Mercurial > hg > truffle
annotate src/share/vm/opto/phaseX.cpp @ 15313:74c3ceb55e57
Override asNode() in FloatingNode and FixedWithNextNode.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Tue, 22 Apr 2014 16:21:37 +0200 |
parents | 4ca6dc0799b6 |
children | 89152779163c |
rev | line source |
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0 | 1 /* |
14909 | 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 | |
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 | |
326 #ifndef PRODUCT | |
327 //------------------------------dump------------------------------------------- | |
328 // Dump statistics for the hash table | |
329 void NodeHash::dump() { | |
330 _total_inserts += _inserts; | |
331 _total_insert_probes += _insert_probes; | |
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332 if (PrintCompilation && PrintOptoStatistics && Verbose && (_inserts > 0)) { |
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333 if (WizardMode) { |
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334 for (uint i=0; i<_max; i++) { |
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335 if (_table[i]) |
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336 tty->print("%d/%d/%d ",i,_table[i]->hash()&(_max-1),_table[i]->_idx); |
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337 } |
0 | 338 } |
339 tty->print("\nGVN Hash stats: %d grows to %d max_size\n", _grows, _max); | |
340 tty->print(" %d/%d (%8.1f%% full)\n", _inserts, _max, (double)_inserts/_max*100.0); | |
341 tty->print(" %dp/(%dh+%dm) (%8.2f probes/lookup)\n", _look_probes, _lookup_hits, _lookup_misses, (double)_look_probes/(_lookup_hits+_lookup_misses)); | |
342 tty->print(" %dp/%di (%8.2f probes/insert)\n", _total_insert_probes, _total_inserts, (double)_total_insert_probes/_total_inserts); | |
343 // sentinels increase lookup cost, but not insert cost | |
344 assert((_lookup_misses+_lookup_hits)*4+100 >= _look_probes, "bad hash function"); | |
345 assert( _inserts+(_inserts>>3) < _max, "table too full" ); | |
346 assert( _inserts*3+100 >= _insert_probes, "bad hash function" ); | |
347 } | |
348 } | |
349 | |
350 Node *NodeHash::find_index(uint idx) { // For debugging | |
351 // Find an entry by its index value | |
352 for( uint i = 0; i < _max; i++ ) { | |
353 Node *m = _table[i]; | |
354 if( !m || m == _sentinel ) continue; | |
355 if( m->_idx == (uint)idx ) return m; | |
356 } | |
357 return NULL; | |
358 } | |
359 #endif | |
360 | |
361 #ifdef ASSERT | |
362 NodeHash::~NodeHash() { | |
363 // Unlock all nodes upon destruction of table. | |
364 if (_table != (Node**)badAddress) clear(); | |
365 } | |
366 | |
367 void NodeHash::operator=(const NodeHash& nh) { | |
368 // Unlock all nodes upon replacement of table. | |
369 if (&nh == this) return; | |
370 if (_table != (Node**)badAddress) clear(); | |
371 memcpy(this, &nh, sizeof(*this)); | |
372 // Do not increment hash_lock counts again. | |
373 // Instead, be sure we never again use the source table. | |
374 ((NodeHash*)&nh)->_table = (Node**)badAddress; | |
375 } | |
376 | |
377 | |
378 #endif | |
379 | |
380 | |
381 //============================================================================= | |
382 //------------------------------PhaseRemoveUseless----------------------------- | |
383 // 1) Use a breadthfirst walk to collect useful nodes reachable from root. | |
384 PhaseRemoveUseless::PhaseRemoveUseless( PhaseGVN *gvn, Unique_Node_List *worklist ) : Phase(Remove_Useless), | |
385 _useful(Thread::current()->resource_area()) { | |
386 | |
387 // Implementation requires 'UseLoopSafepoints == true' and an edge from root | |
388 // to each SafePointNode at a backward branch. Inserted in add_safepoint(). | |
389 if( !UseLoopSafepoints || !OptoRemoveUseless ) return; | |
390 | |
391 // Identify nodes that are reachable from below, useful. | |
392 C->identify_useful_nodes(_useful); | |
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393 // Update dead node list |
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394 C->update_dead_node_list(_useful); |
0 | 395 |
396 // Remove all useless nodes from PhaseValues' recorded types | |
397 // Must be done before disconnecting nodes to preserve hash-table-invariant | |
398 gvn->remove_useless_nodes(_useful.member_set()); | |
399 | |
400 // Remove all useless nodes from future worklist | |
401 worklist->remove_useless_nodes(_useful.member_set()); | |
402 | |
403 // Disconnect 'useless' nodes that are adjacent to useful nodes | |
404 C->remove_useless_nodes(_useful); | |
405 | |
406 // Remove edges from "root" to each SafePoint at a backward branch. | |
407 // They were inserted during parsing (see add_safepoint()) to make infinite | |
408 // loops without calls or exceptions visible to root, i.e., useful. | |
409 Node *root = C->root(); | |
410 if( root != NULL ) { | |
411 for( uint i = root->req(); i < root->len(); ++i ) { | |
412 Node *n = root->in(i); | |
413 if( n != NULL && n->is_SafePoint() ) { | |
414 root->rm_prec(i); | |
415 --i; | |
416 } | |
417 } | |
418 } | |
419 } | |
420 | |
421 | |
422 //============================================================================= | |
423 //------------------------------PhaseTransform--------------------------------- | |
424 PhaseTransform::PhaseTransform( PhaseNumber pnum ) : Phase(pnum), | |
425 _arena(Thread::current()->resource_area()), | |
426 _nodes(_arena), | |
427 _types(_arena) | |
428 { | |
429 init_con_caches(); | |
430 #ifndef PRODUCT | |
431 clear_progress(); | |
432 clear_transforms(); | |
433 set_allow_progress(true); | |
434 #endif | |
435 // Force allocation for currently existing nodes | |
436 _types.map(C->unique(), NULL); | |
437 } | |
438 | |
439 //------------------------------PhaseTransform--------------------------------- | |
440 PhaseTransform::PhaseTransform( Arena *arena, PhaseNumber pnum ) : Phase(pnum), | |
441 _arena(arena), | |
442 _nodes(arena), | |
443 _types(arena) | |
444 { | |
445 init_con_caches(); | |
446 #ifndef PRODUCT | |
447 clear_progress(); | |
448 clear_transforms(); | |
449 set_allow_progress(true); | |
450 #endif | |
451 // Force allocation for currently existing nodes | |
452 _types.map(C->unique(), NULL); | |
453 } | |
454 | |
455 //------------------------------PhaseTransform--------------------------------- | |
456 // Initialize with previously generated type information | |
457 PhaseTransform::PhaseTransform( PhaseTransform *pt, PhaseNumber pnum ) : Phase(pnum), | |
458 _arena(pt->_arena), | |
459 _nodes(pt->_nodes), | |
460 _types(pt->_types) | |
461 { | |
462 init_con_caches(); | |
463 #ifndef PRODUCT | |
464 clear_progress(); | |
465 clear_transforms(); | |
466 set_allow_progress(true); | |
467 #endif | |
468 } | |
469 | |
470 void PhaseTransform::init_con_caches() { | |
471 memset(_icons,0,sizeof(_icons)); | |
472 memset(_lcons,0,sizeof(_lcons)); | |
473 memset(_zcons,0,sizeof(_zcons)); | |
474 } | |
475 | |
476 | |
477 //--------------------------------find_int_type-------------------------------- | |
478 const TypeInt* PhaseTransform::find_int_type(Node* n) { | |
479 if (n == NULL) return NULL; | |
480 // Call type_or_null(n) to determine node's type since we might be in | |
481 // parse phase and call n->Value() may return wrong type. | |
482 // (For example, a phi node at the beginning of loop parsing is not ready.) | |
483 const Type* t = type_or_null(n); | |
484 if (t == NULL) return NULL; | |
485 return t->isa_int(); | |
486 } | |
487 | |
488 | |
489 //-------------------------------find_long_type-------------------------------- | |
490 const TypeLong* PhaseTransform::find_long_type(Node* n) { | |
491 if (n == NULL) return NULL; | |
492 // (See comment above on type_or_null.) | |
493 const Type* t = type_or_null(n); | |
494 if (t == NULL) return NULL; | |
495 return t->isa_long(); | |
496 } | |
497 | |
498 | |
499 #ifndef PRODUCT | |
500 void PhaseTransform::dump_old2new_map() const { | |
501 _nodes.dump(); | |
502 } | |
503 | |
504 void PhaseTransform::dump_new( uint nidx ) const { | |
505 for( uint i=0; i<_nodes.Size(); i++ ) | |
506 if( _nodes[i] && _nodes[i]->_idx == nidx ) { | |
507 _nodes[i]->dump(); | |
508 tty->cr(); | |
509 tty->print_cr("Old index= %d",i); | |
510 return; | |
511 } | |
512 tty->print_cr("Node %d not found in the new indices", nidx); | |
513 } | |
514 | |
515 //------------------------------dump_types------------------------------------- | |
