1 /* 2 * Copyright (c) 2007, 2010, 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/divnode.hpp" 31 #include "opto/matcher.hpp" 32 #include "opto/memnode.hpp" 33 #include "opto/mulnode.hpp" 34 #include "opto/opcodes.hpp" 35 #include "opto/superword.hpp" 36 #include "opto/vectornode.hpp" 37 38 // 39 // S U P E R W O R D T R A N S F O R M 40 //============================================================================= 41 42 //------------------------------SuperWord--------------------------- 43 SuperWord::SuperWord(PhaseIdealLoop* phase) : 44 _phase(phase), 45 _igvn(phase->_igvn), 46 _arena(phase->C->comp_arena()), 47 _packset(arena(), 8, 0, NULL), // packs for the current block 48 _bb_idx(arena(), (int)(1.10 * phase->C->unique()), 0, 0), // node idx to index in bb 49 _block(arena(), 8, 0, NULL), // nodes in current block 50 _data_entry(arena(), 8, 0, NULL), // nodes with all inputs from outside 51 _mem_slice_head(arena(), 8, 0, NULL), // memory slice heads 52 _mem_slice_tail(arena(), 8, 0, NULL), // memory slice tails 53 _node_info(arena(), 8, 0, SWNodeInfo::initial), // info needed per node 54 _align_to_ref(NULL), // memory reference to align vectors to 55 _disjoint_ptrs(arena(), 8, 0, OrderedPair::initial), // runtime disambiguated pointer pairs 56 _dg(_arena), // dependence graph 57 _visited(arena()), // visited node set 58 _post_visited(arena()), // post visited node set 59 _n_idx_list(arena(), 8), // scratch list of (node,index) pairs 60 _stk(arena(), 8, 0, NULL), // scratch stack of nodes 61 _nlist(arena(), 8, 0, NULL), // scratch list of nodes 62 _lpt(NULL), // loop tree node 63 _lp(NULL), // LoopNode 64 _bb(NULL), // basic block 65 _iv(NULL) // induction var 66 {} 67 68 //------------------------------transform_loop--------------------------- 69 void SuperWord::transform_loop(IdealLoopTree* lpt) { 70 assert(lpt->_head->is_CountedLoop(), "must be"); 71 CountedLoopNode *cl = lpt->_head->as_CountedLoop(); 72 73 if (!cl->is_main_loop() ) return; // skip normal, pre, and post loops 74 75 // Check for no control flow in body (other than exit) 76 Node *cl_exit = cl->loopexit(); 77 if (cl_exit->in(0) != lpt->_head) return; 78 79 // Make sure the are no extra control users of the loop backedge 80 if (cl->back_control()->outcnt() != 1) { 81 return; 82 } 83 84 // Check for pre-loop ending with CountedLoopEnd(Bool(Cmp(x,Opaque1(limit)))) 85 CountedLoopEndNode* pre_end = get_pre_loop_end(cl); 86 if (pre_end == NULL) return; 87 Node *pre_opaq1 = pre_end->limit(); 88 if (pre_opaq1->Opcode() != Op_Opaque1) return; 89 90 // Do vectors exist on this architecture? 91 if (vector_width_in_bytes() == 0) return; 92 93 init(); // initialize data structures 94 95 set_lpt(lpt); 96 set_lp(cl); 97 98 // For now, define one block which is the entire loop body 99 set_bb(cl); 100 101 assert(_packset.length() == 0, "packset must be empty"); 102 SLP_extract(); 103 } 104 105 //------------------------------SLP_extract--------------------------- 106 // Extract the superword level parallelism 107 // 108 // 1) A reverse post-order of nodes in the block is constructed. By scanning 109 // this list from first to last, all definitions are visited before their uses. 110 // 111 // 2) A point-to-point dependence graph is constructed between memory references. 112 // This simplies the upcoming "independence" checker. 113 // 114 // 3) The maximum depth in the node graph from the beginning of the block 115 // to each node is computed. This is used to prune the graph search 116 // in the independence checker. 117 // 118 // 4) For integer types, the necessary bit width is propagated backwards 119 // from stores to allow packed operations on byte, char, and short 120 // integers. This reverses the promotion to type "int" that javac 121 // did for operations like: char c1,c2,c3; c1 = c2 + c3. 122 // 123 // 5) One of the memory references is picked to be an aligned vector reference. 124 // The pre-loop trip count is adjusted to align this reference in the 125 // unrolled body. 126 // 127 // 6) The initial set of pack pairs is seeded with memory references. 128 // 129 // 7) The set of pack pairs is extended by following use->def and def->use links. 130 // 131 // 8) The pairs are combined into vector sized packs. 132 // 133 // 9) Reorder the memory slices to co-locate members of the memory packs. 134 // 135 // 10) Generate ideal vector nodes for the final set of packs and where necessary, 136 // inserting scalar promotion, vector creation from multiple scalars, and 137 // extraction of scalar values from vectors. 138 // 139 void SuperWord::SLP_extract() { 140 141 // Ready the block 142 143 construct_bb(); 144 145 dependence_graph(); 146 147 compute_max_depth(); 148 149 compute_vector_element_type(); 150 151 // Attempt vectorization 152 153 find_adjacent_refs(); 154 155 extend_packlist(); 156 157 combine_packs(); 158 159 construct_my_pack_map(); 160 161 filter_packs(); 162 163 schedule(); 164 165 output(); 166 } 167 168 //------------------------------find_adjacent_refs--------------------------- 169 // Find the adjacent memory references and create pack pairs for them. 170 // This is the initial set of packs that will then be extended by 171 // following use->def and def->use links. The align positions are 172 // assigned relative to the reference "align_to_ref" 173 void SuperWord::find_adjacent_refs() { 174 // Get list of memory operations 175 Node_List memops; 176 for (int i = 0; i < _block.length(); i++) { 177 Node* n = _block.at(i); 178 if (n->is_Mem() && in_bb(n) && 179 is_java_primitive(n->as_Mem()->memory_type())) { 180 int align = memory_alignment(n->as_Mem(), 0); 181 if (align != bottom_align) { 182 memops.push(n); 183 } 184 } 185 } 186 if (memops.size() == 0) return; 187 188 // Find a memory reference to align to. The pre-loop trip count 189 // is modified to align this reference to a vector-aligned address 190 find_align_to_ref(memops); 191 if (align_to_ref() == NULL) return; 192 193 SWPointer align_to_ref_p(align_to_ref(), this); 194 int offset = align_to_ref_p.offset_in_bytes(); 195 int scale = align_to_ref_p.scale_in_bytes(); 196 int vw = vector_width_in_bytes(); 197 int stride_sign = (scale * iv_stride()) > 0 ? 1 : -1; 198 int iv_adjustment = (stride_sign * vw - (offset % vw)) % vw; 199 200 #ifndef PRODUCT 201 if (TraceSuperWord) 202 tty->print_cr("\noffset = %d iv_adjustment = %d elt_align = %d scale = %d iv_stride = %d", 203 offset, iv_adjustment, align_to_ref_p.memory_size(), align_to_ref_p.scale_in_bytes(), iv_stride()); 204 #endif 205 206 // Set alignment relative to "align_to_ref" 207 for (int i = memops.size() - 1; i >= 0; i--) { 208 MemNode* s = memops.at(i)->as_Mem(); 209 SWPointer p2(s, this); 210 if (p2.comparable(align_to_ref_p)) { 211 int align = memory_alignment(s, iv_adjustment); 212 set_alignment(s, align); 213 } else { 214 memops.remove(i); 215 } 216 } 217 218 // Create initial pack pairs of memory operations 219 for (uint i = 0; i < memops.size(); i++) { 220 Node* s1 = memops.at(i); 221 for (uint j = 0; j < memops.size(); j++) { 222 Node* s2 = memops.at(j); 223 if (s1 != s2 && are_adjacent_refs(s1, s2)) { 224 int align = alignment(s1); 225 if (stmts_can_pack(s1, s2, align)) { 226 Node_List* pair = new Node_List(); 227 pair->push(s1); 228 pair->push(s2); 229 _packset.append(pair); 230 } 231 } 232 } 233 } 234 235 #ifndef PRODUCT 236 if (TraceSuperWord) { 237 tty->print_cr("\nAfter find_adjacent_refs"); 238 print_packset(); 239 } 240 #endif 241 } 242 243 //------------------------------find_align_to_ref--------------------------- 244 // Find a memory reference to align the loop induction variable to. 245 // Looks first at stores then at loads, looking for a memory reference 246 // with the largest number of references similar to it. 247 void SuperWord::find_align_to_ref(Node_List &memops) { 248 GrowableArray<int> cmp_ct(arena(), memops.size(), memops.size(), 0); 249 250 // Count number of comparable memory ops 251 for (uint i = 0; i < memops.size(); i++) { 252 MemNode* s1 = memops.at(i)->as_Mem(); 253 SWPointer p1(s1, this); 254 // Discard if pre loop can't align this reference 255 if (!ref_is_alignable(p1)) { 256 *cmp_ct.adr_at(i) = 0; 257 continue; 258 } 259 for (uint j = i+1; j < memops.size(); j++) { 260 MemNode* s2 = memops.at(j)->as_Mem(); 261 if (isomorphic(s1, s2)) { 262 SWPointer p2(s2, this); 263 if (p1.comparable(p2)) { 264 (*cmp_ct.adr_at(i))++; 265 (*cmp_ct.adr_at(j))++; 266 } 267 } 268 } 269 } 270 271 // Find Store (or Load) with the greatest number of "comparable" references 272 int max_ct = 0; 273 int max_idx = -1; 274 int min_size = max_jint; 275 int min_iv_offset = max_jint; 276 for (uint j = 0; j < memops.size(); j++) { 277 MemNode* s = memops.at(j)->as_Mem(); 278 if (s->is_Store()) { 279 SWPointer p(s, this); 280 if (cmp_ct.at(j) > max_ct || 281 cmp_ct.at(j) == max_ct && (data_size(s) < min_size || 282 data_size(s) == min_size && 283 p.offset_in_bytes() < min_iv_offset)) { 284 max_ct = cmp_ct.at(j); 285 max_idx = j; 286 min_size = data_size(s); 287 min_iv_offset = p.offset_in_bytes(); 288 } 289 } 290 } 291 // If no stores, look at loads 292 if (max_ct == 0) { 293 for (uint j = 0; j < memops.size(); j++) { 294 MemNode* s = memops.at(j)->as_Mem(); 295 if (s->is_Load()) { 296 SWPointer p(s, this); 297 if (cmp_ct.at(j) > max_ct || 298 cmp_ct.at(j) == max_ct && (data_size(s) < min_size || 299 data_size(s) == min_size && 300 p.offset_in_bytes() < min_iv_offset)) { 301 max_ct = cmp_ct.at(j); 302 max_idx = j; 303 min_size = data_size(s); 304 min_iv_offset = p.offset_in_bytes(); 305 } 306 } 307 } 308 } 309 310 if (max_ct > 0) 311 set_align_to_ref(memops.at(max_idx)->as_Mem()); 312 313 #ifndef PRODUCT 314 if (TraceSuperWord && Verbose) { 315 tty->print_cr("\nVector memops after find_align_to_refs"); 316 for (uint i = 0; i < memops.size(); i++) { 317 MemNode* s = memops.at(i)->as_Mem(); 318 s->dump(); 319 } 320 } 321 #endif 322 } 323 324 //------------------------------ref_is_alignable--------------------------- 325 // Can the preloop align the reference to position zero in the vector? 