Mercurial > hg > truffle
annotate src/share/vm/opto/phaseX.cpp @ 18136:52b8826ef035
Backout wrong change in 2a69cbe850a8
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Tue, 21 Oct 2014 10:20:33 +0200 |
parents | 52b4284cb496 |
children | 7848fc12602b |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 | |
7473 | 78 void NodeHash::replace_with(NodeHash *nh) { |
79 debug_only(_table = (Node**)badAddress); // interact correctly w/ operator= | |
80 // just copy in all the fields | |
81 *this = *nh; | |
82 // nh->_sentinel must be in the current node space | |
83 } | |
84 | |
0 | 85 //------------------------------hash_find-------------------------------------- |
86 // Find in hash table | |
87 Node *NodeHash::hash_find( const Node *n ) { | |
88 // ((Node*)n)->set_hash( n->hash() ); | |
89 uint hash = n->hash(); | |
90 if (hash == Node::NO_HASH) { | |
91 debug_only( _lookup_misses++ ); | |
92 return NULL; | |
93 } | |
94 uint key = hash & (_max-1); | |
95 uint stride = key | 0x01; | |
96 debug_only( _look_probes++ ); | |
97 Node *k = _table[key]; // Get hashed value | |
98 if( !k ) { // ?Miss? | |
99 debug_only( _lookup_misses++ ); | |
100 return NULL; // Miss! | |
101 } | |
102 | |
103 int op = n->Opcode(); | |
104 uint req = n->req(); | |
105 while( 1 ) { // While probing hash table | |
106 if( k->req() == req && // Same count of inputs | |
107 k->Opcode() == op ) { // Same Opcode | |
108 for( uint i=0; i<req; i++ ) | |
109 if( n->in(i)!=k->in(i)) // Different inputs? | |
110 goto collision; // "goto" is a speed hack... | |
111 if( n->cmp(*k) ) { // Check for any special bits | |
112 debug_only( _lookup_hits++ ); | |
113 return k; // Hit! | |
114 } | |
115 } | |
116 collision: | |
117 debug_only( _look_probes++ ); | |
118 key = (key + stride/*7*/) & (_max-1); // Stride through table with relative prime | |
119 k = _table[key]; // Get hashed value | |
120 if( !k ) { // ?Miss? | |
121 debug_only( _lookup_misses++ ); | |
122 return NULL; // Miss! | |
123 } | |
124 } | |
125 ShouldNotReachHere(); | |
126 return NULL; | |
127 } | |
128 | |
129 //------------------------------hash_find_insert------------------------------- | |
130 // Find in hash table, insert if not already present | |
131 // Used to preserve unique entries in hash table | |
132 Node *NodeHash::hash_find_insert( Node *n ) { | |
133 // n->set_hash( ); | |
134 uint hash = n->hash(); | |
135 if (hash == Node::NO_HASH) { | |
136 debug_only( _lookup_misses++ ); | |
137 return NULL; | |
138 } | |
139 uint key = hash & (_max-1); | |
140 uint stride = key | 0x01; // stride must be relatively prime to table siz | |
141 uint first_sentinel = 0; // replace a sentinel if seen. | |
142 debug_only( _look_probes++ ); | |
143 Node *k = _table[key]; // Get hashed value | |
144 if( !k ) { // ?Miss? | |
145 debug_only( _lookup_misses++ ); | |
146 _table[key] = n; // Insert into table! | |
147 debug_only(n->enter_hash_lock()); // Lock down the node while in the table. | |
148 check_grow(); // Grow table if insert hit limit | |
149 return NULL; // Miss! | |
150 } | |
151 else if( k == _sentinel ) { | |
152 first_sentinel = key; // Can insert here | |
153 } | |
154 | |
155 int op = n->Opcode(); | |
156 uint req = n->req(); | |
157 while( 1 ) { // While probing hash table | |
158 if( k->req() == req && // Same count of inputs | |
159 k->Opcode() == op ) { // Same Opcode | |
160 for( uint i=0; i<req; i++ ) | |
161 if( n->in(i)!=k->in(i)) // Different inputs? | |
162 goto collision; // "goto" is a speed hack... | |
163 if( n->cmp(*k) ) { // Check for any special bits | |
164 debug_only( _lookup_hits++ ); | |
165 return k; // Hit! | |
166 } | |
167 } | |
168 collision: | |
169 debug_only( _look_probes++ ); | |
170 key = (key + stride) & (_max-1); // Stride through table w/ relative prime | |
171 k = _table[key]; // Get hashed value | |
172 if( !k ) { // ?Miss? | |
173 debug_only( _lookup_misses++ ); | |
174 key = (first_sentinel == 0) ? key : first_sentinel; // ?saw sentinel? | |
175 _table[key] = n; // Insert into table! | |
176 debug_only(n->enter_hash_lock()); // Lock down the node while in the table. | |
177 check_grow(); // Grow table if insert hit limit | |
178 return NULL; // Miss! | |
179 } | |
180 else if( first_sentinel == 0 && k == _sentinel ) { | |
181 first_sentinel = key; // Can insert here | |
182 } | |
183 | |
184 } | |
185 ShouldNotReachHere(); | |
186 return NULL; | |
187 } | |
188 | |
189 //------------------------------hash_insert------------------------------------ | |
190 // Insert into hash table | |
191 void NodeHash::hash_insert( Node *n ) { | |
192 // // "conflict" comments -- print nodes that conflict | |
193 // bool conflict = false; | |
194 // n->set_hash(); | |
195 uint hash = n->hash(); | |
196 if (hash == Node::NO_HASH) { | |
197 return; | |
198 } | |
199 check_grow(); | |
200 uint key = hash & (_max-1); | |
201 uint stride = key | 0x01; | |
202 | |
203 while( 1 ) { // While probing hash table | |
204 debug_only( _insert_probes++ ); | |
205 Node *k = _table[key]; // Get hashed value | |
206 if( !k || (k == _sentinel) ) break; // Found a slot | |
207 assert( k != n, "already inserted" ); | |
208 // if( PrintCompilation && PrintOptoStatistics && Verbose ) { tty->print(" conflict: "); k->dump(); conflict = true; } | |
209 key = (key + stride) & (_max-1); // Stride through table w/ relative prime | |
210 } | |
211 _table[key] = n; // Insert into table! | |
212 debug_only(n->enter_hash_lock()); // Lock down the node while in the table. | |
213 // if( conflict ) { n->dump(); } | |
214 } | |
215 | |
216 //------------------------------hash_delete------------------------------------ | |
605 | 217 // Replace in hash table with sentinel |
0 | 218 bool NodeHash::hash_delete( const Node *n ) { |
219 Node *k; | |
220 uint hash = n->hash(); | |
221 if (hash == Node::NO_HASH) { | |
222 debug_only( _delete_misses++ ); | |
223 return false; | |
224 } | |
225 uint key = hash & (_max-1); | |
226 uint stride = key | 0x01; | |
227 debug_only( uint counter = 0; ); | |
605 | 228 for( ; /* (k != NULL) && (k != _sentinel) */; ) { |
0 | 229 debug_only( counter++ ); |
230 debug_only( _delete_probes++ ); | |
231 k = _table[key]; // Get hashed value | |
232 if( !k ) { // Miss? | |
233 debug_only( _delete_misses++ ); | |
234 #ifdef ASSERT | |
235 if( VerifyOpto ) { | |
236 for( uint i=0; i < _max; i++ ) | |
237 assert( _table[i] != n, "changed edges with rehashing" ); | |
238 } | |
239 #endif | |
240 return false; // Miss! Not in chain | |
241 } | |
242 else if( n == k ) { | |
243 debug_only( _delete_hits++ ); | |
244 _table[key] = _sentinel; // Hit! Label as deleted entry | |
245 debug_only(((Node*)n)->exit_hash_lock()); // Unlock the node upon removal from table. | |
246 return true; | |
247 } | |
248 else { | |
249 // collision: move through table with prime offset | |
250 key = (key + stride/*7*/) & (_max-1); | |
251 assert( counter <= _insert_limit, "Cycle in hash-table"); | |
252 } | |
253 } | |
254 ShouldNotReachHere(); | |
255 return false; | |
256 } | |
257 | |
258 //------------------------------round_up--------------------------------------- | |
259 // Round up to nearest power of 2 | |
260 uint NodeHash::round_up( uint x ) { | |
261 x += (x>>2); // Add 25% slop | |
262 if( x <16 ) return 16; // Small stuff | |
263 uint i=16; | |
264 while( i < x ) i <<= 1; // Double to fit | |
265 return i; // Return hash table size | |
266 } | |
267 | |
268 //------------------------------grow------------------------------------------- | |
269 // Grow _table to next power of 2 and insert old entries | |
270 void NodeHash::grow() { | |
271 // Record old state | |
272 uint old_max = _max; | |
273 Node **old_table = _table; | |
274 // Construct new table with twice the space | |
275 _grows++; | |
276 _total_inserts += _inserts; | |
277 _total_insert_probes += _insert_probes; | |
278 _inserts = 0; | |
279 _insert_probes = 0; | |
280 _max = _max << 1; | |
281 _table = NEW_ARENA_ARRAY( _a , Node* , _max ); // (Node**)_a->Amalloc( _max * sizeof(Node*) ); | |
282 memset(_table,0,sizeof(Node*)*_max); | |
283 _insert_limit = insert_limit(); | |
284 // Insert old entries into the new table | |
285 for( uint i = 0; i < old_max; i++ ) { | |
286 Node *m = *old_table++; | |
287 if( !m || m == _sentinel ) continue; | |
288 debug_only(m->exit_hash_lock()); // Unlock the node upon removal from old table. | |
289 hash_insert(m); | |
290 } | |
291 } | |
292 | |
293 //------------------------------clear------------------------------------------ | |
294 // Clear all entries in _table to NULL but keep storage | |
295 void NodeHash::clear() { | |
296 #ifdef ASSERT | |
297 // Unlock all nodes upon removal from table. | |
298 for (uint i = 0; i < _max; i++) { | |
299 Node* n = _table[i]; | |
300 if (!n || n == _sentinel) continue; | |
301 n->exit_hash_lock(); | |
302 } | |
303 #endif | |
304 | |
305 memset( _table, 0, _max * sizeof(Node*) ); | |
306 } | |
307 | |
308 //-----------------------remove_useless_nodes---------------------------------- | |
309 // Remove useless nodes from value table, | |
310 // implementation does not depend on hash function | |
311 void NodeHash::remove_useless_nodes(VectorSet &useful) { | |
312 | |
313 // Dead nodes in the hash table inherited from GVN should not replace | |
314 // existing nodes, remove dead nodes. | |
315 uint max = size(); | |
316 Node *sentinel_node = sentinel(); | |
317 for( uint i = 0; i < max; ++i ) { | |
318 Node *n = at(i); | |
319 if(n != NULL && n != sentinel_node && !useful.test(n->_idx)) { | |
320 debug_only(n->exit_hash_lock()); // Unlock the node when removed | |
321 _table[i] = sentinel_node; // Replace with placeholder | |
322 } | |
323 } | |
324 } | |
325 | |
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326 |
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327 void NodeHash::check_no_speculative_types() { |