516 void PhaseTransform::dump_types( ) const { | |
517 _types.dump(); | |
518 } | |
519 | |
520 //------------------------------dump_nodes_and_types--------------------------- | |
521 void PhaseTransform::dump_nodes_and_types(const Node *root, uint depth, bool only_ctrl) { | |
522 VectorSet visited(Thread::current()->resource_area()); | |
523 dump_nodes_and_types_recur( root, depth, only_ctrl, visited ); | |
524 } | |
525 | |
526 //------------------------------dump_nodes_and_types_recur--------------------- | |
527 void PhaseTransform::dump_nodes_and_types_recur( const Node *n, uint depth, bool only_ctrl, VectorSet &visited) { | |
528 if( !n ) return; | |
529 if( depth == 0 ) return; | |
530 if( visited.test_set(n->_idx) ) return; | |
531 for( uint i=0; i<n->len(); i++ ) { | |
532 if( only_ctrl && !(n->is_Region()) && i != TypeFunc::Control ) continue; | |
533 dump_nodes_and_types_recur( n->in(i), depth-1, only_ctrl, visited ); | |
534 } | |
535 n->dump(); | |
536 if (type_or_null(n) != NULL) { | |
537 tty->print(" "); type(n)->dump(); tty->cr(); | |
538 } | |
539 } | |
540 | |
541 #endif | |
542 | |
543 | |
544 //============================================================================= | |
545 //------------------------------PhaseValues------------------------------------ | |
546 // Set minimum table size to "255" | |
547 PhaseValues::PhaseValues( Arena *arena, uint est_max_size ) : PhaseTransform(arena, GVN), _table(arena, est_max_size) { | |
548 NOT_PRODUCT( clear_new_values(); ) | |
549 } | |
550 | |
551 //------------------------------PhaseValues------------------------------------ | |
552 // Set minimum table size to "255" | |
553 PhaseValues::PhaseValues( PhaseValues *ptv ) : PhaseTransform( ptv, GVN ), | |
554 _table(&ptv->_table) { | |
555 NOT_PRODUCT( clear_new_values(); ) | |
556 } | |
557 | |
558 //------------------------------PhaseValues------------------------------------ | |
559 // Used by +VerifyOpto. Clear out hash table but copy _types array. | |
560 PhaseValues::PhaseValues( PhaseValues *ptv, const char *dummy ) : PhaseTransform( ptv, GVN ), | |
561 _table(ptv->arena(),ptv->_table.size()) { | |
562 NOT_PRODUCT( clear_new_values(); ) | |
563 } | |
564 | |
565 //------------------------------~PhaseValues----------------------------------- | |
566 #ifndef PRODUCT | |
567 PhaseValues::~PhaseValues() { | |
568 _table.dump(); | |
569 | |
570 // Statistics for value progress and efficiency | |
571 if( PrintCompilation && Verbose && WizardMode ) { | |
572 tty->print("\n%sValues: %d nodes ---> %d/%d (%d)", | |
573 is_IterGVN() ? "Iter" : " ", C->unique(), made_progress(), made_transforms(), made_new_values()); | |
574 if( made_transforms() != 0 ) { | |
575 tty->print_cr(" ratio %f", made_progress()/(float)made_transforms() ); | |
576 } else { | |
577 tty->cr(); | |
578 } | |
579 } | |
580 } | |
581 #endif | |
582 | |
583 //------------------------------makecon---------------------------------------- | |
584 ConNode* PhaseTransform::makecon(const Type *t) { | |
585 assert(t->singleton(), "must be a constant"); | |
586 assert(!t->empty() || t == Type::TOP, "must not be vacuous range"); | |
587 switch (t->base()) { // fast paths | |
588 case Type::Half: | |
589 case Type::Top: return (ConNode*) C->top(); | |
590 case Type::Int: return intcon( t->is_int()->get_con() ); | |
591 case Type::Long: return longcon( t->is_long()->get_con() ); | |
592 } | |
593 if (t->is_zero_type()) | |
594 return zerocon(t->basic_type()); | |
595 return uncached_makecon(t); | |
596 } | |
597 | |
598 //--------------------------uncached_makecon----------------------------------- | |
599 // Make an idealized constant - one of ConINode, ConPNode, etc. | |
600 ConNode* PhaseValues::uncached_makecon(const Type *t) { | |
601 assert(t->singleton(), "must be a constant"); | |
602 ConNode* x = ConNode::make(C, t); | |
603 ConNode* k = (ConNode*)hash_find_insert(x); // Value numbering | |
604 if (k == NULL) { | |
605 set_type(x, t); // Missed, provide type mapping | |
606 GrowableArray<Node_Notes*>* nna = C->node_note_array(); | |
607 if (nna != NULL) { | |
608 Node_Notes* loc = C->locate_node_notes(nna, x->_idx, true); | |
609 loc->clear(); // do not put debug info on constants | |
610 } | |
611 } else { | |
612 x->destruct(); // Hit, destroy duplicate constant | |
613 x = k; // use existing constant | |
614 } | |
615 return x; | |
616 } | |
617 | |
618 //------------------------------intcon----------------------------------------- | |
619 // Fast integer constant. Same as "transform(new ConINode(TypeInt::make(i)))" | |
620 ConINode* PhaseTransform::intcon(int i) { | |
621 // Small integer? Check cache! Check that cached node is not dead | |
622 if (i >= _icon_min && i <= _icon_max) { | |
623 ConINode* icon = _icons[i-_icon_min]; | |
624 if (icon != NULL && icon->in(TypeFunc::Control) != NULL) | |
625 return icon; | |
626 } | |
627 ConINode* icon = (ConINode*) uncached_makecon(TypeInt::make(i)); | |
628 assert(icon->is_Con(), ""); | |
629 if (i >= _icon_min && i <= _icon_max) | |
630 _icons[i-_icon_min] = icon; // Cache small integers | |
631 return icon; | |
632 } | |
633 | |
634 //------------------------------longcon---------------------------------------- | |
635 // Fast long constant. | |
636 ConLNode* PhaseTransform::longcon(jlong l) { | |
637 // Small integer? Check cache! Check that cached node is not dead | |
638 if (l >= _lcon_min && l <= _lcon_max) { | |
639 ConLNode* lcon = _lcons[l-_lcon_min]; | |
640 if (lcon != NULL && lcon->in(TypeFunc::Control) != NULL) | |
641 return lcon; | |
642 } | |
643 ConLNode* lcon = (ConLNode*) uncached_makecon(TypeLong::make(l)); | |
644 assert(lcon->is_Con(), ""); | |
645 if (l >= _lcon_min && l <= _lcon_max) | |
646 _lcons[l-_lcon_min] = lcon; // Cache small integers | |
647 return lcon; | |
648 } | |
649 | |
650 //------------------------------zerocon----------------------------------------- | |
651 // Fast zero or null constant. Same as "transform(ConNode::make(Type::get_zero_type(bt)))" | |
652 ConNode* PhaseTransform::zerocon(BasicType bt) { | |
653 assert((uint)bt <= _zcon_max, "domain check"); | |
654 ConNode* zcon = _zcons[bt]; | |
655 if (zcon != NULL && zcon->in(TypeFunc::Control) != NULL) | |
656 return zcon; | |
657 zcon = (ConNode*) uncached_makecon(Type::get_zero_type(bt)); | |
658 _zcons[bt] = zcon; | |
659 return zcon; | |
660 } | |
661 | |
662 | |
663 | |
664 //============================================================================= | |
665 //------------------------------transform-------------------------------------- | |
666 // Return a node which computes the same function as this node, but in a | |
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667 // faster or cheaper fashion. |
0 | 668 Node *PhaseGVN::transform( Node *n ) { |
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669 return transform_no_reclaim(n); |
0 | 670 } |
671 | |
672 //------------------------------transform-------------------------------------- | |
673 // Return a node which computes the same function as this node, but | |
674 // in a faster or cheaper fashion. | |
675 Node *PhaseGVN::transform_no_reclaim( Node *n ) { | |
676 NOT_PRODUCT( set_transforms(); ) | |
677 | |
678 // Apply the Ideal call in a loop until it no longer applies | |
679 Node *k = n; | |
680 NOT_PRODUCT( uint loop_count = 0; ) | |
681 while( 1 ) { | |
682 Node *i = k->Ideal(this, /*can_reshape=*/false); | |
683 if( !i ) break; | |
684 assert( i->_idx >= k->_idx, "Idealize should return new nodes, use Identity to return old nodes" ); | |
685 k = i; | |
686 assert(loop_count++ < K, "infinite loop in PhaseGVN::transform"); | |
687 } | |
688 NOT_PRODUCT( if( loop_count != 0 ) { set_progress(); } ) | |
689 | |
690 | |
691 // If brand new node, make space in type array. | |
692 ensure_type_or_null(k); | |
693 | |
694 // Since I just called 'Value' to compute the set of run-time values | |
695 // for this Node, and 'Value' is non-local (and therefore expensive) I'll | |
696 // cache Value. Later requests for the local phase->type of this Node can | |
697 // use the cached Value instead of suffering with 'bottom_type'. | |
698 const Type *t = k->Value(this); // Get runtime Value set | |
699 assert(t != NULL, "value sanity"); | |
700 if (type_or_null(k) != t) { | |
701 #ifndef PRODUCT | |
702 // Do not count initial visit to node as a transformation | |
703 if (type_or_null(k) == NULL) { | |
