1 /* 2 * Copyright (c) 2007, 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 #include "precompiled.hpp" 25 #include "compiler/compileLog.hpp" 26 #include "libadt/vectset.hpp" 27 #include "memory/allocation.inline.hpp" 28 #include "opto/addnode.hpp" 29 #include "opto/callnode.hpp" 30 #include "opto/castnode.hpp" 31 #include "opto/convertnode.hpp" 32 #include "opto/divnode.hpp" 33 #include "opto/matcher.hpp" 34 #include "opto/memnode.hpp" 35 #include "opto/mulnode.hpp" 36 #include "opto/opcodes.hpp" 37 #include "opto/opaquenode.hpp" 38 #include "opto/superword.hpp" 39 #include "opto/vectornode.hpp" 40 41 // 42 // S U P E R W O R D T R A N S F O R M 43 //============================================================================= 44 45 //------------------------------SuperWord--------------------------- 46 SuperWord::SuperWord(PhaseIdealLoop* phase) : 47 _phase(phase), 48 _igvn(phase->_igvn), 49 _arena(phase->C->comp_arena()), 50 _packset(arena(), 8, 0, NULL), // packs for the current block 51 _bb_idx(arena(), (int)(1.10 * phase->C->unique()), 0, 0), // node idx to index in bb 52 _block(arena(), 8, 0, NULL), // nodes in current block 53 _data_entry(arena(), 8, 0, NULL), // nodes with all inputs from outside 54 _mem_slice_head(arena(), 8, 0, NULL), // memory slice heads 55 _mem_slice_tail(arena(), 8, 0, NULL), // memory slice tails 56 _node_info(arena(), 8, 0, SWNodeInfo::initial), // info needed per node 57 _clone_map(phase->C->clone_map()), // map of nodes created in cloning 58 _align_to_ref(NULL), // memory reference to align vectors to 59 _disjoint_ptrs(arena(), 8, 0, OrderedPair::initial), // runtime disambiguated pointer pairs 60 _dg(_arena), // dependence graph 61 _visited(arena()), // visited node set 62 _post_visited(arena()), // post visited node set 63 _n_idx_list(arena(), 8), // scratch list of (node,index) pairs 64 _stk(arena(), 8, 0, NULL), // scratch stack of nodes 65 _nlist(arena(), 8, 0, NULL), // scratch list of nodes 66 _lpt(NULL), // loop tree node 67 _lp(NULL), // LoopNode 68 _bb(NULL), // basic block 69 _iv(NULL), // induction var 70 _race_possible(false), // cases where SDMU is true 71 _early_return(true), // analysis evaluations routine 72 _num_work_vecs(0), // amount of vector work we have 73 _num_reductions(0), // amount of reduction work we have 74 _do_vector_loop(phase->C->do_vector_loop()), // whether to do vectorization/simd style 75 _ii_first(-1), // first loop generation index - only if do_vector_loop() 76 _ii_last(-1), // last loop generation index - only if do_vector_loop() 77 _ii_order(arena(), 8, 0, 0) 78 { 79 #ifndef PRODUCT 80 _vector_loop_debug = 0; 81 if (_phase->C->method() != NULL) { 82 _phase->C->method()->has_option_value("VectorizeDebug", _vector_loop_debug); 83 } 84 #endif 85 } 86 87 //------------------------------transform_loop--------------------------- 88 void SuperWord::transform_loop(IdealLoopTree* lpt, bool do_optimization) { 89 assert(UseSuperWord, "should be"); 90 // Do vectors exist on this architecture? 91 if (Matcher::vector_width_in_bytes(T_BYTE) < 2) return; 92 93 assert(lpt->_head->is_CountedLoop(), "must be"); 94 CountedLoopNode *cl = lpt->_head->as_CountedLoop(); 95 96 if (!cl->is_valid_counted_loop()) return; // skip malformed counted loop 97 98 if (!cl->is_main_loop() ) return; // skip normal, pre, and post loops 99 // Check for no control flow in body (other than exit) 100 Node *cl_exit = cl->loopexit(); 101 if (cl_exit->in(0) != lpt->_head) return; 102 103 // Make sure the are no extra control users of the loop backedge 104 if (cl->back_control()->outcnt() != 1) { 105 return; 106 } 107 108 // We only re-enter slp when we vector mapped a queried loop and we want to 109 // continue unrolling, in this case, slp is not subsequently done. 110 if (cl->do_unroll_only()) return; 111 112 // Check for pre-loop ending with CountedLoopEnd(Bool(Cmp(x,Opaque1(limit)))) 113 CountedLoopEndNode* pre_end = get_pre_loop_end(cl); 114 if (pre_end == NULL) return; 115 Node *pre_opaq1 = pre_end->limit(); 116 if (pre_opaq1->Opcode() != Op_Opaque1) return; 117 118 init(); // initialize data structures 119 120 set_lpt(lpt); 121 set_lp(cl); 122 123 // For now, define one block which is the entire loop body 124 set_bb(cl); 125 126 if (do_optimization) { 127 assert(_packset.length() == 0, "packset must be empty"); 128 SLP_extract(); 129 } 130 } 131 132 //------------------------------early unrolling analysis------------------------------ 133 void SuperWord::unrolling_analysis(int &local_loop_unroll_factor) { 134 bool is_slp = true; 135 ResourceMark rm; 136 size_t ignored_size = lpt()->_body.size(); 137 int *ignored_loop_nodes = NEW_RESOURCE_ARRAY(int, ignored_size); 138 Node_Stack nstack((int)ignored_size); 139 CountedLoopNode *cl = lpt()->_head->as_CountedLoop(); 140 Node *cl_exit = cl->loopexit(); 141 142 // First clear the entries 143 for (uint i = 0; i < lpt()->_body.size(); i++) { 144 ignored_loop_nodes[i] = -1; 145 } 146 147 int max_vector = Matcher::max_vector_size(T_INT); 148 149 // Process the loop, some/all of the stack entries will not be in order, ergo 150 // need to preprocess the ignored initial state before we process the loop 151 for (uint i = 0; i < lpt()->_body.size(); i++) { 152 Node* n = lpt()->_body.at(i); 153 if (n == cl->incr() || 154 n->is_reduction() || 155 n->is_AddP() || 156 n->is_Cmp() || 157 n->is_IfTrue() || 158 n->is_CountedLoop() || 159 (n == cl_exit)) { 160 ignored_loop_nodes[i] = n->_idx; 161 continue; 162 } 163 164 if (n->is_If()) { 165 IfNode *iff = n->as_If(); 166 if (iff->_fcnt != COUNT_UNKNOWN && iff->_prob != PROB_UNKNOWN) { 167 if (lpt()->is_loop_exit(iff)) { 168 ignored_loop_nodes[i] = n->_idx; 169 continue; 170 } 171 } 172 } 173 174 if (n->is_Phi() && (n->bottom_type() == Type::MEMORY)) { 175 Node* n_tail = n->in(LoopNode::LoopBackControl); 176 if (n_tail != n->in(LoopNode::EntryControl)) { 177 if (!n_tail->is_Mem()) { 178 is_slp = false; 179 break; 180 } 181 } 182 } 183 184 // This must happen after check of phi/if 185 if (n->is_Phi() || n->is_If()) { 186 ignored_loop_nodes[i] = n->_idx; 187 continue; 188 } 189 190 if (n->is_LoadStore() || n->is_MergeMem() || 191 (n->is_Proj() && !n->as_Proj()->is_CFG())) { 192 is_slp = false; 193 break; 194 } 195 196 // Ignore nodes with non-primitive type. 197 BasicType bt; 198 if (n->is_Mem()) { 199 bt = n->as_Mem()->memory_type(); 200 } else { 201 bt = n->bottom_type()->basic_type(); 202 } 203 if (is_java_primitive(bt) == false) { 204 ignored_loop_nodes[i] = n->_idx; 205 continue; 206 } 207 208 if (n->is_Mem()) { 209 MemNode* current = n->as_Mem(); 210 Node* adr = n->in(MemNode::Address); 211 Node* n_ctrl = _phase->get_ctrl(adr); 212 213 // save a queue of post process nodes 214 if (n_ctrl != NULL && lpt()->is_member(_phase->get_loop(n_ctrl))) { 215 // Process the memory expression 216 int stack_idx = 0; 217 bool have_side_effects = true; 218 if (adr->is_AddP() == false) { 219 nstack.push(adr, stack_idx++); 220 } else { 221 // Mark the components of the memory operation in nstack 222 SWPointer p1(current, this, &nstack, true); 223 have_side_effects = p1.node_stack()->is_nonempty(); 224 } 225 226 // Process the pointer stack 227 while (have_side_effects) { 228 Node* pointer_node = nstack.node(); 229 for (uint j = 0; j < lpt()->_body.size(); j++) { 230 Node* cur_node = lpt()->_body.at(j); 231 if (cur_node == pointer_node) { 232 ignored_loop_nodes[j] = cur_node->_idx; 233 break; 234 } 235 } 236 nstack.pop(); 237 have_side_effects = nstack.is_nonempty(); 238 } 239 } 240 } 241 } 242 243 if (is_slp) { 244 // Now we try to find the maximum supported consistent vector which the machine 245 // description can use 246 for (uint i = 0; i < lpt()->_body.size(); i++) { 247 if (ignored_loop_nodes[i] != -1) continue; 248 249 BasicType bt; 250 Node* n = lpt()->_body.at(i); 251 if (n->is_Mem()) { 252 bt = n->as_Mem()->memory_type(); 253 } else { 254 bt = n->bottom_type()->basic_type(); 255 } 256 if (is_java_primitive(bt) == false) continue; 257 258 int cur_max_vector = Matcher::max_vector_size(bt); 259 260 // If a max vector exists which is not larger than _local_loop_unroll_factor 261 // stop looking, we already have the max vector to map to. 262 if (cur_max_vector < local_loop_unroll_factor) { 263 is_slp = false; 264 NOT_PRODUCT(if (TraceSuperWordLoopUnrollAnalysis) tty->print_cr("slp analysis fails: unroll limit greater than max vector\n")); 265 break; 266 } 267 268 // Map the maximal common vector 269 if (VectorNode::implemented(n->Opcode(), cur_max_vector, bt)) { 270 if (cur_max_vector < max_vector) { 271 max_vector = cur_max_vector; 272 } 273 } 274 } 275 if (is_slp) { 276 local_loop_unroll_factor = max_vector; 277 cl->mark_passed_slp(); 278 } 279 cl->mark_was_slp(); 280 cl->set_slp_max_unroll(local_loop_unroll_factor); 281 } 282 } 283 284 //------------------------------SLP_extract--------------------------- 285 // Extract the superword level parallelism 286 // 287 // 1) A reverse post-order of nodes in the block is constructed. By scanning 288 // this list from first to last, all definitions are visited before their uses. 289 // 290 // 2) A point-to-point dependence graph is constructed between memory references. 291 // This simplies the upcoming "independence" checker. 292 // 293 // 3) The maximum depth in the node graph from the beginning of the block 294 // to each node is computed. This is used to prune the graph search 295 // in the independence checker. 296 // 297 // 4) For integer types, the necessary bit width is propagated backwards 298 // from stores to allow packed operations on byte, char, and short 299 // integers. This reverses the promotion to type "int" that javac 300 // did for operations like: char c1,c2,c3; c1 = c2 + c3. 301 // 302 // 5) One of the memory references is picked to be an aligned vector reference. 303 // The pre-loop trip count is adjusted to align this reference in the 304 // unrolled body. 305 // 306 // 6) The initial set of pack pairs is seeded with memory references. 307 // 308 // 7) The set of pack pairs is extended by following use->def and def->use links. 309 // 310 // 8) The pairs are combined into vector sized packs. 311 // 312 // 9) Reorder the memory slices to co-locate members of the memory packs. 313 // 314 // 10) Generate ideal vector nodes for the final set of packs and where necessary, 315 // inserting scalar promotion, vector creation from multiple scalars, and 316 // extraction of scalar values from vectors. 317 // 318 void SuperWord::SLP_extract() { 319 320 #ifndef PRODUCT 321 if (_do_vector_loop && TraceSuperWord) { 322 tty->print("SuperWord::SLP_extract\n"); 323 tty->print("input loop\n"); 324 _lpt->dump_head(); 325 _lpt->dump(); 326 for (uint i = 0; i < _lpt->_body.size(); i++) { 327 _lpt->_body.at(i)->dump(); 328 } 329 } 330 #endif 331 // Ready the block 332 if (!construct_bb()) { 333 return; // Exit if no interesting nodes or complex graph. 334 } 335 // build _dg, _disjoint_ptrs 336 dependence_graph(); 337 338 // compute function depth(Node*) 339 compute_max_depth(); 340 341 if (_do_vector_loop) { 342 if (mark_generations() != -1) { 343 hoist_loads_in_graph(); // this only rebuild the graph; all basic structs need rebuild explicitly 344 345 if (!construct_bb()) { 346 return; // Exit if no interesting nodes or complex graph. 347 } 348 dependence_graph(); 349 compute_max_depth(); 350 } 351 352 #ifndef PRODUCT 353 if (TraceSuperWord) { 354 tty->print_cr("\nSuperWord::_do_vector_loop: graph after hoist_loads_in_graph"); 355 _lpt->dump_head(); 356 for (int j = 0; j < _block.length(); j++) { 357 Node* n = _block.at(j); 358 int d = depth(n); 359 for (int i = 0; i < d; i++) tty->print("%s", " "); 360 tty->print("%d :", d); 361 n->dump(); 362 } 363 } 364 #endif 365 } 366 367 compute_vector_element_type(); 368 369 // Attempt vectorization 370 371 find_adjacent_refs(); 372 373 extend_packlist(); 374 375 if (_do_vector_loop) { 376 if (_packset.length() == 0) { 377 #ifndef PRODUCT 378 if (TraceSuperWord) { 379 tty->print_cr("\nSuperWord::_do_vector_loop DFA could not build packset, now trying to build anyway"); 380 } 381 #endif 382 pack_parallel(); 383 } 384 } 385 386 combine_packs(); 387 388 construct_my_pack_map(); 389 390 filter_packs(); 391 392 schedule(); 393 394 output(); 395 } 396 397 //------------------------------find_adjacent_refs--------------------------- 398 // Find the adjacent memory references and create pack pairs for them. 399 // This is the initial set of packs that will then be extended by 400 // following use->def and def->use links. The align positions are 401 // assigned relative to the reference "align_to_ref" 402 void SuperWord::find_adjacent_refs() { 403 // Get list of memory operations 404 Node_List memops; 405 for (int i = 0; i < _block.length(); i++) { 406 Node* n = _block.at(i); 407 if (n->is_Mem() && !n->is_LoadStore() && in_bb(n) && 408 is_java_primitive(n->as_Mem()->memory_type())) { 409 int align = memory_alignment(n->as_Mem(), 0); 410 if (align != bottom_align) { 411 memops.push(n); 412 } 413 } 414 } 415 416 Node_List align_to_refs; 417 int best_iv_adjustment = 0; 418 MemNode* best_align_to_mem_ref = NULL; 419 420 while (memops.size() != 0) { 421 // Find a memory reference to align to. 422 MemNode* mem_ref = find_align_to_ref(memops); 423 if (mem_ref == NULL) break; 424 align_to_refs.push(mem_ref); 425 int iv_adjustment = get_iv_adjustment(mem_ref); 426 427 if (best_align_to_mem_ref == NULL) { 428 // Set memory reference which is the best from all memory operations 429 // to be used for alignment. The pre-loop trip count is modified to align 430 // this reference to a vector-aligned address. 431 best_align_to_mem_ref = mem_ref; 432 best_iv_adjustment = iv_adjustment; 433 NOT_PRODUCT(find_adjacent_refs_trace_1(best_align_to_mem_ref, best_iv_adjustment);) 434 } 435 436 SWPointer align_to_ref_p(mem_ref, this, NULL, false); 437 // Set alignment relative to "align_to_ref" for all related memory operations. 438 for (int i = memops.size() - 1; i >= 0; i--) { 439 MemNode* s = memops.at(i)->as_Mem(); 440 if (isomorphic(s, mem_ref) && 441 (!_do_vector_loop || same_origin_idx(s, mem_ref))) { 442 SWPointer p2(s, this, NULL, false); 443 if (p2.comparable(align_to_ref_p)) { 444 int align = memory_alignment(s, iv_adjustment); 445 set_alignment(s, align); 446 } 447 } 448 } 449 450 // Create initial pack pairs of memory operations for which 451 // alignment is set and vectors will be aligned. 452 bool create_pack = true; 453 if (memory_alignment(mem_ref, best_iv_adjustment) == 0 || _do_vector_loop) { 454 if (!Matcher::misaligned_vectors_ok()) { 455 int vw = vector_width(mem_ref); 456 int vw_best = vector_width(best_align_to_mem_ref); 457 if (vw > vw_best) { 458 // Do not vectorize a memory access with more elements per vector 459 // if unaligned memory access is not allowed because number of 460 // iterations in pre-loop will be not enough to align it. 461 create_pack = false; 462 } else { 463 SWPointer p2(best_align_to_mem_ref, this, NULL, false); 464 if (align_to_ref_p.invar() != p2.invar()) { 465 // Do not vectorize memory accesses with different invariants 466 // if unaligned memory accesses are not allowed. 467 create_pack = false; 468 } 469 } 470 } 471 } else { 472 if (same_velt_type(mem_ref, best_align_to_mem_ref)) { 473 // Can't allow vectorization of unaligned memory accesses with the 474 // same type since it could be overlapped accesses to the same array. 475 create_pack = false; 476 } else { 477 // Allow independent (different type) unaligned memory operations 478 // if HW supports them. 479 if (!Matcher::misaligned_vectors_ok()) { 480 create_pack = false; 481 } else { 482 // Check if packs of the same memory type but 483 // with a different alignment were created before. 484 for (uint i = 0; i < align_to_refs.size(); i++) { 485 MemNode* mr = align_to_refs.at(i)->as_Mem(); 486 if (same_velt_type(mr, mem_ref) && 487 memory_alignment(mr, iv_adjustment) != 0) 488 create_pack = false; 489 } 490 } 491 } 492 } 493 if (create_pack) { 494 for (uint i = 0; i < memops.size(); i++) { 495 Node* s1 = memops.at(i); 496 int align = alignment(s1); 497 if (align == top_align) continue; 498 for (uint j = 0; j < memops.size(); j++) { 499 Node* s2 = memops.at(j); 500 if (alignment(s2) == top_align) continue; 501 if (s1 != s2 && are_adjacent_refs(s1, s2)) { 502 if (stmts_can_pack(s1, s2, align)) { 503 Node_List* pair = new Node_List(); 504 pair->push(s1); 505 pair->push(s2); 506 if (!_do_vector_loop || same_origin_idx(s1, s2)) { 507 _packset.append(pair); 508 } 509 } 510 } 511 } 512 } 513 } else { // Don't create unaligned pack 514 // First, remove remaining memory ops of the same type from the list. 515 for (int i = memops.size() - 1; i >= 0; i--) { 516 MemNode* s = memops.at(i)->as_Mem(); 517 if (same_velt_type(s, mem_ref)) { 518 memops.remove(i); 519 } 520 } 521 522 // Second, remove already constructed packs of the same type. 523 for (int i = _packset.length() - 1; i >= 0; i--) { 524 Node_List* p = _packset.at(i); 525 MemNode* s = p->at(0)->as_Mem(); 526 if (same_velt_type(s, mem_ref)) { 527 remove_pack_at(i); 528 } 529 } 530 531 // If needed find the best memory reference for loop alignment again. 