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328 #ifdef ASSERT |
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329 uint max = size(); |
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330 Node *sentinel_node = sentinel(); |
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331 for (uint i = 0; i < max; ++i) { |
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332 Node *n = at(i); |
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333 if(n != NULL && n != sentinel_node && n->is_Type()) { |
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334 TypeNode* tn = n->as_Type(); |
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335 const Type* t = tn->type(); |
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336 const Type* t_no_spec = t->remove_speculative(); |
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337 assert(t == t_no_spec, "dead node in hash table or missed node during speculative cleanup"); |
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338 } |
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339 } |
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340 #endif |
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341 } |
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342 |
0 | 343 #ifndef PRODUCT |
344 //------------------------------dump------------------------------------------- | |
345 // Dump statistics for the hash table | |
346 void NodeHash::dump() { | |
347 _total_inserts += _inserts; | |
348 _total_insert_probes += _insert_probes; | |
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349 if (PrintCompilation && PrintOptoStatistics && Verbose && (_inserts > 0)) { |
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350 if (WizardMode) { |
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351 for (uint i=0; i<_max; i++) { |
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352 if (_table[i]) |
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353 tty->print("%d/%d/%d ",i,_table[i]->hash()&(_max-1),_table[i]->_idx); |
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354 } |
0 | 355 } |
356 tty->print("\nGVN Hash stats: %d grows to %d max_size\n", _grows, _max); | |
357 tty->print(" %d/%d (%8.1f%% full)\n", _inserts, _max, (double)_inserts/_max*100.0); | |
358 tty->print(" %dp/(%dh+%dm) (%8.2f probes/lookup)\n", _look_probes, _lookup_hits, _lookup_misses, (double)_look_probes/(_lookup_hits+_lookup_misses)); | |
359 tty->print(" %dp/%di (%8.2f probes/insert)\n", _total_insert_probes, _total_inserts, (double)_total_insert_probes/_total_inserts); | |
360 // sentinels increase lookup cost, but not insert cost | |
361 assert((_lookup_misses+_lookup_hits)*4+100 >= _look_probes, "bad hash function"); | |
362 assert( _inserts+(_inserts>>3) < _max, "table too full" ); | |
363 assert( _inserts*3+100 >= _insert_probes, "bad hash function" ); | |
364 } | |
365 } | |
366 | |
367 Node *NodeHash::find_index(uint idx) { // For debugging | |
368 // Find an entry by its index value | |
369 for( uint i = 0; i < _max; i++ ) { | |
370 Node *m = _table[i]; | |
371 if( !m || m == _sentinel ) continue; | |
372 if( m->_idx == (uint)idx ) return m; | |
373 } | |
374 return NULL; | |
375 } | |
376 #endif | |
377 | |
378 #ifdef ASSERT | |
379 NodeHash::~NodeHash() { | |
380 // Unlock all nodes upon destruction of table. | |
381 if (_table != (Node**)badAddress) clear(); | |
382 } | |
383 | |
384 void NodeHash::operator=(const NodeHash& nh) { | |
385 // Unlock all nodes upon replacement of table. | |
386 if (&nh == this) return; | |
387 if (_table != (Node**)badAddress) clear(); | |
388 memcpy(this, &nh, sizeof(*this)); | |
389 // Do not increment hash_lock counts again. | |
390 // Instead, be sure we never again use the source table. | |
391 ((NodeHash*)&nh)->_table = (Node**)badAddress; | |
392 } | |
393 | |
394 | |
395 #endif | |
396 | |
397 | |
398 //============================================================================= | |
399 //------------------------------PhaseRemoveUseless----------------------------- | |
400 // 1) Use a breadthfirst walk to collect useful nodes reachable from root. | |
401 PhaseRemoveUseless::PhaseRemoveUseless( PhaseGVN *gvn, Unique_Node_List *worklist ) : Phase(Remove_Useless), | |
402 _useful(Thread::current()->resource_area()) { | |
403 | |
404 // Implementation requires 'UseLoopSafepoints == true' and an edge from root | |
405 // to each SafePointNode at a backward branch. Inserted in add_safepoint(). | |
406 if( !UseLoopSafepoints || !OptoRemoveUseless ) return; | |
407 | |
408 // Identify nodes that are reachable from below, useful. | |
409 C->identify_useful_nodes(_useful); | |
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410 // Update dead node list |
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411 C->update_dead_node_list(_useful); |
0 | 412 |
413 // Remove all useless nodes from PhaseValues' recorded types | |
414 // Must be done before disconnecting nodes to preserve hash-table-invariant | |
415 gvn->remove_useless_nodes(_useful.member_set()); | |
416 | |
417 // Remove all useless nodes from future worklist | |
418 worklist->remove_useless_nodes(_useful.member_set()); | |
419 | |
420 // Disconnect 'useless' nodes that are adjacent to useful nodes | |
421 C->remove_useless_nodes(_useful); | |
422 | |
423 // Remove edges from "root" to each SafePoint at a backward branch. | |
424 // They were inserted during parsing (see add_safepoint()) to make infinite | |
425 // loops without calls or exceptions visible to root, i.e., useful. | |
426 Node *root = C->root(); | |
427 if( root != NULL ) { | |
428 for( uint i = root->req(); i < root->len(); ++i ) { | |
429 Node *n = root->in(i); | |
430 if( n != NULL && n->is_SafePoint() ) { | |
431 root->rm_prec(i); | |
432 --i; | |
433 } | |
434 } | |
435 } | |
436 } | |
437 | |
438 | |
439 //============================================================================= | |
440 //------------------------------PhaseTransform--------------------------------- | |
441 PhaseTransform::PhaseTransform( PhaseNumber pnum ) : Phase(pnum), | |
442 _arena(Thread::current()->resource_area()), | |
443 _nodes(_arena), | |
444 _types(_arena) | |
445 { | |
446 init_con_caches(); | |
447 #ifndef PRODUCT | |
448 clear_progress(); | |
449 clear_transforms(); | |
450 set_allow_progress(true); | |
451 #endif | |
452 // Force allocation for currently existing nodes | |
453 _types.map(C->unique(), NULL); | |
454 } | |
455 | |
456 //------------------------------PhaseTransform--------------------------------- | |
457 PhaseTransform::PhaseTransform( Arena *arena, PhaseNumber pnum ) : Phase(pnum), | |
458 _arena(arena), | |
459 _nodes(arena), | |
460 _types(arena) | |
461 { | |
462 init_con_caches(); | |
463 #ifndef PRODUCT | |
464 clear_progress(); | |
465 clear_transforms(); | |
466 set_allow_progress(true); | |
467 #endif | |
468 // Force allocation for currently existing nodes | |
469 _types.map(C->unique(), NULL); | |
470 } | |
471 | |
472 //------------------------------PhaseTransform--------------------------------- | |
473 // Initialize with previously generated type information | |
474 PhaseTransform::PhaseTransform( PhaseTransform *pt, PhaseNumber pnum ) : Phase(pnum), | |
475 _arena(pt->_arena), | |
476 _nodes(pt->_nodes), | |
477 _types(pt->_types) | |
478 { | |
479 init_con_caches(); | |
480 #ifndef PRODUCT | |
481 clear_progress(); | |
482 clear_transforms(); | |
483 set_allow_progress(true); | |
484 #endif | |
485 } | |
486 | |
487 void PhaseTransform::init_con_caches() { | |
488 memset(_icons,0,sizeof(_icons)); | |
489 memset(_lcons,0,sizeof(_lcons)); | |
490 memset(_zcons,0,sizeof(_zcons)); | |
491 } | |
492 | |
493 | |
494 //--------------------------------find_int_type-------------------------------- | |
495 const TypeInt* PhaseTransform::find_int_type(Node* n) { | |
496 if (n == NULL) return NULL; | |
497 // Call type_or_null(n) to determine node's type since we might be in | |
498 // parse phase and call n->Value() may return wrong type. | |
499 // (For example, a phi node at the beginning of loop parsing is not ready.) | |
500 const Type* t = type_or_null(n); | |
501 if (t == NULL) return NULL; | |
502 return t->isa_int(); | |
503 } | |
504 | |
505 | |
506 //-------------------------------find_long_type-------------------------------- | |
507 const TypeLong* PhaseTransform::find_long_type(Node* n) { | |
508 if (n == NULL) return NULL; | |
509 // (See comment above on type_or_null.) | |
510 const Type* t = type_or_null(n); | |
511 if (t == NULL) return NULL; | |
512 return t->isa_long(); | |
513 } | |
514 | |
515 | |
516 #ifndef PRODUCT | |
517 void PhaseTransform::dump_old2new_map() const { | |
518 _nodes.dump(); | |
519 } | |
520 | |
521 void PhaseTransform::dump_new( uint nidx ) const { | |
522 for( uint i=0; i<_nodes.Size(); i++ ) | |
523 if( _nodes[i] && _nodes[i]->_idx == nidx ) { | |
524 _nodes[i]->dump(); | |
525 tty->cr(); | |
526 tty->print_cr("Old index= %d",i); | |
527 return; | |
528 } | |
529 tty->print_cr("Node %d not found in the new indices", nidx); | |
530 } | |
531 | |
532 //------------------------------dump_types------------------------------------- | |
533 void PhaseTransform::dump_types( ) const { | |
534 _types.dump(); | |
535 } | |
536 | |
537 //------------------------------dump_nodes_and_types--------------------------- | |
538 void PhaseTransform::dump_nodes_and_types(const Node *root, uint depth, bool only_ctrl) { | |
539 VectorSet visited(Thread::current()->resource_area()); | |
540 dump_nodes_and_types_recur( root, depth, only_ctrl, visited ); | |
541 } | |
542 | |
543 //------------------------------dump_nodes_and_types_recur--------------------- | |
544 void PhaseTransform::dump_nodes_and_types_recur( const Node *n, uint depth, bool only_ctrl, VectorSet &visited) { | |
