Mercurial > hg > truffle
annotate src/share/vm/opto/phaseX.cpp @ 6027:8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
Summary: Removed the HeapRegion::_top_at_conc_mark_count field. It is no longer needed as a result of the changes for 6888336 and 7127706. Refactored the closures that finalize and verify the liveness counting data so that common functionality was placed into a base class.
Reviewed-by: brutisso, tonyp
author | johnc |
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date | Wed, 25 Apr 2012 10:23:12 -0700 |
parents | 670a74b863fc |
children | 611e8a669a2c |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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 | |
51 _sentinel = new (Compile::current(), 1) ProjNode(NULL, TypeFunc::Control); | |
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 | |
66 _sentinel = new (Compile::current(), 1) ProjNode(NULL, TypeFunc::Control); | |
67 memset(_table,0,sizeof(Node*)*_max); | |
68 } | |
69 | |
70 //------------------------------NodeHash--------------------------------------- | |
71 NodeHash::NodeHash(NodeHash *nh) { | |
72 debug_only(_table = (Node**)badAddress); // interact correctly w/ operator= | |
73 // just copy in all the fields | |
74 *this = *nh; | |
75 // nh->_sentinel must be in the current node space | |
76 } | |
77 | |
78 //------------------------------hash_find-------------------------------------- | |
79 // Find in hash table | |
80 Node *NodeHash::hash_find( const Node *n ) { | |
81 // ((Node*)n)->set_hash( n->hash() ); | |
82 uint hash = n->hash(); | |
83 if (hash == Node::NO_HASH) { | |
84 debug_only( _lookup_misses++ ); | |
85 return NULL; | |
86 } | |
87 uint key = hash & (_max-1); | |
88 uint stride = key | 0x01; | |
89 debug_only( _look_probes++ ); | |
90 Node *k = _table[key]; // Get hashed value | |
91 if( !k ) { // ?Miss? | |
92 debug_only( _lookup_misses++ ); | |
93 return NULL; // Miss! | |
94 } | |
95 | |
96 int op = n->Opcode(); | |
97 uint req = n->req(); | |
98 while( 1 ) { // While probing hash table | |
99 if( k->req() == req && // Same count of inputs | |
100 k->Opcode() == op ) { // Same Opcode | |
101 for( uint i=0; i<req; i++ ) | |
102 if( n->in(i)!=k->in(i)) // Different inputs? | |
103 goto collision; // "goto" is a speed hack... | |
104 if( n->cmp(*k) ) { // Check for any special bits | |
105 debug_only( _lookup_hits++ ); | |
106 return k; // Hit! | |
107 } | |
108 } | |
109 collision: | |
110 debug_only( _look_probes++ ); | |
111 key = (key + stride/*7*/) & (_max-1); // Stride through table with relative prime | |
112 k = _table[key]; // Get hashed value | |
113 if( !k ) { // ?Miss? | |
114 debug_only( _lookup_misses++ ); | |
115 return NULL; // Miss! | |
116 } | |
117 } | |
118 ShouldNotReachHere(); | |
119 return NULL; | |
120 } | |
121 | |
122 //------------------------------hash_find_insert------------------------------- | |
123 // Find in hash table, insert if not already present | |
124 // Used to preserve unique entries in hash table | |
125 Node *NodeHash::hash_find_insert( Node *n ) { | |
126 // n->set_hash( ); | |
127 uint hash = n->hash(); | |
128 if (hash == Node::NO_HASH) { | |
129 debug_only( _lookup_misses++ ); | |
130 return NULL; | |
131 } | |
132 uint key = hash & (_max-1); | |
133 uint stride = key | 0x01; // stride must be relatively prime to table siz | |
134 uint first_sentinel = 0; // replace a sentinel if seen. | |
135 debug_only( _look_probes++ ); | |
136 Node *k = _table[key]; // Get hashed value | |
137 if( !k ) { // ?Miss? | |
138 debug_only( _lookup_misses++ ); | |
139 _table[key] = n; // Insert into table! | |
140 debug_only(n->enter_hash_lock()); // Lock down the node while in the table. | |
141 check_grow(); // Grow table if insert hit limit | |
142 return NULL; // Miss! | |
143 } | |
144 else if( k == _sentinel ) { | |
145 first_sentinel = key; // Can insert here | |
146 } | |
147 | |
148 int op = n->Opcode(); | |
149 uint req = n->req(); | |
150 while( 1 ) { // While probing hash table | |
151 if( k->req() == req && // Same count of inputs | |
152 k->Opcode() == op ) { // Same Opcode | |
153 for( uint i=0; i<req; i++ ) | |
154 if( n->in(i)!=k->in(i)) // Different inputs? | |
155 goto collision; // "goto" is a speed hack... | |
156 if( n->cmp(*k) ) { // Check for any special bits | |
157 debug_only( _lookup_hits++ ); | |
158 return k; // Hit! | |
159 } | |
160 } | |
161 collision: | |
162 debug_only( _look_probes++ ); | |
163 key = (key + stride) & (_max-1); // Stride through table w/ relative prime | |
164 k = _table[key]; // Get hashed value | |
165 if( !k ) { // ?Miss? | |
166 debug_only( _lookup_misses++ ); | |
167 key = (first_sentinel == 0) ? key : first_sentinel; // ?saw sentinel? | |
168 _table[key] = n; // Insert into table! | |
169 debug_only(n->enter_hash_lock()); // Lock down the node while in the table. | |
170 check_grow(); // Grow table if insert hit limit | |
171 return NULL; // Miss! | |
172 } | |
173 else if( first_sentinel == 0 && k == _sentinel ) { | |
174 first_sentinel = key; // Can insert here | |
175 } | |
176 | |
177 } | |
178 ShouldNotReachHere(); | |
179 return NULL; | |
180 } | |
181 | |
182 //------------------------------hash_insert------------------------------------ | |
183 // Insert into hash table | |
184 void NodeHash::hash_insert( Node *n ) { | |
185 // // "conflict" comments -- print nodes that conflict | |
186 // bool conflict = false; | |
187 // n->set_hash(); | |
188 uint hash = n->hash(); | |
189 if (hash == Node::NO_HASH) { | |
190 return; | |
191 } | |
192 check_grow(); | |
193 uint key = hash & (_max-1); | |
194 uint stride = key | 0x01; | |
195 | |
196 while( 1 ) { // While probing hash table | |
197 debug_only( _insert_probes++ ); | |
198 Node *k = _table[key]; // Get hashed value | |
199 if( !k || (k == _sentinel) ) break; // Found a slot | |
200 assert( k != n, "already inserted" ); | |
201 // if( PrintCompilation && PrintOptoStatistics && Verbose ) { tty->print(" conflict: "); k->dump(); conflict = true; } | |
202 key = (key + stride) & (_max-1); // Stride through table w/ relative prime | |
203 } | |
204 _table[key] = n; // Insert into table! | |
205 debug_only(n->enter_hash_lock()); // Lock down the node while in the table. | |
206 // if( conflict ) { n->dump(); } | |
207 } | |
208 | |
209 //------------------------------hash_delete------------------------------------ | |
605 | 210 // Replace in hash table with sentinel |
0 | 211 bool NodeHash::hash_delete( const Node *n ) { |
212 Node *k; | |
213 uint hash = n->hash(); | |
214 if (hash == Node::NO_HASH) { | |
215 debug_only( _delete_misses++ ); | |
216 return false; | |
217 } | |
218 uint key = hash & (_max-1); | |
219 uint stride = key | 0x01; | |
220 debug_only( uint counter = 0; ); | |
605 | 221 for( ; /* (k != NULL) && (k != _sentinel) */; ) { |
0 | 222 debug_only( counter++ ); |
223 debug_only( _delete_probes++ ); | |
224 k = _table[key]; // Get hashed value | |
225 if( !k ) { // Miss? | |
226 debug_only( _delete_misses++ ); | |
227 #ifdef ASSERT | |
228 if( VerifyOpto ) { | |
229 for( uint i=0; i < _max; i++ ) | |
230 assert( _table[i] != n, "changed edges with rehashing" ); | |
231 } | |
232 #endif | |
233 return false; // Miss! Not in chain | |
234 } | |
235 else if( n == k ) { | |
236 debug_only( _delete_hits++ ); | |
237 _table[key] = _sentinel; // Hit! Label as deleted entry | |
238 debug_only(((Node*)n)->exit_hash_lock()); // Unlock the node upon removal from table. | |
239 return true; | |
240 } | |
241 else { | |
242 // collision: move through table with prime offset | |
243 key = (key + stride/*7*/) & (_max-1); | |
244 assert( counter <= _insert_limit, "Cycle in hash-table"); | |
245 } | |
246 } | |
247 ShouldNotReachHere(); | |
248 return false; | |
249 } | |
250 | |
251 //------------------------------round_up--------------------------------------- | |
252 // Round up to nearest power of 2 | |
253 uint NodeHash::round_up( uint x ) { | |
254 x += (x>>2); // Add 25% slop | |
255 if( x <16 ) return 16; // Small stuff | |
256 uint i=16; | |
257 while( i < x ) i <<= 1; // Double to fit | |
258 return i; // Return hash table size | |
259 } | |
260 | |
261 //------------------------------grow------------------------------------------- | |
262 // Grow _table to next power of 2 and insert old entries | |
263 void NodeHash::grow() { | |
264 // Record old state | |
265 uint old_max = _max; | |
266 Node **old_table = _table; | |
267 // Construct new table with twice the space | |
268 _grows++; | |
269 _total_inserts += _inserts; | |
270 _total_insert_probes += _insert_probes; | |
271 _inserts = 0; | |
272 _insert_probes = 0; | |
