1 /*
2 * Copyright (c) 2005, 2016, 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 "c1/c1_Compilation.hpp"
27 #include "c1/c1_FrameMap.hpp"
28 #include "c1/c1_Instruction.hpp"
29 #include "c1/c1_LIRAssembler.hpp"
30 #include "c1/c1_LIRGenerator.hpp"
31 #include "c1/c1_Runtime1.hpp"
32 #include "c1/c1_ValueStack.hpp"
33 #include "ci/ciArray.hpp"
34 #include "ci/ciObjArrayKlass.hpp"
35 #include "ci/ciTypeArrayKlass.hpp"
36 #include "runtime/sharedRuntime.hpp"
37 #include "runtime/stubRoutines.hpp"
38 #include "vmreg_sparc.inline.hpp"
39
40 #ifdef ASSERT
41 #define __ gen()->lir(__FILE__, __LINE__)->
42 #else
43 #define __ gen()->lir()->
44 #endif
45
46 void LIRItem::load_byte_item() {
47 // byte loads use same registers as other loads
48 load_item();
49 }
50
51
52 void LIRItem::load_nonconstant() {
53 LIR_Opr r = value()->operand();
54 if (_gen->can_inline_as_constant(value())) {
55 if (!r->is_constant()) {
56 r = LIR_OprFact::value_type(value()->type());
57 }
58 _result = r;
59 } else {
60 load_item();
61 }
62 }
63
64
65 //--------------------------------------------------------------
66 // LIRGenerator
67 //--------------------------------------------------------------
68
69 LIR_Opr LIRGenerator::exceptionOopOpr() { return FrameMap::Oexception_opr; }
70 LIR_Opr LIRGenerator::exceptionPcOpr() { return FrameMap::Oissuing_pc_opr; }
71 LIR_Opr LIRGenerator::syncTempOpr() { return new_register(T_OBJECT); }
72 LIR_Opr LIRGenerator::getThreadTemp() { return rlock_callee_saved(T_INT); }
73
74 LIR_Opr LIRGenerator::result_register_for(ValueType* type, bool callee) {
75 LIR_Opr opr;
76 switch (type->tag()) {
77 case intTag: opr = callee ? FrameMap::I0_opr : FrameMap::O0_opr; break;
78 case objectTag: opr = callee ? FrameMap::I0_oop_opr : FrameMap::O0_oop_opr; break;
79 case longTag: opr = callee ? FrameMap::in_long_opr : FrameMap::out_long_opr; break;
80 case floatTag: opr = FrameMap::F0_opr; break;
81 case doubleTag: opr = FrameMap::F0_double_opr; break;
82
83 case addressTag:
84 default: ShouldNotReachHere(); return LIR_OprFact::illegalOpr;
85 }
86
87 assert(opr->type_field() == as_OprType(as_BasicType(type)), "type mismatch");
88 return opr;
89 }
90
91 LIR_Opr LIRGenerator::rlock_callee_saved(BasicType type) {
92 LIR_Opr reg = new_register(type);
93 set_vreg_flag(reg, callee_saved);
94 return reg;
95 }
96
97
98 LIR_Opr LIRGenerator::rlock_byte(BasicType type) {
99 return new_register(T_INT);
100 }
101
102
103
104
105
106 //--------- loading items into registers --------------------------------
107
108 // SPARC cannot inline all constants
109 bool LIRGenerator::can_store_as_constant(Value v, BasicType type) const {
110 if (v->type()->as_IntConstant() != NULL) {
111 return v->type()->as_IntConstant()->value() == 0;
112 } else if (v->type()->as_LongConstant() != NULL) {
113 return v->type()->as_LongConstant()->value() == 0L;
114 } else if (v->type()->as_ObjectConstant() != NULL) {
115 return v->type()->as_ObjectConstant()->value()->is_null_object();
116 } else {
117 return false;
118 }
119 }
120
121
122 // only simm13 constants can be inlined
123 bool LIRGenerator:: can_inline_as_constant(Value i) const {
124 if (i->type()->as_IntConstant() != NULL) {
125 return Assembler::is_simm13(i->type()->as_IntConstant()->value());
126 } else {
127 return can_store_as_constant(i, as_BasicType(i->type()));
128 }
129 }
130
131
132 bool LIRGenerator:: can_inline_as_constant(LIR_Const* c) const {
133 if (c->type() == T_INT) {
134 return Assembler::is_simm13(c->as_jint());
135 }
136 return false;
137 }
138
139
140 LIR_Opr LIRGenerator::safepoint_poll_register() {
141 return new_register(T_INT);
142 }
143
144
145
146 LIR_Address* LIRGenerator::generate_address(LIR_Opr base, LIR_Opr index,
147 int shift, int disp, BasicType type) {
148 assert(base->is_register(), "must be");
149
150 // accumulate fixed displacements
151 if (index->is_constant()) {
152 disp += index->as_constant_ptr()->as_jint() << shift;
153 index = LIR_OprFact::illegalOpr;
154 }
155
156 if (index->is_register()) {
157 // apply the shift and accumulate the displacement
158 if (shift > 0) {
159 LIR_Opr tmp = new_pointer_register();
160 __ shift_left(index, shift, tmp);
161 index = tmp;
162 }
163 if (disp != 0) {
164 LIR_Opr tmp = new_pointer_register();
165 if (Assembler::is_simm13(disp)) {
166 __ add(tmp, LIR_OprFact::intptrConst(disp), tmp);
167 index = tmp;
168 } else {
169 __ move(LIR_OprFact::intptrConst(disp), tmp);
170 __ add(tmp, index, tmp);
171 index = tmp;
172 }
173 disp = 0;
174 }
175 } else if (disp != 0 && !Assembler::is_simm13(disp)) {
176 // index is illegal so replace it with the displacement loaded into a register
177 index = new_pointer_register();
178 __ move(LIR_OprFact::intptrConst(disp), index);
179 disp = 0;
180 }
181
182 // at this point we either have base + index or base + displacement
183 if (disp == 0) {
184 return new LIR_Address(base, index, type);
185 } else {
186 assert(Assembler::is_simm13(disp), "must be");
187 return new LIR_Address(base, disp, type);
188 }
189 }
190
191
192 LIR_Address* LIRGenerator::emit_array_address(LIR_Opr array_opr, LIR_Opr index_opr,
193 BasicType type, bool needs_card_mark) {
194 int elem_size = type2aelembytes(type);
195 int shift = exact_log2(elem_size);
196
197 LIR_Opr base_opr;
198 int offset = arrayOopDesc::base_offset_in_bytes(type);
199
200 if (index_opr->is_constant()) {
201 int i = index_opr->as_constant_ptr()->as_jint();
202 int array_offset = i * elem_size;
203 if (Assembler::is_simm13(array_offset + offset)) {
204 base_opr = array_opr;
205 offset = array_offset + offset;
206 } else {
207 base_opr = new_pointer_register();
208 if (Assembler::is_simm13(array_offset)) {
209 __ add(array_opr, LIR_OprFact::intptrConst(array_offset), base_opr);
210 } else {
211 __ move(LIR_OprFact::intptrConst(array_offset), base_opr);
212 __ add(base_opr, array_opr, base_opr);
213 }
214 }
215 } else {
