Mercurial > hg > truffle
annotate src/share/vm/opto/phaseX.cpp @ 7196:2aff40cb4703
7092905: C2: Keep track of the number of dead nodes
Summary: keep an (almost) accurate running count of the reachable (live) flow graph nodes.
Reviewed-by: kvn, twisti, jrose, vlivanov
| author | bharadwaj |
|---|---|
| date | Tue, 27 Nov 2012 17:24:15 -0800 |
| parents | b9a9ed0f8eeb |
| children | d092d1b31229 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "memory/allocation.inline.hpp" | |
| 27 #include "opto/block.hpp" | |
| 28 #include "opto/callnode.hpp" | |
| 29 #include "opto/cfgnode.hpp" | |
| 30 #include "opto/connode.hpp" | |
| 31 #include "opto/idealGraphPrinter.hpp" | |
| 32 #include "opto/loopnode.hpp" | |
| 33 #include "opto/machnode.hpp" | |
| 34 #include "opto/opcodes.hpp" | |
| 35 #include "opto/phaseX.hpp" | |
| 36 #include "opto/regalloc.hpp" | |
| 37 #include "opto/rootnode.hpp" | |
| 0 | 38 |
| 39 //============================================================================= | |
| 40 #define NODE_HASH_MINIMUM_SIZE 255 | |
| 41 //------------------------------NodeHash--------------------------------------- | |
| 42 NodeHash::NodeHash(uint est_max_size) : | |
| 43 _max( round_up(est_max_size < NODE_HASH_MINIMUM_SIZE ? NODE_HASH_MINIMUM_SIZE : est_max_size) ), | |
| 44 _a(Thread::current()->resource_area()), | |
| 45 _table( NEW_ARENA_ARRAY( _a , Node* , _max ) ), // (Node**)_a->Amalloc(_max * sizeof(Node*)) ), | |
| 46 _inserts(0), _insert_limit( insert_limit() ), | |
| 47 _look_probes(0), _lookup_hits(0), _lookup_misses(0), | |
| 48 _total_insert_probes(0), _total_inserts(0), | |
| 49 _insert_probes(0), _grows(0) { | |
| 50 // _sentinel must be in the current node space | |
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51 _sentinel = new (Compile::current()) ProjNode(NULL, TypeFunc::Control); |
| 0 | 52 memset(_table,0,sizeof(Node*)*_max); |
| 53 } | |
| 54 | |
| 55 //------------------------------NodeHash--------------------------------------- | |
| 56 NodeHash::NodeHash(Arena *arena, uint est_max_size) : | |
| 57 _max( round_up(est_max_size < NODE_HASH_MINIMUM_SIZE ? NODE_HASH_MINIMUM_SIZE : est_max_size) ), | |
| 58 _a(arena), | |
| 59 _table( NEW_ARENA_ARRAY( _a , Node* , _max ) ), | |
| 60 _inserts(0), _insert_limit( insert_limit() ), | |
| 61 _look_probes(0), _lookup_hits(0), _lookup_misses(0), | |
| 62 _delete_probes(0), _delete_hits(0), _delete_misses(0), | |
| 63 _total_insert_probes(0), _total_inserts(0), | |
| 64 _insert_probes(0), _grows(0) { | |
| 65 // _sentinel must be in the current node space | |
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66 _sentinel = new (Compile::current()) ProjNode(NULL, TypeFunc::Control); |
| 0 | 67 memset(_table,0,sizeof(Node*)*_max); |
| 68 } | |
| 69 | |
| 70 //------------------------------NodeHash--------------------------------------- | |
| 71 NodeHash::NodeHash(NodeHash *nh) { | |
| 72 debug_only(_table = (Node**)badAddress); // interact correctly w/ operator= | |
| 73 // just copy in all the fields | |
| 74 *this = *nh; | |
| 75 // nh->_sentinel must be in the current node space | |
| 76 } | |
| 77 | |
| 78 //------------------------------hash_find-------------------------------------- | |
| 79 // Find in hash table | |
| 80 Node *NodeHash::hash_find( const Node *n ) { | |
| 81 // ((Node*)n)->set_hash( n->hash() ); | |
| 82 uint hash = n->hash(); | |
| 83 if (hash == Node::NO_HASH) { | |
| 84 debug_only( _lookup_misses++ ); | |
| 85 return NULL; | |
| 86 } | |
| 87 uint key = hash & (_max-1); | |
| 88 uint stride = key | 0x01; | |
| 89 debug_only( _look_probes++ ); | |
| 90 Node *k = _table[key]; // Get hashed value | |
| 91 if( !k ) { // ?Miss? | |
| 92 debug_only( _lookup_misses++ ); | |
| 93 return NULL; // Miss! | |
| 94 } | |
| 95 | |
| 96 int op = n->Opcode(); | |
| 97 uint req = n->req(); | |
| 98 while( 1 ) { // While probing hash table | |
| 99 if( k->req() == req && // Same count of inputs | |
| 100 k->Opcode() == op ) { // Same Opcode | |
| 101 for( uint i=0; i<req; i++ ) | |
| 102 if( n->in(i)!=k->in(i)) // Different inputs? | |
| 103 goto collision; // "goto" is a speed hack... | |
| 104 if( n->cmp(*k) ) { // Check for any special bits | |
| 105 debug_only( _lookup_hits++ ); | |
| 106 return k; // Hit! | |
| 107 } | |
| 108 } | |
| 109 collision: | |
| 110 debug_only( _look_probes++ ); | |
| 111 key = (key + stride/*7*/) & (_max-1); // Stride through table with relative prime | |
| 112 k = _table[key]; // Get hashed value | |
| 113 if( !k ) { // ?Miss? | |
| 114 debug_only( _lookup_misses++ ); | |
| 115 return NULL; // Miss! | |
| 116 } | |
| 117 } | |
| 118 ShouldNotReachHere(); | |
| 119 return NULL; | |
| 120 } | |
| 121 | |
| 122 //------------------------------hash_find_insert------------------------------- | |
| 123 // Find in hash table, insert if not already present | |
| 124 // Used to preserve unique entries in hash table | |
| 125 Node *NodeHash::hash_find_insert( Node *n ) { | |
| 126 // n->set_hash( ); | |
| 127 uint hash = n->hash(); | |
| 128 if (hash == Node::NO_HASH) { | |
| 129 debug_only( _lookup_misses++ ); | |
| 130 return NULL; | |
| 131 } | |
| 132 uint key = hash & (_max-1); | |
| 133 uint stride = key | 0x01; // stride must be relatively prime to table siz | |
| 134 uint first_sentinel = 0; // replace a sentinel if seen. | |
| 135 debug_only( _look_probes++ ); | |
| 136 Node *k = _table[key]; // Get hashed value | |
| 137 if( !k ) { // ?Miss? | |
| 138 debug_only( _lookup_misses++ ); | |
| 139 _table[key] = n; // Insert into table! | |
| 140 debug_only(n->enter_hash_lock()); // Lock down the node while in the table. | |
| 141 check_grow(); // Grow table if insert hit limit | |
| 142 return NULL; // Miss! | |
| 143 } | |
| 144 else if( k == _sentinel ) { | |
| 145 first_sentinel = key; // Can insert here | |
| 146 } | |
| 147 | |
| 148 int op = n->Opcode(); | |
| 149 uint req = n->req(); | |
| 150 while( 1 ) { // While probing hash table | |
| 151 if( k->req() == req && // Same count of inputs | |
| 152 k->Opcode() == op ) { // Same Opcode | |
| 153 for( uint i=0; i<req; i++ ) | |
| 154 if( n->in(i)!=k->in(i)) // Different inputs? | |
| 155 goto collision; // "goto" is a speed hack... | |
| 156 if( n->cmp(*k) ) { // Check for any special bits | |
| 157 debug_only( _lookup_hits++ ); | |
| 158 return k; // Hit! | |
| 159 } | |
| 160 } | |
| 161 collision: | |
| 162 debug_only( _look_probes++ ); | |
| 163 key = (key + stride) & (_max-1); // Stride through table w/ relative prime | |
| 164 k = _table[key]; // Get hashed value | |
| 165 if( !k ) { // ?Miss? | |
| 166 debug_only( _lookup_misses++ ); | |
| 167 key = (first_sentinel == 0) ? key : first_sentinel; // ?saw sentinel? | |
| 168 _table[key] = n; // Insert into table! | |
| 169 debug_only(n->enter_hash_lock()); // Lock down the node while in the table. | |
| 170 check_grow(); // Grow table if insert hit limit | |
| 171 return NULL; // Miss! | |
| 172 } | |
| 173 else if( first_sentinel == 0 && k == _sentinel ) { | |
| 174 first_sentinel = key; // Can insert here | |
| 175 } | |
| 176 | |
| 177 } | |
| 178 ShouldNotReachHere(); | |
| 179 return NULL; | |
| 180 } | |
| 181 | |
| 182 //------------------------------hash_insert------------------------------------ | |
| 183 // Insert into hash table | |
| 184 void NodeHash::hash_insert( Node *n ) { | |
| 185 // // "conflict" comments -- print nodes that conflict | |
| 186 // bool conflict = false; | |
| 187 // n->set_hash(); | |
| 188 uint hash = n->hash(); | |
| 189 if (hash == Node::NO_HASH) { | |
| 190 return; | |
| 191 } | |
| 192 check_grow(); | |
| 193 uint key = hash & (_max-1); | |
| 194 uint stride = key | 0x01; | |
| 195 | |
| 196 while( 1 ) { // While probing hash table | |
| 197 debug_only( _insert_probes++ ); | |
| 198 Node *k = _table[key]; // Get hashed value | |
| 199 if( !k || (k == _sentinel) ) break; // Found a slot | |
| 200 assert( k != n, "already inserted" ); | |
| 201 // if( PrintCompilation && PrintOptoStatistics && Verbose ) { tty->print(" conflict: "); k->dump(); conflict = true; } | |
| 202 key = (key + stride) & (_max-1); // Stride through table w/ relative prime | |
| 203 } | |
| 204 _table[key] = n; // Insert into table! | |
| 205 debug_only(n->enter_hash_lock()); // Lock down the node while in the table. | |
| 206 // if( conflict ) { n->dump(); } | |
| 207 } | |
| 208 | |
| 209 //------------------------------hash_delete------------------------------------ | |
| 605 | 210 // Replace in hash table with sentinel |
| 0 | 211 bool NodeHash::hash_delete( const Node *n ) { |
| 212 Node *k; | |
| 213 uint hash = n->hash(); | |
| 214 if (hash == Node::NO_HASH) { | |
| 215 debug_only( _delete_misses++ ); | |
| 216 return false; | |
| 217 } | |
| 218 uint key = hash & (_max-1); | |
| 219 uint stride = key | 0x01; | |
| 220 debug_only( uint counter = 0; ); | |
| 605 | 221 for( ; /* (k != NULL) && (k != _sentinel) */; ) { |
| 0 | 222 debug_only( counter++ ); |
| 223 debug_only( _delete_probes++ ); | |
| 224 k = _table[key]; // Get hashed value | |
| 225 if( !k ) { // Miss? | |
| 226 debug_only( _delete_misses++ ); | |
| 227 #ifdef ASSERT | |
| 228 if( VerifyOpto ) { | |
| 229 for( uint i=0; i < _max; i++ ) | |
| 230 assert( _table[i] != n, "changed edges with rehashing" ); | |
| 231 } | |
| 232 #endif | |
| 233 return false; // Miss! Not in chain | |
| 234 } | |
| 235 else if( n == k ) { | |
| 236 debug_only( _delete_hits++ ); | |
| 237 _table[key] = _sentinel; // Hit! Label as deleted entry | |
| 238 debug_only(((Node*)n)->exit_hash_lock()); // Unlock the node upon removal from table. | |
| 239 return true; | |
| 240 } | |
| 241 else { | |
| 242 // collision: move through table with prime offset | |
| 243 key = (key + stride/*7*/) & (_max-1); | |
| 244 assert( counter <= _insert_limit, "Cycle in hash-table"); | |
| 245 } | |
| 246 } | |
| 247 ShouldNotReachHere(); | |
| 248 return false; | |
