chaitin.cpp revision 3142:9b8ce46870df
1/* 2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "compiler/compileLog.hpp" 27#include "compiler/oopMap.hpp" 28#include "memory/allocation.inline.hpp" 29#include "opto/addnode.hpp" 30#include "opto/block.hpp" 31#include "opto/callnode.hpp" 32#include "opto/cfgnode.hpp" 33#include "opto/chaitin.hpp" 34#include "opto/coalesce.hpp" 35#include "opto/connode.hpp" 36#include "opto/idealGraphPrinter.hpp" 37#include "opto/indexSet.hpp" 38#include "opto/machnode.hpp" 39#include "opto/memnode.hpp" 40#include "opto/opcodes.hpp" 41#include "opto/rootnode.hpp" 42 43//============================================================================= 44 45#ifndef PRODUCT 46void LRG::dump( ) const { 47 ttyLocker ttyl; 48 tty->print("%d ",num_regs()); 49 _mask.dump(); 50 if( _msize_valid ) { 51 if( mask_size() == compute_mask_size() ) tty->print(", #%d ",_mask_size); 52 else tty->print(", #!!!_%d_vs_%d ",_mask_size,_mask.Size()); 53 } else { 54 tty->print(", #?(%d) ",_mask.Size()); 55 } 56 57 tty->print("EffDeg: "); 58 if( _degree_valid ) tty->print( "%d ", _eff_degree ); 59 else tty->print("? "); 60 61 if( is_multidef() ) { 62 tty->print("MultiDef "); 63 if (_defs != NULL) { 64 tty->print("("); 65 for (int i = 0; i < _defs->length(); i++) { 66 tty->print("N%d ", _defs->at(i)->_idx); 67 } 68 tty->print(") "); 69 } 70 } 71 else if( _def == 0 ) tty->print("Dead "); 72 else tty->print("Def: N%d ",_def->_idx); 73 74 tty->print("Cost:%4.2g Area:%4.2g Score:%4.2g ",_cost,_area, score()); 75 // Flags 76 if( _is_oop ) tty->print("Oop "); 77 if( _is_float ) tty->print("Float "); 78 if( _was_spilled1 ) tty->print("Spilled "); 79 if( _was_spilled2 ) tty->print("Spilled2 "); 80 if( _direct_conflict ) tty->print("Direct_conflict "); 81 if( _fat_proj ) tty->print("Fat "); 82 if( _was_lo ) tty->print("Lo "); 83 if( _has_copy ) tty->print("Copy "); 84 if( _at_risk ) tty->print("Risk "); 85 86 if( _must_spill ) tty->print("Must_spill "); 87 if( _is_bound ) tty->print("Bound "); 88 if( _msize_valid ) { 89 if( _degree_valid && lo_degree() ) tty->print("Trivial "); 90 } 91 92 tty->cr(); 93} 94#endif 95 96//------------------------------score------------------------------------------ 97// Compute score from cost and area. Low score is best to spill. 98static double raw_score( double cost, double area ) { 99 return cost - (area*RegisterCostAreaRatio) * 1.52588e-5; 100} 101 102double LRG::score() const { 103 // Scale _area by RegisterCostAreaRatio/64K then subtract from cost. 104 // Bigger area lowers score, encourages spilling this live range. 105 // Bigger cost raise score, prevents spilling this live range. 106 // (Note: 1/65536 is the magic constant below; I dont trust the C optimizer 107 // to turn a divide by a constant into a multiply by the reciprical). 108 double score = raw_score( _cost, _area); 109 110 // Account for area. Basically, LRGs covering large areas are better 111 // to spill because more other LRGs get freed up. 112 if( _area == 0.0 ) // No area? Then no progress to spill 113 return 1e35; 114 115 if( _was_spilled2 ) // If spilled once before, we are unlikely 116 return score + 1e30; // to make progress again. 117 118 if( _cost >= _area*3.0 ) // Tiny area relative to cost 119 return score + 1e17; // Probably no progress to spill 120 121 if( (_cost+_cost) >= _area*3.0 ) // Small area relative to cost 122 return score + 1e10; // Likely no progress to spill 123 124 return score; 125} 126 127//------------------------------LRG_List--------------------------------------- 128LRG_List::LRG_List( uint max ) : _cnt(max), _max(max), _lidxs(NEW_RESOURCE_ARRAY(uint,max)) { 129 memset( _lidxs, 0, sizeof(uint)*max ); 130} 131 132void LRG_List::extend( uint nidx, uint lidx ) { 133 _nesting.check(); 134 if( nidx >= _max ) { 135 uint size = 16; 136 while( size <= nidx ) size <<=1; 137 _lidxs = REALLOC_RESOURCE_ARRAY( uint, _lidxs, _max, size ); 138 _max = size; 139 } 140 while( _cnt <= nidx ) 141 _lidxs[_cnt++] = 0; 142 _lidxs[nidx] = lidx; 143} 144 145#define NUMBUCKS 3 146 147//------------------------------Chaitin---------------------------------------- 148PhaseChaitin::PhaseChaitin(uint unique, PhaseCFG &cfg, Matcher &matcher) 149 : PhaseRegAlloc(unique, cfg, matcher, 150#ifndef PRODUCT 151 print_chaitin_statistics 152#else 153 NULL 154#endif 155 ), 156 _names(unique), _uf_map(unique), 157 _maxlrg(0), _live(0), 158 _spilled_once(Thread::current()->resource_area()), 159 _spilled_twice(Thread::current()->resource_area()), 160 _lo_degree(0), _lo_stk_degree(0), _hi_degree(0), _simplified(0), 161 _oldphi(unique) 162#ifndef PRODUCT 163 , _trace_spilling(TraceSpilling || C->method_has_option("TraceSpilling")) 164#endif 165{ 166 NOT_PRODUCT( Compile::TracePhase t3("ctorChaitin", &_t_ctorChaitin, TimeCompiler); ) 167 168 _high_frequency_lrg = MIN2(float(OPTO_LRG_HIGH_FREQ), _cfg._outer_loop_freq); 169 170 uint i,j; 171 // Build a list of basic blocks, sorted by frequency 172 _blks = NEW_RESOURCE_ARRAY( Block *, _cfg._num_blocks ); 173 // Experiment with sorting strategies to speed compilation 174 double cutoff = BLOCK_FREQUENCY(1.0); // Cutoff for high frequency bucket 175 Block **buckets[NUMBUCKS]; // Array of buckets 176 uint buckcnt[NUMBUCKS]; // Array of bucket counters 177 double buckval[NUMBUCKS]; // Array of bucket value cutoffs 178 for( i = 0; i < NUMBUCKS; i++ ) { 179 buckets[i] = NEW_RESOURCE_ARRAY( Block *, _cfg._num_blocks ); 180 buckcnt[i] = 0; 181 // Bump by three orders of magnitude each time 182 cutoff *= 0.001; 183 buckval[i] = cutoff; 184 for( j = 0; j < _cfg._num_blocks; j++ ) { 185 buckets[i][j] = NULL; 186 } 187 } 188 // Sort blocks into buckets 189 for( i = 0; i < _cfg._num_blocks; i++ ) { 190 for( j = 0; j < NUMBUCKS; j++ ) { 191 if( (j == NUMBUCKS-1) || (_cfg._blocks[i]->_freq > buckval[j]) ) { 192 // Assign block to end of list for appropriate bucket 193 buckets[j][buckcnt[j]++] = _cfg._blocks[i]; 194 break; // kick out of inner loop 195 } 196 } 197 } 198 // Dump buckets into final block array 199 uint blkcnt = 0; 200 for( i = 0; i < NUMBUCKS; i++ ) { 201 for( j = 0; j < buckcnt[i]; j++ ) { 202 _blks[blkcnt++] = buckets[i][j]; 203 } 204 } 205 206 assert(blkcnt == _cfg._num_blocks, "Block array not totally filled"); 207} 208 209void PhaseChaitin::Register_Allocate() { 210 211 // Above the OLD FP (and in registers) are the incoming arguments. Stack 212 // slots in this area are called "arg_slots". Above the NEW FP (and in 213 // registers) is the outgoing argument area; above that is the spill/temp 214 // area. These are all "frame_slots". Arg_slots start at the zero 215 // stack_slots and count up to the known arg_size. Frame_slots start at 216 // the stack_slot #arg_size and go up. After allocation I map stack 217 // slots to actual offsets. Stack-slots in the arg_slot area are biased 218 // by the frame_size; stack-slots in the frame_slot area are biased by 0. 219 220 _trip_cnt = 0; 221 _alternate = 0; 222 _matcher._allocation_started = true; 223 224 ResourceArea live_arena; // Arena for liveness & IFG info 225 ResourceMark rm(&live_arena); 226 227 // Need live-ness for the IFG; need the IFG for coalescing. If the 228 // liveness is JUST for coalescing, then I can get some mileage by renaming 229 // all copy-related live ranges low and then using the max copy-related 230 // live range as a cut-off for LIVE and the IFG. In other words, I can 231 // build a subset of LIVE and IFG just for copies. 232 PhaseLive live(_cfg,_names,&live_arena); 233 234 // Need IFG for coalescing and coloring 235 PhaseIFG ifg( &live_arena ); 236 _ifg = &ifg; 237 238 if (C->unique() > _names.Size()) _names.extend(C->unique()-1, 0); 239 240 // Come out of SSA world to the Named world. Assign (virtual) registers to 241 // Nodes. Use the same register for all inputs and the output of PhiNodes 242 // - effectively ending SSA form. This requires either coalescing live 243 // ranges or inserting copies. For the moment, we insert "virtual copies" 244 // - we pretend there is a copy prior to each Phi in predecessor blocks. 245 // We will attempt to coalesce such "virtual copies" before we manifest 246 // them for real. 247 de_ssa(); 248 249#ifdef ASSERT 250 // Veify the graph before RA. 251 verify(&live_arena); 252#endif 253 254 { 255 NOT_PRODUCT( Compile::TracePhase t3("computeLive", &_t_computeLive, TimeCompiler); ) 256 _live = NULL; // Mark live as being not available 257 rm.reset_to_mark(); // Reclaim working storage 258 IndexSet::reset_memory(C, &live_arena); 259 ifg.init(_maxlrg); // Empty IFG 260 gather_lrg_masks( false ); // Collect LRG masks 261 live.compute( _maxlrg ); // Compute liveness 262 _live = &live; // Mark LIVE as being available 263 } 264 265 // Base pointers are currently "used" by instructions which define new 266 // derived pointers. This makes base pointers live up to the where the 267 // derived pointer is made, but not beyond. Really, they need to be live 268 // across any GC point where the derived value is live. So this code looks 269 // at all the GC points, and "stretches" the live range of any base pointer 270 // to the GC point. 271 if( stretch_base_pointer_live_ranges(&live_arena) ) { 272 NOT_PRODUCT( Compile::TracePhase t3("computeLive (sbplr)", &_t_computeLive, TimeCompiler); ) 273 // Since some live range stretched, I need to recompute live 274 _live = NULL; 275 rm.reset_to_mark(); // Reclaim working storage 276 IndexSet::reset_memory(C, &live_arena); 277 ifg.init(_maxlrg); 278 gather_lrg_masks( false ); 279 live.compute( _maxlrg ); 280 _live = &live; 281 } 282 // Create the interference graph using virtual copies 283 build_ifg_virtual( ); // Include stack slots this time 284 285 // Aggressive (but pessimistic) copy coalescing. 