216 #ifdef _LP64
217 if (index_opr->type() == T_INT) {
218 LIR_Opr tmp = new_register(T_LONG);
219 __ convert(Bytecodes::_i2l, index_opr, tmp);
220 index_opr = tmp;
221 }
222 #endif
223
224 base_opr = new_pointer_register();
225 assert (index_opr->is_register(), "Must be register");
226 if (shift > 0) {
227 __ shift_left(index_opr, shift, base_opr);
228 __ add(base_opr, array_opr, base_opr);
229 } else {
230 __ add(index_opr, array_opr, base_opr);
231 }
232 }
233 if (needs_card_mark) {
234 LIR_Opr ptr = new_pointer_register();
235 __ add(base_opr, LIR_OprFact::intptrConst(offset), ptr);
236 return new LIR_Address(ptr, type);
237 } else {
238 return new LIR_Address(base_opr, offset, type);
239 }
240 }
241
242 LIR_Opr LIRGenerator::load_immediate(int x, BasicType type) {
243 LIR_Opr r;
244 if (type == T_LONG) {
245 r = LIR_OprFact::longConst(x);
246 } else if (type == T_INT) {
247 r = LIR_OprFact::intConst(x);
248 } else {
249 ShouldNotReachHere();
250 }
251 if (!Assembler::is_simm13(x)) {
252 LIR_Opr tmp = new_register(type);
253 __ move(r, tmp);
254 return tmp;
255 }
256 return r;
257 }
258
259 void LIRGenerator::increment_counter(address counter, BasicType type, int step) {
260 LIR_Opr pointer = new_pointer_register();
261 __ move(LIR_OprFact::intptrConst(counter), pointer);
262 LIR_Address* addr = new LIR_Address(pointer, type);
263 increment_counter(addr, step);
264 }
265
266 void LIRGenerator::increment_counter(LIR_Address* addr, int step) {
267 LIR_Opr temp = new_register(addr->type());
268 __ move(addr, temp);
269 __ add(temp, load_immediate(step, addr->type()), temp);
270 __ move(temp, addr);
271 }
272
273 void LIRGenerator::cmp_mem_int(LIR_Condition condition, LIR_Opr base, int disp, int c, CodeEmitInfo* info) {
274 LIR_Opr o7opr = FrameMap::O7_opr;
275 __ load(new LIR_Address(base, disp, T_INT), o7opr, info);
276 __ cmp(condition, o7opr, c);
277 }
278
279
280 void LIRGenerator::cmp_reg_mem(LIR_Condition condition, LIR_Opr reg, LIR_Opr base, int disp, BasicType type, CodeEmitInfo* info) {
281 LIR_Opr o7opr = FrameMap::O7_opr;
282 __ load(new LIR_Address(base, disp, type), o7opr, info);
283 __ cmp(condition, reg, o7opr);
284 }
285
286
287 void LIRGenerator::cmp_reg_mem(LIR_Condition condition, LIR_Opr reg, LIR_Opr base, LIR_Opr disp, BasicType type, CodeEmitInfo* info) {
288 LIR_Opr o7opr = FrameMap::O7_opr;
289 __ load(new LIR_Address(base, disp, type), o7opr, info);
290 __ cmp(condition, reg, o7opr);
291 }
292
293
294 bool LIRGenerator::strength_reduce_multiply(LIR_Opr left, int c, LIR_Opr result, LIR_Opr tmp) {
295 assert(left != result, "should be different registers");
296 if (is_power_of_2(c + 1)) {
297 __ shift_left(left, log2_int(c + 1), result);
298 __ sub(result, left, result);
299 return true;
300 } else if (is_power_of_2(c - 1)) {
301 __ shift_left(left, log2_int(c - 1), result);
302 __ add(result, left, result);
303 return true;
304 }
305 return false;
306 }
307
308
309 void LIRGenerator::store_stack_parameter (LIR_Opr item, ByteSize offset_from_sp) {
310 BasicType t = item->type();
311 LIR_Opr sp_opr = FrameMap::SP_opr;
312 if ((t == T_LONG || t == T_DOUBLE) &&
313 ((in_bytes(offset_from_sp) - STACK_BIAS) % 8 != 0)) {
314 __ unaligned_move(item, new LIR_Address(sp_opr, in_bytes(offset_from_sp), t));
315 } else {
316 __ move(item, new LIR_Address(sp_opr, in_bytes(offset_from_sp), t));
317 }
318 }
319
320 //----------------------------------------------------------------------
321 // visitor functions
322 //----------------------------------------------------------------------
323
324
325 void LIRGenerator::do_StoreIndexed(StoreIndexed* x) {
326 assert(x->is_pinned(),"");
327 bool needs_range_check = x->compute_needs_range_check();
328 bool use_length = x->length() != NULL;
329 bool obj_store = x->elt_type() == T_ARRAY || x->elt_type() == T_OBJECT;
330 bool needs_store_check = obj_store && (x->value()->as_Constant() == NULL ||
331 !get_jobject_constant(x->value())->is_null_object() ||
332 x->should_profile());
333
334 LIRItem array(x->array(), this);
335 LIRItem index(x->index(), this);
336 LIRItem value(x->value(), this);
337 LIRItem length(this);
338
339 array.load_item();
340 index.load_nonconstant();
341
342 if (use_length && needs_range_check) {
343 length.set_instruction(x->length());
344 length.load_item();
345 }
346 if (needs_store_check || x->check_boolean()) {
347 value.load_item();
348 } else {
349 value.load_for_store(x->elt_type());
350 }
351
352 set_no_result(x);
353
354 // the CodeEmitInfo must be duplicated for each different
355 // LIR-instruction because spilling can occur anywhere between two
356 // instructions and so the debug information must be different
357 CodeEmitInfo* range_check_info = state_for(x);
358 CodeEmitInfo* null_check_info = NULL;
359 if (x->needs_null_check()) {
360 null_check_info = new CodeEmitInfo(range_check_info);
361 }
362
363 // emit array address setup early so it schedules better
364 LIR_Address* array_addr = emit_array_address(array.result(), index.result(), x->elt_type(), obj_store);
365
366 if (GenerateRangeChecks && needs_range_check) {
367 if (use_length) {
368 __ cmp(lir_cond_belowEqual, length.result(), index.result());
369 __ branch(lir_cond_belowEqual, T_INT, new RangeCheckStub(range_check_info, index.result()));
370 } else {
371 array_range_check(array.result(), index.result(), null_check_info, range_check_info);
372 // range_check also does the null check
373 null_check_info = NULL;
374 }
375 }
376
377 if (GenerateArrayStoreCheck && needs_store_check) {
378 LIR_Opr tmp1 = FrameMap::G1_opr;
379 LIR_Opr tmp2 = FrameMap::G3_opr;
380 LIR_Opr tmp3 = FrameMap::G5_opr;
381
382 CodeEmitInfo* store_check_info = new CodeEmitInfo(range_check_info);
383 __ store_check(value.result(), array.result(), tmp1, tmp2, tmp3, store_check_info, x->profiled_method(), x->profiled_bci());
384 }
385
386 if (obj_store) {
387 // Needs GC write barriers.