273 _max = _max << 1; | |
274 _table = NEW_ARENA_ARRAY( _a , Node* , _max ); // (Node**)_a->Amalloc( _max * sizeof(Node*) ); | |
275 memset(_table,0,sizeof(Node*)*_max); | |
276 _insert_limit = insert_limit(); | |
277 // Insert old entries into the new table | |
278 for( uint i = 0; i < old_max; i++ ) { | |
279 Node *m = *old_table++; | |
280 if( !m || m == _sentinel ) continue; | |
281 debug_only(m->exit_hash_lock()); // Unlock the node upon removal from old table. | |
282 hash_insert(m); | |
283 } | |
284 } | |
285 | |
286 //------------------------------clear------------------------------------------ | |
287 // Clear all entries in _table to NULL but keep storage | |
288 void NodeHash::clear() { | |
289 #ifdef ASSERT | |
290 // Unlock all nodes upon removal from table. | |
291 for (uint i = 0; i < _max; i++) { | |
292 Node* n = _table[i]; | |
293 if (!n || n == _sentinel) continue; | |
294 n->exit_hash_lock(); | |
295 } | |
296 #endif | |
297 | |
298 memset( _table, 0, _max * sizeof(Node*) ); | |
299 } | |
300 | |
301 //-----------------------remove_useless_nodes---------------------------------- | |
302 // Remove useless nodes from value table, | |
303 // implementation does not depend on hash function | |
304 void NodeHash::remove_useless_nodes(VectorSet &useful) { | |
305 | |
306 // Dead nodes in the hash table inherited from GVN should not replace | |
307 // existing nodes, remove dead nodes. | |
308 uint max = size(); | |
309 Node *sentinel_node = sentinel(); | |
310 for( uint i = 0; i < max; ++i ) { | |
311 Node *n = at(i); | |
312 if(n != NULL && n != sentinel_node && !useful.test(n->_idx)) { | |
313 debug_only(n->exit_hash_lock()); // Unlock the node when removed | |
314 _table[i] = sentinel_node; // Replace with placeholder | |
315 } | |
316 } | |
317 } | |
318 | |
319 #ifndef PRODUCT | |
320 //------------------------------dump------------------------------------------- | |
321 // Dump statistics for the hash table | |
322 void NodeHash::dump() { | |
323 _total_inserts += _inserts; | |
324 _total_insert_probes += _insert_probes; | |
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325 if (PrintCompilation && PrintOptoStatistics && Verbose && (_inserts > 0)) { |
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326 if (WizardMode) { |
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327 for (uint i=0; i<_max; i++) { |
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328 if (_table[i]) |
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329 tty->print("%d/%d/%d ",i,_table[i]->hash()&(_max-1),_table[i]->_idx); |
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330 } |
0 | 331 } |
332 tty->print("\nGVN Hash stats: %d grows to %d max_size\n", _grows, _max); | |
333 tty->print(" %d/%d (%8.1f%% full)\n", _inserts, _max, (double)_inserts/_max*100.0); | |
334 tty->print(" %dp/(%dh+%dm) (%8.2f probes/lookup)\n", _look_probes, _lookup_hits, _lookup_misses, (double)_look_probes/(_lookup_hits+_lookup_misses)); | |
335 tty->print(" %dp/%di (%8.2f probes/insert)\n", _total_insert_probes, _total_inserts, (double)_total_insert_probes/_total_inserts); | |
336 // sentinels increase lookup cost, but not insert cost | |
337 assert((_lookup_misses+_lookup_hits)*4+100 >= _look_probes, "bad hash function"); | |
338 assert( _inserts+(_inserts>>3) < _max, "table too full" ); | |
339 assert( _inserts*3+100 >= _insert_probes, "bad hash function" ); | |
340 } | |
341 } | |
342 | |
343 Node *NodeHash::find_index(uint idx) { // For debugging | |
344 // Find an entry by its index value | |
345 for( uint i = 0; i < _max; i++ ) { | |
346 Node *m = _table[i]; | |
347 if( !m || m == _sentinel ) continue; | |
348 if( m->_idx == (uint)idx ) return m; | |
349 } | |
350 return NULL; | |
351 } | |
352 #endif | |
353 | |
354 #ifdef ASSERT | |
355 NodeHash::~NodeHash() { | |
356 // Unlock all nodes upon destruction of table. | |
357 if (_table != (Node**)badAddress) clear(); | |
358 } | |
359 | |
360 void NodeHash::operator=(const NodeHash& nh) { | |
361 // Unlock all nodes upon replacement of table. | |
362 if (&nh == this) return; | |
363 if (_table != (Node**)badAddress) clear(); | |
364 memcpy(this, &nh, sizeof(*this)); | |
365 // Do not increment hash_lock counts again. | |
366 // Instead, be sure we never again use the source table. | |
367 ((NodeHash*)&nh)->_table = (Node**)badAddress; | |
368 } | |
369 | |
370 | |
371 #endif | |
372 | |
373 | |
374 //============================================================================= | |
375 //------------------------------PhaseRemoveUseless----------------------------- | |
376 // 1) Use a breadthfirst walk to collect useful nodes reachable from root. | |
377 PhaseRemoveUseless::PhaseRemoveUseless( PhaseGVN *gvn, Unique_Node_List *worklist ) : Phase(Remove_Useless), | |
378 _useful(Thread::current()->resource_area()) { | |
379 | |
380 // Implementation requires 'UseLoopSafepoints == true' and an edge from root | |
381 // to each SafePointNode at a backward branch. Inserted in add_safepoint(). | |
382 if( !UseLoopSafepoints || !OptoRemoveUseless ) return; | |
383 | |
384 // Identify nodes that are reachable from below, useful. | |
385 C->identify_useful_nodes(_useful); | |
386 | |
387 // Remove all useless nodes from PhaseValues' recorded types | |
388 // Must be done before disconnecting nodes to preserve hash-table-invariant | |
389 gvn->remove_useless_nodes(_useful.member_set()); | |
390 | |
391 // Remove all useless nodes from future worklist | |
392 worklist->remove_useless_nodes(_useful.member_set()); | |
393 | |
394 // Disconnect 'useless' nodes that are adjacent to useful nodes | |
395 C->remove_useless_nodes(_useful); | |
396 | |
397 // Remove edges from "root" to each SafePoint at a backward branch. | |
398 // They were inserted during parsing (see add_safepoint()) to make infinite | |
399 // loops without calls or exceptions visible to root, i.e., useful. | |
400 Node *root = C->root(); | |
401 if( root != NULL ) { | |
402 for( uint i = root->req(); i < root->len(); ++i ) { | |
403 Node *n = root->in(i); | |
404 if( n != NULL && n->is_SafePoint() ) { | |
405 root->rm_prec(i); | |
406 --i; | |
407 } | |
408 } | |
409 } | |
410 } | |
411 | |
412 | |
413 //============================================================================= | |
414 //------------------------------PhaseTransform--------------------------------- | |
415 PhaseTransform::PhaseTransform( PhaseNumber pnum ) : Phase(pnum), | |
416 _arena(Thread::current()->resource_area()), | |
417 _nodes(_arena), | |
418 _types(_arena) | |
419 { | |
420 init_con_caches(); | |
421 #ifndef PRODUCT | |
422 clear_progress(); | |
423 clear_transforms(); | |
424 set_allow_progress(true); | |
425 #endif | |
426 // Force allocation for currently existing nodes | |
427 _types.map(C->unique(), NULL); | |
428 } | |
429 | |
430 //------------------------------PhaseTransform--------------------------------- | |
431 PhaseTransform::PhaseTransform( Arena *arena, PhaseNumber pnum ) : Phase(pnum), | |
432 _arena(arena), | |
433 _nodes(arena), | |
434 _types(arena) | |
435 { | |
436 init_con_caches(); | |
437 #ifndef PRODUCT | |
438 clear_progress(); | |
439 clear_transforms(); | |
440 set_allow_progress(true); | |
441 #endif | |
442 // Force allocation for currently existing nodes | |
443 _types.map(C->unique(), NULL); | |
444 } | |
445 | |
446 //------------------------------PhaseTransform--------------------------------- | |
447 // Initialize with previously generated type information | |
448 PhaseTransform::PhaseTransform( PhaseTransform *pt, PhaseNumber pnum ) : Phase(pnum), | |
449 _arena(pt->_arena), | |
450 _nodes(pt->_nodes), | |
451 _types(pt->_types) | |
452 { | |
453 init_con_caches(); | |
454 #ifndef PRODUCT | |
455 clear_progress(); | |
456 clear_transforms(); | |
457 set_allow_progress(true); | |
458 #endif | |
459 } | |
460 | |
461 void PhaseTransform::init_con_caches() { | |
462 memset(_icons,0,sizeof(_icons)); | |
463 memset(_lcons,0,sizeof(_lcons)); | |
464 memset(_zcons,0,sizeof(_zcons)); | |
465 } | |
466 | |
467 | |
468 //--------------------------------find_int_type-------------------------------- | |
469 const TypeInt* PhaseTransform::find_int_type(Node* n) { | |
470 if (n == NULL) return NULL; | |
471 // Call type_or_null(n) to determine node's type since we might be in | |
472 // parse phase and call n->Value() may return wrong type. | |
473 // (For example, a phi node at the beginning of loop parsing is not ready.) | |
474 const Type* t = type_or_null(n); | |
475 if (t == NULL) return NULL; | |
476 return t->isa_int(); | |
477 } | |
478 | |
479 | |