545 if( !n ) return; | |
546 if( depth == 0 ) return; | |
547 if( visited.test_set(n->_idx) ) return; | |
548 for( uint i=0; i<n->len(); i++ ) { | |
549 if( only_ctrl && !(n->is_Region()) && i != TypeFunc::Control ) continue; | |
550 dump_nodes_and_types_recur( n->in(i), depth-1, only_ctrl, visited ); | |
551 } | |
552 n->dump(); | |
553 if (type_or_null(n) != NULL) { | |
554 tty->print(" "); type(n)->dump(); tty->cr(); | |
555 } | |
556 } | |
557 | |
558 #endif | |
559 | |
560 | |
561 //============================================================================= | |
562 //------------------------------PhaseValues------------------------------------ | |
563 // Set minimum table size to "255" | |
564 PhaseValues::PhaseValues( Arena *arena, uint est_max_size ) : PhaseTransform(arena, GVN), _table(arena, est_max_size) { | |
565 NOT_PRODUCT( clear_new_values(); ) | |
566 } | |
567 | |
568 //------------------------------PhaseValues------------------------------------ | |
569 // Set minimum table size to "255" | |
570 PhaseValues::PhaseValues( PhaseValues *ptv ) : PhaseTransform( ptv, GVN ), | |
571 _table(&ptv->_table) { | |
572 NOT_PRODUCT( clear_new_values(); ) | |
573 } | |
574 | |
575 //------------------------------PhaseValues------------------------------------ | |
576 // Used by +VerifyOpto. Clear out hash table but copy _types array. | |
577 PhaseValues::PhaseValues( PhaseValues *ptv, const char *dummy ) : PhaseTransform( ptv, GVN ), | |
578 _table(ptv->arena(),ptv->_table.size()) { | |
579 NOT_PRODUCT( clear_new_values(); ) | |
580 } | |
581 | |
582 //------------------------------~PhaseValues----------------------------------- | |
583 #ifndef PRODUCT | |
584 PhaseValues::~PhaseValues() { | |
585 _table.dump(); | |
586 | |
587 // Statistics for value progress and efficiency | |
588 if( PrintCompilation && Verbose && WizardMode ) { | |
589 tty->print("\n%sValues: %d nodes ---> %d/%d (%d)", | |
590 is_IterGVN() ? "Iter" : " ", C->unique(), made_progress(), made_transforms(), made_new_values()); | |
591 if( made_transforms() != 0 ) { | |
592 tty->print_cr(" ratio %f", made_progress()/(float)made_transforms() ); | |
593 } else { | |
594 tty->cr(); | |
595 } | |
596 } | |
597 } | |
598 #endif | |
599 | |
600 //------------------------------makecon---------------------------------------- | |
601 ConNode* PhaseTransform::makecon(const Type *t) { | |
602 assert(t->singleton(), "must be a constant"); | |
603 assert(!t->empty() || t == Type::TOP, "must not be vacuous range"); | |
604 switch (t->base()) { // fast paths | |
605 case Type::Half: | |
606 case Type::Top: return (ConNode*) C->top(); | |
607 case Type::Int: return intcon( t->is_int()->get_con() ); | |
608 case Type::Long: return longcon( t->is_long()->get_con() ); | |
609 } | |
610 if (t->is_zero_type()) | |
611 return zerocon(t->basic_type()); | |
612 return uncached_makecon(t); | |
613 } | |
614 | |
615 //--------------------------uncached_makecon----------------------------------- | |
616 // Make an idealized constant - one of ConINode, ConPNode, etc. | |
617 ConNode* PhaseValues::uncached_makecon(const Type *t) { | |
618 assert(t->singleton(), "must be a constant"); | |
619 ConNode* x = ConNode::make(C, t); | |
620 ConNode* k = (ConNode*)hash_find_insert(x); // Value numbering | |
621 if (k == NULL) { | |
622 set_type(x, t); // Missed, provide type mapping | |
623 GrowableArray<Node_Notes*>* nna = C->node_note_array(); | |
624 if (nna != NULL) { | |
625 Node_Notes* loc = C->locate_node_notes(nna, x->_idx, true); | |
626 loc->clear(); // do not put debug info on constants | |
627 } | |
628 } else { | |
629 x->destruct(); // Hit, destroy duplicate constant | |
630 x = k; // use existing constant | |
631 } | |
632 return x; | |
633 } | |
634 | |
635 //------------------------------intcon----------------------------------------- | |
636 // Fast integer constant. Same as "transform(new ConINode(TypeInt::make(i)))" | |
637 ConINode* PhaseTransform::intcon(int i) { | |
638 // Small integer? Check cache! Check that cached node is not dead | |
639 if (i >= _icon_min && i <= _icon_max) { | |
640 ConINode* icon = _icons[i-_icon_min]; | |
641 if (icon != NULL && icon->in(TypeFunc::Control) != NULL) | |
642 return icon; | |
643 } | |
644 ConINode* icon = (ConINode*) uncached_makecon(TypeInt::make(i)); | |
645 assert(icon->is_Con(), ""); | |
646 if (i >= _icon_min && i <= _icon_max) | |
647 _icons[i-_icon_min] = icon; // Cache small integers | |
648 return icon; | |
649 } | |
650 | |
651 //------------------------------longcon---------------------------------------- | |
652 // Fast long constant. | |
653 ConLNode* PhaseTransform::longcon(jlong l) { | |
654 // Small integer? Check cache! Check that cached node is not dead | |
655 if (l >= _lcon_min && l <= _lcon_max) { | |
656 ConLNode* lcon = _lcons[l-_lcon_min]; | |
657 if (lcon != NULL && lcon->in(TypeFunc::Control) != NULL) | |
658 return lcon; | |
659 } | |
660 ConLNode* lcon = (ConLNode*) uncached_makecon(TypeLong::make(l)); | |
661 assert(lcon->is_Con(), ""); | |
662 if (l >= _lcon_min && l <= _lcon_max) | |
663 _lcons[l-_lcon_min] = lcon; // Cache small integers | |
664 return lcon; | |
665 } | |
666 | |
667 //------------------------------zerocon----------------------------------------- | |
668 // Fast zero or null constant. Same as "transform(ConNode::make(Type::get_zero_type(bt)))" | |
669 ConNode* PhaseTransform::zerocon(BasicType bt) { | |
670 assert((uint)bt <= _zcon_max, "domain check"); | |
671 ConNode* zcon = _zcons[bt]; | |
672 if (zcon != NULL && zcon->in(TypeFunc::Control) != NULL) | |
673 return zcon; | |
674 zcon = (ConNode*) uncached_makecon(Type::get_zero_type(bt)); | |
675 _zcons[bt] = zcon; | |
676 return zcon; | |
677 } | |
678 | |
679 | |
680 | |
681 //============================================================================= | |
682 //------------------------------transform-------------------------------------- | |
683 // Return a node which computes the same function as this node, but in a | |
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684 // faster or cheaper fashion. |
0 | 685 Node *PhaseGVN::transform( Node *n ) { |
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686 return transform_no_reclaim(n); |
0 | 687 } |
688 | |
689 //------------------------------transform-------------------------------------- | |
690 // Return a node which computes the same function as this node, but | |
691 // in a faster or cheaper fashion. | |
692 Node *PhaseGVN::transform_no_reclaim( Node *n ) { | |
693 NOT_PRODUCT( set_transforms(); ) | |
694 | |
695 // Apply the Ideal call in a loop until it no longer applies | |
696 Node *k = n; | |
697 NOT_PRODUCT( uint loop_count = 0; ) | |
698 while( 1 ) { | |
699 Node *i = k->Ideal(this, /*can_reshape=*/false); | |
700 if( !i ) break; | |
701 assert( i->_idx >= k->_idx, "Idealize should return new nodes, use Identity to return old nodes" ); | |
702 k = i; | |
703 assert(loop_count++ < K, "infinite loop in PhaseGVN::transform"); | |
704 } | |
705 NOT_PRODUCT( if( loop_count != 0 ) { set_progress(); } ) | |
706 | |
707 | |
708 // If brand new node, make space in type array. | |
709 ensure_type_or_null(k); | |
710 | |
711 // Since I just called 'Value' to compute the set of run-time values | |
712 // for this Node, and 'Value' is non-local (and therefore expensive) I'll | |
713 // cache Value. Later requests for the local phase->type of this Node can | |
714 // use the cached Value instead of suffering with 'bottom_type'. | |
715 const Type *t = k->Value(this); // Get runtime Value set | |
716 assert(t != NULL, "value sanity"); | |
717 if (type_or_null(k) != t) { | |
718 #ifndef PRODUCT | |
719 // Do not count initial visit to node as a transformation | |
720 if (type_or_null(k) == NULL) { | |
721 inc_new_values(); | |
722 set_progress(); | |
723 } | |
724 #endif | |
725 set_type(k, t); | |
726 // If k is a TypeNode, capture any more-precise type permanently into Node | |
727 k->raise_bottom_type(t); | |
728 } | |
729 | |
730 if( t->singleton() && !k->is_Con() ) { | |
731 NOT_PRODUCT( set_progress(); ) | |
732 return makecon(t); // Turn into a constant | |
733 } | |
734 | |
735 // Now check for Identities | |
736 Node *i = k->Identity(this); // Look for a nearby replacement | |
737 if( i != k ) { // Found? Return replacement! | |
738 NOT_PRODUCT( set_progress(); ) | |
739 return i; | |
740 } | |
741 | |
742 // Global Value Numbering | |
743 i = hash_find_insert(k); // Insert if new | |
744 if( i && (i != k) ) { | |
745 // Return the pre-existing node | |
746 NOT_PRODUCT( set_progress(); ) | |
747 return i; | |
748 } | |
749 | |
750 // Return Idealized original | |
751 return k; | |
752 } | |
753 | |
754 #ifdef ASSERT | |
755 //------------------------------dead_loop_check-------------------------------- | |
605 | 756 // Check for a simple dead loop when a data node references itself directly |
0 | 757 // or through an other data node excluding cons and phis. |
758 void PhaseGVN::dead_loop_check( Node *n ) { | |
759 // Phi may reference itself in a loop | |
760 if (n != NULL && !n->is_dead_loop_safe() && !n->is_CFG()) { | |
761 // Do 2 levels check and only data inputs. | |
762 bool no_dead_loop = true; | |
763 uint cnt = n->req(); | |
764 for (uint i = 1; i < cnt && no_dead_loop; i++) { | |
765 Node *in = n->in(i); | |
766 if (in == n) { | |
767 no_dead_loop = false; | |
768 } else if (in != NULL && !in->is_dead_loop_safe()) { | |
769 uint icnt = in->req(); | |
770 for (uint j = 1; j < icnt && no_dead_loop; j++) { | |
771 if (in->in(j) == n || in->in(j) == in) | |
772 no_dead_loop = false; | |
773 } | |
774 } | |
775 } | |
776 if (!no_dead_loop) n->dump(3); | |
777 assert(no_dead_loop, "dead loop detected"); | |
778 } | |
779 } | |