388 pre_barrier(LIR_OprFact::address(array_addr), LIR_OprFact::illegalOpr /* pre_val */,
389 true /* do_load */, false /* patch */, NULL);
390 }
391 LIR_Opr result = maybe_mask_boolean(x, array.result(), value.result(), null_check_info);
392 __ move(result, array_addr, null_check_info);
393 if (obj_store) {
394 // Precise card mark
395 post_barrier(LIR_OprFact::address(array_addr), value.result());
396 }
397 }
398
399
400 void LIRGenerator::do_MonitorEnter(MonitorEnter* x) {
401 assert(x->is_pinned(),"");
402 LIRItem obj(x->obj(), this);
403 obj.load_item();
404
405 set_no_result(x);
406
407 LIR_Opr lock = FrameMap::G1_opr;
408 LIR_Opr scratch = FrameMap::G3_opr;
409 LIR_Opr hdr = FrameMap::G4_opr;
410
411 CodeEmitInfo* info_for_exception = NULL;
412 if (x->needs_null_check()) {
413 info_for_exception = state_for(x);
414 }
415
416 // this CodeEmitInfo must not have the xhandlers because here the
417 // object is already locked (xhandlers expects object to be unlocked)
418 CodeEmitInfo* info = state_for(x, x->state(), true);
419 monitor_enter(obj.result(), lock, hdr, scratch, x->monitor_no(), info_for_exception, info);
420 }
421
422
423 void LIRGenerator::do_MonitorExit(MonitorExit* x) {
424 assert(x->is_pinned(),"");
425 LIRItem obj(x->obj(), this);
426 obj.dont_load_item();
427
428 set_no_result(x);
429 LIR_Opr lock = FrameMap::G1_opr;
430 LIR_Opr hdr = FrameMap::G3_opr;
431 LIR_Opr obj_temp = FrameMap::G4_opr;
432 monitor_exit(obj_temp, lock, hdr, LIR_OprFact::illegalOpr, x->monitor_no());
433 }
434
435
436 // _ineg, _lneg, _fneg, _dneg
437 void LIRGenerator::do_NegateOp(NegateOp* x) {
438 LIRItem value(x->x(), this);
439 value.load_item();
440 LIR_Opr reg = rlock_result(x);
441 __ negate(value.result(), reg);
442 }
443
444
445
446 // for _fadd, _fmul, _fsub, _fdiv, _frem
447 // _dadd, _dmul, _dsub, _ddiv, _drem
448 void LIRGenerator::do_ArithmeticOp_FPU(ArithmeticOp* x) {
449 switch (x->op()) {
450 case Bytecodes::_fadd:
451 case Bytecodes::_fmul:
452 case Bytecodes::_fsub:
453 case Bytecodes::_fdiv:
454 case Bytecodes::_dadd:
455 case Bytecodes::_dmul:
456 case Bytecodes::_dsub:
457 case Bytecodes::_ddiv: {
458 LIRItem left(x->x(), this);
459 LIRItem right(x->y(), this);
460 left.load_item();
461 right.load_item();
462 rlock_result(x);
463 arithmetic_op_fpu(x->op(), x->operand(), left.result(), right.result(), x->is_strictfp());
464 }
465 break;
466
467 case Bytecodes::_frem:
468 case Bytecodes::_drem: {
469 address entry;
470 switch (x->op()) {
471 case Bytecodes::_frem:
472 entry = CAST_FROM_FN_PTR(address, SharedRuntime::frem);
473 break;
474 case Bytecodes::_drem:
475 entry = CAST_FROM_FN_PTR(address, SharedRuntime::drem);
476 break;
477 default:
478 ShouldNotReachHere();
479 }
480 LIR_Opr result = call_runtime(x->x(), x->y(), entry, x->type(), NULL);
481 set_result(x, result);
482 }
483 break;
484
485 default: ShouldNotReachHere();
486 }
487 }
488
489
490 // for _ladd, _lmul, _lsub, _ldiv, _lrem
491 void LIRGenerator::do_ArithmeticOp_Long(ArithmeticOp* x) {
492 switch (x->op()) {
493 case Bytecodes::_lrem:
494 case Bytecodes::_lmul:
495 case Bytecodes::_ldiv: {
496
497 if (x->op() == Bytecodes::_ldiv || x->op() == Bytecodes::_lrem) {
498 LIRItem right(x->y(), this);
499 right.load_item();
500
501 CodeEmitInfo* info = state_for(x);
502 LIR_Opr item = right.result();
503 assert(item->is_register(), "must be");
504 __ cmp(lir_cond_equal, item, LIR_OprFact::longConst(0));
505 __ branch(lir_cond_equal, T_LONG, new DivByZeroStub(info));
506 }
507
508 address entry;
509 switch (x->op()) {
510 case Bytecodes::_lrem:
511 entry = CAST_FROM_FN_PTR(address, SharedRuntime::lrem);
512 break; // check if dividend is 0 is done elsewhere
513 case Bytecodes::_ldiv:
514 entry = CAST_FROM_FN_PTR(address, SharedRuntime::ldiv);
515 break; // check if dividend is 0 is done elsewhere
516 case Bytecodes::_lmul:
517 entry = CAST_FROM_FN_PTR(address, SharedRuntime::lmul);
518 break;
519 default:
520 ShouldNotReachHere();
521 }
522
523 // order of arguments to runtime call is reversed.