480 //-------------------------------find_long_type-------------------------------- | |
481 const TypeLong* PhaseTransform::find_long_type(Node* n) { | |
482 if (n == NULL) return NULL; | |
483 // (See comment above on type_or_null.) | |
484 const Type* t = type_or_null(n); | |
485 if (t == NULL) return NULL; | |
486 return t->isa_long(); | |
487 } | |
488 | |
489 | |
490 #ifndef PRODUCT | |
491 void PhaseTransform::dump_old2new_map() const { | |
492 _nodes.dump(); | |
493 } | |
494 | |
495 void PhaseTransform::dump_new( uint nidx ) const { | |
496 for( uint i=0; i<_nodes.Size(); i++ ) | |
497 if( _nodes[i] && _nodes[i]->_idx == nidx ) { | |
498 _nodes[i]->dump(); | |
499 tty->cr(); | |
500 tty->print_cr("Old index= %d",i); | |
501 return; | |
502 } | |
503 tty->print_cr("Node %d not found in the new indices", nidx); | |
504 } | |
505 | |
506 //------------------------------dump_types------------------------------------- | |
507 void PhaseTransform::dump_types( ) const { | |
508 _types.dump(); | |
509 } | |
510 | |
511 //------------------------------dump_nodes_and_types--------------------------- | |
512 void PhaseTransform::dump_nodes_and_types(const Node *root, uint depth, bool only_ctrl) { | |
513 VectorSet visited(Thread::current()->resource_area()); | |
514 dump_nodes_and_types_recur( root, depth, only_ctrl, visited ); | |
515 } | |
516 | |
517 //------------------------------dump_nodes_and_types_recur--------------------- | |
518 void PhaseTransform::dump_nodes_and_types_recur( const Node *n, uint depth, bool only_ctrl, VectorSet &visited) { | |
519 if( !n ) return; | |
520 if( depth == 0 ) return; | |
521 if( visited.test_set(n->_idx) ) return; | |
522 for( uint i=0; i<n->len(); i++ ) { | |
523 if( only_ctrl && !(n->is_Region()) && i != TypeFunc::Control ) continue; | |
524 dump_nodes_and_types_recur( n->in(i), depth-1, only_ctrl, visited ); | |
525 } | |
526 n->dump(); | |
527 if (type_or_null(n) != NULL) { | |
528 tty->print(" "); type(n)->dump(); tty->cr(); | |
529 } | |
530 } | |
531 | |
532 #endif | |
533 | |
534 | |
535 //============================================================================= | |
536 //------------------------------PhaseValues------------------------------------ | |
537 // Set minimum table size to "255" | |
538 PhaseValues::PhaseValues( Arena *arena, uint est_max_size ) : PhaseTransform(arena, GVN), _table(arena, est_max_size) { | |
539 NOT_PRODUCT( clear_new_values(); ) | |
540 } | |
541 | |
542 //------------------------------PhaseValues------------------------------------ | |
543 // Set minimum table size to "255" | |
544 PhaseValues::PhaseValues( PhaseValues *ptv ) : PhaseTransform( ptv, GVN ), | |
545 _table(&ptv->_table) { | |
546 NOT_PRODUCT( clear_new_values(); ) | |
547 } | |
548 | |
549 //------------------------------PhaseValues------------------------------------ | |
550 // Used by +VerifyOpto. Clear out hash table but copy _types array. | |
551 PhaseValues::PhaseValues( PhaseValues *ptv, const char *dummy ) : PhaseTransform( ptv, GVN ), | |
552 _table(ptv->arena(),ptv->_table.size()) { | |
553 NOT_PRODUCT( clear_new_values(); ) | |
554 } | |
555 | |
556 //------------------------------~PhaseValues----------------------------------- | |
557 #ifndef PRODUCT | |
558 PhaseValues::~PhaseValues() { | |
559 _table.dump(); | |
560 | |
561 // Statistics for value progress and efficiency | |
562 if( PrintCompilation && Verbose && WizardMode ) { | |
563 tty->print("\n%sValues: %d nodes ---> %d/%d (%d)", | |
564 is_IterGVN() ? "Iter" : " ", C->unique(), made_progress(), made_transforms(), made_new_values()); | |
565 if( made_transforms() != 0 ) { | |
566 tty->print_cr(" ratio %f", made_progress()/(float)made_transforms() ); | |
567 } else { | |
568 tty->cr(); | |
569 } | |
570 } | |
571 } | |
572 #endif | |
573 | |
574 //------------------------------makecon---------------------------------------- | |
575 ConNode* PhaseTransform::makecon(const Type *t) { | |
576 assert(t->singleton(), "must be a constant"); | |
577 assert(!t->empty() || t == Type::TOP, "must not be vacuous range"); | |
578 switch (t->base()) { // fast paths | |
579 case Type::Half: | |
580 case Type::Top: return (ConNode*) C->top(); | |
581 case Type::Int: return intcon( t->is_int()->get_con() ); | |
582 case Type::Long: return longcon( t->is_long()->get_con() ); | |
583 } | |
584 if (t->is_zero_type()) | |
585 return zerocon(t->basic_type()); | |
586 return uncached_makecon(t); | |
587 } | |
588 | |
589 //--------------------------uncached_makecon----------------------------------- | |
590 // Make an idealized constant - one of ConINode, ConPNode, etc. | |
591 ConNode* PhaseValues::uncached_makecon(const Type *t) { | |
592 assert(t->singleton(), "must be a constant"); | |
593 ConNode* x = ConNode::make(C, t); | |
594 ConNode* k = (ConNode*)hash_find_insert(x); // Value numbering | |
595 if (k == NULL) { | |
596 set_type(x, t); // Missed, provide type mapping | |
597 GrowableArray<Node_Notes*>* nna = C->node_note_array(); | |
598 if (nna != NULL) { | |
599 Node_Notes* loc = C->locate_node_notes(nna, x->_idx, true); | |
600 loc->clear(); // do not put debug info on constants | |
601 } | |
602 } else { | |
603 x->destruct(); // Hit, destroy duplicate constant | |
604 x = k; // use existing constant | |
605 } | |
606 return x; | |
607 } | |
608 | |
609 //------------------------------intcon----------------------------------------- | |
610 // Fast integer constant. Same as "transform(new ConINode(TypeInt::make(i)))" | |
611 ConINode* PhaseTransform::intcon(int i) { | |
612 // Small integer? Check cache! Check that cached node is not dead | |
613 if (i >= _icon_min && i <= _icon_max) { | |
614 ConINode* icon = _icons[i-_icon_min]; | |
615 if (icon != NULL && icon->in(TypeFunc::Control) != NULL) | |
616 return icon; | |
617 } | |
618 ConINode* icon = (ConINode*) uncached_makecon(TypeInt::make(i)); | |
619 assert(icon->is_Con(), ""); | |
620 if (i >= _icon_min && i <= _icon_max) | |
621 _icons[i-_icon_min] = icon; // Cache small integers | |
622 return icon; | |
623 } | |
624 | |
625 //------------------------------longcon---------------------------------------- | |
626 // Fast long constant. | |
627 ConLNode* PhaseTransform::longcon(jlong l) { | |
628 // Small integer? Check cache! Check that cached node is not dead | |
629 if (l >= _lcon_min && l <= _lcon_max) { | |
630 ConLNode* lcon = _lcons[l-_lcon_min]; | |
631 if (lcon != NULL && lcon->in(TypeFunc::Control) != NULL) | |
632 return lcon; | |
633 } | |
634 ConLNode* lcon = (ConLNode*) uncached_makecon(TypeLong::make(l)); | |
635 assert(lcon->is_Con(), ""); | |
636 if (l >= _lcon_min && l <= _lcon_max) | |
637 _lcons[l-_lcon_min] = lcon; // Cache small integers | |
638 return lcon; | |
639 } | |
640 | |
641 //------------------------------zerocon----------------------------------------- | |
642 // Fast zero or null constant. Same as "transform(ConNode::make(Type::get_zero_type(bt)))" | |
643 ConNode* PhaseTransform::zerocon(BasicType bt) { | |
644 assert((uint)bt <= _zcon_max, "domain check"); | |
645 ConNode* zcon = _zcons[bt]; | |
646 if (zcon != NULL && zcon->in(TypeFunc::Control) != NULL) | |
647 return zcon; | |
648 zcon = (ConNode*) uncached_makecon(Type::get_zero_type(bt)); | |
649 _zcons[bt] = zcon; | |
650 return zcon; | |
651 } | |
652 | |
653 | |
654 | |
655 //============================================================================= | |
656 //------------------------------transform-------------------------------------- | |
657 // Return a node which computes the same function as this node, but in a | |
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658 // faster or cheaper fashion. |
0 | 659 Node *PhaseGVN::transform( Node *n ) { |
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660 return transform_no_reclaim(n); |
0 | 661 } |
662 | |
663 //------------------------------transform-------------------------------------- | |
664 // Return a node which computes the same function as this node, but | |
665 // in a faster or cheaper fashion. | |
666 Node *PhaseGVN::transform_no_reclaim( Node *n ) { | |
667 NOT_PRODUCT( set_transforms(); ) | |
668 | |
669 // Apply the Ideal call in a loop until it no longer applies | |
670 Node *k = n; | |
671 NOT_PRODUCT( uint loop_count = 0; ) | |
672 while( 1 ) { | |
673 Node *i = k->Ideal(this, /*can_reshape=*/false); | |
674 if( !i ) break; | |
675 assert( i->_idx >= k->_idx, "Idealize should return new nodes, use Identity to return old nodes" ); | |
676 k = i; | |
677 assert(loop_count++ < K, "infinite loop in PhaseGVN::transform"); | |
678 } | |
679 NOT_PRODUCT( if( loop_count != 0 ) { set_progress(); } ) | |