532 if (same_velt_type(mem_ref, best_align_to_mem_ref)) { 533 // Put memory ops from remaining packs back on memops list for 534 // the best alignment search. 535 uint orig_msize = memops.size(); 536 for (int i = 0; i < _packset.length(); i++) { 537 Node_List* p = _packset.at(i); 538 MemNode* s = p->at(0)->as_Mem(); 539 assert(!same_velt_type(s, mem_ref), "sanity"); 540 memops.push(s); 541 } 542 MemNode* best_align_to_mem_ref = find_align_to_ref(memops); 543 if (best_align_to_mem_ref == NULL) { 544 NOT_PRODUCT(if (TraceSuperWord) tty->print_cr("SuperWord::find_adjacent_refs(): best_align_to_mem_ref == NULL");) 545 break; 546 } 547 best_iv_adjustment = get_iv_adjustment(best_align_to_mem_ref); 548 NOT_PRODUCT(find_adjacent_refs_trace_1(best_align_to_mem_ref, best_iv_adjustment);) 549 // Restore list. 550 while (memops.size() > orig_msize) 551 (void)memops.pop(); 552 } 553 } // unaligned memory accesses 554 555 // Remove used mem nodes. 556 for (int i = memops.size() - 1; i >= 0; i--) { 557 MemNode* m = memops.at(i)->as_Mem(); 558 if (alignment(m) != top_align) { 559 memops.remove(i); 560 } 561 } 562 563 } // while (memops.size() != 0 564 set_align_to_ref(best_align_to_mem_ref); 565 566 #ifndef PRODUCT 567 if (TraceSuperWord) { 568 tty->print_cr("\nAfter find_adjacent_refs"); 569 print_packset(); 570 } 571 #endif 572 } 573 574 #ifndef PRODUCT 575 void SuperWord::find_adjacent_refs_trace_1(Node* best_align_to_mem_ref, int best_iv_adjustment) { 576 if (is_trace_adjacent()) { 577 tty->print("SuperWord::find_adjacent_refs best_align_to_mem_ref = %d, best_iv_adjustment = %d", 578 best_align_to_mem_ref->_idx, best_iv_adjustment); 579 best_align_to_mem_ref->dump(); 580 } 581 } 582 #endif 583 584 //------------------------------find_align_to_ref--------------------------- 585 // Find a memory reference to align the loop induction variable to. 586 // Looks first at stores then at loads, looking for a memory reference 587 // with the largest number of references similar to it. 588 MemNode* SuperWord::find_align_to_ref(Node_List &memops) { 589 GrowableArray<int> cmp_ct(arena(), memops.size(), memops.size(), 0); 590 591 // Count number of comparable memory ops 592 for (uint i = 0; i < memops.size(); i++) { 593 MemNode* s1 = memops.at(i)->as_Mem(); 594 SWPointer p1(s1, this, NULL, false); 595 // Discard if pre loop can't align this reference 596 if (!ref_is_alignable(p1)) { 597 *cmp_ct.adr_at(i) = 0; 598 continue; 599 } 600 for (uint j = i+1; j < memops.size(); j++) { 601 MemNode* s2 = memops.at(j)->as_Mem(); 602 if (isomorphic(s1, s2)) { 603 SWPointer p2(s2, this, NULL, false); 604 if (p1.comparable(p2)) { 605 (*cmp_ct.adr_at(i))++; 606 (*cmp_ct.adr_at(j))++; 607 } 608 } 609 } 610 } 611 612 // Find Store (or Load) with the greatest number of "comparable" references, 613 // biggest vector size, smallest data size and smallest iv offset. 614 int max_ct = 0; 615 int max_vw = 0; 616 int max_idx = -1; 617 int min_size = max_jint; 618 int min_iv_offset = max_jint; 619 for (uint j = 0; j < memops.size(); j++) { 620 MemNode* s = memops.at(j)->as_Mem(); 621 if (s->is_Store()) { 622 int vw = vector_width_in_bytes(s); 623 assert(vw > 1, "sanity"); 624 SWPointer p(s, this, NULL, false); 625 if (cmp_ct.at(j) > max_ct || 626 cmp_ct.at(j) == max_ct && 627 (vw > max_vw || 628 vw == max_vw && 629 (data_size(s) < min_size || 630 data_size(s) == min_size && 631 (p.offset_in_bytes() < min_iv_offset)))) { 632 max_ct = cmp_ct.at(j); 633 max_vw = vw; 634 max_idx = j; 635 min_size = data_size(s); 636 min_iv_offset = p.offset_in_bytes(); 637 } 638 } 639 } 640 // If no stores, look at loads 641 if (max_ct == 0) { 642 for (uint j = 0; j < memops.size(); j++) { 643 MemNode* s = memops.at(j)->as_Mem(); 644 if (s->is_Load()) { 645 int vw = vector_width_in_bytes(s); 646 assert(vw > 1, "sanity"); 647 SWPointer p(s, this, NULL, false); 648 if (cmp_ct.at(j) > max_ct || 649 cmp_ct.at(j) == max_ct && 650 (vw > max_vw || 651 vw == max_vw && 652 (data_size(s) < min_size || 653 data_size(s) == min_size && 654 (p.offset_in_bytes() < min_iv_offset)))) { 655 max_ct = cmp_ct.at(j); 656 max_vw = vw; 657 max_idx = j; 658 min_size = data_size(s); 659 min_iv_offset = p.offset_in_bytes(); 660 } 661 } 662 } 663 } 664 665 #ifdef ASSERT 666 if (TraceSuperWord && Verbose) { 667 tty->print_cr("\nVector memops after find_align_to_ref"); 668 for (uint i = 0; i < memops.size(); i++) { 669 MemNode* s = memops.at(i)->as_Mem(); 670 s->dump(); 671 } 672 } 673 #endif 674 675 if (max_ct > 0) { 676 #ifdef ASSERT 677 if (TraceSuperWord) { 678 tty->print("\nVector align to node: "); 679 memops.at(max_idx)->as_Mem()->dump(); 680 } 681 #endif 682 return memops.at(max_idx)->as_Mem(); 683 } 684 return NULL; 685 } 686 687 //------------------------------ref_is_alignable--------------------------- 688 // Can the preloop align the reference to position zero in the vector? 689 bool SuperWord::ref_is_alignable(SWPointer& p) { 690 if (!p.has_iv()) { 691 return true; // no induction variable 692 } 693 CountedLoopEndNode* pre_end = get_pre_loop_end(lp()->as_CountedLoop()); 694 assert(pre_end != NULL, "we must have a correct pre-loop"); 695 assert(pre_end->stride_is_con(), "pre loop stride is constant"); 696 int preloop_stride = pre_end->stride_con(); 697 698 int span = preloop_stride * p.scale_in_bytes(); 699 int mem_size = p.memory_size(); 700 int offset = p.offset_in_bytes(); 701 // Stride one accesses are alignable if offset is aligned to memory operation size. 702 // Offset can be unaligned when UseUnalignedAccesses is used. 703 if (ABS(span) == mem_size && (ABS(offset) % mem_size) == 0) { 704 return true; 705 } 706 // If the initial offset from start of the object is computable, 707 // check if the pre-loop can align the final offset accordingly. 708 // 709 // In other words: Can we find an i such that the offset 710 // after i pre-loop iterations is aligned to vw? 711 // (init_offset + pre_loop) % vw == 0 (1) 712 // where 713 // pre_loop = i * span 714 // is the number of bytes added to the offset by i pre-loop iterations. 715 // 716 // For this to hold we need pre_loop to increase init_offset by 717 // pre_loop = vw - (init_offset % vw) 718 // 719 // This is only possible if pre_loop is divisible by span because each 720 // pre-loop iteration increases the initial offset by 'span' bytes: 721 // (vw - (init_offset % vw)) % span == 0 722 // 723 int vw = vector_width_in_bytes(p.mem()); 724 assert(vw > 1, "sanity"); 725 Node* init_nd = pre_end->init_trip(); 726 if (init_nd->is_Con() && p.invar() == NULL) { 727 int init = init_nd->bottom_type()->is_int()->get_con(); 728 int init_offset = init * p.scale_in_bytes() + offset; 729 assert(init_offset >= 0, "positive offset from object start"); 730 if (vw % span == 0) { 731 // If vm is a multiple of span, we use formula (1). 732 if (span > 0) { 733 return (vw - (init_offset % vw)) % span == 0; 734 } else { 735 assert(span < 0, "nonzero stride * scale"); 736 return (init_offset % vw) % -span == 0; 737 } 738 } else if (span % vw == 0) { 739 // If span is a multiple of vw, we can simplify formula (1) to: 740 // (init_offset + i * span) % vw == 0 741 // => 742 // (init_offset % vw) + ((i * span) % vw) == 0 743 // => 744 // init_offset % vw == 0 745 // 746 // Because we add a multiple of vw to the initial offset, the final 747 // offset is a multiple of vw if and only if init_offset is a multiple. 748 // 749 return (init_offset % vw) == 0; 750 } 751 } 752 return false; 753 } 754 755 //---------------------------get_iv_adjustment--------------------------- 756 // Calculate loop's iv adjustment for this memory ops. 757 int SuperWord::get_iv_adjustment(MemNode* mem_ref) { 758 SWPointer align_to_ref_p(mem_ref, this, NULL, false); 759 int offset = align_to_ref_p.offset_in_bytes(); 760 int scale = align_to_ref_p.scale_in_bytes(); 761 int elt_size = align_to_ref_p.memory_size(); 762 int vw = vector_width_in_bytes(mem_ref); 763 assert(vw > 1, "sanity"); 764 int iv_adjustment; 765 if (scale != 0) { 766 int stride_sign = (scale * iv_stride()) > 0 ? 1 : -1; 767 // At least one iteration is executed in pre-loop by default. As result 768 // several iterations are needed to align memory operations in main-loop even 769 // if offset is 0. 770 int iv_adjustment_in_bytes = (stride_sign * vw - (offset % vw)); 771 assert(((ABS(iv_adjustment_in_bytes) % elt_size) == 0), 772 err_msg_res("(%d) should be divisible by (%d)", iv_adjustment_in_bytes, elt_size)); 773 iv_adjustment = iv_adjustment_in_bytes/elt_size; 774 } else { 775 // This memory op is not dependent on iv (scale == 0) 776 iv_adjustment = 0; 777 } 778 779 #ifndef PRODUCT 780 if (TraceSuperWord) { 781 tty->print("SuperWord::get_iv_adjustment: n = %d, noffset = %d iv_adjust = %d elt_size = %d scale = %d iv_stride = %d vect_size %d: ", 782 mem_ref->_idx, offset, iv_adjustment, elt_size, scale, iv_stride(), vw); 783 mem_ref->dump(); 784 } 785 #endif 786 return iv_adjustment; 787 } 788 789 //---------------------------dependence_graph--------------------------- 790 // Construct dependency graph. 791 // Add dependence edges to load/store nodes for memory dependence 792 // A.out()->DependNode.in(1) and DependNode.out()->B.prec(x) 793 void SuperWord::dependence_graph() { 794 // First, assign a dependence node to each memory node 795 for (int i = 0; i < _block.length(); i++ ) { 796 Node *n = _block.at(i); 797 if (n->is_Mem() || n->is_Phi() && n->bottom_type() == Type::MEMORY) { 798 _dg.make_node(n); 799 } 800 } 801 802 // For each memory slice, create the dependences 803 for (int i = 0; i < _mem_slice_head.length(); i++) { 804 Node* n = _mem_slice_head.at(i); 805 Node* n_tail = _mem_slice_tail.at(i); 806 807 // Get slice in predecessor order (last is first) 808 mem_slice_preds(n_tail, n, _nlist); 809 810 #ifndef PRODUCT 811 if(TraceSuperWord && Verbose) { 812 tty->print_cr("SuperWord::dependence_graph: built a new mem slice"); 813 for (int j = _nlist.length() - 1; j >= 0 ; j--) { 814 _nlist.at(j)->dump(); 815 } 816 } 817 #endif 818 // Make the slice dependent on the root 819 DepMem* slice = _dg.dep(n); 820 _dg.make_edge(_dg.root(), slice); 821 822 // Create a sink for the slice 823 DepMem* slice_sink = _dg.make_node(NULL); 824 _dg.make_edge(slice_sink, _dg.tail()); 825 826 // Now visit each pair of memory ops, creating the edges 827 for (int j = _nlist.length() - 1; j >= 0 ; j--) { 828 Node* s1 = _nlist.at(j); 829 830 // If no dependency yet, use slice 831 if (_dg.dep(s1)->in_cnt() == 0) { 832 _dg.make_edge(slice, s1); 833 } 834 SWPointer p1(s1->as_Mem(), this, NULL, false); 835 bool sink_dependent = true; 836 for (int k = j - 1; k >= 0; k--) { 837 Node* s2 = _nlist.at(k); 838 if (s1->is_Load() && s2->is_Load()) 839 continue; 840 SWPointer p2(s2->as_Mem(), this, NULL, false); 841 842 int cmp = p1.cmp(p2); 843 if (SuperWordRTDepCheck && 844 p1.base() != p2.base() && p1.valid() && p2.valid()) { 845 // Create a runtime check to disambiguate 846 OrderedPair pp(p1.base(), p2.base()); 847 _disjoint_ptrs.append_if_missing(pp); 848 } else if (!SWPointer::not_equal(cmp)) { 849 // Possibly same address 850 _dg.make_edge(s1, s2); 851 sink_dependent = false; 852 } 853 } 854 if (sink_dependent) { 855 _dg.make_edge(s1, slice_sink); 856 } 857 } 858 #ifndef PRODUCT 859 if (TraceSuperWord) { 860 tty->print_cr("\nDependence graph for slice: %d", n->_idx); 861 for (int q = 0; q < _nlist.length(); q++) { 862 _dg.print(_nlist.at(q)); 863 } 864 tty->cr(); 865 } 866 #endif 867 _nlist.clear(); 868 } 869 870 #ifndef PRODUCT 871 if (TraceSuperWord) { 872 tty->print_cr("\ndisjoint_ptrs: %s", _disjoint_ptrs.length() > 0 ? "" : "NONE"); 873 for (int r = 0; r < _disjoint_ptrs.length(); r++) { 874 _disjoint_ptrs.at(r).print(); 875 tty->cr(); 876 } 877 tty->cr(); 878 } 879 #endif 880 } 881 882 //---------------------------mem_slice_preds--------------------------- 883 // Return a memory slice (node list) in predecessor order starting at "start" 884 void SuperWord::mem_slice_preds(Node* start, Node* stop, GrowableArray<Node*> &preds) { 885 assert(preds.length() == 0, "start empty"); 886 Node* n = start; 887 Node* prev = NULL; 888 while (true) { 889 NOT_PRODUCT( if(is_trace_mem_slice()) tty->print_cr("SuperWord::mem_slice_preds: n %d", n->_idx);) 890 assert(in_bb(n), "must be in block"); 891 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { 892 Node* out = n->fast_out(i); 893 if (out->is_Load()) { 894 if (in_bb(out)) { 895 preds.push(out); 896 NOT_PRODUCT(if (TraceSuperWord && Verbose) tty->print_cr("SuperWord::mem_slice_preds: added pred(%d)", out->_idx);) 897 } 898 } else { 899 // FIXME 900 if (out->is_MergeMem() && !in_bb(out)) { 901 // Either unrolling is causing a memory edge not to disappear, 902 // or need to run igvn.optimize() again before SLP 903 } else if (out->is_Phi() && out->bottom_type() == Type::MEMORY && !in_bb(out)) { 904 // Ditto. Not sure what else to check further. 905 } else if (out->Opcode() == Op_StoreCM && out->in(MemNode::OopStore) == n) { 906 // StoreCM has an input edge used as a precedence edge. 907 // Maybe an issue when oop stores are vectorized. 908 } else { 909 assert(out == prev || prev == NULL, "no branches off of store slice"); 910 } 911 }//else 912 }//for 913 if (n == stop) break; 914 preds.push(n); 915 NOT_PRODUCT(if (TraceSuperWord && Verbose) tty->print_cr("SuperWord::mem_slice_preds: added pred(%d)", n->_idx);) 916 prev = n; 917 assert(n->is_Mem(), err_msg_res("unexpected node %s", n->Name())); 918 n = n->in(MemNode::Memory); 919 } 920 } 921 922 //------------------------------stmts_can_pack--------------------------- 923 // Can s1 and s2 be in a pack with s1 immediately preceding s2 and 924 // s1 aligned at "align" 925 bool SuperWord::stmts_can_pack(Node* s1, Node* s2, int align) { 926 927 // Do not use superword for non-primitives 928 BasicType bt1 = velt_basic_type(s1); 929 BasicType bt2 = velt_basic_type(s2); 930 if(!is_java_primitive(bt1) || !is_java_primitive(bt2)) 931 return false; 932 if (Matcher::max_vector_size(bt1) < 2) { 933 return false; // No vectors for this type 934 } 935 936 if (isomorphic(s1, s2)) { 937 if (independent(s1, s2) || reduction(s1, s2)) { 938 if (!exists_at(s1, 0) && !exists_at(s2, 1)) { 939 if (!s1->is_Mem() || are_adjacent_refs(s1, s2)) { 940 int s1_align = alignment(s1); 941 int s2_align = alignment(s2); 942 if (s1_align == top_align || s1_align == align) { 943 if (s2_align == top_align || s2_align == align + data_size(s1)) { 944 return true; 945 } 946 } 947 } 948 } 949 } 950 } 951 return false; 952 } 953 954 //------------------------------exists_at--------------------------- 955 // Does s exist in a pack at position pos? 956 bool SuperWord::exists_at(Node* s, uint pos) { 957 for (int i = 0; i < _packset.length(); i++) { 958 Node_List* p = _packset.at(i); 959 if (p->at(pos) == s) { 960 return true; 961 } 962 } 963 return false; 964 } 965 966 //------------------------------are_adjacent_refs--------------------------- 967 // Is s1 immediately before s2 in memory? 968 bool SuperWord::are_adjacent_refs(Node* s1, Node* s2) { 969 if (!s1->is_Mem() || !s2->is_Mem()) return false; 970 if (!in_bb(s1) || !in_bb(s2)) return false; 971 972 // Do not use superword for non-primitives 973 if (!is_java_primitive(s1->as_Mem()->memory_type()) || 974 !is_java_primitive(s2->as_Mem()->memory_type())) { 975 return false; 976 } 977 978 // FIXME - co_locate_pack fails on Stores in different mem-slices, so 979 // only pack memops that are in the same alias set until that's fixed. 980 if (_phase->C->get_alias_index(s1->as_Mem()->adr_type()) != 981 _phase->C->get_alias_index(s2->as_Mem()->adr_type())) 982 return false; 983 SWPointer p1(s1->as_Mem(), this, NULL, false); 984 SWPointer p2(s2->as_Mem(), this, NULL, false); 985 if (p1.base() != p2.base() || !p1.comparable(p2)) return false; 986 int diff = p2.offset_in_bytes() - p1.offset_in_bytes(); 987 return diff == data_size(s1); 988 } 989 990 //------------------------------isomorphic--------------------------- 991 // Are s1 and s2 similar? 992 bool SuperWord::isomorphic(Node* s1, Node* s2) { 993 if (s1->Opcode() != s2->Opcode()) return false; 994 if (s1->req() != s2->req()) return false; 995 if (s1->in(0) != s2->in(0)) return false; 996 if (!same_velt_type(s1, s2)) return false; 997 return true; 998 } 999 1000 //------------------------------independent--------------------------- 1001 // Is there no data path from s1 to s2 or s2 to s1? 