| 249 } | |
| 250 | |
| 251 //------------------------------round_up--------------------------------------- | |
| 252 // Round up to nearest power of 2 | |
| 253 uint NodeHash::round_up( uint x ) { | |
| 254 x += (x>>2); // Add 25% slop | |
| 255 if( x <16 ) return 16; // Small stuff | |
| 256 uint i=16; | |
| 257 while( i < x ) i <<= 1; // Double to fit | |
| 258 return i; // Return hash table size | |
| 259 } | |
| 260 | |
| 261 //------------------------------grow------------------------------------------- | |
| 262 // Grow _table to next power of 2 and insert old entries | |
| 263 void NodeHash::grow() { | |
| 264 // Record old state | |
| 265 uint old_max = _max; | |
| 266 Node **old_table = _table; | |
| 267 // Construct new table with twice the space | |
| 268 _grows++; | |
| 269 _total_inserts += _inserts; | |
| 270 _total_insert_probes += _insert_probes; | |
| 271 _inserts = 0; | |
| 272 _insert_probes = 0; | |
| 273 _max = _max << 1; | |
| 274 _table = NEW_ARENA_ARRAY( _a , Node* , _max ); // (Node**)_a->Amalloc( _max * sizeof(Node*) ); | |
| 275 memset(_table,0,sizeof(Node*)*_max); | |
| 276 _insert_limit = insert_limit(); | |
| 277 // Insert old entries into the new table | |
| 278 for( uint i = 0; i < old_max; i++ ) { | |
| 279 Node *m = *old_table++; | |
| 280 if( !m || m == _sentinel ) continue; | |
| 281 debug_only(m->exit_hash_lock()); // Unlock the node upon removal from old table. | |
| 282 hash_insert(m); | |
| 283 } | |
| 284 } | |
| 285 | |
| 286 //------------------------------clear------------------------------------------ | |
| 287 // Clear all entries in _table to NULL but keep storage | |
| 288 void NodeHash::clear() { | |
| 289 #ifdef ASSERT | |
| 290 // Unlock all nodes upon removal from table. | |
| 291 for (uint i = 0; i < _max; i++) { | |
| 292 Node* n = _table[i]; | |
| 293 if (!n || n == _sentinel) continue; | |
| 294 n->exit_hash_lock(); | |
| 295 } | |
| 296 #endif | |
| 297 | |
| 298 memset( _table, 0, _max * sizeof(Node*) ); | |
| 299 } | |
| 300 | |
| 301 //-----------------------remove_useless_nodes---------------------------------- | |
| 302 // Remove useless nodes from value table, | |
| 303 // implementation does not depend on hash function | |
| 304 void NodeHash::remove_useless_nodes(VectorSet &useful) { | |
| 305 | |
| 306 // Dead nodes in the hash table inherited from GVN should not replace | |
| 307 // existing nodes, remove dead nodes. | |
| 308 uint max = size(); | |
| 309 Node *sentinel_node = sentinel(); | |
| 310 for( uint i = 0; i < max; ++i ) { | |
| 311 Node *n = at(i); | |
| 312 if(n != NULL && n != sentinel_node && !useful.test(n->_idx)) { | |
| 313 debug_only(n->exit_hash_lock()); // Unlock the node when removed | |
| 314 _table[i] = sentinel_node; // Replace with placeholder | |
| 315 } | |
| 316 } | |
| 317 } | |
| 318 | |
| 319 #ifndef PRODUCT | |
| 320 //------------------------------dump------------------------------------------- | |
| 321 // Dump statistics for the hash table | |
| 322 void NodeHash::dump() { | |
| 323 _total_inserts += _inserts; | |
| 324 _total_insert_probes += _insert_probes; | |
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325 if (PrintCompilation && PrintOptoStatistics && Verbose && (_inserts > 0)) { |
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326 if (WizardMode) { |
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327 for (uint i=0; i<_max; i++) { |
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328 if (_table[i]) |
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329 tty->print("%d/%d/%d ",i,_table[i]->hash()&(_max-1),_table[i]->_idx); |
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330 } |
| 0 | 331 } |
| 332 tty->print("\nGVN Hash stats: %d grows to %d max_size\n", _grows, _max); | |
| 333 tty->print(" %d/%d (%8.1f%% full)\n", _inserts, _max, (double)_inserts/_max*100.0); | |
| 334 tty->print(" %dp/(%dh+%dm) (%8.2f probes/lookup)\n", _look_probes, _lookup_hits, _lookup_misses, (double)_look_probes/(_lookup_hits+_lookup_misses)); | |
| 335 tty->print(" %dp/%di (%8.2f probes/insert)\n", _total_insert_probes, _total_inserts, (double)_total_insert_probes/_total_inserts); | |
| 336 // sentinels increase lookup cost, but not insert cost | |
| 337 assert((_lookup_misses+_lookup_hits)*4+100 >= _look_probes, "bad hash function"); | |
| 338 assert( _inserts+(_inserts>>3) < _max, "table too full" ); | |
| 339 assert( _inserts*3+100 >= _insert_probes, "bad hash function" ); | |
| 340 } | |
| 341 } | |
| 342 | |
| 343 Node *NodeHash::find_index(uint idx) { // For debugging | |
| 344 // Find an entry by its index value | |
| 345 for( uint i = 0; i < _max; i++ ) { | |
| 346 Node *m = _table[i]; | |
| 347 if( !m || m == _sentinel ) continue; | |
| 348 if( m->_idx == (uint)idx ) return m; | |
| 349 } | |
| 350 return NULL; | |
| 351 } | |
| 352 #endif | |
| 353 | |
| 354 #ifdef ASSERT | |
| 355 NodeHash::~NodeHash() { | |
| 356 // Unlock all nodes upon destruction of table. | |
| 357 if (_table != (Node**)badAddress) clear(); | |
| 358 } | |
| 359 | |
| 360 void NodeHash::operator=(const NodeHash& nh) { | |
| 361 // Unlock all nodes upon replacement of table. | |
| 362 if (&nh == this) return; | |
| 363 if (_table != (Node**)badAddress) clear(); | |
| 364 memcpy(this, &nh, sizeof(*this)); | |
| 365 // Do not increment hash_lock counts again. | |
| 366 // Instead, be sure we never again use the source table. | |
| 367 ((NodeHash*)&nh)->_table = (Node**)badAddress; | |
| 368 } | |
| 369 | |
| 370 | |
| 371 #endif | |
| 372 | |
| 373 | |
| 374 //============================================================================= | |
| 375 //------------------------------PhaseRemoveUseless----------------------------- | |
| 376 // 1) Use a breadthfirst walk to collect useful nodes reachable from root. | |
| 377 PhaseRemoveUseless::PhaseRemoveUseless( PhaseGVN *gvn, Unique_Node_List *worklist ) : Phase(Remove_Useless), | |
| 378 _useful(Thread::current()->resource_area()) { | |
| 379 | |
| 380 // Implementation requires 'UseLoopSafepoints == true' and an edge from root | |
| 381 // to each SafePointNode at a backward branch. Inserted in add_safepoint(). | |
| 382 if( !UseLoopSafepoints || !OptoRemoveUseless ) return; | |
| 383 | |
| 384 // Identify nodes that are reachable from below, useful. | |
| 385 C->identify_useful_nodes(_useful); | |
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386 // Update dead node list |
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387 C->update_dead_node_list(_useful); |
| 0 | 388 |
| 389 // Remove all useless nodes from PhaseValues' recorded types | |
| 390 // Must be done before disconnecting nodes to preserve hash-table-invariant | |
| 391 gvn->remove_useless_nodes(_useful.member_set()); | |
| 392 | |
| 393 // Remove all useless nodes from future worklist | |
| 394 worklist->remove_useless_nodes(_useful.member_set()); | |
| 395 | |
| 396 // Disconnect 'useless' nodes that are adjacent to useful nodes | |
| 397 C->remove_useless_nodes(_useful); | |
| 398 | |
| 399 // Remove edges from "root" to each SafePoint at a backward branch. | |
| 400 // They were inserted during parsing (see add_safepoint()) to make infinite | |
| 401 // loops without calls or exceptions visible to root, i.e., useful. | |
| 402 Node *root = C->root(); | |
| 403 if( root != NULL ) { | |
| 404 for( uint i = root->req(); i < root->len(); ++i ) { | |
| 405 Node *n = root->in(i); | |
| 406 if( n != NULL && n->is_SafePoint() ) { | |
| 407 root->rm_prec(i); | |
| 408 --i; | |
| 409 } | |
| 410 } | |
| 411 } | |
| 412 } | |
| 413 | |
| 414 | |
| 415 //============================================================================= | |
| 416 //------------------------------PhaseTransform--------------------------------- | |
| 417 PhaseTransform::PhaseTransform( PhaseNumber pnum ) : Phase(pnum), | |
| 418 _arena(Thread::current()->resource_area()), | |
| 419 _nodes(_arena), | |
| 420 _types(_arena) | |
| 421 { | |
| 422 init_con_caches(); | |
| 423 #ifndef PRODUCT | |
| 424 clear_progress(); | |
| 425 clear_transforms(); | |
| 426 set_allow_progress(true); | |
| 427 #endif | |
| 428 // Force allocation for currently existing nodes | |
| 429 _types.map(C->unique(), NULL); | |
| 430 } | |
| 431 | |
| 432 //------------------------------PhaseTransform--------------------------------- | |
| 433 PhaseTransform::PhaseTransform( Arena *arena, PhaseNumber pnum ) : Phase(pnum), | |
| 434 _arena(arena), | |
| 435 _nodes(arena), | |
| 436 _types(arena) | |
| 437 { | |
| 438 init_con_caches(); | |
| 439 #ifndef PRODUCT | |
| 440 clear_progress(); | |
| 441 clear_transforms(); | |
| 442 set_allow_progress(true); | |
| 443 #endif | |
| 444 // Force allocation for currently existing nodes | |
| 445 _types.map(C->unique(), NULL); | |
| 446 } | |
| 447 | |
| 448 //------------------------------PhaseTransform--------------------------------- | |
| 449 // Initialize with previously generated type information | |
| 450 PhaseTransform::PhaseTransform( PhaseTransform *pt, PhaseNumber pnum ) : Phase(pnum), | |
| 451 _arena(pt->_arena), | |
| 452 _nodes(pt->_nodes), | |
| 453 _types(pt->_types) | |
| 454 { | |
| 455 init_con_caches(); | |
| 456 #ifndef PRODUCT | |
| 457 clear_progress(); | |
| 458 clear_transforms(); | |
| 459 set_allow_progress(true); | |
| 460 #endif | |
| 461 } | |
| 462 | |
| 463 void PhaseTransform::init_con_caches() { | |
| 464 memset(_icons,0,sizeof(_icons)); | |
| 465 memset(_lcons,0,sizeof(_lcons)); | |
| 466 memset(_zcons,0,sizeof(_zcons)); | |
| 467 } | |
| 468 | |
| 469 | |
| 470 //--------------------------------find_int_type-------------------------------- | |
| 471 const TypeInt* PhaseTransform::find_int_type(Node* n) { | |
| 472 if (n == NULL) return NULL; | |
| 473 // Call type_or_null(n) to determine node's type since we might be in | |
| 474 // parse phase and call n->Value() may return wrong type. | |