780 #endif | |
781 | |
782 //============================================================================= | |
783 //------------------------------PhaseIterGVN----------------------------------- | |
784 // Initialize hash table to fresh and clean for +VerifyOpto | |
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785 PhaseIterGVN::PhaseIterGVN( PhaseIterGVN *igvn, const char *dummy ) : PhaseGVN(igvn,dummy), _worklist( ), |
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786 _stack(C->unique() >> 1), |
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787 _delay_transform(false) { |
0 | 788 } |
789 | |
790 //------------------------------PhaseIterGVN----------------------------------- | |
791 // Initialize with previous PhaseIterGVN info; used by PhaseCCP | |
792 PhaseIterGVN::PhaseIterGVN( PhaseIterGVN *igvn ) : PhaseGVN(igvn), | |
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793 _worklist( igvn->_worklist ), |
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794 _stack( igvn->_stack ), |
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795 _delay_transform(igvn->_delay_transform) |
0 | 796 { |
797 } | |
798 | |
799 //------------------------------PhaseIterGVN----------------------------------- | |
800 // Initialize with previous PhaseGVN info from Parser | |
801 PhaseIterGVN::PhaseIterGVN( PhaseGVN *gvn ) : PhaseGVN(gvn), | |
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802 _worklist(*C->for_igvn()), |
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803 _stack(C->unique() >> 1), |
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804 _delay_transform(false) |
0 | 805 { |
806 uint max; | |
807 | |
808 // Dead nodes in the hash table inherited from GVN were not treated as | |
809 // roots during def-use info creation; hence they represent an invisible | |
810 // use. Clear them out. | |
811 max = _table.size(); | |
812 for( uint i = 0; i < max; ++i ) { | |
813 Node *n = _table.at(i); | |
814 if(n != NULL && n != _table.sentinel() && n->outcnt() == 0) { | |
815 if( n->is_top() ) continue; | |
816 assert( false, "Parse::remove_useless_nodes missed this node"); | |
817 hash_delete(n); | |
818 } | |
819 } | |
820 | |
821 // Any Phis or Regions on the worklist probably had uses that could not | |
822 // make more progress because the uses were made while the Phis and Regions | |
823 // were in half-built states. Put all uses of Phis and Regions on worklist. | |
824 max = _worklist.size(); | |
825 for( uint j = 0; j < max; j++ ) { | |
826 Node *n = _worklist.at(j); | |
827 uint uop = n->Opcode(); | |
828 if( uop == Op_Phi || uop == Op_Region || | |
829 n->is_Type() || | |
830 n->is_Mem() ) | |
831 add_users_to_worklist(n); | |
832 } | |
833 } | |
834 | |
835 | |
836 #ifndef PRODUCT | |
837 void PhaseIterGVN::verify_step(Node* n) { | |
838 _verify_window[_verify_counter % _verify_window_size] = n; | |
839 ++_verify_counter; | |
840 ResourceMark rm; | |
841 ResourceArea *area = Thread::current()->resource_area(); | |
842 VectorSet old_space(area), new_space(area); | |
843 if (C->unique() < 1000 || | |
844 0 == _verify_counter % (C->unique() < 10000 ? 10 : 100)) { | |
845 ++_verify_full_passes; | |
846 Node::verify_recur(C->root(), -1, old_space, new_space); | |
847 } | |
848 const int verify_depth = 4; | |
849 for ( int i = 0; i < _verify_window_size; i++ ) { | |
850 Node* n = _verify_window[i]; | |
851 if ( n == NULL ) continue; | |
852 if( n->in(0) == NodeSentinel ) { // xform_idom | |
853 _verify_window[i] = n->in(1); | |
854 --i; continue; | |
855 } | |
856 // Typical fanout is 1-2, so this call visits about 6 nodes. | |
857 Node::verify_recur(n, verify_depth, old_space, new_space); | |
858 } | |
859 } | |
860 #endif | |
861 | |
862 | |
863 //------------------------------init_worklist---------------------------------- | |
864 // Initialize worklist for each node. | |
865 void PhaseIterGVN::init_worklist( Node *n ) { | |
866 if( _worklist.member(n) ) return; | |
867 _worklist.push(n); | |
868 uint cnt = n->req(); | |
869 for( uint i =0 ; i < cnt; i++ ) { | |
870 Node *m = n->in(i); | |
871 if( m ) init_worklist(m); | |
872 } | |
873 } | |
874 | |
875 //------------------------------optimize--------------------------------------- | |
876 void PhaseIterGVN::optimize() { | |
877 debug_only(uint num_processed = 0;); | |
878 #ifndef PRODUCT | |
879 { | |
880 _verify_counter = 0; | |
881 _verify_full_passes = 0; | |
882 for ( int i = 0; i < _verify_window_size; i++ ) { | |
883 _verify_window[i] = NULL; | |
884 } | |
885 } | |
886 #endif | |
887 | |
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888 #ifdef ASSERT |
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889 Node* prev = NULL; |
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890 uint rep_cnt = 0; |
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891 #endif |
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892 uint loop_count = 0; |
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893 |
0 | 894 // Pull from worklist; transform node; |
895 // If node has changed: update edge info and put uses on worklist. | |
896 while( _worklist.size() ) { | |
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897 if (C->check_node_count(NodeLimitFudgeFactor * 2, |
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898 "out of nodes optimizing method")) { |
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899 return; |
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900 } |
0 | 901 Node *n = _worklist.pop(); |
10278 | 902 if (++loop_count >= K * C->live_nodes()) { |
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903 debug_only(n->dump(4);) |
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904 assert(false, "infinite loop in PhaseIterGVN::optimize"); |
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905 C->record_method_not_compilable("infinite loop in PhaseIterGVN::optimize"); |
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906 return; |
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907 } |
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908 #ifdef ASSERT |
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909 if (n == prev) { |
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910 if (++rep_cnt > 3) { |
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911 n->dump(4); |
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912 assert(false, "loop in Ideal transformation"); |
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913 } |
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914 } else { |
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915 rep_cnt = 0; |
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916 } |
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917 prev = n; |
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918 #endif |
0 | 919 if (TraceIterativeGVN && Verbose) { |
920 tty->print(" Pop "); | |
921 NOT_PRODUCT( n->dump(); ) | |
922 debug_only(if( (num_processed++ % 100) == 0 ) _worklist.print_set();) | |
923 } | |
924 | |
925 if (n->outcnt() != 0) { | |
926 | |
927 #ifndef PRODUCT | |
928 uint wlsize = _worklist.size(); | |
929 const Type* oldtype = type_or_null(n); | |
930 #endif //PRODUCT | |
931 | |
932 Node *nn = transform_old(n); | |
933 | |
934 #ifndef PRODUCT | |
935 if (TraceIterativeGVN) { | |
936 const Type* newtype = type_or_null(n); | |
937 if (nn != n) { | |
938 // print old node | |
939 tty->print("< "); | |
940 if (oldtype != newtype && oldtype != NULL) { | |
941 oldtype->dump(); | |
942 } | |
943 do { tty->print("\t"); } while (tty->position() < 16); | |
944 tty->print("<"); | |
945 n->dump(); | |
946 } | |
947 if (oldtype != newtype || nn != n) { | |
948 // print new node and/or new type | |
949 if (oldtype == NULL) { | |
950 tty->print("* "); | |
951 } else if (nn != n) { | |
952 tty->print("> "); | |
953 } else { | |
954 tty->print("= "); | |
955 } | |
956 if (newtype == NULL) { | |
957 tty->print("null"); | |
958 } else { | |
959 newtype->dump(); | |
960 } | |
961 do { tty->print("\t"); } while (tty->position() < 16); | |
962 nn->dump(); | |
963 } | |
964 if (Verbose && wlsize < _worklist.size()) { | |
965 tty->print(" Push {"); | |
966 while (wlsize != _worklist.size()) { | |
967 Node* pushed = _worklist.at(wlsize++); | |
968 tty->print(" %d", pushed->_idx); | |
969 } | |
970 tty->print_cr(" }"); | |
971 } | |
972 } | |
973 if( VerifyIterativeGVN && nn != n ) { | |
974 verify_step((Node*) NULL); // ignore n, it might be subsumed | |
975 } | |
976 #endif | |
977 } else if (!n->is_top()) { | |
978 remove_dead_node(n); | |
979 } | |
980 } | |
981 | |
982 #ifndef PRODUCT | |
983 C->verify_graph_edges(); | |
984 if( VerifyOpto && allow_progress() ) { | |
985 // Must turn off allow_progress to enable assert and break recursion | |
986 C->root()->verify(); | |
987 { // Check if any progress was missed using IterGVN | |
988 // Def-Use info enables transformations not attempted in wash-pass | |
989 // e.g. Region/Phi cleanup, ... | |
990 // Null-check elision -- may not have reached fixpoint | |
991 // do not propagate to dominated nodes | |
992 ResourceMark rm; | |
993 PhaseIterGVN igvn2(this,"Verify"); // Fresh and clean! | |
994 // Fill worklist completely | |
995 igvn2.init_worklist(C->root()); | |
996 | |
997 igvn2.set_allow_progress(false); | |
998 igvn2.optimize(); | |
999 igvn2.set_allow_progress(true); | |
1000 } | |
1001 } | |
1002 if ( VerifyIterativeGVN && PrintOpto ) { | |
1003 if ( _verify_counter == _verify_full_passes ) | |
1004 tty->print_cr("VerifyIterativeGVN: %d transforms and verify passes", | |
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1005 (int) _verify_full_passes); |
0 | 1006 else |
1007 tty->print_cr("VerifyIterativeGVN: %d transforms, %d full verify passes", | |