704 inc_new_values(); | |
705 set_progress(); | |
706 } | |
707 #endif | |
708 set_type(k, t); | |
709 // If k is a TypeNode, capture any more-precise type permanently into Node | |
710 k->raise_bottom_type(t); | |
711 } | |
712 | |
713 if( t->singleton() && !k->is_Con() ) { | |
714 NOT_PRODUCT( set_progress(); ) | |
715 return makecon(t); // Turn into a constant | |
716 } | |
717 | |
718 // Now check for Identities | |
719 Node *i = k->Identity(this); // Look for a nearby replacement | |
720 if( i != k ) { // Found? Return replacement! | |
721 NOT_PRODUCT( set_progress(); ) | |
722 return i; | |
723 } | |
724 | |
725 // Global Value Numbering | |
726 i = hash_find_insert(k); // Insert if new | |
727 if( i && (i != k) ) { | |
728 // Return the pre-existing node | |
729 NOT_PRODUCT( set_progress(); ) | |
730 return i; | |
731 } | |
732 | |
733 // Return Idealized original | |
734 return k; | |
735 } | |
736 | |
737 #ifdef ASSERT | |
738 //------------------------------dead_loop_check-------------------------------- | |
605 | 739 // Check for a simple dead loop when a data node references itself directly |
0 | 740 // or through an other data node excluding cons and phis. |
741 void PhaseGVN::dead_loop_check( Node *n ) { | |
742 // Phi may reference itself in a loop | |
743 if (n != NULL && !n->is_dead_loop_safe() && !n->is_CFG()) { | |
744 // Do 2 levels check and only data inputs. | |
745 bool no_dead_loop = true; | |
746 uint cnt = n->req(); | |
747 for (uint i = 1; i < cnt && no_dead_loop; i++) { | |
748 Node *in = n->in(i); | |
749 if (in == n) { | |
750 no_dead_loop = false; | |
751 } else if (in != NULL && !in->is_dead_loop_safe()) { | |
752 uint icnt = in->req(); | |
753 for (uint j = 1; j < icnt && no_dead_loop; j++) { | |
754 if (in->in(j) == n || in->in(j) == in) | |
755 no_dead_loop = false; | |
756 } | |
757 } | |
758 } | |
759 if (!no_dead_loop) n->dump(3); | |
760 assert(no_dead_loop, "dead loop detected"); | |
761 } | |
762 } | |
763 #endif | |
764 | |
765 //============================================================================= | |
766 //------------------------------PhaseIterGVN----------------------------------- | |
767 // Initialize hash table to fresh and clean for +VerifyOpto | |
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768 PhaseIterGVN::PhaseIterGVN( PhaseIterGVN *igvn, const char *dummy ) : PhaseGVN(igvn,dummy), _worklist( ), |
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769 _stack(C->unique() >> 1), |
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770 _delay_transform(false) { |
0 | 771 } |
772 | |
773 //------------------------------PhaseIterGVN----------------------------------- | |
774 // Initialize with previous PhaseIterGVN info; used by PhaseCCP | |
775 PhaseIterGVN::PhaseIterGVN( PhaseIterGVN *igvn ) : PhaseGVN(igvn), | |
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776 _worklist( igvn->_worklist ), |
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777 _stack( igvn->_stack ), |
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778 _delay_transform(igvn->_delay_transform) |
0 | 779 { |
780 } | |
781 | |
782 //------------------------------PhaseIterGVN----------------------------------- | |
783 // Initialize with previous PhaseGVN info from Parser | |
784 PhaseIterGVN::PhaseIterGVN( PhaseGVN *gvn ) : PhaseGVN(gvn), | |
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785 _worklist(*C->for_igvn()), |
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786 _stack(C->unique() >> 1), |
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787 _delay_transform(false) |
0 | 788 { |
789 uint max; | |
790 | |
791 // Dead nodes in the hash table inherited from GVN were not treated as | |
792 // roots during def-use info creation; hence they represent an invisible | |
793 // use. Clear them out. | |
794 max = _table.size(); | |
795 for( uint i = 0; i < max; ++i ) { | |
796 Node *n = _table.at(i); | |
797 if(n != NULL && n != _table.sentinel() && n->outcnt() == 0) { | |
798 if( n->is_top() ) continue; | |
799 assert( false, "Parse::remove_useless_nodes missed this node"); | |
800 hash_delete(n); | |
801 } | |
802 } | |
803 | |
804 // Any Phis or Regions on the worklist probably had uses that could not | |
805 // make more progress because the uses were made while the Phis and Regions | |
806 // were in half-built states. Put all uses of Phis and Regions on worklist. | |
807 max = _worklist.size(); | |
808 for( uint j = 0; j < max; j++ ) { | |
809 Node *n = _worklist.at(j); | |
810 uint uop = n->Opcode(); | |
811 if( uop == Op_Phi || uop == Op_Region || | |
812 n->is_Type() || | |
813 n->is_Mem() ) | |
814 add_users_to_worklist(n); | |
815 } | |
816 } | |
817 | |
818 | |
819 #ifndef PRODUCT | |
820 void PhaseIterGVN::verify_step(Node* n) { | |
821 _verify_window[_verify_counter % _verify_window_size] = n; | |
822 ++_verify_counter; | |
823 ResourceMark rm; | |
824 ResourceArea *area = Thread::current()->resource_area(); | |
825 VectorSet old_space(area), new_space(area); | |
826 if (C->unique() < 1000 || | |
827 0 == _verify_counter % (C->unique() < 10000 ? 10 : 100)) { | |
828 ++_verify_full_passes; | |
829 Node::verify_recur(C->root(), -1, old_space, new_space); | |
830 } | |
831 const int verify_depth = 4; | |
832 for ( int i = 0; i < _verify_window_size; i++ ) { | |
833 Node* n = _verify_window[i]; | |
834 if ( n == NULL ) continue; | |
835 if( n->in(0) == NodeSentinel ) { // xform_idom | |
836 _verify_window[i] = n->in(1); | |
837 --i; continue; | |
838 } | |
839 // Typical fanout is 1-2, so this call visits about 6 nodes. | |
840 Node::verify_recur(n, verify_depth, old_space, new_space); | |
841 } | |
842 } | |
843 #endif | |
844 | |
845 | |
846 //------------------------------init_worklist---------------------------------- | |
847 // Initialize worklist for each node. | |
848 void PhaseIterGVN::init_worklist( Node *n ) { | |
849 if( _worklist.member(n) ) return; | |
850 _worklist.push(n); | |
851 uint cnt = n->req(); | |
852 for( uint i =0 ; i < cnt; i++ ) { | |
853 Node *m = n->in(i); | |
854 if( m ) init_worklist(m); | |
855 } | |
856 } | |
857 | |
858 //------------------------------optimize--------------------------------------- | |
859 void PhaseIterGVN::optimize() { | |
860 debug_only(uint num_processed = 0;); | |
861 #ifndef PRODUCT | |
862 { | |
863 _verify_counter = 0; | |
864 _verify_full_passes = 0; | |
865 for ( int i = 0; i < _verify_window_size; i++ ) { | |
866 _verify_window[i] = NULL; | |
867 } | |
868 } | |
869 #endif | |
870 | |
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871 #ifdef ASSERT |
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872 Node* prev = NULL; |
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873 uint rep_cnt = 0; |
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874 #endif |
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875 uint loop_count = 0; |
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876 |
0 | 877 // Pull from worklist; transform node; |
878 // If node has changed: update edge info and put uses on worklist. | |
879 while( _worklist.size() ) { | |
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880 if (C->check_node_count(NodeLimitFudgeFactor * 2, |
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881 "out of nodes optimizing method")) { |
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882 return; |
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883 } |
0 | 884 Node *n = _worklist.pop(); |
10278 | 885 if (++loop_count >= K * C->live_nodes()) { |
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886 debug_only(n->dump(4);) |
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887 assert(false, "infinite loop in PhaseIterGVN::optimize"); |
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888 C->record_method_not_compilable("infinite loop in PhaseIterGVN::optimize"); |
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889 return; |
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890 } |
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891 #ifdef ASSERT |
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892 if (n == prev) { |
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893 if (++rep_cnt > 3) { |
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894 n->dump(4); |
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895 assert(false, "loop in Ideal transformation"); |