286 // This pass works on virtual copies. Any virtual copies which are not 287 // coalesced get manifested as actual copies 288 { 289 // The IFG is/was triangular. I am 'squaring it up' so Union can run 290 // faster. Union requires a 'for all' operation which is slow on the 291 // triangular adjacency matrix (quick reminder: the IFG is 'sparse' - 292 // meaning I can visit all the Nodes neighbors less than a Node in time 293 // O(# of neighbors), but I have to visit all the Nodes greater than a 294 // given Node and search them for an instance, i.e., time O(#MaxLRG)). 295 _ifg->SquareUp(); 296 297 PhaseAggressiveCoalesce coalesce( *this ); 298 coalesce.coalesce_driver( ); 299 // Insert un-coalesced copies. Visit all Phis. Where inputs to a Phi do 300 // not match the Phi itself, insert a copy. 301 coalesce.insert_copies(_matcher); 302 } 303 304 // After aggressive coalesce, attempt a first cut at coloring. 305 // To color, we need the IFG and for that we need LIVE. 306 { 307 NOT_PRODUCT( Compile::TracePhase t3("computeLive", &_t_computeLive, TimeCompiler); ) 308 _live = NULL; 309 rm.reset_to_mark(); // Reclaim working storage 310 IndexSet::reset_memory(C, &live_arena); 311 ifg.init(_maxlrg); 312 gather_lrg_masks( true ); 313 live.compute( _maxlrg ); 314 _live = &live; 315 } 316 317 // Build physical interference graph 318 uint must_spill = 0; 319 must_spill = build_ifg_physical( &live_arena ); 320 // If we have a guaranteed spill, might as well spill now 321 if( must_spill ) { 322 if( !_maxlrg ) return; 323 // Bail out if unique gets too large (ie - unique > MaxNodeLimit) 324 C->check_node_count(10*must_spill, "out of nodes before split"); 325 if (C->failing()) return; 326 _maxlrg = Split( _maxlrg ); // Split spilling LRG everywhere 327 // Bail out if unique gets too large (ie - unique > MaxNodeLimit - 2*NodeLimitFudgeFactor) 328 // or we failed to split 329 C->check_node_count(2*NodeLimitFudgeFactor, "out of nodes after physical split"); 330 if (C->failing()) return; 331 332 NOT_PRODUCT( C->verify_graph_edges(); ) 333 334 compact(); // Compact LRGs; return new lower max lrg 335 336 { 337 NOT_PRODUCT( Compile::TracePhase t3("computeLive", &_t_computeLive, TimeCompiler); ) 338 _live = NULL; 339 rm.reset_to_mark(); // Reclaim working storage 340 IndexSet::reset_memory(C, &live_arena); 341 ifg.init(_maxlrg); // Build a new interference graph 342 gather_lrg_masks( true ); // Collect intersect mask 343 live.compute( _maxlrg ); // Compute LIVE 344 _live = &live; 345 } 346 build_ifg_physical( &live_arena ); 347 _ifg->SquareUp(); 348 _ifg->Compute_Effective_Degree(); 349 // Only do conservative coalescing if requested 350 if( OptoCoalesce ) { 351 // Conservative (and pessimistic) copy coalescing of those spills 352 PhaseConservativeCoalesce coalesce( *this ); 353 // If max live ranges greater than cutoff, don't color the stack. 354 // This cutoff can be larger than below since it is only done once. 355 coalesce.coalesce_driver( ); 356 } 357 compress_uf_map_for_nodes(); 358 359#ifdef ASSERT 360 verify(&live_arena, true); 361#endif 362 } else { 363 ifg.SquareUp(); 364 ifg.Compute_Effective_Degree(); 365#ifdef ASSERT 366 set_was_low(); 367#endif 368 } 369 370 // Prepare for Simplify & Select 371 cache_lrg_info(); // Count degree of LRGs 372 373 // Simplify the InterFerence Graph by removing LRGs of low degree. 374 // LRGs of low degree are trivially colorable. 375 Simplify(); 376 377 // Select colors by re-inserting LRGs back into the IFG in reverse order. 378 // Return whether or not something spills. 379 uint spills = Select( ); 380 381 // If we spill, split and recycle the entire thing 382 while( spills ) { 383 if( _trip_cnt++ > 24 ) { 384 DEBUG_ONLY( dump_for_spill_split_recycle(); ) 385 if( _trip_cnt > 27 ) { 386 C->record_method_not_compilable("failed spill-split-recycle sanity check"); 387 return; 388 } 389 } 390 391 if( !_maxlrg ) return; 392 _maxlrg = Split( _maxlrg ); // Split spilling LRG everywhere 393 // Bail out if unique gets too large (ie - unique > MaxNodeLimit - 2*NodeLimitFudgeFactor) 394 C->check_node_count(2*NodeLimitFudgeFactor, "out of nodes after split"); 395 if (C->failing()) return; 396 397 compact(); // Compact LRGs; return new lower max lrg 398 399 // Nuke the live-ness and interference graph and LiveRanGe info 400 { 401 NOT_PRODUCT( Compile::TracePhase t3("computeLive", &_t_computeLive, TimeCompiler); ) 402 _live = NULL; 403 rm.reset_to_mark(); // Reclaim working storage 404 IndexSet::reset_memory(C, &live_arena); 405 ifg.init(_maxlrg); 406 407 // Create LiveRanGe array. 408 // Intersect register masks for all USEs and DEFs 409 gather_lrg_masks( true ); 410 live.compute( _maxlrg ); 411 _live = &live; 412 } 413 must_spill = build_ifg_physical( &live_arena ); 414 _ifg->SquareUp(); 415 _ifg->Compute_Effective_Degree(); 416 417 // Only do conservative coalescing if requested 418 if( OptoCoalesce ) { 419 // Conservative (and pessimistic) copy coalescing 420 PhaseConservativeCoalesce coalesce( *this ); 421 // Check for few live ranges determines how aggressive coalesce is. 422 coalesce.coalesce_driver( ); 423 } 424 compress_uf_map_for_nodes(); 425#ifdef ASSERT 426 verify(&live_arena, true); 427#endif 428 cache_lrg_info(); // Count degree of LRGs 429 430 // Simplify the InterFerence Graph by removing LRGs of low degree. 431 // LRGs of low degree are trivially colorable. 432 Simplify(); 433 434 // Select colors by re-inserting LRGs back into the IFG in reverse order. 435 // Return whether or not something spills. 436 spills = Select( ); 437 } 438 439 // Count number of Simplify-Select trips per coloring success. 440 _allocator_attempts += _trip_cnt + 1; 441 _allocator_successes += 1; 442 443 // Peephole remove copies 444 post_allocate_copy_removal(); 445 446#ifdef ASSERT 447 // Veify the graph after RA. 448 verify(&live_arena); 449#endif 450 451 // max_reg is past the largest *register* used. 452 // Convert that to a frame_slot number. 453 if( _max_reg <= _matcher._new_SP ) 454 _framesize = C->out_preserve_stack_slots(); 455 else _framesize = _max_reg -_matcher._new_SP; 456 assert((int)(_matcher._new_SP+_framesize) >= (int)_matcher._out_arg_limit, "framesize must be large enough"); 457 458 // This frame must preserve the required fp alignment 459 _framesize = round_to(_framesize, Matcher::stack_alignment_in_slots()); 460 assert( _framesize >= 0 && _framesize <= 1000000, "sanity check" ); 461#ifndef PRODUCT 462 _total_framesize += _framesize; 463 if( (int)_framesize > _max_framesize ) 464 _max_framesize = _framesize; 465#endif 466 467 // Convert CISC spills 468 fixup_spills(); 469 470 // Log regalloc results 471 CompileLog* log = Compile::current()->log(); 472 if (log != NULL) { 473 log->elem("regalloc attempts='%d' success='%d'", _trip_cnt, !C->failing()); 474 } 475 476 if (C->failing()) return; 477 478 NOT_PRODUCT( C->verify_graph_edges(); ) 479 480 // Move important info out of the live_arena to longer lasting storage. 481 alloc_node_regs(_names.Size()); 482 for( uint i=0; i < _names.Size(); i++ ) { 483 if( _names[i] ) { // Live range associated with Node? 484 LRG &lrg = lrgs( _names[i] ); 485 if( lrg.num_regs() == 1 ) { 486 _node_regs[i].set1( lrg.reg() ); 487 } else { // Must be a register-pair 488 if( !lrg._fat_proj ) { // Must be aligned adjacent register pair 489 // Live ranges record the highest register in their mask. 490 // We want the low register for the AD file writer's convenience. 491 _node_regs[i].set2( OptoReg::add(lrg.reg(),-1) ); 492 } else { // Misaligned; extract 2 bits 493 OptoReg::Name hi = lrg.reg(); // Get hi register 494 lrg.Remove(hi); // Yank from mask 495 int lo = lrg.mask().find_first_elem(); // Find lo 496 _node_regs[i].set_pair( hi, lo ); 497 } 498 } 499 if( lrg._is_oop ) _node_oops.set(i); 500 } else { 501 _node_regs[i].set_bad(); 502 } 503 } 504 505 // Done! 506 _live = NULL; 507 _ifg = NULL; 508 C->set_indexSet_arena(NULL); // ResourceArea is at end of scope 509} 510 511//------------------------------de_ssa----------------------------------------- 512void PhaseChaitin::de_ssa() { 513 // Set initial Names for all Nodes. Most Nodes get the virtual register 514 // number. A few get the ZERO live range number. These do not 515 // get allocated, but instead rely on correct scheduling to ensure that 516 // only one instance is simultaneously live at a time. 517 uint lr_counter = 1; 518 for( uint i = 0; i < _cfg._num_blocks; i++ ) { 519 Block *b = _cfg._blocks[i]; 520 uint cnt = b->_nodes.size(); 521 522 // Handle all the normal Nodes in the block 523 for( uint j = 0; j < cnt; j++ ) { 524 Node *n = b->_nodes[j]; 525 // Pre-color to the zero live range, or pick virtual register 526 const RegMask &rm = n->out_RegMask(); 527 _names.map( n->_idx, rm.is_NotEmpty() ? lr_counter++ : 0 ); 528 } 529 } 530 // Reset the Union-Find mapping to be identity 531 reset_uf_map(lr_counter); 532} 533 534 535//------------------------------gather_lrg_masks------------------------------- 536// Gather LiveRanGe information, including register masks. Modification of 537// cisc spillable in_RegMasks should not be done before AggressiveCoalesce. 