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1008 (int) _verify_counter, (int) _verify_full_passes); |
0 | 1009 } |
1010 #endif | |
1011 } | |
1012 | |
1013 | |
1014 //------------------register_new_node_with_optimizer--------------------------- | |
1015 // Register a new node with the optimizer. Update the types array, the def-use | |
1016 // info. Put on worklist. | |
1017 Node* PhaseIterGVN::register_new_node_with_optimizer(Node* n, Node* orig) { | |
1018 set_type_bottom(n); | |
1019 _worklist.push(n); | |
1020 if (orig != NULL) C->copy_node_notes_to(n, orig); | |
1021 return n; | |
1022 } | |
1023 | |
1024 //------------------------------transform-------------------------------------- | |
1025 // Non-recursive: idealize Node 'n' with respect to its inputs and its value | |
1026 Node *PhaseIterGVN::transform( Node *n ) { | |
113
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1027 if (_delay_transform) { |
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1028 // Register the node but don't optimize for now |
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1029 register_new_node_with_optimizer(n); |
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1030 return n; |
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1031 } |
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1032 |
0 | 1033 // If brand new node, make space in type array, and give it a type. |
1034 ensure_type_or_null(n); | |
1035 if (type_or_null(n) == NULL) { | |
1036 set_type_bottom(n); | |
1037 } | |
1038 | |
1039 return transform_old(n); | |
1040 } | |
1041 | |
1042 //------------------------------transform_old---------------------------------- | |
1043 Node *PhaseIterGVN::transform_old( Node *n ) { | |
1044 #ifndef PRODUCT | |
1045 debug_only(uint loop_count = 0;); | |
1046 set_transforms(); | |
1047 #endif | |
1048 // Remove 'n' from hash table in case it gets modified | |
1049 _table.hash_delete(n); | |
1050 if( VerifyIterativeGVN ) { | |
1051 assert( !_table.find_index(n->_idx), "found duplicate entry in table"); | |
1052 } | |
1053 | |
1054 // Apply the Ideal call in a loop until it no longer applies | |
1055 Node *k = n; | |
1056 DEBUG_ONLY(dead_loop_check(k);) | |
305 | 1057 DEBUG_ONLY(bool is_new = (k->outcnt() == 0);) |
0 | 1058 Node *i = k->Ideal(this, /*can_reshape=*/true); |
305 | 1059 assert(i != k || is_new || i->outcnt() > 0, "don't return dead nodes"); |
0 | 1060 #ifndef PRODUCT |
1061 if( VerifyIterativeGVN ) | |
1062 verify_step(k); | |
1063 if( i && VerifyOpto ) { | |
1064 if( !allow_progress() ) { | |
1065 if (i->is_Add() && i->outcnt() == 1) { | |
1066 // Switched input to left side because this is the only use | |
1067 } else if( i->is_If() && (i->in(0) == NULL) ) { | |
1068 // This IF is dead because it is dominated by an equivalent IF When | |
1069 // dominating if changed, info is not propagated sparsely to 'this' | |
1070 // Propagating this info further will spuriously identify other | |
1071 // progress. | |
1072 return i; | |
1073 } else | |
1074 set_progress(); | |
1075 } else | |
1076 set_progress(); | |
1077 } | |
1078 #endif | |
1079 | |
1080 while( i ) { | |
1081 #ifndef PRODUCT | |
1082 debug_only( if( loop_count >= K ) i->dump(4); ) | |
1083 assert(loop_count < K, "infinite loop in PhaseIterGVN::transform"); | |
1084 debug_only( loop_count++; ) | |
1085 #endif | |
1086 assert((i->_idx >= k->_idx) || i->is_top(), "Idealize should return new nodes, use Identity to return old nodes"); | |
1087 // Made a change; put users of original Node on worklist | |
1088 add_users_to_worklist( k ); | |
1089 // Replacing root of transform tree? | |
1090 if( k != i ) { | |
1091 // Make users of old Node now use new. | |
1092 subsume_node( k, i ); | |
1093 k = i; | |
1094 } | |
1095 DEBUG_ONLY(dead_loop_check(k);) | |
1096 // Try idealizing again | |
305 | 1097 DEBUG_ONLY(is_new = (k->outcnt() == 0);) |
0 | 1098 i = k->Ideal(this, /*can_reshape=*/true); |
305 | 1099 assert(i != k || is_new || i->outcnt() > 0, "don't return dead nodes"); |
0 | 1100 #ifndef PRODUCT |
1101 if( VerifyIterativeGVN ) | |
1102 verify_step(k); | |
1103 if( i && VerifyOpto ) set_progress(); | |
1104 #endif | |
1105 } | |
1106 | |
1107 // If brand new node, make space in type array. | |
1108 ensure_type_or_null(k); | |
1109 | |
1110 // See what kind of values 'k' takes on at runtime | |
1111 const Type *t = k->Value(this); | |
1112 assert(t != NULL, "value sanity"); | |
1113 | |
1114 // Since I just called 'Value' to compute the set of run-time values | |
1115 // for this Node, and 'Value' is non-local (and therefore expensive) I'll | |
1116 // cache Value. Later requests for the local phase->type of this Node can | |
1117 // use the cached Value instead of suffering with 'bottom_type'. | |
1118 if (t != type_or_null(k)) { | |
1119 NOT_PRODUCT( set_progress(); ) | |
1120 NOT_PRODUCT( inc_new_values();) | |
1121 set_type(k, t); | |
1122 // If k is a TypeNode, capture any more-precise type permanently into Node | |
1123 k->raise_bottom_type(t); | |
1124 // Move users of node to worklist | |
1125 add_users_to_worklist( k ); | |
1126 } | |
1127 | |
1128 // If 'k' computes a constant, replace it with a constant | |
1129 if( t->singleton() && !k->is_Con() ) { | |
1130 NOT_PRODUCT( set_progress(); ) | |
1131 Node *con = makecon(t); // Make a constant | |
1132 add_users_to_worklist( k ); | |
1133 subsume_node( k, con ); // Everybody using k now uses con | |
1134 return con; | |
1135 } | |
1136 | |
1137 // Now check for Identities | |
1138 i = k->Identity(this); // Look for a nearby replacement | |
1139 if( i != k ) { // Found? Return replacement! | |
1140 NOT_PRODUCT( set_progress(); ) | |
1141 add_users_to_worklist( k ); | |
1142 subsume_node( k, i ); // Everybody using k now uses i | |
1143 return i; | |
1144 } | |
1145 | |
1146 // Global Value Numbering | |
1147 i = hash_find_insert(k); // Check for pre-existing node | |
1148 if( i && (i != k) ) { | |
1149 // Return the pre-existing node if it isn't dead | |
1150 NOT_PRODUCT( set_progress(); ) | |
1151 add_users_to_worklist( k ); | |
1152 subsume_node( k, i ); // Everybody using k now uses i | |
1153 return i; | |
1154 } | |
1155 | |
1156 // Return Idealized original | |
1157 return k; | |
1158 } | |
1159 | |
1160 //---------------------------------saturate------------------------------------ | |
1161 const Type* PhaseIterGVN::saturate(const Type* new_type, const Type* old_type, | |
1162 const Type* limit_type) const { | |
1163 return new_type->narrow(old_type); | |
1164 } | |
1165 | |
1166 //------------------------------remove_globally_dead_node---------------------- | |
1167 // Kill a globally dead Node. All uses are also globally dead and are | |
1168 // aggressively trimmed. | |
1169 void PhaseIterGVN::remove_globally_dead_node( Node *dead ) { | |
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1170 enum DeleteProgress { |
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1171 PROCESS_INPUTS, |
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1172 PROCESS_OUTPUTS |
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1173 }; |
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1174 assert(_stack.is_empty(), "not empty"); |
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1175 _stack.push(dead, PROCESS_INPUTS); |
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1176 |
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1177 while (_stack.is_nonempty()) { |
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1178 dead = _stack.node(); |
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1179 uint progress_state = _stack.index(); |
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1180 assert(dead != C->root(), "killing root, eh?"); |
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1181 assert(!dead->is_top(), "add check for top when pushing"); |
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1182 NOT_PRODUCT( set_progress(); ) |
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1183 if (progress_state == PROCESS_INPUTS) { |
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1184 // After following inputs, continue to outputs |
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1185 _stack.set_index(PROCESS_OUTPUTS); |
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1186 if (!dead->is_Con()) { // Don't kill cons but uses |
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1187 bool recurse = false; |
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1188 // Remove from hash table |
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1189 _table.hash_delete( dead ); |
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1190 // Smash all inputs to 'dead', isolating him completely |
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1191 for (uint i = 0; i < dead->req(); i++) { |
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1192 Node *in = dead->in(i); |
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1193 if (in != NULL && in != C->top()) { // Points to something? |
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1194 int nrep = dead->replace_edge(in, NULL); // Kill edges |
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1195 assert((nrep > 0), "sanity"); |
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1196 if (in->outcnt() == 0) { // Made input go dead? |
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1197 _stack.push(in, PROCESS_INPUTS); // Recursively remove |
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1198 recurse = true; |
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1199 } else if (in->outcnt() == 1 && |
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1200 in->has_special_unique_user()) { |
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1201 _worklist.push(in->unique_out()); |