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896 } |
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897 } else { |
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898 rep_cnt = 0; |
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899 } |
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900 prev = n; |
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901 #endif |
0 | 902 if (TraceIterativeGVN && Verbose) { |
903 tty->print(" Pop "); | |
904 NOT_PRODUCT( n->dump(); ) | |
905 debug_only(if( (num_processed++ % 100) == 0 ) _worklist.print_set();) | |
906 } | |
907 | |
908 if (n->outcnt() != 0) { | |
909 | |
910 #ifndef PRODUCT | |
911 uint wlsize = _worklist.size(); | |
912 const Type* oldtype = type_or_null(n); | |
913 #endif //PRODUCT | |
914 | |
915 Node *nn = transform_old(n); | |
916 | |
917 #ifndef PRODUCT | |
918 if (TraceIterativeGVN) { | |
919 const Type* newtype = type_or_null(n); | |
920 if (nn != n) { | |
921 // print old node | |
922 tty->print("< "); | |
923 if (oldtype != newtype && oldtype != NULL) { | |
924 oldtype->dump(); | |
925 } | |
926 do { tty->print("\t"); } while (tty->position() < 16); | |
927 tty->print("<"); | |
928 n->dump(); | |
929 } | |
930 if (oldtype != newtype || nn != n) { | |
931 // print new node and/or new type | |
932 if (oldtype == NULL) { | |
933 tty->print("* "); | |
934 } else if (nn != n) { | |
935 tty->print("> "); | |
936 } else { | |
937 tty->print("= "); | |
938 } | |
939 if (newtype == NULL) { | |
940 tty->print("null"); | |
941 } else { | |
942 newtype->dump(); | |
943 } | |
944 do { tty->print("\t"); } while (tty->position() < 16); | |
945 nn->dump(); | |
946 } | |
947 if (Verbose && wlsize < _worklist.size()) { | |
948 tty->print(" Push {"); | |
949 while (wlsize != _worklist.size()) { | |
950 Node* pushed = _worklist.at(wlsize++); | |
951 tty->print(" %d", pushed->_idx); | |
952 } | |
953 tty->print_cr(" }"); | |
954 } | |
955 } | |
956 if( VerifyIterativeGVN && nn != n ) { | |
957 verify_step((Node*) NULL); // ignore n, it might be subsumed | |
958 } | |
959 #endif | |
960 } else if (!n->is_top()) { | |
961 remove_dead_node(n); | |
962 } | |
963 } | |
964 | |
965 #ifndef PRODUCT | |
966 C->verify_graph_edges(); | |
967 if( VerifyOpto && allow_progress() ) { | |
968 // Must turn off allow_progress to enable assert and break recursion | |
969 C->root()->verify(); | |
970 { // Check if any progress was missed using IterGVN | |
971 // Def-Use info enables transformations not attempted in wash-pass | |
972 // e.g. Region/Phi cleanup, ... | |
973 // Null-check elision -- may not have reached fixpoint | |
974 // do not propagate to dominated nodes | |
975 ResourceMark rm; | |
976 PhaseIterGVN igvn2(this,"Verify"); // Fresh and clean! | |
977 // Fill worklist completely | |
978 igvn2.init_worklist(C->root()); | |
979 | |
980 igvn2.set_allow_progress(false); | |
981 igvn2.optimize(); | |
982 igvn2.set_allow_progress(true); | |
983 } | |
984 } | |
985 if ( VerifyIterativeGVN && PrintOpto ) { | |
986 if ( _verify_counter == _verify_full_passes ) | |
987 tty->print_cr("VerifyIterativeGVN: %d transforms and verify passes", | |
988 _verify_full_passes); | |
989 else | |
990 tty->print_cr("VerifyIterativeGVN: %d transforms, %d full verify passes", | |
991 _verify_counter, _verify_full_passes); | |
992 } | |
993 #endif | |
994 } | |
995 | |
996 | |
997 //------------------register_new_node_with_optimizer--------------------------- | |
998 // Register a new node with the optimizer. Update the types array, the def-use | |
999 // info. Put on worklist. | |
1000 Node* PhaseIterGVN::register_new_node_with_optimizer(Node* n, Node* orig) { | |
1001 set_type_bottom(n); | |
1002 _worklist.push(n); | |
1003 if (orig != NULL) C->copy_node_notes_to(n, orig); | |
1004 return n; | |
1005 } | |
1006 | |
1007 //------------------------------transform-------------------------------------- | |
1008 // Non-recursive: idealize Node 'n' with respect to its inputs and its value | |
1009 Node *PhaseIterGVN::transform( Node *n ) { | |
113
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1010 if (_delay_transform) { |
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1011 // Register the node but don't optimize for now |
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1012 register_new_node_with_optimizer(n); |
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1013 return n; |
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1014 } |
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1015 |
0 | 1016 // If brand new node, make space in type array, and give it a type. |
1017 ensure_type_or_null(n); | |
1018 if (type_or_null(n) == NULL) { | |
1019 set_type_bottom(n); | |
1020 } | |
1021 | |
1022 return transform_old(n); | |
1023 } | |
1024 | |
1025 //------------------------------transform_old---------------------------------- | |
1026 Node *PhaseIterGVN::transform_old( Node *n ) { | |
1027 #ifndef PRODUCT | |
1028 debug_only(uint loop_count = 0;); | |
1029 set_transforms(); | |
1030 #endif | |
1031 // Remove 'n' from hash table in case it gets modified | |
1032 _table.hash_delete(n); | |
1033 if( VerifyIterativeGVN ) { | |
1034 assert( !_table.find_index(n->_idx), "found duplicate entry in table"); | |
1035 } | |
1036 | |
1037 // Apply the Ideal call in a loop until it no longer applies | |
1038 Node *k = n; | |
1039 DEBUG_ONLY(dead_loop_check(k);) | |
305 | 1040 DEBUG_ONLY(bool is_new = (k->outcnt() == 0);) |
0 | 1041 Node *i = k->Ideal(this, /*can_reshape=*/true); |
305 | 1042 assert(i != k || is_new || i->outcnt() > 0, "don't return dead nodes"); |
0 | 1043 #ifndef PRODUCT |
1044 if( VerifyIterativeGVN ) | |
1045 verify_step(k); | |
1046 if( i && VerifyOpto ) { | |
1047 if( !allow_progress() ) { | |
1048 if (i->is_Add() && i->outcnt() == 1) { | |
1049 // Switched input to left side because this is the only use | |
1050 } else if( i->is_If() && (i->in(0) == NULL) ) { | |
1051 // This IF is dead because it is dominated by an equivalent IF When | |
1052 // dominating if changed, info is not propagated sparsely to 'this' | |
1053 // Propagating this info further will spuriously identify other | |
1054 // progress. | |
1055 return i; | |
1056 } else | |
1057 set_progress(); | |
1058 } else | |
1059 set_progress(); | |
1060 } | |
1061 #endif | |
1062 | |
1063 while( i ) { | |
1064 #ifndef PRODUCT | |
1065 debug_only( if( loop_count >= K ) i->dump(4); ) | |
1066 assert(loop_count < K, "infinite loop in PhaseIterGVN::transform"); | |
1067 debug_only( loop_count++; ) | |
1068 #endif | |
1069 assert((i->_idx >= k->_idx) || i->is_top(), "Idealize should return new nodes, use Identity to return old nodes"); | |
1070 // Made a change; put users of original Node on worklist | |
1071 add_users_to_worklist( k ); | |
1072 // Replacing root of transform tree? | |
1073 if( k != i ) { | |
1074 // Make users of old Node now use new. | |
1075 subsume_node( k, i ); | |
1076 k = i; | |
1077 } | |
1078 DEBUG_ONLY(dead_loop_check(k);) | |
1079 // Try idealizing again | |
305 | 1080 DEBUG_ONLY(is_new = (k->outcnt() == 0);) |
0 | 1081 i = k->Ideal(this, /*can_reshape=*/true); |
305 | 1082 assert(i != k || is_new || i->outcnt() > 0, "don't return dead nodes"); |
0 | 1083 #ifndef PRODUCT |
1084 if( VerifyIterativeGVN ) | |
1085 verify_step(k); | |
1086 if( i && VerifyOpto ) set_progress(); | |
1087 #endif | |
1088 } | |
1089 | |
1090 // If brand new node, make space in type array. | |
1091 ensure_type_or_null(k); | |
1092 | |
1093 // See what kind of values 'k' takes on at runtime | |
1094 const Type *t = k->Value(this); | |
1095 assert(t != NULL, "value sanity"); | |
1096 | |
1097 // Since I just called 'Value' to compute the set of run-time values | |
1098 // for this Node, and 'Value' is non-local (and therefore expensive) I'll | |
1099 // cache Value. Later requests for the local phase->type of this Node can | |
1100 // use the cached Value instead of suffering with 'bottom_type'. | |
1101 if (t != type_or_null(k)) { | |
1102 NOT_PRODUCT( set_progress(); ) | |
1103 NOT_PRODUCT( inc_new_values();) | |
1104 set_type(k, t); | |
1105 // If k is a TypeNode, capture any more-precise type permanently into Node | |
1106 k->raise_bottom_type(t); | |
1107 // Move users of node to worklist | |
1108 add_users_to_worklist( k ); | |
1109 } | |
1110 | |
1111 // If 'k' computes a constant, replace it with a constant | |