1002 bool SuperWord::independent(Node* s1, Node* s2) { 1003 // assert(s1->Opcode() == s2->Opcode(), "check isomorphic first"); 1004 int d1 = depth(s1); 1005 int d2 = depth(s2); 1006 if (d1 == d2) return s1 != s2; 1007 Node* deep = d1 > d2 ? s1 : s2; 1008 Node* shallow = d1 > d2 ? s2 : s1; 1009 1010 visited_clear(); 1011 1012 return independent_path(shallow, deep); 1013 } 1014 1015 //------------------------------reduction--------------------------- 1016 // Is there a data path between s1 and s2 and the nodes reductions? 1017 bool SuperWord::reduction(Node* s1, Node* s2) { 1018 bool retValue = false; 1019 int d1 = depth(s1); 1020 int d2 = depth(s2); 1021 if (d1 + 1 == d2) { 1022 if (s1->is_reduction() && s2->is_reduction()) { 1023 // This is an ordered set, so s1 should define s2 1024 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { 1025 Node* t1 = s1->fast_out(i); 1026 if (t1 == s2) { 1027 // both nodes are reductions and connected 1028 retValue = true; 1029 } 1030 } 1031 } 1032 } 1033 1034 return retValue; 1035 } 1036 1037 //------------------------------independent_path------------------------------ 1038 // Helper for independent 1039 bool SuperWord::independent_path(Node* shallow, Node* deep, uint dp) { 1040 if (dp >= 1000) return false; // stop deep recursion 1041 visited_set(deep); 1042 int shal_depth = depth(shallow); 1043 assert(shal_depth <= depth(deep), "must be"); 1044 for (DepPreds preds(deep, _dg); !preds.done(); preds.next()) { 1045 Node* pred = preds.current(); 1046 if (in_bb(pred) && !visited_test(pred)) { 1047 if (shallow == pred) { 1048 return false; 1049 } 1050 if (shal_depth < depth(pred) && !independent_path(shallow, pred, dp+1)) { 1051 return false; 1052 } 1053 } 1054 } 1055 return true; 1056 } 1057 1058 //------------------------------set_alignment--------------------------- 1059 void SuperWord::set_alignment(Node* s1, Node* s2, int align) { 1060 set_alignment(s1, align); 1061 if (align == top_align || align == bottom_align) { 1062 set_alignment(s2, align); 1063 } else { 1064 set_alignment(s2, align + data_size(s1)); 1065 } 1066 } 1067 1068 //------------------------------data_size--------------------------- 1069 int SuperWord::data_size(Node* s) { 1070 int bsize = type2aelembytes(velt_basic_type(s)); 1071 assert(bsize != 0, "valid size"); 1072 return bsize; 1073 } 1074 1075 //------------------------------extend_packlist--------------------------- 1076 // Extend packset by following use->def and def->use links from pack members. 1077 void SuperWord::extend_packlist() { 1078 bool changed; 1079 do { 1080 packset_sort(_packset.length()); 1081 changed = false; 1082 for (int i = 0; i < _packset.length(); i++) { 1083 Node_List* p = _packset.at(i); 1084 changed |= follow_use_defs(p); 1085 changed |= follow_def_uses(p); 1086 } 1087 } while (changed); 1088 1089 if (_race_possible) { 1090 for (int i = 0; i < _packset.length(); i++) { 1091 Node_List* p = _packset.at(i); 1092 order_def_uses(p); 1093 } 1094 } 1095 1096 #ifndef PRODUCT 1097 if (TraceSuperWord) { 1098 tty->print_cr("\nAfter extend_packlist"); 1099 print_packset(); 1100 } 1101 #endif 1102 } 1103 1104 //------------------------------follow_use_defs--------------------------- 1105 // Extend the packset by visiting operand definitions of nodes in pack p 1106 bool SuperWord::follow_use_defs(Node_List* p) { 1107 assert(p->size() == 2, "just checking"); 1108 Node* s1 = p->at(0); 1109 Node* s2 = p->at(1); 1110 assert(s1->req() == s2->req(), "just checking"); 1111 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); 1112 1113 if (s1->is_Load()) return false; 1114 1115 int align = alignment(s1); 1116 bool changed = false; 1117 int start = s1->is_Store() ? MemNode::ValueIn : 1; 1118 int end = s1->is_Store() ? MemNode::ValueIn+1 : s1->req(); 1119 for (int j = start; j < end; j++) { 1120 Node* t1 = s1->in(j); 1121 Node* t2 = s2->in(j); 1122 if (!in_bb(t1) || !in_bb(t2)) 1123 continue; 1124 if (stmts_can_pack(t1, t2, align)) { 1125 if (est_savings(t1, t2) >= 0) { 1126 Node_List* pair = new Node_List(); 1127 pair->push(t1); 1128 pair->push(t2); 1129 _packset.append(pair); 1130 set_alignment(t1, t2, align); 1131 changed = true; 1132 } 1133 } 1134 } 1135 return changed; 1136 } 1137 1138 //------------------------------follow_def_uses--------------------------- 1139 // Extend the packset by visiting uses of nodes in pack p 1140 bool SuperWord::follow_def_uses(Node_List* p) { 1141 bool changed = false; 1142 Node* s1 = p->at(0); 1143 Node* s2 = p->at(1); 1144 assert(p->size() == 2, "just checking"); 1145 assert(s1->req() == s2->req(), "just checking"); 1146 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); 1147 1148 if (s1->is_Store()) return false; 1149 1150 int align = alignment(s1); 1151 int savings = -1; 1152 int num_s1_uses = 0; 1153 Node* u1 = NULL; 1154 Node* u2 = NULL; 1155 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { 1156 Node* t1 = s1->fast_out(i); 1157 num_s1_uses++; 1158 if (!in_bb(t1)) continue; 1159 for (DUIterator_Fast jmax, j = s2->fast_outs(jmax); j < jmax; j++) { 1160 Node* t2 = s2->fast_out(j); 1161 if (!in_bb(t2)) continue; 1162 if (!opnd_positions_match(s1, t1, s2, t2)) 1163 continue; 1164 if (stmts_can_pack(t1, t2, align)) { 1165 int my_savings = est_savings(t1, t2); 1166 if (my_savings > savings) { 1167 savings = my_savings; 1168 u1 = t1; 1169 u2 = t2; 1170 } 1171 } 1172 } 1173 } 1174 if (num_s1_uses > 1) { 1175 _race_possible = true; 1176 } 1177 if (savings >= 0) { 1178 Node_List* pair = new Node_List(); 1179 pair->push(u1); 1180 pair->push(u2); 1181 _packset.append(pair); 1182 set_alignment(u1, u2, align); 1183 changed = true; 1184 } 1185 return changed; 1186 } 1187 1188 //------------------------------order_def_uses--------------------------- 1189 // For extended packsets, ordinally arrange uses packset by major component 1190 void SuperWord::order_def_uses(Node_List* p) { 1191 Node* s1 = p->at(0); 1192 1193 if (s1->is_Store()) return; 1194 1195 // reductions are always managed beforehand 1196 if (s1->is_reduction()) return; 1197 1198 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { 1199 Node* t1 = s1->fast_out(i); 1200 1201 // Only allow operand swap on commuting operations 1202 if (!t1->is_Add() && !t1->is_Mul()) { 1203 break; 1204 } 1205 1206 // Now find t1's packset 1207 Node_List* p2 = NULL; 1208 for (int j = 0; j < _packset.length(); j++) { 1209 p2 = _packset.at(j); 1210 Node* first = p2->at(0); 1211 if (t1 == first) { 1212 break; 1213 } 1214 p2 = NULL; 1215 } 1216 // Arrange all sub components by the major component 1217 if (p2 != NULL) { 1218 for (uint j = 1; j < p->size(); j++) { 1219 Node* d1 = p->at(j); 1220 Node* u1 = p2->at(j); 1221 opnd_positions_match(s1, t1, d1, u1); 1222 } 1223 } 1224 } 1225 } 1226 1227 //---------------------------opnd_positions_match------------------------- 1228 // Is the use of d1 in u1 at the same operand position as d2 in u2? 1229 bool SuperWord::opnd_positions_match(Node* d1, Node* u1, Node* d2, Node* u2) { 1230 // check reductions to see if they are marshalled to represent the reduction 1231 // operator in a specified opnd 1232 if (u1->is_reduction() && u2->is_reduction()) { 1233 // ensure reductions have phis and reduction definitions feeding the 1st operand 1234 Node* first = u1->in(2); 1235 if (first->is_Phi() || first->is_reduction()) { 1236 u1->swap_edges(1, 2); 1237 } 1238 // ensure reductions have phis and reduction definitions feeding the 1st operand 1239 first = u2->in(2); 1240 if (first->is_Phi() || first->is_reduction()) { 1241 u2->swap_edges(1, 2); 1242 } 1243 return true; 1244 } 1245 1246 uint ct = u1->req(); 1247 if (ct != u2->req()) return false; 1248 uint i1 = 0; 1249 uint i2 = 0; 1250 do { 1251 for (i1++; i1 < ct; i1++) if (u1->in(i1) == d1) break; 1252 for (i2++; i2 < ct; i2++) if (u2->in(i2) == d2) break; 1253 if (i1 != i2) { 1254 if ((i1 == (3-i2)) && (u2->is_Add() || u2->is_Mul())) { 1255 // Further analysis relies on operands position matching. 1256 u2->swap_edges(i1, i2); 1257 } else { 1258 return false; 1259 } 1260 } 1261 } while (i1 < ct); 1262 return true; 1263 } 1264 1265 //------------------------------est_savings--------------------------- 1266 // Estimate the savings from executing s1 and s2 as a pack 1267 int SuperWord::est_savings(Node* s1, Node* s2) { 1268 int save_in = 2 - 1; // 2 operations per instruction in packed form 1269 1270 // inputs 1271 for (uint i = 1; i < s1->req(); i++) { 1272 Node* x1 = s1->in(i); 1273 Node* x2 = s2->in(i); 1274 if (x1 != x2) { 1275 if (are_adjacent_refs(x1, x2)) { 1276 save_in += adjacent_profit(x1, x2); 1277 } else if (!in_packset(x1, x2)) { 1278 save_in -= pack_cost(2); 1279 } else { 1280 save_in += unpack_cost(2); 1281 } 1282 } 1283 } 1284 1285 // uses of result 1286 uint ct = 0; 1287 int save_use = 0; 1288 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { 1289 Node* s1_use = s1->fast_out(i); 1290 for (int j = 0; j < _packset.length(); j++) { 1291 Node_List* p = _packset.at(j); 1292 if (p->at(0) == s1_use) { 1293 for (DUIterator_Fast kmax, k = s2->fast_outs(kmax); k < kmax; k++) { 1294 Node* s2_use = s2->fast_out(k); 1295 if (p->at(p->size()-1) == s2_use) { 1296 ct++; 1297 if (are_adjacent_refs(s1_use, s2_use)) { 1298 save_use += adjacent_profit(s1_use, s2_use); 1299 } 1300 } 1301 } 1302 } 1303 } 1304 } 1305 1306 if (ct < s1->outcnt()) save_use += unpack_cost(1); 1307 if (ct < s2->outcnt()) save_use += unpack_cost(1); 1308 1309 return MAX2(save_in, save_use); 1310 } 1311 1312 //------------------------------costs--------------------------- 1313 int SuperWord::adjacent_profit(Node* s1, Node* s2) { return 2; } 1314 int SuperWord::pack_cost(int ct) { return ct; } 1315 int SuperWord::unpack_cost(int ct) { return ct; } 1316 1317 //------------------------------combine_packs--------------------------- 1318 // Combine packs A and B with A.last == B.first into A.first..,A.last,B.second,..B.last 1319 void SuperWord::combine_packs() { 1320 bool changed = true; 1321 // Combine packs regardless max vector size. 1322 while (changed) { 1323 changed = false; 1324 for (int i = 0; i < _packset.length(); i++) { 1325 Node_List* p1 = _packset.at(i); 1326 if (p1 == NULL) continue; 1327 // Because of sorting we can start at i + 1 1328 for (int j = i + 1; j < _packset.length(); j++) { 1329 Node_List* p2 = _packset.at(j); 1330 if (p2 == NULL) continue; 1331 if (i == j) continue; 1332 if (p1->at(p1->size()-1) == p2->at(0)) { 1333 for (uint k = 1; k < p2->size(); k++) { 1334 p1->push(p2->at(k)); 1335 } 1336 _packset.at_put(j, NULL); 1337 changed = true; 1338 } 1339 } 1340 } 1341 } 1342 1343 // Split packs which have size greater then max vector size. 1344 for (int i = 0; i < _packset.length(); i++) { 1345 Node_List* p1 = _packset.at(i); 1346 if (p1 != NULL) { 1347 BasicType bt = velt_basic_type(p1->at(0)); 1348 uint max_vlen = Matcher::max_vector_size(bt); // Max elements in vector 1349 assert(is_power_of_2(max_vlen), "sanity"); 1350 uint psize = p1->size(); 1351 if (!is_power_of_2(psize)) { 1352 // Skip pack which can't be vector. 1353 // case1: for(...) { a[i] = i; } elements values are different (i+x) 1354 // case2: for(...) { a[i] = b[i+1]; } can't align both, load and store 1355 _packset.at_put(i, NULL); 1356 continue; 1357 } 1358 if (psize > max_vlen) { 1359 Node_List* pack = new Node_List(); 1360 for (uint j = 0; j < psize; j++) { 1361 pack->push(p1->at(j)); 1362 if (pack->size() >= max_vlen) { 1363 assert(is_power_of_2(pack->size()), "sanity"); 1364 _packset.append(pack); 1365 pack = new Node_List(); 1366 } 1367 } 1368 _packset.at_put(i, NULL); 1369 } 1370 } 1371 } 1372 1373 // Compress list. 1374 for (int i = _packset.length() - 1; i >= 0; i--) { 1375 Node_List* p1 = _packset.at(i); 1376 if (p1 == NULL) { 1377 _packset.remove_at(i); 1378 } 1379 } 1380 1381 #ifndef PRODUCT 1382 if (TraceSuperWord) { 1383 tty->print_cr("\nAfter combine_packs"); 1384 print_packset(); 1385 } 1386 #endif 1387 } 1388 1389 //-----------------------------construct_my_pack_map-------------------------- 1390 // Construct the map from nodes to packs. Only valid after the 1391 // point where a node is only in one pack (after combine_packs). 1392 void SuperWord::construct_my_pack_map() { 1393 Node_List* rslt = NULL; 1394 for (int i = 0; i < _packset.length(); i++) { 1395 Node_List* p = _packset.at(i); 1396 for (uint j = 0; j < p->size(); j++) { 1397 Node* s = p->at(j); 1398 assert(my_pack(s) == NULL, "only in one pack"); 1399 set_my_pack(s, p); 1400 } 1401 } 1402 } 1403 1404 //------------------------------filter_packs--------------------------- 1405 // Remove packs that are not implemented or not profitable. 1406 void SuperWord::filter_packs() { 1407 // Remove packs that are not implemented 1408 for (int i = _packset.length() - 1; i >= 0; i--) { 1409 Node_List* pk = _packset.at(i); 1410 bool impl = implemented(pk); 1411 if (!impl) { 1412 #ifndef PRODUCT 1413 if (TraceSuperWord && Verbose) { 1414 tty->print_cr("Unimplemented"); 1415 pk->at(0)->dump(); 1416 } 1417 #endif 1418 remove_pack_at(i); 1419 } 1420 Node *n = pk->at(0); 1421 if (n->is_reduction()) { 1422 _num_reductions++; 1423 } else { 1424 _num_work_vecs++; 1425 } 1426 } 1427 1428 // Remove packs that are not profitable 1429 bool changed; 1430 do { 1431 changed = false; 1432 for (int i = _packset.length() - 1; i >= 0; i--) { 1433 Node_List* pk = _packset.at(i); 1434 bool prof = profitable(pk); 1435 if (!prof) { 1436 #ifndef PRODUCT 1437 if (TraceSuperWord && Verbose) { 1438 tty->print_cr("Unprofitable"); 1439 pk->at(0)->dump(); 1440 } 1441 #endif 1442 remove_pack_at(i); 1443 changed = true; 1444 } 1445 } 1446 } while (changed); 1447 1448 #ifndef PRODUCT 1449 if (TraceSuperWord) { 1450 tty->print_cr("\nAfter filter_packs"); 1451 print_packset(); 1452 tty->cr(); 1453 } 1454 #endif 1455 } 1456 1457 //------------------------------implemented--------------------------- 1458 // Can code be generated for pack p? 1459 bool SuperWord::implemented(Node_List* p) { 1460 bool retValue = false; 1461 Node* p0 = p->at(0); 1462 if (p0 != NULL) { 1463 int opc = p0->Opcode(); 1464 uint size = p->size(); 1465 if (p0->is_reduction()) { 1466 const Type *arith_type = p0->bottom_type(); 1467 // Length 2 reductions of INT/LONG do not offer performance benefits 1468 if (((arith_type->basic_type() == T_INT) || (arith_type->basic_type() == T_LONG)) && (size == 2)) { 1469 retValue = false; 1470 } else { 1471 retValue = ReductionNode::implemented(opc, size, arith_type->basic_type()); 1472 } 1473 } else { 1474 retValue = VectorNode::implemented(opc, size, velt_basic_type(p0)); 1475 } 1476 } 1477 return retValue; 1478 } 1479 1480 //------------------------------same_inputs-------------------------- 1481 // For pack p, are all idx operands the same? 1482 static bool same_inputs(Node_List* p, int idx) { 1483 Node* p0 = p->at(0); 1484 uint vlen = p->size(); 1485 Node* p0_def = p0->in(idx); 1486 for (uint i = 1; i < vlen; i++) { 1487 Node* pi = p->at(i); 1488 Node* pi_def = pi->in(idx); 1489 if (p0_def != pi_def) 1490 return false; 1491 } 1492 return true; 1493 } 1494 1495 //------------------------------profitable--------------------------- 1496 // For pack p, are all operands and all uses (with in the block) vector? 1497 bool SuperWord::profitable(Node_List* p) { 1498 Node* p0 = p->at(0); 1499 uint start, end; 1500 VectorNode::vector_operands(p0, &start, &end); 1501 1502 // Return false if some inputs are not vectors or vectors with different 1503 // size or alignment. 1504 // Also, for now, return false if not scalar promotion case when inputs are 1505 // the same. Later, implement PackNode and allow differing, non-vector inputs 1506 // (maybe just the ones from outside the block.) 1507 for (uint i = start; i < end; i++) { 1508 if (!is_vector_use(p0, i)) 1509 return false; 1510 } 1511 // Check if reductions are connected 1512 if (p0->is_reduction()) { 1513 Node* second_in = p0->in(2); 1514 Node_List* second_pk = my_pack(second_in); 1515 if ((second_pk == NULL) || (_num_work_vecs == _num_reductions)) { 1516 // Remove reduction flag if no parent pack or if not enough work 1517 // to cover reduction expansion overhead 1518 p0->remove_flag(Node::Flag_is_reduction); 1519 return false; 1520 } else if (second_pk->size() != p->size()) { 1521 return false; 1522 } 1523 } 1524 if (VectorNode::is_shift(p0)) { 1525 // For now, return false if shift count is vector or not scalar promotion 1526 // case (different shift counts) because it is not supported yet. 1527 Node* cnt = p0->in(2); 1528 Node_List* cnt_pk = my_pack(cnt); 1529 if (cnt_pk != NULL) 1530 return false; 1531 if (!same_inputs(p, 2)) 1532 return false; 1533 } 1534 if (!p0->is_Store()) { 1535 // For now, return false if not all uses are vector. 1536 // Later, implement ExtractNode and allow non-vector uses (maybe 1537 // just the ones outside the block.) 