326 bool SuperWord::ref_is_alignable(SWPointer& p) { 327 if (!p.has_iv()) { 328 return true; // no induction variable 329 } 330 CountedLoopEndNode* pre_end = get_pre_loop_end(lp()->as_CountedLoop()); 331 assert(pre_end->stride_is_con(), "pre loop stride is constant"); 332 int preloop_stride = pre_end->stride_con(); 333 334 int span = preloop_stride * p.scale_in_bytes(); 335 336 // Stride one accesses are alignable. 337 if (ABS(span) == p.memory_size()) 338 return true; 339 340 // If initial offset from start of object is computable, 341 // compute alignment within the vector. 342 int vw = vector_width_in_bytes(); 343 if (vw % span == 0) { 344 Node* init_nd = pre_end->init_trip(); 345 if (init_nd->is_Con() && p.invar() == NULL) { 346 int init = init_nd->bottom_type()->is_int()->get_con(); 347 348 int init_offset = init * p.scale_in_bytes() + p.offset_in_bytes(); 349 assert(init_offset >= 0, "positive offset from object start"); 350 351 if (span > 0) { 352 return (vw - (init_offset % vw)) % span == 0; 353 } else { 354 assert(span < 0, "nonzero stride * scale"); 355 return (init_offset % vw) % -span == 0; 356 } 357 } 358 } 359 return false; 360 } 361 362 //---------------------------dependence_graph--------------------------- 363 // Construct dependency graph. 364 // Add dependence edges to load/store nodes for memory dependence 365 // A.out()->DependNode.in(1) and DependNode.out()->B.prec(x) 366 void SuperWord::dependence_graph() { 367 // First, assign a dependence node to each memory node 368 for (int i = 0; i < _block.length(); i++ ) { 369 Node *n = _block.at(i); 370 if (n->is_Mem() || n->is_Phi() && n->bottom_type() == Type::MEMORY) { 371 _dg.make_node(n); 372 } 373 } 374 375 // For each memory slice, create the dependences 376 for (int i = 0; i < _mem_slice_head.length(); i++) { 377 Node* n = _mem_slice_head.at(i); 378 Node* n_tail = _mem_slice_tail.at(i); 379 380 // Get slice in predecessor order (last is first) 381 mem_slice_preds(n_tail, n, _nlist); 382 383 // Make the slice dependent on the root 384 DepMem* slice = _dg.dep(n); 385 _dg.make_edge(_dg.root(), slice); 386 387 // Create a sink for the slice 388 DepMem* slice_sink = _dg.make_node(NULL); 389 _dg.make_edge(slice_sink, _dg.tail()); 390 391 // Now visit each pair of memory ops, creating the edges 392 for (int j = _nlist.length() - 1; j >= 0 ; j--) { 393 Node* s1 = _nlist.at(j); 394 395 // If no dependency yet, use slice 396 if (_dg.dep(s1)->in_cnt() == 0) { 397 _dg.make_edge(slice, s1); 398 } 399 SWPointer p1(s1->as_Mem(), this); 400 bool sink_dependent = true; 401 for (int k = j - 1; k >= 0; k--) { 402 Node* s2 = _nlist.at(k); 403 if (s1->is_Load() && s2->is_Load()) 404 continue; 405 SWPointer p2(s2->as_Mem(), this); 406 407 int cmp = p1.cmp(p2); 408 if (SuperWordRTDepCheck && 409 p1.base() != p2.base() && p1.valid() && p2.valid()) { 410 // Create a runtime check to disambiguate 411 OrderedPair pp(p1.base(), p2.base()); 412 _disjoint_ptrs.append_if_missing(pp); 413 } else if (!SWPointer::not_equal(cmp)) { 414 // Possibly same address 415 _dg.make_edge(s1, s2); 416 sink_dependent = false; 417 } 418 } 419 if (sink_dependent) { 420 _dg.make_edge(s1, slice_sink); 421 } 422 } 423 #ifndef PRODUCT 424 if (TraceSuperWord) { 425 tty->print_cr("\nDependence graph for slice: %d", n->_idx); 426 for (int q = 0; q < _nlist.length(); q++) { 427 _dg.print(_nlist.at(q)); 428 } 429 tty->cr(); 430 } 431 #endif 432 _nlist.clear(); 433 } 434 435 #ifndef PRODUCT 436 if (TraceSuperWord) { 437 tty->print_cr("\ndisjoint_ptrs: %s", _disjoint_ptrs.length() > 0 ? "" : "NONE"); 438 for (int r = 0; r < _disjoint_ptrs.length(); r++) { 439 _disjoint_ptrs.at(r).print(); 440 tty->cr(); 441 } 442 tty->cr(); 443 } 444 #endif 445 } 446 447 //---------------------------mem_slice_preds--------------------------- 448 // Return a memory slice (node list) in predecessor order starting at "start" 449 void SuperWord::mem_slice_preds(Node* start, Node* stop, GrowableArray<Node*> &preds) { 450 assert(preds.length() == 0, "start empty"); 451 Node* n = start; 452 Node* prev = NULL; 453 while (true) { 454 assert(in_bb(n), "must be in block"); 455 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { 456 Node* out = n->fast_out(i); 457 if (out->is_Load()) { 458 if (in_bb(out)) { 459 preds.push(out); 460 } 461 } else { 462 // FIXME 463 if (out->is_MergeMem() && !in_bb(out)) { 464 // Either unrolling is causing a memory edge not to disappear, 465 // or need to run igvn.optimize() again before SLP 466 } else if (out->is_Phi() && out->bottom_type() == Type::MEMORY && !in_bb(out)) { 467 // Ditto. Not sure what else to check further. 468 } else if (out->Opcode() == Op_StoreCM && out->in(MemNode::OopStore) == n) { 469 // StoreCM has an input edge used as a precedence edge. 470 // Maybe an issue when oop stores are vectorized. 471 } else { 472 assert(out == prev || prev == NULL, "no branches off of store slice"); 473 } 474 } 475 } 476 if (n == stop) break; 477 preds.push(n); 478 prev = n; 479 n = n->in(MemNode::Memory); 480 } 481 } 482 483 //------------------------------stmts_can_pack--------------------------- 484 // Can s1 and s2 be in a pack with s1 immediately preceding s2 and 485 // s1 aligned at "align" 486 bool SuperWord::stmts_can_pack(Node* s1, Node* s2, int align) { 487 488 // Do not use superword for non-primitives 489 if((s1->is_Mem() && !is_java_primitive(s1->as_Mem()->memory_type())) || 490 (s2->is_Mem() && !is_java_primitive(s2->as_Mem()->memory_type()))) 491 return false; 492 493 if (isomorphic(s1, s2)) { 494 if (independent(s1, s2)) { 495 if (!exists_at(s1, 0) && !exists_at(s2, 1)) { 496 if (!s1->is_Mem() || are_adjacent_refs(s1, s2)) { 497 int s1_align = alignment(s1); 498 int s2_align = alignment(s2); 499 if (s1_align == top_align || s1_align == align) { 500 if (s2_align == top_align || s2_align == align + data_size(s1)) { 501 return true; 502 } 503 } 504 } 505 } 506 } 507 } 508 return false; 509 } 510 511 //------------------------------exists_at--------------------------- 512 // Does s exist in a pack at position pos? 513 bool SuperWord::exists_at(Node* s, uint pos) { 514 for (int i = 0; i < _packset.length(); i++) { 515 Node_List* p = _packset.at(i); 516 if (p->at(pos) == s) { 517 return true; 518 } 519 } 520 return false; 521 } 522 523 //------------------------------are_adjacent_refs--------------------------- 524 // Is s1 immediately before s2 in memory? 525 bool SuperWord::are_adjacent_refs(Node* s1, Node* s2) { 526 if (!s1->is_Mem() || !s2->is_Mem()) return false; 527 if (!in_bb(s1) || !in_bb(s2)) return false; 528 529 // Do not use superword for non-primitives 530 if (!is_java_primitive(s1->as_Mem()->memory_type()) || 531 !is_java_primitive(s2->as_Mem()->memory_type())) { 532 return false; 533 } 534 535 // FIXME - co_locate_pack fails on Stores in different mem-slices, so 536 // only pack memops that are in the same alias set until that's fixed. 537 if (_phase->C->get_alias_index(s1->as_Mem()->adr_type()) != 538 _phase->C->get_alias_index(s2->as_Mem()->adr_type())) 539 return false; 540 SWPointer p1(s1->as_Mem(), this); 541 SWPointer p2(s2->as_Mem(), this); 542 if (p1.base() != p2.base() || !p1.comparable(p2)) return false; 543 int diff = p2.offset_in_bytes() - p1.offset_in_bytes(); 544 return diff == data_size(s1); 545 } 546 547 //------------------------------isomorphic--------------------------- 548 // Are s1 and s2 similar? 549 bool SuperWord::isomorphic(Node* s1, Node* s2) { 550 if (s1->Opcode() != s2->Opcode()) return false; 551 if (s1->req() != s2->req()) return false; 552 if (s1->in(0) != s2->in(0)) return false; 553 if (velt_type(s1) != velt_type(s2)) return false; 554 return true; 555 } 556 557 //------------------------------independent--------------------------- 558 // Is there no data path from s1 to s2 or s2 to s1? 