1112 if( t->singleton() && !k->is_Con() ) { | |
1113 NOT_PRODUCT( set_progress(); ) | |
1114 Node *con = makecon(t); // Make a constant | |
1115 add_users_to_worklist( k ); | |
1116 subsume_node( k, con ); // Everybody using k now uses con | |
1117 return con; | |
1118 } | |
1119 | |
1120 // Now check for Identities | |
1121 i = k->Identity(this); // Look for a nearby replacement | |
1122 if( i != k ) { // Found? Return replacement! | |
1123 NOT_PRODUCT( set_progress(); ) | |
1124 add_users_to_worklist( k ); | |
1125 subsume_node( k, i ); // Everybody using k now uses i | |
1126 return i; | |
1127 } | |
1128 | |
1129 // Global Value Numbering | |
1130 i = hash_find_insert(k); // Check for pre-existing node | |
1131 if( i && (i != k) ) { | |
1132 // Return the pre-existing node if it isn't dead | |
1133 NOT_PRODUCT( set_progress(); ) | |
1134 add_users_to_worklist( k ); | |
1135 subsume_node( k, i ); // Everybody using k now uses i | |
1136 return i; | |
1137 } | |
1138 | |
1139 // Return Idealized original | |
1140 return k; | |
1141 } | |
1142 | |
1143 //---------------------------------saturate------------------------------------ | |
1144 const Type* PhaseIterGVN::saturate(const Type* new_type, const Type* old_type, | |
1145 const Type* limit_type) const { | |
1146 return new_type->narrow(old_type); | |
1147 } | |
1148 | |
1149 //------------------------------remove_globally_dead_node---------------------- | |
1150 // Kill a globally dead Node. All uses are also globally dead and are | |
1151 // aggressively trimmed. | |
1152 void PhaseIterGVN::remove_globally_dead_node( Node *dead ) { | |
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1153 enum DeleteProgress { |
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1154 PROCESS_INPUTS, |
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1155 PROCESS_OUTPUTS |
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1156 }; |
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1157 assert(_stack.is_empty(), "not empty"); |
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1158 _stack.push(dead, PROCESS_INPUTS); |
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1159 |
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1160 while (_stack.is_nonempty()) { |
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1161 dead = _stack.node(); |
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1162 uint progress_state = _stack.index(); |
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1163 assert(dead != C->root(), "killing root, eh?"); |
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1164 assert(!dead->is_top(), "add check for top when pushing"); |
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1165 NOT_PRODUCT( set_progress(); ) |
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1166 if (progress_state == PROCESS_INPUTS) { |
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1167 // After following inputs, continue to outputs |
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1168 _stack.set_index(PROCESS_OUTPUTS); |
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1169 if (!dead->is_Con()) { // Don't kill cons but uses |
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1170 bool recurse = false; |
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1171 // Remove from hash table |
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1172 _table.hash_delete( dead ); |
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1173 // Smash all inputs to 'dead', isolating him completely |
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1174 for (uint i = 0; i < dead->req(); i++) { |
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1175 Node *in = dead->in(i); |
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1176 if (in != NULL && in != C->top()) { // Points to something? |
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1177 int nrep = dead->replace_edge(in, NULL); // Kill edges |
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1178 assert((nrep > 0), "sanity"); |
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1179 if (in->outcnt() == 0) { // Made input go dead? |
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1180 _stack.push(in, PROCESS_INPUTS); // Recursively remove |
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1181 recurse = true; |
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1182 } else if (in->outcnt() == 1 && |
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1183 in->has_special_unique_user()) { |
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1184 _worklist.push(in->unique_out()); |
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1185 } else if (in->outcnt() <= 2 && dead->is_Phi()) { |
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1186 if (in->Opcode() == Op_Region) { |
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1187 _worklist.push(in); |
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1188 } else if (in->is_Store()) { |
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1189 DUIterator_Fast imax, i = in->fast_outs(imax); |
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1190 _worklist.push(in->fast_out(i)); |
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1191 i++; |
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1192 if (in->outcnt() == 2) { |
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1193 _worklist.push(in->fast_out(i)); |
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1194 i++; |
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1195 } |
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1196 assert(!(i < imax), "sanity"); |
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1197 } |
0 | 1198 } |
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1199 if (ReduceFieldZeroing && dead->is_Load() && i == MemNode::Memory && |
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1200 in->is_Proj() && in->in(0) != NULL && in->in(0)->is_Initialize()) { |
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1201 // A Load that directly follows an InitializeNode is |
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1202 // going away. The Stores that follow are candidates |
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1203 // again to be captured by the InitializeNode. |
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1204 for (DUIterator_Fast jmax, j = in->fast_outs(jmax); j < jmax; j++) { |
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1205 Node *n = in->fast_out(j); |
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1206 if (n->is_Store()) { |
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1207 _worklist.push(n); |
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1208 } |
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1209 } |
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1210 } |
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1211 } // if (in != NULL && in != C->top()) |
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1212 } // for (uint i = 0; i < dead->req(); i++) |
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1213 if (recurse) { |
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1214 continue; |
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1215 } |
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1216 } // if (!dead->is_Con()) |
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1217 } // if (progress_state == PROCESS_INPUTS) |
0 | 1218 |
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1219 // Aggressively kill globally dead uses |
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1220 // (Rather than pushing all the outs at once, we push one at a time, |
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1221 // plus the parent to resume later, because of the indefinite number |
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1222 // of edge deletions per loop trip.) |
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1223 if (dead->outcnt() > 0) { |
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1224 // Recursively remove output edges |
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1225 _stack.push(dead->raw_out(0), PROCESS_INPUTS); |
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1226 } else { |
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1227 // Finished disconnecting all input and output edges. |