1538 for (uint i = 0; i < p->size(); i++) { 1539 Node* def = p->at(i); 1540 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { 1541 Node* use = def->fast_out(j); 1542 for (uint k = 0; k < use->req(); k++) { 1543 Node* n = use->in(k); 1544 if (def == n) { 1545 // reductions can be loop carried dependences 1546 if (def->is_reduction() && use->is_Phi()) 1547 continue; 1548 if (!is_vector_use(use, k)) { 1549 return false; 1550 } 1551 } 1552 } 1553 } 1554 } 1555 } 1556 return true; 1557 } 1558 1559 //------------------------------schedule--------------------------- 1560 // Adjust the memory graph for the packed operations 1561 void SuperWord::schedule() { 1562 1563 // Co-locate in the memory graph the members of each memory pack 1564 for (int i = 0; i < _packset.length(); i++) { 1565 co_locate_pack(_packset.at(i)); 1566 } 1567 } 1568 1569 //-------------------------------remove_and_insert------------------- 1570 // Remove "current" from its current position in the memory graph and insert 1571 // it after the appropriate insertion point (lip or uip). 1572 void SuperWord::remove_and_insert(MemNode *current, MemNode *prev, MemNode *lip, 1573 Node *uip, Unique_Node_List &sched_before) { 1574 Node* my_mem = current->in(MemNode::Memory); 1575 bool sched_up = sched_before.member(current); 1576 1577 // remove current_store from its current position in the memmory graph 1578 for (DUIterator i = current->outs(); current->has_out(i); i++) { 1579 Node* use = current->out(i); 1580 if (use->is_Mem()) { 1581 assert(use->in(MemNode::Memory) == current, "must be"); 1582 if (use == prev) { // connect prev to my_mem 1583 _igvn.replace_input_of(use, MemNode::Memory, my_mem); 1584 --i; //deleted this edge; rescan position 1585 } else if (sched_before.member(use)) { 1586 if (!sched_up) { // Will be moved together with current 1587 _igvn.replace_input_of(use, MemNode::Memory, uip); 1588 --i; //deleted this edge; rescan position 1589 } 1590 } else { 1591 if (sched_up) { // Will be moved together with current 1592 _igvn.replace_input_of(use, MemNode::Memory, lip); 1593 --i; //deleted this edge; rescan position 1594 } 1595 } 1596 } 1597 } 1598 1599 Node *insert_pt = sched_up ? uip : lip; 1600 1601 // all uses of insert_pt's memory state should use current's instead 1602 for (DUIterator i = insert_pt->outs(); insert_pt->has_out(i); i++) { 1603 Node* use = insert_pt->out(i); 1604 if (use->is_Mem()) { 1605 assert(use->in(MemNode::Memory) == insert_pt, "must be"); 1606 _igvn.replace_input_of(use, MemNode::Memory, current); 1607 --i; //deleted this edge; rescan position 1608 } else if (!sched_up && use->is_Phi() && use->bottom_type() == Type::MEMORY) { 1609 uint pos; //lip (lower insert point) must be the last one in the memory slice 1610 for (pos=1; pos < use->req(); pos++) { 1611 if (use->in(pos) == insert_pt) break; 1612 } 1613 _igvn.replace_input_of(use, pos, current); 1614 --i; 1615 } 1616 } 1617 1618 //connect current to insert_pt 1619 _igvn.replace_input_of(current, MemNode::Memory, insert_pt); 1620 } 1621 1622 //------------------------------co_locate_pack---------------------------------- 1623 // To schedule a store pack, we need to move any sandwiched memory ops either before 1624 // or after the pack, based upon dependence information: 1625 // (1) If any store in the pack depends on the sandwiched memory op, the 1626 // sandwiched memory op must be scheduled BEFORE the pack; 1627 // (2) If a sandwiched memory op depends on any store in the pack, the 1628 // sandwiched memory op must be scheduled AFTER the pack; 1629 // (3) If a sandwiched memory op (say, memA) depends on another sandwiched 1630 // memory op (say memB), memB must be scheduled before memA. So, if memA is 1631 // scheduled before the pack, memB must also be scheduled before the pack; 1632 // (4) If there is no dependence restriction for a sandwiched memory op, we simply 1633 // schedule this store AFTER the pack 1634 // (5) We know there is no dependence cycle, so there in no other case; 1635 // (6) Finally, all memory ops in another single pack should be moved in the same direction. 1636 // 1637 // To schedule a load pack, we use the memory state of either the first or the last load in 1638 // the pack, based on the dependence constraint. 1639 void SuperWord::co_locate_pack(Node_List* pk) { 1640 if (pk->at(0)->is_Store()) { 1641 MemNode* first = executed_first(pk)->as_Mem(); 1642 MemNode* last = executed_last(pk)->as_Mem(); 1643 Unique_Node_List schedule_before_pack; 1644 Unique_Node_List memops; 1645 1646 MemNode* current = last->in(MemNode::Memory)->as_Mem(); 1647 MemNode* previous = last; 1648 while (true) { 1649 assert(in_bb(current), "stay in block"); 1650 memops.push(previous); 1651 for (DUIterator i = current->outs(); current->has_out(i); i++) { 1652 Node* use = current->out(i); 1653 if (use->is_Mem() && use != previous) 1654 memops.push(use); 1655 } 1656 if (current == first) break; 1657 previous = current; 1658 current = current->in(MemNode::Memory)->as_Mem(); 1659 } 1660 1661 // determine which memory operations should be scheduled before the pack 1662 for (uint i = 1; i < memops.size(); i++) { 1663 Node *s1 = memops.at(i); 1664 if (!in_pack(s1, pk) && !schedule_before_pack.member(s1)) { 1665 for (uint j = 0; j< i; j++) { 1666 Node *s2 = memops.at(j); 1667 if (!independent(s1, s2)) { 1668 if (in_pack(s2, pk) || schedule_before_pack.member(s2)) { 1669 schedule_before_pack.push(s1); // s1 must be scheduled before 1670 Node_List* mem_pk = my_pack(s1); 1671 if (mem_pk != NULL) { 1672 for (uint ii = 0; ii < mem_pk->size(); ii++) { 1673 Node* s = mem_pk->at(ii); // follow partner 1674 if (memops.member(s) && !schedule_before_pack.member(s)) 1675 schedule_before_pack.push(s); 1676 } 1677 } 1678 break; 1679 } 1680 } 1681 } 1682 } 1683 } 1684 1685 Node* upper_insert_pt = first->in(MemNode::Memory); 1686 // Following code moves loads connected to upper_insert_pt below aliased stores. 1687 // Collect such loads here and reconnect them back to upper_insert_pt later. 1688 memops.clear(); 1689 for (DUIterator i = upper_insert_pt->outs(); upper_insert_pt->has_out(i); i++) { 1690 Node* use = upper_insert_pt->out(i); 1691 if (use->is_Mem() && !use->is_Store()) { 1692 memops.push(use); 1693 } 1694 } 1695 1696 MemNode* lower_insert_pt = last; 1697 previous = last; //previous store in pk 1698 current = last->in(MemNode::Memory)->as_Mem(); 1699 1700 // start scheduling from "last" to "first" 1701 while (true) { 1702 assert(in_bb(current), "stay in block"); 1703 assert(in_pack(previous, pk), "previous stays in pack"); 1704 Node* my_mem = current->in(MemNode::Memory); 1705 1706 if (in_pack(current, pk)) { 1707 // Forward users of my memory state (except "previous) to my input memory state 1708 for (DUIterator i = current->outs(); current->has_out(i); i++) { 1709 Node* use = current->out(i); 1710 if (use->is_Mem() && use != previous) { 1711 assert(use->in(MemNode::Memory) == current, "must be"); 1712 if (schedule_before_pack.member(use)) { 1713 _igvn.replace_input_of(use, MemNode::Memory, upper_insert_pt); 1714 } else { 1715 _igvn.replace_input_of(use, MemNode::Memory, lower_insert_pt); 1716 } 1717 --i; // deleted this edge; rescan position 1718 } 1719 } 1720 previous = current; 1721 } else { // !in_pack(current, pk) ==> a sandwiched store 1722 remove_and_insert(current, previous, lower_insert_pt, upper_insert_pt, schedule_before_pack); 1723 } 1724 1725 if (current == first) break; 1726 current = my_mem->as_Mem(); 1727 } // end while 1728 1729 // Reconnect loads back to upper_insert_pt. 1730 for (uint i = 0; i < memops.size(); i++) { 1731 Node *ld = memops.at(i); 1732 if (ld->in(MemNode::Memory) != upper_insert_pt) { 1733 _igvn.replace_input_of(ld, MemNode::Memory, upper_insert_pt); 1734 } 1735 } 1736 } else if (pk->at(0)->is_Load()) { //load 1737 // all loads in the pack should have the same memory state. By default, 1738 // we use the memory state of the last load. However, if any load could 1739 // not be moved down due to the dependence constraint, we use the memory 1740 // state of the first load. 1741 Node* last_mem = executed_last(pk)->in(MemNode::Memory); 1742 Node* first_mem = executed_first(pk)->in(MemNode::Memory); 1743 bool schedule_last = true; 1744 for (uint i = 0; i < pk->size(); i++) { 1745 Node* ld = pk->at(i); 1746 for (Node* current = last_mem; current != ld->in(MemNode::Memory); 1747 current=current->in(MemNode::Memory)) { 1748 assert(current != first_mem, "corrupted memory graph"); 1749 if(current->is_Mem() && !independent(current, ld)){ 1750 schedule_last = false; // a later store depends on this load 1751 break; 1752 } 1753 } 1754 } 1755 1756 Node* mem_input = schedule_last ? last_mem : first_mem; 1757 _igvn.hash_delete(mem_input); 1758 // Give each load the same memory state 1759 for (uint i = 0; i < pk->size(); i++) { 1760 LoadNode* ld = pk->at(i)->as_Load(); 1761 _igvn.replace_input_of(ld, MemNode::Memory, mem_input); 1762 } 1763 } 1764 } 1765 1766 //------------------------------output--------------------------- 1767 // Convert packs into vector node operations 1768 void SuperWord::output() { 1769 if (_packset.length() == 0) return; 1770 1771 #ifndef PRODUCT 1772 if (TraceLoopOpts) { 1773 tty->print("SuperWord "); 1774 lpt()->dump_head(); 1775 } 1776 #endif 1777 1778 // MUST ENSURE main loop's initial value is properly aligned: 1779 // (iv_initial_value + min_iv_offset) % vector_width_in_bytes() == 0 1780 1781 align_initial_loop_index(align_to_ref()); 1782 1783 // Insert extract (unpack) operations for scalar uses 1784 for (int i = 0; i < _packset.length(); i++) { 1785 insert_extracts(_packset.at(i)); 1786 } 1787 1788 Compile* C = _phase->C; 1789 CountedLoopNode *cl = lpt()->_head->as_CountedLoop(); 1790 uint max_vlen_in_bytes = 0; 1791 uint max_vlen = 0; 1792 for (int i = 0; i < _block.length(); i++) { 1793 Node* n = _block.at(i); 1794 Node_List* p = my_pack(n); 1795 if (p && n == executed_last(p)) { 1796 uint vlen = p->size(); 1797 uint vlen_in_bytes = 0; 1798 Node* vn = NULL; 1799 Node* low_adr = p->at(0); 1800 Node* first = executed_first(p); 1801 int opc = n->Opcode(); 1802 if (n->is_Load()) { 1803 Node* ctl = n->in(MemNode::Control); 1804 Node* mem = first->in(MemNode::Memory); 1805 SWPointer p1(n->as_Mem(), this, NULL, false); 1806 // Identify the memory dependency for the new loadVector node by 1807 // walking up through memory chain. 1808 // This is done to give flexibility to the new loadVector node so that 1809 // it can move above independent storeVector nodes. 1810 while (mem->is_StoreVector()) { 1811 SWPointer p2(mem->as_Mem(), this, NULL, false); 1812 int cmp = p1.cmp(p2); 1813 if (SWPointer::not_equal(cmp) || !SWPointer::comparable(cmp)) { 1814 mem = mem->in(MemNode::Memory); 1815 } else { 1816 break; // dependent memory 1817 } 1818 } 1819 Node* adr = low_adr->in(MemNode::Address); 1820 const TypePtr* atyp = n->adr_type(); 1821 vn = LoadVectorNode::make(opc, ctl, mem, adr, atyp, vlen, velt_basic_type(n), control_dependency(p)); 1822 vlen_in_bytes = vn->as_LoadVector()->memory_size(); 1823 } else if (n->is_Store()) { 1824 // Promote value to be stored to vector 1825 Node* val = vector_opd(p, MemNode::ValueIn); 1826 Node* ctl = n->in(MemNode::Control); 1827 Node* mem = first->in(MemNode::Memory); 1828 Node* adr = low_adr->in(MemNode::Address); 1829 const TypePtr* atyp = n->adr_type(); 1830 vn = StoreVectorNode::make(opc, ctl, mem, adr, atyp, val, vlen); 1831 vlen_in_bytes = vn->as_StoreVector()->memory_size(); 1832 } else if (n->req() == 3) { 1833 // Promote operands to vector 1834 Node* in1 = NULL; 1835 bool node_isa_reduction = n->is_reduction(); 1836 if (node_isa_reduction) { 1837 // the input to the first reduction operation is retained 1838 in1 = low_adr->in(1); 1839 } else { 1840 in1 = vector_opd(p, 1); 1841 } 1842 Node* in2 = vector_opd(p, 2); 1843 if (VectorNode::is_invariant_vector(in1) && (node_isa_reduction == false) && (n->is_Add() || n->is_Mul())) { 1844 // Move invariant vector input into second position to avoid register spilling. 1845 Node* tmp = in1; 1846 in1 = in2; 1847 in2 = tmp; 1848 } 1849 if (node_isa_reduction) { 1850 const Type *arith_type = n->bottom_type(); 1851 vn = ReductionNode::make(opc, NULL, in1, in2, arith_type->basic_type()); 1852 if (in2->is_Load()) { 1853 vlen_in_bytes = in2->as_LoadVector()->memory_size(); 1854 } else { 1855 vlen_in_bytes = in2->as_Vector()->length_in_bytes(); 1856 } 1857 } else { 1858 vn = VectorNode::make(opc, in1, in2, vlen, velt_basic_type(n)); 1859 vlen_in_bytes = vn->as_Vector()->length_in_bytes(); 1860 } 1861 } else if (opc == Op_SqrtD) { 1862 // Promote operand to vector (Sqrt is a 2 address instruction) 1863 Node* in = vector_opd(p, 1); 1864 vn = VectorNode::make(opc, in, NULL, vlen, velt_basic_type(n)); 1865 vlen_in_bytes = vn->as_Vector()->length_in_bytes(); 1866 } else { 1867 ShouldNotReachHere(); 1868 } 1869 assert(vn != NULL, "sanity"); 1870 _igvn.register_new_node_with_optimizer(vn); 1871 _phase->set_ctrl(vn, _phase->get_ctrl(p->at(0))); 1872 for (uint j = 0; j < p->size(); j++) { 1873 Node* pm = p->at(j); 1874 _igvn.replace_node(pm, vn); 1875 } 1876 _igvn._worklist.push(vn); 1877 1878 if (vlen_in_bytes > max_vlen_in_bytes) { 1879 max_vlen = vlen; 1880 max_vlen_in_bytes = vlen_in_bytes; 1881 } 1882 #ifdef ASSERT 1883 if (TraceNewVectors) { 1884 tty->print("new Vector node: "); 1885 vn->dump(); 1886 } 1887 #endif 1888 } 1889 } 1890 C->set_max_vector_size(max_vlen_in_bytes); 1891 if (SuperWordLoopUnrollAnalysis) { 1892 if (cl->has_passed_slp()) { 1893 uint slp_max_unroll_factor = cl->slp_max_unroll(); 1894 if (slp_max_unroll_factor == max_vlen) { 1895 NOT_PRODUCT(if (TraceSuperWordLoopUnrollAnalysis) tty->print_cr("vector loop(unroll=%d, len=%d)\n", max_vlen, max_vlen_in_bytes*BitsPerByte)); 1896 // For atomic unrolled loops which are vector mapped, instigate more unrolling. 1897 cl->set_notpassed_slp(); 1898 C->set_major_progress(); 1899 cl->mark_do_unroll_only(); 1900 } 1901 } 1902 } 1903 } 1904 1905 //------------------------------vector_opd--------------------------- 1906 // Create a vector operand for the nodes in pack p for operand: in(opd_idx) 1907 Node* SuperWord::vector_opd(Node_List* p, int opd_idx) { 1908 Node* p0 = p->at(0); 1909 uint vlen = p->size(); 1910 Node* opd = p0->in(opd_idx); 1911 1912 if (same_inputs(p, opd_idx)) { 1913 if (opd->is_Vector() || opd->is_LoadVector()) { 1914 assert(((opd_idx != 2) || !VectorNode::is_shift(p0)), "shift's count can't be vector"); 1915 return opd; // input is matching vector 1916 } 1917 if ((opd_idx == 2) && VectorNode::is_shift(p0)) { 1918 Compile* C = _phase->C; 1919 Node* cnt = opd; 1920 // Vector instructions do not mask shift count, do it here. 1921 juint mask = (p0->bottom_type() == TypeInt::INT) ? (BitsPerInt - 1) : (BitsPerLong - 1); 1922 const TypeInt* t = opd->find_int_type(); 1923 if (t != NULL && t->is_con()) { 1924 juint shift = t->get_con(); 1925 if (shift > mask) { // Unsigned cmp 1926 cnt = ConNode::make(TypeInt::make(shift & mask)); 1927 } 1928 } else { 1929 if (t == NULL || t->_lo < 0 || t->_hi > (int)mask) { 1930 cnt = ConNode::make(TypeInt::make(mask)); 1931 _igvn.register_new_node_with_optimizer(cnt); 1932 cnt = new AndINode(opd, cnt); 1933 _igvn.register_new_node_with_optimizer(cnt); 1934 _phase->set_ctrl(cnt, _phase->get_ctrl(opd)); 1935 } 1936 assert(opd->bottom_type()->isa_int(), "int type only"); 1937 // Move non constant shift count into vector register. 1938 cnt = VectorNode::shift_count(p0, cnt, vlen, velt_basic_type(p0)); 1939 } 1940 if (cnt != opd) { 1941 _igvn.register_new_node_with_optimizer(cnt); 1942 _phase->set_ctrl(cnt, _phase->get_ctrl(opd)); 1943 } 1944 return cnt; 1945 } 1946 assert(!opd->is_StoreVector(), "such vector is not expected here"); 1947 // Convert scalar input to vector with the same number of elements as 1948 // p0's vector. Use p0's type because size of operand's container in 1949 // vector should match p0's size regardless operand's size. 1950 const Type* p0_t = velt_type(p0); 1951 VectorNode* vn = VectorNode::scalar2vector(opd, vlen, p0_t); 1952 1953 _igvn.register_new_node_with_optimizer(vn); 1954 _phase->set_ctrl(vn, _phase->get_ctrl(opd)); 1955 #ifdef ASSERT 1956 if (TraceNewVectors) { 1957 tty->print("new Vector node: "); 1958 vn->dump(); 1959 } 1960 #endif 1961 return vn; 1962 } 1963 1964 // Insert pack operation 1965 BasicType bt = velt_basic_type(p0); 1966 PackNode* pk = PackNode::make(opd, vlen, bt); 1967 DEBUG_ONLY( const BasicType opd_bt = opd->bottom_type()->basic_type(); ) 1968 1969 for (uint i = 1; i < vlen; i++) { 1970 Node* pi = p->at(i); 1971 Node* in = pi->in(opd_idx); 1972 assert(my_pack(in) == NULL, "Should already have been unpacked"); 1973 assert(opd_bt == in->bottom_type()->basic_type(), "all same type"); 1974 pk->add_opd(in); 1975 } 1976 _igvn.register_new_node_with_optimizer(pk); 1977 _phase->set_ctrl(pk, _phase->get_ctrl(opd)); 1978 #ifdef ASSERT 1979 if (TraceNewVectors) { 1980 tty->print("new Vector node: "); 1981 pk->dump(); 1982 } 1983 #endif 1984 return pk; 1985 } 1986 1987 //------------------------------insert_extracts--------------------------- 1988 // If a use of pack p is not a vector use, then replace the 1989 // use with an extract operation. 