| 475 // (For example, a phi node at the beginning of loop parsing is not ready.) | |
| 476 const Type* t = type_or_null(n); | |
| 477 if (t == NULL) return NULL; | |
| 478 return t->isa_int(); | |
| 479 } | |
| 480 | |
| 481 | |
| 482 //-------------------------------find_long_type-------------------------------- | |
| 483 const TypeLong* PhaseTransform::find_long_type(Node* n) { | |
| 484 if (n == NULL) return NULL; | |
| 485 // (See comment above on type_or_null.) | |
| 486 const Type* t = type_or_null(n); | |
| 487 if (t == NULL) return NULL; | |
| 488 return t->isa_long(); | |
| 489 } | |
| 490 | |
| 491 | |
| 492 #ifndef PRODUCT | |
| 493 void PhaseTransform::dump_old2new_map() const { | |
| 494 _nodes.dump(); | |
| 495 } | |
| 496 | |
| 497 void PhaseTransform::dump_new( uint nidx ) const { | |
| 498 for( uint i=0; i<_nodes.Size(); i++ ) | |
| 499 if( _nodes[i] && _nodes[i]->_idx == nidx ) { | |
| 500 _nodes[i]->dump(); | |
| 501 tty->cr(); | |
| 502 tty->print_cr("Old index= %d",i); | |
| 503 return; | |
| 504 } | |
| 505 tty->print_cr("Node %d not found in the new indices", nidx); | |
| 506 } | |
| 507 | |
| 508 //------------------------------dump_types------------------------------------- | |
| 509 void PhaseTransform::dump_types( ) const { | |
| 510 _types.dump(); | |
| 511 } | |
| 512 | |
| 513 //------------------------------dump_nodes_and_types--------------------------- | |
| 514 void PhaseTransform::dump_nodes_and_types(const Node *root, uint depth, bool only_ctrl) { | |
| 515 VectorSet visited(Thread::current()->resource_area()); | |
| 516 dump_nodes_and_types_recur( root, depth, only_ctrl, visited ); | |
| 517 } | |
| 518 | |
| 519 //------------------------------dump_nodes_and_types_recur--------------------- | |
| 520 void PhaseTransform::dump_nodes_and_types_recur( const Node *n, uint depth, bool only_ctrl, VectorSet &visited) { | |
| 521 if( !n ) return; | |
| 522 if( depth == 0 ) return; | |
| 523 if( visited.test_set(n->_idx) ) return; | |
| 524 for( uint i=0; i<n->len(); i++ ) { | |
| 525 if( only_ctrl && !(n->is_Region()) && i != TypeFunc::Control ) continue; | |
| 526 dump_nodes_and_types_recur( n->in(i), depth-1, only_ctrl, visited ); | |
| 527 } | |
| 528 n->dump(); | |
| 529 if (type_or_null(n) != NULL) { | |
| 530 tty->print(" "); type(n)->dump(); tty->cr(); | |
| 531 } | |
| 532 } | |
| 533 | |
| 534 #endif | |
| 535 | |
| 536 | |
| 537 //============================================================================= | |
| 538 //------------------------------PhaseValues------------------------------------ | |
| 539 // Set minimum table size to "255" | |
| 540 PhaseValues::PhaseValues( Arena *arena, uint est_max_size ) : PhaseTransform(arena, GVN), _table(arena, est_max_size) { | |
| 541 NOT_PRODUCT( clear_new_values(); ) | |
| 542 } | |
| 543 | |
| 544 //------------------------------PhaseValues------------------------------------ | |
| 545 // Set minimum table size to "255" | |
| 546 PhaseValues::PhaseValues( PhaseValues *ptv ) : PhaseTransform( ptv, GVN ), | |
| 547 _table(&ptv->_table) { | |
| 548 NOT_PRODUCT( clear_new_values(); ) | |
| 549 } | |
| 550 | |
| 551 //------------------------------PhaseValues------------------------------------ | |
| 552 // Used by +VerifyOpto. Clear out hash table but copy _types array. | |
| 553 PhaseValues::PhaseValues( PhaseValues *ptv, const char *dummy ) : PhaseTransform( ptv, GVN ), | |
| 554 _table(ptv->arena(),ptv->_table.size()) { | |
| 555 NOT_PRODUCT( clear_new_values(); ) | |
| 556 } | |
| 557 | |
| 558 //------------------------------~PhaseValues----------------------------------- | |
| 559 #ifndef PRODUCT | |
| 560 PhaseValues::~PhaseValues() { | |
| 561 _table.dump(); | |
| 562 | |
| 563 // Statistics for value progress and efficiency | |
| 564 if( PrintCompilation && Verbose && WizardMode ) { | |
| 565 tty->print("\n%sValues: %d nodes ---> %d/%d (%d)", | |
| 566 is_IterGVN() ? "Iter" : " ", C->unique(), made_progress(), made_transforms(), made_new_values()); | |
| 567 if( made_transforms() != 0 ) { | |
| 568 tty->print_cr(" ratio %f", made_progress()/(float)made_transforms() ); | |
| 569 } else { | |
| 570 tty->cr(); | |
| 571 } | |
| 572 } | |
| 573 } | |
| 574 #endif | |
| 575 | |
| 576 //------------------------------makecon---------------------------------------- | |
| 577 ConNode* PhaseTransform::makecon(const Type *t) { | |
| 578 assert(t->singleton(), "must be a constant"); | |
| 579 assert(!t->empty() || t == Type::TOP, "must not be vacuous range"); | |
| 580 switch (t->base()) { // fast paths | |
| 581 case Type::Half: | |
| 582 case Type::Top: return (ConNode*) C->top(); | |
| 583 case Type::Int: return intcon( t->is_int()->get_con() ); | |
| 584 case Type::Long: return longcon( t->is_long()->get_con() ); | |
| 585 } | |
| 586 if (t->is_zero_type()) | |
| 587 return zerocon(t->basic_type()); | |
| 588 return uncached_makecon(t); | |
| 589 } | |
| 590 | |
| 591 //--------------------------uncached_makecon----------------------------------- | |
| 592 // Make an idealized constant - one of ConINode, ConPNode, etc. | |
| 593 ConNode* PhaseValues::uncached_makecon(const Type *t) { | |
| 594 assert(t->singleton(), "must be a constant"); | |
| 595 ConNode* x = ConNode::make(C, t); | |
| 596 ConNode* k = (ConNode*)hash_find_insert(x); // Value numbering | |
| 597 if (k == NULL) { | |
| 598 set_type(x, t); // Missed, provide type mapping | |
| 599 GrowableArray<Node_Notes*>* nna = C->node_note_array(); | |
| 600 if (nna != NULL) { | |
| 601 Node_Notes* loc = C->locate_node_notes(nna, x->_idx, true); | |
| 602 loc->clear(); // do not put debug info on constants | |
| 603 } | |
| 604 } else { | |
| 605 x->destruct(); // Hit, destroy duplicate constant | |
| 606 x = k; // use existing constant | |
| 607 } | |
| 608 return x; | |
| 609 } | |
| 610 | |
| 611 //------------------------------intcon----------------------------------------- | |
| 612 // Fast integer constant. Same as "transform(new ConINode(TypeInt::make(i)))" | |
| 613 ConINode* PhaseTransform::intcon(int i) { | |
| 614 // Small integer? Check cache! Check that cached node is not dead | |
| 615 if (i >= _icon_min && i <= _icon_max) { | |
| 616 ConINode* icon = _icons[i-_icon_min]; | |
| 617 if (icon != NULL && icon->in(TypeFunc::Control) != NULL) | |
| 618 return icon; | |
| 619 } | |
| 620 ConINode* icon = (ConINode*) uncached_makecon(TypeInt::make(i)); | |
| 621 assert(icon->is_Con(), ""); | |
| 622 if (i >= _icon_min && i <= _icon_max) | |
| 623 _icons[i-_icon_min] = icon; // Cache small integers | |
| 624 return icon; | |
| 625 } | |
| 626 | |
| 627 //------------------------------longcon---------------------------------------- | |
| 628 // Fast long constant. | |
| 629 ConLNode* PhaseTransform::longcon(jlong l) { | |
| 630 // Small integer? Check cache! Check that cached node is not dead | |
| 631 if (l >= _lcon_min && l <= _lcon_max) { | |
| 632 ConLNode* lcon = _lcons[l-_lcon_min]; | |
| 633 if (lcon != NULL && lcon->in(TypeFunc::Control) != NULL) | |
| 634 return lcon; | |
| 635 } | |
| 636 ConLNode* lcon = (ConLNode*) uncached_makecon(TypeLong::make(l)); | |
| 637 assert(lcon->is_Con(), ""); | |
| 638 if (l >= _lcon_min && l <= _lcon_max) | |
| 639 _lcons[l-_lcon_min] = lcon; // Cache small integers | |
| 640 return lcon; | |
| 641 } | |
| 642 | |
| 643 //------------------------------zerocon----------------------------------------- | |
| 644 // Fast zero or null constant. Same as "transform(ConNode::make(Type::get_zero_type(bt)))" | |
| 645 ConNode* PhaseTransform::zerocon(BasicType bt) { | |
| 646 assert((uint)bt <= _zcon_max, "domain check"); | |
| 647 ConNode* zcon = _zcons[bt]; | |
| 648 if (zcon != NULL && zcon->in(TypeFunc::Control) != NULL) | |
| 649 return zcon; | |
| 650 zcon = (ConNode*) uncached_makecon(Type::get_zero_type(bt)); | |
| 651 _zcons[bt] = zcon; | |
| 652 return zcon; | |
| 653 } | |
| 654 | |
| 655 | |
| 656 | |
| 657 //============================================================================= | |
| 658 //------------------------------transform-------------------------------------- | |
| 659 // Return a node which computes the same function as this node, but in a | |
|
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660 // faster or cheaper fashion. |
| 0 | 661 Node *PhaseGVN::transform( Node *n ) { |
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662 return transform_no_reclaim(n); |
| 0 | 663 } |
| 664 | |
| 665 //------------------------------transform-------------------------------------- | |
| 666 // Return a node which computes the same function as this node, but | |
| 667 // in a faster or cheaper fashion. | |
| 668 Node *PhaseGVN::transform_no_reclaim( Node *n ) { | |
| 669 NOT_PRODUCT( set_transforms(); ) | |
| 670 | |
| 671 // Apply the Ideal call in a loop until it no longer applies | |
| 672 Node *k = n; | |
| 673 NOT_PRODUCT( uint loop_count = 0; ) | |
| 674 while( 1 ) { | |
| 675 Node *i = k->Ideal(this, /*can_reshape=*/false); | |
| 676 if( !i ) break; | |
| 677 assert( i->_idx >= k->_idx, "Idealize should return new nodes, use Identity to return old nodes" ); | |
| 678 k = i; | |
| 679 assert(loop_count++ < K, "infinite loop in PhaseGVN::transform"); | |
| 680 } | |
| 681 NOT_PRODUCT( if( loop_count != 0 ) { set_progress(); } ) | |
| 682 | |
| 683 | |
| 684 // If brand new node, make space in type array. | |
| 685 ensure_type_or_null(k); | |
| 686 | |
| 687 // Since I just called 'Value' to compute the set of run-time values | |
| 688 // for this Node, and 'Value' is non-local (and therefore expensive) I'll | |
| 689 // cache Value. Later requests for the local phase->type of this Node can | |
| 690 // use the cached Value instead of suffering with 'bottom_type'. | |
| 691 const Type *t = k->Value(this); // Get runtime Value set | |
| 692 assert(t != NULL, "value sanity"); | |
| 693 if (type_or_null(k) != t) { | |