538void PhaseChaitin::gather_lrg_masks( bool after_aggressive ) { 539 540 // Nail down the frame pointer live range 541 uint fp_lrg = n2lidx(_cfg._root->in(1)->in(TypeFunc::FramePtr)); 542 lrgs(fp_lrg)._cost += 1e12; // Cost is infinite 543 544 // For all blocks 545 for( uint i = 0; i < _cfg._num_blocks; i++ ) { 546 Block *b = _cfg._blocks[i]; 547 548 // For all instructions 549 for( uint j = 1; j < b->_nodes.size(); j++ ) { 550 Node *n = b->_nodes[j]; 551 uint input_edge_start =1; // Skip control most nodes 552 if( n->is_Mach() ) input_edge_start = n->as_Mach()->oper_input_base(); 553 uint idx = n->is_Copy(); 554 555 // Get virtual register number, same as LiveRanGe index 556 uint vreg = n2lidx(n); 557 LRG &lrg = lrgs(vreg); 558 if( vreg ) { // No vreg means un-allocable (e.g. memory) 559 560 // Collect has-copy bit 561 if( idx ) { 562 lrg._has_copy = 1; 563 uint clidx = n2lidx(n->in(idx)); 564 LRG ©_src = lrgs(clidx); 565 copy_src._has_copy = 1; 566 } 567 568 // Check for float-vs-int live range (used in register-pressure 569 // calculations) 570 const Type *n_type = n->bottom_type(); 571 if( n_type->is_floatingpoint() ) 572 lrg._is_float = 1; 573 574 // Check for twice prior spilling. Once prior spilling might have 575 // spilled 'soft', 2nd prior spill should have spilled 'hard' and 576 // further spilling is unlikely to make progress. 577 if( _spilled_once.test(n->_idx) ) { 578 lrg._was_spilled1 = 1; 579 if( _spilled_twice.test(n->_idx) ) 580 lrg._was_spilled2 = 1; 581 } 582 583#ifndef PRODUCT 584 if (trace_spilling() && lrg._def != NULL) { 585 // collect defs for MultiDef printing 586 if (lrg._defs == NULL) { 587 lrg._defs = new (_ifg->_arena) GrowableArray<Node*>(_ifg->_arena, 2, 0, NULL); 588 lrg._defs->append(lrg._def); 589 } 590 lrg._defs->append(n); 591 } 592#endif 593 594 // Check for a single def LRG; these can spill nicely 595 // via rematerialization. Flag as NULL for no def found 596 // yet, or 'n' for single def or -1 for many defs. 597 lrg._def = lrg._def ? NodeSentinel : n; 598 599 // Limit result register mask to acceptable registers 600 const RegMask &rm = n->out_RegMask(); 601 lrg.AND( rm ); 602 // Check for bound register masks 603 const RegMask &lrgmask = lrg.mask(); 604 if( lrgmask.is_bound1() || lrgmask.is_bound2() ) 605 lrg._is_bound = 1; 606 607 // Check for maximum frequency value 608 if( lrg._maxfreq < b->_freq ) 609 lrg._maxfreq = b->_freq; 610 611 int ireg = n->ideal_reg(); 612 assert( !n->bottom_type()->isa_oop_ptr() || ireg == Op_RegP, 613 "oops must be in Op_RegP's" ); 614 // Check for oop-iness, or long/double 615 // Check for multi-kill projection 616 switch( ireg ) { 617 case MachProjNode::fat_proj: 618 // Fat projections have size equal to number of registers killed 619 lrg.set_num_regs(rm.Size()); 620 lrg.set_reg_pressure(lrg.num_regs()); 621 lrg._fat_proj = 1; 622 lrg._is_bound = 1; 623 break; 624 case Op_RegP: 625#ifdef _LP64 626 lrg.set_num_regs(2); // Size is 2 stack words 627#else 628 lrg.set_num_regs(1); // Size is 1 stack word 629#endif 630 // Register pressure is tracked relative to the maximum values 631 // suggested for that platform, INTPRESSURE and FLOATPRESSURE, 632 // and relative to other types which compete for the same regs. 633 // 634 // The following table contains suggested values based on the 635 // architectures as defined in each .ad file. 636 // INTPRESSURE and FLOATPRESSURE may be tuned differently for 637 // compile-speed or performance. 638 // Note1: 639 // SPARC and SPARCV9 reg_pressures are at 2 instead of 1 640 // since .ad registers are defined as high and low halves. 641 // These reg_pressure values remain compatible with the code 642 // in is_high_pressure() which relates get_invalid_mask_size(), 643 // Block::_reg_pressure and INTPRESSURE, FLOATPRESSURE. 644 // Note2: 645 // SPARC -d32 has 24 registers available for integral values, 646 // but only 10 of these are safe for 64-bit longs. 647 // Using set_reg_pressure(2) for both int and long means 648 // the allocator will believe it can fit 26 longs into 649 // registers. Using 2 for longs and 1 for ints means the 650 // allocator will attempt to put 52 integers into registers. 651 // The settings below limit this problem to methods with 652 // many long values which are being run on 32-bit SPARC. 653 // 654 // ------------------- reg_pressure -------------------- 655 // Each entry is reg_pressure_per_value,number_of_regs 656 // RegL RegI RegFlags RegF RegD INTPRESSURE FLOATPRESSURE 657 // IA32 2 1 1 1 1 6 6 658 // IA64 1 1 1 1 1 50 41 659 // SPARC 2 2 2 2 2 48 (24) 52 (26) 660 // SPARCV9 2 2 2 2 2 48 (24) 52 (26) 661 // AMD64 1 1 1 1 1 14 15 662 // ----------------------------------------------------- 663#if defined(SPARC) 664 lrg.set_reg_pressure(2); // use for v9 as well 665#else 666 lrg.set_reg_pressure(1); // normally one value per register 667#endif 668 if( n_type->isa_oop_ptr() ) { 669 lrg._is_oop = 1; 670 } 671 break; 672 case Op_RegL: // Check for long or double 673 case Op_RegD: 674 lrg.set_num_regs(2); 675 // Define platform specific register pressure 676#if defined(SPARC) || defined(ARM) 677 lrg.set_reg_pressure(2); 678#elif defined(IA32) 679 if( ireg == Op_RegL ) { 680 lrg.set_reg_pressure(2); 681 } else { 682 lrg.set_reg_pressure(1); 683 } 684#else 685 lrg.set_reg_pressure(1); // normally one value per register 686#endif 687 // If this def of a double forces a mis-aligned double, 688 // flag as '_fat_proj' - really flag as allowing misalignment 689 // AND changes how we count interferences. A mis-aligned 690 // double can interfere with TWO aligned pairs, or effectively 691 // FOUR registers! 692 if( rm.is_misaligned_Pair() ) { 693 lrg._fat_proj = 1; 694 lrg._is_bound = 1; 695 } 696 break; 697 case Op_RegF: 698 case Op_RegI: 699 case Op_RegN: 700 case Op_RegFlags: 701 case 0: // not an ideal register 702 lrg.set_num_regs(1); 703#ifdef SPARC 704 lrg.set_reg_pressure(2); 705#else 706 lrg.set_reg_pressure(1); 707#endif 708 break; 709 default: 710 ShouldNotReachHere(); 711 } 712 } 713 714 // Now do the same for inputs 715 uint cnt = n->req(); 716 // Setup for CISC SPILLING 717 uint inp = (uint)AdlcVMDeps::Not_cisc_spillable; 718 if( UseCISCSpill && after_aggressive ) { 719 inp = n->cisc_operand(); 720 if( inp != (uint)AdlcVMDeps::Not_cisc_spillable ) 721 // Convert operand number to edge index number 722 inp = n->as_Mach()->operand_index(inp); 723 } 724 // Prepare register mask for each input 725 for( uint k = input_edge_start; k < cnt; k++ ) { 726 uint vreg = n2lidx(n->in(k)); 727 if( !vreg ) continue; 728 729 // If this instruction is CISC Spillable, add the flags 730 // bit to its appropriate input 731 if( UseCISCSpill && after_aggressive && inp == k ) { 732#ifndef PRODUCT 733 if( TraceCISCSpill ) { 734 tty->print(" use_cisc_RegMask: "); 735 n->dump(); 736 } 737#endif 738 n->as_Mach()->use_cisc_RegMask(); 739 } 740 741 LRG &lrg = lrgs(vreg); 742 // // Testing for floating point code shape 743 // Node *test = n->in(k); 744 // if( test->is_Mach() ) { 745 // MachNode *m = test->as_Mach(); 746 // int op = m->ideal_Opcode(); 747 // if (n->is_Call() && (op == Op_AddF || op == Op_MulF) ) { 748 // int zzz = 1; 749 // } 750 // } 751 752 // Limit result register mask to acceptable registers. 753 // Do not limit registers from uncommon uses before 754 // AggressiveCoalesce. This effectively pre-virtual-splits 755 // around uncommon uses of common defs. 756 const RegMask &rm = n->in_RegMask(k); 757 if( !after_aggressive && 758 _cfg._bbs[n->in(k)->_idx]->_freq > 1000*b->_freq ) { 759 // Since we are BEFORE aggressive coalesce, leave the register 760 // mask untrimmed by the call. This encourages more coalescing. 761 // Later, AFTER aggressive, this live range will have to spill 762 // but the spiller handles slow-path calls very nicely. 763 } else { 764 lrg.AND( rm ); 765 } 766 // Check for bound register masks 767 const RegMask &lrgmask = lrg.mask(); 768 if( lrgmask.is_bound1() || lrgmask.is_bound2() ) 769 lrg._is_bound = 1; 770 // If this use of a double forces a mis-aligned double, 771 // flag as '_fat_proj' - really flag as allowing misalignment 772 // AND changes how we count interferences. A mis-aligned 773 // double can interfere with TWO aligned pairs, or effectively 774 // FOUR registers! 775 if( lrg.num_regs() == 2 && !lrg._fat_proj && rm.is_misaligned_Pair() ) { 776 lrg._fat_proj = 1; 777 lrg._is_bound = 1; 778 } 779 // if the LRG is an unaligned pair, we will have to spill 780 // so clear the LRG's register mask if it is not already spilled 781 if ( !n->is_SpillCopy() && 782 (lrg._def == NULL || lrg.is_multidef() || !lrg._def->is_SpillCopy()) && 783 lrgmask.is_misaligned_Pair()) { 784 lrg.Clear(); 785 } 786 787 // Check for maximum frequency value 788 if( lrg._maxfreq < b->_freq ) 789 lrg._maxfreq = b->_freq; 790 791 } // End for all allocated inputs 792 } // end for all instructions 793 } // end for all blocks 794 795 // Final per-liverange setup 796 for( uint i2=0; i2<_maxlrg; i2++ ) { 797 LRG &lrg = lrgs(i2); 798 if( lrg.num_regs() == 2 && !lrg._fat_proj ) 799 lrg.ClearToPairs(); 800 lrg.compute_set_mask_size(); 801 if( lrg.not_free() ) { // Handle case where we lose from the start 802 lrg.set_reg(OptoReg::Name(LRG::SPILL_REG)); 803 lrg._direct_conflict = 1; 804 } 805 lrg.set_degree(0); // no neighbors in IFG yet 806 } 807} 808 809//------------------------------set_was_low------------------------------------ 810// Set the was-lo-degree bit. Conservative coalescing should not change the 811// colorability of the graph. If any live range was of low-degree before 812// coalescing, it should Simplify. This call sets the was-lo-degree bit. 813// The bit is checked in Simplify. 814void PhaseChaitin::set_was_low() { 815#ifdef ASSERT 816 for( uint i = 1; i < _maxlrg; i++ ) { 817 int size = lrgs(i).num_regs(); 818 uint old_was_lo = lrgs(i)._was_lo; 819 lrgs(i)._was_lo = 0; 820 if( lrgs(i).lo_degree() ) { 821 lrgs(i)._was_lo = 1; // Trivially of low degree 822 } else { // Else check the Brigg's assertion 823 // Brigg's observation is that the lo-degree neighbors of a 824 // hi-degree live range will not interfere with the color choices 825 // of said hi-degree live range. The Simplify reverse-stack-coloring 826 // order takes care of the details. Hence you do not have to count 827 // low-degree neighbors when determining if this guy colors. 