Mercurial > hg > truffle
annotate src/share/vm/opto/phaseX.cpp @ 7447:1de1b145f6bc
8005486: NPG: Incorrect assertion in ChunkManager::list_index()
Reviewed-by: coleenp
author | jmasa |
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date | Wed, 26 Dec 2012 15:05:30 -0800 |
parents | 2aff40cb4703 |
children | d092d1b31229 |
rev | line source |
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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 ) { | |
113
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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 |