| 694 #ifndef PRODUCT | |
| 695 // Do not count initial visit to node as a transformation | |
| 696 if (type_or_null(k) == NULL) { | |
| 697 inc_new_values(); | |
| 698 set_progress(); | |
| 699 } | |
| 700 #endif | |
| 701 set_type(k, t); | |
| 702 // If k is a TypeNode, capture any more-precise type permanently into Node | |
| 703 k->raise_bottom_type(t); | |
| 704 } | |
| 705 | |
| 706 if( t->singleton() && !k->is_Con() ) { | |
| 707 NOT_PRODUCT( set_progress(); ) | |
| 708 return makecon(t); // Turn into a constant | |
| 709 } | |
| 710 | |
| 711 // Now check for Identities | |
| 712 Node *i = k->Identity(this); // Look for a nearby replacement | |
| 713 if( i != k ) { // Found? Return replacement! | |
| 714 NOT_PRODUCT( set_progress(); ) | |
| 715 return i; | |
| 716 } | |
| 717 | |
| 718 // Global Value Numbering | |
| 719 i = hash_find_insert(k); // Insert if new | |
| 720 if( i && (i != k) ) { | |
| 721 // Return the pre-existing node | |
| 722 NOT_PRODUCT( set_progress(); ) | |
| 723 return i; | |
| 724 } | |
| 725 | |
| 726 // Return Idealized original | |
| 727 return k; | |
| 728 } | |
| 729 | |
| 730 #ifdef ASSERT | |
| 731 //------------------------------dead_loop_check-------------------------------- | |
| 605 | 732 // Check for a simple dead loop when a data node references itself directly |
| 0 | 733 // or through an other data node excluding cons and phis. |
| 734 void PhaseGVN::dead_loop_check( Node *n ) { | |
| 735 // Phi may reference itself in a loop | |
| 736 if (n != NULL && !n->is_dead_loop_safe() && !n->is_CFG()) { | |
| 737 // Do 2 levels check and only data inputs. | |
| 738 bool no_dead_loop = true; | |
| 739 uint cnt = n->req(); | |
| 740 for (uint i = 1; i < cnt && no_dead_loop; i++) { | |
| 741 Node *in = n->in(i); | |
| 742 if (in == n) { | |
| 743 no_dead_loop = false; | |
| 744 } else if (in != NULL && !in->is_dead_loop_safe()) { | |
| 745 uint icnt = in->req(); | |
| 746 for (uint j = 1; j < icnt && no_dead_loop; j++) { | |
| 747 if (in->in(j) == n || in->in(j) == in) | |
| 748 no_dead_loop = false; | |
| 749 } | |
| 750 } | |
| 751 } | |
| 752 if (!no_dead_loop) n->dump(3); | |
| 753 assert(no_dead_loop, "dead loop detected"); | |
| 754 } | |
| 755 } | |
| 756 #endif | |
| 757 | |
| 758 //============================================================================= | |
| 759 //------------------------------PhaseIterGVN----------------------------------- | |
| 760 // Initialize hash table to fresh and clean for +VerifyOpto | |
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761 PhaseIterGVN::PhaseIterGVN( PhaseIterGVN *igvn, const char *dummy ) : PhaseGVN(igvn,dummy), _worklist( ), |
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762 _stack(C->unique() >> 1), |
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763 _delay_transform(false) { |
| 0 | 764 } |
| 765 | |
| 766 //------------------------------PhaseIterGVN----------------------------------- | |
| 767 // Initialize with previous PhaseIterGVN info; used by PhaseCCP | |
| 768 PhaseIterGVN::PhaseIterGVN( PhaseIterGVN *igvn ) : PhaseGVN(igvn), | |
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769 _worklist( igvn->_worklist ), |
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770 _stack( igvn->_stack ), |
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771 _delay_transform(igvn->_delay_transform) |
| 0 | 772 { |
| 773 } | |
| 774 | |
| 775 //------------------------------PhaseIterGVN----------------------------------- | |
| 776 // Initialize with previous PhaseGVN info from Parser | |
| 777 PhaseIterGVN::PhaseIterGVN( PhaseGVN *gvn ) : PhaseGVN(gvn), | |
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778 _worklist(*C->for_igvn()), |
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779 _stack(C->unique() >> 1), |
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780 _delay_transform(false) |
| 0 | 781 { |
| 782 uint max; | |
| 783 | |
| 784 // Dead nodes in the hash table inherited from GVN were not treated as | |
| 785 // roots during def-use info creation; hence they represent an invisible | |
| 786 // use. Clear them out. | |
| 787 max = _table.size(); | |
| 788 for( uint i = 0; i < max; ++i ) { | |
| 789 Node *n = _table.at(i); | |
| 790 if(n != NULL && n != _table.sentinel() && n->outcnt() == 0) { | |
| 791 if( n->is_top() ) continue; | |
| 792 assert( false, "Parse::remove_useless_nodes missed this node"); | |
| 793 hash_delete(n); | |
| 794 } | |
| 795 } | |
| 796 | |
| 797 // Any Phis or Regions on the worklist probably had uses that could not | |
| 798 // make more progress because the uses were made while the Phis and Regions | |
| 799 // were in half-built states. Put all uses of Phis and Regions on worklist. | |
| 800 max = _worklist.size(); | |
| 801 for( uint j = 0; j < max; j++ ) { | |
| 802 Node *n = _worklist.at(j); | |
| 803 uint uop = n->Opcode(); | |
| 804 if( uop == Op_Phi || uop == Op_Region || | |
| 805 n->is_Type() || | |
| 806 n->is_Mem() ) | |
| 807 add_users_to_worklist(n); | |
| 808 } | |
| 809 } | |
| 810 | |
| 811 | |
| 812 #ifndef PRODUCT | |
| 813 void PhaseIterGVN::verify_step(Node* n) { | |
| 814 _verify_window[_verify_counter % _verify_window_size] = n; | |
| 815 ++_verify_counter; | |
| 816 ResourceMark rm; | |
| 817 ResourceArea *area = Thread::current()->resource_area(); | |
| 818 VectorSet old_space(area), new_space(area); | |
| 819 if (C->unique() < 1000 || | |
| 820 0 == _verify_counter % (C->unique() < 10000 ? 10 : 100)) { | |
| 821 ++_verify_full_passes; | |
| 822 Node::verify_recur(C->root(), -1, old_space, new_space); | |
| 823 } | |
| 824 const int verify_depth = 4; | |
| 825 for ( int i = 0; i < _verify_window_size; i++ ) { | |
| 826 Node* n = _verify_window[i]; | |
| 827 if ( n == NULL ) continue; | |
| 828 if( n->in(0) == NodeSentinel ) { // xform_idom | |
| 829 _verify_window[i] = n->in(1); | |
| 830 --i; continue; | |
| 831 } | |
| 832 // Typical fanout is 1-2, so this call visits about 6 nodes. | |
| 833 Node::verify_recur(n, verify_depth, old_space, new_space); | |
| 834 } | |
| 835 } | |
| 836 #endif | |
| 837 | |
| 838 | |
| 839 //------------------------------init_worklist---------------------------------- | |
| 840 // Initialize worklist for each node. | |
| 841 void PhaseIterGVN::init_worklist( Node *n ) { | |
| 842 if( _worklist.member(n) ) return; | |
| 843 _worklist.push(n); | |
| 844 uint cnt = n->req(); | |
| 845 for( uint i =0 ; i < cnt; i++ ) { | |
| 846 Node *m = n->in(i); | |
| 847 if( m ) init_worklist(m); | |
| 848 } | |
| 849 } | |
| 850 | |
| 851 //------------------------------optimize--------------------------------------- | |
| 852 void PhaseIterGVN::optimize() { | |
| 853 debug_only(uint num_processed = 0;); | |
| 854 #ifndef PRODUCT | |
| 855 { | |
| 856 _verify_counter = 0; | |
| 857 _verify_full_passes = 0; | |
| 858 for ( int i = 0; i < _verify_window_size; i++ ) { | |
| 859 _verify_window[i] = NULL; | |
| 860 } | |
| 861 } | |
| 862 #endif | |
| 863 | |
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864 #ifdef ASSERT |
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865 Node* prev = NULL; |
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866 uint rep_cnt = 0; |
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867 #endif |
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868 uint loop_count = 0; |
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869 |
| 0 | 870 // Pull from worklist; transform node; |
| 871 // If node has changed: update edge info and put uses on worklist. | |
| 872 while( _worklist.size() ) { | |
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873 if (C->check_node_count(NodeLimitFudgeFactor * 2, |
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874 "out of nodes optimizing method")) { |
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875 return; |
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876 } |
| 0 | 877 Node *n = _worklist.pop(); |
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878 if (++loop_count >= K * C->unique()) { |
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879 debug_only(n->dump(4);) |
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880 assert(false, "infinite loop in PhaseIterGVN::optimize"); |
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881 C->record_method_not_compilable("infinite loop in PhaseIterGVN::optimize"); |
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882 return; |
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883 } |
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884 #ifdef ASSERT |
|
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885 if (n == prev) { |
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886 if (++rep_cnt > 3) { |
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887 n->dump(4); |
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888 assert(false, "loop in Ideal transformation"); |
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889 } |
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890 } else { |
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891 rep_cnt = 0; |
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892 } |
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893 prev = n; |
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894 #endif |
| 0 | 895 if (TraceIterativeGVN && Verbose) { |
| 896 tty->print(" Pop "); | |
| 897 NOT_PRODUCT( n->dump(); ) | |
| 898 debug_only(if( (num_processed++ % 100) == 0 ) _worklist.print_set();) | |
| 899 } | |
| 900 | |
| 901 if (n->outcnt() != 0) { | |
| 902 | |
| 903 #ifndef PRODUCT | |
| 904 uint wlsize = _worklist.size(); | |
| 905 const Type* oldtype = type_or_null(n); | |
| 906 #endif //PRODUCT | |
| 907 | |
| 908 Node *nn = transform_old(n); | |
| 909 | |
| 910 #ifndef PRODUCT | |
| 911 if (TraceIterativeGVN) { | |
| 912 const Type* newtype = type_or_null(n); | |
