Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/phaseX.cpp @ 23484:501f014415d8
8144487: PhaseIdealLoop::build_and_optimize() must restore major_progress flag if skip_loop_opts is true
Summary: Restore the major_progress flag before calling igvn.optimize().
Reviewed-by: kvn
author | thartmann |
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date | Mon, 21 Dec 2015 11:34:58 +0100 |
parents | 70649f10b88c |
children | b5f3a471e646 535618ab1c04 c42cb5db3601 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "memory/allocation.inline.hpp" | |
27 #include "opto/block.hpp" | |
28 #include "opto/callnode.hpp" | |
29 #include "opto/cfgnode.hpp" | |
30 #include "opto/connode.hpp" | |
31 #include "opto/idealGraphPrinter.hpp" | |
32 #include "opto/loopnode.hpp" | |
33 #include "opto/machnode.hpp" | |
34 #include "opto/opcodes.hpp" | |
35 #include "opto/phaseX.hpp" | |
36 #include "opto/regalloc.hpp" | |
37 #include "opto/rootnode.hpp" | |
0 | 38 |
39 //============================================================================= | |
40 #define NODE_HASH_MINIMUM_SIZE 255 | |
41 //------------------------------NodeHash--------------------------------------- | |
42 NodeHash::NodeHash(uint est_max_size) : | |
43 _max( round_up(est_max_size < NODE_HASH_MINIMUM_SIZE ? NODE_HASH_MINIMUM_SIZE : est_max_size) ), | |
44 _a(Thread::current()->resource_area()), | |
45 _table( NEW_ARENA_ARRAY( _a , Node* , _max ) ), // (Node**)_a->Amalloc(_max * sizeof(Node*)) ), | |
46 _inserts(0), _insert_limit( insert_limit() ), | |
47 _look_probes(0), _lookup_hits(0), _lookup_misses(0), | |
48 _total_insert_probes(0), _total_inserts(0), | |
49 _insert_probes(0), _grows(0) { | |
50 // _sentinel must be in the current node space | |
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51 _sentinel = new (Compile::current()) ProjNode(NULL, TypeFunc::Control); |
0 | 52 memset(_table,0,sizeof(Node*)*_max); |
53 } | |
54 | |
55 //------------------------------NodeHash--------------------------------------- | |
56 NodeHash::NodeHash(Arena *arena, uint est_max_size) : | |
57 _max( round_up(est_max_size < NODE_HASH_MINIMUM_SIZE ? NODE_HASH_MINIMUM_SIZE : est_max_size) ), | |
58 _a(arena), | |
59 _table( NEW_ARENA_ARRAY( _a , Node* , _max ) ), | |
60 _inserts(0), _insert_limit( insert_limit() ), | |
61 _look_probes(0), _lookup_hits(0), _lookup_misses(0), | |
62 _delete_probes(0), _delete_hits(0), _delete_misses(0), | |
63 _total_insert_probes(0), _total_inserts(0), | |
64 _insert_probes(0), _grows(0) { | |
65 // _sentinel must be in the current node space | |
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66 _sentinel = new (Compile::current()) ProjNode(NULL, TypeFunc::Control); |
0 | 67 memset(_table,0,sizeof(Node*)*_max); |
68 } | |
69 | |
70 //------------------------------NodeHash--------------------------------------- | |
71 NodeHash::NodeHash(NodeHash *nh) { | |
72 debug_only(_table = (Node**)badAddress); // interact correctly w/ operator= | |
73 // just copy in all the fields | |
74 *this = *nh; | |
75 // nh->_sentinel must be in the current node space | |
76 } | |
77 | |
7473 | 78 void NodeHash::replace_with(NodeHash *nh) { |
79 debug_only(_table = (Node**)badAddress); // interact correctly w/ operator= | |
80 // just copy in all the fields | |
81 *this = *nh; | |
82 // nh->_sentinel must be in the current node space | |
83 } | |
84 | |
0 | 85 //------------------------------hash_find-------------------------------------- |
86 // Find in hash table | |
87 Node *NodeHash::hash_find( const Node *n ) { | |
88 // ((Node*)n)->set_hash( n->hash() ); | |
89 uint hash = n->hash(); | |
90 if (hash == Node::NO_HASH) { | |
91 debug_only( _lookup_misses++ ); | |
92 return NULL; | |
93 } | |
94 uint key = hash & (_max-1); | |
95 uint stride = key | 0x01; | |
96 debug_only( _look_probes++ ); | |
97 Node *k = _table[key]; // Get hashed value | |
98 if( !k ) { // ?Miss? | |
99 debug_only( _lookup_misses++ ); | |
100 return NULL; // Miss! | |
101 } | |
102 | |
103 int op = n->Opcode(); | |
104 uint req = n->req(); | |
105 while( 1 ) { // While probing hash table | |
106 if( k->req() == req && // Same count of inputs | |
107 k->Opcode() == op ) { // Same Opcode | |
108 for( uint i=0; i<req; i++ ) | |
109 if( n->in(i)!=k->in(i)) // Different inputs? | |
110 goto collision; // "goto" is a speed hack... | |
111 if( n->cmp(*k) ) { // Check for any special bits | |
112 debug_only( _lookup_hits++ ); | |
113 return k; // Hit! | |
114 } | |
115 } | |
116 collision: | |
117 debug_only( _look_probes++ ); | |