559 bool SuperWord::independent(Node* s1, Node* s2) { 560 // assert(s1->Opcode() == s2->Opcode(), "check isomorphic first"); 561 int d1 = depth(s1); 562 int d2 = depth(s2); 563 if (d1 == d2) return s1 != s2; 564 Node* deep = d1 > d2 ? s1 : s2; 565 Node* shallow = d1 > d2 ? s2 : s1; 566 567 visited_clear(); 568 569 return independent_path(shallow, deep); 570 } 571 572 //------------------------------independent_path------------------------------ 573 // Helper for independent 574 bool SuperWord::independent_path(Node* shallow, Node* deep, uint dp) { 575 if (dp >= 1000) return false; // stop deep recursion 576 visited_set(deep); 577 int shal_depth = depth(shallow); 578 assert(shal_depth <= depth(deep), "must be"); 579 for (DepPreds preds(deep, _dg); !preds.done(); preds.next()) { 580 Node* pred = preds.current(); 581 if (in_bb(pred) && !visited_test(pred)) { 582 if (shallow == pred) { 583 return false; 584 } 585 if (shal_depth < depth(pred) && !independent_path(shallow, pred, dp+1)) { 586 return false; 587 } 588 } 589 } 590 return true; 591 } 592 593 //------------------------------set_alignment--------------------------- 594 void SuperWord::set_alignment(Node* s1, Node* s2, int align) { 595 set_alignment(s1, align); 596 set_alignment(s2, align + data_size(s1)); 597 } 598 599 //------------------------------data_size--------------------------- 600 int SuperWord::data_size(Node* s) { 601 const Type* t = velt_type(s); 602 BasicType bt = t->array_element_basic_type(); 603 int bsize = type2aelembytes(bt); 604 assert(bsize != 0, "valid size"); 605 return bsize; 606 } 607 608 //------------------------------extend_packlist--------------------------- 609 // Extend packset by following use->def and def->use links from pack members. 610 void SuperWord::extend_packlist() { 611 bool changed; 612 do { 613 changed = false; 614 for (int i = 0; i < _packset.length(); i++) { 615 Node_List* p = _packset.at(i); 616 changed |= follow_use_defs(p); 617 changed |= follow_def_uses(p); 618 } 619 } while (changed); 620 621 #ifndef PRODUCT 622 if (TraceSuperWord) { 623 tty->print_cr("\nAfter extend_packlist"); 624 print_packset(); 625 } 626 #endif 627 } 628 629 //------------------------------follow_use_defs--------------------------- 630 // Extend the packset by visiting operand definitions of nodes in pack p 631 bool SuperWord::follow_use_defs(Node_List* p) { 632 Node* s1 = p->at(0); 633 Node* s2 = p->at(1); 634 assert(p->size() == 2, "just checking"); 635 assert(s1->req() == s2->req(), "just checking"); 636 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); 637 638 if (s1->is_Load()) return false; 639 640 int align = alignment(s1); 641 bool changed = false; 642 int start = s1->is_Store() ? MemNode::ValueIn : 1; 643 int end = s1->is_Store() ? MemNode::ValueIn+1 : s1->req(); 644 for (int j = start; j < end; j++) { 645 Node* t1 = s1->in(j); 646 Node* t2 = s2->in(j); 647 if (!in_bb(t1) || !in_bb(t2)) 648 continue; 649 if (stmts_can_pack(t1, t2, align)) { 650 if (est_savings(t1, t2) >= 0) { 651 Node_List* pair = new Node_List(); 652 pair->push(t1); 653 pair->push(t2); 654 _packset.append(pair); 655 set_alignment(t1, t2, align); 656 changed = true; 657 } 658 } 659 } 660 return changed; 661 } 662 663 //------------------------------follow_def_uses--------------------------- 664 // Extend the packset by visiting uses of nodes in pack p 665 bool SuperWord::follow_def_uses(Node_List* p) { 666 bool changed = false; 667 Node* s1 = p->at(0); 668 Node* s2 = p->at(1); 669 assert(p->size() == 2, "just checking"); 670 assert(s1->req() == s2->req(), "just checking"); 671 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); 672 673 if (s1->is_Store()) return false; 674 675 int align = alignment(s1); 676 int savings = -1; 677 Node* u1 = NULL; 678 Node* u2 = NULL; 679 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { 680 Node* t1 = s1->fast_out(i); 681 if (!in_bb(t1)) continue; 682 for (DUIterator_Fast jmax, j = s2->fast_outs(jmax); j < jmax; j++) { 683 Node* t2 = s2->fast_out(j); 684 if (!in_bb(t2)) continue; 685 if (!opnd_positions_match(s1, t1, s2, t2)) 686 continue; 687 if (stmts_can_pack(t1, t2, align)) { 688 int my_savings = est_savings(t1, t2); 689 if (my_savings > savings) { 690 savings = my_savings; 691 u1 = t1; 692 u2 = t2; 693 } 694 } 695 } 696 } 697 if (savings >= 0) { 698 Node_List* pair = new Node_List(); 699 pair->push(u1); 700 pair->push(u2); 701 _packset.append(pair); 702 set_alignment(u1, u2, align); 703 changed = true; 704 } 705 return changed; 706 } 707 708 //---------------------------opnd_positions_match------------------------- 709 // Is the use of d1 in u1 at the same operand position as d2 in u2? 710 bool SuperWord::opnd_positions_match(Node* d1, Node* u1, Node* d2, Node* u2) { 711 uint ct = u1->req(); 712 if (ct != u2->req()) return false; 713 uint i1 = 0; 714 uint i2 = 0; 715 do { 716 for (i1++; i1 < ct; i1++) if (u1->in(i1) == d1) break; 717 for (i2++; i2 < ct; i2++) if (u2->in(i2) == d2) break; 718 if (i1 != i2) { 719 return false; 720 } 721 } while (i1 < ct); 722 return true; 723 } 724 725 //------------------------------est_savings--------------------------- 726 // Estimate the savings from executing s1 and s2 as a pack 727 int SuperWord::est_savings(Node* s1, Node* s2) { 728 int save = 2 - 1; // 2 operations per instruction in packed form 729 730 // inputs 731 for (uint i = 1; i < s1->req(); i++) { 732 Node* x1 = s1->in(i); 733 Node* x2 = s2->in(i); 734 if (x1 != x2) { 735 if (are_adjacent_refs(x1, x2)) { 736 save += adjacent_profit(x1, x2); 737 } else if (!in_packset(x1, x2)) { 738 save -= pack_cost(2); 739 } else { 740 save += unpack_cost(2); 741 } 742 } 743 } 744 745 // uses of result 746 uint ct = 0; 747 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { 748 Node* s1_use = s1->fast_out(i); 749 for (int j = 0; j < _packset.length(); j++) { 750 Node_List* p = _packset.at(j); 751 if (p->at(0) == s1_use) { 752 for (DUIterator_Fast kmax, k = s2->fast_outs(kmax); k < kmax; k++) { 753 Node* s2_use = s2->fast_out(k); 754 if (p->at(p->size()-1) == s2_use) { 755 ct++; 756 if (are_adjacent_refs(s1_use, s2_use)) { 757 save += adjacent_profit(s1_use, s2_use); 758 } 759 } 760 } 761 } 762 } 763 } 764 765 if (ct < s1->outcnt()) save += unpack_cost(1); 766 if (ct < s2->outcnt()) save += unpack_cost(1); 767 768 return save; 769 } 770 771 //------------------------------costs--------------------------- 772 int SuperWord::adjacent_profit(Node* s1, Node* s2) { return 2; } 773 int SuperWord::pack_cost(int ct) { return ct; } 774 int SuperWord::unpack_cost(int ct) { return ct; } 775 776 //------------------------------combine_packs--------------------------- 777 // Combine packs A and B with A.last == B.first into A.first..,A.last,B.second,..B.last 778 void SuperWord::combine_packs() { 779 bool changed; 780 do { 781 changed = false; 782 for (int i = 0; i < _packset.length(); i++) { 783 Node_List* p1 = _packset.at(i); 784 if (p1 == NULL) continue; 785 for (int j = 0; j < _packset.length(); j++) { 786 Node_List* p2 = _packset.at(j); 787 if (p2 == NULL) continue; 788 if (p1->at(p1->size()-1) == p2->at(0)) { 789 for (uint k = 1; k < p2->size(); k++) { 790 p1->push(p2->at(k)); 791 } 792 _packset.at_put(j, NULL); 793 changed = true; 794 } 795 } 796 } 797 } while (changed); 798 799 for (int i = _packset.length() - 1; i >= 0; i--) { 800 Node_List* p1 = _packset.at(i); 801 if (p1 == NULL) { 802 _packset.remove_at(i); 803 } 804 } 805 806 #ifndef PRODUCT 807 if (TraceSuperWord) { 808 tty->print_cr("\nAfter combine_packs"); 809 print_packset(); 810 } 811 #endif 812 } 813 814 //-----------------------------construct_my_pack_map-------------------------- 815 // Construct the map from nodes to packs. Only valid after the 816 // point where a node is only in one pack (after combine_packs). 817 void SuperWord::construct_my_pack_map() { 818 Node_List* rslt = NULL; 819 for (int i = 0; i < _packset.length(); i++) { 820 Node_List* p = _packset.at(i); 821 for (uint j = 0; j < p->size(); j++) { 822 Node* s = p->at(j); 823 assert(my_pack(s) == NULL, "only in one pack"); 824 set_my_pack(s, p); 825 } 826 } 827 } 828 829 //------------------------------filter_packs--------------------------- 830 // Remove packs that are not implemented or not profitable. 831 void SuperWord::filter_packs() { 832 833 // Remove packs that are not implemented 834 for (int i = _packset.length() - 1; i >= 0; i--) { 835 Node_List* pk = _packset.at(i); 836 bool impl = implemented(pk); 837 if (!impl) { 838 #ifndef PRODUCT 839 if (TraceSuperWord && Verbose) { 840 tty->print_cr("Unimplemented"); 841 pk->at(0)->dump(); 842 } 843 #endif 844 remove_pack_at(i); 845 } 846 } 847 848 // Remove packs that are not profitable 849 bool changed; 850 do { 851 changed = false; 852 for (int i = _packset.length() - 1; i >= 0; i--) { 853 Node_List* pk = _packset.at(i); 854 bool prof = profitable(pk); 855 if (!prof) { 856 #ifndef PRODUCT 857 if (TraceSuperWord && Verbose) { 858 tty->print_cr("Unprofitable"); 859 pk->at(0)->dump(); 860 } 861 #endif 862 remove_pack_at(i); 863 changed = true; 864 } 865 } 866 } while (changed); 867 868 #ifndef PRODUCT 869 if (TraceSuperWord) { 870 tty->print_cr("\nAfter filter_packs"); 871 print_packset(); 872 tty->cr(); 873 } 874 #endif 875 } 876 877 //------------------------------implemented--------------------------- 878 // Can code be generated for pack p? 879 bool SuperWord::implemented(Node_List* p) { 880 Node* p0 = p->at(0); 881 int vopc = VectorNode::opcode(p0->Opcode(), p->size(), velt_type(p0)); 882 return vopc > 0 && Matcher::has_match_rule(vopc); 883 } 884 885 //------------------------------profitable--------------------------- 886 // For pack p, are all operands and all uses (with in the block) vector? 