524 LIR_Opr result = call_runtime(x->y(), x->x(), entry, x->type(), NULL);
525 set_result(x, result);
526 break;
527 }
528 case Bytecodes::_ladd:
529 case Bytecodes::_lsub: {
530 LIRItem left(x->x(), this);
531 LIRItem right(x->y(), this);
532 left.load_item();
533 right.load_item();
534 rlock_result(x);
535
536 arithmetic_op_long(x->op(), x->operand(), left.result(), right.result(), NULL);
537 break;
538 }
539 default: ShouldNotReachHere();
540 }
541 }
542
543
544 // Returns if item is an int constant that can be represented by a simm13
545 static bool is_simm13(LIR_Opr item) {
546 if (item->is_constant() && item->type() == T_INT) {
547 return Assembler::is_simm13(item->as_constant_ptr()->as_jint());
548 } else {
549 return false;
550 }
551 }
552
553
554 // for: _iadd, _imul, _isub, _idiv, _irem
555 void LIRGenerator::do_ArithmeticOp_Int(ArithmeticOp* x) {
556 bool is_div_rem = x->op() == Bytecodes::_idiv || x->op() == Bytecodes::_irem;
557 LIRItem left(x->x(), this);
558 LIRItem right(x->y(), this);
559 // missing test if instr is commutative and if we should swap
560 right.load_nonconstant();
561 assert(right.is_constant() || right.is_register(), "wrong state of right");
562 left.load_item();
563 rlock_result(x);
564 if (is_div_rem) {
565 CodeEmitInfo* info = state_for(x);
566 LIR_Opr tmp = FrameMap::G1_opr;
567 if (x->op() == Bytecodes::_irem) {
568 __ irem(left.result(), right.result(), x->operand(), tmp, info);
569 } else if (x->op() == Bytecodes::_idiv) {
570 __ idiv(left.result(), right.result(), x->operand(), tmp, info);
571 }
572 } else {
573 arithmetic_op_int(x->op(), x->operand(), left.result(), right.result(), FrameMap::G1_opr);
574 }
575 }
576
577
578 void LIRGenerator::do_ArithmeticOp(ArithmeticOp* x) {
579 ValueTag tag = x->type()->tag();
580 assert(x->x()->type()->tag() == tag && x->y()->type()->tag() == tag, "wrong parameters");
581 switch (tag) {
582 case floatTag:
583 case doubleTag: do_ArithmeticOp_FPU(x); return;
584 case longTag: do_ArithmeticOp_Long(x); return;
585 case intTag: do_ArithmeticOp_Int(x); return;
586 }
587 ShouldNotReachHere();
588 }
589
590
591 // _ishl, _lshl, _ishr, _lshr, _iushr, _lushr
592 void LIRGenerator::do_ShiftOp(ShiftOp* x) {
593 LIRItem value(x->x(), this);
594 LIRItem count(x->y(), this);
595 // Long shift destroys count register
596 if (value.type()->is_long()) {
597 count.set_destroys_register();
598 }
599 value.load_item();
600 // the old backend doesn't support this
601 if (count.is_constant() && count.type()->as_IntConstant() != NULL && value.type()->is_int()) {
602 jint c = count.get_jint_constant() & 0x1f;
603 assert(c >= 0 && c < 32, "should be small");
604 count.dont_load_item();
605 } else {
606 count.load_item();
607 }
608 LIR_Opr reg = rlock_result(x);
609 shift_op(x->op(), reg, value.result(), count.result(), LIR_OprFact::illegalOpr);
610 }
611
612
613 // _iand, _land, _ior, _lor, _ixor, _lxor
614 void LIRGenerator::do_LogicOp(LogicOp* x) {
615 LIRItem left(x->x(), this);
616 LIRItem right(x->y(), this);
617
618 left.load_item();
619 right.load_nonconstant();
620 LIR_Opr reg = rlock_result(x);
621
622 logic_op(x->op(), reg, left.result(), right.result());
623 }
624
625
626
627 // _lcmp, _fcmpl, _fcmpg, _dcmpl, _dcmpg
628 void LIRGenerator::do_CompareOp(CompareOp* x) {
629 LIRItem left(x->x(), this);
630 LIRItem right(x->y(), this);
631 left.load_item();
632 right.load_item();
633 LIR_Opr reg = rlock_result(x);
634 if (x->x()->type()->is_float_kind()) {
635 Bytecodes::Code code = x->op();
636 __ fcmp2int(left.result(), right.result(), reg, (code == Bytecodes::_fcmpl || code == Bytecodes::_dcmpl));
637 } else if (x->x()->type()->tag() == longTag) {
638 __ lcmp2int(left.result(), right.result(), reg);
639 } else {
640 Unimplemented();
641 }
642 }
643
644
645 void LIRGenerator::do_CompareAndSwap(Intrinsic* x, ValueType* type) {
646 assert(x->number_of_arguments() == 4, "wrong type");
647 LIRItem obj (x->argument_at(0), this); // object
648 LIRItem offset(x->argument_at(1), this); // offset of field
649 LIRItem cmp (x->argument_at(2), this); // value to compare with field
650 LIRItem val (x->argument_at(3), this); // replace field with val if matches cmp
651
652 // Use temps to avoid kills
653 LIR_Opr t1 = FrameMap::G1_opr;
654 LIR_Opr t2 = FrameMap::G3_opr;
655 LIR_Opr addr = new_pointer_register();
656
657 // get address of field
658 obj.load_item();
659 offset.load_item();
660 cmp.load_item();
661 val.load_item();
662
663 __ add(obj.result(), offset.result(), addr);
664
665 if (type == objectType) { // Write-barrier needed for Object fields.