| 913 if (nn != n) { | |
| 914 // print old node | |
| 915 tty->print("< "); | |
| 916 if (oldtype != newtype && oldtype != NULL) { | |
| 917 oldtype->dump(); | |
| 918 } | |
| 919 do { tty->print("\t"); } while (tty->position() < 16); | |
| 920 tty->print("<"); | |
| 921 n->dump(); | |
| 922 } | |
| 923 if (oldtype != newtype || nn != n) { | |
| 924 // print new node and/or new type | |
| 925 if (oldtype == NULL) { | |
| 926 tty->print("* "); | |
| 927 } else if (nn != n) { | |
| 928 tty->print("> "); | |
| 929 } else { | |
| 930 tty->print("= "); | |
| 931 } | |
| 932 if (newtype == NULL) { | |
| 933 tty->print("null"); | |
| 934 } else { | |
| 935 newtype->dump(); | |
| 936 } | |
| 937 do { tty->print("\t"); } while (tty->position() < 16); | |
| 938 nn->dump(); | |
| 939 } | |
| 940 if (Verbose && wlsize < _worklist.size()) { | |
| 941 tty->print(" Push {"); | |
| 942 while (wlsize != _worklist.size()) { | |
| 943 Node* pushed = _worklist.at(wlsize++); | |
| 944 tty->print(" %d", pushed->_idx); | |
| 945 } | |
| 946 tty->print_cr(" }"); | |
| 947 } | |
| 948 } | |
| 949 if( VerifyIterativeGVN && nn != n ) { | |
| 950 verify_step((Node*) NULL); // ignore n, it might be subsumed | |
| 951 } | |
| 952 #endif | |
| 953 } else if (!n->is_top()) { | |
| 954 remove_dead_node(n); | |
| 955 } | |
| 956 } | |
| 957 | |
| 958 #ifndef PRODUCT | |
| 959 C->verify_graph_edges(); | |
| 960 if( VerifyOpto && allow_progress() ) { | |
| 961 // Must turn off allow_progress to enable assert and break recursion | |
| 962 C->root()->verify(); | |
| 963 { // Check if any progress was missed using IterGVN | |
| 964 // Def-Use info enables transformations not attempted in wash-pass | |
| 965 // e.g. Region/Phi cleanup, ... | |
| 966 // Null-check elision -- may not have reached fixpoint | |
| 967 // do not propagate to dominated nodes | |
| 968 ResourceMark rm; | |
| 969 PhaseIterGVN igvn2(this,"Verify"); // Fresh and clean! | |
| 970 // Fill worklist completely | |
| 971 igvn2.init_worklist(C->root()); | |
| 972 | |
| 973 igvn2.set_allow_progress(false); | |
| 974 igvn2.optimize(); | |
| 975 igvn2.set_allow_progress(true); | |
| 976 } | |
| 977 } | |
| 978 if ( VerifyIterativeGVN && PrintOpto ) { | |
| 979 if ( _verify_counter == _verify_full_passes ) | |
| 980 tty->print_cr("VerifyIterativeGVN: %d transforms and verify passes", | |
| 981 _verify_full_passes); | |
| 982 else | |
| 983 tty->print_cr("VerifyIterativeGVN: %d transforms, %d full verify passes", | |
| 984 _verify_counter, _verify_full_passes); | |
| 985 } | |
| 986 #endif | |
| 987 } | |
| 988 | |
| 989 | |
| 990 //------------------register_new_node_with_optimizer--------------------------- | |
| 991 // Register a new node with the optimizer. Update the types array, the def-use | |
| 992 // info. Put on worklist. | |
| 993 Node* PhaseIterGVN::register_new_node_with_optimizer(Node* n, Node* orig) { | |
| 994 set_type_bottom(n); | |
| 995 _worklist.push(n); | |
| 996 if (orig != NULL) C->copy_node_notes_to(n, orig); | |
| 997 return n; | |
| 998 } | |
| 999 | |
| 1000 //------------------------------transform-------------------------------------- | |
| 1001 // Non-recursive: idealize Node 'n' with respect to its inputs and its value | |
| 1002 Node *PhaseIterGVN::transform( Node *n ) { | |
|
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1003 if (_delay_transform) { |
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1004 // Register the node but don't optimize for now |
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1005 register_new_node_with_optimizer(n); |
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1006 return n; |
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1007 } |
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1008 |
| 0 | 1009 // If brand new node, make space in type array, and give it a type. |
| 1010 ensure_type_or_null(n); | |
| 1011 if (type_or_null(n) == NULL) { | |
| 1012 set_type_bottom(n); | |
| 1013 } | |
| 1014 | |
| 1015 return transform_old(n); | |
| 1016 } | |
| 1017 | |
| 1018 //------------------------------transform_old---------------------------------- | |
| 1019 Node *PhaseIterGVN::transform_old( Node *n ) { | |
| 1020 #ifndef PRODUCT | |
| 1021 debug_only(uint loop_count = 0;); | |
| 1022 set_transforms(); | |
| 1023 #endif | |
| 1024 // Remove 'n' from hash table in case it gets modified | |
| 1025 _table.hash_delete(n); | |
| 1026 if( VerifyIterativeGVN ) { | |
| 1027 assert( !_table.find_index(n->_idx), "found duplicate entry in table"); | |
| 1028 } | |
| 1029 | |
| 1030 // Apply the Ideal call in a loop until it no longer applies | |
| 1031 Node *k = n; | |
| 1032 DEBUG_ONLY(dead_loop_check(k);) | |
| 305 | 1033 DEBUG_ONLY(bool is_new = (k->outcnt() == 0);) |
| 0 | 1034 Node *i = k->Ideal(this, /*can_reshape=*/true); |
| 305 | 1035 assert(i != k || is_new || i->outcnt() > 0, "don't return dead nodes"); |
| 0 | 1036 #ifndef PRODUCT |
| 1037 if( VerifyIterativeGVN ) | |
| 1038 verify_step(k); | |
| 1039 if( i && VerifyOpto ) { | |
| 1040 if( !allow_progress() ) { | |
| 1041 if (i->is_Add() && i->outcnt() == 1) { | |
| 1042 // Switched input to left side because this is the only use | |
| 1043 } else if( i->is_If() && (i->in(0) == NULL) ) { | |
| 1044 // This IF is dead because it is dominated by an equivalent IF When | |
| 1045 // dominating if changed, info is not propagated sparsely to 'this' | |
| 1046 // Propagating this info further will spuriously identify other | |
| 1047 // progress. | |
| 1048 return i; | |
| 1049 } else | |
| 1050 set_progress(); | |
| 1051 } else | |
| 1052 set_progress(); | |
| 1053 } | |
| 1054 #endif | |
| 1055 | |
| 1056 while( i ) { | |
| 1057 #ifndef PRODUCT | |
| 1058 debug_only( if( loop_count >= K ) i->dump(4); ) | |
| 1059 assert(loop_count < K, "infinite loop in PhaseIterGVN::transform"); | |
| 1060 debug_only( loop_count++; ) | |
| 1061 #endif | |
| 1062 assert((i->_idx >= k->_idx) || i->is_top(), "Idealize should return new nodes, use Identity to return old nodes"); | |
| 1063 // Made a change; put users of original Node on worklist | |
| 1064 add_users_to_worklist( k ); | |
| 1065 // Replacing root of transform tree? | |
| 1066 if( k != i ) { | |
| 1067 // Make users of old Node now use new. | |
| 1068 subsume_node( k, i ); | |
| 1069 k = i; | |
| 1070 } | |
| 1071 DEBUG_ONLY(dead_loop_check(k);) | |
| 1072 // Try idealizing again | |
| 305 | 1073 DEBUG_ONLY(is_new = (k->outcnt() == 0);) |
| 0 | 1074 i = k->Ideal(this, /*can_reshape=*/true); |
| 305 | 1075 assert(i != k || is_new || i->outcnt() > 0, "don't return dead nodes"); |
| 0 | 1076 #ifndef PRODUCT |
| 1077 if( VerifyIterativeGVN ) | |
| 1078 verify_step(k); | |
| 1079 if( i && VerifyOpto ) set_progress(); | |
| 1080 #endif | |
| 1081 } | |
| 1082 | |
| 1083 // If brand new node, make space in type array. | |
| 1084 ensure_type_or_null(k); | |
| 1085 | |
| 1086 // See what kind of values 'k' takes on at runtime | |
| 1087 const Type *t = k->Value(this); | |
| 1088 assert(t != NULL, "value sanity"); | |
| 1089 | |
| 1090 // Since I just called 'Value' to compute the set of run-time values | |
| 1091 // for this Node, and 'Value' is non-local (and therefore expensive) I'll | |
| 1092 // cache Value. Later requests for the local phase->type of this Node can | |
| 1093 // use the cached Value instead of suffering with 'bottom_type'. | |
| 1094 if (t != type_or_null(k)) { | |
| 1095 NOT_PRODUCT( set_progress(); ) | |
| 1096 NOT_PRODUCT( inc_new_values();) | |
| 1097 set_type(k, t); | |
| 1098 // If k is a TypeNode, capture any more-precise type permanently into Node | |
| 1099 k->raise_bottom_type(t); | |
| 1100 // Move users of node to worklist | |
| 1101 add_users_to_worklist( k ); | |
| 1102 } | |
| 1103 | |
| 1104 // If 'k' computes a constant, replace it with a constant | |
| 1105 if( t->singleton() && !k->is_Con() ) { | |
| 1106 NOT_PRODUCT( set_progress(); ) | |
| 1107 Node *con = makecon(t); // Make a constant | |
| 1108 add_users_to_worklist( k ); | |
| 1109 subsume_node( k, con ); // Everybody using k now uses con | |
| 1110 return con; | |
| 1111 } | |
| 1112 | |
| 1113 // Now check for Identities | |
| 1114 i = k->Identity(this); // Look for a nearby replacement | |
| 1115 if( i != k ) { // Found? Return replacement! | |
| 1116 NOT_PRODUCT( set_progress(); ) | |
| 1117 add_users_to_worklist( k ); | |
| 1118 subsume_node( k, i ); // Everybody using k now uses i | |
| 1119 return i; | |
| 1120 } | |
| 1121 | |
| 1122 // Global Value Numbering | |
| 1123 i = hash_find_insert(k); // Check for pre-existing node | |
| 1124 if( i && (i != k) ) { | |
| 1125 // Return the pre-existing node if it isn't dead | |
| 1126 NOT_PRODUCT( set_progress(); ) | |
| 1127 add_users_to_worklist( k ); | |
| 1128 subsume_node( k, i ); // Everybody using k now uses i | |
| 1129 return i; | |
| 1130 } | |
| 1131 | |
| 1132 // Return Idealized original | |
| 1133 return k; | |
| 1134 } | |
| 1135 | |
| 1136 //---------------------------------saturate------------------------------------ | |
| 1137 const Type* PhaseIterGVN::saturate(const Type* new_type, const Type* old_type, | |
| 1138 const Type* limit_type) const { | |
| 1139 return new_type->narrow(old_type); | |
| 1140 } | |
| 1141 | |
| 1142 //------------------------------remove_globally_dead_node---------------------- | |
| 1143 // Kill a globally dead Node. All uses are also globally dead and are | |
| 1144 // aggressively trimmed. | |
| 1145 void PhaseIterGVN::remove_globally_dead_node( Node *dead ) { | |
|
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1146 enum DeleteProgress { |
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1147 PROCESS_INPUTS, |
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1148 PROCESS_OUTPUTS |
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1149 }; |
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1150 assert(_stack.is_empty(), "not empty"); |