680 | |
681 | |
682 // If brand new node, make space in type array. | |
683 ensure_type_or_null(k); | |
684 | |
685 // Since I just called 'Value' to compute the set of run-time values | |
686 // for this Node, and 'Value' is non-local (and therefore expensive) I'll | |
687 // cache Value. Later requests for the local phase->type of this Node can | |
688 // use the cached Value instead of suffering with 'bottom_type'. | |
689 const Type *t = k->Value(this); // Get runtime Value set | |
690 assert(t != NULL, "value sanity"); | |
691 if (type_or_null(k) != t) { | |
692 #ifndef PRODUCT | |
693 // Do not count initial visit to node as a transformation | |
694 if (type_or_null(k) == NULL) { | |
695 inc_new_values(); | |
696 set_progress(); | |
697 } | |
698 #endif | |
699 set_type(k, t); | |
700 // If k is a TypeNode, capture any more-precise type permanently into Node | |
701 k->raise_bottom_type(t); | |
702 } | |
703 | |
704 if( t->singleton() && !k->is_Con() ) { | |
705 NOT_PRODUCT( set_progress(); ) | |
706 return makecon(t); // Turn into a constant | |
707 } | |
708 | |
709 // Now check for Identities | |
710 Node *i = k->Identity(this); // Look for a nearby replacement | |
711 if( i != k ) { // Found? Return replacement! | |
712 NOT_PRODUCT( set_progress(); ) | |
713 return i; | |
714 } | |
715 | |
716 // Global Value Numbering | |
717 i = hash_find_insert(k); // Insert if new | |
718 if( i && (i != k) ) { | |
719 // Return the pre-existing node | |
720 NOT_PRODUCT( set_progress(); ) | |
721 return i; | |
722 } | |
723 | |
724 // Return Idealized original | |
725 return k; | |
726 } | |
727 | |
728 #ifdef ASSERT | |
729 //------------------------------dead_loop_check-------------------------------- | |
605 | 730 // Check for a simple dead loop when a data node references itself directly |
0 | 731 // or through an other data node excluding cons and phis. |
732 void PhaseGVN::dead_loop_check( Node *n ) { | |
733 // Phi may reference itself in a loop | |
734 if (n != NULL && !n->is_dead_loop_safe() && !n->is_CFG()) { | |
735 // Do 2 levels check and only data inputs. | |
736 bool no_dead_loop = true; | |
737 uint cnt = n->req(); | |
738 for (uint i = 1; i < cnt && no_dead_loop; i++) { | |
739 Node *in = n->in(i); | |
740 if (in == n) { | |
741 no_dead_loop = false; | |
742 } else if (in != NULL && !in->is_dead_loop_safe()) { | |
743 uint icnt = in->req(); | |
744 for (uint j = 1; j < icnt && no_dead_loop; j++) { | |
745 if (in->in(j) == n || in->in(j) == in) | |
746 no_dead_loop = false; | |
747 } | |
748 } | |
749 } | |
750 if (!no_dead_loop) n->dump(3); | |
751 assert(no_dead_loop, "dead loop detected"); | |
752 } | |
753 } | |
754 #endif | |
755 | |
756 //============================================================================= | |
757 //------------------------------PhaseIterGVN----------------------------------- | |
758 // Initialize hash table to fresh and clean for +VerifyOpto | |
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759 PhaseIterGVN::PhaseIterGVN( PhaseIterGVN *igvn, const char *dummy ) : PhaseGVN(igvn,dummy), _worklist( ), |
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760 _delay_transform(false) { |
0 | 761 } |
762 | |
763 //------------------------------PhaseIterGVN----------------------------------- | |
764 // Initialize with previous PhaseIterGVN info; used by PhaseCCP | |
765 PhaseIterGVN::PhaseIterGVN( PhaseIterGVN *igvn ) : PhaseGVN(igvn), | |
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766 _worklist( igvn->_worklist ), |
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767 _delay_transform(igvn->_delay_transform) |
0 | 768 { |
769 } | |
770 | |
771 //------------------------------PhaseIterGVN----------------------------------- | |
772 // Initialize with previous PhaseGVN info from Parser | |
773 PhaseIterGVN::PhaseIterGVN( PhaseGVN *gvn ) : PhaseGVN(gvn), | |
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774 _worklist(*C->for_igvn()), |
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775 _delay_transform(false) |
0 | 776 { |
777 uint max; | |
778 | |
779 // Dead nodes in the hash table inherited from GVN were not treated as | |
780 // roots during def-use info creation; hence they represent an invisible | |
781 // use. Clear them out. | |
782 max = _table.size(); | |
783 for( uint i = 0; i < max; ++i ) { | |
784 Node *n = _table.at(i); | |
785 if(n != NULL && n != _table.sentinel() && n->outcnt() == 0) { | |
786 if( n->is_top() ) continue; | |
787 assert( false, "Parse::remove_useless_nodes missed this node"); | |
788 hash_delete(n); | |
789 } | |
790 } | |
791 | |
792 // Any Phis or Regions on the worklist probably had uses that could not | |
793 // make more progress because the uses were made while the Phis and Regions | |
794 // were in half-built states. Put all uses of Phis and Regions on worklist. | |
795 max = _worklist.size(); | |
796 for( uint j = 0; j < max; j++ ) { | |
797 Node *n = _worklist.at(j); | |
798 uint uop = n->Opcode(); | |
799 if( uop == Op_Phi || uop == Op_Region || | |
800 n->is_Type() || | |
801 n->is_Mem() ) | |
802 add_users_to_worklist(n); | |
803 } | |
804 } | |
805 | |
806 | |
807 #ifndef PRODUCT | |
808 void PhaseIterGVN::verify_step(Node* n) { | |
809 _verify_window[_verify_counter % _verify_window_size] = n; | |
810 ++_verify_counter; | |
811 ResourceMark rm; | |
812 ResourceArea *area = Thread::current()->resource_area(); | |
813 VectorSet old_space(area), new_space(area); | |
814 if (C->unique() < 1000 || | |
815 0 == _verify_counter % (C->unique() < 10000 ? 10 : 100)) { | |
816 ++_verify_full_passes; | |
817 Node::verify_recur(C->root(), -1, old_space, new_space); | |
818 } | |
819 const int verify_depth = 4; | |
820 for ( int i = 0; i < _verify_window_size; i++ ) { | |
821 Node* n = _verify_window[i]; | |
822 if ( n == NULL ) continue; | |
823 if( n->in(0) == NodeSentinel ) { // xform_idom | |
824 _verify_window[i] = n->in(1); | |
825 --i; continue; | |
826 } | |
827 // Typical fanout is 1-2, so this call visits about 6 nodes. | |
828 Node::verify_recur(n, verify_depth, old_space, new_space); | |
829 } | |
830 } | |
831 #endif | |
832 | |
833 | |
834 //------------------------------init_worklist---------------------------------- | |
835 // Initialize worklist for each node. | |
836 void PhaseIterGVN::init_worklist( Node *n ) { | |
837 if( _worklist.member(n) ) return; | |
838 _worklist.push(n); | |
839 uint cnt = n->req(); | |
840 for( uint i =0 ; i < cnt; i++ ) { | |
841 Node *m = n->in(i); | |
842 if( m ) init_worklist(m); | |
843 } | |
844 } | |
845 | |
846 //------------------------------optimize--------------------------------------- | |
847 void PhaseIterGVN::optimize() { | |
848 debug_only(uint num_processed = 0;); | |
849 #ifndef PRODUCT | |
850 { | |
851 _verify_counter = 0; | |
852 _verify_full_passes = 0; | |
853 for ( int i = 0; i < _verify_window_size; i++ ) { | |
854 _verify_window[i] = NULL; | |
855 } | |
856 } | |
857 #endif | |
858 | |
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859 #ifdef ASSERT |
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860 Node* prev = NULL; |
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861 uint rep_cnt = 0; |
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862 #endif |
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863 uint loop_count = 0; |
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864 |
0 | 865 // Pull from worklist; transform node; |
866 // If node has changed: update edge info and put uses on worklist. | |
867 while( _worklist.size() ) { | |
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868 if (C->check_node_count(NodeLimitFudgeFactor * 2, |
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869 "out of nodes optimizing method")) { |
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870 return; |
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871 } |
0 | 872 Node *n = _worklist.pop(); |
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873 if (++loop_count >= K * C->unique()) { |
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874 debug_only(n->dump(4);) |
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875 assert(false, "infinite loop in PhaseIterGVN::optimize"); |
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876 C->record_method_not_compilable("infinite loop in PhaseIterGVN::optimize"); |
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877 return; |
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878 } |
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879 #ifdef ASSERT |