828 int briggs_degree = 0; 829 IndexSet *s = _ifg->neighbors(i); 830 IndexSetIterator elements(s); 831 uint lidx; 832 while((lidx = elements.next()) != 0) { 833 if( !lrgs(lidx).lo_degree() ) 834 briggs_degree += MAX2(size,lrgs(lidx).num_regs()); 835 } 836 if( briggs_degree < lrgs(i).degrees_of_freedom() ) 837 lrgs(i)._was_lo = 1; // Low degree via the briggs assertion 838 } 839 assert(old_was_lo <= lrgs(i)._was_lo, "_was_lo may not decrease"); 840 } 841#endif 842} 843 844#define REGISTER_CONSTRAINED 16 845 846//------------------------------cache_lrg_info--------------------------------- 847// Compute cost/area ratio, in case we spill. Build the lo-degree list. 848void PhaseChaitin::cache_lrg_info( ) { 849 850 for( uint i = 1; i < _maxlrg; i++ ) { 851 LRG &lrg = lrgs(i); 852 853 // Check for being of low degree: means we can be trivially colored. 854 // Low degree, dead or must-spill guys just get to simplify right away 855 if( lrg.lo_degree() || 856 !lrg.alive() || 857 lrg._must_spill ) { 858 // Split low degree list into those guys that must get a 859 // register and those that can go to register or stack. 860 // The idea is LRGs that can go register or stack color first when 861 // they have a good chance of getting a register. The register-only 862 // lo-degree live ranges always get a register. 863 OptoReg::Name hi_reg = lrg.mask().find_last_elem(); 864 if( OptoReg::is_stack(hi_reg)) { // Can go to stack? 865 lrg._next = _lo_stk_degree; 866 _lo_stk_degree = i; 867 } else { 868 lrg._next = _lo_degree; 869 _lo_degree = i; 870 } 871 } else { // Else high degree 872 lrgs(_hi_degree)._prev = i; 873 lrg._next = _hi_degree; 874 lrg._prev = 0; 875 _hi_degree = i; 876 } 877 } 878} 879 880//------------------------------Pre-Simplify----------------------------------- 881// Simplify the IFG by removing LRGs of low degree that have NO copies 882void PhaseChaitin::Pre_Simplify( ) { 883 884 // Warm up the lo-degree no-copy list 885 int lo_no_copy = 0; 886 for( uint i = 1; i < _maxlrg; i++ ) { 887 if( (lrgs(i).lo_degree() && !lrgs(i)._has_copy) || 888 !lrgs(i).alive() || 889 lrgs(i)._must_spill ) { 890 lrgs(i)._next = lo_no_copy; 891 lo_no_copy = i; 892 } 893 } 894 895 while( lo_no_copy ) { 896 uint lo = lo_no_copy; 897 lo_no_copy = lrgs(lo)._next; 898 int size = lrgs(lo).num_regs(); 899 900 // Put the simplified guy on the simplified list. 901 lrgs(lo)._next = _simplified; 902 _simplified = lo; 903 904 // Yank this guy from the IFG. 905 IndexSet *adj = _ifg->remove_node( lo ); 906 907 // If any neighbors' degrees fall below their number of 908 // allowed registers, then put that neighbor on the low degree 909 // list. Note that 'degree' can only fall and 'numregs' is 910 // unchanged by this action. Thus the two are equal at most once, 911 // so LRGs hit the lo-degree worklists at most once. 912 IndexSetIterator elements(adj); 913 uint neighbor; 914 while ((neighbor = elements.next()) != 0) { 915 LRG *n = &lrgs(neighbor); 916 assert( _ifg->effective_degree(neighbor) == n->degree(), "" ); 917 918 // Check for just becoming of-low-degree 919 if( n->just_lo_degree() && !n->_has_copy ) { 920 assert(!(*_ifg->_yanked)[neighbor],"Cannot move to lo degree twice"); 921 // Put on lo-degree list 922 n->_next = lo_no_copy; 923 lo_no_copy = neighbor; 924 } 925 } 926 } // End of while lo-degree no_copy worklist not empty 927 928 // No more lo-degree no-copy live ranges to simplify 929} 930 931//------------------------------Simplify--------------------------------------- 932// Simplify the IFG by removing LRGs of low degree. 933void PhaseChaitin::Simplify( ) { 934 935 while( 1 ) { // Repeat till simplified it all 936 // May want to explore simplifying lo_degree before _lo_stk_degree. 937 // This might result in more spills coloring into registers during 938 // Select(). 939 while( _lo_degree || _lo_stk_degree ) { 940 // If possible, pull from lo_stk first 941 uint lo; 942 if( _lo_degree ) { 943 lo = _lo_degree; 944 _lo_degree = lrgs(lo)._next; 945 } else { 946 lo = _lo_stk_degree; 947 _lo_stk_degree = lrgs(lo)._next; 948 } 949 950 // Put the simplified guy on the simplified list. 951 lrgs(lo)._next = _simplified; 952 _simplified = lo; 953 // If this guy is "at risk" then mark his current neighbors 954 if( lrgs(lo)._at_risk ) { 955 IndexSetIterator elements(_ifg->neighbors(lo)); 956 uint datum; 957 while ((datum = elements.next()) != 0) { 958 lrgs(datum)._risk_bias = lo; 959 } 960 } 961 962 // Yank this guy from the IFG. 963 IndexSet *adj = _ifg->remove_node( lo ); 964 965 // If any neighbors' degrees fall below their number of 966 // allowed registers, then put that neighbor on the low degree 967 // list. Note that 'degree' can only fall and 'numregs' is 968 // unchanged by this action. Thus the two are equal at most once, 969 // so LRGs hit the lo-degree worklist at most once. 970 IndexSetIterator elements(adj); 971 uint neighbor; 972 while ((neighbor = elements.next()) != 0) { 973 LRG *n = &lrgs(neighbor); 974#ifdef ASSERT 975 if( VerifyOpto || VerifyRegisterAllocator ) { 976 assert( _ifg->effective_degree(neighbor) == n->degree(), "" ); 977 } 978#endif 979 980 // Check for just becoming of-low-degree just counting registers. 981 // _must_spill live ranges are already on the low degree list. 982 if( n->just_lo_degree() && !n->_must_spill ) { 983 assert(!(*_ifg->_yanked)[neighbor],"Cannot move to lo degree twice"); 984 // Pull from hi-degree list 985 uint prev = n->_prev; 986 uint next = n->_next; 987 if( prev ) lrgs(prev)._next = next; 988 else _hi_degree = next; 989 lrgs(next)._prev = prev; 990 n->_next = _lo_degree; 991 _lo_degree = neighbor; 992 } 993 } 994 } // End of while lo-degree/lo_stk_degree worklist not empty 995 996 // Check for got everything: is hi-degree list empty? 997 if( !_hi_degree ) break; 998 999 // Time to pick a potential spill guy 1000 uint lo_score = _hi_degree; 1001 double score = lrgs(lo_score).score(); 1002 double area = lrgs(lo_score)._area; 1003 double cost = lrgs(lo_score)._cost; 1004 bool bound = lrgs(lo_score)._is_bound; 1005 1006 // Find cheapest guy 1007 debug_only( int lo_no_simplify=0; ); 1008 for( uint i = _hi_degree; i; i = lrgs(i)._next ) { 1009 assert( !(*_ifg->_yanked)[i], "" ); 1010 // It's just vaguely possible to move hi-degree to lo-degree without 1011 // going through a just-lo-degree stage: If you remove a double from 1012 // a float live range it's degree will drop by 2 and you can skip the 1013 // just-lo-degree stage. It's very rare (shows up after 5000+ methods 1014 // in -Xcomp of Java2Demo). So just choose this guy to simplify next. 1015 if( lrgs(i).lo_degree() ) { 1016 lo_score = i; 1017 break; 1018 } 1019 debug_only( if( lrgs(i)._was_lo ) lo_no_simplify=i; ); 1020 double iscore = lrgs(i).score(); 1021 double iarea = lrgs(i)._area; 1022 double icost = lrgs(i)._cost; 1023 bool ibound = lrgs(i)._is_bound; 1024 1025 // Compare cost/area of i vs cost/area of lo_score. Smaller cost/area 1026 // wins. Ties happen because all live ranges in question have spilled 1027 // a few times before and the spill-score adds a huge number which 1028 // washes out the low order bits. We are choosing the lesser of 2 1029 // evils; in this case pick largest area to spill. 1030 // Ties also happen when live ranges are defined and used only inside 1031 // one block. In which case their area is 0 and score set to max. 1032 // In such case choose bound live range over unbound to free registers 1033 // or with smaller cost to spill. 1034 if( iscore < score || 1035 (iscore == score && iarea > area && lrgs(lo_score)._was_spilled2) || 1036 (iscore == score && iarea == area && 1037 ( (ibound && !bound) || ibound == bound && (icost < cost) )) ) { 1038 lo_score = i; 1039 score = iscore; 1040 area = iarea; 1041 cost = icost; 1042 bound = ibound; 1043 } 1044 } 1045 LRG *lo_lrg = &lrgs(lo_score); 1046 // The live range we choose for spilling is either hi-degree, or very 1047 // rarely it can be low-degree. If we choose a hi-degree live range 1048 // there better not be any lo-degree choices. 1049 assert( lo_lrg->lo_degree() || !lo_no_simplify, "Live range was lo-degree before coalesce; should simplify" ); 1050 1051 // Pull from hi-degree list 1052 uint prev = lo_lrg->_prev; 1053 uint next = lo_lrg->_next; 1054 if( prev ) lrgs(prev)._next = next; 1055 else _hi_degree = next; 1056 lrgs(next)._prev = prev; 1057 // Jam him on the lo-degree list, despite his high degree. 1058 // Maybe he'll get a color, and maybe he'll spill. 1059 // Only Select() will know. 1060 lrgs(lo_score)._at_risk = true; 1061 _lo_degree = lo_score; 1062 lo_lrg->_next = 0; 1063 1064 } // End of while not simplified everything 1065 1066} 1067 1068//------------------------------bias_color------------------------------------- 1069// Choose a color using the biasing heuristic 1070OptoReg::Name PhaseChaitin::bias_color( LRG &lrg, int chunk ) { 1071 1072 // Check for "at_risk" LRG's 1073 uint risk_lrg = Find(lrg._risk_bias); 1074 if( risk_lrg != 0 ) { 1075 // Walk the colored neighbors of the "at_risk" candidate 1076 // Choose a color which is both legal and already taken by a neighbor 1077 // of the "at_risk" candidate in order to improve the chances of the 1078 // "at_risk" candidate of coloring 1079 IndexSetIterator elements(_ifg->neighbors(risk_lrg)); 1080 uint datum; 1081 while ((datum = elements.next()) != 0) { 1082 OptoReg::Name reg = lrgs(datum).reg(); 1083 // If this LRG's register is legal for us, choose it 1084 if( reg >= chunk && reg < chunk + RegMask::CHUNK_SIZE && 1085 lrg.mask().Member(OptoReg::add(reg,-chunk)) && 1086 (lrg.num_regs()==1 || // either size 1 1087 (reg&1) == 1) ) // or aligned (adjacent reg is available since we already cleared-to-pairs) 1088 return reg; 1089 } 1090 } 1091 1092 uint copy_lrg = Find(lrg._copy_bias); 1093 if( copy_lrg != 0 ) { 1094 // If he has a color, 1095 if( !