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1202 } else if (in->outcnt() <= 2 && dead->is_Phi()) { |
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1203 if (in->Opcode() == Op_Region) { |
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1204 _worklist.push(in); |
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1205 } else if (in->is_Store()) { |
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1206 DUIterator_Fast imax, i = in->fast_outs(imax); |
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1207 _worklist.push(in->fast_out(i)); |
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1208 i++; |
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1209 if (in->outcnt() == 2) { |
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1210 _worklist.push(in->fast_out(i)); |
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1211 i++; |
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1212 } |
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1213 assert(!(i < imax), "sanity"); |
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1214 } |
0 | 1215 } |
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1216 if (ReduceFieldZeroing && dead->is_Load() && i == MemNode::Memory && |
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1217 in->is_Proj() && in->in(0) != NULL && in->in(0)->is_Initialize()) { |
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1218 // A Load that directly follows an InitializeNode is |
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1219 // going away. The Stores that follow are candidates |
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1220 // again to be captured by the InitializeNode. |
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1221 for (DUIterator_Fast jmax, j = in->fast_outs(jmax); j < jmax; j++) { |
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1222 Node *n = in->fast_out(j); |
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1223 if (n->is_Store()) { |
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1224 _worklist.push(n); |
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1225 } |
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1226 } |
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1227 } |
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1228 } // if (in != NULL && in != C->top()) |
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1229 } // for (uint i = 0; i < dead->req(); i++) |
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1230 if (recurse) { |
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1231 continue; |
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1232 } |
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1233 } // if (!dead->is_Con()) |
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1234 } // if (progress_state == PROCESS_INPUTS) |
0 | 1235 |
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1236 // Aggressively kill globally dead uses |
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1237 // (Rather than pushing all the outs at once, we push one at a time, |
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1238 // plus the parent to resume later, because of the indefinite number |
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1239 // of edge deletions per loop trip.) |
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1240 if (dead->outcnt() > 0) { |
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1241 // Recursively remove output edges |
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1242 _stack.push(dead->raw_out(0), PROCESS_INPUTS); |
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1243 } else { |
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1244 // Finished disconnecting all input and output edges. |
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1245 _stack.pop(); |
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1246 // Remove dead node from iterative worklist |
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1247 _worklist.remove(dead); |
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1248 // Constant node that has no out-edges and has only one in-edge from |
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1249 // root is usually dead. However, sometimes reshaping walk makes |
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1250 // it reachable by adding use edges. So, we will NOT count Con nodes |
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1251 // as dead to be conservative about the dead node count at any |
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1252 // given time. |
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1253 if (!dead->is_Con()) { |
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1254 C->record_dead_node(dead->_idx); |
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1255 } |
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1256 if (dead->is_macro()) { |
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1257 C->remove_macro_node(dead); |
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1258 } |
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1259 if (dead->is_expensive()) { |
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1260 C->remove_expensive_node(dead); |
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1261 } |
0 | 1262 } |
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1263 } // while (_stack.is_nonempty()) |
0 | 1264 } |
1265 | |
1266 //------------------------------subsume_node----------------------------------- | |
1267 // Remove users from node 'old' and add them to node 'nn'. | |
1268 void PhaseIterGVN::subsume_node( Node *old, Node *nn ) { | |
1269 assert( old != hash_find(old), "should already been removed" ); | |
1270 assert( old != C->top(), "cannot subsume top node"); | |
1271 // Copy debug or profile information to the new version: | |
1272 C->copy_node_notes_to(nn, old); | |
1273 // Move users of node 'old' to node 'nn' | |
1274 for (DUIterator_Last imin, i = old->last_outs(imin); i >= imin; ) { | |
1275 Node* use = old->last_out(i); // for each use... | |
1276 // use might need re-hashing (but it won't if it's a new node) | |
1277 bool is_in_table = _table.hash_delete( use ); | |
1278 // Update use-def info as well | |
1279 // We remove all occurrences of old within use->in, | |
1280 // so as to avoid rehashing any node more than once. | |
1281 // The hash table probe swamps any outer loop overhead. | |
1282 uint num_edges = 0; | |
1283 for (uint jmax = use->len(), j = 0; j < jmax; j++) { | |
1284 if (use->in(j) == old) { | |
1285 use->set_req(j, nn); | |
1286 ++num_edges; | |
1287 } | |
1288 } | |
1289 // Insert into GVN hash table if unique | |
1290 // If a duplicate, 'use' will be cleaned up when pulled off worklist | |
1291 if( is_in_table ) { | |
1292 hash_find_insert(use); | |
1293 } | |
1294 i -= num_edges; // we deleted 1 or more copies of this edge | |
1295 } | |
1296 | |
1297 // Smash all inputs to 'old', isolating him completely | |
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1298 Node *temp = new (C) Node(1); |
0 | 1299 temp->init_req(0,nn); // Add a use to nn to prevent him from dying |
1300 remove_dead_node( old ); | |
1301 temp->del_req(0); // Yank bogus edge | |
1302 #ifndef PRODUCT | |
1303 if( VerifyIterativeGVN ) { | |
1304 for ( int i = 0; i < _verify_window_size; i++ ) { | |
1305 if ( _verify_window[i] == old ) | |
1306 _verify_window[i] = nn; | |
1307 } | |
1308 } | |
1309 #endif | |
1310 _worklist.remove(temp); // this can be necessary | |
1311 temp->destruct(); // reuse the _idx of this little guy | |
1312 } | |
1313 | |
1314 //------------------------------add_users_to_worklist-------------------------- | |
1315 void PhaseIterGVN::add_users_to_worklist0( Node *n ) { | |
1316 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1317 _worklist.push(n->fast_out(i)); // Push on worklist | |
1318 } | |
1319 } | |
1320 | |
1321 void PhaseIterGVN::add_users_to_worklist( Node *n ) { | |
1322 add_users_to_worklist0(n); | |
1323 | |
1324 // Move users of node to worklist | |
1325 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1326 Node* use = n->fast_out(i); // Get use | |
1327 | |
1328 if( use->is_Multi() || // Multi-definer? Push projs on worklist | |
1329 use->is_Store() ) // Enable store/load same address | |
1330 add_users_to_worklist0(use); | |
1331 | |
1332 // If we changed the receiver type to a call, we need to revisit | |
1333 // the Catch following the call. It's looking for a non-NULL | |
1334 // receiver to know when to enable the regular fall-through path | |
1335 // in addition to the NullPtrException path. | |
1336 if (use->is_CallDynamicJava() && n == use->in(TypeFunc::Parms)) { | |
1337 Node* p = use->as_CallDynamicJava()->proj_out(TypeFunc::Control); | |
1338 if (p != NULL) { | |
1339 add_users_to_worklist0(p); | |
1340 } | |
1341 } | |
1342 | |
1343 if( use->is_Cmp() ) { // Enable CMP/BOOL optimization | |
1344 add_users_to_worklist(use); // Put Bool on worklist | |
1345 // Look for the 'is_x2logic' pattern: "x ? : 0 : 1" and put the | |
1346 // phi merging either 0 or 1 onto the worklist | |
1347 if (use->outcnt() > 0) { | |
1348 Node* bol = use->raw_out(0); | |
1349 if (bol->outcnt() > 0) { | |
1350 Node* iff = bol->raw_out(0); | |
1351 if (iff->outcnt() == 2) { | |
1352 Node* ifproj0 = iff->raw_out(0); | |
1353 Node* ifproj1 = iff->raw_out(1); | |
1354 if (ifproj0->outcnt() > 0 && ifproj1->outcnt() > 0) { | |
1355 Node* region0 = ifproj0->raw_out(0); | |
1356 Node* region1 = ifproj1->raw_out(0); | |
1357 if( region0 == region1 ) | |
1358 add_users_to_worklist0(region0); | |
1359 } | |
1360 } | |
1361 } | |
1362 } | |
1363 } | |
1364 | |
1365 uint use_op = use->Opcode(); | |
1366 // If changed Cast input, check Phi users for simple cycles | |