1990 void SuperWord::insert_extracts(Node_List* p) { 1991 if (p->at(0)->is_Store()) return; 1992 assert(_n_idx_list.is_empty(), "empty (node,index) list"); 1993 1994 // Inspect each use of each pack member. For each use that is 1995 // not a vector use, replace the use with an extract operation. 1996 1997 for (uint i = 0; i < p->size(); i++) { 1998 Node* def = p->at(i); 1999 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { 2000 Node* use = def->fast_out(j); 2001 for (uint k = 0; k < use->req(); k++) { 2002 Node* n = use->in(k); 2003 if (def == n) { 2004 if (!is_vector_use(use, k)) { 2005 _n_idx_list.push(use, k); 2006 } 2007 } 2008 } 2009 } 2010 } 2011 2012 while (_n_idx_list.is_nonempty()) { 2013 Node* use = _n_idx_list.node(); 2014 int idx = _n_idx_list.index(); 2015 _n_idx_list.pop(); 2016 Node* def = use->in(idx); 2017 2018 if (def->is_reduction()) continue; 2019 2020 // Insert extract operation 2021 _igvn.hash_delete(def); 2022 int def_pos = alignment(def) / data_size(def); 2023 2024 Node* ex = ExtractNode::make(def, def_pos, velt_basic_type(def)); 2025 _igvn.register_new_node_with_optimizer(ex); 2026 _phase->set_ctrl(ex, _phase->get_ctrl(def)); 2027 _igvn.replace_input_of(use, idx, ex); 2028 _igvn._worklist.push(def); 2029 2030 bb_insert_after(ex, bb_idx(def)); 2031 set_velt_type(ex, velt_type(def)); 2032 } 2033 } 2034 2035 //------------------------------is_vector_use--------------------------- 2036 // Is use->in(u_idx) a vector use? 2037 bool SuperWord::is_vector_use(Node* use, int u_idx) { 2038 Node_List* u_pk = my_pack(use); 2039 if (u_pk == NULL) return false; 2040 if (use->is_reduction()) return true; 2041 Node* def = use->in(u_idx); 2042 Node_List* d_pk = my_pack(def); 2043 if (d_pk == NULL) { 2044 // check for scalar promotion 2045 Node* n = u_pk->at(0)->in(u_idx); 2046 for (uint i = 1; i < u_pk->size(); i++) { 2047 if (u_pk->at(i)->in(u_idx) != n) return false; 2048 } 2049 return true; 2050 } 2051 if (u_pk->size() != d_pk->size()) 2052 return false; 2053 for (uint i = 0; i < u_pk->size(); i++) { 2054 Node* ui = u_pk->at(i); 2055 Node* di = d_pk->at(i); 2056 if (ui->in(u_idx) != di || alignment(ui) != alignment(di)) 2057 return false; 2058 } 2059 return true; 2060 } 2061 2062 //------------------------------construct_bb--------------------------- 2063 // Construct reverse postorder list of block members 2064 bool SuperWord::construct_bb() { 2065 Node* entry = bb(); 2066 2067 assert(_stk.length() == 0, "stk is empty"); 2068 assert(_block.length() == 0, "block is empty"); 2069 assert(_data_entry.length() == 0, "data_entry is empty"); 2070 assert(_mem_slice_head.length() == 0, "mem_slice_head is empty"); 2071 assert(_mem_slice_tail.length() == 0, "mem_slice_tail is empty"); 2072 2073 // Find non-control nodes with no inputs from within block, 2074 // create a temporary map from node _idx to bb_idx for use 2075 // by the visited and post_visited sets, 2076 // and count number of nodes in block. 2077 int bb_ct = 0; 2078 for (uint i = 0; i < lpt()->_body.size(); i++) { 2079 Node *n = lpt()->_body.at(i); 2080 set_bb_idx(n, i); // Create a temporary map 2081 if (in_bb(n)) { 2082 if (n->is_LoadStore() || n->is_MergeMem() || 2083 (n->is_Proj() && !n->as_Proj()->is_CFG())) { 2084 // Bailout if the loop has LoadStore, MergeMem or data Proj 2085 // nodes. Superword optimization does not work with them. 2086 return false; 2087 } 2088 bb_ct++; 2089 if (!n->is_CFG()) { 2090 bool found = false; 2091 for (uint j = 0; j < n->req(); j++) { 2092 Node* def = n->in(j); 2093 if (def && in_bb(def)) { 2094 found = true; 2095 break; 2096 } 2097 } 2098 if (!found) { 2099 assert(n != entry, "can't be entry"); 2100 _data_entry.push(n); 2101 } 2102 } 2103 } 2104 } 2105 2106 // Find memory slices (head and tail) 2107 for (DUIterator_Fast imax, i = lp()->fast_outs(imax); i < imax; i++) { 2108 Node *n = lp()->fast_out(i); 2109 if (in_bb(n) && (n->is_Phi() && n->bottom_type() == Type::MEMORY)) { 2110 Node* n_tail = n->in(LoopNode::LoopBackControl); 2111 if (n_tail != n->in(LoopNode::EntryControl)) { 2112 if (!n_tail->is_Mem()) { 2113 assert(n_tail->is_Mem(), err_msg_res("unexpected node for memory slice: %s", n_tail->Name())); 2114 return false; // Bailout 2115 } 2116 _mem_slice_head.push(n); 2117 _mem_slice_tail.push(n_tail); 2118 } 2119 } 2120 } 2121 2122 // Create an RPO list of nodes in block 2123 2124 visited_clear(); 2125 post_visited_clear(); 2126 2127 // Push all non-control nodes with no inputs from within block, then control entry 2128 for (int j = 0; j < _data_entry.length(); j++) { 2129 Node* n = _data_entry.at(j); 2130 visited_set(n); 2131 _stk.push(n); 2132 } 2133 visited_set(entry); 2134 _stk.push(entry); 2135 2136 // Do a depth first walk over out edges 2137 int rpo_idx = bb_ct - 1; 2138 int size; 2139 int reduction_uses = 0; 2140 while ((size = _stk.length()) > 0) { 2141 Node* n = _stk.top(); // Leave node on stack 2142 if (!visited_test_set(n)) { 2143 // forward arc in graph 2144 } else if (!post_visited_test(n)) { 2145 // cross or back arc 2146 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { 2147 Node *use = n->fast_out(i); 2148 if (in_bb(use) && !visited_test(use) && 2149 // Don't go around backedge 2150 (!use->is_Phi() || n == entry)) { 2151 if (use->is_reduction()) { 2152 // First see if we can map the reduction on the given system we are on, then 2153 // make a data entry operation for each reduction we see. 2154 BasicType bt = use->bottom_type()->basic_type(); 2155 if (ReductionNode::implemented(use->Opcode(), Matcher::min_vector_size(bt), bt)) { 2156 reduction_uses++; 2157 } 2158 } 2159 _stk.push(use); 2160 } 2161 } 2162 if (_stk.length() == size) { 2163 // There were no additional uses, post visit node now 2164 _stk.pop(); // Remove node from stack 2165 assert(rpo_idx >= 0, ""); 2166 _block.at_put_grow(rpo_idx, n); 2167 rpo_idx--; 2168 post_visited_set(n); 2169 assert(rpo_idx >= 0 || _stk.is_empty(), ""); 2170 } 2171 } else { 2172 _stk.pop(); // Remove post-visited node from stack 2173 } 2174 }//while 2175 2176 int ii_current = -1; 2177 unsigned int load_idx = (unsigned int)-1; 2178 _ii_order.clear(); 2179 // Create real map of block indices for nodes 2180 for (int j = 0; j < _block.length(); j++) { 2181 Node* n = _block.at(j); 2182 set_bb_idx(n, j); 2183 if (_do_vector_loop && n->is_Load()) { 2184 if (ii_current == -1) { 2185 ii_current = _clone_map.gen(n->_idx); 2186 _ii_order.push(ii_current); 2187 load_idx = _clone_map.idx(n->_idx); 2188 } else if (_clone_map.idx(n->_idx) == load_idx && _clone_map.gen(n->_idx) != ii_current) { 2189 ii_current = _clone_map.gen(n->_idx); 2190 _ii_order.push(ii_current); 2191 } 2192 } 2193 }//for 2194 2195 // Ensure extra info is allocated. 2196 initialize_bb(); 2197 2198 #ifndef PRODUCT 2199 if (_vector_loop_debug && _ii_order.length() > 0) { 2200 tty->print("SuperWord::construct_bb: List of generations: "); 2201 for (int jj = 0; jj < _ii_order.length(); ++jj) { 2202 tty->print(" %d:%d", jj, _ii_order.at(jj)); 2203 } 2204 tty->print_cr(" "); 2205 } 2206 if (TraceSuperWord) { 2207 print_bb(); 2208 tty->print_cr("\ndata entry nodes: %s", _data_entry.length() > 0 ? "" : "NONE"); 2209 for (int m = 0; m < _data_entry.length(); m++) { 2210 tty->print("%3d ", m); 2211 _data_entry.at(m)->dump(); 2212 } 2213 tty->print_cr("\nmemory slices: %s", _mem_slice_head.length() > 0 ? "" : "NONE"); 2214 for (int m = 0; m < _mem_slice_head.length(); m++) { 2215 tty->print("%3d ", m); _mem_slice_head.at(m)->dump(); 2216 tty->print(" "); _mem_slice_tail.at(m)->dump(); 2217 } 2218 } 2219 #endif 2220 assert(rpo_idx == -1 && bb_ct == _block.length(), "all block members found"); 2221 return (_mem_slice_head.length() > 0) || (reduction_uses > 0) || (_data_entry.length() > 0); 2222 } 2223 2224 //------------------------------initialize_bb--------------------------- 2225 // Initialize per node info 2226 void SuperWord::initialize_bb() { 2227 Node* last = _block.at(_block.length() - 1); 2228 grow_node_info(bb_idx(last)); 2229 } 2230 2231 //------------------------------bb_insert_after--------------------------- 2232 // Insert n into block after pos 2233 void SuperWord::bb_insert_after(Node* n, int pos) { 2234 int n_pos = pos + 1; 2235 // Make room 2236 for (int i = _block.length() - 1; i >= n_pos; i--) { 2237 _block.at_put_grow(i+1, _block.at(i)); 2238 } 2239 for (int j = _node_info.length() - 1; j >= n_pos; j--) { 2240 _node_info.at_put_grow(j+1, _node_info.at(j)); 2241 } 2242 // Set value 2243 _block.at_put_grow(n_pos, n); 2244 _node_info.at_put_grow(n_pos, SWNodeInfo::initial); 2245 // Adjust map from node->_idx to _block index 2246 for (int i = n_pos; i < _block.length(); i++) { 2247 set_bb_idx(_block.at(i), i); 2248 } 2249 } 2250 2251 //------------------------------compute_max_depth--------------------------- 2252 // Compute max depth for expressions from beginning of block 2253 // Use to prune search paths during test for independence. 2254 void SuperWord::compute_max_depth() { 2255 int ct = 0; 2256 bool again; 2257 do { 2258 again = false; 2259 for (int i = 0; i < _block.length(); i++) { 2260 Node* n = _block.at(i); 2261 if (!n->is_Phi()) { 2262 int d_orig = depth(n); 2263 int d_in = 0; 2264 for (DepPreds preds(n, _dg); !preds.done(); preds.next()) { 2265 Node* pred = preds.current(); 2266 if (in_bb(pred)) { 2267 d_in = MAX2(d_in, depth(pred)); 2268 } 2269 } 2270 if (d_in + 1 != d_orig) { 2271 set_depth(n, d_in + 1); 2272 again = true; 2273 } 2274 } 2275 } 2276 ct++; 2277 } while (again); 2278 #ifndef PRODUCT 2279 if (TraceSuperWord && Verbose) 2280 tty->print_cr("compute_max_depth iterated: %d times", ct); 2281 #endif 2282 } 2283 2284 //-------------------------compute_vector_element_type----------------------- 2285 // Compute necessary vector element type for expressions 2286 // This propagates backwards a narrower integer type when the 2287 // upper bits of the value are not needed. 2288 // Example: char a,b,c; a = b + c; 2289 // Normally the type of the add is integer, but for packed character 2290 // operations the type of the add needs to be char. 2291 void SuperWord::compute_vector_element_type() { 2292 #ifndef PRODUCT 2293 if (TraceSuperWord && Verbose) 2294 tty->print_cr("\ncompute_velt_type:"); 2295 #endif 2296 2297 // Initial type 2298 for (int i = 0; i < _block.length(); i++) { 2299 Node* n = _block.at(i); 2300 set_velt_type(n, container_type(n)); 2301 } 2302 2303 // Propagate integer narrowed type backwards through operations 2304 // that don't depend on higher order bits 2305 for (int i = _block.length() - 1; i >= 0; i--) { 2306 Node* n = _block.at(i); 2307 // Only integer types need be examined 2308 const Type* vtn = velt_type(n); 2309 if (vtn->basic_type() == T_INT) { 2310 uint start, end; 2311 VectorNode::vector_operands(n, &start, &end); 2312 2313 for (uint j = start; j < end; j++) { 2314 Node* in = n->in(j); 2315 // Don't propagate through a memory 2316 if (!in->is_Mem() && in_bb(in) && velt_type(in)->basic_type() == T_INT && 2317 data_size(n) < data_size(in)) { 2318 bool same_type = true; 2319 for (DUIterator_Fast kmax, k = in->fast_outs(kmax); k < kmax; k++) { 2320 Node *use = in->fast_out(k); 2321 if (!in_bb(use) || !same_velt_type(use, n)) { 2322 same_type = false; 2323 break; 2324 } 2325 } 2326 if (same_type) { 2327 // For right shifts of small integer types (bool, byte, char, short) 2328 // we need precise information about sign-ness. Only Load nodes have 2329 // this information because Store nodes are the same for signed and 2330 // unsigned values. And any arithmetic operation after a load may 2331 // expand a value to signed Int so such right shifts can't be used 2332 // because vector elements do not have upper bits of Int. 2333 const Type* vt = vtn; 2334 if (VectorNode::is_shift(in)) { 2335 Node* load = in->in(1); 2336 if (load->is_Load() && in_bb(load) && (velt_type(load)->basic_type() == T_INT)) { 2337 vt = velt_type(load); 2338 } else if (in->Opcode() != Op_LShiftI) { 2339 // Widen type to Int to avoid creation of right shift vector 2340 // (align + data_size(s1) check in stmts_can_pack() will fail). 2341 // Note, left shifts work regardless type. 2342 vt = TypeInt::INT; 2343 } 2344 } 2345 set_velt_type(in, vt); 2346 } 2347 } 2348 } 2349 } 2350 } 2351 #ifndef PRODUCT 2352 if (TraceSuperWord && Verbose) { 2353 for (int i = 0; i < _block.length(); i++) { 2354 Node* n = _block.at(i); 2355 velt_type(n)->dump(); 2356 tty->print("\t"); 2357 n->dump(); 2358 } 2359 } 2360 #endif 2361 } 2362 2363 //------------------------------memory_alignment--------------------------- 2364 // Alignment within a vector memory reference 2365 int SuperWord::memory_alignment(MemNode* s, int iv_adjust) { 2366 #ifndef PRODUCT 2367 if(TraceSuperWord && Verbose) { 2368 tty->print("SuperWord::memory_alignment within a vector memory reference for %d: ", s->_idx); s->dump(); 2369 } 2370 #endif 2371 NOT_PRODUCT(SWPointer::Tracer::Depth ddd(0);) 2372 SWPointer p(s, this, NULL, false); 2373 if (!p.valid()) { 2374 NOT_PRODUCT(if(is_trace_alignment()) tty->print("SWPointer::memory_alignment: SWPointer p invalid, return bottom_align");) 2375 return bottom_align; 2376 } 2377 int vw = vector_width_in_bytes(s); 2378 if (vw < 2) { 2379 NOT_PRODUCT(if(is_trace_alignment()) tty->print_cr("SWPointer::memory_alignment: vector_width_in_bytes < 2, return bottom_align");) 2380 return bottom_align; // No vectors for this type 2381 } 2382 int offset = p.offset_in_bytes(); 2383 offset += iv_adjust*p.memory_size(); 2384 int off_rem = offset % vw; 2385 int off_mod = off_rem >= 0 ? off_rem : off_rem + vw; 2386 NOT_PRODUCT(if(TraceSuperWord && Verbose) tty->print_cr("SWPointer::memory_alignment: off_rem = %d, off_mod = %d", off_rem, off_mod);) 2387 return off_mod; 2388 } 2389 2390 //---------------------------container_type--------------------------- 2391 // Smallest type containing range of values 2392 const Type* SuperWord::container_type(Node* n) { 2393 if (n->is_Mem()) { 2394 BasicType bt = n->as_Mem()->memory_type(); 2395 if (n->is_Store() && (bt == T_CHAR)) { 2396 // Use T_SHORT type instead of T_CHAR for stored values because any 2397 // preceding arithmetic operation extends values to signed Int. 2398 bt = T_SHORT; 2399 } 2400 if (n->Opcode() == Op_LoadUB) { 2401 // Adjust type for unsigned byte loads, it is important for right shifts. 2402 // T_BOOLEAN is used because there is no basic type representing type 2403 // TypeInt::UBYTE. Use of T_BOOLEAN for vectors is fine because only 2404 // size (one byte) and sign is important. 2405 bt = T_BOOLEAN; 2406 } 2407 return Type::get_const_basic_type(bt); 2408 } 2409 const Type* t = _igvn.type(n); 2410 if (t->basic_type() == T_INT) { 2411 // A narrow type of arithmetic operations will be determined by 2412 // propagating the type of memory operations. 2413 return TypeInt::INT; 2414 } 2415 return t; 2416 } 2417 2418 bool SuperWord::same_velt_type(Node* n1, Node* n2) { 2419 const Type* vt1 = velt_type(n1); 2420 const Type* vt2 = velt_type(n2); 2421 if (vt1->basic_type() == T_INT && vt2->basic_type() == T_INT) { 2422 // Compare vectors element sizes for integer types. 2423 return data_size(n1) == data_size(n2); 2424 } 2425 return vt1 == vt2; 2426 } 2427 2428 //------------------------------in_packset--------------------------- 2429 // Are s1 and s2 in a pack pair and ordered as s1,s2? 2430 bool SuperWord::in_packset(Node* s1, Node* s2) { 2431 for (int i = 0; i < _packset.length(); i++) { 2432 Node_List* p = _packset.at(i); 2433 assert(p->size() == 2, "must be"); 2434 if (p->at(0) == s1 && p->at(p->size()-1) == s2) { 2435 return true; 2436 } 2437 } 2438 return false; 2439 } 2440 2441 //------------------------------in_pack--------------------------- 2442 // Is s in pack p? 2443 Node_List* SuperWord::in_pack(Node* s, Node_List* p) { 2444 for (uint i = 0; i < p->size(); i++) { 2445 if (p->at(i) == s) { 2446 return p; 2447 } 2448 } 2449 return NULL; 2450 } 2451 2452 //------------------------------remove_pack_at--------------------------- 2453 // Remove the pack at position pos in the packset 2454 void SuperWord::remove_pack_at(int pos) { 2455 Node_List* p = _packset.at(pos); 2456 for (uint i = 0; i < p->size(); i++) { 2457 Node* s = p->at(i); 2458 set_my_pack(s, NULL); 2459 } 2460 _packset.remove_at(pos); 2461 } 2462 2463 void SuperWord::packset_sort(int n) { 2464 // simple bubble sort so that we capitalize with O(n) when its already sorted 2465 while (n != 0) { 2466 bool swapped = false; 2467 for (int i = 1; i < n; i++) { 2468 Node_List* q_low = _packset.at(i-1); 2469 Node_List* q_i = _packset.at(i); 2470 2471 // only swap when we find something to swap 2472 if (alignment(q_low->at(0)) > alignment(q_i->at(0))) { 2473 Node_List* t = q_i; 2474 *(_packset.adr_at(i)) = q_low; 2475 *(_packset.adr_at(i-1)) = q_i; 2476 swapped = true; 2477 } 2478 } 2479 if (swapped == false) break; 2480 n--; 2481 } 2482 } 2483 2484 //------------------------------executed_first--------------------------- 2485 // Return the node executed first in pack p. Uses the RPO block list 2486 // to determine order. 