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1228 _stack.pop(); |
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1229 // Remove dead node from iterative worklist |
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1230 _worklist.remove(dead); |
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1231 // Constant node that has no out-edges and has only one in-edge from |
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1232 // root is usually dead. However, sometimes reshaping walk makes |
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1233 // it reachable by adding use edges. So, we will NOT count Con nodes |
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1234 // as dead to be conservative about the dead node count at any |
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1235 // given time. |
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1236 if (!dead->is_Con()) { |
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1237 C->record_dead_node(dead->_idx); |
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1238 } |
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1239 if (dead->is_macro()) { |
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1240 C->remove_macro_node(dead); |
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1241 } |
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1242 if (dead->is_expensive()) { |
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1243 C->remove_expensive_node(dead); |
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1244 } |
0 | 1245 } |
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1246 } // while (_stack.is_nonempty()) |
0 | 1247 } |
1248 | |
1249 //------------------------------subsume_node----------------------------------- | |
1250 // Remove users from node 'old' and add them to node 'nn'. | |
1251 void PhaseIterGVN::subsume_node( Node *old, Node *nn ) { | |
1252 assert( old != hash_find(old), "should already been removed" ); | |
1253 assert( old != C->top(), "cannot subsume top node"); | |
1254 // Copy debug or profile information to the new version: | |
1255 C->copy_node_notes_to(nn, old); | |
1256 // Move users of node 'old' to node 'nn' | |
1257 for (DUIterator_Last imin, i = old->last_outs(imin); i >= imin; ) { | |
1258 Node* use = old->last_out(i); // for each use... | |
1259 // use might need re-hashing (but it won't if it's a new node) | |
1260 bool is_in_table = _table.hash_delete( use ); | |
1261 // Update use-def info as well | |
1262 // We remove all occurrences of old within use->in, | |
1263 // so as to avoid rehashing any node more than once. | |
1264 // The hash table probe swamps any outer loop overhead. | |
1265 uint num_edges = 0; | |
1266 for (uint jmax = use->len(), j = 0; j < jmax; j++) { | |
1267 if (use->in(j) == old) { | |
1268 use->set_req(j, nn); | |
1269 ++num_edges; | |
1270 } | |
1271 } | |
1272 // Insert into GVN hash table if unique | |
1273 // If a duplicate, 'use' will be cleaned up when pulled off worklist | |
1274 if( is_in_table ) { | |
1275 hash_find_insert(use); | |
1276 } | |
1277 i -= num_edges; // we deleted 1 or more copies of this edge | |
1278 } | |
1279 | |
1280 // Smash all inputs to 'old', isolating him completely | |
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1281 Node *temp = new (C) Node(1); |
0 | 1282 temp->init_req(0,nn); // Add a use to nn to prevent him from dying |
1283 remove_dead_node( old ); | |
1284 temp->del_req(0); // Yank bogus edge | |
1285 #ifndef PRODUCT | |
1286 if( VerifyIterativeGVN ) { | |
1287 for ( int i = 0; i < _verify_window_size; i++ ) { | |
1288 if ( _verify_window[i] == old ) | |
1289 _verify_window[i] = nn; | |
1290 } | |
1291 } | |
1292 #endif | |
1293 _worklist.remove(temp); // this can be necessary | |
1294 temp->destruct(); // reuse the _idx of this little guy | |
1295 } | |
1296 | |
1297 //------------------------------add_users_to_worklist-------------------------- | |
1298 void PhaseIterGVN::add_users_to_worklist0( Node *n ) { | |
1299 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1300 _worklist.push(n->fast_out(i)); // Push on worklist | |
1301 } | |
1302 } | |
1303 | |
1304 void PhaseIterGVN::add_users_to_worklist( Node *n ) { | |
1305 add_users_to_worklist0(n); | |
1306 | |
1307 // Move users of node to worklist | |
1308 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1309 Node* use = n->fast_out(i); // Get use | |
1310 | |
1311 if( use->is_Multi() || // Multi-definer? Push projs on worklist | |
1312 use->is_Store() ) // Enable store/load same address | |
1313 add_users_to_worklist0(use); | |
1314 | |
1315 // If we changed the receiver type to a call, we need to revisit | |
1316 // the Catch following the call. It's looking for a non-NULL | |
1317 // receiver to know when to enable the regular fall-through path | |
1318 // in addition to the NullPtrException path. | |
1319 if (use->is_CallDynamicJava() && n == use->in(TypeFunc::Parms)) { | |
1320 Node* p = use->as_CallDynamicJava()->proj_out(TypeFunc::Control); | |
1321 if (p != NULL) { | |
1322 add_users_to_worklist0(p); | |
1323 } | |
1324 } | |
1325 | |
1326 if( use->is_Cmp() ) { // Enable CMP/BOOL optimization | |
1327 add_users_to_worklist(use); // Put Bool on worklist | |
1328 // Look for the 'is_x2logic' pattern: "x ? : 0 : 1" and put the | |
1329 // phi merging either 0 or 1 onto the worklist | |
1330 if (use->outcnt() > 0) { | |
1331 Node* bol = use->raw_out(0); | |
1332 if (bol->outcnt() > 0) { | |
1333 Node* iff = bol->raw_out(0); | |
1334 if (iff->outcnt() == 2) { | |
1335 Node* ifproj0 = iff->raw_out(0); | |
1336 Node* ifproj1 = iff->raw_out(1); | |
1337 if (ifproj0->outcnt() > 0 && ifproj1->outcnt() > 0) { | |
1338 Node* region0 = ifproj0->raw_out(0); | |
1339 Node* region1 = ifproj1->raw_out(0); | |
1340 if( region0 == region1 ) | |
1341 add_users_to_worklist0(region0); | |
1342 } | |
1343 } | |
1344 } | |
1345 } | |
1346 } | |
1347 | |
1348 uint use_op = use->Opcode(); | |
1349 // If changed Cast input, check Phi users for simple cycles | |
65 | 1350 if( use->is_ConstraintCast() || use->is_CheckCastPP() ) { |
0 | 1351 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { |
1352 Node* u = use->fast_out(i2); | |
1353 if (u->is_Phi()) | |
1354 _worklist.push(u); | |
1355 } | |
1356 } | |
1357 // If changed LShift inputs, check RShift users for useless sign-ext | |
1358 if( use_op == Op_LShiftI ) { | |
1359 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { | |
1360 Node* u = use->fast_out(i2); | |
1361 if (u->Opcode() == Op_RShiftI) | |
1362 _worklist.push(u); | |
1363 } | |
1364 } | |
1365 // If changed AddP inputs, check Stores for loop invariant | |
1366 if( use_op == Op_AddP ) { | |
1367 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { | |
1368 Node* u = use->fast_out(i2); | |
1369 if (u->is_Mem()) | |
1370 _worklist.push(u); | |
1371 } | |
1372 } | |
1373 // If changed initialization activity, check dependent Stores | |
1374 if (use_op == Op_Allocate || use_op == Op_AllocateArray) { | |
1375 InitializeNode* init = use->as_Allocate()->initialization(); | |
1376 if (init != NULL) { | |
1377 Node* imem = init->proj_out(TypeFunc::Memory); | |
1378 if (imem != NULL) add_users_to_worklist0(imem); | |
1379 } | |
1380 } | |
1381 if (use_op == Op_Initialize) { | |
1382 Node* imem = use->as_Initialize()->proj_out(TypeFunc::Memory); | |
1383 if (imem != NULL) add_users_to_worklist0(imem); | |
1384 } | |
1385 } | |
1386 } | |
1387 | |
12966 | 1388 /** |
1389 * Remove the speculative part of all types that we know of | |
1390 */ | |
1391 void PhaseIterGVN::remove_speculative_types() { | |
1392 assert(UseTypeSpeculation, "speculation is off"); | |
1393 for (uint i = 0; i < _types.Size(); i++) { | |
1394 const Type* t = _types.fast_lookup(i); | |
14909 | 1395 if (t != NULL && t->isa_oopptr()) { |
1396 const TypeOopPtr* to = t->is_oopptr(); | |
1397 _types.map(i, to->remove_speculative()); | |
12966 | 1398 } |
1399 } | |
1400 } | |
1401 | |
0 | 1402 //============================================================================= |
1403 #ifndef PRODUCT | |
1404 uint PhaseCCP::_total_invokes = 0; | |
1405 uint PhaseCCP::_total_constants = 0; | |
1406 #endif | |
1407 //------------------------------PhaseCCP--------------------------------------- | |
1408 // Conditional Constant Propagation, ala Wegman & Zadeck | |
1409 PhaseCCP::PhaseCCP( PhaseIterGVN *igvn ) : PhaseIterGVN(igvn) { | |