65 | 1367 if( use->is_ConstraintCast() || use->is_CheckCastPP() ) { |
0 | 1368 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { |
1369 Node* u = use->fast_out(i2); | |
1370 if (u->is_Phi()) | |
1371 _worklist.push(u); | |
1372 } | |
1373 } | |
1374 // If changed LShift inputs, check RShift users for useless sign-ext | |
1375 if( use_op == Op_LShiftI ) { | |
1376 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { | |
1377 Node* u = use->fast_out(i2); | |
1378 if (u->Opcode() == Op_RShiftI) | |
1379 _worklist.push(u); | |
1380 } | |
1381 } | |
17936 | 1382 // If changed AddI/SubI inputs, check CmpU for range check optimization. |
1383 if (use_op == Op_AddI || use_op == Op_SubI) { | |
1384 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { | |
1385 Node* u = use->fast_out(i2); | |
1386 if (u->is_Cmp() && (u->Opcode() == Op_CmpU)) { | |
1387 _worklist.push(u); | |
1388 } | |
1389 } | |
1390 } | |
0 | 1391 // If changed AddP inputs, check Stores for loop invariant |
1392 if( use_op == Op_AddP ) { | |
1393 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { | |
1394 Node* u = use->fast_out(i2); | |
1395 if (u->is_Mem()) | |
1396 _worklist.push(u); | |
1397 } | |
1398 } | |
1399 // If changed initialization activity, check dependent Stores | |
1400 if (use_op == Op_Allocate || use_op == Op_AllocateArray) { | |
1401 InitializeNode* init = use->as_Allocate()->initialization(); | |
1402 if (init != NULL) { | |
1403 Node* imem = init->proj_out(TypeFunc::Memory); | |
1404 if (imem != NULL) add_users_to_worklist0(imem); | |
1405 } | |
1406 } | |
1407 if (use_op == Op_Initialize) { | |
1408 Node* imem = use->as_Initialize()->proj_out(TypeFunc::Memory); | |
1409 if (imem != NULL) add_users_to_worklist0(imem); | |
1410 } | |
1411 } | |
1412 } | |
1413 | |
12966 | 1414 /** |
1415 * Remove the speculative part of all types that we know of | |
1416 */ | |
1417 void PhaseIterGVN::remove_speculative_types() { | |
1418 assert(UseTypeSpeculation, "speculation is off"); | |
1419 for (uint i = 0; i < _types.Size(); i++) { | |
1420 const Type* t = _types.fast_lookup(i); | |
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1421 if (t != NULL) { |
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1422 _types.map(i, t->remove_speculative()); |
12966 | 1423 } |
1424 } | |
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1425 _table.check_no_speculative_types(); |
12966 | 1426 } |
1427 | |
0 | 1428 //============================================================================= |
1429 #ifndef PRODUCT | |
1430 uint PhaseCCP::_total_invokes = 0; | |
1431 uint PhaseCCP::_total_constants = 0; | |
1432 #endif | |
1433 //------------------------------PhaseCCP--------------------------------------- | |
1434 // Conditional Constant Propagation, ala Wegman & Zadeck | |
1435 PhaseCCP::PhaseCCP( PhaseIterGVN *igvn ) : PhaseIterGVN(igvn) { | |
1436 NOT_PRODUCT( clear_constants(); ) | |
1437 assert( _worklist.size() == 0, "" ); | |
1438 // Clear out _nodes from IterGVN. Must be clear to transform call. | |
1439 _nodes.clear(); // Clear out from IterGVN | |
1440 analyze(); | |
1441 } | |
1442 | |
1443 #ifndef PRODUCT | |
1444 //------------------------------~PhaseCCP-------------------------------------- | |
1445 PhaseCCP::~PhaseCCP() { | |
1446 inc_invokes(); | |
1447 _total_constants += count_constants(); | |
1448 } | |
1449 #endif | |
1450 | |
1451 | |
1452 #ifdef ASSERT | |
1453 static bool ccp_type_widens(const Type* t, const Type* t0) { | |
1454 assert(t->meet(t0) == t, "Not monotonic"); | |
1455 switch (t->base() == t0->base() ? t->base() : Type::Top) { | |
1456 case Type::Int: | |
1457 assert(t0->isa_int()->_widen <= t->isa_int()->_widen, "widen increases"); | |
1458 break; | |
1459 case Type::Long: | |
1460 assert(t0->isa_long()->_widen <= t->isa_long()->_widen, "widen increases"); | |
1461 break; | |
1462 } | |
1463 return true; | |
1464 } | |
1465 #endif //ASSERT | |
1466 | |
1467 //------------------------------analyze---------------------------------------- | |
1468 void PhaseCCP::analyze() { | |
1469 // Initialize all types to TOP, optimistic analysis | |
1470 for (int i = C->unique() - 1; i >= 0; i--) { | |
1471 _types.map(i,Type::TOP); | |
1472 } | |
1473 | |
1474 // Push root onto worklist | |
1475 Unique_Node_List worklist; | |
1476 worklist.push(C->root()); | |
1477 | |
1478 // Pull from worklist; compute new value; push changes out. | |
1479 // This loop is the meat of CCP. | |
1480 while( worklist.size() ) { | |
1481 Node *n = worklist.pop(); | |
1482 const Type *t = n->Value(this); | |
1483 if (t != type(n)) { | |
1484 assert(ccp_type_widens(t, type(n)), "ccp type must widen"); | |
1485 #ifndef PRODUCT | |
1486 if( TracePhaseCCP ) { | |
1487 t->dump(); | |
1488 do { tty->print("\t"); } while (tty->position() < 16); | |
1489 n->dump(); | |
1490 } | |
1491 #endif | |
1492 set_type(n, t); | |
1493 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1494 Node* m = n->fast_out(i); // Get user | |
1495 if( m->is_Region() ) { // New path to Region? Must recheck Phis too | |
1496 for (DUIterator_Fast i2max, i2 = m->fast_outs(i2max); i2 < i2max; i2++) { | |
1497 Node* p = m->fast_out(i2); // Propagate changes to uses | |
1498 if( p->bottom_type() != type(p) ) // If not already bottomed out | |
1499 worklist.push(p); // Propagate change to user | |
1500 } | |
1501 } | |
605 | 1502 // If we changed the receiver type to a call, we need to revisit |
0 | 1503 // the Catch following the call. It's looking for a non-NULL |
1504 // receiver to know when to enable the regular fall-through path | |
1505 // in addition to the NullPtrException path | |
1506 if (m->is_Call()) { | |
1507 for (DUIterator_Fast i2max, i2 = m->fast_outs(i2max); i2 < i2max; i2++) { | |
1508 Node* p = m->fast_out(i2); // Propagate changes to uses | |
1509 if (p->is_Proj() && p->as_Proj()->_con == TypeFunc::Control && p->outcnt() == 1) | |
1510 worklist.push(p->unique_out()); | |
1511 } | |
1512 } | |
1513 if( m->bottom_type() != type(m) ) // If not already bottomed out | |
1514 worklist.push(m); // Propagate change to user | |
1515 } | |
1516 } | |
1517 } | |
1518 } | |
1519 | |
1520 //------------------------------do_transform----------------------------------- | |
1521 // Top level driver for the recursive transformer | |
1522 void PhaseCCP::do_transform() { | |
1523 // Correct leaves of new-space Nodes; they point to old-space. | |
1524 C->set_root( transform(C->root())->as_Root() ); | |
1525 assert( C->top(), "missing TOP node" ); | |
1526 assert( C->root(), "missing root" ); | |
1527 } | |
1528 | |
1529 //------------------------------transform-------------------------------------- | |
1530 // Given a Node in old-space, clone him into new-space. | |
1531 // Convert any of his old-space children into new-space children. | |
1532 Node *PhaseCCP::transform( Node *n ) { | |
1533 Node *new_node = _nodes[n->_idx]; // Check for transformed node | |
1534 if( new_node != NULL ) | |
1535 return new_node; // Been there, done that, return old answer | |
1536 new_node = transform_once(n); // Check for constant | |
1537 _nodes.map( n->_idx, new_node ); // Flag as having been cloned | |
1538 | |
1539 // Allocate stack of size _nodes.Size()/2 to avoid frequent realloc | |
1540 GrowableArray <Node *> trstack(C->unique() >> 1); | |
1541 | |
1542 trstack.push(new_node); // Process children of cloned node | |
1543 while ( trstack.is_nonempty() ) { | |
1544 Node *clone = trstack.pop(); | |
1545 uint cnt = clone->req(); | |
1546 for( uint i = 0; i < cnt; i++ ) { // For all inputs do | |
1547 Node *input = clone->in(i); | |
1548 if( input != NULL ) { // Ignore NULLs | |
1549 Node *new_input = _nodes[input->_idx]; // Check for cloned input node | |
1550 if( new_input == NULL ) { | |
1551 new_input = transform_once(input); // Check for constant | |
1552 _nodes.map( input->_idx, new_input );// Flag as having been cloned | |
1553 trstack.push(new_input); | |
1554 } | |
1555 assert( new_input == clone->in(i), "insanity check"); | |
1556 } | |
1557 } | |
1558 } | |
1559 return new_node; | |
1560 } | |
1561 | |
1562 | |
1563 //------------------------------transform_once--------------------------------- | |
1564 // For PhaseCCP, transformation is IDENTITY unless Node computed a constant. | |
1565 Node *PhaseCCP::transform_once( Node *n ) { | |
1566 const Type *t = type(n); | |
1567 // Constant? Use constant Node instead | |
1568 if( t->singleton() ) { | |
1569 Node *nn = n; // Default is to return the original constant | |
1570 if( t == Type::TOP ) { | |
1571 // cache my top node on the Compile instance | |
1572 if( C->cached_top_node() == NULL || C->cached_top_node()->in(0) == NULL ) { | |
1573 C->set_cached_top_node( ConNode::make(C, Type::TOP) ); | |
1574 set_type(C->top(), Type::TOP); | |
1575 } | |
1576 nn = C->top(); | |
1577 } | |
1578 if( !n->is_Con() ) { | |
1579 if( t != Type::TOP ) { | |
1580 nn = makecon(t); // ConNode::make(t); | |
1581 NOT_PRODUCT( inc_constants(); ) | |
1582 } else if( n->is_Region() ) { // Unreachable region | |
1583 // Note: nn == C->top() | |
1584 n->set_req(0, NULL); // Cut selfreference | |
1585 // Eagerly remove dead phis to avoid phis copies creation. | |
1586 for (DUIterator i = n->outs(); n->has_out(i); i++) { | |
1587 Node* m = n->out(i); | |
1588 if( m->is_Phi() ) { | |
1589 assert(type(m) == Type::TOP, "Unreachable region should not have live phis."); | |
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1590 replace_node(m, nn); |
0 | 1591 --i; // deleted this phi; rescan starting with next position |
1592 } | |
1593 } | |
1594 } | |
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1595 replace_node(n,nn); // Update DefUse edges for new constant |
0 | 1596 } |
1597 return nn; | |
1598 } | |
1599 | |
1600 // If x is a TypeNode, capture any more-precise type permanently into Node | |