666 pre_barrier(addr, LIR_OprFact::illegalOpr /* pre_val */,
667 true /* do_load */, false /* patch */, NULL);
668 }
669
670 if (type == objectType)
671 __ cas_obj(addr, cmp.result(), val.result(), t1, t2);
672 else if (type == intType)
673 __ cas_int(addr, cmp.result(), val.result(), t1, t2);
674 else if (type == longType)
675 __ cas_long(addr, cmp.result(), val.result(), t1, t2);
676 else {
677 ShouldNotReachHere();
678 }
679 // generate conditional move of boolean result
680 LIR_Opr result = rlock_result(x);
681 __ cmove(lir_cond_equal, LIR_OprFact::intConst(1), LIR_OprFact::intConst(0),
682 result, as_BasicType(type));
683 if (type == objectType) { // Write-barrier needed for Object fields.
684 // Precise card mark since could either be object or array
685 post_barrier(addr, val.result());
686 }
687 }
688
689
690 void LIRGenerator::do_MathIntrinsic(Intrinsic* x) {
691 switch (x->id()) {
692 case vmIntrinsics::_dabs:
693 case vmIntrinsics::_dsqrt: {
694 assert(x->number_of_arguments() == 1, "wrong type");
695 LIRItem value(x->argument_at(0), this);
696 value.load_item();
697 LIR_Opr dst = rlock_result(x);
698
699 switch (x->id()) {
700 case vmIntrinsics::_dsqrt: {
701 __ sqrt(value.result(), dst, LIR_OprFact::illegalOpr);
702 break;
703 }
704 case vmIntrinsics::_dabs: {
705 __ abs(value.result(), dst, LIR_OprFact::illegalOpr);
706 break;
707 }
708 }
709 break;
710 }
711 case vmIntrinsics::_dlog10: // fall through
712 case vmIntrinsics::_dlog: // fall through
713 case vmIntrinsics::_dsin: // fall through
714 case vmIntrinsics::_dtan: // fall through
715 case vmIntrinsics::_dcos: // fall through
716 case vmIntrinsics::_dexp: {
717 assert(x->number_of_arguments() == 1, "wrong type");
718
719 address runtime_entry = NULL;
720 switch (x->id()) {
721 case vmIntrinsics::_dsin:
722 runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsin);
723 break;
724 case vmIntrinsics::_dcos:
725 runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dcos);
726 break;
727 case vmIntrinsics::_dtan:
728 runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dtan);
729 break;
730 case vmIntrinsics::_dlog:
731 runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog);
732 break;
733 case vmIntrinsics::_dlog10:
734 runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog10);
735 break;
736 case vmIntrinsics::_dexp:
737 runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dexp);
738 break;
739 default:
740 ShouldNotReachHere();
741 }
742
743 LIR_Opr result = call_runtime(x->argument_at(0), runtime_entry, x->type(), NULL);
744 set_result(x, result);
745 break;
746 }
747 case vmIntrinsics::_dpow: {
748 assert(x->number_of_arguments() == 2, "wrong type");
749 address runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dpow);
750 LIR_Opr result = call_runtime(x->argument_at(0), x->argument_at(1), runtime_entry, x->type(), NULL);
751 set_result(x, result);
752 break;
753 }
754 }
755 }
756
757
758 void LIRGenerator::do_ArrayCopy(Intrinsic* x) {
759 assert(x->number_of_arguments() == 5, "wrong type");
760
761 // Make all state_for calls early since they can emit code
762 CodeEmitInfo* info = state_for(x, x->state());
763
764 // Note: spill caller save before setting the item
765 LIRItem src (x->argument_at(0), this);
766 LIRItem src_pos (x->argument_at(1), this);
767 LIRItem dst (x->argument_at(2), this);
768 LIRItem dst_pos (x->argument_at(3), this);
769 LIRItem length (x->argument_at(4), this);
770 // load all values in callee_save_registers, as this makes the
771 // parameter passing to the fast case simpler
772 src.load_item_force (rlock_callee_saved(T_OBJECT));
773 src_pos.load_item_force (rlock_callee_saved(T_INT));
774 dst.load_item_force (rlock_callee_saved(T_OBJECT));
775 dst_pos.load_item_force (rlock_callee_saved(T_INT));
776 length.load_item_force (rlock_callee_saved(T_INT));
777
778 int flags;
779 ciArrayKlass* expected_type;
780 arraycopy_helper(x, &flags, &expected_type);
781
782 __ arraycopy(src.result(), src_pos.result(), dst.result(), dst_pos.result(),
783 length.result(), rlock_callee_saved(T_INT),
784 expected_type, flags, info);
785 set_no_result(x);
786 }
787
788 void LIRGenerator::do_update_CRC32(Intrinsic* x) {
789 fatal("CRC32 intrinsic is not implemented on this platform");
790 }
791
792 // _i2l, _i2f, _i2d, _l2i, _l2f, _l2d, _f2i, _f2l, _f2d, _d2i, _d2l, _d2f
793 // _i2b, _i2c, _i2s
794 void LIRGenerator::do_Convert(Convert* x) {
795
796 switch (x->op()) {
797 case Bytecodes::_f2l:
798 case Bytecodes::_d2l:
799 case Bytecodes::_d2i:
800 case Bytecodes::_l2f:
801 case Bytecodes::_l2d: {
802
803 address entry;
804 switch (x->op()) {
805 case Bytecodes::_l2f:
806 entry = CAST_FROM_FN_PTR(address, SharedRuntime::l2f);
807 break;
808 case Bytecodes::_l2d:
809 entry = CAST_FROM_FN_PTR(address, SharedRuntime::l2d);
810 break;
811 case Bytecodes::_f2l:
812 entry = CAST_FROM_FN_PTR(address, SharedRuntime::f2l);
813 break;
814 case Bytecodes::_d2l:
815 entry = CAST_FROM_FN_PTR(address, SharedRuntime::d2l);
816 break;
817 case Bytecodes::_d2i:
818 entry = CAST_FROM_FN_PTR(address, SharedRuntime::d2i);
819 break;
820 default:
821 ShouldNotReachHere();
822 }
823 LIR_Opr result = call_runtime(x->value(), entry, x->type(), NULL);
824 set_result(x, result);
825 break;
826 }
827
828 case Bytecodes::_i2f:
829 case Bytecodes::_i2d: {
830 LIRItem value(x->value(), this);
831
832 LIR_Opr reg = rlock_result(x);
833 // To convert an int to double, we need to load the 32-bit int
834 // from memory into a single precision floating point register
835 // (even numbered). Then the sparc fitod instruction takes care
836 // of the conversion. This is a bit ugly, but is the best way to
837 // get the int value in a single precision floating point register
838 value.load_item();
839 LIR_Opr tmp = force_to_spill(value.result(), T_FLOAT);
840 __ convert(x->op(), tmp, reg);
841 break;
842 }
843 break;
844
845 case Bytecodes::_i2l:
846 case Bytecodes::_i2b:
847 case Bytecodes::_i2c:
848 case Bytecodes::_i2s:
849 case Bytecodes::_l2i:
850 case Bytecodes::_f2d:
851 case Bytecodes::_d2f: { // inline code
852 LIRItem value(x->value(), this);
853
854 value.load_item();
855 LIR_Opr reg = rlock_result(x);
856 __ convert(x->op(), value.result(), reg, false);
857 }
858 break;
859
860 case Bytecodes::_f2i: {
861 LIRItem value (x->value(), this);
862 value.set_destroys_register();
863 value.load_item();
864 LIR_Opr reg = rlock_result(x);
865 set_vreg_flag(reg, must_start_in_memory);
866 __ convert(x->op(), value.result(), reg, false);
867 }
868 break;
869
870 default: ShouldNotReachHere();
871 }
872 }
873
874
875 void LIRGenerator::do_NewInstance(NewInstance* x) {
876 print_if_not_loaded(x);
877
878 // This instruction can be deoptimized in the slow path : use
879 // O0 as result register.