118 key = (key + stride/*7*/) & (_max-1); // Stride through table with relative prime | |
119 k = _table[key]; // Get hashed value | |
120 if( !k ) { // ?Miss? | |
121 debug_only( _lookup_misses++ ); | |
122 return NULL; // Miss! | |
123 } | |
124 } | |
125 ShouldNotReachHere(); | |
126 return NULL; | |
127 } | |
128 | |
129 //------------------------------hash_find_insert------------------------------- | |
130 // Find in hash table, insert if not already present | |
131 // Used to preserve unique entries in hash table | |
132 Node *NodeHash::hash_find_insert( Node *n ) { | |
133 // n->set_hash( ); | |
134 uint hash = n->hash(); | |
135 if (hash == Node::NO_HASH) { | |
136 debug_only( _lookup_misses++ ); | |
137 return NULL; | |
138 } | |
139 uint key = hash & (_max-1); | |
140 uint stride = key | 0x01; // stride must be relatively prime to table siz | |
141 uint first_sentinel = 0; // replace a sentinel if seen. | |
142 debug_only( _look_probes++ ); | |
143 Node *k = _table[key]; // Get hashed value | |
144 if( !k ) { // ?Miss? | |
145 debug_only( _lookup_misses++ ); | |
146 _table[key] = n; // Insert into table! | |
147 debug_only(n->enter_hash_lock()); // Lock down the node while in the table. | |
148 check_grow(); // Grow table if insert hit limit | |
149 return NULL; // Miss! | |
150 } | |
151 else if( k == _sentinel ) { | |
152 first_sentinel = key; // Can insert here | |
153 } | |
154 | |
155 int op = n->Opcode(); | |
156 uint req = n->req(); | |
157 while( 1 ) { // While probing hash table | |
158 if( k->req() == req && // Same count of inputs | |
159 k->Opcode() == op ) { // Same Opcode | |
160 for( uint i=0; i<req; i++ ) | |
161 if( n->in(i)!=k->in(i)) // Different inputs? | |
162 goto collision; // "goto" is a speed hack... | |
163 if( n->cmp(*k) ) { // Check for any special bits | |
164 debug_only( _lookup_hits++ ); | |
165 return k; // Hit! | |
166 } | |
167 } | |
168 collision: | |
169 debug_only( _look_probes++ ); | |
170 key = (key + stride) & (_max-1); // Stride through table w/ relative prime | |
171 k = _table[key]; // Get hashed value | |
172 if( !k ) { // ?Miss? | |
173 debug_only( _lookup_misses++ ); | |
174 key = (first_sentinel == 0) ? key : first_sentinel; // ?saw sentinel? | |
175 _table[key] = n; // Insert into table! | |
176 debug_only(n->enter_hash_lock()); // Lock down the node while in the table. | |
177 check_grow(); // Grow table if insert hit limit | |
178 return NULL; // Miss! | |
179 } | |
180 else if( first_sentinel == 0 && k == _sentinel ) { | |
181 first_sentinel = key; // Can insert here | |
182 } | |
183 | |
184 } | |
185 ShouldNotReachHere(); | |
186 return NULL; | |
187 } | |
188 | |
189 //------------------------------hash_insert------------------------------------ | |
190 // Insert into hash table | |
191 void NodeHash::hash_insert( Node *n ) { | |
192 // // "conflict" comments -- print nodes that conflict | |
193 // bool conflict = false; | |
194 // n->set_hash(); | |
195 uint hash = n->hash(); | |
196 if (hash == Node::NO_HASH) { | |
197 return; | |
198 } | |
199 check_grow(); | |
200 uint key = hash & (_max-1); | |
201 uint stride = key | 0x01; | |
202 | |
203 while( 1 ) { // While probing hash table | |
204 debug_only( _insert_probes++ ); | |
205 Node *k = _table[key]; // Get hashed value | |
206 if( !k || (k == _sentinel) ) break; // Found a slot | |
207 assert( k != n, "already inserted" ); | |
208 // if( PrintCompilation && PrintOptoStatistics && Verbose ) { tty->print(" conflict: "); k->dump(); conflict = true; } | |
209 key = (key + stride) & (_max-1); // Stride through table w/ relative prime | |
210 } | |
211 _table[key] = n; // Insert into table! | |
212 debug_only(n->enter_hash_lock()); // Lock down the node while in the table. | |
213 // if( conflict ) { n->dump(); } | |
214 } | |
215 | |
216 //------------------------------hash_delete------------------------------------ | |
605 | 217 // Replace in hash table with sentinel |
0 | 218 bool NodeHash::hash_delete( const Node *n ) { |
219 Node *k; | |
220 uint hash = n->hash(); | |
221 if (hash == Node::NO_HASH) { | |
222 debug_only( _delete_misses++ ); | |
223 return false; | |
224 } | |
225 uint key = hash & (_max-1); | |
226 uint stride = key | 0x01; | |
227 debug_only( uint counter = 0; ); | |
605 | 228 for( ; /* (k != NULL) && (k != _sentinel) */; ) { |
0 | 229 debug_only( counter++ ); |
230 debug_only( _delete_probes++ ); | |
231 k = _table[key]; // Get hashed value | |
232 if( !k ) { // Miss? | |
233 debug_only( _delete_misses++ ); | |
234 #ifdef ASSERT | |
235 if( VerifyOpto ) { | |