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1151 _stack.push(dead, PROCESS_INPUTS); |
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1152 |
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1153 while (_stack.is_nonempty()) { |
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1154 dead = _stack.node(); |
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1155 uint progress_state = _stack.index(); |
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1156 assert(dead != C->root(), "killing root, eh?"); |
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1157 assert(!dead->is_top(), "add check for top when pushing"); |
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1158 NOT_PRODUCT( set_progress(); ) |
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1159 if (progress_state == PROCESS_INPUTS) { |
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1160 // After following inputs, continue to outputs |
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1161 _stack.set_index(PROCESS_OUTPUTS); |
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1162 // Remove from iterative worklist |
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1163 _worklist.remove(dead); |
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1164 if (!dead->is_Con()) { // Don't kill cons but uses |
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1165 bool recurse = false; |
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1166 // Remove from hash table |
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1167 _table.hash_delete( dead ); |
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1168 // Smash all inputs to 'dead', isolating him completely |
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1169 for( uint i = 0; i < dead->req(); i++ ) { |
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1170 Node *in = dead->in(i); |
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1171 if( in ) { // Points to something? |
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1172 dead->set_req(i,NULL); // Kill the edge |
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1173 if (in->outcnt() == 0 && in != C->top()) {// Made input go dead? |
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1174 _stack.push(in, PROCESS_INPUTS); // Recursively remove |
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1175 recurse = true; |
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1176 } else if (in->outcnt() == 1 && |
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1177 in->has_special_unique_user()) { |
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1178 _worklist.push(in->unique_out()); |
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1179 } else if (in->outcnt() <= 2 && dead->is_Phi()) { |
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1180 if( in->Opcode() == Op_Region ) |
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1181 _worklist.push(in); |
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1182 else if( in->is_Store() ) { |
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1183 DUIterator_Fast imax, i = in->fast_outs(imax); |
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1184 _worklist.push(in->fast_out(i)); |
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1185 i++; |
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1186 if(in->outcnt() == 2) { |
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1187 _worklist.push(in->fast_out(i)); |
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1188 i++; |
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1189 } |
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1190 assert(!(i < imax), "sanity"); |
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1191 } |
| 0 | 1192 } |
| 1193 } | |
| 1194 } | |
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1195 C->record_dead_node(dead->_idx); |
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1196 if (dead->is_macro()) { |
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1197 C->remove_macro_node(dead); |
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1198 } |
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1199 |
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1200 if (recurse) { |
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1201 continue; |
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1202 } |
| 0 | 1203 } |
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1204 // Constant node that has no out-edges and has only one in-edge from |
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1205 // root is usually dead. However, sometimes reshaping walk makes |
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1206 // it reachable by adding use edges. So, we will NOT count Con nodes |
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1207 // as dead to be conservative about the dead node count at any |
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1208 // given time. |
| 0 | 1209 } |
| 1210 | |
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1211 // Aggressively kill globally dead uses |
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1212 // (Rather than pushing all the outs at once, we push one at a time, |
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1213 // plus the parent to resume later, because of the indefinite number |
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1214 // of edge deletions per loop trip.) |
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1215 if (dead->outcnt() > 0) { |
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1216 // Recursively remove |
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1217 _stack.push(dead->raw_out(0), PROCESS_INPUTS); |
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1218 } else { |
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1219 _stack.pop(); |
| 0 | 1220 } |
| 1221 } | |
| 1222 } | |
| 1223 | |
| 1224 //------------------------------subsume_node----------------------------------- | |
| 1225 // Remove users from node 'old' and add them to node 'nn'. | |
| 1226 void PhaseIterGVN::subsume_node( Node *old, Node *nn ) { | |
| 1227 assert( old != hash_find(old), "should already been removed" ); | |
| 1228 assert( old != C->top(), "cannot subsume top node"); | |
| 1229 // Copy debug or profile information to the new version: | |
| 1230 C->copy_node_notes_to(nn, old); | |
| 1231 // Move users of node 'old' to node 'nn' | |
| 1232 for (DUIterator_Last imin, i = old->last_outs(imin); i >= imin; ) { | |
| 1233 Node* use = old->last_out(i); // for each use... | |
| 1234 // use might need re-hashing (but it won't if it's a new node) | |
| 1235 bool is_in_table = _table.hash_delete( use ); | |
| 1236 // Update use-def info as well | |
| 1237 // We remove all occurrences of old within use->in, | |
| 1238 // so as to avoid rehashing any node more than once. | |
| 1239 // The hash table probe swamps any outer loop overhead. | |
| 1240 uint num_edges = 0; | |
| 1241 for (uint jmax = use->len(), j = 0; j < jmax; j++) { | |
| 1242 if (use->in(j) == old) { | |
| 1243 use->set_req(j, nn); | |
| 1244 ++num_edges; | |
| 1245 } | |
| 1246 } | |
| 1247 // Insert into GVN hash table if unique | |
| 1248 // If a duplicate, 'use' will be cleaned up when pulled off worklist | |
| 1249 if( is_in_table ) { | |
| 1250 hash_find_insert(use); | |
| 1251 } | |
| 1252 i -= num_edges; // we deleted 1 or more copies of this edge | |
| 1253 } | |
| 1254 | |
| 1255 // Smash all inputs to 'old', isolating him completely | |
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1256 Node *temp = new (C) Node(1); |
| 0 | 1257 temp->init_req(0,nn); // Add a use to nn to prevent him from dying |
| 1258 remove_dead_node( old ); | |
| 1259 temp->del_req(0); // Yank bogus edge | |
| 1260 #ifndef PRODUCT | |
| 1261 if( VerifyIterativeGVN ) { | |
| 1262 for ( int i = 0; i < _verify_window_size; i++ ) { | |
| 1263 if ( _verify_window[i] == old ) | |
| 1264 _verify_window[i] = nn; | |
| 1265 } | |
| 1266 } | |
| 1267 #endif | |
| 1268 _worklist.remove(temp); // this can be necessary | |
| 1269 temp->destruct(); // reuse the _idx of this little guy | |
| 1270 } | |
| 1271 | |
| 1272 //------------------------------add_users_to_worklist-------------------------- | |
| 1273 void PhaseIterGVN::add_users_to_worklist0( Node *n ) { | |
| 1274 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
| 1275 _worklist.push(n->fast_out(i)); // Push on worklist | |
| 1276 } | |
| 1277 } | |
| 1278 | |
| 1279 void PhaseIterGVN::add_users_to_worklist( Node *n ) { | |
| 1280 add_users_to_worklist0(n); | |
| 1281 | |
| 1282 // Move users of node to worklist | |
| 1283 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
| 1284 Node* use = n->fast_out(i); // Get use | |
| 1285 | |
| 1286 if( use->is_Multi() || // Multi-definer? Push projs on worklist | |
| 1287 use->is_Store() ) // Enable store/load same address | |
| 1288 add_users_to_worklist0(use); | |
| 1289 | |
| 1290 // If we changed the receiver type to a call, we need to revisit | |
| 1291 // the Catch following the call. It's looking for a non-NULL | |
| 1292 // receiver to know when to enable the regular fall-through path | |
| 1293 // in addition to the NullPtrException path. | |
| 1294 if (use->is_CallDynamicJava() && n == use->in(TypeFunc::Parms)) { | |
| 1295 Node* p = use->as_CallDynamicJava()->proj_out(TypeFunc::Control); | |
| 1296 if (p != NULL) { | |
| 1297 add_users_to_worklist0(p); | |
| 1298 } | |
| 1299 } | |
| 1300 | |
| 1301 if( use->is_Cmp() ) { // Enable CMP/BOOL optimization | |
| 1302 add_users_to_worklist(use); // Put Bool on worklist | |
| 1303 // Look for the 'is_x2logic' pattern: "x ? : 0 : 1" and put the | |
| 1304 // phi merging either 0 or 1 onto the worklist | |
| 1305 if (use->outcnt() > 0) { | |