2487 Node* SuperWord::executed_first(Node_List* p) { 2488 Node* n = p->at(0); 2489 int n_rpo = bb_idx(n); 2490 for (uint i = 1; i < p->size(); i++) { 2491 Node* s = p->at(i); 2492 int s_rpo = bb_idx(s); 2493 if (s_rpo < n_rpo) { 2494 n = s; 2495 n_rpo = s_rpo; 2496 } 2497 } 2498 return n; 2499 } 2500 2501 //------------------------------executed_last--------------------------- 2502 // Return the node executed last in pack p. 2503 Node* SuperWord::executed_last(Node_List* p) { 2504 Node* n = p->at(0); 2505 int n_rpo = bb_idx(n); 2506 for (uint i = 1; i < p->size(); i++) { 2507 Node* s = p->at(i); 2508 int s_rpo = bb_idx(s); 2509 if (s_rpo > n_rpo) { 2510 n = s; 2511 n_rpo = s_rpo; 2512 } 2513 } 2514 return n; 2515 } 2516 2517 LoadNode::ControlDependency SuperWord::control_dependency(Node_List* p) { 2518 LoadNode::ControlDependency dep = LoadNode::DependsOnlyOnTest; 2519 for (uint i = 0; i < p->size(); i++) { 2520 Node* n = p->at(i); 2521 assert(n->is_Load(), "only meaningful for loads"); 2522 if (!n->depends_only_on_test()) { 2523 dep = LoadNode::Pinned; 2524 } 2525 } 2526 return dep; 2527 } 2528 2529 2530 //----------------------------align_initial_loop_index--------------------------- 2531 // Adjust pre-loop limit so that in main loop, a load/store reference 2532 // to align_to_ref will be a position zero in the vector. 2533 // (iv + k) mod vector_align == 0 2534 void SuperWord::align_initial_loop_index(MemNode* align_to_ref) { 2535 CountedLoopNode *main_head = lp()->as_CountedLoop(); 2536 assert(main_head->is_main_loop(), ""); 2537 CountedLoopEndNode* pre_end = get_pre_loop_end(main_head); 2538 assert(pre_end != NULL, "we must have a correct pre-loop"); 2539 Node *pre_opaq1 = pre_end->limit(); 2540 assert(pre_opaq1->Opcode() == Op_Opaque1, ""); 2541 Opaque1Node *pre_opaq = (Opaque1Node*)pre_opaq1; 2542 Node *lim0 = pre_opaq->in(1); 2543 2544 // Where we put new limit calculations 2545 Node *pre_ctrl = pre_end->loopnode()->in(LoopNode::EntryControl); 2546 2547 // Ensure the original loop limit is available from the 2548 // pre-loop Opaque1 node. 2549 Node *orig_limit = pre_opaq->original_loop_limit(); 2550 assert(orig_limit != NULL && _igvn.type(orig_limit) != Type::TOP, ""); 2551 2552 SWPointer align_to_ref_p(align_to_ref, this, NULL, false); 2553 assert(align_to_ref_p.valid(), "sanity"); 2554 2555 // Given: 2556 // lim0 == original pre loop limit 2557 // V == v_align (power of 2) 2558 // invar == extra invariant piece of the address expression 2559 // e == offset [ +/- invar ] 2560 // 2561 // When reassociating expressions involving '%' the basic rules are: 2562 // (a - b) % k == 0 => a % k == b % k 2563 // and: 2564 // (a + b) % k == 0 => a % k == (k - b) % k 2565 // 2566 // For stride > 0 && scale > 0, 2567 // Derive the new pre-loop limit "lim" such that the two constraints: 2568 // (1) lim = lim0 + N (where N is some positive integer < V) 2569 // (2) (e + lim) % V == 0 2570 // are true. 2571 // 2572 // Substituting (1) into (2), 2573 // (e + lim0 + N) % V == 0 2574 // solve for N: 2575 // N = (V - (e + lim0)) % V 2576 // substitute back into (1), so that new limit 2577 // lim = lim0 + (V - (e + lim0)) % V 2578 // 2579 // For stride > 0 && scale < 0 2580 // Constraints: 2581 // lim = lim0 + N 2582 // (e - lim) % V == 0 2583 // Solving for lim: 2584 // (e - lim0 - N) % V == 0 2585 // N = (e - lim0) % V 2586 // lim = lim0 + (e - lim0) % V 2587 // 2588 // For stride < 0 && scale > 0 2589 // Constraints: 2590 // lim = lim0 - N 2591 // (e + lim) % V == 0 2592 // Solving for lim: 2593 // (e + lim0 - N) % V == 0 2594 // N = (e + lim0) % V 2595 // lim = lim0 - (e + lim0) % V 2596 // 2597 // For stride < 0 && scale < 0 2598 // Constraints: 2599 // lim = lim0 - N 2600 // (e - lim) % V == 0 2601 // Solving for lim: 2602 // (e - lim0 + N) % V == 0 2603 // N = (V - (e - lim0)) % V 2604 // lim = lim0 - (V - (e - lim0)) % V 2605 2606 int vw = vector_width_in_bytes(align_to_ref); 2607 int stride = iv_stride(); 2608 int scale = align_to_ref_p.scale_in_bytes(); 2609 int elt_size = align_to_ref_p.memory_size(); 2610 int v_align = vw / elt_size; 2611 assert(v_align > 1, "sanity"); 2612 int offset = align_to_ref_p.offset_in_bytes() / elt_size; 2613 Node *offsn = _igvn.intcon(offset); 2614 2615 Node *e = offsn; 2616 if (align_to_ref_p.invar() != NULL) { 2617 // incorporate any extra invariant piece producing (offset +/- invar) >>> log2(elt) 2618 Node* log2_elt = _igvn.intcon(exact_log2(elt_size)); 2619 Node* aref = new URShiftINode(align_to_ref_p.invar(), log2_elt); 2620 _igvn.register_new_node_with_optimizer(aref); 2621 _phase->set_ctrl(aref, pre_ctrl); 2622 if (align_to_ref_p.negate_invar()) { 2623 e = new SubINode(e, aref); 2624 } else { 2625 e = new AddINode(e, aref); 2626 } 2627 _igvn.register_new_node_with_optimizer(e); 2628 _phase->set_ctrl(e, pre_ctrl); 2629 } 2630 if (vw > ObjectAlignmentInBytes) { 2631 // incorporate base e +/- base && Mask >>> log2(elt) 2632 Node* xbase = new CastP2XNode(NULL, align_to_ref_p.base()); 2633 _igvn.register_new_node_with_optimizer(xbase); 2634 #ifdef _LP64 2635 xbase = new ConvL2INode(xbase); 2636 _igvn.register_new_node_with_optimizer(xbase); 2637 #endif 2638 Node* mask = _igvn.intcon(vw-1); 2639 Node* masked_xbase = new AndINode(xbase, mask); 2640 _igvn.register_new_node_with_optimizer(masked_xbase); 2641 Node* log2_elt = _igvn.intcon(exact_log2(elt_size)); 2642 Node* bref = new URShiftINode(masked_xbase, log2_elt); 2643 _igvn.register_new_node_with_optimizer(bref); 2644 _phase->set_ctrl(bref, pre_ctrl); 2645 e = new AddINode(e, bref); 2646 _igvn.register_new_node_with_optimizer(e); 2647 _phase->set_ctrl(e, pre_ctrl); 2648 } 2649 2650 // compute e +/- lim0 2651 if (scale < 0) { 2652 e = new SubINode(e, lim0); 2653 } else { 2654 e = new AddINode(e, lim0); 2655 } 2656 _igvn.register_new_node_with_optimizer(e); 2657 _phase->set_ctrl(e, pre_ctrl); 2658 2659 if (stride * scale > 0) { 2660 // compute V - (e +/- lim0) 2661 Node* va = _igvn.intcon(v_align); 2662 e = new SubINode(va, e); 2663 _igvn.register_new_node_with_optimizer(e); 2664 _phase->set_ctrl(e, pre_ctrl); 2665 } 2666 // compute N = (exp) % V 2667 Node* va_msk = _igvn.intcon(v_align - 1); 2668 Node* N = new AndINode(e, va_msk); 2669 _igvn.register_new_node_with_optimizer(N); 2670 _phase->set_ctrl(N, pre_ctrl); 2671 2672 // substitute back into (1), so that new limit 2673 // lim = lim0 + N 2674 Node* lim; 2675 if (stride < 0) { 2676 lim = new SubINode(lim0, N); 2677 } else { 2678 lim = new AddINode(lim0, N); 2679 } 2680 _igvn.register_new_node_with_optimizer(lim); 2681 _phase->set_ctrl(lim, pre_ctrl); 2682 Node* constrained = 2683 (stride > 0) ? (Node*) new MinINode(lim, orig_limit) 2684 : (Node*) new MaxINode(lim, orig_limit); 2685 _igvn.register_new_node_with_optimizer(constrained); 2686 _phase->set_ctrl(constrained, pre_ctrl); 2687 _igvn.hash_delete(pre_opaq); 2688 pre_opaq->set_req(1, constrained); 2689 } 2690 2691 //----------------------------get_pre_loop_end--------------------------- 2692 // Find pre loop end from main loop. Returns null if none. 2693 CountedLoopEndNode* SuperWord::get_pre_loop_end(CountedLoopNode* cl) { 2694 Node* ctrl = cl->in(LoopNode::EntryControl); 2695 if (!ctrl->is_IfTrue() && !ctrl->is_IfFalse()) return NULL; 2696 Node* iffm = ctrl->in(0); 2697 if (!iffm->is_If()) return NULL; 2698 Node* bolzm = iffm->in(1); 2699 if (!bolzm->is_Bool()) return NULL; 2700 Node* cmpzm = bolzm->in(1); 2701 if (!cmpzm->is_Cmp()) return NULL; 2702 Node* opqzm = cmpzm->in(2); 2703 // Can not optimize a loop if zero-trip Opaque1 node is optimized 2704 // away and then another round of loop opts attempted. 2705 if (opqzm->Opcode() != Op_Opaque1) { 2706 return NULL; 2707 } 2708 Node* p_f = iffm->in(0); 2709 if (!p_f->is_IfFalse()) return NULL; 2710 if (!p_f->in(0)->is_CountedLoopEnd()) return NULL; 2711 CountedLoopEndNode* pre_end = p_f->in(0)->as_CountedLoopEnd(); 2712 CountedLoopNode* loop_node = pre_end->loopnode(); 2713 if (loop_node == NULL || !loop_node->is_pre_loop()) return NULL; 2714 return pre_end; 2715 } 2716 2717 2718 //------------------------------init--------------------------- 2719 void SuperWord::init() { 2720 _dg.init(); 2721 _packset.clear(); 2722 _disjoint_ptrs.clear(); 2723 _block.clear(); 2724 _data_entry.clear(); 2725 _mem_slice_head.clear(); 2726 _mem_slice_tail.clear(); 2727 _iteration_first.clear(); 2728 _iteration_last.clear(); 2729 _node_info.clear(); 2730 _align_to_ref = NULL; 2731 _lpt = NULL; 2732 _lp = NULL; 2733 _bb = NULL; 2734 _iv = NULL; 2735 _race_possible = 0; 2736 _early_return = false; 2737 _num_work_vecs = 0; 2738 _num_reductions = 0; 2739 } 2740 2741 //------------------------------restart--------------------------- 2742 void SuperWord::restart() { 2743 _dg.init(); 2744 _packset.clear(); 2745 _disjoint_ptrs.clear(); 2746 _block.clear(); 2747 _data_entry.clear(); 2748 _mem_slice_head.clear(); 2749 _mem_slice_tail.clear(); 2750 _node_info.clear(); 2751 } 2752 2753 //------------------------------print_packset--------------------------- 2754 void SuperWord::print_packset() { 2755 #ifndef PRODUCT 2756 tty->print_cr("packset"); 2757 for (int i = 0; i < _packset.length(); i++) { 2758 tty->print_cr("Pack: %d", i); 2759 Node_List* p = _packset.at(i); 2760 print_pack(p); 2761 } 2762 #endif 2763 } 2764 2765 //------------------------------print_pack--------------------------- 2766 void SuperWord::print_pack(Node_List* p) { 2767 for (uint i = 0; i < p->size(); i++) { 2768 print_stmt(p->at(i)); 2769 } 2770 } 2771 2772 //------------------------------print_bb--------------------------- 2773 void SuperWord::print_bb() { 2774 #ifndef PRODUCT 2775 tty->print_cr("\nBlock"); 2776 for (int i = 0; i < _block.length(); i++) { 2777 Node* n = _block.at(i); 2778 tty->print("%d ", i); 2779 if (n) { 2780 n->dump(); 2781 } 2782 } 2783 #endif 2784 } 2785 2786 //------------------------------print_stmt--------------------------- 2787 void SuperWord::print_stmt(Node* s) { 2788 #ifndef PRODUCT 2789 tty->print(" align: %d \t", alignment(s)); 2790 s->dump(); 2791 #endif 2792 } 2793 2794 //------------------------------blank--------------------------- 2795 char* SuperWord::blank(uint depth) { 2796 static char blanks[101]; 2797 assert(depth < 101, "too deep"); 2798 for (uint i = 0; i < depth; i++) blanks[i] = ' '; 2799 blanks[depth] = '\0'; 2800 return blanks; 2801 } 2802 2803 2804 //==============================SWPointer=========================== 2805 #ifndef PRODUCT 2806 int SWPointer::Tracer::_depth = 0; 2807 #endif 2808 //----------------------------SWPointer------------------------ 2809 SWPointer::SWPointer(MemNode* mem, SuperWord* slp, Node_Stack *nstack, bool analyze_only) : 2810 _mem(mem), _slp(slp), _base(NULL), _adr(NULL), 2811 _scale(0), _offset(0), _invar(NULL), _negate_invar(false), 2812 _nstack(nstack), _analyze_only(analyze_only), 2813 _stack_idx(0) 2814 #ifndef PRODUCT 2815 , _tracer(slp) 2816 #endif 2817 { 2818 NOT_PRODUCT(_tracer.ctor_1(mem);) 2819 2820 Node* adr = mem->in(MemNode::Address); 2821 if (!adr->is_AddP()) { 2822 assert(!valid(), "too complex"); 2823 return; 2824 } 2825 // Match AddP(base, AddP(ptr, k*iv [+ invariant]), constant) 2826 Node* base = adr->in(AddPNode::Base); 2827 // The base address should be loop invariant 2828 if (!invariant(base)) { 2829 assert(!valid(), "base address is loop variant"); 2830 return; 2831 } 2832 //unsafe reference could not be aligned appropriately without runtime checking 2833 if (base == NULL || base->bottom_type() == Type::TOP) { 2834 assert(!valid(), "unsafe access"); 2835 return; 2836 } 2837 2838 NOT_PRODUCT(if(_slp->is_trace_alignment()) _tracer.store_depth();) 2839 NOT_PRODUCT(_tracer.ctor_2(adr);) 2840 2841 int i; 2842 for (i = 0; i < 3; i++) { 2843 NOT_PRODUCT(_tracer.ctor_3(adr, i);) 2844 2845 if (!scaled_iv_plus_offset(adr->in(AddPNode::Offset))) { 2846 assert(!valid(), "too complex"); 2847 return; 2848 } 2849 adr = adr->in(AddPNode::Address); 2850 NOT_PRODUCT(_tracer.ctor_4(adr, i);) 2851 2852 if (base == adr || !adr->is_AddP()) { 2853 NOT_PRODUCT(_tracer.ctor_5(adr, base, i);) 2854 break; // stop looking at addp's 2855 } 2856 } 2857 NOT_PRODUCT(if(_slp->is_trace_alignment()) _tracer.restore_depth();) 2858 NOT_PRODUCT(_tracer.ctor_6(mem);) 2859 2860 _base = base; 2861 _adr = adr; 2862 assert(valid(), "Usable"); 2863 } 2864 2865 // Following is used to create a temporary object during 2866 // the pattern match of an address expression. 2867 SWPointer::SWPointer(SWPointer* p) : 2868 _mem(p->_mem), _slp(p->_slp), _base(NULL), _adr(NULL), 2869 _scale(0), _offset(0), _invar(NULL), _negate_invar(false), 2870 _nstack(p->_nstack), _analyze_only(p->_analyze_only), 2871 _stack_idx(p->_stack_idx) 2872 #ifndef PRODUCT 2873 , _tracer(p->_slp) 2874 #endif 2875 {} 2876 2877 2878 bool SWPointer::invariant(Node* n) { 2879 NOT_PRODUCT(Tracer::Depth dd;) 2880 Node *n_c = phase()->get_ctrl(n); 2881 NOT_PRODUCT(_tracer.invariant_1(n, n_c);) 2882 return !lpt()->is_member(phase()->get_loop(n_c)); 2883 } 2884 //------------------------scaled_iv_plus_offset-------------------- 2885 // Match: k*iv + offset 2886 // where: k is a constant that maybe zero, and 2887 // offset is (k2 [+/- invariant]) where k2 maybe zero and invariant is optional 2888 bool SWPointer::scaled_iv_plus_offset(Node* n) { 2889 NOT_PRODUCT(Tracer::Depth ddd;) 2890 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_1(n);) 2891 2892 if (scaled_iv(n)) { 2893 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_2(n);) 2894 return true; 2895 } 2896 2897 if (offset_plus_k(n)) { 2898 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_3(n);) 2899 return true; 2900 } 2901 2902 int opc = n->Opcode(); 2903 if (opc == Op_AddI) { 2904 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2))) { 2905 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_4(n);) 2906 return true; 2907 } 2908 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { 2909 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_5(n);) 2910 return true; 2911 } 2912 } else if (opc == Op_SubI) { 2913 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2), true)) { 2914 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_6(n);) 2915 return true; 2916 } 2917 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { 2918 _scale *= -1; 2919 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_7(n);) 2920 return true; 2921 } 2922 } 2923 2924 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_8(n);) 2925 return false; 2926 } 2927 2928 //----------------------------scaled_iv------------------------ 2929 // Match: k*iv where k is a constant that's not zero 2930 bool SWPointer::scaled_iv(Node* n) { 2931 NOT_PRODUCT(Tracer::Depth ddd;) 2932 NOT_PRODUCT(_tracer.scaled_iv_1(n);) 2933 2934 if (_scale != 0) { // already found a scale 2935 NOT_PRODUCT(_tracer.scaled_iv_2(n, _scale);) 2936 return false; 2937 } 2938 2939 if (n == iv()) { 2940 _scale = 1; 2941 NOT_PRODUCT(_tracer.scaled_iv_3(n, _scale);) 2942 return true; 2943 } 2944 if (_analyze_only && (invariant(n) == false)) { 2945 _nstack->push(n, _stack_idx++); 2946 } 2947 2948 int opc = n->Opcode(); 2949 if (opc == Op_MulI) { 2950 if (n->in(1) == iv() && n->in(2)->is_Con()) { 2951 _scale = n->in(2)->get_int(); 2952 NOT_PRODUCT(_tracer.scaled_iv_4(n, _scale);) 2953 return true; 2954 } else if (n->in(2) == iv() && n->in(1)->is_Con()) { 2955 _scale = n->in(1)->get_int(); 2956 NOT_PRODUCT(_tracer.scaled_iv_5(n, _scale);) 2957 return true; 2958 } 2959 } else if (opc == Op_LShiftI) { 2960 if (n->in(1) == iv() && n->in(2)->is_Con()) { 2961 _scale = 1 << n->in(2)->get_int(); 2962 NOT_PRODUCT(_tracer.scaled_iv_6(n, _scale);) 2963 return true; 2964 } 2965 } else if (opc == Op_ConvI2L) { 2966 if (scaled_iv_plus_offset(n->in(1))) { 2967 NOT_PRODUCT(_tracer.scaled_iv_7(n);) 2968 return true; 2969 } 2970 } else if (opc == Op_LShiftL) { 2971 if (!has_iv() && _invar == NULL) { 2972 // Need to preserve the current _offset value, so 2973 // create a temporary object for this expression subtree. 2974 // Hacky, so should re-engineer the address pattern match. 