(*(_ifg->_yanked))[copy_lrg] ) { 1096 OptoReg::Name reg = lrgs(copy_lrg).reg(); 1097 // And it is legal for you, 1098 if( reg >= chunk && reg < chunk + RegMask::CHUNK_SIZE && 1099 lrg.mask().Member(OptoReg::add(reg,-chunk)) && 1100 (lrg.num_regs()==1 || // either size 1 1101 (reg&1) == 1) ) // or aligned (adjacent reg is available since we already cleared-to-pairs) 1102 return reg; 1103 } else if( chunk == 0 ) { 1104 // Choose a color which is legal for him 1105 RegMask tempmask = lrg.mask(); 1106 tempmask.AND(lrgs(copy_lrg).mask()); 1107 OptoReg::Name reg; 1108 if( lrg.num_regs() == 1 ) { 1109 reg = tempmask.find_first_elem(); 1110 } else { 1111 tempmask.ClearToPairs(); 1112 reg = tempmask.find_first_pair(); 1113 } 1114 if( OptoReg::is_valid(reg) ) 1115 return reg; 1116 } 1117 } 1118 1119 // If no bias info exists, just go with the register selection ordering 1120 if( lrg.num_regs() == 2 ) { 1121 // Find an aligned pair 1122 return OptoReg::add(lrg.mask().find_first_pair(),chunk); 1123 } 1124 1125 // CNC - Fun hack. Alternate 1st and 2nd selection. Enables post-allocate 1126 // copy removal to remove many more copies, by preventing a just-assigned 1127 // register from being repeatedly assigned. 1128 OptoReg::Name reg = lrg.mask().find_first_elem(); 1129 if( (++_alternate & 1) && OptoReg::is_valid(reg) ) { 1130 // This 'Remove; find; Insert' idiom is an expensive way to find the 1131 // SECOND element in the mask. 1132 lrg.Remove(reg); 1133 OptoReg::Name reg2 = lrg.mask().find_first_elem(); 1134 lrg.Insert(reg); 1135 if( OptoReg::is_reg(reg2)) 1136 reg = reg2; 1137 } 1138 return OptoReg::add( reg, chunk ); 1139} 1140 1141//------------------------------choose_color----------------------------------- 1142// Choose a color in the current chunk 1143OptoReg::Name PhaseChaitin::choose_color( LRG &lrg, int chunk ) { 1144 assert( C->in_preserve_stack_slots() == 0 || chunk != 0 || lrg._is_bound || lrg.mask().is_bound1() || !lrg.mask().Member(OptoReg::Name(_matcher._old_SP-1)), "must not allocate stack0 (inside preserve area)"); 1145 assert(C->out_preserve_stack_slots() == 0 || chunk != 0 || lrg._is_bound || lrg.mask().is_bound1() || !lrg.mask().Member(OptoReg::Name(_matcher._old_SP+0)), "must not allocate stack0 (inside preserve area)"); 1146 1147 if( lrg.num_regs() == 1 || // Common Case 1148 !lrg._fat_proj ) // Aligned+adjacent pairs ok 1149 // Use a heuristic to "bias" the color choice 1150 return bias_color(lrg, chunk); 1151 1152 assert( lrg.num_regs() >= 2, "dead live ranges do not color" ); 1153 1154 // Fat-proj case or misaligned double argument. 1155 assert(lrg.compute_mask_size() == lrg.num_regs() || 1156 lrg.num_regs() == 2,"fat projs exactly color" ); 1157 assert( !chunk, "always color in 1st chunk" ); 1158 // Return the highest element in the set. 1159 return lrg.mask().find_last_elem(); 1160} 1161 1162//------------------------------Select----------------------------------------- 1163// Select colors by re-inserting LRGs back into the IFG. LRGs are re-inserted 1164// in reverse order of removal. As long as nothing of hi-degree was yanked, 1165// everything going back is guaranteed a color. Select that color. If some 1166// hi-degree LRG cannot get a color then we record that we must spill. 1167uint PhaseChaitin::Select( ) { 1168 uint spill_reg = LRG::SPILL_REG; 1169 _max_reg = OptoReg::Name(0); // Past max register used 1170 while( _simplified ) { 1171 // Pull next LRG from the simplified list - in reverse order of removal 1172 uint lidx = _simplified; 1173 LRG *lrg = &lrgs(lidx); 1174 _simplified = lrg->_next; 1175 1176 1177#ifndef PRODUCT 1178 if (trace_spilling()) { 1179 ttyLocker ttyl; 1180 tty->print_cr("L%d selecting degree %d degrees_of_freedom %d", lidx, lrg->degree(), 1181 lrg->degrees_of_freedom()); 1182 lrg->dump(); 1183 } 1184#endif 1185 1186 // Re-insert into the IFG 1187 _ifg->re_insert(lidx); 1188 if( !lrg->alive() ) continue; 1189 // capture allstackedness flag before mask is hacked 1190 const int is_allstack = lrg->mask().is_AllStack(); 1191 1192 // Yeah, yeah, yeah, I know, I know. I can refactor this 1193 // to avoid the GOTO, although the refactored code will not 1194 // be much clearer. We arrive here IFF we have a stack-based 1195 // live range that cannot color in the current chunk, and it 1196 // has to move into the next free stack chunk. 1197 int chunk = 0; // Current chunk is first chunk 1198 retry_next_chunk: 1199 1200 // Remove neighbor colors 1201 IndexSet *s = _ifg->neighbors(lidx); 1202 1203 debug_only(RegMask orig_mask = lrg->mask();) 1204 IndexSetIterator elements(s); 1205 uint neighbor; 1206 while ((neighbor = elements.next()) != 0) { 1207 // Note that neighbor might be a spill_reg. In this case, exclusion 1208 // of its color will be a no-op, since the spill_reg chunk is in outer 1209 // space. Also, if neighbor is in a different chunk, this exclusion 1210 // will be a no-op. (Later on, if lrg runs out of possible colors in 1211 // its chunk, a new chunk of color may be tried, in which case 1212 // examination of neighbors is started again, at retry_next_chunk.) 1213 LRG &nlrg = lrgs(neighbor); 1214 OptoReg::Name nreg = nlrg.reg(); 1215 // Only subtract masks in the same chunk 1216 if( nreg >= chunk && nreg < chunk + RegMask::CHUNK_SIZE ) { 1217#ifndef PRODUCT 1218 uint size = lrg->mask().Size(); 1219 RegMask rm = lrg->mask(); 1220#endif 1221 lrg->SUBTRACT(nlrg.mask()); 1222#ifndef PRODUCT 1223 if (trace_spilling() && lrg->mask().Size() != size) { 1224 ttyLocker ttyl; 1225 tty->print("L%d ", lidx); 1226 rm.dump(); 1227 tty->print(" intersected L%d ", neighbor); 1228 nlrg.mask().dump(); 1229 tty->print(" removed "); 1230 rm.SUBTRACT(lrg->mask()); 1231 rm.dump(); 1232 tty->print(" leaving "); 1233 lrg->mask().dump(); 1234 tty->cr(); 1235 } 1236#endif 1237 } 1238 } 1239 //assert(is_allstack == lrg->mask().is_AllStack(), "nbrs must not change AllStackedness"); 1240 // Aligned pairs need aligned masks 1241 if( lrg->num_regs() == 2 && !lrg->_fat_proj ) 1242 lrg->ClearToPairs(); 1243 1244 // Check if a color is available and if so pick the color 1245 OptoReg::Name reg = choose_color( *lrg, chunk ); 1246#ifdef SPARC 1247 debug_only(lrg->compute_set_mask_size()); 1248 assert(lrg->num_regs() != 2 || lrg->is_bound() || is_even(reg-1), "allocate all doubles aligned"); 1249#endif 1250 1251 //--------------- 1252 // If we fail to color and the AllStack flag is set, trigger 1253 // a chunk-rollover event 1254 if(!OptoReg::is_valid(OptoReg::add(reg,-chunk)) && is_allstack) { 1255 // Bump register mask up to next stack chunk 1256 chunk += RegMask::CHUNK_SIZE; 1257 lrg->Set_All(); 1258 1259 goto retry_next_chunk; 1260 } 1261 1262 //--------------- 1263 // Did we get a color? 1264 else if( OptoReg::is_valid(reg)) { 1265#ifndef PRODUCT 1266 RegMask avail_rm = lrg->mask(); 1267#endif 1268 1269 // Record selected register 1270 lrg->set_reg(reg); 1271 1272 if( reg >= _max_reg ) // Compute max register limit 1273 _max_reg = OptoReg::add(reg,1); 1274 // Fold reg back into normal space 1275 reg = OptoReg::add(reg,-chunk); 1276 1277 // If the live range is not bound, then we actually had some choices 1278 // to make. In this case, the mask has more bits in it than the colors 1279 // chosen. Restrict the mask to just what was picked. 1280 if( lrg->num_regs() == 1 ) { // Size 1 live range 1281 lrg->Clear(); // Clear the mask 1282 lrg->Insert(reg); // Set regmask to match selected reg 1283 lrg->set_mask_size(1); 1284 } else if( !lrg->_fat_proj ) { 1285 // For pairs, also insert the low bit of the pair 1286 assert( lrg->num_regs() == 2, "unbound fatproj???" ); 1287 lrg->Clear(); // Clear the mask 1288 lrg->Insert(reg); // Set regmask to match selected reg 1289 lrg->Insert(OptoReg::add(reg,-1)); 1290 lrg->set_mask_size(2); 1291 } else { // Else fatproj 1292 // mask must be equal to fatproj bits, by definition 1293 } 1294#ifndef PRODUCT 1295 if (trace_spilling()) { 1296 ttyLocker ttyl; 1297 tty->print("L%d selected ", lidx); 1298 lrg->mask().dump(); 1299 tty->print(" from "); 1300 avail_rm.dump(); 1301 tty->cr(); 1302 } 1303#endif 1304 // Note that reg is the highest-numbered register in the newly-bound mask. 1305 } // end color available case 1306 1307 //--------------- 1308 // Live range is live and no colors available 1309 else { 1310 assert( lrg->alive(), "" ); 1311 assert( !lrg->_fat_proj || lrg->is_multidef() || 1312 lrg->_def->outcnt() > 0, "fat_proj cannot spill"); 1313 assert( !orig_mask.is_AllStack(), "All Stack does not spill" ); 1314 1315 // Assign the special spillreg register 1316 lrg->set_reg(OptoReg::Name(spill_reg++)); 1317 // Do not empty the regmask; leave mask_size lying around 1318 // for use during Spilling 1319#ifndef PRODUCT 1320 if( trace_spilling() ) { 1321 ttyLocker ttyl; 1322 tty->print("L%d spilling with neighbors: ", lidx); 1323 s->dump(); 1324 debug_only(tty->print(" original mask: ")); 1325 debug_only(orig_mask.dump()); 1326 dump_lrg(lidx); 1327 } 1328#endif 1329 } // end spill case 1330 1331 } 1332 1333 return spill_reg-LRG::SPILL_REG; // Return number of spills 1334} 1335 1336 1337//------------------------------copy_was_spilled------------------------------- 1338// Copy 