887 bool SuperWord::profitable(Node_List* p) { 888 Node* p0 = p->at(0); 889 uint start, end; 890 vector_opd_range(p0, &start, &end); 891 892 // Return false if some input is not vector and inside block 893 for (uint i = start; i < end; i++) { 894 if (!is_vector_use(p0, i)) { 895 // For now, return false if not scalar promotion case (inputs are the same.) 896 // Later, implement PackNode and allow differing, non-vector inputs 897 // (maybe just the ones from outside the block.) 898 Node* p0_def = p0->in(i); 899 for (uint j = 1; j < p->size(); j++) { 900 Node* use = p->at(j); 901 Node* def = use->in(i); 902 if (p0_def != def) 903 return false; 904 } 905 } 906 } 907 if (!p0->is_Store()) { 908 // For now, return false if not all uses are vector. 909 // Later, implement ExtractNode and allow non-vector uses (maybe 910 // just the ones outside the block.) 911 for (uint i = 0; i < p->size(); i++) { 912 Node* def = p->at(i); 913 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { 914 Node* use = def->fast_out(j); 915 for (uint k = 0; k < use->req(); k++) { 916 Node* n = use->in(k); 917 if (def == n) { 918 if (!is_vector_use(use, k)) { 919 return false; 920 } 921 } 922 } 923 } 924 } 925 } 926 return true; 927 } 928 929 //------------------------------schedule--------------------------- 930 // Adjust the memory graph for the packed operations 931 void SuperWord::schedule() { 932 933 // Co-locate in the memory graph the members of each memory pack 934 for (int i = 0; i < _packset.length(); i++) { 935 co_locate_pack(_packset.at(i)); 936 } 937 } 938 939 //-------------------------------remove_and_insert------------------- 940 //remove "current" from its current position in the memory graph and insert 941 //it after the appropriate insertion point (lip or uip) 942 void SuperWord::remove_and_insert(MemNode *current, MemNode *prev, MemNode *lip, 943 Node *uip, Unique_Node_List &sched_before) { 944 Node* my_mem = current->in(MemNode::Memory); 945 _igvn.hash_delete(current); 946 _igvn.hash_delete(my_mem); 947 948 //remove current_store from its current position in the memmory graph 949 for (DUIterator i = current->outs(); current->has_out(i); i++) { 950 Node* use = current->out(i); 951 if (use->is_Mem()) { 952 assert(use->in(MemNode::Memory) == current, "must be"); 953 _igvn.hash_delete(use); 954 if (use == prev) { // connect prev to my_mem 955 use->set_req(MemNode::Memory, my_mem); 956 } else if (sched_before.member(use)) { 957 _igvn.hash_delete(uip); 958 use->set_req(MemNode::Memory, uip); 959 } else { 960 _igvn.hash_delete(lip); 961 use->set_req(MemNode::Memory, lip); 962 } 963 _igvn._worklist.push(use); 964 --i; //deleted this edge; rescan position 965 } 966 } 967 968 bool sched_up = sched_before.member(current); 969 Node *insert_pt = sched_up ? uip : lip; 970 _igvn.hash_delete(insert_pt); 971 972 // all uses of insert_pt's memory state should use current's instead 973 for (DUIterator i = insert_pt->outs(); insert_pt->has_out(i); i++) { 974 Node* use = insert_pt->out(i); 975 if (use->is_Mem()) { 976 assert(use->in(MemNode::Memory) == insert_pt, "must be"); 977 _igvn.hash_delete(use); 978 use->set_req(MemNode::Memory, current); 979 _igvn._worklist.push(use); 980 --i; //deleted this edge; rescan position 981 } else if (!sched_up && use->is_Phi() && use->bottom_type() == Type::MEMORY) { 982 uint pos; //lip (lower insert point) must be the last one in the memory slice 983 _igvn.hash_delete(use); 984 for (pos=1; pos < use->req(); pos++) { 985 if (use->in(pos) == insert_pt) break; 986 } 987 use->set_req(pos, current); 988 _igvn._worklist.push(use); 989 --i; 990 } 991 } 992 993 //connect current to insert_pt 994 current->set_req(MemNode::Memory, insert_pt); 995 _igvn._worklist.push(current); 996 } 997 998 //------------------------------co_locate_pack---------------------------------- 999 // To schedule a store pack, we need to move any sandwiched memory ops either before 1000 // or after the pack, based upon dependence information: 1001 // (1) If any store in the pack depends on the sandwiched memory op, the 1002 // sandwiched memory op must be scheduled BEFORE the pack; 1003 // (2) If a sandwiched memory op depends on any store in the pack, the 1004 // sandwiched memory op must be scheduled AFTER the pack; 1005 // (3) If a sandwiched memory op (say, memA) depends on another sandwiched 1006 // memory op (say memB), memB must be scheduled before memA. So, if memA is 1007 // scheduled before the pack, memB must also be scheduled before the pack; 1008 // (4) If there is no dependence restriction for a sandwiched memory op, we simply 1009 // schedule this store AFTER the pack 1010 // (5) We know there is no dependence cycle, so there in no other case; 1011 // (6) Finally, all memory ops in another single pack should be moved in the same direction. 1012 // 1013 // To schedule a load pack, we use the memory state of either the first or the last load in 1014 // the pack, based on the dependence constraint. 1015 void SuperWord::co_locate_pack(Node_List* pk) { 1016 if (pk->at(0)->is_Store()) { 1017 MemNode* first = executed_first(pk)->as_Mem(); 1018 MemNode* last = executed_last(pk)->as_Mem(); 1019 Unique_Node_List schedule_before_pack; 1020 Unique_Node_List memops; 1021 1022 MemNode* current = last->in(MemNode::Memory)->as_Mem(); 1023 MemNode* previous = last; 1024 while (true) { 1025 assert(in_bb(current), "stay in block"); 1026 memops.push(previous); 1027 for (DUIterator i = current->outs(); current->has_out(i); i++) { 1028 Node* use = current->out(i); 1029 if (use->is_Mem() && use != previous) 1030 memops.push(use); 1031 } 1032 if(current == first) break; 1033 previous = current; 1034 current = current->in(MemNode::Memory)->as_Mem(); 1035 } 1036 1037 // determine which memory operations should be scheduled before the pack 1038 for (uint i = 1; i < memops.size(); i++) { 1039 Node *s1 = memops.at(i); 1040 if (!in_pack(s1, pk) && !schedule_before_pack.member(s1)) { 1041 for (uint j = 0; j< i; j++) { 1042 Node *s2 = memops.at(j); 1043 if (!independent(s1, s2)) { 1044 if (in_pack(s2, pk) || schedule_before_pack.member(s2)) { 1045 schedule_before_pack.push(s1); //s1 must be scheduled before 1046 Node_List* mem_pk = my_pack(s1); 1047 if (mem_pk != NULL) { 1048 for (uint ii = 0; ii < mem_pk->size(); ii++) { 1049 Node* s = mem_pk->at(ii); // follow partner 1050 if (memops.member(s) && !schedule_before_pack.member(s)) 1051 schedule_before_pack.push(s); 1052 } 1053 } 1054 } 1055 } 1056 } 1057 } 1058 } 1059 1060 MemNode* lower_insert_pt = last; 1061 Node* upper_insert_pt = first->in(MemNode::Memory); 1062 previous = last; //previous store in pk 1063 current = last->in(MemNode::Memory)->as_Mem(); 1064 1065 //start scheduling from "last" to "first" 1066 while (true) { 1067 assert(in_bb(current), "stay in block"); 1068 assert(in_pack(previous, pk), "previous stays in pack"); 1069 Node* my_mem = current->in(MemNode::Memory); 1070 1071 if (in_pack(current, pk)) { 1072 // Forward users of my memory state (except "previous) to my input memory state 1073 _igvn.hash_delete(current); 1074 for (DUIterator i = current->outs(); current->has_out(i); i++) { 1075 Node* use = current->out(i); 1076 if (use->is_Mem() && use != previous) { 1077 assert(use->in(MemNode::Memory) == current, "must be"); 1078 _igvn.hash_delete(use); 1079 if (schedule_before_pack.member(use)) { 1080 _igvn.hash_delete(upper_insert_pt); 1081 use->set_req(MemNode::Memory, upper_insert_pt); 1082 } else { 1083 _igvn.hash_delete(lower_insert_pt); 1084 use->set_req(MemNode::Memory, lower_insert_pt); 1085 } 1086 _igvn._worklist.push(use); 1087 --i; // deleted this edge; rescan position 1088 } 1089 } 1090 previous = current; 1091 } else { // !in_pack(current, pk) ==> a sandwiched store 1092 remove_and_insert(current, previous, lower_insert_pt, upper_insert_pt, schedule_before_pack); 1093 } 1094 1095 if (current == first) break; 1096 current = my_mem->as_Mem(); 1097 } // end while 1098 } else if (pk->at(0)->is_Load()) { //load 1099 // all loads in the pack should have the same memory state. By default, 1100 // we use the memory state of the last load. However, if any load could 1101 // not be moved down due to the dependence constraint, we use the memory 1102 // state of the first load. 1103 Node* last_mem = executed_last(pk)->in(MemNode::Memory); 1104 Node* first_mem = executed_first(pk)->in(MemNode::Memory); 1105 bool schedule_last = true; 1106 for (uint i = 0; i < pk->size(); i++) { 1107 Node* ld = pk->at(i); 1108 for (Node* current = last_mem; current != ld->in(MemNode::Memory); 1109 current=current->in(MemNode::Memory)) { 1110 assert(current != first_mem, "corrupted memory graph"); 1111 if(current->is_Mem() && !independent(current, ld)){ 1112 schedule_last = false; // a later store depends on this load 1113 break; 1114 } 1115 } 1116 } 1117 1118 Node* mem_input = schedule_last ? last_mem : first_mem; 1119 _igvn.hash_delete(mem_input); 