 andl (idx, 0x3); 7452 jcc(Assembler::zero, L_post_third_loop_done); 7453 7454 Label L_check_1; 7455 subl(idx, 2); 7456 jcc(Assembler::negative, L_check_1); 7457 7458 multiply_add_128_x_128(x_xstart, y, z, yz_idx, idx, carry, product, 0); 7459 movq(carry, rdx); 7460 7461 bind (L_check_1); 7462 addl (idx, 0x2); 7463 andl (idx, 0x1); 7464 subl(idx, 1); 7465 jcc(Assembler::negative, L_post_third_loop_done); 7466 7467 movl(yz_idx, Address(y, idx, Address::times_4, 0)); 7468 movq(product, x_xstart); 7469 mulq(yz_idx); // product(rax) * yz_idx -> rdx:product(rax) 7470 movl(yz_idx, Address(z, idx, Address::times_4, 0)); 7471 7472 add2_with_carry(rdx, product, yz_idx, carry); 7473 7474 movl(Address(z, idx, Address::times_4, 0), product); 7475 shrq(product, 32); 7476 7477 shlq(rdx, 32); 7478 orq(product, rdx); 7479 movq(carry, product); 7480 7481 bind(L_post_third_loop_done); 7482 } 7483 7484 /** 7485 * Multiply 128 bit by 128 bit using BMI2. Unrolled inner loop. 7486 * 7487 */ 7488 void MacroAssembler::multiply_128_x_128_bmi2_loop(Register y, Register z, 7489 Register carry, Register carry2, 7490 Register idx, Register jdx, 7491 Register yz_idx1, Register yz_idx2, 7492 Register tmp, Register tmp3, Register tmp4) { 7493 assert(UseBMI2Instructions, "should be used only when BMI2 is available"); 7494 7495 // jlong carry, x[], y[], z[]; 7496 // int kdx = ystart+1; 7497 // for (int idx=ystart-2; idx >= 0; idx -= 2) { // Third loop 7498 // huge_128 tmp3 = (y[idx+1] * rdx) + z[kdx+idx+1] + carry; 7499 // jlong carry2 = (jlong)(tmp3 >>> 64); 7500 // huge_128 tmp4 = (y[idx] * rdx) + z[kdx+idx] + carry2; 7501 // carry = (jlong)(tmp4 >>> 64); 7502 // z[kdx+idx+1] = (jlong)tmp3; 7503 // z[kdx+idx] = (jlong)tmp4; 7504 // } 7505 // idx += 2; 7506 // if (idx > 0) { 7507 // yz_idx1 = (y[idx] * rdx) + z[kdx+idx] + carry; 7508 // z[kdx+idx] = (jlong)yz_idx1; 7509 // carry = (jlong)(yz_idx1 >>> 64); 7510 // } 7511 // 7512 7513 Label L_third_loop, L_third_loop_exit, L_post_third_loop_done; 7514 7515 movl(jdx, idx); 7516 andl(jdx, 0xFFFFFFFC); 7517 shrl(jdx, 2); 7518 7519 bind(L_third_loop); 7520 subl(jdx, 1); 7521 jcc(Assembler::negative, L_third_loop_exit); 7522 subl(idx, 4); 7523 7524 movq(yz_idx1, Address(y, idx, Address::times_4, 8)); 7525 rorxq(yz_idx1, yz_idx1, 32); // convert big-endian to little-endian 7526 movq(yz_idx2, Address(y, idx, Address::times_4, 0)); 7527 rorxq(yz_idx2, yz_idx2, 32); 7528 7529 mulxq(tmp4, tmp3, yz_idx1); // yz_idx1 * rdx -> tmp4:tmp3 7530 mulxq(carry2, tmp, yz_idx2); // yz_idx2 * rdx -> carry2:tmp 7531 7532 movq(yz_idx1, Address(z, idx, Address::times_4, 8)); 7533 rorxq(yz_idx1, yz_idx1, 32); 7534 movq(yz_idx2, Address(z, idx, Address::times_4, 0)); 7535 rorxq(yz_idx2, yz_idx2, 32); 7536 7537 if (VM_Version::supports_adx()) { 7538 adcxq(tmp3, carry); 7539 adoxq(tmp3, yz_idx1); 7540 7541 adcxq(tmp4, tmp); 7542 adoxq(tmp4, yz_idx2); 7543 7544 movl(carry, 0); // does not affect flags 7545 adcxq(carry2, carry); 7546 adoxq(carry2, carry); 7547 } else { 7548 add2_with_carry(tmp4, tmp3, carry, yz_idx1); 7549 add2_with_carry(carry2, tmp4, tmp, yz_idx2); 7550 } 7551 movq(carry, carry2); 7552 7553 movl(Address(z, idx, Address::times_4, 12), tmp3); 7554 shrq(tmp3, 32); 7555 movl(Address(z, idx, Address::times_4, 8), tmp3); 7556 7557 movl(Address(z, idx, Address::times_4, 4), tmp4); 7558 shrq(tmp4, 32); 7559 movl(Address(z, idx, Address::times_4, 0), tmp4); 7560 7561 jmp(L_third_loop); 7562 7563 bind (L_third_loop_exit); 7564 7565 andl (idx, 0x3); 7566 jcc(Assembler::zero, L_post_third_loop_done); 7567 7568 Label L_check_1; 7569 subl(idx, 2); 7570 jcc(Assembler::negative, L_check_1); 7571 7572 movq(yz_idx1, Address(y, idx, Address::times_4, 0)); 7573 rorxq(yz_idx1, yz_idx1, 32); 7574 mulxq(tmp4, tmp3, yz_idx1); // yz_idx1 * rdx -> tmp4:tmp3 7575 movq(yz_idx2, Address(z, idx, Address::times_4, 0)); 7576 rorxq(yz_idx2, yz_idx2, 32); 7577 7578 add2_with_carry(tmp4, tmp3, carry, yz_idx2); 7579 7580 movl(Address(z, idx, Address::times_4, 