'was_spilled'-edness from the source Node to the dst Node. 1339void PhaseChaitin::copy_was_spilled( Node *src, Node *dst ) { 1340 if( _spilled_once.test(src->_idx) ) { 1341 _spilled_once.set(dst->_idx); 1342 lrgs(Find(dst))._was_spilled1 = 1; 1343 if( _spilled_twice.test(src->_idx) ) { 1344 _spilled_twice.set(dst->_idx); 1345 lrgs(Find(dst))._was_spilled2 = 1; 1346 } 1347 } 1348} 1349 1350//------------------------------set_was_spilled-------------------------------- 1351// Set the 'spilled_once' or 'spilled_twice' flag on a node. 1352void PhaseChaitin::set_was_spilled( Node *n ) { 1353 if( _spilled_once.test_set(n->_idx) ) 1354 _spilled_twice.set(n->_idx); 1355} 1356 1357//------------------------------fixup_spills----------------------------------- 1358// Convert Ideal spill instructions into proper FramePtr + offset Loads and 1359// Stores. Use-def chains are NOT preserved, but Node->LRG->reg maps are. 1360void PhaseChaitin::fixup_spills() { 1361 // This function does only cisc spill work. 1362 if( !UseCISCSpill ) return; 1363 1364 NOT_PRODUCT( Compile::TracePhase t3("fixupSpills", &_t_fixupSpills, TimeCompiler); ) 1365 1366 // Grab the Frame Pointer 1367 Node *fp = _cfg._broot->head()->in(1)->in(TypeFunc::FramePtr); 1368 1369 // For all blocks 1370 for( uint i = 0; i < _cfg._num_blocks; i++ ) { 1371 Block *b = _cfg._blocks[i]; 1372 1373 // For all instructions in block 1374 uint last_inst = b->end_idx(); 1375 for( uint j = 1; j <= last_inst; j++ ) { 1376 Node *n = b->_nodes[j]; 1377 1378 // Dead instruction??? 1379 assert( n->outcnt() != 0 ||// Nothing dead after post alloc 1380 C->top() == n || // Or the random TOP node 1381 n->is_Proj(), // Or a fat-proj kill node 1382 "No dead instructions after post-alloc" ); 1383 1384 int inp = n->cisc_operand(); 1385 if( inp != AdlcVMDeps::Not_cisc_spillable ) { 1386 // Convert operand number to edge index number 1387 MachNode *mach = n->as_Mach(); 1388 inp = mach->operand_index(inp); 1389 Node *src = n->in(inp); // Value to load or store 1390 LRG &lrg_cisc = lrgs( Find_const(src) ); 1391 OptoReg::Name src_reg = lrg_cisc.reg(); 1392 // Doubles record the HIGH register of an adjacent pair. 1393 src_reg = OptoReg::add(src_reg,1-lrg_cisc.num_regs()); 1394 if( OptoReg::is_stack(src_reg) ) { // If input is on stack 1395 // This is a CISC Spill, get stack offset and construct new node 1396#ifndef PRODUCT 1397 if( TraceCISCSpill ) { 1398 tty->print(" reg-instr: "); 1399 n->dump(); 1400 } 1401#endif 1402 int stk_offset = reg2offset(src_reg); 1403 // Bailout if we might exceed node limit when spilling this instruction 1404 C->check_node_count(0, "out of nodes fixing spills"); 1405 if (C->failing()) return; 1406 // Transform node 1407 MachNode *cisc = mach->cisc_version(stk_offset, C)->as_Mach(); 1408 cisc->set_req(inp,fp); // Base register is frame pointer 1409 if( cisc->oper_input_base() > 1 && mach->oper_input_base() <= 1 ) { 1410 assert( cisc->oper_input_base() == 2, "Only adding one edge"); 1411 cisc->ins_req(1,src); // Requires a memory edge 1412 } 1413 b->_nodes.map(j,cisc); // Insert into basic block 1414 n->subsume_by(cisc); // Correct graph 1415 // 1416 ++_used_cisc_instructions; 1417#ifndef PRODUCT 1418 if( TraceCISCSpill ) { 1419 tty->print(" cisc-instr: "); 1420 cisc->dump(); 1421 } 1422#endif 1423 } else { 1424#ifndef PRODUCT 1425 if( TraceCISCSpill ) { 1426 tty->print(" using reg-instr: "); 1427 n->dump(); 1428 } 1429#endif 1430 ++_unused_cisc_instructions; // input can be on stack 1431 } 1432 } 1433 1434 } // End of for all instructions 1435 1436 } // End of for all blocks 1437} 1438 1439//------------------------------find_base_for_derived-------------------------- 1440// Helper to stretch above; recursively discover the base Node for a 1441// given derived Node. Easy for AddP-related machine nodes, but needs 1442// to be recursive for derived Phis. 1443Node *PhaseChaitin::find_base_for_derived( Node **derived_base_map, Node *derived, uint &maxlrg ) { 1444 // See if already computed; if so return it 1445 if( derived_base_map[derived->_idx] ) 1446 return derived_base_map[derived->_idx]; 1447 1448 // See if this happens to be a base. 1449 // NOTE: we use TypePtr instead of TypeOopPtr because we can have 1450 // pointers derived from NULL! These are always along paths that 1451 // can't happen at run-time but the optimizer cannot deduce it so 1452 // we have to handle it gracefully. 1453 assert(!derived->bottom_type()->isa_narrowoop() || 1454 derived->bottom_type()->make_ptr()->is_ptr()->_offset == 0, "sanity"); 1455 const TypePtr *tj = derived->bottom_type()->isa_ptr(); 1456 // If its an OOP with a non-zero offset, then it is derived. 1457 if( tj == NULL || tj->_offset == 0 ) { 1458 derived_base_map[derived->_idx] = derived; 1459 return derived; 1460 } 1461 // Derived is NULL+offset? Base is NULL! 1462 if( derived->is_Con() ) { 1463 Node *base = _matcher.mach_null(); 1464 assert(base != NULL, "sanity"); 1465 if (base->in(0) == NULL) { 1466 // Initialize it once and make it shared: 1467 // set control to _root and place it into Start block 1468 // (where top() node is placed). 1469 base->init_req(0, _cfg._root); 1470 Block *startb = _cfg._bbs[C->top()->_idx]; 1471 startb->_nodes.insert(startb->find_node(C->top()), base ); 1472 _cfg._bbs.map( base->_idx, startb ); 1473 assert (n2lidx(base) == 0, "should not have LRG yet"); 1474 } 1475 if (n2lidx(base) == 0) { 1476 new_lrg(base, maxlrg++); 1477 } 1478 assert(base->in(0) == _cfg._root && 1479 _cfg._bbs[base->_idx] == _cfg._bbs[C->top()->_idx], "base NULL should be shared"); 1480 derived_base_map[derived->_idx] = base; 1481 return base; 1482 } 1483 1484 // Check for AddP-related opcodes 1485 if( !derived->is_Phi() ) { 1486 assert( derived->as_Mach()->ideal_Opcode() == Op_AddP, "" ); 1487 Node *base = derived->in(AddPNode::Base); 1488 derived_base_map[derived->_idx] = base; 1489 return base; 1490 } 1491 1492 // Recursively find bases for Phis. 1493 // First check to see if we can avoid a base Phi here. 1494 Node *base = find_base_for_derived( derived_base_map, derived->in(1),maxlrg); 1495 uint i; 1496 for( i = 2; i < derived->req(); i++ ) 1497 if( base != find_base_for_derived( derived_base_map,derived->in(i),maxlrg)) 1498 break; 1499 // Went to the end without finding any different bases? 1500 if( i == derived->req() ) { // No need for a base Phi here 1501 derived_base_map[derived->_idx] = base; 1502 return base; 1503 } 1504 1505 // Now we see we need a base-Phi here to merge the bases 1506 const Type *t = base->bottom_type(); 1507 base = new (C, derived->req()) PhiNode( derived->in(0), t ); 1508 for( i = 1; i < derived->req(); i++ ) { 1509 base->init_req(i, find_base_for_derived(derived_base_map, derived->in(i), maxlrg)); 1510 t = t->meet(base->in(i)->bottom_type()); 1511 } 1512 base->as_Phi()->set_type(t); 1513 1514 // Search the current block for an existing base-Phi 1515 Block *b = _cfg._bbs[derived->_idx]; 1516 for( i = 1; i <= b->end_idx(); i++ ) {// Search for matching Phi 1517 Node *phi = b->_nodes[i]; 1518 if( !phi->is_Phi() ) { // Found end of Phis with no match? 1519 b->_nodes.insert( i, base ); // Must insert created Phi here as base 1520 _cfg._bbs.map( base->_idx, b ); 1521 new_lrg(base,maxlrg++); 1522 break; 1523 } 1524 // See if Phi matches. 1525 uint j; 1526 for( j = 1; j < base->req(); j++ ) 1527 if( phi->in(j) != base->in(j) && 1528 !(phi->in(j)->is_Con() && base->in(j)->is_Con()) ) // allow different NULLs 1529 break; 1530 if( j == base->req() ) { // All inputs match? 1531 base = phi; // Then use existing 'phi' and drop 'base' 1532 break; 1533 } 1534 } 1535 1536 1537 // Cache info for later passes 1538 derived_base_map[derived->_idx] = base; 1539 return base; 1540} 1541 1542 1543//------------------------------stretch_base_pointer_live_ranges--------------- 1544// At each Safepoint, insert extra debug edges for each pair of derived value/ 1545// base pointer that is live across the Safepoint for oopmap building. The 1546// edge pairs get added in after sfpt->jvmtail()->oopoff(), but are in the 1547// required edge set. 1548bool PhaseChaitin::stretch_base_pointer_live_ranges( ResourceArea *a ) { 1549 int must_recompute_live = false; 1550 uint maxlrg = _maxlrg; 1551 Node **derived_base_map = (Node**)a->Amalloc(sizeof(Node*)*C->unique()); 1552 memset( derived_base_map, 0, sizeof(Node*)*C->unique() ); 1553 1554 // For all blocks in RPO do... 1555 for( uint i=0; i<_cfg._num_blocks; i++ ) { 1556 Block *b = _cfg._blocks[i]; 1557 // Note use of deep-copy constructor. I cannot hammer the original 1558 // liveout bits, because they are needed by the following coalesce pass. 1559 IndexSet liveout(_live->live(b)); 1560 1561 for( uint j = b->end_idx() + 1; j > 1; j-- ) { 1562 Node *n = b->_nodes[j-1]; 1563 1564 // Pre-split compares of loop-phis. Loop-phis form a cycle we would 1565 // like to see in the same register. Compare uses the loop-phi and so 1566 // extends its live range BUT cannot be part of the cycle. If this 1567 // extended live range overlaps with the update of the loop-phi value 1568 // we need both alive at the same time -- which requires at least 1 1569 // copy. But because Intel has only 2-address registers we end up with 1570 // at least 2 copies, one before the loop-phi update instruction and 1571 // one after. Instead we split the input to the compare just after the 1572 // phi. 1573 if( n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_CmpI ) { 1574 Node *phi = n->in(1); 1575 if( phi->is_Phi() && phi->as_Phi()->region()->is_Loop() ) { 1576 Block *phi_block = _cfg._bbs[phi->_idx]; 1577 if( _cfg._bbs[phi_block->pred(2)->_idx] == b ) { 1578 const RegMask *mask = C->matcher()->idealreg2spillmask[Op_RegI]; 1579 Node *spill = new (C) MachSpillCopyNode( phi, *mask, *mask ); 1580 insert_proj( phi_block, 1, spill, maxlrg++ ); 1581 n->set_req(1,spill); 1582 must_recompute_live = true; 1583 } 1584 } 1585 } 1586 1587 // Get value being defined 1588 uint lidx = n2lidx(n); 1589 if( lidx && lidx < _maxlrg /* Ignore the occasional brand-new live range */) { 1590 // Remove from live-out set 1591 liveout.remove(lidx); 1592 1593 // Copies do not define a new value and so do not interfere. 