880 const LIR_Opr reg = result_register_for(x->type());
881
882 CodeEmitInfo* info = state_for(x, x->state());
883 LIR_Opr tmp1 = FrameMap::G1_oop_opr;
884 LIR_Opr tmp2 = FrameMap::G3_oop_opr;
885 LIR_Opr tmp3 = FrameMap::G4_oop_opr;
886 LIR_Opr tmp4 = FrameMap::O1_oop_opr;
887 LIR_Opr klass_reg = FrameMap::G5_metadata_opr;
888 new_instance(reg, x->klass(), x->is_unresolved(), tmp1, tmp2, tmp3, tmp4, klass_reg, info);
889 LIR_Opr result = rlock_result(x);
890 __ move(reg, result);
891 }
892
893
894 void LIRGenerator::do_NewTypeArray(NewTypeArray* x) {
895 // Evaluate state_for early since it may emit code
896 CodeEmitInfo* info = state_for(x, x->state());
897
898 LIRItem length(x->length(), this);
899 length.load_item();
900
901 LIR_Opr reg = result_register_for(x->type());
902 LIR_Opr tmp1 = FrameMap::G1_oop_opr;
903 LIR_Opr tmp2 = FrameMap::G3_oop_opr;
904 LIR_Opr tmp3 = FrameMap::G4_oop_opr;
905 LIR_Opr tmp4 = FrameMap::O1_oop_opr;
906 LIR_Opr klass_reg = FrameMap::G5_metadata_opr;
907 LIR_Opr len = length.result();
908 BasicType elem_type = x->elt_type();
909
910 __ metadata2reg(ciTypeArrayKlass::make(elem_type)->constant_encoding(), klass_reg);
911
912 CodeStub* slow_path = new NewTypeArrayStub(klass_reg, len, reg, info);
913 __ allocate_array(reg, len, tmp1, tmp2, tmp3, tmp4, elem_type, klass_reg, slow_path);
914
915 LIR_Opr result = rlock_result(x);
916 __ move(reg, result);
917 }
918
919
920 void LIRGenerator::do_NewObjectArray(NewObjectArray* x) {
921 // Evaluate state_for early since it may emit code.
922 CodeEmitInfo* info = state_for(x, x->state());
923 // in case of patching (i.e., object class is not yet loaded), we need to reexecute the instruction
924 // and therefore provide the state before the parameters have been consumed
925 CodeEmitInfo* patching_info = NULL;
926 if (!x->klass()->is_loaded() || PatchALot) {
927 patching_info = state_for(x, x->state_before());
928 }
929
930 LIRItem length(x->length(), this);
931 length.load_item();
932
933 const LIR_Opr reg = result_register_for(x->type());
934 LIR_Opr tmp1 = FrameMap::G1_oop_opr;
935 LIR_Opr tmp2 = FrameMap::G3_oop_opr;
936 LIR_Opr tmp3 = FrameMap::G4_oop_opr;
937 LIR_Opr tmp4 = FrameMap::O1_oop_opr;
938 LIR_Opr klass_reg = FrameMap::G5_metadata_opr;
939 LIR_Opr len = length.result();
940
941 CodeStub* slow_path = new NewObjectArrayStub(klass_reg, len, reg, info);
942 ciMetadata* obj = ciObjArrayKlass::make(x->klass());
943 if (obj == ciEnv::unloaded_ciobjarrayklass()) {
944 BAILOUT("encountered unloaded_ciobjarrayklass due to out of memory error");
945 }
946 klass2reg_with_patching(klass_reg, obj, patching_info);
947 __ allocate_array(reg, len, tmp1, tmp2, tmp3, tmp4, T_OBJECT, klass_reg, slow_path);
948
949 LIR_Opr result = rlock_result(x);
950 __ move(reg, result);
951 }
952
953
954 void LIRGenerator::do_NewMultiArray(NewMultiArray* x) {
955 Values* dims = x->dims();
956 int i = dims->length();
957 LIRItemList* items = new LIRItemList(dims->length(), NULL);
958 while (i-- > 0) {
959 LIRItem* size = new LIRItem(dims->at(i), this);
960 items->at_put(i, size);
961 }
962
963 // Evaluate state_for early since it may emit code.
964 CodeEmitInfo* patching_info = NULL;
965 if (!x->klass()->is_loaded() || PatchALot) {
966 patching_info = state_for(x, x->state_before());
967
968 // Cannot re-use same xhandlers for multiple CodeEmitInfos, so
969 // clone all handlers (NOTE: Usually this is handled transparently
970 // by the CodeEmitInfo cloning logic in CodeStub constructors but
971 // is done explicitly here because a stub isn't being used).