| 1306 Node* bol = use->raw_out(0); | |
| 1307 if (bol->outcnt() > 0) { | |
| 1308 Node* iff = bol->raw_out(0); | |
| 1309 if (iff->outcnt() == 2) { | |
| 1310 Node* ifproj0 = iff->raw_out(0); | |
| 1311 Node* ifproj1 = iff->raw_out(1); | |
| 1312 if (ifproj0->outcnt() > 0 && ifproj1->outcnt() > 0) { | |
| 1313 Node* region0 = ifproj0->raw_out(0); | |
| 1314 Node* region1 = ifproj1->raw_out(0); | |
| 1315 if( region0 == region1 ) | |
| 1316 add_users_to_worklist0(region0); | |
| 1317 } | |
| 1318 } | |
| 1319 } | |
| 1320 } | |
| 1321 } | |
| 1322 | |
| 1323 uint use_op = use->Opcode(); | |
| 1324 // If changed Cast input, check Phi users for simple cycles | |
| 65 | 1325 if( use->is_ConstraintCast() || use->is_CheckCastPP() ) { |
| 0 | 1326 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { |
| 1327 Node* u = use->fast_out(i2); | |
| 1328 if (u->is_Phi()) | |
| 1329 _worklist.push(u); | |
| 1330 } | |
| 1331 } | |
| 1332 // If changed LShift inputs, check RShift users for useless sign-ext | |
| 1333 if( use_op == Op_LShiftI ) { | |
| 1334 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { | |
| 1335 Node* u = use->fast_out(i2); | |
| 1336 if (u->Opcode() == Op_RShiftI) | |
| 1337 _worklist.push(u); | |
| 1338 } | |
| 1339 } | |
| 1340 // If changed AddP inputs, check Stores for loop invariant | |
| 1341 if( use_op == Op_AddP ) { | |
| 1342 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { | |
| 1343 Node* u = use->fast_out(i2); | |
| 1344 if (u->is_Mem()) | |
| 1345 _worklist.push(u); | |
| 1346 } | |
| 1347 } | |
| 1348 // If changed initialization activity, check dependent Stores | |
| 1349 if (use_op == Op_Allocate || use_op == Op_AllocateArray) { | |
| 1350 InitializeNode* init = use->as_Allocate()->initialization(); | |
| 1351 if (init != NULL) { | |
| 1352 Node* imem = init->proj_out(TypeFunc::Memory); | |
| 1353 if (imem != NULL) add_users_to_worklist0(imem); | |
| 1354 } | |
| 1355 } | |
| 1356 if (use_op == Op_Initialize) { | |
| 1357 Node* imem = use->as_Initialize()->proj_out(TypeFunc::Memory); | |
| 1358 if (imem != NULL) add_users_to_worklist0(imem); | |
| 1359 } | |
| 1360 } | |
| 1361 } | |
| 1362 | |
| 1363 //============================================================================= | |
| 1364 #ifndef PRODUCT | |
| 1365 uint PhaseCCP::_total_invokes = 0; | |
| 1366 uint PhaseCCP::_total_constants = 0; | |
| 1367 #endif | |
| 1368 //------------------------------PhaseCCP--------------------------------------- | |
| 1369 // Conditional Constant Propagation, ala Wegman & Zadeck | |
| 1370 PhaseCCP::PhaseCCP( PhaseIterGVN *igvn ) : PhaseIterGVN(igvn) { | |
| 1371 NOT_PRODUCT( clear_constants(); ) | |
| 1372 assert( _worklist.size() == 0, "" ); | |
| 1373 // Clear out _nodes from IterGVN. Must be clear to transform call. | |
| 1374 _nodes.clear(); // Clear out from IterGVN | |
| 1375 analyze(); | |
| 1376 } | |
| 1377 | |
| 1378 #ifndef PRODUCT | |
| 1379 //------------------------------~PhaseCCP-------------------------------------- | |
| 1380 PhaseCCP::~PhaseCCP() { | |
| 1381 inc_invokes(); | |
| 1382 _total_constants += count_constants(); | |
| 1383 } | |
| 1384 #endif | |
| 1385 | |
| 1386 | |
| 1387 #ifdef ASSERT | |
| 1388 static bool ccp_type_widens(const Type* t, const Type* t0) { | |
| 1389 assert(t->meet(t0) == t, "Not monotonic"); | |
| 1390 switch (t->base() == t0->base() ? t->base() : Type::Top) { | |
| 1391 case Type::Int: | |
| 1392 assert(t0->isa_int()->_widen <= t->isa_int()->_widen, "widen increases"); | |
| 1393 break; | |
| 1394 case Type::Long: | |
| 1395 assert(t0->isa_long()->_widen <= t->isa_long()->_widen, "widen increases"); | |
| 1396 break; | |
| 1397 } | |
| 1398 return true; | |
| 1399 } | |
| 1400 #endif //ASSERT | |
| 1401 | |
| 1402 //------------------------------analyze---------------------------------------- | |
| 1403 void PhaseCCP::analyze() { | |
| 1404 // Initialize all types to TOP, optimistic analysis | |
| 1405 for (int i = C->unique() - 1; i >= 0; i--) { | |
| 1406 _types.map(i,Type::TOP); | |
| 1407 } | |
| 1408 | |
| 1409 // Push root onto worklist | |
| 1410 Unique_Node_List worklist; | |
| 1411 worklist.push(C->root()); | |
| 1412 | |
| 1413 // Pull from worklist; compute new value; push changes out. | |
| 1414 // This loop is the meat of CCP. | |
| 1415 while( worklist.size() ) { | |
| 1416 Node *n = worklist.pop(); | |
| 1417 const Type *t = n->Value(this); | |
| 1418 if (t != type(n)) { | |
| 1419 assert(ccp_type_widens(t, type(n)), "ccp type must widen"); | |
| 1420 #ifndef PRODUCT | |
| 1421 if( TracePhaseCCP ) { | |
| 1422 t->dump(); | |
| 1423 do { tty->print("\t"); } while (tty->position() < 16); | |
| 1424 n->dump(); | |
| 1425 } | |
| 1426 #endif | |
| 1427 set_type(n, t); | |
| 1428 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
| 1429 Node* m = n->fast_out(i); // Get user | |
| 1430 if( m->is_Region() ) { // New path to Region? Must recheck Phis too | |
| 1431 for (DUIterator_Fast i2max, i2 = m->fast_outs(i2max); i2 < i2max; i2++) { | |
| 1432 Node* p = m->fast_out(i2); // Propagate changes to uses | |
| 1433 if( p->bottom_type() != type(p) ) // If not already bottomed out | |
| 1434 worklist.push(p); // Propagate change to user | |
| 1435 } | |
| 1436 } | |
| 605 | 1437 // If we changed the receiver type to a call, we need to revisit |
| 0 | 1438 // the Catch following the call. It's looking for a non-NULL |
| 1439 // receiver to know when to enable the regular fall-through path | |
| 1440 // in addition to the NullPtrException path | |
| 1441 if (m->is_Call()) { | |
| 1442 for (DUIterator_Fast i2max, i2 = m->fast_outs(i2max); i2 < i2max; i2++) { | |
| 1443 Node* p = m->fast_out(i2); // Propagate changes to uses | |
| 1444 if (p->is_Proj() && p->as_Proj()->_con == TypeFunc::Control && p->outcnt() == 1) | |
| 1445 worklist.push(p->unique_out()); | |
| 1446 } | |
| 1447 } | |
| 1448 if( m->bottom_type() != type(m) ) // If not already bottomed out | |
| 1449 worklist.push(m); // Propagate change to user | |
| 1450 } | |
| 1451 } | |
| 1452 } | |
| 1453 } | |
| 1454 | |
| 1455 //------------------------------do_transform----------------------------------- | |
| 1456 // Top level driver for the recursive transformer | |
| 1457 void PhaseCCP::do_transform() { | |
| 1458 // Correct leaves of new-space Nodes; they point to old-space. | |
| 1459 C->set_root( transform(C->root())->as_Root() ); | |
| 1460 assert( C->top(), "missing TOP node" ); | |
| 1461 assert( C->root(), "missing root" ); | |
| 1462 } | |
| 1463 | |
| 1464 //------------------------------transform-------------------------------------- | |
| 1465 // Given a Node in old-space, clone him into new-space. | |
| 1466 // Convert any of his old-space children into new-space children. | |
| 1467 Node *PhaseCCP::transform( Node *n ) { | |
| 1468 Node *new_node = _nodes[n->_idx]; // Check for transformed node | |
| 1469 if( new_node != NULL ) | |
| 1470 return new_node; // Been there, done that, return old answer | |
| 1471 new_node = transform_once(n); // Check for constant | |
| 1472 _nodes.map( n->_idx, new_node ); // Flag as having been cloned | |
| 1473 | |
| 1474 // Allocate stack of size _nodes.Size()/2 to avoid frequent realloc | |
| 1475 GrowableArray <Node *> trstack(C->unique() >> 1); | |
| 1476 | |
| 1477 trstack.push(new_node); // Process children of cloned node | |
| 1478 while ( trstack.is_nonempty() ) { | |
| 1479 Node *clone = trstack.pop(); | |
| 1480 uint cnt = clone->req(); | |
| 1481 for( uint i = 0; i < cnt; i++ ) { // For all inputs do | |
| 1482 Node *input = clone->in(i); | |
| 1483 if( input != NULL ) { // Ignore NULLs | |
| 1484 Node *new_input = _nodes[input->_idx]; // Check for cloned input node | |
| 1485 if( new_input == NULL ) { | |
| 1486 new_input = transform_once(input); // Check for constant | |
| 1487 _nodes.map( input->_idx, new_input );// Flag as having been cloned | |
| 1488 trstack.push(new_input); | |
| 1489 } | |
| 1490 assert( new_input == clone->in(i), "insanity check"); | |
| 1491 } | |
| 1492 } | |
| 1493 } | |
| 1494 return new_node; | |
| 1495 } | |
| 1496 | |
| 1497 | |
| 1498 //------------------------------transform_once--------------------------------- | |
| 1499 // For PhaseCCP, transformation is IDENTITY unless Node computed a constant. | |
| 1500 Node *PhaseCCP::transform_once( Node *n ) { | |
| 1501 const Type *t = type(n); | |
| 1502 // Constant? Use constant Node instead | |
| 1503 if( t->singleton() ) { | |
| 1504 Node *nn = n; // Default is to return the original constant | |
| 1505 if( t == Type::TOP ) { | |
| 1506 // cache my top node on the Compile instance | |
| 1507 if( C->cached_top_node() == NULL || C->cached_top_node()->in(0) == NULL ) { | |
| 1508 C->set_cached_top_node( ConNode::make(C, Type::TOP) ); | |
| 1509 set_type(C->top(), Type::TOP); | |
| 1510 } | |
| 1511 nn = C->top(); | |
| 1512 } | |
| 1513 if( !n->is_Con() ) { | |
| 1514 if( t != Type::TOP ) { | |
| 1515 nn = makecon(t); // ConNode::make(t); | |
| 1516 NOT_PRODUCT( inc_constants(); ) | |
| 1517 } else if( n->is_Region() ) { // Unreachable region | |
| 1518 // Note: nn == C->top() | |
| 1519 n->set_req(0, NULL); // Cut selfreference | |
| 1520 // Eagerly remove dead phis to avoid phis copies creation. | |
| 1521 for (DUIterator i = n->outs(); n->has_out(i); i++) { | |
| 1522 Node* m = n->out(i); | |
| 1523 if( m->is_Phi() ) { | |
| 1524 assert(type(m) == Type::TOP, "Unreachable region should not have live phis."); | |
|
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1525 replace_node(m, nn); |
| 0 | 1526 --i; // deleted this phi; rescan starting with next position |
| 1527 } | |
| 1528 } | |
| 1529 } | |
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1530 replace_node(n,nn); // Update DefUse edges for new constant |
| 0 | 1531 } |
| 1532 return nn; | |
| 1533 } | |
| 1534 | |
| 1535 // If x is a TypeNode, capture any more-precise type permanently into Node | |