1120 // Give each load the same memory state 1121 for (uint i = 0; i < pk->size(); i++) { 1122 LoadNode* ld = pk->at(i)->as_Load(); 1123 _igvn.hash_delete(ld); 1124 ld->set_req(MemNode::Memory, mem_input); 1125 _igvn._worklist.push(ld); 1126 } 1127 } 1128 } 1129 1130 //------------------------------output--------------------------- 1131 // Convert packs into vector node operations 1132 void SuperWord::output() { 1133 if (_packset.length() == 0) return; 1134 1135 // MUST ENSURE main loop's initial value is properly aligned: 1136 // (iv_initial_value + min_iv_offset) % vector_width_in_bytes() == 0 1137 1138 align_initial_loop_index(align_to_ref()); 1139 1140 // Insert extract (unpack) operations for scalar uses 1141 for (int i = 0; i < _packset.length(); i++) { 1142 insert_extracts(_packset.at(i)); 1143 } 1144 1145 for (int i = 0; i < _block.length(); i++) { 1146 Node* n = _block.at(i); 1147 Node_List* p = my_pack(n); 1148 if (p && n == executed_last(p)) { 1149 uint vlen = p->size(); 1150 Node* vn = NULL; 1151 Node* low_adr = p->at(0); 1152 Node* first = executed_first(p); 1153 if (n->is_Load()) { 1154 int opc = n->Opcode(); 1155 Node* ctl = n->in(MemNode::Control); 1156 Node* mem = first->in(MemNode::Memory); 1157 Node* adr = low_adr->in(MemNode::Address); 1158 const TypePtr* atyp = n->adr_type(); 1159 vn = VectorLoadNode::make(_phase->C, opc, ctl, mem, adr, atyp, vlen); 1160 1161 } else if (n->is_Store()) { 1162 // Promote value to be stored to vector 1163 VectorNode* val = vector_opd(p, MemNode::ValueIn); 1164 1165 int opc = n->Opcode(); 1166 Node* ctl = n->in(MemNode::Control); 1167 Node* mem = first->in(MemNode::Memory); 1168 Node* adr = low_adr->in(MemNode::Address); 1169 const TypePtr* atyp = n->adr_type(); 1170 vn = VectorStoreNode::make(_phase->C, opc, ctl, mem, adr, atyp, val, vlen); 1171 1172 } else if (n->req() == 3) { 1173 // Promote operands to vector 1174 Node* in1 = vector_opd(p, 1); 1175 Node* in2 = vector_opd(p, 2); 1176 vn = VectorNode::make(_phase->C, n->Opcode(), in1, in2, vlen, velt_type(n)); 1177 1178 } else { 1179 ShouldNotReachHere(); 1180 } 1181 1182 _phase->_igvn.register_new_node_with_optimizer(vn); 1183 _phase->set_ctrl(vn, _phase->get_ctrl(p->at(0))); 1184 for (uint j = 0; j < p->size(); j++) { 1185 Node* pm = p->at(j); 1186 _igvn.replace_node(pm, vn); 1187 } 1188 _igvn._worklist.push(vn); 1189 } 1190 } 1191 } 1192 1193 //------------------------------vector_opd--------------------------- 1194 // Create a vector operand for the nodes in pack p for operand: in(opd_idx) 1195 VectorNode* SuperWord::vector_opd(Node_List* p, int opd_idx) { 1196 Node* p0 = p->at(0); 1197 uint vlen = p->size(); 1198 Node* opd = p0->in(opd_idx); 1199 1200 bool same_opd = true; 1201 for (uint i = 1; i < vlen; i++) { 1202 Node* pi = p->at(i); 1203 Node* in = pi->in(opd_idx); 1204 if (opd != in) { 1205 same_opd = false; 1206 break; 1207 } 1208 } 1209 1210 if (same_opd) { 1211 if (opd->is_Vector()) { 1212 return (VectorNode*)opd; // input is matching vector 1213 } 1214 // Convert scalar input to vector. Use p0's type because it's container 1215 // maybe smaller than the operand's container. 1216 const Type* opd_t = velt_type(!in_bb(opd) ? p0 : opd); 1217 const Type* p0_t = velt_type(p0); 1218 if (p0_t->higher_equal(opd_t)) opd_t = p0_t; 1219 VectorNode* vn = VectorNode::scalar2vector(_phase->C, opd, vlen, opd_t); 1220 1221 _phase->_igvn.register_new_node_with_optimizer(vn); 1222 _phase->set_ctrl(vn, _phase->get_ctrl(opd)); 1223 return vn; 1224 } 1225 1226 // Insert pack operation 1227 const Type* opd_t = velt_type(!in_bb(opd) ? p0 : opd); 1228 PackNode* pk = PackNode::make(_phase->C, opd, opd_t); 1229 1230 for (uint i = 1; i < vlen; i++) { 1231 Node* pi = p->at(i); 1232 Node* in = pi->in(opd_idx); 1233 assert(my_pack(in) == NULL, "Should already have been unpacked"); 1234 assert(opd_t == velt_type(!in_bb(in) ? pi : in), "all same type"); 1235 pk->add_opd(in); 1236 } 1237 _phase->_igvn.register_new_node_with_optimizer(pk); 1238 _phase->set_ctrl(pk, _phase->get_ctrl(opd)); 1239 return pk; 1240 } 1241 1242 //------------------------------insert_extracts--------------------------- 1243 // If a use of pack p is not a vector use, then replace the 1244 // use with an extract operation. 1245 void SuperWord::insert_extracts(Node_List* p) { 1246 if (p->at(0)->is_Store()) return; 1247 assert(_n_idx_list.is_empty(), "empty (node,index) list"); 1248 1249 // Inspect each use of each pack member. For each use that is 1250 // not a vector use, replace the use with an extract operation. 1251 1252 for (uint i = 0; i < p->size(); i++) { 1253 Node* def = p->at(i); 1254 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { 1255 Node* use = def->fast_out(j); 1256 for (uint k = 0; k < use->req(); k++) { 1257 Node* n = use->in(k); 1258 if (def == n) { 1259 if (!is_vector_use(use, k)) { 1260 _n_idx_list.push(use, k); 1261 } 1262 } 1263 } 1264 } 1265 } 1266 1267 while (_n_idx_list.is_nonempty()) { 1268 Node* use = _n_idx_list.node(); 1269 int idx = _n_idx_list.index(); 1270 _n_idx_list.pop(); 1271 Node* def = use->in(idx); 1272 1273 // Insert extract operation 1274 _igvn.hash_delete(def); 1275 _igvn.hash_delete(use); 1276 int def_pos = alignment(def) / data_size(def); 1277 const Type* def_t = velt_type(def); 1278 1279 Node* ex = ExtractNode::make(_phase->C, def, def_pos, def_t); 1280 _phase->_igvn.register_new_node_with_optimizer(ex); 1281 _phase->set_ctrl(ex, _phase->get_ctrl(def)); 1282 use->set_req(idx, ex); 1283 _igvn._worklist.push(def); 1284 _igvn._worklist.push(use); 1285 1286 bb_insert_after(ex, bb_idx(def)); 1287 set_velt_type(ex, def_t); 1288 } 1289 } 1290 1291 //------------------------------is_vector_use--------------------------- 1292 // Is use->in(u_idx) a vector use? 1293 bool SuperWord::is_vector_use(Node* use, int u_idx) { 1294 Node_List* u_pk = my_pack(use); 1295 if (u_pk == NULL) return false; 1296 Node* def = use->in(u_idx); 1297 Node_List* d_pk = my_pack(def); 1298 if (d_pk == NULL) { 1299 // check for scalar promotion 1300 Node* n = u_pk->at(0)->in(u_idx); 1301 for (uint i = 1; i < u_pk->size(); i++) { 1302 if (u_pk->at(i)->in(u_idx) != n) return false; 1303 } 1304 return true; 1305 } 1306 if (u_pk->size() != d_pk->size()) 1307 return false; 1308 for (uint i = 0; i < u_pk->size(); i++) { 1309 Node* ui = u_pk->at(i); 1310 Node* di = d_pk->at(i); 1311 if (ui->in(u_idx) != di || alignment(ui) != alignment(di)) 1312 return false; 1313 } 1314 return true; 1315 } 1316 1317 //------------------------------construct_bb--------------------------- 1318 // Construct reverse postorder list of block members 1319 void SuperWord::construct_bb() { 1320 Node* entry = bb(); 1321 1322 assert(_stk.length() == 0, "stk is empty"); 1323 assert(_block.length() == 0, "block is empty"); 1324 assert(_data_entry.length() == 0, "data_entry is empty"); 1325 assert(_mem_slice_head.length() == 0, "mem_slice_head is empty"); 1326 assert(_mem_slice_tail.length() == 0, "mem_slice_tail is empty"); 1327 1328 // Find non-control nodes with no inputs from within block, 1329 // create a temporary map from node _idx to bb_idx for use 1330 // by the visited and post_visited sets, 1331 // and count number of nodes in block. 1332 int bb_ct = 0; 1333 for (uint i = 0; i < lpt()->_body.size(); i++ ) { 1334 Node *n = lpt()->_body.at(i); 1335 set_bb_idx(n, i); // Create a temporary map 1336 if (in_bb(n)) { 1337 bb_ct++; 1338 if (!n->is_CFG()) { 1339 bool found = false; 1340 for (uint j = 0; j < n->req(); j++) { 1341 Node* def = n->in(j); 1342 if (def && in_bb(def)) { 1343 found = true; 1344 break; 1345 } 1346 } 1347 if (!found) { 1348 assert(n != entry, "can't be entry"); 1349 _data_entry.push(n); 1350 } 1351 } 1352 } 1353 } 1354 1355 // Find memory slices (head and tail) 1356 for (DUIterator_Fast imax, i = lp()->fast_outs(imax); i < imax; i++) { 1357 Node *n = lp()->fast_out(i); 1358 if (in_bb(n) && (n->is_Phi() && n->bottom_type() == Type::MEMORY)) { 1359 Node* n_tail = n->in(LoopNode::LoopBackControl); 1360 if (n_tail != n->in(LoopNode::EntryControl)) { 1361 _mem_slice_head.push(n); 1362 _mem_slice_tail.push(n_tail); 1363 } 1364 } 1365 } 1366 1367 // Create an RPO list of nodes in block 1368 1369 visited_clear(); 1370 post_visited_clear(); 1371 1372 // Push all non-control nodes with no inputs from within block, then control entry 1373 for (int j = 0; j < _data_entry.length(); j++) { 1374 Node* n = _data_entry.at(j); 1375 visited_set(n); 1376 _stk.push(n); 1377 } 1378 visited_set(entry); 1379 _stk.push(entry); 1380 1381 // Do a depth first walk over out edges 1382 int rpo_idx = bb_ct - 1; 1383 int size; 1384 while ((size = _stk.length()) > 0) { 1385 Node* n = _stk.top(); // Leave node on stack 1386 if (!visited_test_set(n)) { 1387 // forward arc in graph 1388 } else if (!post_visited_test(n)) { 1389 // cross or back arc 1390 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { 1391 Node *use = n->fast_out(i); 1392 if (in_bb(use) && !visited_test(use) && 1393 // Don't go around backedge 1394 (!use->is_Phi() || n == entry)) { 1395 _stk.push(use); 1396 } 1397 } 1398 if (_stk.length() == size) { 1399 // There were no additional uses, post visit node now 1400 _stk.pop(); // Remove node from stack 1401 assert(rpo_idx >= 0, ""); 1402 _block.at_put_grow(rpo_idx, n); 1403 rpo_idx--; 1404 post_visited_set(n); 1405 assert(rpo_idx >= 0 || _stk.is_empty(), ""); 1406 } 1407 } else { 1408 _stk.pop(); // Remove post-visited node from stack 1409 } 1410 } 1411 1412 // Create real map of block indices for nodes 1413 for (int j = 0; j < _block.length(); j++) { 1414 Node* n = _block.at(j); 1415 set_bb_idx(n, j); 1416 } 1417 1418 initialize_bb(); // Ensure extra info is allocated. 