4), tmp3); 7581 shrq(tmp3, 32); 7582 movl(Address(z, idx, Address::times_4, 0), tmp3); 7583 movq(carry, tmp4); 7584 7585 bind (L_check_1); 7586 addl (idx, 0x2); 7587 andl (idx, 0x1); 7588 subl(idx, 1); 7589 jcc(Assembler::negative, L_post_third_loop_done); 7590 movl(tmp4, Address(y, idx, Address::times_4, 0)); 7591 mulxq(carry2, tmp3, tmp4); // tmp4 * rdx -> carry2:tmp3 7592 movl(tmp4, Address(z, idx, Address::times_4, 0)); 7593 7594 add2_with_carry(carry2, tmp3, tmp4, carry); 7595 7596 movl(Address(z, idx, Address::times_4, 0), tmp3); 7597 shrq(tmp3, 32); 7598 7599 shlq(carry2, 32); 7600 orq(tmp3, carry2); 7601 movq(carry, tmp3); 7602 7603 bind(L_post_third_loop_done); 7604 } 7605 7606 /** 7607 * Code for BigInteger::multiplyToLen() instrinsic. 7608 * 7609 * rdi: x 7610 * rax: xlen 7611 * rsi: y 7612 * rcx: ylen 7613 * r8: z 7614 * r11: zlen 7615 * r12: tmp1 7616 * r13: tmp2 7617 * r14: tmp3 7618 * r15: tmp4 7619 * rbx: tmp5 7620 * 7621 */ 7622 void MacroAssembler::multiply_to_len(Register x, Register xlen, Register y, Register ylen, Register z, Register zlen, 7623 Register tmp1, Register tmp2, Register tmp3, Register tmp4, Register tmp5) { 7624 ShortBranchVerifier sbv(this); 7625 assert_different_registers(x, xlen, y, ylen, z, zlen, tmp1, tmp2, tmp3, tmp4, tmp5, rdx); 7626 7627 push(tmp1); 7628 push(tmp2); 7629 push(tmp3); 7630 push(tmp4); 7631 push(tmp5); 7632 7633 push(xlen); 7634 push(zlen); 7635 7636 const Register idx = tmp1; 7637 const Register kdx = tmp2; 7638 const Register xstart = tmp3; 7639 7640 const Register y_idx = tmp4; 7641 const Register carry = tmp5; 7642 const Register product = xlen; 7643 const Register x_xstart = zlen; // reuse register 7644 7645 // First Loop. 7646 // 7647 // final static long LONG_MASK = 0xffffffffL; 7648 // int xstart = xlen - 1; 7649 // int ystart = ylen - 1; 7650 // long carry = 0; 7651 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx-, kdx--) { 7652 // long product = (y[idx] & LONG_MASK) * (x[xstart] & LONG_MASK) + carry; 7653 // z[kdx] = (int)product; 7654 // carry = product >>> 32; 7655 // } 7656 // z[xstart] = (int)carry; 7657 // 7658 7659 movl(idx, ylen); // idx = ylen; 7660 movl(kdx, zlen); // kdx = xlen+ylen; 7661 xorq(carry, carry); // carry = 0; 7662 7663 Label L_done; 7664 7665 movl(xstart, xlen); 7666 decrementl(xstart); 7667 jcc(Assembler::negative, L_done); 7668 7669 multiply_64_x_64_loop(x, xstart, x_xstart, y, y_idx, z, carry, product, idx, kdx); 7670 7671 Label L_second_loop; 7672 testl(kdx, kdx); 7673 jcc(Assembler::zero, L_second_loop); 7674 7675 Label L_carry; 7676 subl(kdx, 1); 7677 jcc(Assembler::zero, L_carry); 7678 7679 movl(Address(z, kdx, Address::times_4, 0), carry); 7680 shrq(carry, 32); 7681 subl(kdx, 1); 7682 7683 bind(L_carry); 7684 movl(Address(z, kdx, Address::times_4, 0), carry); 7685 7686 // Second and third (nested) loops. 7687 // 7688 // for (int i = xstart-1; i >= 0; i--) { // Second loop 7689 // carry = 0; 7690 // for (int jdx=ystart, k=ystart+1+i; jdx >= 0; jdx--, k--) { // Third loop 7691 // long product = (y[jdx] & LONG_MASK) * (x[i] & LONG_MASK) + 7692 // (z[k] & LONG_MASK) + carry; 7693 // z[k] = (int)product; 7694 // carry = product >>> 32; 7695 // } 7696 // z[i] = (int)carry; 7697 // } 7698 // 7699 // i = xlen, j = tmp1, k = tmp2, carry = tmp5, x[i] = rdx 7700 7701 const Register jdx = tmp1; 7702 7703 bind(L_second_loop); 7704 xorl(carry, carry); // carry = 0; 7705 movl(jdx, ylen); // j = ystart+1 7706 7707 subl(xstart, 1); // i = xstart-1; 7708 jcc(Assembler::negative, L_done); 7709 7710 push (z); 7711 7712 Label L_last_x; 7713 lea(z, Address(z, xstart, Address::times_4, 4)); // z = z + k - j 7714 subl(xstart, 1); // i = xstart-1; 7715 jcc(Assembler::negative, L_last_x); 7716 7717 if (UseBMI2Instructions) { 7718 movq(rdx, Address(x, xstart, Address::times_4, 0)); 7719 rorxq(rdx, rdx, 32); // convert big-endian to little-endian 7720 } else { 7721 movq(x_xstart, Address(x, xstart, Address::times_4, 