972 x->set_exception_handlers(new XHandlers(x->exception_handlers()));
973 }
974 CodeEmitInfo* info = state_for(x, x->state());
975
976 i = dims->length();
977 while (i-- > 0) {
978 LIRItem* size = items->at(i);
979 size->load_item();
980 store_stack_parameter (size->result(),
981 in_ByteSize(STACK_BIAS +
982 frame::memory_parameter_word_sp_offset * wordSize +
983 i * sizeof(jint)));
984 }
985
986 // This instruction can be deoptimized in the slow path : use
987 // O0 as result register.
988 const LIR_Opr klass_reg = FrameMap::O0_metadata_opr;
989 klass2reg_with_patching(klass_reg, x->klass(), patching_info);
990 LIR_Opr rank = FrameMap::O1_opr;
991 __ move(LIR_OprFact::intConst(x->rank()), rank);
992 LIR_Opr varargs = FrameMap::as_pointer_opr(O2);
993 int offset_from_sp = (frame::memory_parameter_word_sp_offset * wordSize) + STACK_BIAS;
994 __ add(FrameMap::SP_opr,
995 LIR_OprFact::intptrConst(offset_from_sp),
996 varargs);
997 LIR_OprList* args = new LIR_OprList(3);
998 args->append(klass_reg);
999 args->append(rank);
1000 args->append(varargs);
1001 const LIR_Opr reg = result_register_for(x->type());
1002 __ call_runtime(Runtime1::entry_for(Runtime1::new_multi_array_id),
1003 LIR_OprFact::illegalOpr,
1004 reg, args, info);
1005
1006 LIR_Opr result = rlock_result(x);
1007 __ move(reg, result);
1008 }
1009
1010
1011 void LIRGenerator::do_BlockBegin(BlockBegin* x) {
1012 }
1013
1014
1015 void LIRGenerator::do_CheckCast(CheckCast* x) {
1016 LIRItem obj(x->obj(), this);
1017 CodeEmitInfo* patching_info = NULL;
1018 if (!x->klass()->is_loaded() || (PatchALot && !x->is_incompatible_class_change_check())) {
1019 // must do this before locking the destination register as an oop register,
1020 // and before the obj is loaded (so x->obj()->item() is valid for creating a debug info location)
1021 patching_info = state_for(x, x->state_before());
1022 }
1023 obj.load_item();
1024 LIR_Opr out_reg = rlock_result(x);
1025 CodeStub* stub;
1026 CodeEmitInfo* info_for_exception =
1027 (x->needs_exception_state() ? state_for(x) :
1028 state_for(x, x->state_before(), true /*ignore_xhandler*/));
1029
1030 if (x->is_incompatible_class_change_check()) {
1031 assert(patching_info == NULL, "can't patch this");
1032 stub = new SimpleExceptionStub(Runtime1::throw_incompatible_class_change_error_id, LIR_OprFact::illegalOpr, info_for_exception);
1033 } else if (x->is_invokespecial_receiver_check()) {
1034 assert(patching_info == NULL, "can't patch this");
1035 stub = new DeoptimizeStub(info_for_exception);
1036 } else {
1037 stub = new SimpleExceptionStub(Runtime1::throw_class_cast_exception_id, obj.result(), info_for_exception);
1038 }
1039 LIR_Opr tmp1 = FrameMap::G1_oop_opr;
1040 LIR_Opr tmp2 = FrameMap::G3_oop_opr;
1041 LIR_Opr tmp3 = FrameMap::G4_oop_opr;
1042 __ checkcast(out_reg, obj.result(), x->klass(), tmp1, tmp2, tmp3,
1043 x->direct_compare(), info_for_exception, patching_info, stub,
1044 x->profiled_method(), x->profiled_bci());
1045 }
1046
1047
1048 void LIRGenerator::do_InstanceOf(InstanceOf* x) {
1049 LIRItem obj(x->obj(), this);
1050 CodeEmitInfo* patching_info = NULL;
1051 if (!x->klass()->is_loaded() || PatchALot) {
1052 patching_info = state_for(x, x->state_before());
1053 }
1054 // ensure the result register is not the input register because the result is initialized before the patching safepoint
1055 obj.load_item();
1056 LIR_Opr out_reg = rlock_result(x);
1057 LIR_Opr tmp1 = FrameMap::G1_oop_opr;
1058 LIR_Opr tmp2 = FrameMap::G3_oop_opr;
1059 LIR_Opr tmp3 = FrameMap::G4_oop_opr;
1060 __ instanceof(out_reg, obj.result(), x->klass(), tmp1, tmp2, tmp3,
1061 x->direct_compare(), patching_info,
1062 x->profiled_method(), x->profiled_bci());
1063 }
1064
1065
1066 void LIRGenerator::do_If(If* x) {
1067 assert(x->number_of_sux() == 2, "inconsistency");
1068 ValueTag tag = x->x()->type()->tag();
1069 LIRItem xitem(x->x(), this);
1070 LIRItem yitem(x->y(), this);
1071 LIRItem* xin = &xitem;
1072 LIRItem* yin = &yitem;
1073 If::Condition cond = x->cond();
1074
1075 if (tag == longTag) {
1076 // for longs, only conditions "eql", "neq", "lss", "geq" are valid;
1077 // mirror for other conditions
1078 if (cond == If::gtr || cond == If::leq) {
1079 // swap inputs
1080 cond = Instruction::mirror(cond);
1081 xin = &yitem;
1082 yin = &xitem;
1083 }
1084 xin->set_destroys_register();
1085 }
1086
1087 LIR_Opr left = LIR_OprFact::illegalOpr;
1088 LIR_Opr right = LIR_OprFact::illegalOpr;
1089
1090 xin->load_item();
1091 left = xin->result();
1092
1093 if (is_simm13(yin->result())) {
1094 // inline int constants which are small enough to be immediate operands
1095 right = LIR_OprFact::value_type(yin->value()->type());
1096 } else if (tag == longTag && yin->is_constant() && yin->get_jlong_constant() == 0 &&
1097 (cond == If::eql || cond == If::neq)) {
1098 // inline long zero
1099 right = LIR_OprFact::value_type(yin->value()->type());
1100 } else if (tag == objectTag && yin->is_constant() && (yin->get_jobject_constant()->is_null_object())) {
1101 right = LIR_OprFact::value_type(yin->value()->type());
1102 } else {
1103 yin->load_item();
1104 right = yin->result();
1105 }
1106 set_no_result(x);
1107
1108 // add safepoint before generating condition code so it can be recomputed
1109 if (x->is_safepoint()) {
1110 // increment backedge counter if needed
1111 increment_backedge_counter(state_for(x, x->state_before()), x->profiled_bci());
1112 __ safepoint(new_register(T_INT), state_for(x, x->state_before()));
1113 }
1114
1115 __ cmp(lir_cond(cond), left, right);
1116 // Generate branch profiling. Profiling code doesn't kill flags.