2975 NOT_PRODUCT(Tracer::Depth dddd;) 2976 SWPointer tmp(this); 2977 NOT_PRODUCT(_tracer.scaled_iv_8(n, &tmp);) 2978 2979 if (tmp.scaled_iv_plus_offset(n->in(1))) { 2980 if (tmp._invar == NULL || _slp->do_vector_loop()) { 2981 int mult = 1 << n->in(2)->get_int(); 2982 _scale = tmp._scale * mult; 2983 _offset += tmp._offset * mult; 2984 NOT_PRODUCT(_tracer.scaled_iv_9(n, _scale, _offset, mult);) 2985 return true; 2986 } 2987 } 2988 } 2989 } 2990 NOT_PRODUCT(_tracer.scaled_iv_10(n);) 2991 return false; 2992 } 2993 2994 //----------------------------offset_plus_k------------------------ 2995 // Match: offset is (k [+/- invariant]) 2996 // where k maybe zero and invariant is optional, but not both. 2997 bool SWPointer::offset_plus_k(Node* n, bool negate) { 2998 NOT_PRODUCT(Tracer::Depth ddd;) 2999 NOT_PRODUCT(_tracer.offset_plus_k_1(n);) 3000 3001 int opc = n->Opcode(); 3002 if (opc == Op_ConI) { 3003 _offset += negate ? -(n->get_int()) : n->get_int(); 3004 NOT_PRODUCT(_tracer.offset_plus_k_2(n, _offset);) 3005 return true; 3006 } else if (opc == Op_ConL) { 3007 // Okay if value fits into an int 3008 const TypeLong* t = n->find_long_type(); 3009 if (t->higher_equal(TypeLong::INT)) { 3010 jlong loff = n->get_long(); 3011 jint off = (jint)loff; 3012 _offset += negate ? -off : loff; 3013 NOT_PRODUCT(_tracer.offset_plus_k_3(n, _offset);) 3014 return true; 3015 } 3016 NOT_PRODUCT(_tracer.offset_plus_k_4(n);) 3017 return false; 3018 } 3019 if (_invar != NULL) { // already has an invariant 3020 NOT_PRODUCT(_tracer.offset_plus_k_5(n, _invar);) 3021 return false; 3022 } 3023 3024 if (_analyze_only && (invariant(n) == false)) { 3025 _nstack->push(n, _stack_idx++); 3026 } 3027 if (opc == Op_AddI) { 3028 if (n->in(2)->is_Con() && invariant(n->in(1))) { 3029 _negate_invar = negate; 3030 _invar = n->in(1); 3031 _offset += negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); 3032 NOT_PRODUCT(_tracer.offset_plus_k_6(n, _invar, _negate_invar, _offset);) 3033 return true; 3034 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { 3035 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); 3036 _negate_invar = negate; 3037 _invar = n->in(2); 3038 NOT_PRODUCT(_tracer.offset_plus_k_7(n, _invar, _negate_invar, _offset);) 3039 return true; 3040 } 3041 } 3042 if (opc == Op_SubI) { 3043 if (n->in(2)->is_Con() && invariant(n->in(1))) { 3044 _negate_invar = negate; 3045 _invar = n->in(1); 3046 _offset += !negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); 3047 NOT_PRODUCT(_tracer.offset_plus_k_8(n, _invar, _negate_invar, _offset);) 3048 return true; 3049 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { 3050 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); 3051 _negate_invar = !negate; 3052 _invar = n->in(2); 3053 NOT_PRODUCT(_tracer.offset_plus_k_9(n, _invar, _negate_invar, _offset);) 3054 return true; 3055 } 3056 } 3057 if (invariant(n)) { 3058 if (opc == Op_ConvI2L) { 3059 n = n->in(1); 3060 } 3061 _negate_invar = negate; 3062 _invar = n; 3063 NOT_PRODUCT(_tracer.offset_plus_k_10(n, _invar, _negate_invar, _offset);) 3064 return true; 3065 } 3066 3067 NOT_PRODUCT(_tracer.offset_plus_k_11(n);) 3068 return false; 3069 } 3070 3071 //----------------------------print------------------------ 3072 void SWPointer::print() { 3073 #ifndef PRODUCT 3074 tty->print("base: %d adr: %d scale: %d offset: %d invar: %c%d\n", 3075 _base != NULL ? _base->_idx : 0, 3076 _adr != NULL ? _adr->_idx : 0, 3077 _scale, _offset, 3078 _negate_invar?'-':'+', 3079 _invar != NULL ? _invar->_idx : 0); 3080 #endif 3081 } 3082 3083 //----------------------------tracing------------------------ 3084 #ifndef PRODUCT 3085 void SWPointer::Tracer::print_depth() { 3086 for (int ii = 0; ii<_depth; ++ii) tty->print(" "); 3087 } 3088 3089 void SWPointer::Tracer::ctor_1 (Node* mem) { 3090 if(_slp->is_trace_alignment()) { 3091 print_depth(); tty->print(" %d SWPointer::SWPointer: start alignment analysis", mem->_idx); mem->dump(); 3092 } 3093 } 3094 3095 void SWPointer::Tracer::ctor_2(Node* adr) { 3096 if(_slp->is_trace_alignment()) { 3097 //store_depth(); 3098 inc_depth(); 3099 print_depth(); tty->print(" %d (adr) SWPointer::SWPointer: ", adr->_idx); adr->dump(); 3100 inc_depth(); 3101 print_depth(); tty->print(" %d (base) SWPointer::SWPointer: ", adr->in(AddPNode::Base)->_idx); adr->in(AddPNode::Base)->dump(); 3102 } 3103 } 3104 3105 void SWPointer::Tracer::ctor_3(Node* adr, int i) { 3106 if(_slp->is_trace_alignment()) { 3107 inc_depth(); 3108 Node* offset = adr->in(AddPNode::Offset); 3109 print_depth(); tty->print(" %d (offset) SWPointer::SWPointer: i = %d: ", offset->_idx, i); offset->dump(); 3110 } 3111 } 3112 3113 void SWPointer::Tracer::ctor_4(Node* adr, int i) { 3114 if(_slp->is_trace_alignment()) { 3115 inc_depth(); 3116 print_depth(); tty->print(" %d (adr) SWPointer::SWPointer: i = %d: ", adr->_idx, i); adr->dump(); 3117 } 3118 } 3119 3120 void SWPointer::Tracer::ctor_5(Node* adr, Node* base, int i) { 3121 if(_slp->is_trace_alignment()) { 3122 inc_depth(); 3123 if (base == adr) { 3124 print_depth(); tty->print_cr(" \\ %d (adr) == %d (base) SWPointer::SWPointer: breaking analysis at i = %d", adr->_idx, base->_idx, i); 3125 } else if (!adr->is_AddP()) { 3126 print_depth(); tty->print_cr(" \\ %d (adr) is NOT Addp SWPointer::SWPointer: breaking analysis at i = %d", adr->_idx, i); 3127 } 3128 } 3129 } 3130 3131 void SWPointer::Tracer::ctor_6(Node* mem) { 3132 if(_slp->is_trace_alignment()) { 3133 //restore_depth(); 3134 print_depth(); tty->print_cr(" %d (adr) SWPointer::SWPointer: stop analysis", mem->_idx); 3135 } 3136 } 3137 3138 void SWPointer::Tracer::invariant_1(Node *n, Node *n_c) { 3139 if (_slp->do_vector_loop() && _slp->is_debug() && _slp->_lpt->is_member(_slp->_phase->get_loop(n_c)) != (int)_slp->in_bb(n)) { 3140 int is_member = _slp->_lpt->is_member(_slp->_phase->get_loop(n_c)); 3141 int in_bb = _slp->in_bb(n); 3142 print_depth(); tty->print(" \\ "); tty->print_cr(" %d SWPointer::invariant conditions differ: n_c %d", n->_idx, n_c->_idx); 3143 print_depth(); tty->print(" \\ "); tty->print_cr("is_member %d, in_bb %d", is_member, in_bb); 3144 print_depth(); tty->print(" \\ "); n->dump(); 3145 print_depth(); tty->print(" \\ "); n_c->dump(); 3146 } 3147 } 3148 3149 void SWPointer::Tracer::scaled_iv_plus_offset_1(Node* n) { 3150 if(_slp->is_trace_alignment()) { 3151 print_depth(); tty->print(" %d SWPointer::scaled_iv_plus_offset testing node: ", n->_idx); 3152 n->dump(); 3153 } 3154 } 3155 3156 void SWPointer::Tracer::scaled_iv_plus_offset_2(Node* n) { 3157 if(_slp->is_trace_alignment()) { 3158 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: PASSED", n->_idx); 3159 } 3160 } 3161 3162 void SWPointer::Tracer::scaled_iv_plus_offset_3(Node* n) { 3163 if(_slp->is_trace_alignment()) { 3164 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: PASSED", n->_idx); 3165 } 3166 } 3167 3168 void SWPointer::Tracer::scaled_iv_plus_offset_4(Node* n) { 3169 if(_slp->is_trace_alignment()) { 3170 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: Op_AddI PASSED", n->_idx); 3171 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(1) is scaled_iv: ", n->in(1)->_idx); n->in(1)->dump(); 3172 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(2) is offset_plus_k: ", n->in(2)->_idx); n->in(2)->dump(); 3173 } 3174 } 3175 3176 void SWPointer::Tracer::scaled_iv_plus_offset_5(Node* n) { 3177 if(_slp->is_trace_alignment()) { 3178 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: Op_AddI PASSED", n->_idx); 3179 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(2) is scaled_iv: ", n->in(2)->_idx); n->in(2)->dump(); 3180 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(1) is offset_plus_k: ", n->in(1)->_idx); n->in(1)->dump(); 3181 } 3182 } 3183 3184 void SWPointer::Tracer::scaled_iv_plus_offset_6(Node* n) { 3185 if(_slp->is_trace_alignment()) { 3186 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: Op_SubI PASSED", n->_idx); 3187 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(1) is scaled_iv: ", n->in(1)->_idx); n->in(1)->dump(); 3188 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(2) is offset_plus_k: ", n->in(2)->_idx); n->in(2)->dump(); 3189 } 3190 } 3191 3192 void SWPointer::Tracer::scaled_iv_plus_offset_7(Node* n) { 3193 if(_slp->is_trace_alignment()) { 3194 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: Op_SubI PASSED", n->_idx); 3195 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(2) is scaled_iv: ", n->in(2)->_idx); n->in(2)->dump(); 3196 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(1) is offset_plus_k: ", n->in(1)->_idx); n->in(1)->dump(); 3197 } 3198 } 3199 3200 void SWPointer::Tracer::scaled_iv_plus_offset_8(Node* n) { 3201 if(_slp->is_trace_alignment()) { 3202 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: FAILED", n->_idx); 3203 } 3204 } 3205 3206 void SWPointer::Tracer::scaled_iv_1(Node* n) { 3207 if(_slp->is_trace_alignment()) { 3208 print_depth(); tty->print(" %d SWPointer::scaled_iv: testing node: ", n->_idx); n->dump(); 3209 } 3210 } 3211 3212 void SWPointer::Tracer::scaled_iv_2(Node* n, int scale) { 3213 if(_slp->is_trace_alignment()) { 3214 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: FAILED since another _scale has been detected before", n->_idx); 3215 print_depth(); tty->print_cr(" \\ SWPointer::scaled_iv: _scale (%d) != 0", scale); 3216 } 3217 } 3218 3219 void SWPointer::Tracer::scaled_iv_3(Node* n, int scale) { 3220 if(_slp->is_trace_alignment()) { 3221 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: is iv, setting _scale = %d", n->_idx, scale); 3222 } 3223 } 3224 3225 void SWPointer::Tracer::scaled_iv_4(Node* n, int scale) { 3226 if(_slp->is_trace_alignment()) { 3227 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: Op_MulI PASSED, setting _scale = %d", n->_idx, scale); 3228 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv: in(1) is iv: ", n->in(1)->_idx); n->in(1)->dump(); 3229 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv: in(2) is Con: ", n->in(2)->_idx); n->in(2)->dump(); 3230 } 3231 } 3232 3233 void SWPointer::Tracer::scaled_iv_5(Node* n, int scale) { 3234 if(_slp->is_trace_alignment()) { 3235 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: Op_MulI PASSED, setting _scale = %d", n->_idx, scale); 3236 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv: in(2) is iv: ", n->in(2)->_idx); n->in(2)->dump(); 3237 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv: in(1) is Con: ", n->in(1)->_idx); n->in(1)->dump(); 3238 } 3239 } 3240 3241 void SWPointer::Tracer::scaled_iv_6(Node* n, int scale) { 3242 if(_slp->is_trace_alignment()) { 3243 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: Op_LShiftI PASSED, setting _scale = %d", n->_idx, scale); 3244 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv: in(1) is iv: ", n->in(1)->_idx); n->in(1)->dump(); 3245 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv: in(2) is Con: ", n->in(2)->_idx); n->in(2)->dump(); 3246 } 3247 } 3248 3249 void SWPointer::Tracer::scaled_iv_7(Node* n) { 3250 if(_slp->is_trace_alignment()) { 3251 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: Op_ConvI2L PASSED", n->_idx); 3252 print_depth(); tty->print_cr(" \\ SWPointer::scaled_iv: in(1) %d is scaled_iv_plus_offset: ", n->in(1)->_idx); 3253 inc_depth(); inc_depth(); 3254 print_depth(); n->in(1)->dump(); 3255 dec_depth(); dec_depth(); 3256 } 3257 } 3258 3259 void SWPointer::Tracer::scaled_iv_8(Node* n, SWPointer* tmp) { 3260 if(_slp->is_trace_alignment()) { 3261 print_depth(); tty->print(" %d SWPointer::scaled_iv: Op_LShiftL, creating tmp SWPointer: ", n->_idx); tmp->print(); 3262 } 3263 } 3264 3265 void SWPointer::Tracer::scaled_iv_9(Node* n, int scale, int _offset, int mult) { 3266 if(_slp->is_trace_alignment()) { 3267 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: Op_LShiftL PASSED, setting _scale = %d, _offset = %d", n->_idx, scale, _offset); 3268 print_depth(); tty->print_cr(" \\ SWPointer::scaled_iv: in(1) %d is scaled_iv_plus_offset, in(2) %d used to get mult = %d: _scale = %d, _offset = %d", 3269 n->in(1)->_idx, n->in(2)->_idx, mult, scale, _offset); 3270 inc_depth(); inc_depth(); 3271 print_depth(); n->in(1)->dump(); 3272 print_depth(); n->in(2)->dump(); 3273 dec_depth(); dec_depth(); 3274 } 3275 } 3276 3277 void SWPointer::Tracer::scaled_iv_10(Node* n) { 3278 if(_slp->is_trace_alignment()) { 3279 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: FAILED", n->_idx); 3280 } 3281 } 3282 3283 void SWPointer::Tracer::offset_plus_k_1(Node* n) { 3284 if(_slp->is_trace_alignment()) { 3285 print_depth(); tty->print(" %d SWPointer::offset_plus_k: testing node: ", n->_idx); n->dump(); 3286 } 3287 } 3288 3289 void SWPointer::Tracer::offset_plus_k_2(Node* n, int _offset) { 3290 if(_slp->is_trace_alignment()) { 3291 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: Op_ConI PASSED, setting _offset = %d", n->_idx, _offset); 3292 } 3293 } 3294 3295 void SWPointer::Tracer::offset_plus_k_3(Node* n, int _offset) { 3296 if(_slp->is_trace_alignment()) { 3297 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: Op_ConL PASSED, setting _offset = %d", n->_idx, _offset); 3298 } 3299 } 3300 3301 void SWPointer::Tracer::offset_plus_k_4(Node* n) { 3302 if(_slp->is_trace_alignment()) { 3303 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: FAILED", n->_idx); 3304 print_depth(); tty->print_cr(" \\ " JLONG_FORMAT " SWPointer::offset_plus_k: Op_ConL FAILED, k is too big", n->get_long()); 3305 } 3306 } 3307 3308 void SWPointer::Tracer::offset_plus_k_5(Node* n, Node* _invar) { 3309 if(_slp->is_trace_alignment()) { 3310 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: FAILED since another invariant has been detected before", n->_idx); 3311 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: _invar != NULL: ", _invar->_idx); _invar->dump(); 3312 } 3313 } 3314 3315 void SWPointer::Tracer::offset_plus_k_6(Node* n, Node* _invar, bool _negate_invar, int _offset) { 3316 if(_slp->is_trace_alignment()) { 3317 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: Op_AddI PASSED, setting _negate_invar = %d, _invar = %d, _offset = %d", 3318 n->_idx, _negate_invar, _invar->_idx, _offset); 3319 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(2) is Con: ", n->in(2)->_idx); n->in(2)->dump(); 3320 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(1) is invariant: ", _invar->_idx); _invar->dump(); 3321 } 3322 } 3323 3324 void SWPointer::Tracer::offset_plus_k_7(Node* n, Node* _invar, bool _negate_invar, int _offset) { 3325 if(_slp->is_trace_alignment()) { 3326 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: Op_AddI PASSED, setting _negate_invar = %d, _invar = %d, _offset = %d", 3327 n->_idx, _negate_invar, _invar->_idx, _offset); 3328 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(1) is Con: ", n->in(1)->_idx); n->in(1)->dump(); 3329 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(2) is invariant: ", _invar->_idx); _invar->dump(); 3330 } 3331 } 3332 3333 void SWPointer::Tracer::offset_plus_k_8(Node* n, Node* _invar, bool _negate_invar, int _offset) { 3334 if(_slp->is_trace_alignment()) { 3335 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: Op_SubI is PASSED, setting _negate_invar = %d, _invar = %d, _offset = %d", 3336 n->_idx, _negate_invar, _invar->_idx, _offset); 3337 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(2) is Con: ", n->in(2)->_idx); n->in(2)->dump(); 3338 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(1) is invariant: ", _invar->_idx); _invar->dump(); 3339 } 3340 } 3341 3342 void SWPointer::Tracer::offset_plus_k_9(Node* n, Node* _invar, bool _negate_invar, int _offset) { 3343 if(_slp->is_trace_alignment()) { 3344 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: Op_SubI PASSED, setting _negate_invar = %d, _invar = %d, _offset = %d", n->_idx, _negate_invar, _invar->_idx, _offset); 3345 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(1) is Con: ", n->in(1)->_idx); n->in(1)->dump(); 3346 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(2) is invariant: ", _invar->_idx); _invar->dump(); 3347 } 3348 } 3349 3350 void SWPointer::Tracer::offset_plus_k_10(Node* n, Node* _invar, bool _negate_invar, int _offset) { 3351 if(_slp->is_trace_alignment()) { 3352 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: PASSED, setting _negate_invar = %d, _invar = %d, _offset = %d", n->_idx, _negate_invar, _invar->_idx, _offset); 3353 print_depth(); tty->print_cr(" \\ %d SWPointer::offset_plus_k: is invariant", n->_idx); 3354 } 3355 } 3356 3357 void SWPointer::Tracer::offset_plus_k_11(Node* n) { 3358 if(_slp->is_trace_alignment()) { 3359 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: FAILED", n->_idx); 3360 } 3361 } 3362 3363 #endif 3364 // ========================= OrderedPair ===================== 3365 3366 const OrderedPair OrderedPair::initial; 3367 3368 // ========================= SWNodeInfo ===================== 3369 3370 const SWNodeInfo SWNodeInfo::initial; 3371 3372 3373 // ============================ DepGraph =========================== 3374 3375 //------------------------------make_node--------------------------- 3376 // Make a new dependence graph node for an ideal node. 3377 DepMem* DepGraph::make_node(Node* node) { 3378 DepMem* m = new (_arena) DepMem(node); 3379 if (node != NULL) { 3380 assert(_map.at_grow(node->_idx) == NULL, "one init only"); 3381 _map.at_put_grow(node->_idx, m); 3382 } 3383 return m; 3384 } 3385 3386 //------------------------------make_edge--------------------------- 3387 // Make a new dependence graph edge from dpred -> dsucc 3388 DepEdge* DepGraph::make_edge(DepMem* dpred, DepMem* dsucc) { 3389 DepEdge* e = new (_arena) DepEdge(dpred, dsucc, dsucc->in_head(), dpred->out_head()); 3390 dpred->set_out_head(e); 3391 dsucc->set_in_head(e); 3392 return e; 3393 } 3394 3395 // ========================== DepMem ======================== 3396 3397 //------------------------------in_cnt--------------------------- 3398 int DepMem::in_cnt() { 3399 int ct = 0; 3400 for (DepEdge* e = _in_head; e != NULL; e = e->next_in()) ct++; 3401 return ct; 3402 } 3403 3404 //------------------------------out_cnt--------------------------- 3405 int DepMem::out_cnt() { 3406 int ct = 0; 3407 for (DepEdge* e = _out_head; e != NULL; e = e->next_out()) ct++; 3408 return ct; 3409 } 3410 3411 //------------------------------print----------------------------- 3412 void DepMem::print() { 3413 #ifndef PRODUCT 3414 tty->print(" DepNode %d (", _node->_idx); 3415 for (DepEdge* p = _in_head; p != NULL; p = p->next_in()) { 3416 Node* pred = p->pred()->node(); 3417 tty->print(" %d", pred != NULL ? pred->_idx : 0); 3418 } 3419 tty->print(") ["); 3420 for (DepEdge* s = _out_head; s != NULL; s = s->next_out()) { 3421 Node* succ = s->succ()->node(); 3422 tty->print(" %d", succ != NULL ? succ->_idx : 0); 3423 } 3424 tty->print_cr(" ]"); 3425 #endif 3426 } 3427 3428 // =========================== DepEdge ========================= 3429 3430 //------------------------------DepPreds--------------------------- 3431 void DepEdge::print() { 3432 #ifndef PRODUCT 3433 tty->print_cr("DepEdge: %d [ %d ]", _pred->node()->_idx, _succ->node()->_idx); 3434 #endif 3435 } 3436 3437 // =========================== DepPreds ========================= 3438 // Iterator over predecessor edges in the dependence graph. 