0)); 7722 rorq(x_xstart, 32); // convert big-endian to little-endian 7723 } 7724 7725 Label L_third_loop_prologue; 7726 bind(L_third_loop_prologue); 7727 7728 push (x); 7729 push (xstart); 7730 push (ylen); 7731 7732 7733 if (UseBMI2Instructions) { 7734 multiply_128_x_128_bmi2_loop(y, z, carry, x, jdx, ylen, product, tmp2, x_xstart, tmp3, tmp4); 7735 } else { // !UseBMI2Instructions 7736 multiply_128_x_128_loop(x_xstart, y, z, y_idx, jdx, ylen, carry, product, x); 7737 } 7738 7739 pop(ylen); 7740 pop(xlen); 7741 pop(x); 7742 pop(z); 7743 7744 movl(tmp3, xlen); 7745 addl(tmp3, 1); 7746 movl(Address(z, tmp3, Address::times_4, 0), carry); 7747 subl(tmp3, 1); 7748 jccb(Assembler::negative, L_done); 7749 7750 shrq(carry, 32); 7751 movl(Address(z, tmp3, Address::times_4, 0), carry); 7752 jmp(L_second_loop); 7753 7754 // Next infrequent code is moved outside loops. 7755 bind(L_last_x); 7756 if (UseBMI2Instructions) { 7757 movl(rdx, Address(x, 0)); 7758 } else { 7759 movl(x_xstart, Address(x, 0)); 7760 } 7761 jmp(L_third_loop_prologue); 7762 7763 bind(L_done); 7764 7765 pop(zlen); 7766 pop(xlen); 7767 7768 pop(tmp5); 7769 pop(tmp4); 7770 pop(tmp3); 7771 pop(tmp2); 7772 pop(tmp1); 7773 } 7774 7775 //Helper functions for square_to_len() 7776 7777 /** 7778 * Store the squares of x[], right shifted one bit (divided by 2) into z[] 7779 * Preserves x and z and modifies rest of the registers. 7780 */ 7781 7782 void MacroAssembler::square_rshift(Register x, Register xlen, Register z, Register tmp1, Register tmp3, Register tmp4, Register tmp5, Register rdxReg, Register raxReg) { 7783 // Perform square and right shift by 1 7784 // Handle odd xlen case first, then for even xlen do the following 7785 // jlong carry = 0; 7786 // for (int j=0, i=0; j < xlen; j+=2, i+=4) { 7787 // huge_128 product = x[j:j+1] * x[j:j+1]; 7788 // z[i:i+1] = (carry << 63) | (jlong)(product >>> 65); 7789 // z[i+2:i+3] = (jlong)(product >>> 1); 7790 // carry = (jlong)product; 7791 // } 7792 7793 xorq(tmp5, tmp5); // carry 7794 xorq(rdxReg, rdxReg); 7795 xorl(tmp1, tmp1); // index for x 7796 xorl(tmp4, tmp4); // index for z 7797 7798 Label L_first_loop, L_first_loop_exit; 7799 7800 testl(xlen, 1); 7801 jccb(Assembler::zero, L_first_loop); //jump if xlen is even 7802 7803 // Square and right shift by 1 the odd element using 32 bit multiply 7804 movl(raxReg, Address(x, tmp1, Address::times_4, 0)); 7805 imulq(raxReg, raxReg); 7806 shrq(raxReg, 1); 7807 adcq(tmp5, 0); 7808 movq(Address(z, tmp4, Address::times_4, 0), raxReg); 7809 incrementl(tmp1); 7810 addl(tmp4, 2); 7811 7812 // Square and right shift by 1 the rest using 64 bit multiply 7813 bind(L_first_loop); 7814 cmpptr(tmp1, xlen); 7815 jccb(Assembler::equal, L_first_loop_exit); 7816 7817 // Square 7818 movq(raxReg, Address(x, tmp1, Address::times_4, 0)); 7819 rorq(raxReg, 32); // convert big-endian to little-endian 7820 mulq(raxReg); // 64-bit multiply rax * rax -> rdx:rax 7821 7822 // Right shift by 1 and save carry 7823 shrq(tmp5, 1); // rdx:rax:tmp5 = (tmp5:rdx:rax) >>> 1 7824 rcrq(rdxReg, 1); 7825 rcrq(raxReg, 1); 7826 adcq(tmp5, 0); 7827 7828 // Store result in z 7829 movq(Address(z, tmp4, Address::times_4, 0), rdxReg); 7830 movq(Address(z, tmp4, Address::times_4, 8), raxReg); 7831 7832 // Update indices for x and z 7833 addl(tmp1, 2); 7834 addl(tmp4, 4); 7835 jmp(L_first_loop); 7836 7837 bind(L_first_loop_exit); 7838 } 7839 7840 7841 /** 7842 * Perform the following multiply add operation using BMI2 instructions 7843 * carry:sum = sum + op1*op2 + carry 7844 * op2 should be in rdx 7845 * op2 is preserved, all other registers are modified 7846 */ 7847 void MacroAssembler::multiply_add_64_bmi2(Register sum, Register op1, Register op2, Register carry, Register tmp2) { 7848 // assert op2 is rdx 7849 mulxq(tmp2, op1, op1); // op1 * op2 -> tmp2:op1 7850 addq(sum, carry); 7851 adcq(tmp2, 0); 7852 addq(sum, op1); 7853 adcq(tmp2, 0); 7854 movq(carry, tmp2); 7855 } 7856 7857 /** 7858 * Perform the following