236 for( uint i=0; i < _max; i++ ) | |
237 assert( _table[i] != n, "changed edges with rehashing" ); | |
238 } | |
239 #endif | |
240 return false; // Miss! Not in chain | |
241 } | |
242 else if( n == k ) { | |
243 debug_only( _delete_hits++ ); | |
244 _table[key] = _sentinel; // Hit! Label as deleted entry | |
245 debug_only(((Node*)n)->exit_hash_lock()); // Unlock the node upon removal from table. | |
246 return true; | |
247 } | |
248 else { | |
249 // collision: move through table with prime offset | |
250 key = (key + stride/*7*/) & (_max-1); | |
251 assert( counter <= _insert_limit, "Cycle in hash-table"); | |
252 } | |
253 } | |
254 ShouldNotReachHere(); | |
255 return false; | |
256 } | |
257 | |
258 //------------------------------round_up--------------------------------------- | |
259 // Round up to nearest power of 2 | |
260 uint NodeHash::round_up( uint x ) { | |
261 x += (x>>2); // Add 25% slop | |
262 if( x <16 ) return 16; // Small stuff | |
263 uint i=16; | |
264 while( i < x ) i <<= 1; // Double to fit | |
265 return i; // Return hash table size | |
266 } | |
267 | |
268 //------------------------------grow------------------------------------------- | |
269 // Grow _table to next power of 2 and insert old entries | |
270 void NodeHash::grow() { | |
271 // Record old state | |
272 uint old_max = _max; | |
273 Node **old_table = _table; | |
274 // Construct new table with twice the space | |
275 _grows++; | |
276 _total_inserts += _inserts; | |
277 _total_insert_probes += _insert_probes; | |
278 _inserts = 0; | |
279 _insert_probes = 0; | |
280 _max = _max << 1; | |
281 _table = NEW_ARENA_ARRAY( _a , Node* , _max ); // (Node**)_a->Amalloc( _max * sizeof(Node*) ); | |
282 memset(_table,0,sizeof(Node*)*_max); | |
283 _insert_limit = insert_limit(); | |
284 // Insert old entries into the new table | |
285 for( uint i = 0; i < old_max; i++ ) { | |
286 Node *m = *old_table++; | |
287 if( !m || m == _sentinel ) continue; | |
288 debug_only(m->exit_hash_lock()); // Unlock the node upon removal from old table. | |
289 hash_insert(m); | |
290 } | |
291 } | |
292 | |
293 //------------------------------clear------------------------------------------ | |
294 // Clear all entries in _table to NULL but keep storage | |
295 void NodeHash::clear() { | |
296 #ifdef ASSERT | |
297 // Unlock all nodes upon removal from table. | |
298 for (uint i = 0; i < _max; i++) { | |
299 Node* n = _table[i]; | |
300 if (!n || n == _sentinel) continue; | |
301 n->exit_hash_lock(); | |
302 } | |
303 #endif | |
304 | |
305 memset( _table, 0, _max * sizeof(Node*) ); | |
306 } | |
307 | |
308 //-----------------------remove_useless_nodes---------------------------------- | |
309 // Remove useless nodes from value table, | |
310 // implementation does not depend on hash function | |
311 void NodeHash::remove_useless_nodes(VectorSet &useful) { | |
312 | |
313 // Dead nodes in the hash table inherited from GVN should not replace | |
314 // existing nodes, remove dead nodes. | |
315 uint max = size(); | |
316 Node *sentinel_node = sentinel(); | |
317 for( uint i = 0; i < max; ++i ) { | |
318 Node *n = at(i); | |
319 if(n != NULL && n != sentinel_node && !useful.test(n->_idx)) { | |
320 debug_only(n->exit_hash_lock()); // Unlock the node when removed | |
321 _table[i] = sentinel_node; // Replace with placeholder | |
322 } | |
323 } | |
324 } | |
325 | |
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326 |
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327 void NodeHash::check_no_speculative_types() { |
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328 #ifdef ASSERT |
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329 uint max = size(); |
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330 Node *sentinel_node = sentinel(); |
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331 for (uint i = 0; i < max; ++i) { |
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332 Node *n = at(i); |
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333 if(n != NULL && n != sentinel_node && n->is_Type()) { |
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334 TypeNode* tn = n->as_Type(); |
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335 const Type* t = tn->type(); |
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336 const Type* t_no_spec = t->remove_speculative(); |
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337 assert(t == t_no_spec, "dead node in hash table or missed node during speculative cleanup"); |
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338 } |