3439 3440 //------------------------------DepPreds--------------------------- 3441 DepPreds::DepPreds(Node* n, DepGraph& dg) { 3442 _n = n; 3443 _done = false; 3444 if (_n->is_Store() || _n->is_Load()) { 3445 _next_idx = MemNode::Address; 3446 _end_idx = n->req(); 3447 _dep_next = dg.dep(_n)->in_head(); 3448 } else if (_n->is_Mem()) { 3449 _next_idx = 0; 3450 _end_idx = 0; 3451 _dep_next = dg.dep(_n)->in_head(); 3452 } else { 3453 _next_idx = 1; 3454 _end_idx = _n->req(); 3455 _dep_next = NULL; 3456 } 3457 next(); 3458 } 3459 3460 //------------------------------next--------------------------- 3461 void DepPreds::next() { 3462 if (_dep_next != NULL) { 3463 _current = _dep_next->pred()->node(); 3464 _dep_next = _dep_next->next_in(); 3465 } else if (_next_idx < _end_idx) { 3466 _current = _n->in(_next_idx++); 3467 } else { 3468 _done = true; 3469 } 3470 } 3471 3472 // =========================== DepSuccs ========================= 3473 // Iterator over successor edges in the dependence graph. 3474 3475 //------------------------------DepSuccs--------------------------- 3476 DepSuccs::DepSuccs(Node* n, DepGraph& dg) { 3477 _n = n; 3478 _done = false; 3479 if (_n->is_Load()) { 3480 _next_idx = 0; 3481 _end_idx = _n->outcnt(); 3482 _dep_next = dg.dep(_n)->out_head(); 3483 } else if (_n->is_Mem() || _n->is_Phi() && _n->bottom_type() == Type::MEMORY) { 3484 _next_idx = 0; 3485 _end_idx = 0; 3486 _dep_next = dg.dep(_n)->out_head(); 3487 } else { 3488 _next_idx = 0; 3489 _end_idx = _n->outcnt(); 3490 _dep_next = NULL; 3491 } 3492 next(); 3493 } 3494 3495 //-------------------------------next--------------------------- 3496 void DepSuccs::next() { 3497 if (_dep_next != NULL) { 3498 _current = _dep_next->succ()->node(); 3499 _dep_next = _dep_next->next_out(); 3500 } else if (_next_idx < _end_idx) { 3501 _current = _n->raw_out(_next_idx++); 3502 } else { 3503 _done = true; 3504 } 3505 } 3506 3507 // 3508 // --------------------------------- vectorization/simd ----------------------------------- 3509 // 3510 bool SuperWord::same_origin_idx(Node* a, Node* b) const { 3511 return a != NULL && b != NULL && _clone_map.same_idx(a->_idx, b->_idx); 3512 } 3513 bool SuperWord::same_generation(Node* a, Node* b) const { 3514 return a != NULL && b != NULL && _clone_map.same_gen(a->_idx, b->_idx); 3515 } 3516 3517 Node* SuperWord::find_phi_for_mem_dep(LoadNode* ld) { 3518 assert(in_bb(ld), "must be in block"); 3519 if (_clone_map.gen(ld->_idx) == _ii_first) { 3520 #ifndef PRODUCT 3521 if (_vector_loop_debug) { 3522 tty->print_cr("SuperWord::find_phi_for_mem_dep _clone_map.gen(ld->_idx)=%d", 3523 _clone_map.gen(ld->_idx)); 3524 } 3525 #endif 3526 return NULL; //we think that any ld in the first gen being vectorizable 3527 } 3528 3529 Node* mem = ld->in(MemNode::Memory); 3530 if (mem->outcnt() <= 1) { 3531 // we don't want to remove the only edge from mem node to load 3532 #ifndef PRODUCT 3533 if (_vector_loop_debug) { 3534 tty->print_cr("SuperWord::find_phi_for_mem_dep input node %d to load %d has no other outputs and edge mem->load cannot be removed", 3535 mem->_idx, ld->_idx); 3536 ld->dump(); 3537 mem->dump(); 3538 } 3539 #endif 3540 return NULL; 3541 } 3542 if (!in_bb(mem) || same_generation(mem, ld)) { 3543 #ifndef PRODUCT 3544 if (_vector_loop_debug) { 3545 tty->print_cr("SuperWord::find_phi_for_mem_dep _clone_map.gen(mem->_idx)=%d", 3546 _clone_map.gen(mem->_idx)); 3547 } 3548 #endif 3549 return NULL; // does not depend on loop volatile node or depends on the same generation 3550 } 3551 3552 //otherwise first node should depend on mem-phi 3553 Node* first = first_node(ld); 3554 assert(first->is_Load(), "must be Load"); 3555 Node* phi = first->as_Load()->in(MemNode::Memory); 3556 if (!phi->is_Phi() || phi->bottom_type() != Type::MEMORY) { 3557 #ifndef PRODUCT 3558 if (_vector_loop_debug) { 3559 tty->print_cr("SuperWord::find_phi_for_mem_dep load is not vectorizable node, since it's `first` does not take input from mem phi"); 3560 ld->dump(); 3561 first->dump(); 3562 } 3563 #endif 3564 return NULL; 3565 } 3566 3567 Node* tail = 0; 3568 for (int m = 0; m < _mem_slice_head.length(); m++) { 3569 if (_mem_slice_head.at(m) == phi) { 3570 tail = _mem_slice_tail.at(m); 3571 } 3572 } 3573 if (tail == 0) { //test that found phi is in the list _mem_slice_head 3574 #ifndef PRODUCT 3575 if (_vector_loop_debug) { 3576 tty->print_cr("SuperWord::find_phi_for_mem_dep load %d is not vectorizable node, its phi %d is not _mem_slice_head", 3577 ld->_idx, phi->_idx); 3578 ld->dump(); 3579 phi->dump(); 3580 } 3581 #endif 3582 return NULL; 3583 } 3584 3585 // now all conditions are met 3586 return phi; 3587 } 3588 3589 Node* SuperWord::first_node(Node* nd) { 3590 for (int ii = 0; ii < _iteration_first.length(); ii++) { 3591 Node* nnn = _iteration_first.at(ii); 3592 if (same_origin_idx(nnn, nd)) { 3593 #ifndef PRODUCT 3594 if (_vector_loop_debug) { 3595 tty->print_cr("SuperWord::first_node: %d is the first iteration node for %d (_clone_map.idx(nnn->_idx) = %d)", 3596 nnn->_idx, nd->_idx, _clone_map.idx(nnn->_idx)); 3597 } 3598 #endif 3599 return nnn; 3600 } 3601 } 3602 3603 #ifndef PRODUCT 3604 if (_vector_loop_debug) { 3605 tty->print_cr("SuperWord::first_node: did not find first iteration node for %d (_clone_map.idx(nd->_idx)=%d)", 3606 nd->_idx, _clone_map.idx(nd->_idx)); 3607 } 3608 #endif 3609 return 0; 3610 } 3611 3612 Node* SuperWord::last_node(Node* nd) { 3613 for (int ii = 0; ii < _iteration_last.length(); ii++) { 3614 Node* nnn = _iteration_last.at(ii); 3615 if (same_origin_idx(nnn, nd)) { 3616 #ifndef PRODUCT 3617 if (_vector_loop_debug) { 3618 tty->print_cr("SuperWord::last_node _clone_map.idx(nnn->_idx)=%d, _clone_map.idx(nd->_idx)=%d", 3619 _clone_map.idx(nnn->_idx), _clone_map.idx(nd->_idx)); 3620 } 3621 #endif 3622 return nnn; 3623 } 3624 } 3625 return 0; 3626 } 3627 3628 int SuperWord::mark_generations() { 3629 Node *ii_err = 0, *tail_err; 3630 for (int i = 0; i < _mem_slice_head.length(); i++) { 3631 Node* phi = _mem_slice_head.at(i); 3632 assert(phi->is_Phi(), "must be phi"); 3633 3634 Node* tail = _mem_slice_tail.at(i); 3635 if (_ii_last == -1) { 3636 tail_err = tail; 3637 _ii_last = _clone_map.gen(tail->_idx); 3638 } 3639 else if (_ii_last != _clone_map.gen(tail->_idx)) { 3640 #ifndef PRODUCT 3641 if (TraceSuperWord && Verbose) { 3642 tty->print_cr("SuperWord::mark_generations _ii_last error - found different generations in two tail nodes "); 3643 tail->dump(); 3644 tail_err->dump(); 3645 } 3646 #endif 3647 return -1; 3648 } 3649 3650 // find first iteration in the loop 3651 for (DUIterator_Fast imax, i = phi->fast_outs(imax); i < imax; i++) { 3652 Node* ii = phi->fast_out(i); 3653 if (in_bb(ii) && ii->is_Store()) { // we speculate that normally Stores of one and one only generation have deps from mem phi 3654 if (_ii_first == -1) { 3655 ii_err = ii; 3656 _ii_first = _clone_map.gen(ii->_idx); 3657 } else if (_ii_first != _clone_map.gen(ii->_idx)) { 3658 #ifndef PRODUCT 3659 if (TraceSuperWord && Verbose) { 3660 tty->print_cr("SuperWord::mark_generations: _ii_first was found before and not equal to one in this node (%d)", _ii_first); 3661 ii->dump(); 3662 if (ii_err!= 0) { 3663 ii_err->dump(); 3664 } 3665 } 3666 #endif 3667 return -1; // this phi has Stores from different generations of unroll and cannot be simd/vectorized 3668 } 3669 } 3670 }//for (DUIterator_Fast imax, 3671 }//for (int i... 3672 3673 if (_ii_first == -1 || _ii_last == -1) { 3674 #ifndef PRODUCT 3675 if (TraceSuperWord && Verbose) { 3676 tty->print_cr("SuperWord::mark_generations unknown error, something vent wrong"); 3677 } 3678 #endif 3679 return -1; // something vent wrong 3680 } 3681 // collect nodes in the first and last generations 3682 assert(_iteration_first.length() == 0, "_iteration_first must be empty"); 3683 assert(_iteration_last.length() == 0, "_iteration_last must be empty"); 3684 for (int j = 0; j < _block.length(); j++) { 3685 Node* n = _block.at(j); 3686 node_idx_t gen = _clone_map.gen(n->_idx); 3687 if ((signed)gen == _ii_first) { 3688 _iteration_first.push(n); 3689 } else if ((signed)gen == _ii_last) { 3690 _iteration_last.push(n); 3691 } 3692 } 3693 3694 // building order of iterations 3695 if (_ii_order.length() == 0 && ii_err != 0) { 3696 assert(in_bb(ii_err) && ii_err->is_Store(), "should be Store in bb"); 3697 Node* nd = ii_err; 3698 while(_clone_map.gen(nd->_idx) != _ii_last) { 3699 _ii_order.push(_clone_map.gen(nd->_idx)); 3700 bool found = false; 3701 for (DUIterator_Fast imax, i = nd->fast_outs(imax); i < imax; i++) { 3702 Node* use = nd->fast_out(i); 3703 if (same_origin_idx(use, nd) && use->as_Store()->in(MemNode::Memory) == nd) { 3704 found = true; 3705 nd = use; 3706 break; 3707 } 3708 }//for 3709 3710 if (found == false) { 3711 #ifndef PRODUCT 3712 if (TraceSuperWord && Verbose) { 3713 tty->print_cr("SuperWord::mark_generations: Cannot build order of iterations - no dependent Store for %d", nd->_idx); 3714 } 3715 #endif 3716 _ii_order.clear(); 3717 return -1; 3718 } 3719 } //while 3720 _ii_order.push(_clone_map.gen(nd->_idx)); 3721 } 3722 3723 #ifndef PRODUCT 3724 if (_vector_loop_debug) { 3725 tty->print_cr("SuperWord::mark_generations"); 3726 tty->print_cr("First generation (%d) nodes:", _ii_first); 3727 for (int ii = 0; ii < _iteration_first.length(); ii++) _iteration_first.at(ii)->dump(); 3728 tty->print_cr("Last generation (%d) nodes:", _ii_last); 3729 for (int ii = 0; ii < _iteration_last.length(); ii++) _iteration_last.at(ii)->dump(); 3730 tty->print_cr(" "); 3731 3732 tty->print("SuperWord::List of generations: "); 3733 for (int jj = 0; jj < _ii_order.length(); ++jj) { 3734 tty->print("%d:%d ", jj, _ii_order.at(jj)); 3735 } 3736 tty->print_cr(" "); 3737 } 3738 #endif 3739 3740 return _ii_first; 3741 } 3742 3743 bool SuperWord::fix_commutative_inputs(Node* gold, Node* fix) { 3744 assert(gold->is_Add() && fix->is_Add() || gold->is_Mul() && fix->is_Mul(), "should be only Add or Mul nodes"); 3745 assert(same_origin_idx(gold, fix), "should be clones of the same node"); 3746 Node* gin1 = gold->in(1); 3747 Node* gin2 = gold->in(2); 3748 Node* fin1 = fix->in(1); 3749 Node* fin2 = fix->in(2); 3750 bool swapped = false; 3751 3752 if (in_bb(gin1) && in_bb(gin2) && in_bb(fin1) && in_bb(fin1)) { 3753 if (same_origin_idx(gin1, fin1) && 3754 same_origin_idx(gin2, fin2)) { 3755 return true; // nothing to fix 3756 } 3757 if (same_origin_idx(gin1, fin2) && 3758 same_origin_idx(gin2, fin1)) { 3759 fix->swap_edges(1, 2); 3760 swapped = true; 3761 } 3762 } 3763 // at least one input comes from outside of bb 3764 if (gin1->_idx == fin1->_idx) { 3765 return true; // nothing to fix 3766 } 3767 if (!swapped && (gin1->_idx == fin2->_idx || gin2->_idx == fin1->_idx)) { //swapping is expensive, check condition first 3768 fix->swap_edges(1, 2); 3769 swapped = true; 3770 } 3771 3772 if (swapped) { 3773 #ifndef PRODUCT 3774 if (_vector_loop_debug) { 3775 tty->print_cr("SuperWord::fix_commutative_inputs: fixed node %d", fix->_idx); 3776 } 3777 #endif 3778 return true; 3779 } 3780 3781 #ifndef PRODUCT 3782 if (TraceSuperWord && Verbose) { 3783 tty->print_cr("SuperWord::fix_commutative_inputs: cannot fix node %d", fix->_idx); 3784 } 3785 #endif 3786 return false; 3787 } 3788 3789 bool SuperWord::pack_parallel() { 3790 #ifndef PRODUCT 3791 if (_vector_loop_debug) { 3792 tty->print_cr("SuperWord::pack_parallel: START"); 3793 } 3794 #endif 3795 3796 _packset.clear(); 3797 3798 for (int ii = 0; ii < _iteration_first.length(); ii++) { 3799 Node* nd = _iteration_first.at(ii); 3800 if (in_bb(nd) && (nd->is_Load() || nd->is_Store() || nd->is_Add() || nd->is_Mul())) { 3801 Node_List* pk = new Node_List(); 3802 pk->push(nd); 3803 for (int gen = 1; gen < _ii_order.length(); ++gen) { 3804 for (int kk = 0; kk < _block.length(); kk++) { 3805 Node* clone = _block.at(kk); 3806 if (same_origin_idx(clone, nd) && 3807 _clone_map.gen(clone->_idx) == _ii_order.at(gen)) { 3808 if (nd->is_Add() || nd->is_Mul()) { 3809 fix_commutative_inputs(nd, clone); 3810 } 3811 pk->push(clone); 3812 if (pk->size() == 4) { 3813 _packset.append(pk); 3814 #ifndef PRODUCT 3815 if (_vector_loop_debug) { 3816 tty->print_cr("SuperWord::pack_parallel: added pack "); 3817 pk->dump(); 3818 } 3819 #endif 3820 if (_clone_map.gen(clone->_idx) != _ii_last) { 3821 pk = new Node_List(); 3822 } 3823 } 3824 break; 3825 } 3826 } 3827 }//for 3828 }//if 3829 }//for 3830 3831 #ifndef PRODUCT 3832 if (_vector_loop_debug) { 3833 tty->print_cr("SuperWord::pack_parallel: END"); 3834 } 3835 #endif 3836 3837 return true; 3838 } 3839 3840 bool SuperWord::hoist_loads_in_graph() { 3841 GrowableArray<Node*> loads; 3842 3843 #ifndef PRODUCT 3844 if (_vector_loop_debug) { 3845 tty->print_cr("SuperWord::hoist_loads_in_graph: total number _mem_slice_head.length() = %d", _mem_slice_head.length()); 3846 } 3847 #endif 3848 3849 for (int i = 0; i < _mem_slice_head.length(); i++) { 3850 Node* n = _mem_slice_head.at(i); 3851 if ( !in_bb(n) || !n->is_Phi() || n->bottom_type() != Type::MEMORY) { 3852 #ifndef PRODUCT 3853 if (TraceSuperWord && Verbose) { 3854 tty->print_cr("SuperWord::hoist_loads_in_graph: skipping unexpected node n=%d", n->_idx); 3855 } 3856 #endif 3857 continue; 3858 } 3859 3860 #ifndef PRODUCT 3861 if (_vector_loop_debug) { 3862 tty->print_cr("SuperWord::hoist_loads_in_graph: processing phi %d = _mem_slice_head.at(%d);", n->_idx, i); 3863 } 3864 #endif 3865 3866 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { 3867 Node* ld = n->fast_out(i); 3868 if (ld->is_Load() && ld->as_Load()->in(MemNode::Memory) == n && in_bb(ld)) { 3869 for (int i = 0; i < _block.length(); i++) { 3870 Node* ld2 = _block.at(i); 3871 if (ld2->is_Load() && same_origin_idx(ld, ld2) && 3872 !same_generation(ld, ld2)) { // <= do not collect the first generation ld 3873 #ifndef PRODUCT 3874 if (_vector_loop_debug) { 3875 tty->print_cr("SuperWord::hoist_loads_in_graph: will try to hoist load ld2->_idx=%d, cloned from %d (ld->_idx=%d)", 3876 ld2->_idx, _clone_map.idx(ld->_idx), ld->_idx); 3877 } 3878 #endif 3879 // could not do on-the-fly, since iterator is immutable 3880 loads.push(ld2); 3881 } 3882 }// for 3883 }//if 3884 }//for (DUIterator_Fast imax, 3885 }//for (int i = 0; i 3886 3887 for (int i = 0; i < loads.length(); i++) { 3888 LoadNode* ld = loads.at(i)->as_Load(); 3889 Node* phi = find_phi_for_mem_dep(ld); 3890 if (phi != NULL) { 3891 #ifndef PRODUCT 3892 if (_vector_loop_debug) { 3893 tty->print_cr("SuperWord::hoist_loads_in_graph replacing MemNode::Memory(%d) edge in %d with one from %d", 3894 MemNode::Memory, ld->_idx, phi->_idx); 3895 } 3896 #endif 3897 _igvn.replace_input_of(ld, MemNode::Memory, phi); 3898 } 3899 }//for 3900 3901 restart(); // invalidate all basic structures, since we rebuilt the graph 3902 3903 #ifndef PRODUCT 3904 if (TraceSuperWord && Verbose) { 3905 tty->print_cr("\nSuperWord::hoist_loads_in_graph() the graph was rebuilt, all structures invalidated and need rebuild"); 3906 } 3907 #endif 3908 return true; 3909 } 3910