multiply add operation: 7859 * carry:sum = sum + op1*op2 + carry 7860 * Preserves op1, op2 and modifies rest of registers 7861 */ 7862 void MacroAssembler::multiply_add_64(Register sum, Register op1, Register op2, Register carry, Register rdxReg, Register raxReg) { 7863 // rdx:rax = op1 * op2 7864 movq(raxReg, op2); 7865 mulq(op1); 7866 7867 // rdx:rax = sum + carry + rdx:rax 7868 addq(sum, carry); 7869 adcq(rdxReg, 0); 7870 addq(sum, raxReg); 7871 adcq(rdxReg, 0); 7872 7873 // carry:sum = rdx:sum 7874 movq(carry, rdxReg); 7875 } 7876 7877 /** 7878 * Add 64 bit long carry into z[] with carry propogation. 7879 * Preserves z and carry register values and modifies rest of registers. 7880 * 7881 */ 7882 void MacroAssembler::add_one_64(Register z, Register zlen, Register carry, Register tmp1) { 7883 Label L_fourth_loop, L_fourth_loop_exit; 7884 7885 movl(tmp1, 1); 7886 subl(zlen, 2); 7887 addq(Address(z, zlen, Address::times_4, 0), carry); 7888 7889 bind(L_fourth_loop); 7890 jccb(Assembler::carryClear, L_fourth_loop_exit); 7891 subl(zlen, 2); 7892 jccb(Assembler::negative, L_fourth_loop_exit); 7893 addq(Address(z, zlen, Address::times_4, 0), tmp1); 7894 jmp(L_fourth_loop); 7895 bind(L_fourth_loop_exit); 7896 } 7897 7898 /** 7899 * Shift z[] left by 1 bit. 7900 * Preserves x, len, z and zlen registers and modifies rest of the registers. 7901 * 7902 */ 7903 void MacroAssembler::lshift_by_1(Register x, Register len, Register z, Register zlen, Register tmp1, Register tmp2, Register tmp3, Register tmp4) { 7904 7905 Label L_fifth_loop, L_fifth_loop_exit; 7906 7907 // Fifth loop 7908 // Perform primitiveLeftShift(z, zlen, 1) 7909 7910 const Register prev_carry = tmp1; 7911 const Register new_carry = tmp4; 7912 const Register value = tmp2; 7913 const Register zidx = tmp3; 7914 7915 // int zidx, carry; 7916 // long value; 7917 // carry = 0; 7918 // for (zidx = zlen-2; zidx >=0; zidx -= 2) { 7919 // (carry:value) = (z[i] << 1) | carry ; 7920 // z[i] = value; 7921 // } 7922 7923 movl(zidx, zlen); 7924 xorl(prev_carry, prev_carry); // clear carry flag and prev_carry register 7925 7926 bind(L_fifth_loop); 7927 decl(zidx); // Use decl to preserve carry flag 7928 decl(zidx); 7929 jccb(Assembler::negative, L_fifth_loop_exit); 7930 7931 if (UseBMI2Instructions) { 7932 movq(value, Address(z, zidx, Address::times_4, 0)); 7933 rclq(value, 1); 7934 rorxq(value, value, 32); 7935 movq(Address(z, zidx, Address::times_4, 0), value); // Store back in big endian form 7936 } 7937 else { 7938 // clear new_carry 7939 xorl(new_carry, new_carry); 7940 7941 // Shift z[i] by 1, or in previous carry and save new carry 7942 movq(value, Address(z, zidx, Address::times_4, 0)); 7943 shlq(value, 1); 7944 adcl(new_carry, 0); 7945 7946 orq(value, prev_carry); 7947 rorq(value, 0x20); 7948 movq(Address(z, zidx, Address::times_4, 0), value); // Store back in big endian form 7949 7950 // Set previous carry = new carry 7951 movl(prev_carry, new_carry); 7952 } 7953 jmp(L_fifth_loop); 7954 7955 bind(L_fifth_loop_exit); 7956 } 7957 7958 7959 /** 7960 * Code for BigInteger::squareToLen() intrinsic 7961 * 7962 * rdi: x 7963 * rsi: len 7964 * r8: z 7965 * rcx: zlen 7966 * r12: tmp1 7967 * r13: tmp2 7968 * r14: tmp3 7969 * r15: tmp4 7970 * rbx: tmp5 7971 * 7972 */ 7973 void MacroAssembler::square_to_len(Register x, Register len, Register z, Register zlen, Register tmp1, Register tmp2, Register tmp3, Register tmp4, Register tmp5, Register rdxReg, Register raxReg) { 7974 7975 Label L_second_loop, L_second_loop_exit, L_third_loop, L_third_loop_exit, fifth_loop, fifth_loop_exit, L_last_x, L_multiply; 7976 push(tmp1); 7977 push(tmp2); 7978 push(tmp3); 7979 push(tmp4); 7980 push(tmp5); 7981 7982 // First loop 7983 // Store the squares, right shifted one bit (i.e., divided by 2). 7984 square_rshift(x, len, z, tmp1, tmp3, tmp4, tmp5, rdxReg, raxReg); 7985 7986 // Add in off-diagonal sums. 7987 // 7988 // Second, third (nested) and fourth loops. 