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880 if (n == prev) { |
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881 if (++rep_cnt > 3) { |
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882 n->dump(4); |
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883 assert(false, "loop in Ideal transformation"); |
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884 } |
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885 } else { |
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886 rep_cnt = 0; |
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887 } |
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888 prev = n; |
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889 #endif |
0 | 890 if (TraceIterativeGVN && Verbose) { |
891 tty->print(" Pop "); | |
892 NOT_PRODUCT( n->dump(); ) | |
893 debug_only(if( (num_processed++ % 100) == 0 ) _worklist.print_set();) | |
894 } | |
895 | |
896 if (n->outcnt() != 0) { | |
897 | |
898 #ifndef PRODUCT | |
899 uint wlsize = _worklist.size(); | |
900 const Type* oldtype = type_or_null(n); | |
901 #endif //PRODUCT | |
902 | |
903 Node *nn = transform_old(n); | |
904 | |
905 #ifndef PRODUCT | |
906 if (TraceIterativeGVN) { | |
907 const Type* newtype = type_or_null(n); | |
908 if (nn != n) { | |
909 // print old node | |
910 tty->print("< "); | |
911 if (oldtype != newtype && oldtype != NULL) { | |
912 oldtype->dump(); | |
913 } | |
914 do { tty->print("\t"); } while (tty->position() < 16); | |
915 tty->print("<"); | |
916 n->dump(); | |
917 } | |
918 if (oldtype != newtype || nn != n) { | |
919 // print new node and/or new type | |
920 if (oldtype == NULL) { | |
921 tty->print("* "); | |
922 } else if (nn != n) { | |
923 tty->print("> "); | |
924 } else { | |
925 tty->print("= "); | |
926 } | |
927 if (newtype == NULL) { | |
928 tty->print("null"); | |
929 } else { | |
930 newtype->dump(); | |
931 } | |
932 do { tty->print("\t"); } while (tty->position() < 16); | |
933 nn->dump(); | |
934 } | |
935 if (Verbose && wlsize < _worklist.size()) { | |
936 tty->print(" Push {"); | |
937 while (wlsize != _worklist.size()) { | |
938 Node* pushed = _worklist.at(wlsize++); | |
939 tty->print(" %d", pushed->_idx); | |
940 } | |
941 tty->print_cr(" }"); | |
942 } | |
943 } | |
944 if( VerifyIterativeGVN && nn != n ) { | |
945 verify_step((Node*) NULL); // ignore n, it might be subsumed | |
946 } | |
947 #endif | |
948 } else if (!n->is_top()) { | |
949 remove_dead_node(n); | |
950 } | |
951 } | |
952 | |
953 #ifndef PRODUCT | |
954 C->verify_graph_edges(); | |
955 if( VerifyOpto && allow_progress() ) { | |
956 // Must turn off allow_progress to enable assert and break recursion | |
957 C->root()->verify(); | |
958 { // Check if any progress was missed using IterGVN | |
959 // Def-Use info enables transformations not attempted in wash-pass | |
960 // e.g. Region/Phi cleanup, ... | |
961 // Null-check elision -- may not have reached fixpoint | |
962 // do not propagate to dominated nodes | |
963 ResourceMark rm; | |
964 PhaseIterGVN igvn2(this,"Verify"); // Fresh and clean! | |
965 // Fill worklist completely | |
966 igvn2.init_worklist(C->root()); | |
967 | |
968 igvn2.set_allow_progress(false); | |
969 igvn2.optimize(); | |
970 igvn2.set_allow_progress(true); | |
971 } | |
972 } | |
973 if ( VerifyIterativeGVN && PrintOpto ) { | |
974 if ( _verify_counter == _verify_full_passes ) | |
975 tty->print_cr("VerifyIterativeGVN: %d transforms and verify passes", | |
976 _verify_full_passes); | |
977 else | |
978 tty->print_cr("VerifyIterativeGVN: %d transforms, %d full verify passes", | |
979 _verify_counter, _verify_full_passes); | |
980 } | |
981 #endif | |
982 } | |
983 | |
984 | |
985 //------------------register_new_node_with_optimizer--------------------------- | |
986 // Register a new node with the optimizer. Update the types array, the def-use | |
987 // info. Put on worklist. | |
988 Node* PhaseIterGVN::register_new_node_with_optimizer(Node* n, Node* orig) { | |
989 set_type_bottom(n); | |
990 _worklist.push(n); | |
991 if (orig != NULL) C->copy_node_notes_to(n, orig); | |
992 return n; | |
993 } | |
994 | |
995 //------------------------------transform-------------------------------------- | |
996 // Non-recursive: idealize Node 'n' with respect to its inputs and its value | |
997 Node *PhaseIterGVN::transform( Node *n ) { | |
113
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998 if (_delay_transform) { |
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999 // Register the node but don't optimize for now |
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1000 register_new_node_with_optimizer(n); |
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1001 return n; |
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1002 } |
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1003 |
0 | 1004 // If brand new node, make space in type array, and give it a type. |
1005 ensure_type_or_null(n); | |
1006 if (type_or_null(n) == NULL) { | |
1007 set_type_bottom(n); | |
1008 } | |
1009 | |
1010 return transform_old(n); | |
1011 } | |
1012 | |
1013 //------------------------------transform_old---------------------------------- | |
1014 Node *PhaseIterGVN::transform_old( Node *n ) { | |
1015 #ifndef PRODUCT | |
1016 debug_only(uint loop_count = 0;); | |
1017 set_transforms(); | |
1018 #endif | |
1019 // Remove 'n' from hash table in case it gets modified | |
1020 _table.hash_delete(n); | |
1021 if( VerifyIterativeGVN ) { | |
1022 assert( !_table.find_index(n->_idx), "found duplicate entry in table"); | |
1023 } | |
1024 | |
1025 // Apply the Ideal call in a loop until it no longer applies | |
1026 Node *k = n; | |
1027 DEBUG_ONLY(dead_loop_check(k);) | |
305 | 1028 DEBUG_ONLY(bool is_new = (k->outcnt() == 0);) |
0 | 1029 Node *i = k->Ideal(this, /*can_reshape=*/true); |
305 | 1030 assert(i != k || is_new || i->outcnt() > 0, "don't return dead nodes"); |
0 | 1031 #ifndef PRODUCT |
1032 if( VerifyIterativeGVN ) | |
1033 verify_step(k); | |
1034 if( i && VerifyOpto ) { | |
1035 if( !allow_progress() ) { | |
1036 if (i->is_Add() && i->outcnt() == 1) { | |
1037 // Switched input to left side because this is the only use | |
1038 } else if( i->is_If() && (i->in(0) == NULL) ) { | |
1039 // This IF is dead because it is dominated by an equivalent IF When | |
1040 // dominating if changed, info is not propagated sparsely to 'this' | |
1041 // Propagating this info further will spuriously identify other | |
1042 // progress. | |
1043 return i; | |
1044 } else | |
1045 set_progress(); | |
1046 } else | |
1047 set_progress(); | |
1048 } | |
1049 #endif | |
1050 | |
1051 while( i ) { | |
1052 #ifndef PRODUCT | |
1053 debug_only( if( loop_count >= K ) i->dump(4); ) | |
1054 assert(loop_count < K, "infinite loop in PhaseIterGVN::transform"); | |
1055 debug_only( loop_count++; ) | |
1056 #endif | |
1057 assert((i->_idx >= k->_idx) || i->is_top(), "Idealize should return new nodes, use Identity to return old nodes"); | |
1058 // Made a change; put users of original Node on worklist | |
1059 add_users_to_worklist( k ); | |
1060 // Replacing root of transform tree? | |
1061 if( k != i ) { | |
1062 // Make users of old Node now use new. | |
1063 subsume_node( k, i ); | |
1064 k = i; | |
1065 } | |
1066 DEBUG_ONLY(dead_loop_check(k);) | |
1067 // Try idealizing again | |
305 | 1068 DEBUG_ONLY(is_new = (k->outcnt() == 0);) |
0 | 1069 i = k->Ideal(this, /*can_reshape=*/true); |
305 | 1070 assert(i != k || is_new || i->outcnt() > 0, "don't return dead nodes"); |
0 | 1071 #ifndef PRODUCT |
1072 if( VerifyIterativeGVN ) | |
1073 verify_step(k); | |
1074 if( i && VerifyOpto ) set_progress(); | |
1075 #endif | |
1076 } | |
1077 | |
1078 // If brand new node, make space in type array. | |
1079 ensure_type_or_null(k); | |
1080 | |
1081 // See what kind of values 'k' takes on at runtime | |
1082 const Type *t = k->Value(this); | |
1083 assert(t != NULL, "value sanity"); | |
1084 | |
1085 // Since I just called 'Value' to compute the set of run-time values | |
1086 // for this Node, and 'Value' is non-local (and therefore expensive) I'll | |
1087 // cache Value. Later requests for the local phase->type of this Node can | |
1088 // use the cached Value instead of suffering with 'bottom_type'. | |
1089 if (t != type_or_null(k)) { | |
1090 NOT_PRODUCT( set_progress(); ) | |
1091 NOT_PRODUCT( inc_new_values();) | |
1092 set_type(k, t); | |
1093 // If k is a TypeNode, capture any more-precise type permanently into Node | |
1094 k->raise_bottom_type(t); | |
1095 // Move users of node to worklist | |
1096 add_users_to_worklist( k ); | |
1097 } | |
1098 | |