1117 profile_branch(x, cond);
1118 move_to_phi(x->state());
1119 if (x->x()->type()->is_float_kind()) {
1120 __ branch(lir_cond(cond), right->type(), x->tsux(), x->usux());
1121 } else {
1122 __ branch(lir_cond(cond), right->type(), x->tsux());
1123 }
1124 assert(x->default_sux() == x->fsux(), "wrong destination above");
1125 __ jump(x->default_sux());
1126 }
1127
1128
1129 LIR_Opr LIRGenerator::getThreadPointer() {
1130 return FrameMap::as_pointer_opr(G2);
1131 }
1132
1133
1134 void LIRGenerator::trace_block_entry(BlockBegin* block) {
1135 __ move(LIR_OprFact::intConst(block->block_id()), FrameMap::O0_opr);
1136 LIR_OprList* args = new LIR_OprList(1);
1137 args->append(FrameMap::O0_opr);
1138 address func = CAST_FROM_FN_PTR(address, Runtime1::trace_block_entry);
1139 __ call_runtime_leaf(func, rlock_callee_saved(T_INT), LIR_OprFact::illegalOpr, args);
1140 }
1141
1142
1143 void LIRGenerator::volatile_field_store(LIR_Opr value, LIR_Address* address,
1144 CodeEmitInfo* info) {
1145 #ifdef _LP64
1146 __ store(value, address, info);
1147 #else
1148 __ volatile_store_mem_reg(value, address, info);
1149 #endif
1150 }
1151
1152 void LIRGenerator::volatile_field_load(LIR_Address* address, LIR_Opr result,
1153 CodeEmitInfo* info) {
1154 #ifdef _LP64
1155 __ load(address, result, info);
1156 #else
1157 __ volatile_load_mem_reg(address, result, info);
1158 #endif
1159 }
1160
1161
1162 void LIRGenerator::put_Object_unsafe(LIR_Opr src, LIR_Opr offset, LIR_Opr data,
1163 BasicType type, bool is_volatile) {
1164 LIR_Opr base_op = src;
1165 LIR_Opr index_op = offset;
1166
1167 bool is_obj = (type == T_ARRAY || type == T_OBJECT);
1168 #ifndef _LP64
1169 if (is_volatile && type == T_LONG) {
1170 __ volatile_store_unsafe_reg(data, src, offset, type, NULL, lir_patch_none);
1171 } else
1172 #endif
1173 {
1174 if (type == T_BOOLEAN) {
1175 type = T_BYTE;
1176 }
1177 LIR_Address* addr;
1178 if (type == T_ARRAY || type == T_OBJECT) {
1179 LIR_Opr tmp = new_pointer_register();
1180 __ add(base_op, index_op, tmp);
1181 addr = new LIR_Address(tmp, type);
1182 } else {
1183 addr = new LIR_Address(base_op, index_op, type);
1184 }
1185
1186 if (is_obj) {
1187 pre_barrier(LIR_OprFact::address(addr), LIR_OprFact::illegalOpr /* pre_val */,
1188 true /* do_load */, false /* patch */, NULL);
1189 // _bs->c1_write_barrier_pre(this, LIR_OprFact::address(addr));
1190 }
1191 __ move(data, addr);
1192 if (is_obj) {
1193 // This address is precise
1194 post_barrier(LIR_OprFact::address(addr), data);
1195 }
1196 }
1197 }
1198
1199
1200 void LIRGenerator::get_Object_unsafe(LIR_Opr dst, LIR_Opr src, LIR_Opr offset,
1201 BasicType type, bool is_volatile) {
1202 #ifndef _LP64
1203 if (is_volatile && type == T_LONG) {
1204 __ volatile_load_unsafe_reg(src, offset, dst, type, NULL, lir_patch_none);
1205 } else
1206 #endif
1207 {
1208 LIR_Address* addr = new LIR_Address(src, offset, type);
1209 __ load(addr, dst);
1210 }
1211 }
1212
1213 void LIRGenerator::do_UnsafeGetAndSetObject(UnsafeGetAndSetObject* x) {
1214 BasicType type = x->basic_type();
1215 LIRItem src(x->object(), this);
1216 LIRItem off(x->offset(), this);
1217 LIRItem value(x->value(), this);
1218
1219 src.load_item();
1220 value.load_item();
1221 off.load_nonconstant();
1222
1223 LIR_Opr dst = rlock_result(x, type);
1224 LIR_Opr data = value.result();
1225 bool is_obj = (type == T_ARRAY || type == T_OBJECT);
1226 LIR_Opr offset = off.result();
1227
1228 // Because we want a 2-arg form of xchg
1229 __ move(data, dst);
1230
1231 assert (!x->is_add() && (type == T_INT || (is_obj LP64_ONLY(&& UseCompressedOops))), "unexpected type");
1232 LIR_Address* addr;
1233 if (offset->is_constant()) {
1234
1235 #ifdef _LP64
1236 jlong l = offset->as_jlong();
1237 assert((jlong)((jint)l) == l, "offset too large for constant");
1238 jint c = (jint)l;
1239 #else
1240 jint c = offset->as_jint();
1241 #endif
1242 addr = new LIR_Address(src.result(), c, type);
1243 } else {
1244 addr = new LIR_Address(src.result(), offset, type);
1245 }
1246
1247 LIR_Opr tmp = LIR_OprFact::illegalOpr;
1248 LIR_Opr ptr = LIR_OprFact::illegalOpr;
1249
1250 if (is_obj) {
1251 // Do the pre-write barrier, if any.
1252 // barriers on sparc don't work with a base + index address
1253 tmp = FrameMap::G3_opr;
1254 ptr = new_pointer_register();
1255 __ add(src.result(), off.result(), ptr);
1256 pre_barrier(ptr, LIR_OprFact::illegalOpr /* pre_val */,
1257 true /* do_load */, false /* patch */, NULL);
1258 }
1259 __ xchg(LIR_OprFact::address(addr), dst, dst, tmp);
1260 if (is_obj) {
1261 // Seems to be a precise address
1262 post_barrier(ptr, data);
1263 }
1264 }