1410 NOT_PRODUCT( clear_constants(); ) | |
1411 assert( _worklist.size() == 0, "" ); | |
1412 // Clear out _nodes from IterGVN. Must be clear to transform call. | |
1413 _nodes.clear(); // Clear out from IterGVN | |
1414 analyze(); | |
1415 } | |
1416 | |
1417 #ifndef PRODUCT | |
1418 //------------------------------~PhaseCCP-------------------------------------- | |
1419 PhaseCCP::~PhaseCCP() { | |
1420 inc_invokes(); | |
1421 _total_constants += count_constants(); | |
1422 } | |
1423 #endif | |
1424 | |
1425 | |
1426 #ifdef ASSERT | |
1427 static bool ccp_type_widens(const Type* t, const Type* t0) { | |
1428 assert(t->meet(t0) == t, "Not monotonic"); | |
1429 switch (t->base() == t0->base() ? t->base() : Type::Top) { | |
1430 case Type::Int: | |
1431 assert(t0->isa_int()->_widen <= t->isa_int()->_widen, "widen increases"); | |
1432 break; | |
1433 case Type::Long: | |
1434 assert(t0->isa_long()->_widen <= t->isa_long()->_widen, "widen increases"); | |
1435 break; | |
1436 } | |
1437 return true; | |
1438 } | |
1439 #endif //ASSERT | |
1440 | |
1441 //------------------------------analyze---------------------------------------- | |
1442 void PhaseCCP::analyze() { | |
1443 // Initialize all types to TOP, optimistic analysis | |
1444 for (int i = C->unique() - 1; i >= 0; i--) { | |
1445 _types.map(i,Type::TOP); | |
1446 } | |
1447 | |
1448 // Push root onto worklist | |
1449 Unique_Node_List worklist; | |
1450 worklist.push(C->root()); | |
1451 | |
1452 // Pull from worklist; compute new value; push changes out. | |
1453 // This loop is the meat of CCP. | |
1454 while( worklist.size() ) { | |
1455 Node *n = worklist.pop(); | |
1456 const Type *t = n->Value(this); | |
1457 if (t != type(n)) { | |
1458 assert(ccp_type_widens(t, type(n)), "ccp type must widen"); | |
1459 #ifndef PRODUCT | |
1460 if( TracePhaseCCP ) { | |
1461 t->dump(); | |
1462 do { tty->print("\t"); } while (tty->position() < 16); | |
1463 n->dump(); | |
1464 } | |
1465 #endif | |
1466 set_type(n, t); | |
1467 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1468 Node* m = n->fast_out(i); // Get user | |
1469 if( m->is_Region() ) { // New path to Region? Must recheck Phis too | |
1470 for (DUIterator_Fast i2max, i2 = m->fast_outs(i2max); i2 < i2max; i2++) { | |
1471 Node* p = m->fast_out(i2); // Propagate changes to uses | |
1472 if( p->bottom_type() != type(p) ) // If not already bottomed out | |
1473 worklist.push(p); // Propagate change to user | |
1474 } | |
1475 } | |
605 | 1476 // If we changed the receiver type to a call, we need to revisit |
0 | 1477 // the Catch following the call. It's looking for a non-NULL |
1478 // receiver to know when to enable the regular fall-through path | |
1479 // in addition to the NullPtrException path | |
1480 if (m->is_Call()) { | |
1481 for (DUIterator_Fast i2max, i2 = m->fast_outs(i2max); i2 < i2max; i2++) { | |
1482 Node* p = m->fast_out(i2); // Propagate changes to uses | |
1483 if (p->is_Proj() && p->as_Proj()->_con == TypeFunc::Control && p->outcnt() == 1) | |
1484 worklist.push(p->unique_out()); | |
1485 } | |
1486 } | |
1487 if( m->bottom_type() != type(m) ) // If not already bottomed out | |
1488 worklist.push(m); // Propagate change to user | |
1489 } | |
1490 } | |
1491 } | |
1492 } | |
1493 | |
1494 //------------------------------do_transform----------------------------------- | |
1495 // Top level driver for the recursive transformer | |
1496 void PhaseCCP::do_transform() { | |
1497 // Correct leaves of new-space Nodes; they point to old-space. | |
1498 C->set_root( transform(C->root())->as_Root() ); | |
1499 assert( C->top(), "missing TOP node" ); | |
1500 assert( C->root(), "missing root" ); | |
1501 } | |
1502 | |
1503 //------------------------------transform-------------------------------------- | |
1504 // Given a Node in old-space, clone him into new-space. | |
1505 // Convert any of his old-space children into new-space children. | |
1506 Node *PhaseCCP::transform( Node *n ) { | |
1507 Node *new_node = _nodes[n->_idx]; // Check for transformed node | |
1508 if( new_node != NULL ) | |
1509 return new_node; // Been there, done that, return old answer | |
1510 new_node = transform_once(n); // Check for constant | |
1511 _nodes.map( n->_idx, new_node ); // Flag as having been cloned | |
1512 | |
1513 // Allocate stack of size _nodes.Size()/2 to avoid frequent realloc | |
1514 GrowableArray <Node *> trstack(C->unique() >> 1); | |
1515 | |
1516 trstack.push(new_node); // Process children of cloned node | |
1517 while ( trstack.is_nonempty() ) { | |
1518 Node *clone = trstack.pop(); | |
1519 uint cnt = clone->req(); | |
1520 for( uint i = 0; i < cnt; i++ ) { // For all inputs do | |
1521 Node *input = clone->in(i); | |
1522 if( input != NULL ) { // Ignore NULLs | |
1523 Node *new_input = _nodes[input->_idx]; // Check for cloned input node | |
1524 if( new_input == NULL ) { | |
1525 new_input = transform_once(input); // Check for constant | |
1526 _nodes.map( input->_idx, new_input );// Flag as having been cloned | |
1527 trstack.push(new_input); | |
1528 } | |
1529 assert( new_input == clone->in(i), "insanity check"); | |
1530 } | |
1531 } | |
1532 } | |
1533 return new_node; | |
1534 } | |
1535 | |
1536 | |
1537 //------------------------------transform_once--------------------------------- | |
1538 // For PhaseCCP, transformation is IDENTITY unless Node computed a constant. | |
1539 Node *PhaseCCP::transform_once( Node *n ) { | |
1540 const Type *t = type(n); | |
1541 // Constant? Use constant Node instead | |
1542 if( t->singleton() ) { | |
1543 Node *nn = n; // Default is to return the original constant | |
1544 if( t == Type::TOP ) { | |
1545 // cache my top node on the Compile instance | |
1546 if( C->cached_top_node() == NULL || C->cached_top_node()->in(0) == NULL ) { | |
1547 C->set_cached_top_node( ConNode::make(C, Type::TOP) ); | |
1548 set_type(C->top(), Type::TOP); | |
1549 } | |
1550 nn = C->top(); | |
1551 } | |
1552 if( !n->is_Con() ) { | |
1553 if( t != Type::TOP ) { | |
1554 nn = makecon(t); // ConNode::make(t); | |
1555 NOT_PRODUCT( inc_constants(); ) | |
1556 } else if( n->is_Region() ) { // Unreachable region | |
1557 // Note: nn == C->top() | |
1558 n->set_req(0, NULL); // Cut selfreference | |
1559 // Eagerly remove dead phis to avoid phis copies creation. | |
1560 for (DUIterator i = n->outs(); n->has_out(i); i++) { | |
1561 Node* m = n->out(i); | |
1562 if( m->is_Phi() ) { | |
1563 assert(type(m) == Type::TOP, "Unreachable region should not have live phis."); | |
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1564 replace_node(m, nn); |
0 | 1565 --i; // deleted this phi; rescan starting with next position |
1566 } | |
1567 } | |
1568 } | |
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1569 replace_node(n,nn); // Update DefUse edges for new constant |
0 | 1570 } |
1571 return nn; | |
1572 } | |
1573 | |
1574 // If x is a TypeNode, capture any more-precise type permanently into Node | |
1575 if (t != n->bottom_type()) { | |
1576 hash_delete(n); // changing bottom type may force a rehash | |
1577 n->raise_bottom_type(t); | |
1578 _worklist.push(n); // n re-enters the hash table via the worklist | |
1579 } | |
1580 | |
1581 // Idealize graph using DU info. Must clone() into new-space. | |
1582 // DU info is generally used to show profitability, progress or safety | |
1583 // (but generally not needed for correctness). | |
1584 Node *nn = n->Ideal_DU_postCCP(this); | |
1585 | |
1586 // TEMPORARY fix to ensure that 2nd GVN pass eliminates NULL checks | |
1587 switch( n->Opcode() ) { | |
1588 case Op_FastLock: // Revisit FastLocks for lock coarsening | |
1589 case Op_If: | |
1590 case Op_CountedLoopEnd: | |
1591 case Op_Region: | |
1592 case Op_Loop: | |
1593 case Op_CountedLoop: | |
1594 case Op_Conv2B: | |
1595 case Op_Opaque1: | |
1596 case Op_Opaque2: | |
1597 _worklist.push(n); | |
1598 break; | |
1599 default: | |
1600 break; | |
1601 } | |
1602 if( nn ) { | |
1603 _worklist.push(n); | |
1604 // Put users of 'n' onto worklist for second igvn transform | |
1605 add_users_to_worklist(n); | |
1606 return nn; | |
1607 } | |
1608 | |
1609 return n; | |
1610 } | |
1611 | |
1612 //---------------------------------saturate------------------------------------ | |
1613 const Type* PhaseCCP::saturate(const Type* new_type, const Type* old_type, | |
1614 const Type* limit_type) const { | |