1594 // Remove the copies source from the liveout set before interfering. 1595 uint idx = n->is_Copy(); 1596 if( idx ) liveout.remove( n2lidx(n->in(idx)) ); 1597 } 1598 1599 // Found a safepoint? 1600 JVMState *jvms = n->jvms(); 1601 if( jvms ) { 1602 // Now scan for a live derived pointer 1603 IndexSetIterator elements(&liveout); 1604 uint neighbor; 1605 while ((neighbor = elements.next()) != 0) { 1606 // Find reaching DEF for base and derived values 1607 // This works because we are still in SSA during this call. 1608 Node *derived = lrgs(neighbor)._def; 1609 const TypePtr *tj = derived->bottom_type()->isa_ptr(); 1610 assert(!derived->bottom_type()->isa_narrowoop() || 1611 derived->bottom_type()->make_ptr()->is_ptr()->_offset == 0, "sanity"); 1612 // If its an OOP with a non-zero offset, then it is derived. 1613 if( tj && tj->_offset != 0 && tj->isa_oop_ptr() ) { 1614 Node *base = find_base_for_derived( derived_base_map, derived, maxlrg ); 1615 assert( base->_idx < _names.Size(), "" ); 1616 // Add reaching DEFs of derived pointer and base pointer as a 1617 // pair of inputs 1618 n->add_req( derived ); 1619 n->add_req( base ); 1620 1621 // See if the base pointer is already live to this point. 1622 // Since I'm working on the SSA form, live-ness amounts to 1623 // reaching def's. So if I find the base's live range then 1624 // I know the base's def reaches here. 1625 if( (n2lidx(base) >= _maxlrg ||// (Brand new base (hence not live) or 1626 !liveout.member( n2lidx(base) ) ) && // not live) AND 1627 (n2lidx(base) > 0) && // not a constant 1628 _cfg._bbs[base->_idx] != b ) { // base not def'd in blk) 1629 // Base pointer is not currently live. Since I stretched 1630 // the base pointer to here and it crosses basic-block 1631 // boundaries, the global live info is now incorrect. 1632 // Recompute live. 1633 must_recompute_live = true; 1634 } // End of if base pointer is not live to debug info 1635 } 1636 } // End of scan all live data for derived ptrs crossing GC point 1637 } // End of if found a GC point 1638 1639 // Make all inputs live 1640 if( !n->is_Phi() ) { // Phi function uses come from prior block 1641 for( uint k = 1; k < n->req(); k++ ) { 1642 uint lidx = n2lidx(n->in(k)); 1643 if( lidx < _maxlrg ) 1644 liveout.insert( lidx ); 1645 } 1646 } 1647 1648 } // End of forall instructions in block 1649 liveout.clear(); // Free the memory used by liveout. 1650 1651 } // End of forall blocks 1652 _maxlrg = maxlrg; 1653 1654 // If I created a new live range I need to recompute live 1655 if( maxlrg != _ifg->_maxlrg ) 1656 must_recompute_live = true; 1657 1658 return must_recompute_live != 0; 1659} 1660 1661 1662//------------------------------add_reference---------------------------------- 1663// Extend the node to LRG mapping 1664void PhaseChaitin::add_reference( const Node *node, const Node *old_node ) { 1665 _names.extend( node->_idx, n2lidx(old_node) ); 1666} 1667 1668//------------------------------dump------------------------------------------- 1669#ifndef PRODUCT 1670void PhaseChaitin::dump( const Node *n ) const { 1671 uint r = (n->_idx < _names.Size() ) ? Find_const(n) : 0; 1672 tty->print("L%d",r); 1673 if( r && n->Opcode() != Op_Phi ) { 1674 if( _node_regs ) { // Got a post-allocation copy of allocation? 1675 tty->print("["); 1676 OptoReg::Name second = get_reg_second(n); 1677 if( OptoReg::is_valid(second) ) { 1678 if( OptoReg::is_reg(second) ) 1679 tty->print("%s:",Matcher::regName[second]); 1680 else 1681 tty->print("%s+%d:",OptoReg::regname(OptoReg::c_frame_pointer), reg2offset_unchecked(second)); 1682 } 1683 OptoReg::Name first = get_reg_first(n); 1684 if( OptoReg::is_reg(first) ) 1685 tty->print("%s]",Matcher::regName[first]); 1686 else 1687 tty->print("%s+%d]",OptoReg::regname(OptoReg::c_frame_pointer), reg2offset_unchecked(first)); 1688 } else 1689 n->out_RegMask().dump(); 1690 } 1691 tty->print("/N%d\t",n->_idx); 1692 tty->print("%s === ", n->Name()); 1693 uint k; 1694 for( k = 0; k < n->req(); k++) { 1695 Node *m = n->in(k); 1696 if( !m ) tty->print("_ "); 1697 else { 1698 uint r = (m->_idx < _names.Size() ) ? Find_const(m) : 0; 1699 tty->print("L%d",r); 1700 // Data MultiNode's can have projections with no real registers. 1701 // Don't die while dumping them. 1702 int op = n->Opcode(); 1703 if( r && op != Op_Phi && op != Op_Proj && op != Op_SCMemProj) { 1704 if( _node_regs ) { 1705 tty->print("["); 1706 OptoReg::Name second = get_reg_second(n->in(k)); 1707 if( OptoReg::is_valid(second) ) { 1708 if( OptoReg::is_reg(second) ) 1709 tty->print("%s:",Matcher::regName[second]); 1710 else 1711 tty->print("%s+%d:",OptoReg::regname(OptoReg::c_frame_pointer), 1712 reg2offset_unchecked(second)); 1713 } 1714 OptoReg::Name first = get_reg_first(n->in(k)); 1715 if( OptoReg::is_reg(first) ) 1716 tty->print("%s]",Matcher::regName[first]); 1717 else 1718 tty->print("%s+%d]",OptoReg::regname(OptoReg::c_frame_pointer), 1719 reg2offset_unchecked(first)); 1720 } else 1721 n->in_RegMask(k).dump(); 1722 } 1723 tty->print("/N%d ",m->_idx); 1724 } 1725 } 1726 if( k < n->len() && n->in(k) ) tty->print("| "); 1727 for( ; k < n->len(); k++ ) { 1728 Node *m = n->in(k); 1729 if( !m ) break; 1730 uint r = (m->_idx < _names.Size() ) ? Find_const(m) : 0; 1731 tty->print("L%d",r); 1732 tty->print("/N%d ",m->_idx); 1733 } 1734 if( n->is_Mach() ) n->as_Mach()->dump_spec(tty); 1735 else n->dump_spec(tty); 1736 if( _spilled_once.test(n->_idx ) ) { 1737 tty->print(" Spill_1"); 1738 if( _spilled_twice.test(n->_idx ) ) 1739 tty->print(" Spill_2"); 1740 } 1741 tty->print("\n"); 1742} 1743 1744void PhaseChaitin::dump( const Block * b ) const { 1745 b->dump_head( &_cfg._bbs ); 1746 1747 // For all instructions 1748 for( uint j = 0; j < b->_nodes.size(); j++ ) 1749 dump(b->_nodes[j]); 1750 // Print live-out info at end of block 1751 if( _live ) { 1752 tty->print("Liveout: "); 1753 IndexSet *live = _live->live(b); 1754 IndexSetIterator elements(live); 1755 tty->print("{"); 1756 uint i; 1757 while ((i = elements.next()) != 0) { 1758 tty->print("L%d ", Find_const(i)); 1759 } 1760 tty->print_cr("}"); 1761 } 1762 tty->print("\n"); 1763} 1764 1765void PhaseChaitin::dump() const { 1766 tty->print( "--- Chaitin -- argsize: %d framesize: %d ---\n", 1767 _matcher._new_SP, _framesize ); 1768 1769 // For all blocks 1770 for( uint i = 0; i < _cfg._num_blocks; i++ ) 1771 dump(_cfg._blocks[i]); 1772 // End of per-block dump 1773 tty->print("\n"); 1774 1775 if (!_ifg) { 1776 tty->print("(No IFG.)\n"); 1777 return; 1778 } 1779 1780 // Dump LRG array 1781 tty->print("--- Live RanGe Array ---\n"); 1782 for(uint i2 = 1; i2 < _maxlrg; i2++ ) { 1783 tty->print("L%d: ",i2); 1784 if( i2 < _ifg->_maxlrg ) lrgs(i2).dump( ); 1785 else tty->print_cr("new LRG"); 1786 } 1787 tty->print_cr(""); 1788 1789 // Dump lo-degree list 1790 tty->print("Lo degree: "); 1791 for(uint i3 = _lo_degree; i3; i3 = lrgs(i3)._next ) 1792 tty->print("L%d ",i3); 1793 tty->print_cr(""); 1794 1795 // Dump lo-stk-degree list 1796 tty->print("Lo stk degree: "); 1797 for(uint i4 = _lo_stk_degree; i4; i4 = lrgs(i4)._next ) 1798 tty->print("L%d ",i4); 1799 tty->print_cr(""); 1800 1801 // Dump lo-degree list 1802 tty->print("Hi degree: "); 1803 for(uint i5 = _hi_degree; i5; i5 = lrgs(i5)._next ) 1804 tty->print("L%d ",i5); 1805 tty->print_cr(""); 1806} 1807 1808//------------------------------dump_degree_lists------------------------------ 1809void PhaseChaitin::dump_degree_lists() const { 1810 // Dump lo-degree list 1811 tty->print("Lo degree: "); 1812 for( uint i = _lo_degree; i; i = lrgs(i)._next ) 1813 tty->print("L%d ",i); 1814 tty->print_cr(""); 1815 1816 // Dump lo-stk-degree list 1817 tty->print("Lo stk degree: "); 1818 for(uint i2 = _lo_stk_degree; i2; i2 = lrgs(i2)._next ) 1819 tty->print("L%d ",i2); 1820 tty->print_cr(""); 1821 1822 // Dump lo-degree list 1823 tty->print("Hi degree: "); 1824 for(uint i3 = _hi_degree; i3; i3 = lrgs(i3)._next ) 1825 tty->print("L%d ",i3); 1826 tty->print_cr(""); 1827} 1828 1829//------------------------------dump_simplified-------------------------------- 1830void PhaseChaitin::dump_simplified() const { 1831 tty->print("Simplified: "); 1832 for( uint i = _simplified; i; i = lrgs(i)._next ) 1833 tty->print("L%d ",i); 1834 tty->print_cr(""); 1835} 1836 1837static char *print_reg( OptoReg::Name reg, const PhaseChaitin *pc, char *buf ) { 1838 if ((int)reg < 0) 1839 sprintf(buf, "<OptoReg::%d>", (int)reg); 1840 else if (OptoReg::is_reg(reg)) 1841 strcpy(buf, Matcher::regName[reg]); 1842 else 1843 sprintf(buf,"%s + #%d",OptoReg::regname(OptoReg::c_frame_pointer), 1844 pc->reg2offset(reg)); 1845 return buf+strlen(buf); 1846} 1847 1848//------------------------------dump_register---------------------------------- 1849// Dump a register name into a buffer. Be intelligent if we get called 1850// before allocation is complete. 1851char *PhaseChaitin::dump_register( const Node *n, char *buf ) const { 1852 if( !this ) { // Not got anything? 1853 sprintf(buf,"N%d",n->_idx); // Then use Node index 1854 } else if( _node_regs ) { 1855 // Post allocation, use direct mappings, no LRG info available 1856 print_reg( get_reg_first(n), this, buf ); 1857 } else { 1858 uint lidx = Find_const(n); // Grab LRG number 1859 if( !