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339 } |
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340 #endif |
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341 } |
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342 |
0 | 343 #ifndef PRODUCT |
344 //------------------------------dump------------------------------------------- | |
345 // Dump statistics for the hash table | |
346 void NodeHash::dump() { | |
347 _total_inserts += _inserts; | |
348 _total_insert_probes += _insert_probes; | |
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349 if (PrintCompilation && PrintOptoStatistics && Verbose && (_inserts > 0)) { |
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350 if (WizardMode) { |
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351 for (uint i=0; i<_max; i++) { |
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352 if (_table[i]) |
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353 tty->print("%d/%d/%d ",i,_table[i]->hash()&(_max-1),_table[i]->_idx); |
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354 } |
0 | 355 } |
356 tty->print("\nGVN Hash stats: %d grows to %d max_size\n", _grows, _max); | |
357 tty->print(" %d/%d (%8.1f%% full)\n", _inserts, _max, (double)_inserts/_max*100.0); | |
358 tty->print(" %dp/(%dh+%dm) (%8.2f probes/lookup)\n", _look_probes, _lookup_hits, _lookup_misses, (double)_look_probes/(_lookup_hits+_lookup_misses)); | |
359 tty->print(" %dp/%di (%8.2f probes/insert)\n", _total_insert_probes, _total_inserts, (double)_total_insert_probes/_total_inserts); | |
360 // sentinels increase lookup cost, but not insert cost | |
361 assert((_lookup_misses+_lookup_hits)*4+100 >= _look_probes, "bad hash function"); | |
362 assert( _inserts+(_inserts>>3) < _max, "table too full" ); | |
363 assert( _inserts*3+100 >= _insert_probes, "bad hash function" ); | |
364 } | |
365 } | |
366 | |
367 Node *NodeHash::find_index(uint idx) { // For debugging | |
368 // Find an entry by its index value | |
369 for( uint i = 0; i < _max; i++ ) { | |
370 Node *m = _table[i]; | |
371 if( !m || m == _sentinel ) continue; | |
372 if( m->_idx == (uint)idx ) return m; | |
373 } | |
374 return NULL; | |
375 } | |
376 #endif | |
377 | |
378 #ifdef ASSERT | |
379 NodeHash::~NodeHash() { | |
380 // Unlock all nodes upon destruction of table. | |
381 if (_table != (Node**)badAddress) clear(); | |
382 } | |
383 | |
384 void NodeHash::operator=(const NodeHash& nh) { | |
385 // Unlock all nodes upon replacement of table. | |
386 if (&nh == this) return; | |
387 if (_table != (Node**)badAddress) clear(); | |
388 memcpy(this, &nh, sizeof(*this)); | |
389 // Do not increment hash_lock counts again. | |
390 // Instead, be sure we never again use the source table. | |
391 ((NodeHash*)&nh)->_table = (Node**)badAddress; | |
392 } | |
393 | |
394 | |
395 #endif | |
396 | |
397 | |
398 //============================================================================= | |
399 //------------------------------PhaseRemoveUseless----------------------------- | |
400 // 1) Use a breadthfirst walk to collect useful nodes reachable from root. | |
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401 PhaseRemoveUseless::PhaseRemoveUseless(PhaseGVN *gvn, Unique_Node_List *worklist, PhaseNumber phase_num) : Phase(phase_num), |
0 | 402 _useful(Thread::current()->resource_area()) { |
403 | |
404 // Implementation requires 'UseLoopSafepoints == true' and an edge from root | |
405 // to each SafePointNode at a backward branch. Inserted in add_safepoint(). | |
406 if( !UseLoopSafepoints || !OptoRemoveUseless ) return; | |
407 | |
408 // Identify nodes that are reachable from below, useful. | |
409 C->identify_useful_nodes(_useful); | |
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410 // Update dead node list |
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411 C->update_dead_node_list(_useful); |
0 | 412 |
413 // Remove all useless nodes from PhaseValues' recorded types | |
414 // Must be done before disconnecting nodes to preserve hash-table-invariant | |
415 gvn->remove_useless_nodes(_useful.member_set()); | |
416 | |
417 // Remove all useless nodes from future worklist | |
418 worklist->remove_useless_nodes(_useful.member_set()); | |
419 | |
420 // Disconnect 'useless' nodes that are adjacent to useful nodes | |
421 C->remove_useless_nodes(_useful); | |
422 | |
423 // Remove edges from "root" to each SafePoint at a backward branch. | |
424 // They were inserted during parsing (see add_safepoint()) to make infinite | |