1419 1420 #ifndef PRODUCT 1421 if (TraceSuperWord) { 1422 print_bb(); 1423 tty->print_cr("\ndata entry nodes: %s", _data_entry.length() > 0 ? "" : "NONE"); 1424 for (int m = 0; m < _data_entry.length(); m++) { 1425 tty->print("%3d ", m); 1426 _data_entry.at(m)->dump(); 1427 } 1428 tty->print_cr("\nmemory slices: %s", _mem_slice_head.length() > 0 ? "" : "NONE"); 1429 for (int m = 0; m < _mem_slice_head.length(); m++) { 1430 tty->print("%3d ", m); _mem_slice_head.at(m)->dump(); 1431 tty->print(" "); _mem_slice_tail.at(m)->dump(); 1432 } 1433 } 1434 #endif 1435 assert(rpo_idx == -1 && bb_ct == _block.length(), "all block members found"); 1436 } 1437 1438 //------------------------------initialize_bb--------------------------- 1439 // Initialize per node info 1440 void SuperWord::initialize_bb() { 1441 Node* last = _block.at(_block.length() - 1); 1442 grow_node_info(bb_idx(last)); 1443 } 1444 1445 //------------------------------bb_insert_after--------------------------- 1446 // Insert n into block after pos 1447 void SuperWord::bb_insert_after(Node* n, int pos) { 1448 int n_pos = pos + 1; 1449 // Make room 1450 for (int i = _block.length() - 1; i >= n_pos; i--) { 1451 _block.at_put_grow(i+1, _block.at(i)); 1452 } 1453 for (int j = _node_info.length() - 1; j >= n_pos; j--) { 1454 _node_info.at_put_grow(j+1, _node_info.at(j)); 1455 } 1456 // Set value 1457 _block.at_put_grow(n_pos, n); 1458 _node_info.at_put_grow(n_pos, SWNodeInfo::initial); 1459 // Adjust map from node->_idx to _block index 1460 for (int i = n_pos; i < _block.length(); i++) { 1461 set_bb_idx(_block.at(i), i); 1462 } 1463 } 1464 1465 //------------------------------compute_max_depth--------------------------- 1466 // Compute max depth for expressions from beginning of block 1467 // Use to prune search paths during test for independence. 1468 void SuperWord::compute_max_depth() { 1469 int ct = 0; 1470 bool again; 1471 do { 1472 again = false; 1473 for (int i = 0; i < _block.length(); i++) { 1474 Node* n = _block.at(i); 1475 if (!n->is_Phi()) { 1476 int d_orig = depth(n); 1477 int d_in = 0; 1478 for (DepPreds preds(n, _dg); !preds.done(); preds.next()) { 1479 Node* pred = preds.current(); 1480 if (in_bb(pred)) { 1481 d_in = MAX2(d_in, depth(pred)); 1482 } 1483 } 1484 if (d_in + 1 != d_orig) { 1485 set_depth(n, d_in + 1); 1486 again = true; 1487 } 1488 } 1489 } 1490 ct++; 1491 } while (again); 1492 #ifndef PRODUCT 1493 if (TraceSuperWord && Verbose) 1494 tty->print_cr("compute_max_depth iterated: %d times", ct); 1495 #endif 1496 } 1497 1498 //-------------------------compute_vector_element_type----------------------- 1499 // Compute necessary vector element type for expressions 1500 // This propagates backwards a narrower integer type when the 1501 // upper bits of the value are not needed. 1502 // Example: char a,b,c; a = b + c; 1503 // Normally the type of the add is integer, but for packed character 1504 // operations the type of the add needs to be char. 1505 void SuperWord::compute_vector_element_type() { 1506 #ifndef PRODUCT 1507 if (TraceSuperWord && Verbose) 1508 tty->print_cr("\ncompute_velt_type:"); 1509 #endif 1510 1511 // Initial type 1512 for (int i = 0; i < _block.length(); i++) { 1513 Node* n = _block.at(i); 1514 const Type* t = n->is_Mem() ? Type::get_const_basic_type(n->as_Mem()->memory_type()) 1515 : _igvn.type(n); 1516 const Type* vt = container_type(t); 1517 set_velt_type(n, vt); 1518 } 1519 1520 // Propagate narrowed type backwards through operations 1521 // that don't depend on higher order bits 1522 for (int i = _block.length() - 1; i >= 0; i--) { 1523 Node* n = _block.at(i); 1524 // Only integer types need be examined 1525 if (n->bottom_type()->isa_int()) { 1526 uint start, end; 1527 vector_opd_range(n, &start, &end); 1528 const Type* vt = velt_type(n); 1529 1530 for (uint j = start; j < end; j++) { 1531 Node* in = n->in(j); 1532 // Don't propagate through a type conversion 1533 if (n->bottom_type() != in->bottom_type()) 1534 continue; 1535 switch(in->Opcode()) { 1536 case Op_AddI: case Op_AddL: 1537 case Op_SubI: case Op_SubL: 1538 case Op_MulI: case Op_MulL: 1539 case Op_AndI: case Op_AndL: 1540 case Op_OrI: case Op_OrL: 1541 case Op_XorI: case Op_XorL: 1542 case Op_LShiftI: case Op_LShiftL: 1543 case Op_CMoveI: case Op_CMoveL: 1544 if (in_bb(in)) { 1545 bool same_type = true; 1546 for (DUIterator_Fast kmax, k = in->fast_outs(kmax); k < kmax; k++) { 1547 Node *use = in->fast_out(k); 1548 if (!in_bb(use) || velt_type(use) != vt) { 1549 same_type = false; 1550 break; 1551 } 1552 } 1553 if (same_type) { 1554 set_velt_type(in, vt); 1555 } 1556 } 1557 } 1558 } 1559 } 1560 } 1561 #ifndef PRODUCT 1562 if (TraceSuperWord && Verbose) { 1563 for (int i = 0; i < _block.length(); i++) { 1564 Node* n = _block.at(i); 1565 velt_type(n)->dump(); 1566 tty->print("\t"); 1567 n->dump(); 1568 } 1569 } 1570 #endif 1571 } 1572 1573 //------------------------------memory_alignment--------------------------- 1574 // Alignment within a vector memory reference 1575 int SuperWord::memory_alignment(MemNode* s, int iv_adjust_in_bytes) { 1576 SWPointer p(s, this); 1577 if (!p.valid()) { 1578 return bottom_align; 1579 } 1580 int offset = p.offset_in_bytes(); 1581 offset += iv_adjust_in_bytes; 1582 int off_rem = offset % vector_width_in_bytes(); 1583 int off_mod = off_rem >= 0 ? off_rem : off_rem + vector_width_in_bytes(); 1584 return off_mod; 1585 } 1586 1587 //---------------------------container_type--------------------------- 1588 // Smallest type containing range of values 1589 const Type* SuperWord::container_type(const Type* t) { 1590 const Type* tp = t->make_ptr(); 1591 if (tp && tp->isa_aryptr()) { 1592 t = tp->is_aryptr()->elem(); 1593 } 1594 if (t->basic_type() == T_INT) { 1595 if (t->higher_equal(TypeInt::BOOL)) return TypeInt::BOOL; 1596 if (t->higher_equal(TypeInt::BYTE)) return TypeInt::BYTE; 1597 if (t->higher_equal(TypeInt::CHAR)) return TypeInt::CHAR; 1598 if (t->higher_equal(TypeInt::SHORT)) return TypeInt::SHORT; 1599 return TypeInt::INT; 1600 } 1601 return t; 1602 } 1603 1604 //-------------------------vector_opd_range----------------------- 1605 // (Start, end] half-open range defining which operands are vector 1606 void SuperWord::vector_opd_range(Node* n, uint* start, uint* end) { 1607 switch (n->Opcode()) { 1608 case Op_LoadB: case Op_LoadUS: 1609 case Op_LoadI: case Op_LoadL: 1610 case Op_LoadF: case Op_LoadD: 1611 case Op_LoadP: 1612 *start = 0; 1613 *end = 0; 1614 return; 1615 case Op_StoreB: case Op_StoreC: 1616 case Op_StoreI: case Op_StoreL: 1617 case Op_StoreF: case Op_StoreD: 1618 case Op_StoreP: 1619 *start = MemNode::ValueIn; 1620 *end = *start + 1; 1621 return; 1622 case Op_LShiftI: case Op_LShiftL: 1623 *start = 1; 1624 *end = 2; 1625 return; 1626 case Op_CMoveI: case Op_CMoveL: case Op_CMoveF: case Op_CMoveD: 1627 *start = 2; 1628 *end = n->req(); 1629 return; 1630 } 1631 *start = 1; 1632 *end = n->req(); // default is all operands 1633 } 1634 1635 //------------------------------in_packset--------------------------- 1636 // Are s1 and s2 in a pack pair and ordered as s1,s2? 1637 bool SuperWord::in_packset(Node* s1, Node* s2) { 1638 for (int i = 0; i < _packset.length(); i++) { 1639 Node_List* p = _packset.at(i); 1640 assert(p->size() == 2, "must be"); 1641 if (p->at(0) == s1 && p->at(p->size()-1) == s2) { 1642 return true; 1643 } 1644 } 1645 return false; 1646 } 1647 1648 //------------------------------in_pack--------------------------- 1649 // Is s in pack p? 1650 Node_List* SuperWord::in_pack(Node* s, Node_List* p) { 1651 for (uint i = 0; i < p->size(); i++) { 1652 if (p->at(i) == s) { 1653 return p; 1654 } 1655 } 1656 return NULL; 1657 } 1658 1659 //------------------------------remove_pack_at--------------------------- 1660 // Remove the pack at position pos in the packset 1661 void SuperWord::remove_pack_at(int pos) { 1662 Node_List* p = _packset.at(pos); 1663 for (uint i = 0; i < p->size(); i++) { 1664 Node* s = p->at(i); 1665 set_my_pack(s, NULL); 1666 } 1667 _packset.remove_at(pos); 1668 } 1669 1670 //------------------------------executed_first--------------------------- 1671 // Return the node executed first in pack p. Uses the RPO block list 1672 // to determine order. 