1099 // If 'k' computes a constant, replace it with a constant | |
1100 if( t->singleton() && !k->is_Con() ) { | |
1101 NOT_PRODUCT( set_progress(); ) | |
1102 Node *con = makecon(t); // Make a constant | |
1103 add_users_to_worklist( k ); | |
1104 subsume_node( k, con ); // Everybody using k now uses con | |
1105 return con; | |
1106 } | |
1107 | |
1108 // Now check for Identities | |
1109 i = k->Identity(this); // Look for a nearby replacement | |
1110 if( i != k ) { // Found? Return replacement! | |
1111 NOT_PRODUCT( set_progress(); ) | |
1112 add_users_to_worklist( k ); | |
1113 subsume_node( k, i ); // Everybody using k now uses i | |
1114 return i; | |
1115 } | |
1116 | |
1117 // Global Value Numbering | |
1118 i = hash_find_insert(k); // Check for pre-existing node | |
1119 if( i && (i != k) ) { | |
1120 // Return the pre-existing node if it isn't dead | |
1121 NOT_PRODUCT( set_progress(); ) | |
1122 add_users_to_worklist( k ); | |
1123 subsume_node( k, i ); // Everybody using k now uses i | |
1124 return i; | |
1125 } | |
1126 | |
1127 // Return Idealized original | |
1128 return k; | |
1129 } | |
1130 | |
1131 //---------------------------------saturate------------------------------------ | |
1132 const Type* PhaseIterGVN::saturate(const Type* new_type, const Type* old_type, | |
1133 const Type* limit_type) const { | |
1134 return new_type->narrow(old_type); | |
1135 } | |
1136 | |
1137 //------------------------------remove_globally_dead_node---------------------- | |
1138 // Kill a globally dead Node. All uses are also globally dead and are | |
1139 // aggressively trimmed. | |
1140 void PhaseIterGVN::remove_globally_dead_node( Node *dead ) { | |
1141 assert(dead != C->root(), "killing root, eh?"); | |
1142 if (dead->is_top()) return; | |
1143 NOT_PRODUCT( set_progress(); ) | |
1144 // Remove from iterative worklist | |
1145 _worklist.remove(dead); | |
1146 if (!dead->is_Con()) { // Don't kill cons but uses | |
1147 // Remove from hash table | |
1148 _table.hash_delete( dead ); | |
1149 // Smash all inputs to 'dead', isolating him completely | |
1150 for( uint i = 0; i < dead->req(); i++ ) { | |
1151 Node *in = dead->in(i); | |
1152 if( in ) { // Points to something? | |
1153 dead->set_req(i,NULL); // Kill the edge | |
1154 if (in->outcnt() == 0 && in != C->top()) {// Made input go dead? | |
1155 remove_dead_node(in); // Recursively remove | |
1156 } else if (in->outcnt() == 1 && | |
1157 in->has_special_unique_user()) { | |
1158 _worklist.push(in->unique_out()); | |
1159 } else if (in->outcnt() <= 2 && dead->is_Phi()) { | |
1160 if( in->Opcode() == Op_Region ) | |
1161 _worklist.push(in); | |
1162 else if( in->is_Store() ) { | |
1163 DUIterator_Fast imax, i = in->fast_outs(imax); | |
1164 _worklist.push(in->fast_out(i)); | |
1165 i++; | |
1166 if(in->outcnt() == 2) { | |
1167 _worklist.push(in->fast_out(i)); | |
1168 i++; | |
1169 } | |
1170 assert(!(i < imax), "sanity"); | |
1171 } | |
1172 } | |
1173 } | |
1174 } | |
1175 | |
1176 if (dead->is_macro()) { | |
1177 C->remove_macro_node(dead); | |
1178 } | |
1179 } | |
1180 // Aggressively kill globally dead uses | |
1181 // (Cannot use DUIterator_Last because of the indefinite number | |
1182 // of edge deletions per loop trip.) | |
1183 while (dead->outcnt() > 0) { | |
1184 remove_globally_dead_node(dead->raw_out(0)); | |
1185 } | |
1186 } | |
1187 | |
1188 //------------------------------subsume_node----------------------------------- | |
1189 // Remove users from node 'old' and add them to node 'nn'. | |
1190 void PhaseIterGVN::subsume_node( Node *old, Node *nn ) { | |
1191 assert( old != hash_find(old), "should already been removed" ); | |
1192 assert( old != C->top(), "cannot subsume top node"); | |
1193 // Copy debug or profile information to the new version: | |
1194 C->copy_node_notes_to(nn, old); | |
1195 // Move users of node 'old' to node 'nn' | |
1196 for (DUIterator_Last imin, i = old->last_outs(imin); i >= imin; ) { | |
1197 Node* use = old->last_out(i); // for each use... | |
1198 // use might need re-hashing (but it won't if it's a new node) | |
1199 bool is_in_table = _table.hash_delete( use ); | |
1200 // Update use-def info as well | |
1201 // We remove all occurrences of old within use->in, | |
1202 // so as to avoid rehashing any node more than once. | |
1203 // The hash table probe swamps any outer loop overhead. | |
1204 uint num_edges = 0; | |
1205 for (uint jmax = use->len(), j = 0; j < jmax; j++) { | |
1206 if (use->in(j) == old) { | |
1207 use->set_req(j, nn); | |
1208 ++num_edges; | |
1209 } | |
1210 } | |
1211 // Insert into GVN hash table if unique | |
1212 // If a duplicate, 'use' will be cleaned up when pulled off worklist | |
1213 if( is_in_table ) { | |
1214 hash_find_insert(use); | |
1215 } | |
1216 i -= num_edges; // we deleted 1 or more copies of this edge | |
1217 } | |
1218 | |
1219 // Smash all inputs to 'old', isolating him completely | |
1220 Node *temp = new (C, 1) Node(1); | |
1221 temp->init_req(0,nn); // Add a use to nn to prevent him from dying | |
1222 remove_dead_node( old ); | |
1223 temp->del_req(0); // Yank bogus edge | |
1224 #ifndef PRODUCT | |
1225 if( VerifyIterativeGVN ) { | |
1226 for ( int i = 0; i < _verify_window_size; i++ ) { | |
1227 if ( _verify_window[i] == old ) | |
1228 _verify_window[i] = nn; | |
1229 } | |
1230 } | |
1231 #endif | |
1232 _worklist.remove(temp); // this can be necessary | |
1233 temp->destruct(); // reuse the _idx of this little guy | |
1234 } | |
1235 | |
1236 //------------------------------add_users_to_worklist-------------------------- | |
1237 void PhaseIterGVN::add_users_to_worklist0( Node *n ) { | |
1238 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1239 _worklist.push(n->fast_out(i)); // Push on worklist | |
1240 } | |
1241 } | |
1242 | |
1243 void PhaseIterGVN::add_users_to_worklist( Node *n ) { | |
1244 add_users_to_worklist0(n); | |
1245 | |
1246 // Move users of node to worklist | |
1247 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1248 Node* use = n->fast_out(i); // Get use | |
1249 | |
1250 if( use->is_Multi() || // Multi-definer? Push projs on worklist | |
1251 use->is_Store() ) // Enable store/load same address | |
1252 add_users_to_worklist0(use); | |
1253 | |
1254 // If we changed the receiver type to a call, we need to revisit | |
1255 // the Catch following the call. It's looking for a non-NULL | |
1256 // receiver to know when to enable the regular fall-through path | |
1257 // in addition to the NullPtrException path. | |
1258 if (use->is_CallDynamicJava() && n == use->in(TypeFunc::Parms)) { | |
1259 Node* p = use->as_CallDynamicJava()->proj_out(TypeFunc::Control); | |
1260 if (p != NULL) { | |
1261 add_users_to_worklist0(p); | |
1262 } | |
1263 } | |
1264 | |
1265 if( use->is_Cmp() ) { // Enable CMP/BOOL optimization | |
1266 add_users_to_worklist(use); // Put Bool on worklist | |
1267 // Look for the 'is_x2logic' pattern: "x ? : 0 : 1" and put the | |
1268 // phi merging either 0 or 1 onto the worklist | |
1269 if (use->outcnt() > 0) { | |
1270 Node* bol = use->raw_out(0); | |
1271 if (bol->outcnt() > 0) { | |
1272 Node* iff = bol->raw_out(0); | |
1273 if (iff->outcnt() == 2) { | |
1274 Node* ifproj0 = iff->raw_out(0); | |
1275 Node* ifproj1 = iff->raw_out(1); | |
1276 if (ifproj0->outcnt() > 0 && ifproj1->outcnt() > 0) { | |
1277 Node* region0 = ifproj0->raw_out(0); | |
1278 Node* region1 = ifproj1->raw_out(0); | |
1279 if( region0 == region1 ) | |
1280 add_users_to_worklist0(region0); | |
1281 } | |
1282 } | |
1283 } | |
1284 } | |
1285 } | |
1286 | |
1287 uint use_op = use->Opcode(); | |
1288 // If changed Cast input, check Phi users for simple cycles | |
65 | 1289 if( use->is_ConstraintCast() || use->is_CheckCastPP() ) { |
0 | 1290 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { |
1291 Node* u = use->fast_out(i2); | |
1292 if (u->is_Phi()) | |
1293 _worklist.push(u); | |
1294 } | |
1295 } | |
1296 // If changed LShift inputs, check RShift users for useless sign-ext | |
1297 if( use_op == Op_LShiftI ) { | |
1298 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { | |
1299 Node* u = use->fast_out(i2); | |
1300 if (u->Opcode() == Op_RShiftI) | |
1301 _worklist.push(u); | |
1302 } | |
1303 } | |
1304 // If changed AddP inputs, check Stores for loop invariant | |
1305 if( use_op == Op_AddP ) { | |
1306 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { | |
1307 Node* u = use->fast_out(i2); | |
1308 if (u->is_Mem()) | |
1309 _worklist.push(u); | |
1310 } | |
1311 } | |
1312 // If changed initialization activity, check dependent Stores | |
1313 if (use_op == Op_Allocate || use_op == Op_AllocateArray) { | |