1601 if (t != n->bottom_type()) { | |
1602 hash_delete(n); // changing bottom type may force a rehash | |
1603 n->raise_bottom_type(t); | |
1604 _worklist.push(n); // n re-enters the hash table via the worklist | |
1605 } | |
1606 | |
1607 // Idealize graph using DU info. Must clone() into new-space. | |
1608 // DU info is generally used to show profitability, progress or safety | |
1609 // (but generally not needed for correctness). | |
1610 Node *nn = n->Ideal_DU_postCCP(this); | |
1611 | |
1612 // TEMPORARY fix to ensure that 2nd GVN pass eliminates NULL checks | |
1613 switch( n->Opcode() ) { | |
1614 case Op_FastLock: // Revisit FastLocks for lock coarsening | |
1615 case Op_If: | |
1616 case Op_CountedLoopEnd: | |
1617 case Op_Region: | |
1618 case Op_Loop: | |
1619 case Op_CountedLoop: | |
1620 case Op_Conv2B: | |
1621 case Op_Opaque1: | |
1622 case Op_Opaque2: | |
1623 _worklist.push(n); | |
1624 break; | |
1625 default: | |
1626 break; | |
1627 } | |
1628 if( nn ) { | |
1629 _worklist.push(n); | |
1630 // Put users of 'n' onto worklist for second igvn transform | |
1631 add_users_to_worklist(n); | |
1632 return nn; | |
1633 } | |
1634 | |
1635 return n; | |
1636 } | |
1637 | |
1638 //---------------------------------saturate------------------------------------ | |
1639 const Type* PhaseCCP::saturate(const Type* new_type, const Type* old_type, | |
1640 const Type* limit_type) const { | |
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1641 const Type* wide_type = new_type->widen(old_type, limit_type); |
0 | 1642 if (wide_type != new_type) { // did we widen? |
1643 // If so, we may have widened beyond the limit type. Clip it back down. | |
1644 new_type = wide_type->filter(limit_type); | |
1645 } | |
1646 return new_type; | |
1647 } | |
1648 | |
1649 //------------------------------print_statistics------------------------------- | |
1650 #ifndef PRODUCT | |
1651 void PhaseCCP::print_statistics() { | |
1652 tty->print_cr("CCP: %d constants found: %d", _total_invokes, _total_constants); | |
1653 } | |
1654 #endif | |
1655 | |
1656 | |
1657 //============================================================================= | |
1658 #ifndef PRODUCT | |
1659 uint PhasePeephole::_total_peepholes = 0; | |
1660 #endif | |
1661 //------------------------------PhasePeephole---------------------------------- | |
1662 // Conditional Constant Propagation, ala Wegman & Zadeck | |
1663 PhasePeephole::PhasePeephole( PhaseRegAlloc *regalloc, PhaseCFG &cfg ) | |
1664 : PhaseTransform(Peephole), _regalloc(regalloc), _cfg(cfg) { | |
1665 NOT_PRODUCT( clear_peepholes(); ) | |
1666 } | |
1667 | |
1668 #ifndef PRODUCT | |
1669 //------------------------------~PhasePeephole--------------------------------- | |
1670 PhasePeephole::~PhasePeephole() { | |
1671 _total_peepholes += count_peepholes(); | |
1672 } | |
1673 #endif | |
1674 | |
1675 //------------------------------transform-------------------------------------- | |
1676 Node *PhasePeephole::transform( Node *n ) { | |
1677 ShouldNotCallThis(); | |
1678 return NULL; | |
1679 } | |
1680 | |
1681 //------------------------------do_transform----------------------------------- | |
1682 void PhasePeephole::do_transform() { | |
1683 bool method_name_not_printed = true; | |
1684 | |
1685 // Examine each basic block | |
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1686 for (uint block_number = 1; block_number < _cfg.number_of_blocks(); ++block_number) { |
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1687 Block* block = _cfg.get_block(block_number); |
0 | 1688 bool block_not_printed = true; |
1689 | |
1690 // and each instruction within a block | |
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1691 uint end_index = block->number_of_nodes(); |
0 | 1692 // block->end_idx() not valid after PhaseRegAlloc |
1693 for( uint instruction_index = 1; instruction_index < end_index; ++instruction_index ) { | |
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1694 Node *n = block->get_node(instruction_index); |
0 | 1695 if( n->is_Mach() ) { |
1696 MachNode *m = n->as_Mach(); | |
1697 int deleted_count = 0; | |
1698 // check for peephole opportunities | |
1699 MachNode *m2 = m->peephole( block, instruction_index, _regalloc, deleted_count, C ); | |
1700 if( m2 != NULL ) { | |
1701 #ifndef PRODUCT | |
1702 if( PrintOptoPeephole ) { | |
1703 // Print method, first time only | |
1704 if( C->method() && method_name_not_printed ) { | |
1705 C->method()->print_short_name(); tty->cr(); | |
1706 method_name_not_printed = false; | |
1707 } | |
1708 // Print this block | |
1709 if( Verbose && block_not_printed) { | |
1710 tty->print_cr("in block"); | |
1711 block->dump(); | |
1712 block_not_printed = false; | |
1713 } | |
1714 // Print instructions being deleted | |
1715 for( int i = (deleted_count - 1); i >= 0; --i ) { | |
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1716 block->get_node(instruction_index-i)->as_Mach()->format(_regalloc); tty->cr(); |
0 | 1717 } |
1718 tty->print_cr("replaced with"); | |
1719 // Print new instruction | |
1720 m2->format(_regalloc); | |
1721 tty->print("\n\n"); | |
1722 } | |
1723 #endif | |
1724 // Remove old nodes from basic block and update instruction_index | |
1725 // (old nodes still exist and may have edges pointing to them | |
1726 // as register allocation info is stored in the allocator using | |
1727 // the node index to live range mappings.) | |
1728 uint safe_instruction_index = (instruction_index - deleted_count); | |
1729 for( ; (instruction_index > safe_instruction_index); --instruction_index ) { | |
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1730 block->remove_node( instruction_index ); |
0 | 1731 } |
1732 // install new node after safe_instruction_index | |
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1733 block->insert_node(m2, safe_instruction_index + 1); |
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1734 end_index = block->number_of_nodes() - 1; // Recompute new block size |
0 | 1735 NOT_PRODUCT( inc_peepholes(); ) |
1736 } | |
1737 } | |
1738 } | |
1739 } | |
1740 } | |
1741 | |
1742 //------------------------------print_statistics------------------------------- | |
1743 #ifndef PRODUCT | |
1744 void PhasePeephole::print_statistics() { | |
1745 tty->print_cr("Peephole: peephole rules applied: %d", _total_peepholes); | |
1746 } | |
1747 #endif | |
1748 | |
1749 | |
1750 //============================================================================= | |
1751 //------------------------------set_req_X-------------------------------------- | |
1752 void Node::set_req_X( uint i, Node *n, PhaseIterGVN *igvn ) { | |
1753 assert( is_not_dead(n), "can not use dead node"); | |
1754 assert( igvn->hash_find(this) != this, "Need to remove from hash before changing edges" ); | |
1755 Node *old = in(i); | |
1756 set_req(i, n); | |
1757 | |
1758 // old goes dead? | |
1759 if( old ) { | |
1760 switch (old->outcnt()) { | |
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1761 case 0: |
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1762 // Put into the worklist to kill later. We do not kill it now because the |
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1763 // recursive kill will delete the current node (this) if dead-loop exists |
0 | 1764 if (!old->is_top()) |
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1765 igvn->_worklist.push( old ); |
0 | 1766 break; |
1767 case 1: | |
1768 if( old->is_Store() || old->has_special_unique_user() ) | |
1769 igvn->add_users_to_worklist( old ); | |
1770 break; | |
1771 case 2: | |
1772 if( old->is_Store() ) | |
1773 igvn->add_users_to_worklist( old ); | |
1774 if( old->Opcode() == Op_Region ) | |
1775 igvn->_worklist.push(old); | |
1776 break; | |
1777 case 3: | |
1778 if( old->Opcode() == Op_Region ) { | |
1779 igvn->_worklist.push(old); | |
1780 igvn->add_users_to_worklist( old ); | |
1781 } | |
1782 break; | |
1783 default: | |
1784 break; | |
1785 } | |
1786 } | |
1787 | |
1788 } | |
1789 | |
1790 //-------------------------------replace_by----------------------------------- | |
1791 // Using def-use info, replace one node for another. Follow the def-use info | |
1792 // to all users of the OLD node. Then make all uses point to the NEW node. | |
1793 void Node::replace_by(Node *new_node) { | |
1794 assert(!is_top(), "top node has no DU info"); | |
1795 for (DUIterator_Last imin, i = last_outs(imin); i >= imin; ) { | |
1796 Node* use = last_out(i); | |
1797 uint uses_found = 0; | |
1798 for (uint j = 0; j < use->len(); j++) { | |
1799 if (use->in(j) == this) { | |
1800 if (j < use->req()) | |
1801 use->set_req(j, new_node); | |
1802 else use->set_prec(j, new_node); | |
1803 uses_found++; | |
1804 } | |
1805 } | |
1806 i -= uses_found; // we deleted 1 or more copies of this edge | |
1807 } | |
1808 } | |
1809 | |
1810 //============================================================================= | |
1811 //----------------------------------------------------------------------------- | |
1812 void Type_Array::grow( uint i ) { | |
1813 if( !_max ) { | |
1814 _max = 1; | |
1815 _types = (const Type**)_a->Amalloc( _max * sizeof(Type*) ); | |
1816 _types[0] = NULL; | |
1817 } | |
1818 uint old = _max; | |
1819 while( i >= _max ) _max <<= 1; // Double to fit | |
1820 _types = (const Type**)_a->Arealloc( _types, old*sizeof(Type*),_max*sizeof(Type*)); | |
1821 memset( &_types[old], 0, (_max-old)*sizeof(Type*) ); | |
1822 } | |
1823 | |
1824 //------------------------------dump------------------------------------------- | |
1825 #ifndef PRODUCT | |
1826 void Type_Array::dump() const { | |
1827 uint max = Size(); | |
1828 for( uint i = 0; i < max; i++ ) { | |
1829 if( _types[i] != NULL ) { | |
1830 tty->print(" %d\t== ", i); _types[i]->dump(); tty->cr(); | |
1831 } | |
1832 } | |
1833 } | |
1834 #endif |