| 1536 if (t != n->bottom_type()) { | |
| 1537 hash_delete(n); // changing bottom type may force a rehash | |
| 1538 n->raise_bottom_type(t); | |
| 1539 _worklist.push(n); // n re-enters the hash table via the worklist | |
| 1540 } | |
| 1541 | |
| 1542 // Idealize graph using DU info. Must clone() into new-space. | |
| 1543 // DU info is generally used to show profitability, progress or safety | |
| 1544 // (but generally not needed for correctness). | |
| 1545 Node *nn = n->Ideal_DU_postCCP(this); | |
| 1546 | |
| 1547 // TEMPORARY fix to ensure that 2nd GVN pass eliminates NULL checks | |
| 1548 switch( n->Opcode() ) { | |
| 1549 case Op_FastLock: // Revisit FastLocks for lock coarsening | |
| 1550 case Op_If: | |
| 1551 case Op_CountedLoopEnd: | |
| 1552 case Op_Region: | |
| 1553 case Op_Loop: | |
| 1554 case Op_CountedLoop: | |
| 1555 case Op_Conv2B: | |
| 1556 case Op_Opaque1: | |
| 1557 case Op_Opaque2: | |
| 1558 _worklist.push(n); | |
| 1559 break; | |
| 1560 default: | |
| 1561 break; | |
| 1562 } | |
| 1563 if( nn ) { | |
| 1564 _worklist.push(n); | |
| 1565 // Put users of 'n' onto worklist for second igvn transform | |
| 1566 add_users_to_worklist(n); | |
| 1567 return nn; | |
| 1568 } | |
| 1569 | |
| 1570 return n; | |
| 1571 } | |
| 1572 | |
| 1573 //---------------------------------saturate------------------------------------ | |
| 1574 const Type* PhaseCCP::saturate(const Type* new_type, const Type* old_type, | |
| 1575 const Type* limit_type) const { | |
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1576 const Type* wide_type = new_type->widen(old_type, limit_type); |
| 0 | 1577 if (wide_type != new_type) { // did we widen? |
| 1578 // If so, we may have widened beyond the limit type. Clip it back down. | |
| 1579 new_type = wide_type->filter(limit_type); | |
| 1580 } | |
| 1581 return new_type; | |
| 1582 } | |
| 1583 | |
| 1584 //------------------------------print_statistics------------------------------- | |
| 1585 #ifndef PRODUCT | |
| 1586 void PhaseCCP::print_statistics() { | |
| 1587 tty->print_cr("CCP: %d constants found: %d", _total_invokes, _total_constants); | |
| 1588 } | |
| 1589 #endif | |
| 1590 | |
| 1591 | |
| 1592 //============================================================================= | |
| 1593 #ifndef PRODUCT | |
| 1594 uint PhasePeephole::_total_peepholes = 0; | |
| 1595 #endif | |
| 1596 //------------------------------PhasePeephole---------------------------------- | |
| 1597 // Conditional Constant Propagation, ala Wegman & Zadeck | |
| 1598 PhasePeephole::PhasePeephole( PhaseRegAlloc *regalloc, PhaseCFG &cfg ) | |
| 1599 : PhaseTransform(Peephole), _regalloc(regalloc), _cfg(cfg) { | |
| 1600 NOT_PRODUCT( clear_peepholes(); ) | |
| 1601 } | |
| 1602 | |
| 1603 #ifndef PRODUCT | |
| 1604 //------------------------------~PhasePeephole--------------------------------- | |
| 1605 PhasePeephole::~PhasePeephole() { | |
| 1606 _total_peepholes += count_peepholes(); | |
| 1607 } | |
| 1608 #endif | |
| 1609 | |
| 1610 //------------------------------transform-------------------------------------- | |
| 1611 Node *PhasePeephole::transform( Node *n ) { | |
| 1612 ShouldNotCallThis(); | |
| 1613 return NULL; | |
| 1614 } | |
| 1615 | |
| 1616 //------------------------------do_transform----------------------------------- | |
| 1617 void PhasePeephole::do_transform() { | |
| 1618 bool method_name_not_printed = true; | |
| 1619 | |
| 1620 // Examine each basic block | |
| 1621 for( uint block_number = 1; block_number < _cfg._num_blocks; ++block_number ) { | |
| 1622 Block *block = _cfg._blocks[block_number]; | |
| 1623 bool block_not_printed = true; | |
| 1624 | |
| 1625 // and each instruction within a block | |
| 1626 uint end_index = block->_nodes.size(); | |
| 1627 // block->end_idx() not valid after PhaseRegAlloc | |
| 1628 for( uint instruction_index = 1; instruction_index < end_index; ++instruction_index ) { | |
| 1629 Node *n = block->_nodes.at(instruction_index); | |
| 1630 if( n->is_Mach() ) { | |
| 1631 MachNode *m = n->as_Mach(); | |
| 1632 int deleted_count = 0; | |
| 1633 // check for peephole opportunities | |
| 1634 MachNode *m2 = m->peephole( block, instruction_index, _regalloc, deleted_count, C ); | |
| 1635 if( m2 != NULL ) { | |
| 1636 #ifndef PRODUCT | |
| 1637 if( PrintOptoPeephole ) { | |
| 1638 // Print method, first time only | |
| 1639 if( C->method() && method_name_not_printed ) { | |
| 1640 C->method()->print_short_name(); tty->cr(); | |
| 1641 method_name_not_printed = false; | |
| 1642 } | |
| 1643 // Print this block | |
| 1644 if( Verbose && block_not_printed) { | |
| 1645 tty->print_cr("in block"); | |
| 1646 block->dump(); | |
| 1647 block_not_printed = false; | |
| 1648 } | |
| 1649 // Print instructions being deleted | |
| 1650 for( int i = (deleted_count - 1); i >= 0; --i ) { | |
| 1651 block->_nodes.at(instruction_index-i)->as_Mach()->format(_regalloc); tty->cr(); | |
| 1652 } | |
| 1653 tty->print_cr("replaced with"); | |
| 1654 // Print new instruction | |
| 1655 m2->format(_regalloc); | |
| 1656 tty->print("\n\n"); | |
| 1657 } | |
| 1658 #endif | |
| 1659 // Remove old nodes from basic block and update instruction_index | |
| 1660 // (old nodes still exist and may have edges pointing to them | |
| 1661 // as register allocation info is stored in the allocator using | |
| 1662 // the node index to live range mappings.) | |
| 1663 uint safe_instruction_index = (instruction_index - deleted_count); | |
| 1664 for( ; (instruction_index > safe_instruction_index); --instruction_index ) { | |
| 1665 block->_nodes.remove( instruction_index ); | |
| 1666 } | |
| 1667 // install new node after safe_instruction_index | |
| 1668 block->_nodes.insert( safe_instruction_index + 1, m2 ); | |
| 1669 end_index = block->_nodes.size() - 1; // Recompute new block size | |
| 1670 NOT_PRODUCT( inc_peepholes(); ) | |
| 1671 } | |
| 1672 } | |
| 1673 } | |
| 1674 } | |
| 1675 } | |
| 1676 | |
| 1677 //------------------------------print_statistics------------------------------- | |
| 1678 #ifndef PRODUCT | |
| 1679 void PhasePeephole::print_statistics() { | |
| 1680 tty->print_cr("Peephole: peephole rules applied: %d", _total_peepholes); | |
| 1681 } | |
| 1682 #endif | |
| 1683 | |
| 1684 | |
| 1685 //============================================================================= | |
| 1686 //------------------------------set_req_X-------------------------------------- | |
| 1687 void Node::set_req_X( uint i, Node *n, PhaseIterGVN *igvn ) { | |
| 1688 assert( is_not_dead(n), "can not use dead node"); | |
| 1689 assert( igvn->hash_find(this) != this, "Need to remove from hash before changing edges" ); | |
| 1690 Node *old = in(i); | |
| 1691 set_req(i, n); | |
| 1692 | |
| 1693 // old goes dead? | |
| 1694 if( old ) { | |
| 1695 switch (old->outcnt()) { | |
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1696 case 0: |
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1697 // Put into the worklist to kill later. We do not kill it now because the |
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1698 // recursive kill will delete the current node (this) if dead-loop exists |
| 0 | 1699 if (!old->is_top()) |
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1700 igvn->_worklist.push( old ); |
| 0 | 1701 break; |
| 1702 case 1: | |
| 1703 if( old->is_Store() || old->has_special_unique_user() ) | |
| 1704 igvn->add_users_to_worklist( old ); | |
| 1705 break; | |
| 1706 case 2: | |
| 1707 if( old->is_Store() ) | |
| 1708 igvn->add_users_to_worklist( old ); | |
| 1709 if( old->Opcode() == Op_Region ) | |
| 1710 igvn->_worklist.push(old); | |
| 1711 break; | |
| 1712 case 3: | |
| 1713 if( old->Opcode() == Op_Region ) { | |
| 1714 igvn->_worklist.push(old); | |
| 1715 igvn->add_users_to_worklist( old ); | |
| 1716 } | |
| 1717 break; | |
| 1718 default: | |
| 1719 break; | |
| 1720 } | |
| 1721 } | |
| 1722 | |
| 1723 } | |
| 1724 | |
| 1725 //-------------------------------replace_by----------------------------------- | |
| 1726 // Using def-use info, replace one node for another. Follow the def-use info | |
| 1727 // to all users of the OLD node. Then make all uses point to the NEW node. | |
| 1728 void Node::replace_by(Node *new_node) { | |
| 1729 assert(!is_top(), "top node has no DU info"); | |
| 1730 for (DUIterator_Last imin, i = last_outs(imin); i >= imin; ) { | |
| 1731 Node* use = last_out(i); | |
| 1732 uint uses_found = 0; | |
| 1733 for (uint j = 0; j < use->len(); j++) { | |
| 1734 if (use->in(j) == this) { | |
| 1735 if (j < use->req()) | |
| 1736 use->set_req(j, new_node); | |
| 1737 else use->set_prec(j, new_node); | |
| 1738 uses_found++; | |
| 1739 } | |
| 1740 } | |
| 1741 i -= uses_found; // we deleted 1 or more copies of this edge | |
| 1742 } | |
| 1743 } | |
| 1744 | |
| 1745 //============================================================================= | |
| 1746 //----------------------------------------------------------------------------- | |
| 1747 void Type_Array::grow( uint i ) { | |
| 1748 if( !_max ) { | |
| 1749 _max = 1; | |
| 1750 _types = (const Type**)_a->Amalloc( _max * sizeof(Type*) ); | |
| 1751 _types[0] = NULL; | |
| 1752 } | |
| 1753 uint old = _max; | |
| 1754 while( i >= _max ) _max <<= 1; // Double to fit | |
| 1755 _types = (const Type**)_a->Arealloc( _types, old*sizeof(Type*),_max*sizeof(Type*)); | |
| 1756 memset( &_types[old], 0, (_max-old)*sizeof(Type*) ); | |
| 1757 } | |
| 1758 | |
| 1759 //------------------------------dump------------------------------------------- | |
| 1760 #ifndef PRODUCT | |
| 1761 void Type_Array::dump() const { | |
| 1762 uint max = Size(); | |
| 1763 for( uint i = 0; i < max; i++ ) { | |
| 1764 if( _types[i] != NULL ) { | |
| 1765 tty->print(" %d\t== ", i); _types[i]->dump(); tty->cr(); | |
| 1766 } | |
| 1767 } | |
| 1768 } | |
| 1769 #endif |