1314 InitializeNode* init = use->as_Allocate()->initialization(); | |
1315 if (init != NULL) { | |
1316 Node* imem = init->proj_out(TypeFunc::Memory); | |
1317 if (imem != NULL) add_users_to_worklist0(imem); | |
1318 } | |
1319 } | |
1320 if (use_op == Op_Initialize) { | |
1321 Node* imem = use->as_Initialize()->proj_out(TypeFunc::Memory); | |
1322 if (imem != NULL) add_users_to_worklist0(imem); | |
1323 } | |
1324 } | |
1325 } | |
1326 | |
1327 //============================================================================= | |
1328 #ifndef PRODUCT | |
1329 uint PhaseCCP::_total_invokes = 0; | |
1330 uint PhaseCCP::_total_constants = 0; | |
1331 #endif | |
1332 //------------------------------PhaseCCP--------------------------------------- | |
1333 // Conditional Constant Propagation, ala Wegman & Zadeck | |
1334 PhaseCCP::PhaseCCP( PhaseIterGVN *igvn ) : PhaseIterGVN(igvn) { | |
1335 NOT_PRODUCT( clear_constants(); ) | |
1336 assert( _worklist.size() == 0, "" ); | |
1337 // Clear out _nodes from IterGVN. Must be clear to transform call. | |
1338 _nodes.clear(); // Clear out from IterGVN | |
1339 analyze(); | |
1340 } | |
1341 | |
1342 #ifndef PRODUCT | |
1343 //------------------------------~PhaseCCP-------------------------------------- | |
1344 PhaseCCP::~PhaseCCP() { | |
1345 inc_invokes(); | |
1346 _total_constants += count_constants(); | |
1347 } | |
1348 #endif | |
1349 | |
1350 | |
1351 #ifdef ASSERT | |
1352 static bool ccp_type_widens(const Type* t, const Type* t0) { | |
1353 assert(t->meet(t0) == t, "Not monotonic"); | |
1354 switch (t->base() == t0->base() ? t->base() : Type::Top) { | |
1355 case Type::Int: | |
1356 assert(t0->isa_int()->_widen <= t->isa_int()->_widen, "widen increases"); | |
1357 break; | |
1358 case Type::Long: | |
1359 assert(t0->isa_long()->_widen <= t->isa_long()->_widen, "widen increases"); | |
1360 break; | |
1361 } | |
1362 return true; | |
1363 } | |
1364 #endif //ASSERT | |
1365 | |
1366 //------------------------------analyze---------------------------------------- | |
1367 void PhaseCCP::analyze() { | |
1368 // Initialize all types to TOP, optimistic analysis | |
1369 for (int i = C->unique() - 1; i >= 0; i--) { | |
1370 _types.map(i,Type::TOP); | |
1371 } | |
1372 | |
1373 // Push root onto worklist | |
1374 Unique_Node_List worklist; | |
1375 worklist.push(C->root()); | |
1376 | |
1377 // Pull from worklist; compute new value; push changes out. | |
1378 // This loop is the meat of CCP. | |
1379 while( worklist.size() ) { | |
1380 Node *n = worklist.pop(); | |
1381 const Type *t = n->Value(this); | |
1382 if (t != type(n)) { | |
1383 assert(ccp_type_widens(t, type(n)), "ccp type must widen"); | |
1384 #ifndef PRODUCT | |
1385 if( TracePhaseCCP ) { | |
1386 t->dump(); | |
1387 do { tty->print("\t"); } while (tty->position() < 16); | |
1388 n->dump(); | |
1389 } | |
1390 #endif | |
1391 set_type(n, t); | |
1392 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1393 Node* m = n->fast_out(i); // Get user | |
1394 if( m->is_Region() ) { // New path to Region? Must recheck Phis too | |
1395 for (DUIterator_Fast i2max, i2 = m->fast_outs(i2max); i2 < i2max; i2++) { | |
1396 Node* p = m->fast_out(i2); // Propagate changes to uses | |
1397 if( p->bottom_type() != type(p) ) // If not already bottomed out | |
1398 worklist.push(p); // Propagate change to user | |
1399 } | |
1400 } | |
605 | 1401 // If we changed the receiver type to a call, we need to revisit |
0 | 1402 // the Catch following the call. It's looking for a non-NULL |
1403 // receiver to know when to enable the regular fall-through path | |
1404 // in addition to the NullPtrException path | |
1405 if (m->is_Call()) { | |
1406 for (DUIterator_Fast i2max, i2 = m->fast_outs(i2max); i2 < i2max; i2++) { | |
1407 Node* p = m->fast_out(i2); // Propagate changes to uses | |
1408 if (p->is_Proj() && p->as_Proj()->_con == TypeFunc::Control && p->outcnt() == 1) | |
1409 worklist.push(p->unique_out()); | |
1410 } | |
1411 } | |
1412 if( m->bottom_type() != type(m) ) // If not already bottomed out | |
1413 worklist.push(m); // Propagate change to user | |
1414 } | |
1415 } | |
1416 } | |
1417 } | |
1418 | |
1419 //------------------------------do_transform----------------------------------- | |
1420 // Top level driver for the recursive transformer | |
1421 void PhaseCCP::do_transform() { | |
1422 // Correct leaves of new-space Nodes; they point to old-space. | |
1423 C->set_root( transform(C->root())->as_Root() ); | |
1424 assert( C->top(), "missing TOP node" ); | |
1425 assert( C->root(), "missing root" ); | |
1426 } | |
1427 | |
1428 //------------------------------transform-------------------------------------- | |
1429 // Given a Node in old-space, clone him into new-space. | |
1430 // Convert any of his old-space children into new-space children. | |
1431 Node *PhaseCCP::transform( Node *n ) { | |
1432 Node *new_node = _nodes[n->_idx]; // Check for transformed node | |
1433 if( new_node != NULL ) | |
1434 return new_node; // Been there, done that, return old answer | |
1435 new_node = transform_once(n); // Check for constant | |
1436 _nodes.map( n->_idx, new_node ); // Flag as having been cloned | |
1437 | |
1438 // Allocate stack of size _nodes.Size()/2 to avoid frequent realloc | |
1439 GrowableArray <Node *> trstack(C->unique() >> 1); | |
1440 | |
1441 trstack.push(new_node); // Process children of cloned node | |
1442 while ( trstack.is_nonempty() ) { | |
1443 Node *clone = trstack.pop(); | |
1444 uint cnt = clone->req(); | |
1445 for( uint i = 0; i < cnt; i++ ) { // For all inputs do | |
1446 Node *input = clone->in(i); | |
1447 if( input != NULL ) { // Ignore NULLs | |
1448 Node *new_input = _nodes[input->_idx]; // Check for cloned input node | |
1449 if( new_input == NULL ) { | |
1450 new_input = transform_once(input); // Check for constant | |
1451 _nodes.map( input->_idx, new_input );// Flag as having been cloned | |
1452 trstack.push(new_input); | |
1453 } | |
1454 assert( new_input == clone->in(i), "insanity check"); | |
1455 } | |
1456 } | |
1457 } | |
1458 return new_node; | |
1459 } | |
1460 | |
1461 | |
1462 //------------------------------transform_once--------------------------------- | |
1463 // For PhaseCCP, transformation is IDENTITY unless Node computed a constant. | |
1464 Node *PhaseCCP::transform_once( Node *n ) { | |
1465 const Type *t = type(n); | |
1466 // Constant? Use constant Node instead | |
1467 if( t->singleton() ) { | |
1468 Node *nn = n; // Default is to return the original constant | |
1469 if( t == Type::TOP ) { | |
1470 // cache my top node on the Compile instance | |
1471 if( C->cached_top_node() == NULL || C->cached_top_node()->in(0) == NULL ) { | |
1472 C->set_cached_top_node( ConNode::make(C, Type::TOP) ); | |
1473 set_type(C->top(), Type::TOP); | |
1474 } | |
1475 nn = C->top(); | |
1476 } | |
1477 if( !n->is_Con() ) { | |
1478 if( t != Type::TOP ) { | |
1479 nn = makecon(t); // ConNode::make(t); | |
1480 NOT_PRODUCT( inc_constants(); ) | |
1481 } else if( n->is_Region() ) { // Unreachable region | |
1482 // Note: nn == C->top() | |
1483 n->set_req(0, NULL); // Cut selfreference | |
1484 // Eagerly remove dead phis to avoid phis copies creation. | |
1485 for (DUIterator i = n->outs(); n->has_out(i); i++) { | |
1486 Node* m = n->out(i); | |
1487 if( m->is_Phi() ) { | |
1488 assert(type(m) == Type::TOP, "Unreachable region should not have live phis."); | |
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1489 replace_node(m, nn); |
0 | 1490 --i; // deleted this phi; rescan starting with next position |
1491 } | |
1492 } | |
1493 } | |
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1494 replace_node(n,nn); // Update DefUse edges for new constant |
0 | 1495 } |
1496 return nn; | |
1497 } | |
1498 | |
1499 // If x is a TypeNode, capture any more-precise type permanently into Node | |
1500 if (t != n->bottom_type()) { | |
1501 hash_delete(n); // changing bottom type may force a rehash | |
1502 n->raise_bottom_type(t); | |
1503 _worklist.push(n); // n re-enters the hash table via the worklist | |
1504 } | |
1505 | |
1506 // Idealize graph using DU info. Must clone() into new-space. | |
1507 // DU info is generally used to show profitability, progress or safety | |
1508 // (but generally not needed for correctness). | |
1509 Node *nn = n->Ideal_DU_postCCP(this); | |
1510 | |
1511 // TEMPORARY fix to ensure that 2nd GVN pass eliminates NULL checks | |
1512 switch( n->Opcode() ) { | |
1513 case Op_FastLock: // Revisit FastLocks for lock coarsening | |
1514 case Op_If: | |
1515 case Op_CountedLoopEnd: | |
1516 case Op_Region: | |
1517 case Op_Loop: | |