425 // loops without calls or exceptions visible to root, i.e., useful. | |
426 Node *root = C->root(); | |
427 if( root != NULL ) { | |
428 for( uint i = root->req(); i < root->len(); ++i ) { | |
429 Node *n = root->in(i); | |
430 if( n != NULL && n->is_SafePoint() ) { | |
431 root->rm_prec(i); | |
432 --i; | |
433 } | |
434 } | |
435 } | |
436 } | |
437 | |
23471
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438 //============================================================================= |
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439 //------------------------------PhaseRenumberLive------------------------------ |
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440 // First, remove useless nodes (equivalent to identifying live nodes). |
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441 // Then, renumber live nodes. |
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442 // |
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443 // The set of live nodes is returned by PhaseRemoveUseless in the _useful structure. |
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444 // If the number of live nodes is 'x' (where 'x' == _useful.size()), then the |
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445 // PhaseRenumberLive updates the node ID of each node (the _idx field) with a unique |
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446 // value in the range [0, x). |
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447 // |
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448 // At the end of the PhaseRenumberLive phase, the compiler's count of unique nodes is |
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449 // updated to 'x' and the list of dead nodes is reset (as there are no dead nodes). |
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450 // |
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451 // The PhaseRenumberLive phase updates two data structures with the new node IDs. |
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452 // (1) The worklist is used by the PhaseIterGVN phase to identify nodes that must be |
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453 // processed. A new worklist (with the updated node IDs) is returned in 'new_worklist'. |
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454 // (2) Type information (the field PhaseGVN::_types) maps type information to each |
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455 // node ID. The mapping is updated to use the new node IDs as well. Updated type |
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456 // information is returned in PhaseGVN::_types. |
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457 // |
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458 // The PhaseRenumberLive phase does not preserve the order of elements in the worklist. |
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459 // |
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460 // Other data structures used by the compiler are not updated. The hash table for value |
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461 // numbering (the field PhaseGVN::_table) is not updated because computing the hash |
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462 // values is not based on node IDs. The field PhaseGVN::_nodes is not updated either |
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463 // because it is empty wherever PhaseRenumberLive is used. |
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464 PhaseRenumberLive::PhaseRenumberLive(PhaseGVN* gvn, |
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465 Unique_Node_List* worklist, Unique_Node_List* new_worklist, |
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466 PhaseNumber phase_num) : |
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467 PhaseRemoveUseless(gvn, worklist, Remove_Useless_And_Renumber_Live) { |
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468 |
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469 assert(RenumberLiveNodes, "RenumberLiveNodes must be set to true for node renumbering to take place"); |
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470 assert(C->live_nodes() == _useful.size(), "the number of live nodes must match the number of useful nodes"); |
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471 assert(gvn->nodes_size() == 0, "GVN must not contain any nodes at this point"); |
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472 |
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473 uint old_unique_count = C->unique(); |