1673 Node* SuperWord::executed_first(Node_List* p) { 1674 Node* n = p->at(0); 1675 int n_rpo = bb_idx(n); 1676 for (uint i = 1; i < p->size(); i++) { 1677 Node* s = p->at(i); 1678 int s_rpo = bb_idx(s); 1679 if (s_rpo < n_rpo) { 1680 n = s; 1681 n_rpo = s_rpo; 1682 } 1683 } 1684 return n; 1685 } 1686 1687 //------------------------------executed_last--------------------------- 1688 // Return the node executed last in pack p. 1689 Node* SuperWord::executed_last(Node_List* p) { 1690 Node* n = p->at(0); 1691 int n_rpo = bb_idx(n); 1692 for (uint i = 1; i < p->size(); i++) { 1693 Node* s = p->at(i); 1694 int s_rpo = bb_idx(s); 1695 if (s_rpo > n_rpo) { 1696 n = s; 1697 n_rpo = s_rpo; 1698 } 1699 } 1700 return n; 1701 } 1702 1703 //----------------------------align_initial_loop_index--------------------------- 1704 // Adjust pre-loop limit so that in main loop, a load/store reference 1705 // to align_to_ref will be a position zero in the vector. 1706 // (iv + k) mod vector_align == 0 1707 void SuperWord::align_initial_loop_index(MemNode* align_to_ref) { 1708 CountedLoopNode *main_head = lp()->as_CountedLoop(); 1709 assert(main_head->is_main_loop(), ""); 1710 CountedLoopEndNode* pre_end = get_pre_loop_end(main_head); 1711 assert(pre_end != NULL, ""); 1712 Node *pre_opaq1 = pre_end->limit(); 1713 assert(pre_opaq1->Opcode() == Op_Opaque1, ""); 1714 Opaque1Node *pre_opaq = (Opaque1Node*)pre_opaq1; 1715 Node *lim0 = pre_opaq->in(1); 1716 1717 // Where we put new limit calculations 1718 Node *pre_ctrl = pre_end->loopnode()->in(LoopNode::EntryControl); 1719 1720 // Ensure the original loop limit is available from the 1721 // pre-loop Opaque1 node. 1722 Node *orig_limit = pre_opaq->original_loop_limit(); 1723 assert(orig_limit != NULL && _igvn.type(orig_limit) != Type::TOP, ""); 1724 1725 SWPointer align_to_ref_p(align_to_ref, this); 1726 1727 // Given: 1728 // lim0 == original pre loop limit 1729 // V == v_align (power of 2) 1730 // invar == extra invariant piece of the address expression 1731 // e == k [ +/- invar ] 1732 // 1733 // When reassociating expressions involving '%' the basic rules are: 1734 // (a - b) % k == 0 => a % k == b % k 1735 // and: 1736 // (a + b) % k == 0 => a % k == (k - b) % k 1737 // 1738 // For stride > 0 && scale > 0, 1739 // Derive the new pre-loop limit "lim" such that the two constraints: 1740 // (1) lim = lim0 + N (where N is some positive integer < V) 1741 // (2) (e + lim) % V == 0 1742 // are true. 1743 // 1744 // Substituting (1) into (2), 1745 // (e + lim0 + N) % V == 0 1746 // solve for N: 1747 // N = (V - (e + lim0)) % V 1748 // substitute back into (1), so that new limit 1749 // lim = lim0 + (V - (e + lim0)) % V 1750 // 1751 // For stride > 0 && scale < 0 1752 // Constraints: 1753 // lim = lim0 + N 1754 // (e - lim) % V == 0 1755 // Solving for lim: 1756 // (e - lim0 - N) % V == 0 1757 // N = (e - lim0) % V 1758 // lim = lim0 + (e - lim0) % V 1759 // 1760 // For stride < 0 && scale > 0 1761 // Constraints: 1762 // lim = lim0 - N 1763 // (e + lim) % V == 0 1764 // Solving for lim: 1765 // (e + lim0 - N) % V == 0 1766 // N = (e + lim0) % V 1767 // lim = lim0 - (e + lim0) % V 1768 // 1769 // For stride < 0 && scale < 0 1770 // Constraints: 1771 // lim = lim0 - N 1772 // (e - lim) % V == 0 1773 // Solving for lim: 1774 // (e - lim0 + N) % V == 0 1775 // N = (V - (e - lim0)) % V 1776 // lim = lim0 - (V - (e - lim0)) % V 1777 1778 int stride = iv_stride(); 1779 int scale = align_to_ref_p.scale_in_bytes(); 1780 int elt_size = align_to_ref_p.memory_size(); 1781 int v_align = vector_width_in_bytes() / elt_size; 1782 int k = align_to_ref_p.offset_in_bytes() / elt_size; 1783 1784 Node *kn = _igvn.intcon(k); 1785 1786 Node *e = kn; 1787 if (align_to_ref_p.invar() != NULL) { 1788 // incorporate any extra invariant piece producing k +/- invar >>> log2(elt) 1789 Node* log2_elt = _igvn.intcon(exact_log2(elt_size)); 1790 Node* aref = new (_phase->C, 3) URShiftINode(align_to_ref_p.invar(), log2_elt); 1791 _phase->_igvn.register_new_node_with_optimizer(aref); 1792 _phase->set_ctrl(aref, pre_ctrl); 1793 if (align_to_ref_p.negate_invar()) { 1794 e = new (_phase->C, 3) SubINode(e, aref); 1795 } else { 1796 e = new (_phase->C, 3) AddINode(e, aref); 1797 } 1798 _phase->_igvn.register_new_node_with_optimizer(e); 1799 _phase->set_ctrl(e, pre_ctrl); 1800 } 1801 1802 // compute e +/- lim0 1803 if (scale < 0) { 1804 e = new (_phase->C, 3) SubINode(e, lim0); 1805 } else { 1806 e = new (_phase->C, 3) AddINode(e, lim0); 1807 } 1808 _phase->_igvn.register_new_node_with_optimizer(e); 1809 _phase->set_ctrl(e, pre_ctrl); 1810 1811 if (stride * scale > 0) { 1812 // compute V - (e +/- lim0) 1813 Node* va = _igvn.intcon(v_align); 1814 e = new (_phase->C, 3) SubINode(va, e); 1815 _phase->_igvn.register_new_node_with_optimizer(e); 1816 _phase->set_ctrl(e, pre_ctrl); 1817 } 1818 // compute N = (exp) % V 1819 Node* va_msk = _igvn.intcon(v_align - 1); 1820 Node* N = new (_phase->C, 3) AndINode(e, va_msk); 1821 _phase->_igvn.register_new_node_with_optimizer(N); 1822 _phase->set_ctrl(N, pre_ctrl); 1823 1824 // substitute back into (1), so that new limit 1825 // lim = lim0 + N 1826 Node* lim; 1827 if (stride < 0) { 1828 lim = new (_phase->C, 3) SubINode(lim0, N); 1829 } else { 1830 lim = new (_phase->C, 3) AddINode(lim0, N); 1831 } 1832 _phase->_igvn.register_new_node_with_optimizer(lim); 1833 _phase->set_ctrl(lim, pre_ctrl); 1834 Node* constrained = 1835 (stride > 0) ? (Node*) new (_phase->C,3) MinINode(lim, orig_limit) 1836 : (Node*) new (_phase->C,3) MaxINode(lim, orig_limit); 1837 _phase->_igvn.register_new_node_with_optimizer(constrained); 1838 _phase->set_ctrl(constrained, pre_ctrl); 1839 _igvn.hash_delete(pre_opaq); 1840 pre_opaq->set_req(1, constrained); 1841 } 1842 1843 //----------------------------get_pre_loop_end--------------------------- 1844 // Find pre loop end from main loop. Returns null if none. 1845 CountedLoopEndNode* SuperWord::get_pre_loop_end(CountedLoopNode *cl) { 1846 Node *ctrl = cl->in(LoopNode::EntryControl); 1847 if (!ctrl->is_IfTrue() && !ctrl->is_IfFalse()) return NULL; 1848 Node *iffm = ctrl->in(0); 1849 if (!iffm->is_If()) return NULL; 1850 Node *p_f = iffm->in(0); 1851 if (!p_f->is_IfFalse()) return NULL; 1852 if (!p_f->in(0)->is_CountedLoopEnd()) return NULL; 1853 CountedLoopEndNode *pre_end = p_f->in(0)->as_CountedLoopEnd(); 1854 if (!pre_end->loopnode()->is_pre_loop()) return NULL; 1855 return pre_end; 1856 } 1857 1858 1859 //------------------------------init--------------------------- 1860 void SuperWord::init() { 1861 _dg.init(); 1862 _packset.clear(); 1863 _disjoint_ptrs.clear(); 1864 _block.clear(); 1865 _data_entry.clear(); 1866 _mem_slice_head.clear(); 1867 _mem_slice_tail.clear(); 1868 _node_info.clear(); 1869 _align_to_ref = NULL; 1870 _lpt = NULL; 1871 _lp = NULL; 1872 _bb = NULL; 1873 _iv = NULL; 1874 } 1875 1876 //------------------------------print_packset--------------------------- 1877 void SuperWord::print_packset() { 1878 #ifndef PRODUCT 1879 tty->print_cr("packset"); 1880 for (int i = 0; i < _packset.length(); i++) { 1881 tty->print_cr("Pack: %d", i); 1882 Node_List* p = _packset.at(i); 1883 print_pack(p); 1884 } 1885 #endif 1886 } 1887 1888 //------------------------------print_pack--------------------------- 1889 void SuperWord::print_pack(Node_List* p) { 1890 for (uint i = 0; i < p->size(); i++) { 1891 print_stmt(p->at(i)); 1892 } 1893 } 1894 1895 //------------------------------print_bb--------------------------- 1896 void SuperWord::print_bb() { 1897 #ifndef PRODUCT 1898 tty->print_cr("\nBlock"); 1899 for (int i = 0; i < _block.length(); i++) { 1900 Node* n = _block.at(i); 1901 tty->print("%d ", i); 1902 if (n) { 1903 n->dump(); 1904 } 1905 } 1906 #endif 1907 } 1908 1909 //------------------------------print_stmt--------------------------- 1910 void SuperWord::print_stmt(Node* s) { 1911 #ifndef PRODUCT 1912 tty->print(" align: %d \t", alignment(s)); 1913 s->dump(); 1914 #endif 1915 } 1916 1917 //------------------------------blank--------------------------- 1918 char* SuperWord::blank(uint depth) { 1919 static char blanks[101]; 1920 assert(depth < 101, "too deep"); 1921 for (uint i = 0; i < depth; i++) blanks[i] = ' '; 1922 blanks[depth] = '\0'; 1923 return blanks; 1924 } 1925 1926 1927 //==============================SWPointer=========================== 1928 1929 //----------------------------SWPointer------------------------ 1930 SWPointer::SWPointer(MemNode* mem, SuperWord* slp) : 1931 _mem(mem), _slp(slp), _base(NULL), _adr(NULL), 1932 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) { 1933 1934 Node* adr = mem->in(MemNode::Address); 1935 if (!adr->is_AddP()) { 1936 assert(!valid(), "too complex"); 1937 return; 1938 } 1939 // Match AddP(base, AddP(ptr, k*iv [+ invariant]), constant) 1940 Node* base = adr->in(AddPNode::Base); 1941 //unsafe reference could not be aligned appropriately without runtime checking 1942 if (base == NULL || base->bottom_type() == Type::TOP) { 1943 assert(!valid(), "unsafe access"); 1944 return; 1945 } 1946 for (int i = 0; i < 3; i++) { 1947 if (!scaled_iv_plus_offset(adr->in(AddPNode::Offset))) { 1948 assert(!valid(), "too complex"); 1949 return; 1950 } 1951 adr = adr->in(AddPNode::Address); 1952 if (base == adr || !adr->is_AddP()) { 1953 break; // stop looking at addp's 1954 } 1955 } 1956 _base = base; 1957 _adr = adr; 1958 assert(valid(), "Usable"); 1959 } 1960 1961 // Following is used to create a temporary object during 1962 // the pattern match of an address expression. 