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1615 const Type* wide_type = new_type->widen(old_type, limit_type); |
0 | 1616 if (wide_type != new_type) { // did we widen? |
1617 // If so, we may have widened beyond the limit type. Clip it back down. | |
1618 new_type = wide_type->filter(limit_type); | |
1619 } | |
1620 return new_type; | |
1621 } | |
1622 | |
1623 //------------------------------print_statistics------------------------------- | |
1624 #ifndef PRODUCT | |
1625 void PhaseCCP::print_statistics() { | |
1626 tty->print_cr("CCP: %d constants found: %d", _total_invokes, _total_constants); | |
1627 } | |
1628 #endif | |
1629 | |
1630 | |
1631 //============================================================================= | |
1632 #ifndef PRODUCT | |
1633 uint PhasePeephole::_total_peepholes = 0; | |
1634 #endif | |
1635 //------------------------------PhasePeephole---------------------------------- | |
1636 // Conditional Constant Propagation, ala Wegman & Zadeck | |
1637 PhasePeephole::PhasePeephole( PhaseRegAlloc *regalloc, PhaseCFG &cfg ) | |
1638 : PhaseTransform(Peephole), _regalloc(regalloc), _cfg(cfg) { | |
1639 NOT_PRODUCT( clear_peepholes(); ) | |
1640 } | |
1641 | |
1642 #ifndef PRODUCT | |
1643 //------------------------------~PhasePeephole--------------------------------- | |
1644 PhasePeephole::~PhasePeephole() { | |
1645 _total_peepholes += count_peepholes(); | |
1646 } | |
1647 #endif | |
1648 | |
1649 //------------------------------transform-------------------------------------- | |
1650 Node *PhasePeephole::transform( Node *n ) { | |
1651 ShouldNotCallThis(); | |
1652 return NULL; | |
1653 } | |
1654 | |
1655 //------------------------------do_transform----------------------------------- | |
1656 void PhasePeephole::do_transform() { | |
1657 bool method_name_not_printed = true; | |
1658 | |
1659 // Examine each basic block | |
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1660 for (uint block_number = 1; block_number < _cfg.number_of_blocks(); ++block_number) { |
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1661 Block* block = _cfg.get_block(block_number); |
0 | 1662 bool block_not_printed = true; |
1663 | |
1664 // and each instruction within a block | |
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1665 uint end_index = block->number_of_nodes(); |
0 | 1666 // block->end_idx() not valid after PhaseRegAlloc |
1667 for( uint instruction_index = 1; instruction_index < end_index; ++instruction_index ) { | |
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1668 Node *n = block->get_node(instruction_index); |
0 | 1669 if( n->is_Mach() ) { |
1670 MachNode *m = n->as_Mach(); | |
1671 int deleted_count = 0; | |
1672 // check for peephole opportunities | |
1673 MachNode *m2 = m->peephole( block, instruction_index, _regalloc, deleted_count, C ); | |
1674 if( m2 != NULL ) { | |
1675 #ifndef PRODUCT | |
1676 if( PrintOptoPeephole ) { | |
1677 // Print method, first time only | |
1678 if( C->method() && method_name_not_printed ) { | |
1679 C->method()->print_short_name(); tty->cr(); | |
1680 method_name_not_printed = false; | |
1681 } | |
1682 // Print this block | |
1683 if( Verbose && block_not_printed) { | |
1684 tty->print_cr("in block"); | |
1685 block->dump(); | |
1686 block_not_printed = false; | |
1687 } | |
1688 // Print instructions being deleted | |
1689 for( int i = (deleted_count - 1); i >= 0; --i ) { | |
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1690 block->get_node(instruction_index-i)->as_Mach()->format(_regalloc); tty->cr(); |
0 | 1691 } |
1692 tty->print_cr("replaced with"); | |
1693 // Print new instruction | |
1694 m2->format(_regalloc); | |
1695 tty->print("\n\n"); | |
1696 } | |
1697 #endif | |
1698 // Remove old nodes from basic block and update instruction_index | |
1699 // (old nodes still exist and may have edges pointing to them | |
1700 // as register allocation info is stored in the allocator using | |
1701 // the node index to live range mappings.) | |
1702 uint safe_instruction_index = (instruction_index - deleted_count); | |
1703 for( ; (instruction_index > safe_instruction_index); --instruction_index ) { | |
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1704 block->remove_node( instruction_index ); |
0 | 1705 } |
1706 // install new node after safe_instruction_index | |
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1707 block->insert_node(m2, safe_instruction_index + 1); |
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1708 end_index = block->number_of_nodes() - 1; // Recompute new block size |
0 | 1709 NOT_PRODUCT( inc_peepholes(); ) |
1710 } | |
1711 } | |
1712 } | |
1713 } | |
1714 } | |
1715 | |
1716 //------------------------------print_statistics------------------------------- | |
1717 #ifndef PRODUCT | |
1718 void PhasePeephole::print_statistics() { | |
1719 tty->print_cr("Peephole: peephole rules applied: %d", _total_peepholes); | |
1720 } | |
1721 #endif | |
1722 | |
1723 | |
1724 //============================================================================= | |
1725 //------------------------------set_req_X-------------------------------------- | |
1726 void Node::set_req_X( uint i, Node *n, PhaseIterGVN *igvn ) { | |
1727 assert( is_not_dead(n), "can not use dead node"); | |
1728 assert( igvn->hash_find(this) != this, "Need to remove from hash before changing edges" ); | |
1729 Node *old = in(i); | |
1730 set_req(i, n); | |
1731 | |
1732 // old goes dead? | |
1733 if( old ) { | |
1734 switch (old->outcnt()) { | |
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1735 case 0: |
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1736 // Put into the worklist to kill later. We do not kill it now because the |
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1737 // recursive kill will delete the current node (this) if dead-loop exists |
0 | 1738 if (!old->is_top()) |
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1739 igvn->_worklist.push( old ); |
0 | 1740 break; |
1741 case 1: | |
1742 if( old->is_Store() || old->has_special_unique_user() ) | |
1743 igvn->add_users_to_worklist( old ); | |
1744 break; | |
1745 case 2: | |
1746 if( old->is_Store() ) | |
1747 igvn->add_users_to_worklist( old ); | |
1748 if( old->Opcode() == Op_Region ) | |
1749 igvn->_worklist.push(old); | |
1750 break; | |
1751 case 3: | |
1752 if( old->Opcode() == Op_Region ) { | |
1753 igvn->_worklist.push(old); | |
1754 igvn->add_users_to_worklist( old ); | |
1755 } | |
1756 break; | |
1757 default: | |
1758 break; | |
1759 } | |
1760 } | |
1761 | |
1762 } | |
1763 | |
1764 //-------------------------------replace_by----------------------------------- | |
1765 // Using def-use info, replace one node for another. Follow the def-use info | |
1766 // to all users of the OLD node. Then make all uses point to the NEW node. | |
1767 void Node::replace_by(Node *new_node) { | |
1768 assert(!is_top(), "top node has no DU info"); | |
1769 for (DUIterator_Last imin, i = last_outs(imin); i >= imin; ) { | |
1770 Node* use = last_out(i); | |
1771 uint uses_found = 0; | |
1772 for (uint j = 0; j < use->len(); j++) { | |
1773 if (use->in(j) == this) { | |
1774 if (j < use->req()) | |
1775 use->set_req(j, new_node); | |
1776 else use->set_prec(j, new_node); | |
1777 uses_found++; | |
1778 } | |
1779 } | |
1780 i -= uses_found; // we deleted 1 or more copies of this edge | |
1781 } | |
1782 } | |
1783 | |
1784 //============================================================================= | |
1785 //----------------------------------------------------------------------------- | |
1786 void Type_Array::grow( uint i ) { | |
1787 if( !_max ) { | |
1788 _max = 1; | |
1789 _types = (const Type**)_a->Amalloc( _max * sizeof(Type*) ); | |
1790 _types[0] = NULL; | |
1791 } | |
1792 uint old = _max; | |
1793 while( i >= _max ) _max <<= 1; // Double to fit | |
1794 _types = (const Type**)_a->Arealloc( _types, old*sizeof(Type*),_max*sizeof(Type*)); | |
1795 memset( &_types[old], 0, (_max-old)*sizeof(Type*) ); | |
1796 } | |
1797 | |
1798 //------------------------------dump------------------------------------------- | |
1799 #ifndef PRODUCT | |
1800 void Type_Array::dump() const { | |
1801 uint max = Size(); | |
1802 for( uint i = 0; i < max; i++ ) { | |
1803 if( _types[i] != NULL ) { | |
1804 tty->print(" %d\t== ", i); _types[i]->dump(); tty->cr(); | |
1805 } | |
1806 } | |
1807 } | |
1808 #endif |