7989 // zlen +=2; 7990 // for (int xidx=len-2,zidx=zlen-4; xidx > 0; xidx-=2,zidx-=4) { 7991 // carry = 0; 7992 // long op2 = x[xidx:xidx+1]; 7993 // for (int j=xidx-2,k=zidx; j >= 0; j-=2) { 7994 // k -= 2; 7995 // long op1 = x[j:j+1]; 7996 // long sum = z[k:k+1]; 7997 // carry:sum = multiply_add_64(sum, op1, op2, carry, tmp_regs); 7998 // z[k:k+1] = sum; 7999 // } 8000 // add_one_64(z, k, carry, tmp_regs); 8001 // } 8002 8003 const Register carry = tmp5; 8004 const Register sum = tmp3; 8005 const Register op1 = tmp4; 8006 Register op2 = tmp2; 8007 8008 push(zlen); 8009 push(len); 8010 addl(zlen,2); 8011 bind(L_second_loop); 8012 xorq(carry, carry); 8013 subl(zlen, 4); 8014 subl(len, 2); 8015 push(zlen); 8016 push(len); 8017 cmpl(len, 0); 8018 jccb(Assembler::lessEqual, L_second_loop_exit); 8019 8020 // Multiply an array by one 64 bit long. 8021 if (UseBMI2Instructions) { 8022 op2 = rdxReg; 8023 movq(op2, Address(x, len, Address::times_4, 0)); 8024 rorxq(op2, op2, 32); 8025 } 8026 else { 8027 movq(op2, Address(x, len, Address::times_4, 0)); 8028 rorq(op2, 32); 8029 } 8030 8031 bind(L_third_loop); 8032 decrementl(len); 8033 jccb(Assembler::negative, L_third_loop_exit); 8034 decrementl(len); 8035 jccb(Assembler::negative, L_last_x); 8036 8037 movq(op1, Address(x, len, Address::times_4, 0)); 8038 rorq(op1, 32); 8039 8040 bind(L_multiply); 8041 subl(zlen, 2); 8042 movq(sum, Address(z, zlen, Address::times_4, 0)); 8043 8044 // Multiply 64 bit by 64 bit and add 64 bits lower half and upper 64 bits as carry. 8045 if (UseBMI2Instructions) { 8046 multiply_add_64_bmi2(sum, op1, op2, carry, tmp2); 8047 } 8048 else { 8049 multiply_add_64(sum, op1, op2, carry, rdxReg, raxReg); 8050 } 8051 8052 movq(Address(z, zlen, Address::times_4, 0), sum); 8053 8054 jmp(L_third_loop); 8055 bind(L_third_loop_exit); 8056 8057 // Fourth loop 8058 // Add 64 bit long carry into z with carry propogation. 8059 // Uses offsetted zlen. 8060 add_one_64(z, zlen, carry, tmp1); 8061 8062 pop(len); 8063 pop(zlen); 8064 jmp(L_second_loop); 8065 8066 // Next infrequent code is moved outside loops. 8067 bind(L_last_x); 8068 movl(op1, Address(x, 0)); 8069 jmp(L_multiply); 8070 8071 bind(L_second_loop_exit); 8072 pop(len); 8073 pop(zlen); 8074 pop(len); 8075 pop(zlen); 8076 8077 // Fifth loop 8078 // Shift z left 1 bit. 8079 lshift_by_1(x, len, z, zlen, tmp1, tmp2, tmp3, tmp4); 8080 8081 // z[zlen-1] |= x[len-1] & 1; 8082 movl(tmp3, Address(x, len, Address::times_4, -4)); 8083 andl(tmp3, 1); 8084 orl(Address(z, zlen, Address::times_4, -4), tmp3); 8085 8086 pop(tmp5); 8087 pop(tmp4); 8088 pop(tmp3); 8089 pop(tmp2); 8090 pop(tmp1); 8091 } 8092 8093 /** 8094 * Helper function for mul_add() 8095 * Multiply the in[] by int k and add to out[] starting at offset offs using 8096 * 128 bit by 32 bit multiply and return the carry in tmp5. 8097 * Only quad int aligned length of in[] is operated on in this function. 8098 * k is in rdxReg for BMI2Instructions, for others it is in tmp2. 8099 * This function preserves out, in and k registers. 8100 * len and offset point to the appropriate index in "in" & "out" correspondingly 8101 * tmp5 has the carry. 8102 * other registers are temporary and are modified. 8103 * 8104 */ 8105 void MacroAssembler::mul_add_128_x_32_loop(Register out, Register in, 8106 Register offset, Register len, Register tmp1, Register tmp2, Register tmp3, 8107 Register tmp4, Register tmp5, Register rdxReg, Register raxReg) { 8108 8109 Label L_first_loop, L_first_loop_exit; 8110 8111 movl(tmp1, len); 8112 shrl(tmp1, 2); 8113 8114 bind(L_first_loop); 8115 subl(tmp1, 1); 8116 jccb(Assembler::negative, L_first_loop_exit); 8117 8118 subl(len, 4); 8119 subl(offset, 4); 8120 8121 Register op2 = tmp2; 8122 const Register sum = tmp3; 8123 const Register op1 = tmp4; 8124 const Register carry = tmp5; 8125 8126 if (UseBMI2Instructions) { 8127 op2 = rdxReg; 8128 } 8129 8130 movq(op1, Address(in, len, Address::times_4, 8)); 8131 rorq(op1, 32); 8132 movq(sum, Address(out, offset, Address::times_4, 