1963 SWPointer::SWPointer(SWPointer* p) : 1964 _mem(p->_mem), _slp(p->_slp), _base(NULL), _adr(NULL), 1965 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) {} 1966 1967 //------------------------scaled_iv_plus_offset-------------------- 1968 // Match: k*iv + offset 1969 // where: k is a constant that maybe zero, and 1970 // offset is (k2 [+/- invariant]) where k2 maybe zero and invariant is optional 1971 bool SWPointer::scaled_iv_plus_offset(Node* n) { 1972 if (scaled_iv(n)) { 1973 return true; 1974 } 1975 if (offset_plus_k(n)) { 1976 return true; 1977 } 1978 int opc = n->Opcode(); 1979 if (opc == Op_AddI) { 1980 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2))) { 1981 return true; 1982 } 1983 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { 1984 return true; 1985 } 1986 } else if (opc == Op_SubI) { 1987 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2), true)) { 1988 return true; 1989 } 1990 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { 1991 _scale *= -1; 1992 return true; 1993 } 1994 } 1995 return false; 1996 } 1997 1998 //----------------------------scaled_iv------------------------ 1999 // Match: k*iv where k is a constant that's not zero 2000 bool SWPointer::scaled_iv(Node* n) { 2001 if (_scale != 0) { 2002 return false; // already found a scale 2003 } 2004 if (n == iv()) { 2005 _scale = 1; 2006 return true; 2007 } 2008 int opc = n->Opcode(); 2009 if (opc == Op_MulI) { 2010 if (n->in(1) == iv() && n->in(2)->is_Con()) { 2011 _scale = n->in(2)->get_int(); 2012 return true; 2013 } else if (n->in(2) == iv() && n->in(1)->is_Con()) { 2014 _scale = n->in(1)->get_int(); 2015 return true; 2016 } 2017 } else if (opc == Op_LShiftI) { 2018 if (n->in(1) == iv() && n->in(2)->is_Con()) { 2019 _scale = 1 << n->in(2)->get_int(); 2020 return true; 2021 } 2022 } else if (opc == Op_ConvI2L) { 2023 if (scaled_iv_plus_offset(n->in(1))) { 2024 return true; 2025 } 2026 } else if (opc == Op_LShiftL) { 2027 if (!has_iv() && _invar == NULL) { 2028 // Need to preserve the current _offset value, so 2029 // create a temporary object for this expression subtree. 2030 // Hacky, so should re-engineer the address pattern match. 2031 SWPointer tmp(this); 2032 if (tmp.scaled_iv_plus_offset(n->in(1))) { 2033 if (tmp._invar == NULL) { 2034 int mult = 1 << n->in(2)->get_int(); 2035 _scale = tmp._scale * mult; 2036 _offset += tmp._offset * mult; 2037 return true; 2038 } 2039 } 2040 } 2041 } 2042 return false; 2043 } 2044 2045 //----------------------------offset_plus_k------------------------ 2046 // Match: offset is (k [+/- invariant]) 2047 // where k maybe zero and invariant is optional, but not both. 2048 bool SWPointer::offset_plus_k(Node* n, bool negate) { 2049 int opc = n->Opcode(); 2050 if (opc == Op_ConI) { 2051 _offset += negate ? -(n->get_int()) : n->get_int(); 2052 return true; 2053 } else if (opc == Op_ConL) { 2054 // Okay if value fits into an int 2055 const TypeLong* t = n->find_long_type(); 2056 if (t->higher_equal(TypeLong::INT)) { 2057 jlong loff = n->get_long(); 2058 jint off = (jint)loff; 2059 _offset += negate ? -off : loff; 2060 return true; 2061 } 2062 return false; 2063 } 2064 if (_invar != NULL) return false; // already have an invariant 2065 if (opc == Op_AddI) { 2066 if (n->in(2)->is_Con() && invariant(n->in(1))) { 2067 _negate_invar = negate; 2068 _invar = n->in(1); 2069 _offset += negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); 2070 return true; 2071 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { 2072 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); 2073 _negate_invar = negate; 2074 _invar = n->in(2); 2075 return true; 2076 } 2077 } 2078 if (opc == Op_SubI) { 2079 if (n->in(2)->is_Con() && invariant(n->in(1))) { 2080 _negate_invar = negate; 2081 _invar = n->in(1); 2082 _offset += !negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); 2083 return true; 2084 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { 2085 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); 2086 _negate_invar = !negate; 2087 _invar = n->in(2); 2088 return true; 2089 } 2090 } 2091 if (invariant(n)) { 2092 _negate_invar = negate; 2093 _invar = n; 2094 return true; 2095 } 2096 return false; 2097 } 2098 2099 //----------------------------print------------------------ 2100 void SWPointer::print() { 2101 #ifndef PRODUCT 2102 tty->print("base: %d adr: %d scale: %d offset: %d invar: %c%d\n", 2103 _base != NULL ? _base->_idx : 0, 2104 _adr != NULL ? _adr->_idx : 0, 2105 _scale, _offset, 2106 _negate_invar?'-':'+', 2107 _invar != NULL ? _invar->_idx : 0); 2108 #endif 2109 } 2110 2111 // ========================= OrderedPair ===================== 2112 2113 const OrderedPair OrderedPair::initial; 2114 2115 // ========================= SWNodeInfo ===================== 2116 2117 const SWNodeInfo SWNodeInfo::initial; 2118 2119 2120 // ============================ DepGraph =========================== 2121 2122 //------------------------------make_node--------------------------- 2123 // Make a new dependence graph node for an ideal node. 2124 DepMem* DepGraph::make_node(Node* node) { 2125 DepMem* m = new (_arena) DepMem(node); 2126 if (node != NULL) { 2127 assert(_map.at_grow(node->_idx) == NULL, "one init only"); 2128 _map.at_put_grow(node->_idx, m); 2129 } 2130 return m; 2131 } 2132 2133 //------------------------------make_edge--------------------------- 2134 // Make a new dependence graph edge from dpred -> dsucc 2135 DepEdge* DepGraph::make_edge(DepMem* dpred, DepMem* dsucc) { 2136 DepEdge* e = new (_arena) DepEdge(dpred, dsucc, dsucc->in_head(), dpred->out_head()); 2137 dpred->set_out_head(e); 2138 dsucc->set_in_head(e); 2139 return e; 2140 } 2141 2142 // ========================== DepMem ======================== 2143 2144 //------------------------------in_cnt--------------------------- 2145 int DepMem::in_cnt() { 2146 int ct = 0; 2147 for (DepEdge* e = _in_head; e != NULL; e = e->next_in()) ct++; 2148 return ct; 2149 } 2150 2151 //------------------------------out_cnt--------------------------- 2152 int DepMem::out_cnt() { 2153 int ct = 0; 2154 for (DepEdge* e = _out_head; e != NULL; e = e->next_out()) ct++; 2155 return ct; 2156 } 2157 2158 //------------------------------print----------------------------- 2159 void DepMem::print() { 2160 #ifndef PRODUCT 2161 tty->print(" DepNode %d (", _node->_idx); 2162 for (DepEdge* p = _in_head; p != NULL; p = p->next_in()) { 2163 Node* pred = p->pred()->node(); 2164 tty->print(" %d", pred != NULL ? pred->_idx : 0); 2165 } 2166 tty->print(") ["); 2167 for (DepEdge* s = _out_head; s != NULL; s = s->next_out()) { 2168 Node* succ = s->succ()->node(); 2169 tty->print(" %d", succ != NULL ? succ->_idx : 0); 2170 } 2171 tty->print_cr(" ]"); 2172 #endif 2173 } 2174 2175 // =========================== DepEdge ========================= 2176 2177 //------------------------------DepPreds--------------------------- 2178 void DepEdge::print() { 2179 #ifndef PRODUCT 2180 tty->print_cr("DepEdge: %d [ %d ]", _pred->node()->_idx, _succ->node()->_idx); 2181 #endif 2182 } 2183 2184 // =========================== DepPreds ========================= 2185 // Iterator over predecessor edges in the dependence graph. 2186 2187 //------------------------------DepPreds--------------------------- 2188 DepPreds::DepPreds(Node* n, DepGraph& dg) { 2189 _n = n; 2190 _done = false; 2191 if (_n->is_Store() || _n->is_Load()) { 2192 _next_idx = MemNode::Address; 2193 _end_idx = n->req(); 2194 _dep_next = dg.dep(_n)->in_head(); 2195 } else if (_n->is_Mem()) { 2196 _next_idx = 0; 2197 _end_idx = 0; 2198 _dep_next = dg.dep(_n)->in_head(); 2199 } else { 2200 _next_idx = 1; 2201 _end_idx = _n->req(); 2202 _dep_next = NULL; 2203 } 2204 next(); 2205 } 2206 2207 //------------------------------next--------------------------- 2208 void DepPreds::next() { 2209 if (_dep_next != NULL) { 2210 _current = _dep_next->pred()->node(); 2211 _dep_next = _dep_next->next_in(); 2212 } else if (_next_idx < _end_idx) { 2213 _current = _n->in(_next_idx++); 2214 } else { 2215 _done = true; 2216 } 2217 } 2218 2219 // =========================== DepSuccs ========================= 2220 // Iterator over successor edges in the dependence graph. 2221 2222 //------------------------------DepSuccs--------------------------- 2223 DepSuccs::DepSuccs(Node* n, DepGraph& dg) { 2224 _n = n; 2225 _done = false; 2226 if (_n->is_Load()) { 2227 _next_idx = 0; 2228 _end_idx = _n->outcnt(); 2229 _dep_next = dg.dep(_n)->out_head(); 2230 } else if (_n->is_Mem() || _n->is_Phi() && _n->bottom_type() == Type::MEMORY) { 2231 _next_idx = 0; 2232 _end_idx = 0; 2233 _dep_next = dg.dep(_n)->out_head(); 2234 } else { 2235 _next_idx = 0; 2236 _end_idx = _n->outcnt(); 2237 _dep_next = NULL; 2238 } 2239 next(); 2240 } 2241 2242 //-------------------------------next--------------------------- 2243 void DepSuccs::next() { 2244 if (_dep_next != NULL) { 2245 _current = _dep_next->succ()->node(); 2246 _dep_next = _dep_next->next_out(); 2247 } else if (_next_idx < _end_idx) { 2248 _current = _n->raw_out(_next_idx++); 2249 } else { 2250 _done = true; 2251 } 2252 }