1518 case Op_CountedLoop: | |
1519 case Op_Conv2B: | |
1520 case Op_Opaque1: | |
1521 case Op_Opaque2: | |
1522 _worklist.push(n); | |
1523 break; | |
1524 default: | |
1525 break; | |
1526 } | |
1527 if( nn ) { | |
1528 _worklist.push(n); | |
1529 // Put users of 'n' onto worklist for second igvn transform | |
1530 add_users_to_worklist(n); | |
1531 return nn; | |
1532 } | |
1533 | |
1534 return n; | |
1535 } | |
1536 | |
1537 //---------------------------------saturate------------------------------------ | |
1538 const Type* PhaseCCP::saturate(const Type* new_type, const Type* old_type, | |
1539 const Type* limit_type) const { | |
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1540 const Type* wide_type = new_type->widen(old_type, limit_type); |
0 | 1541 if (wide_type != new_type) { // did we widen? |
1542 // If so, we may have widened beyond the limit type. Clip it back down. | |
1543 new_type = wide_type->filter(limit_type); | |
1544 } | |
1545 return new_type; | |
1546 } | |
1547 | |
1548 //------------------------------print_statistics------------------------------- | |
1549 #ifndef PRODUCT | |
1550 void PhaseCCP::print_statistics() { | |
1551 tty->print_cr("CCP: %d constants found: %d", _total_invokes, _total_constants); | |
1552 } | |
1553 #endif | |
1554 | |
1555 | |
1556 //============================================================================= | |
1557 #ifndef PRODUCT | |
1558 uint PhasePeephole::_total_peepholes = 0; | |
1559 #endif | |
1560 //------------------------------PhasePeephole---------------------------------- | |
1561 // Conditional Constant Propagation, ala Wegman & Zadeck | |
1562 PhasePeephole::PhasePeephole( PhaseRegAlloc *regalloc, PhaseCFG &cfg ) | |
1563 : PhaseTransform(Peephole), _regalloc(regalloc), _cfg(cfg) { | |
1564 NOT_PRODUCT( clear_peepholes(); ) | |
1565 } | |
1566 | |
1567 #ifndef PRODUCT | |
1568 //------------------------------~PhasePeephole--------------------------------- | |
1569 PhasePeephole::~PhasePeephole() { | |
1570 _total_peepholes += count_peepholes(); | |
1571 } | |
1572 #endif | |
1573 | |
1574 //------------------------------transform-------------------------------------- | |
1575 Node *PhasePeephole::transform( Node *n ) { | |
1576 ShouldNotCallThis(); | |
1577 return NULL; | |
1578 } | |
1579 | |
1580 //------------------------------do_transform----------------------------------- | |
1581 void PhasePeephole::do_transform() { | |
1582 bool method_name_not_printed = true; | |
1583 | |
1584 // Examine each basic block | |
1585 for( uint block_number = 1; block_number < _cfg._num_blocks; ++block_number ) { | |
1586 Block *block = _cfg._blocks[block_number]; | |
1587 bool block_not_printed = true; | |
1588 | |
1589 // and each instruction within a block | |
1590 uint end_index = block->_nodes.size(); | |
1591 // block->end_idx() not valid after PhaseRegAlloc | |
1592 for( uint instruction_index = 1; instruction_index < end_index; ++instruction_index ) { | |
1593 Node *n = block->_nodes.at(instruction_index); | |
1594 if( n->is_Mach() ) { | |
1595 MachNode *m = n->as_Mach(); | |
1596 int deleted_count = 0; | |
1597 // check for peephole opportunities | |
1598 MachNode *m2 = m->peephole( block, instruction_index, _regalloc, deleted_count, C ); | |
1599 if( m2 != NULL ) { | |
1600 #ifndef PRODUCT | |
1601 if( PrintOptoPeephole ) { | |
1602 // Print method, first time only | |
1603 if( C->method() && method_name_not_printed ) { | |
1604 C->method()->print_short_name(); tty->cr(); | |
1605 method_name_not_printed = false; | |
1606 } | |
1607 // Print this block | |
1608 if( Verbose && block_not_printed) { | |
1609 tty->print_cr("in block"); | |
1610 block->dump(); | |
1611 block_not_printed = false; | |
1612 } | |
1613 // Print instructions being deleted | |
1614 for( int i = (deleted_count - 1); i >= 0; --i ) { | |
1615 block->_nodes.at(instruction_index-i)->as_Mach()->format(_regalloc); tty->cr(); | |
1616 } | |
1617 tty->print_cr("replaced with"); | |
1618 // Print new instruction | |
1619 m2->format(_regalloc); | |
1620 tty->print("\n\n"); | |
1621 } | |
1622 #endif | |
1623 // Remove old nodes from basic block and update instruction_index | |
1624 // (old nodes still exist and may have edges pointing to them | |
1625 // as register allocation info is stored in the allocator using | |
1626 // the node index to live range mappings.) | |
1627 uint safe_instruction_index = (instruction_index - deleted_count); | |
1628 for( ; (instruction_index > safe_instruction_index); --instruction_index ) { | |
1629 block->_nodes.remove( instruction_index ); | |
1630 } | |
1631 // install new node after safe_instruction_index | |
1632 block->_nodes.insert( safe_instruction_index + 1, m2 ); | |
1633 end_index = block->_nodes.size() - 1; // Recompute new block size | |
1634 NOT_PRODUCT( inc_peepholes(); ) | |
1635 } | |
1636 } | |
1637 } | |
1638 } | |
1639 } | |
1640 | |
1641 //------------------------------print_statistics------------------------------- | |
1642 #ifndef PRODUCT | |
1643 void PhasePeephole::print_statistics() { | |
1644 tty->print_cr("Peephole: peephole rules applied: %d", _total_peepholes); | |
1645 } | |
1646 #endif | |
1647 | |
1648 | |
1649 //============================================================================= | |
1650 //------------------------------set_req_X-------------------------------------- | |
1651 void Node::set_req_X( uint i, Node *n, PhaseIterGVN *igvn ) { | |
1652 assert( is_not_dead(n), "can not use dead node"); | |
1653 assert( igvn->hash_find(this) != this, "Need to remove from hash before changing edges" ); | |
1654 Node *old = in(i); | |
1655 set_req(i, n); | |
1656 | |
1657 // old goes dead? | |
1658 if( old ) { | |
1659 switch (old->outcnt()) { | |
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1660 case 0: |
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1661 // Put into the worklist to kill later. We do not kill it now because the |
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1662 // recursive kill will delete the current node (this) if dead-loop exists |
0 | 1663 if (!old->is_top()) |
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1664 igvn->_worklist.push( old ); |
0 | 1665 break; |
1666 case 1: | |
1667 if( old->is_Store() || old->has_special_unique_user() ) | |
1668 igvn->add_users_to_worklist( old ); | |
1669 break; | |
1670 case 2: | |
1671 if( old->is_Store() ) | |
1672 igvn->add_users_to_worklist( old ); | |
1673 if( old->Opcode() == Op_Region ) | |
1674 igvn->_worklist.push(old); | |
1675 break; | |
1676 case 3: | |
1677 if( old->Opcode() == Op_Region ) { | |
1678 igvn->_worklist.push(old); | |
1679 igvn->add_users_to_worklist( old ); | |
1680 } | |
1681 break; | |
1682 default: | |
1683 break; | |
1684 } | |
1685 } | |
1686 | |
1687 } | |
1688 | |
1689 //-------------------------------replace_by----------------------------------- | |
1690 // Using def-use info, replace one node for another. Follow the def-use info | |
1691 // to all users of the OLD node. Then make all uses point to the NEW node. | |
1692 void Node::replace_by(Node *new_node) { | |
1693 assert(!is_top(), "top node has no DU info"); | |
1694 for (DUIterator_Last imin, i = last_outs(imin); i >= imin; ) { | |
1695 Node* use = last_out(i); | |
1696 uint uses_found = 0; | |
1697 for (uint j = 0; j < use->len(); j++) { | |
1698 if (use->in(j) == this) { | |
1699 if (j < use->req()) | |
1700 use->set_req(j, new_node); | |
1701 else use->set_prec(j, new_node); | |
1702 uses_found++; | |
1703 } | |
1704 } | |
1705 i -= uses_found; // we deleted 1 or more copies of this edge | |
1706 } | |
1707 } | |
1708 | |
1709 //============================================================================= | |
1710 //----------------------------------------------------------------------------- | |
1711 void Type_Array::grow( uint i ) { | |
1712 if( !_max ) { | |
1713 _max = 1; | |
1714 _types = (const Type**)_a->Amalloc( _max * sizeof(Type*) ); | |
1715 _types[0] = NULL; | |
1716 } | |
1717 uint old = _max; | |
1718 while( i >= _max ) _max <<= 1; // Double to fit | |
1719 _types = (const Type**)_a->Arealloc( _types, old*sizeof(Type*),_max*sizeof(Type*)); | |
1720 memset( &_types[old], 0, (_max-old)*sizeof(Type*) ); | |
1721 } | |
1722 | |
1723 //------------------------------dump------------------------------------------- | |
1724 #ifndef PRODUCT | |
1725 void Type_Array::dump() const { | |
1726 uint max = Size(); | |
1727 for( uint i = 0; i < max; i++ ) { | |
1728 if( _types[i] != NULL ) { | |
1729 tty->print(" %d\t== ", i); _types[i]->dump(); tty->cr(); | |
1730 } | |
1731 } | |
1732 } | |
1733 #endif |