_ifg ) { 1860 sprintf(buf,"L%d",lidx); // No register binding yet 1861 } else if( !lidx ) { // Special, not allocated value 1862 strcpy(buf,"Special"); 1863 } else if( (lrgs(lidx).num_regs() == 1) 1864 ? !lrgs(lidx).mask().is_bound1() 1865 : !lrgs(lidx).mask().is_bound2() ) { 1866 sprintf(buf,"L%d",lidx); // No register binding yet 1867 } else { // Hah! We have a bound machine register 1868 print_reg( lrgs(lidx).reg(), this, buf ); 1869 } 1870 } 1871 return buf+strlen(buf); 1872} 1873 1874//----------------------dump_for_spill_split_recycle-------------------------- 1875void PhaseChaitin::dump_for_spill_split_recycle() const { 1876 if( WizardMode && (PrintCompilation || PrintOpto) ) { 1877 // Display which live ranges need to be split and the allocator's state 1878 tty->print_cr("Graph-Coloring Iteration %d will split the following live ranges", _trip_cnt); 1879 for( uint bidx = 1; bidx < _maxlrg; bidx++ ) { 1880 if( lrgs(bidx).alive() && lrgs(bidx).reg() >= LRG::SPILL_REG ) { 1881 tty->print("L%d: ", bidx); 1882 lrgs(bidx).dump(); 1883 } 1884 } 1885 tty->cr(); 1886 dump(); 1887 } 1888} 1889 1890//------------------------------dump_frame------------------------------------ 1891void PhaseChaitin::dump_frame() const { 1892 const char *fp = OptoReg::regname(OptoReg::c_frame_pointer); 1893 const TypeTuple *domain = C->tf()->domain(); 1894 const int argcnt = domain->cnt() - TypeFunc::Parms; 1895 1896 // Incoming arguments in registers dump 1897 for( int k = 0; k < argcnt; k++ ) { 1898 OptoReg::Name parmreg = _matcher._parm_regs[k].first(); 1899 if( OptoReg::is_reg(parmreg)) { 1900 const char *reg_name = OptoReg::regname(parmreg); 1901 tty->print("#r%3.3d %s", parmreg, reg_name); 1902 parmreg = _matcher._parm_regs[k].second(); 1903 if( OptoReg::is_reg(parmreg)) { 1904 tty->print(":%s", OptoReg::regname(parmreg)); 1905 } 1906 tty->print(" : parm %d: ", k); 1907 domain->field_at(k + TypeFunc::Parms)->dump(); 1908 tty->print_cr(""); 1909 } 1910 } 1911 1912 // Check for un-owned padding above incoming args 1913 OptoReg::Name reg = _matcher._new_SP; 1914 if( reg > _matcher._in_arg_limit ) { 1915 reg = OptoReg::add(reg, -1); 1916 tty->print_cr("#r%3.3d %s+%2d: pad0, owned by CALLER", reg, fp, reg2offset_unchecked(reg)); 1917 } 1918 1919 // Incoming argument area dump 1920 OptoReg::Name begin_in_arg = OptoReg::add(_matcher._old_SP,C->out_preserve_stack_slots()); 1921 while( reg > begin_in_arg ) { 1922 reg = OptoReg::add(reg, -1); 1923 tty->print("#r%3.3d %s+%2d: ",reg,fp,reg2offset_unchecked(reg)); 1924 int j; 1925 for( j = 0; j < argcnt; j++) { 1926 if( _matcher._parm_regs[j].first() == reg || 1927 _matcher._parm_regs[j].second() == reg ) { 1928 tty->print("parm %d: ",j); 1929 domain->field_at(j + TypeFunc::Parms)->dump(); 1930 tty->print_cr(""); 1931 break; 1932 } 1933 } 1934 if( j >= argcnt ) 1935 tty->print_cr("HOLE, owned by SELF"); 1936 } 1937 1938 // Old outgoing preserve area 1939 while( reg > _matcher._old_SP ) { 1940 reg = OptoReg::add(reg, -1); 1941 tty->print_cr("#r%3.3d %s+%2d: old out preserve",reg,fp,reg2offset_unchecked(reg)); 1942 } 1943 1944 // Old SP 1945 tty->print_cr("# -- Old %s -- Framesize: %d --",fp, 1946 reg2offset_unchecked(OptoReg::add(_matcher._old_SP,-1)) - reg2offset_unchecked(_matcher._new_SP)+jintSize); 1947 1948 // Preserve area dump 1949 int fixed_slots = C->fixed_slots(); 1950 OptoReg::Name begin_in_preserve = OptoReg::add(_matcher._old_SP, -(int)C->in_preserve_stack_slots()); 1951 OptoReg::Name return_addr = _matcher.return_addr(); 1952 1953 reg = OptoReg::add(reg, -1); 1954 while (OptoReg::is_stack(reg)) { 1955 tty->print("#r%3.3d %s+%2d: ",reg,fp,reg2offset_unchecked(reg)); 1956 if (return_addr == reg) { 1957 tty->print_cr("return address"); 1958 } else if (reg >= begin_in_preserve) { 1959 // Preserved slots are present on x86 1960 if (return_addr == OptoReg::add(reg, VMRegImpl::slots_per_word)) 1961 tty->print_cr("saved fp register"); 1962 else if (return_addr == OptoReg::add(reg, 2*VMRegImpl::slots_per_word) && 1963 VerifyStackAtCalls) 1964 tty->print_cr("0xBADB100D +VerifyStackAtCalls"); 1965 else 1966 tty->print_cr("in_preserve"); 1967 } else if ((int)OptoReg::reg2stack(reg) < fixed_slots) { 1968 tty->print_cr("Fixed slot %d", OptoReg::reg2stack(reg)); 1969 } else { 1970 tty->print_cr("pad2, stack alignment"); 1971 } 1972 reg = OptoReg::add(reg, -1); 1973 } 1974 1975 // Spill area dump 1976 reg = OptoReg::add(_matcher._new_SP, _framesize ); 1977 while( reg > _matcher._out_arg_limit ) { 1978 reg = OptoReg::add(reg, -1); 1979 tty->print_cr("#r%3.3d %s+%2d: spill",reg,fp,reg2offset_unchecked(reg)); 1980 } 1981 1982 // Outgoing argument area dump 1983 while( reg > OptoReg::add(_matcher._new_SP, C->out_preserve_stack_slots()) ) { 1984 reg = OptoReg::add(reg, -1); 1985 tty->print_cr("#r%3.3d %s+%2d: outgoing argument",reg,fp,reg2offset_unchecked(reg)); 1986 } 1987 1988 // Outgoing new preserve area 1989 while( reg > _matcher._new_SP ) { 1990 reg = OptoReg::add(reg, -1); 1991 tty->print_cr("#r%3.3d %s+%2d: new out preserve",reg,fp,reg2offset_unchecked(reg)); 1992 } 1993 tty->print_cr("#"); 1994} 1995 1996//------------------------------dump_bb---------------------------------------- 1997void PhaseChaitin::dump_bb( uint pre_order ) const { 1998 tty->print_cr("---dump of B%d---",pre_order); 1999 for( uint i = 0; i < _cfg._num_blocks; i++ ) { 2000 Block *b = _cfg._blocks[i]; 2001 if( b->_pre_order == pre_order ) 2002 dump(b); 2003 } 2004} 2005 2006//------------------------------dump_lrg--------------------------------------- 2007void PhaseChaitin::dump_lrg( uint lidx, bool defs_only ) const { 2008 tty->print_cr("---dump of L%d---",lidx); 2009 2010 if( _ifg ) { 2011 if( lidx >= _maxlrg ) { 2012 tty->print("Attempt to print live range index beyond max live range.\n"); 2013 return; 2014 } 2015 tty->print("L%d: ",lidx); 2016 if( lidx < _ifg->_maxlrg ) lrgs(lidx).dump( ); 2017 else tty->print_cr("new LRG"); 2018 } 2019 if( _ifg && lidx < _ifg->_maxlrg) { 2020 tty->print("Neighbors: %d - ", _ifg->neighbor_cnt(lidx)); 2021 _ifg->neighbors(lidx)->dump(); 2022 tty->cr(); 2023 } 2024 // For all blocks 2025 for( uint i = 0; i < _cfg._num_blocks; i++ ) { 2026 Block *b = _cfg._blocks[i]; 2027 int dump_once = 0; 2028 2029 // For all instructions 2030 for( uint j = 0; j < b->_nodes.size(); j++ ) { 2031 Node *n = b->_nodes[j]; 2032 if( Find_const(n) == lidx ) { 2033 if( !dump_once++ ) { 2034 tty->cr(); 2035 b->dump_head( &_cfg._bbs ); 2036 } 2037 dump(n); 2038 continue; 2039 } 2040 if (!defs_only) { 2041 uint cnt = n->req(); 2042 for( uint k = 1; k < cnt; k++ ) { 2043 Node *m = n->in(k); 2044 if (!m) continue; // be robust in the dumper 2045 if( Find_const(m) == lidx ) { 2046 if( !dump_once++ ) { 2047 tty->cr(); 2048 b->dump_head( &_cfg._bbs ); 2049 } 2050 dump(n); 2051 } 2052 } 2053 } 2054 } 2055 } // End of per-block dump 2056 tty->cr(); 2057} 2058#endif // not PRODUCT 2059 2060//------------------------------print_chaitin_statistics------------------------------- 2061int PhaseChaitin::_final_loads = 0; 2062int PhaseChaitin::_final_stores = 0; 2063int PhaseChaitin::_final_memoves= 0; 2064int PhaseChaitin::_final_copies = 0; 2065double PhaseChaitin::_final_load_cost = 0; 2066double PhaseChaitin::_final_store_cost = 0; 2067double PhaseChaitin::_final_memove_cost= 0; 2068double PhaseChaitin::_final_copy_cost = 0; 2069int PhaseChaitin::_conserv_coalesce = 0; 2070int PhaseChaitin::_conserv_coalesce_pair = 0; 2071int PhaseChaitin::_conserv_coalesce_trie = 0; 2072int PhaseChaitin::_conserv_coalesce_quad = 0; 2073int PhaseChaitin::_post_alloc = 0; 2074int PhaseChaitin::_lost_opp_pp_coalesce = 0; 2075int PhaseChaitin::_lost_opp_cflow_coalesce = 0; 2076int PhaseChaitin::_used_cisc_instructions = 0; 2077int PhaseChaitin::_unused_cisc_instructions = 0; 2078int PhaseChaitin::_allocator_attempts = 0; 2079int PhaseChaitin::_allocator_successes = 0; 2080 2081#ifndef PRODUCT 2082uint PhaseChaitin::_high_pressure = 0; 2083uint PhaseChaitin::_low_pressure = 0; 2084 2085void PhaseChaitin::print_chaitin_statistics() { 2086 tty->print_cr("Inserted %d spill loads, %d spill stores, %d mem-mem moves and %d copies.", _final_loads, _final_stores, _final_memoves, _final_copies); 2087 tty->print_cr("Total load cost= %6.0f, store cost = %6.0f, mem-mem cost = %5.2f, copy cost = %5.0f.", _final_load_cost, _final_store_cost, _final_memove_cost, _final_copy_cost); 2088 tty->print_cr("Adjusted spill cost = %7.0f.", 2089 _final_load_cost*4.0 + _final_store_cost * 2.0 + 2090 _final_copy_cost*1.0 + _final_memove_cost*12.0); 2091 tty->print("Conservatively coalesced %d copies, %d pairs", 2092 _conserv_coalesce, _conserv_coalesce_pair); 2093 if( _conserv_coalesce_trie || _conserv_coalesce_quad ) 2094 tty->print(", %d tries, %d quads", _conserv_coalesce_trie, _conserv_coalesce_quad); 2095 tty->print_cr(", %d post alloc.", _post_alloc); 2096 if( _lost_opp_pp_coalesce || _lost_opp_cflow_coalesce ) 2097 tty->print_cr("Lost coalesce opportunity, %d private-private, and %d cflow interfered.", 2098 _lost_opp_pp_coalesce, _lost_opp_cflow_coalesce ); 2099 if( _used_cisc_instructions || _unused_cisc_instructions ) 2100 tty->print_cr("Used cisc instruction %d, remained in register %d", 2101 _used_cisc_instructions, _unused_cisc_instructions); 2102 if( _allocator_successes != 0 ) 2103 tty->print_cr("Average allocation trips %f", (float)_allocator_attempts/(float)_allocator_successes); 2104 tty->print_cr("High Pressure Blocks = %d, Low Pressure Blocks = %d", _high_pressure, _low_pressure); 2105} 2106#endif // not PRODUCT 2107