8)); 8133 rorq(sum, 32); 8134 if (UseBMI2Instructions) { 8135 multiply_add_64_bmi2(sum, op1, op2, carry, raxReg); 8136 } 8137 else { 8138 multiply_add_64(sum, op1, op2, carry, rdxReg, raxReg); 8139 } 8140 // Store back in big endian from little endian 8141 rorq(sum, 0x20); 8142 movq(Address(out, offset, Address::times_4, 8), sum); 8143 8144 movq(op1, Address(in, len, Address::times_4, 0)); 8145 rorq(op1, 32); 8146 movq(sum, Address(out, offset, Address::times_4, 0)); 8147 rorq(sum, 32); 8148 if (UseBMI2Instructions) { 8149 multiply_add_64_bmi2(sum, op1, op2, carry, raxReg); 8150 } 8151 else { 8152 multiply_add_64(sum, op1, op2, carry, rdxReg, raxReg); 8153 } 8154 // Store back in big endian from little endian 8155 rorq(sum, 0x20); 8156 movq(Address(out, offset, Address::times_4, 0), sum); 8157 8158 jmp(L_first_loop); 8159 bind(L_first_loop_exit); 8160 } 8161 8162 /** 8163 * Code for BigInteger::mulAdd() intrinsic 8164 * 8165 * rdi: out 8166 * rsi: in 8167 * r11: offs (out.length - offset) 8168 * rcx: len 8169 * r8: k 8170 * r12: tmp1 8171 * r13: tmp2 8172 * r14: tmp3 8173 * r15: tmp4 8174 * rbx: tmp5 8175 * Multiply the in[] by word k and add to out[], return the carry in rax 8176 */ 8177 void MacroAssembler::mul_add(Register out, Register in, Register offs, 8178 Register len, Register k, Register tmp1, Register tmp2, Register tmp3, 8179 Register tmp4, Register tmp5, Register rdxReg, Register raxReg) { 8180 8181 Label L_carry, L_last_in, L_done; 8182 8183 // carry = 0; 8184 // for (int j=len-1; j >= 0; j--) { 8185 // long product = (in[j] & LONG_MASK) * kLong + 8186 // (out[offs] & LONG_MASK) + carry; 8187 // out[offs--] = (int)product; 8188 // carry = product >>> 32; 8189 // } 8190 // 8191 push(tmp1); 8192 push(tmp2); 8193 push(tmp3); 8194 push(tmp4); 8195 push(tmp5); 8196 8197 Register op2 = tmp2; 8198 const Register sum = tmp3; 8199 const Register op1 = tmp4; 8200 const Register carry = tmp5; 8201 8202 if (UseBMI2Instructions) { 8203 op2 = rdxReg; 8204 movl(op2, k); 8205 } 8206 else { 8207 movl(op2, k); 8208 } 8209 8210 xorq(carry, carry); 8211 8212 //First loop 8213 8214 //Multiply in[] by k in a 4 way unrolled loop using 128 bit by 32 bit multiply 8215 //The carry is in tmp5 8216 mul_add_128_x_32_loop(out, in, offs, len, tmp1, tmp2, tmp3, tmp4, tmp5, rdxReg, raxReg); 8217 8218 //Multiply the trailing in[] entry using 64 bit by 32 bit, if any 8219 decrementl(len); 8220 jccb(Assembler::negative, L_carry); 8221 decrementl(len); 8222 jccb(Assembler::negative, L_last_in); 8223 8224 movq(op1, Address(in, len, Address::times_4, 0)); 8225 rorq(op1, 32); 8226 8227 subl(offs, 2); 8228 movq(sum, Address(out, offs, Address::times_4, 0)); 8229 rorq(sum, 32); 8230 8231 if (UseBMI2Instructions) { 8232 multiply_add_64_bmi2(sum, op1, op2, carry, raxReg); 8233 } 8234 else { 8235 multiply_add_64(sum, op1, op2, carry, rdxReg, raxReg); 8236 } 8237 8238 // Store back in big endian from little endian 8239 rorq(sum, 0x20); 8240 movq(Address(out, offs, Address::times_4, 0), sum); 8241 8242 testl(len, len); 8243 jccb(Assembler::zero, L_carry); 8244 8245 //Multiply the last in[] entry, if any 8246 bind(L_last_in); 8247 movl(op1, Address(in, 0)); 8248 movl(sum, Address(out, offs, Address::times_4, -4)); 8249 8250 movl(raxReg, k); 8251 mull(op1); //tmp4 * eax -> edx:eax 8252 addl(sum, carry); 8253 adcl(rdxReg, 0); 8254 addl(sum, raxReg); 8255 adcl(rdxReg, 0); 8256 movl(carry, rdxReg); 8257 8258 movl(Address(out, offs, Address::times_4, -4), sum); 8259 8260 bind(L_carry); 8261 //return tmp5/carry as carry in rax 8262 movl(rax, carry); 8263 8264 bind(L_done); 8265 pop(tmp5); 8266 pop(tmp4); 8267 pop(tmp3); 8268 pop(tmp2); 8269 pop(tmp1); 8270 } 8271 #endif 8272 8273 /** 8274 * Emits code to update CRC-32 with a byte value according to constants in table 8275 * 8276 * @param [in,out]crc Register containing the crc. 8277 * @param [in]val Register containing the byte to fold into the CRC. 8278 * @param [in]table Register containing the table of crc constants. 