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474 uint live_node_count = C->live_nodes(); |
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475 uint worklist_size = worklist->size(); |
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476 |
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477 // Storage for the updated type information. |
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478 Type_Array new_type_array(C->comp_arena()); |
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479 |
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480 // Iterate over the set of live nodes. |
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481 uint current_idx = 0; // The current new node ID. Incremented after every assignment. |
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482 for (uint i = 0; i < _useful.size(); i++) { |
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483 Node* n = _useful.at(i); |
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484 const Type* type = gvn->type_or_null(n); |
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485 new_type_array.map(current_idx, type); |
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486 |
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487 bool in_worklist = false; |
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488 if (worklist->member(n)) { |
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489 in_worklist = true; |
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490 } |
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491 |
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492 n->set_idx(current_idx); // Update node ID. |
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493 |
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494 if (in_worklist) { |
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495 new_worklist->push(n); |
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496 } |
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497 |
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498 current_idx++; |
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499 } |
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500 |
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501 assert(worklist_size == new_worklist->size(), "the new worklist must have the same size as the original worklist"); |
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502 assert(live_node_count == current_idx, "all live nodes must be processed"); |
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503 |
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504 // Replace the compiler's type information with the updated type information. |
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505 gvn->replace_types(new_type_array); |
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506 |
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507 // Update the unique node count of the compilation to the number of currently live nodes. |
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508 C->set_unique(live_node_count); |
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509 |
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510 // Set the dead node count to 0 and reset dead node list. |
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511 C->reset_dead_node_list(); |
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512 } |
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513 |
0 | 514 |
515 //============================================================================= | |
516 //------------------------------PhaseTransform--------------------------------- | |
517 PhaseTransform::PhaseTransform( PhaseNumber pnum ) : Phase(pnum), | |
518 _arena(Thread::current()->resource_area()), | |
519 _nodes(_arena), | |
520 _types(_arena) | |
521 { | |
522 init_con_caches(); | |
523 #ifndef PRODUCT | |
524 clear_progress(); | |
525 clear_transforms(); | |
526 set_allow_progress(true); | |
527 #endif | |
528 // Force allocation for currently existing nodes | |
529 _types.map(C->unique(), NULL); | |
530 } | |
531 | |
532 //------------------------------PhaseTransform--------------------------------- | |
533 PhaseTransform::PhaseTransform( Arena *arena, PhaseNumber pnum ) : Phase(pnum), | |
534 _arena(arena), | |
535 _nodes(arena), | |
536 _types(arena) | |
537 { | |
538 init_con_caches(); | |
539 #ifndef PRODUCT | |
540 clear_progress(); | |
541 clear_transforms(); | |
542 set_allow_progress(true); | |
543 #endif | |