8279 * 8280 * uint32_t crc; 8281 * val = crc_table[(val ^ crc) & 0xFF]; 8282 * crc = val ^ (crc >> 8); 8283 * 8284 */ 8285 void MacroAssembler::update_byte_crc32(Register crc, Register val, Register table) { 8286 xorl(val, crc); 8287 andl(val, 0xFF); 8288 shrl(crc, 8); // unsigned shift 8289 xorl(crc, Address(table, val, Address::times_4, 0)); 8290 } 8291 8292 /** 8293 * Fold 128-bit data chunk 8294 */ 8295 void MacroAssembler::fold_128bit_crc32(XMMRegister xcrc, XMMRegister xK, XMMRegister xtmp, Register buf, int offset) { 8296 if (UseAVX > 0) { 8297 vpclmulhdq(xtmp, xK, xcrc); // [123:64] 8298 vpclmulldq(xcrc, xK, xcrc); // [63:0] 8299 vpxor(xcrc, xcrc, Address(buf, offset), 0 /* vector_len */); 8300 pxor(xcrc, xtmp); 8301 } else { 8302 movdqa(xtmp, xcrc); 8303 pclmulhdq(xtmp, xK); // [123:64] 8304 pclmulldq(xcrc, xK); // [63:0] 8305 pxor(xcrc, xtmp); 8306 movdqu(xtmp, Address(buf, offset)); 8307 pxor(xcrc, xtmp); 8308 } 8309 } 8310 8311 void MacroAssembler::fold_128bit_crc32(XMMRegister xcrc, XMMRegister xK, XMMRegister xtmp, XMMRegister xbuf) { 8312 if (UseAVX > 0) { 8313 vpclmulhdq(xtmp, xK, xcrc); 8314 vpclmulldq(xcrc, xK, xcrc); 8315 pxor(xcrc, xbuf); 8316 pxor(xcrc, xtmp); 8317 } else { 8318 movdqa(xtmp, xcrc); 8319 pclmulhdq(xtmp, xK); 8320 pclmulldq(xcrc, xK); 8321 pxor(xcrc, xbuf); 8322 pxor(xcrc, xtmp); 8323 } 8324 } 8325 8326 /** 8327 * 8-bit folds to compute 32-bit CRC 8328 * 8329 * uint64_t xcrc; 8330 * timesXtoThe32[xcrc & 0xFF] ^ (xcrc >> 8); 8331 */ 8332 void MacroAssembler::fold_8bit_crc32(XMMRegister xcrc, Register table, XMMRegister xtmp, Register tmp) { 8333 movdl(tmp, xcrc); 8334 andl(tmp, 0xFF); 8335 movdl(xtmp, Address(table, tmp, Address::times_4, 0)); 8336 psrldq(xcrc, 1); // unsigned shift one byte 8337 pxor(xcrc, xtmp); 8338 } 8339 8340 /** 8341 * uint32_t crc; 8342 * timesXtoThe32[crc & 0xFF] ^ (crc >> 8); 8343 */ 8344 void MacroAssembler::fold_8bit_crc32(Register crc, Register table, Register tmp) { 8345 movl(tmp, crc); 8346 andl(tmp, 0xFF); 8347 shrl(crc, 8); 8348 xorl(crc, Address(table, tmp, Address::times_4, 0)); 8349 } 8350 8351 /** 8352 * @param crc register containing existing CRC (32-bit) 8353 * @param buf register pointing to input byte buffer (byte*) 8354 * @param len register containing number of bytes 8355 * @param table register that will contain address of CRC table 8356 * @param tmp scratch register 8357 */ 8358 void MacroAssembler::kernel_crc32(Register crc, Register buf, Register len, Register table, Register tmp) { 8359 assert_different_registers(crc, buf, len, table, tmp, rax); 8360 8361 Label L_tail, L_tail_restore, L_tail_loop, L_exit, L_align_loop, L_aligned; 8362 Label L_fold_tail, L_fold_128b, L_fold_512b, L_fold_512b_loop, L_fold_tail_loop; 8363 8364 lea(table, ExternalAddress(StubRoutines::crc_table_addr())); 8365 notl(crc); // ~crc 8366 cmpl(len, 16); 8367 jcc(Assembler::less, L_tail); 8368 8369 // Align buffer to 16 bytes 8370 movl(tmp, buf); 8371 andl(tmp, 0xF); 8372 jccb(Assembler::zero, L_aligned); 8373 subl(tmp, 16); 8374 addl(len, tmp); 8375 8376 align(4); 8377 BIND(L_align_loop); 8378 movsbl(rax, Address(buf, 0)); // load byte with sign extension 8379 update_byte_crc32(crc, rax, table); 8380 increment(buf); 8381 incrementl(tmp); 8382 jccb(Assembler::less, L_align_loop); 8383 8384 BIND(L_aligned); 8385 movl(tmp, len); // save 8386 shrl(len, 4); 8387 jcc(Assembler::zero, L_tail_restore); 8388 8389 // Fold crc into first bytes of vector 8390 movdqa(xmm1, Address(buf, 0)); 8391 movdl(rax, xmm1); 8392 xorl(crc, rax); 8393 pinsrd(xmm1, crc, 0); 8394 addptr(buf, 16); 8395 subl(len, 4); // len > 0 8396 jcc(Assembler::less, L_fold_tail); 8397 8398 movdqa(xmm2, Address(buf, 0)); 8399 movdqa(xmm3, Address(buf, 16)); 8400 movdqa(xmm4, Address(buf, 32)); 8401 addptr(buf, 48); 8402 subl(len, 3); 8403 jcc(Assembler::lessEqual, L_fold_512b); 8404 8405 // Fold total 512 bits of polynomial on each iteration, 8406 // 128 bits per each of 4 parallel streams. 8407 movdqu(xmm0, ExternalAddress(StubRoutines::x86::crc_by128_masks_addr() + 32)); 8408 8409 align(32); 8410 BIND(L_fold_512b_loop); 8411 fold_128bit_crc32(xmm1, xmm0, xmm5, buf, 0); 8412 fold_128bit_crc32(xmm2, xmm0, xmm5, buf, 16); 8413 fold_128bit_crc32(xmm3, xmm0, xmm5, buf, 32); 8414 fold_128bit_crc32(xmm4, xmm0, xmm5, buf, 48); 8415 addptr(buf, 64); 8416 subl(len, 4); 8417 jcc(Assembler::greater, L_fold_512b_loop); 8418 8419 // Fold 512 bits to 128 bits. 8420 BIND(L_fold_512b); 8421 movdqu(xmm0, ExternalAddress(StubRoutines::x86::crc_by128_masks_addr() + 16)); 8422 fold_128bit_crc32(xmm1, xmm0, xmm5, xmm2); 8423 fold_128bit_crc32(xmm1, xmm0, xmm5, xmm3); 8424 fold_128bit_crc32(xmm1, xmm0, xmm5, xmm4); 8425 8426 // Fold the rest of 128 bits data chunks 8427 BIND(L_fold_tail); 8428 addl(len, 3); 8429 jccb(Assembler::lessEqual, L_fold_128b); 8430 movdqu(xmm0, ExternalAddress(StubRoutines::x86::crc_by128_masks_addr() + 16)); 8431 8432 BIND(L_fold_tail_loop); 8433 fold_128bit_crc32(xmm1, xmm0, xmm5, buf, 0); 8434 addptr(buf, 16); 8435 decrementl(len); 8436 jccb(Assembler::greater, L_fold_tail_loop); 8437 8438 // Fold 128 bits in xmm1 down into 32 bits in crc register. 8439 BIND(L_fold_128b); 8440 movdqu(xmm0, ExternalAddress(StubRoutines::x86::crc_by128_masks_addr())); 8441 if (UseAVX > 0) { 8442 vpclmulqdq(xmm2, xmm0, xmm1, 0x1); 8443 vpand(xmm3, xmm0, xmm2, 0 /* vector_len */); 8444 vpclmulqdq(xmm0, xmm0, xmm3, 0x1); 8445 } else { 8446 movdqa(xmm2, xmm0); 8447 pclmulqdq(xmm2, xmm1, 0x1); 8448 movdqa(xmm3, xmm0); 8449 pand(xmm3, xmm2); 8450 pclmulqdq(xmm0, xmm3, 0x1); 8451 } 8452 psrldq(xmm1, 8); 8453 psrldq(xmm2, 4); 8454 pxor(xmm0, xmm1); 8455 pxor(xmm0, xmm2); 8456 8457 // 8 8-bit folds to compute 32-bit CRC. 8458 for (int j = 0; j < 4; j++) { 8459 fold_8bit_crc32(xmm0, table, xmm1, rax); 8460 } 8461 movdl(crc, xmm0); // mov 32 bits to general register 8462 for (int j = 0; j < 4; j++) { 8463 fold_8bit_crc32(crc, table, rax); 8464 } 8465 8466 BIND(L_tail_restore); 8467 movl(len, tmp); // restore 8468 BIND(L_tail); 8469 andl(len, 0xf); 8470 jccb(Assembler::zero, L_exit); 8471 8472 // Fold the rest of bytes 8473 align(4); 8474 BIND(L_tail_loop); 8475 movsbl(rax, Address(buf, 0)); // load byte with sign extension 8476 update_byte_crc32(crc, rax, table); 8477 increment(buf); 8478 decrementl(len); 8479 jccb(Assembler::greater, L_tail_loop); 8480 8481 BIND(L_exit); 8482 notl(crc); // ~c 8483 } 8484 8485 #undef BIND 8486 #undef BLOCK_COMMENT 8487 8488 8489 Assembler::Condition MacroAssembler::negate_condition(Assembler::Condition cond) { 8490 switch (cond) { 8491 // Note some conditions are synonyms for others 8492 case Assembler::zero: return Assembler::notZero; 8493 case Assembler::notZero: return Assembler::zero; 8494 case Assembler::less: return Assembler::greaterEqual; 8495 case Assembler::lessEqual: return Assembler::greater; 8496 case Assembler::greater: return Assembler::lessEqual; 8497 case Assembler::greaterEqual: return Assembler::less; 8498 case Assembler::below: return Assembler::aboveEqual; 8499 case Assembler::belowEqual: return Assembler::above; 8500 case Assembler::above: return Assembler::belowEqual; 8501 case Assembler::aboveEqual: return Assembler::below; 8502 case Assembler::overflow: return Assembler::noOverflow; 8503 case Assembler::noOverflow: return Assembler::overflow; 8504 case Assembler::negative: return Assembler::positive; 8505 case Assembler::positive: return Assembler::negative; 8506 case Assembler::parity: return Assembler::noParity; 8507 case Assembler::noParity: return Assembler::parity; 8508 } 8509 ShouldNotReachHere(); return Assembler::overflow; 8510 } 8511 8512 SkipIfEqual::SkipIfEqual( 8513 MacroAssembler* masm, const bool* flag_addr, bool value) { 8514 _masm = masm; 8515 _masm->cmp8(ExternalAddress((address)flag_addr), value); 8516 _masm->jcc(Assembler::equal, _label); 8517 } 8518 8519 SkipIfEqual::~SkipIfEqual() { 8520 _masm->bind(_label); 8521 }