544 // Force allocation for currently existing nodes | |
545 _types.map(C->unique(), NULL); | |
546 } | |
547 | |
548 //------------------------------PhaseTransform--------------------------------- | |
549 // Initialize with previously generated type information | |
550 PhaseTransform::PhaseTransform( PhaseTransform *pt, PhaseNumber pnum ) : Phase(pnum), | |
551 _arena(pt->_arena), | |
552 _nodes(pt->_nodes), | |
553 _types(pt->_types) | |
554 { | |
555 init_con_caches(); | |
556 #ifndef PRODUCT | |
557 clear_progress(); | |
558 clear_transforms(); | |
559 set_allow_progress(true); | |
560 #endif | |
561 } | |
562 | |
563 void PhaseTransform::init_con_caches() { | |
564 memset(_icons,0,sizeof(_icons)); | |
565 memset(_lcons,0,sizeof(_lcons)); | |
566 memset(_zcons,0,sizeof(_zcons)); | |
567 } | |
568 | |
569 | |
570 //--------------------------------find_int_type-------------------------------- | |
571 const TypeInt* PhaseTransform::find_int_type(Node* n) { | |
572 if (n == NULL) return NULL; | |
573 // Call type_or_null(n) to determine node's type since we might be in | |
574 // parse phase and call n->Value() may return wrong type. | |
575 // (For example, a phi node at the beginning of loop parsing is not ready.) | |
576 const Type* t = type_or_null(n); | |
577 if (t == NULL) return NULL; | |
578 return t->isa_int(); | |
579 } | |
580 | |
581 | |
582 //-------------------------------find_long_type-------------------------------- | |
583 const TypeLong* PhaseTransform::find_long_type(Node* n) { | |
584 if (n == NULL) return NULL; | |
585 // (See comment above on type_or_null.) | |
586 const Type* t = type_or_null(n); | |
587 if (t == NULL) return NULL; | |
588 return t->isa_long(); | |
589 } | |
590 | |
591 | |
592 #ifndef PRODUCT | |
593 void PhaseTransform::dump_old2new_map() const { | |
594 _nodes.dump(); | |
595 } | |
596 | |
597 void PhaseTransform::dump_new( uint nidx ) const { | |
598 for( uint i=0; i<_nodes.Size(); i++ ) | |
599 if( _nodes[i] && _nodes[i]->_idx == nidx ) { | |
600 _nodes[i]->dump(); | |
601 tty->cr(); | |
602 tty->print_cr("Old index= %d",i); | |
603 return; | |
604 } | |
605 tty->print_cr("Node %d not found in the new indices", nidx); | |
606 } | |
607 | |
608 //------------------------------dump_types------------------------------------- | |
609 void PhaseTransform::dump_types( ) const { | |
610 _types.dump(); | |
611 } | |
612 | |
613 //------------------------------dump_nodes_and_types--------------------------- | |
614 void PhaseTransform::dump_nodes_and_types(const Node *root, uint depth, bool only_ctrl) { | |
615 VectorSet visited(Thread::current()->resource_area()); | |
616 dump_nodes_and_types_recur( root, depth, only_ctrl, visited ); | |
617 } | |
618 | |
619 //------------------------------dump_nodes_and_types_recur--------------------- | |
620 void PhaseTransform::dump_nodes_and_types_recur( const Node *n, uint depth, bool only_ctrl, VectorSet &visited) { | |
621 if( !n ) return; | |
622 if( depth == 0 ) return; | |
623 if( visited.test_set(n->_idx) ) return; | |
624 for( uint i=0; i<n->len(); i++ ) { | |
625 if( only_ctrl && !(n->is_Region()) && i != TypeFunc::Control ) continue; | |
626 dump_nodes_and_types_recur( n->in(i), depth-1, only_ctrl, visited ); | |
627 } | |
628 n->dump(); | |
629 if (type_or_null(n) != NULL) { | |
630 tty->print(" "); type(n)->dump(); tty->cr(); | |
631 } | |
632 } | |
633 | |
634 #endif | |
635 | |
636 | |
637 //============================================================================= | |
638 //------------------------------PhaseValues------------------------------------ | |
639 // Set minimum table size to "255" | |
640 PhaseValues::PhaseValues( Arena *arena, uint est_max_size ) : PhaseTransform(arena, GVN), _table(arena, est_max_size) { | |
641 NOT_PRODUCT( clear_new_values(); ) | |
642 } | |
643 | |
644 //------------------------------PhaseValues------------------------------------ | |
645 // Set minimum table size to "255" | |
646 PhaseValues::PhaseValues( PhaseValues *ptv ) : PhaseTransform( ptv, GVN ), | |
647 _table(&ptv->_table) { | |
648 NOT_PRODUCT( clear_new_values(); ) | |
649 } | |
650 | |
651 //------------------------------PhaseValues------------------------------------ | |
652 // Used by +VerifyOpto. Clear out hash table but copy _types array. | |
653 PhaseValues::PhaseValues( PhaseValues *ptv, const char *dummy ) : PhaseTransform( ptv, GVN ), | |
654 _table(ptv->arena(),ptv->_table.size()) { | |
655 NOT_PRODUCT( clear_new_values(); ) | |
656 } | |
657 | |
658 //------------------------------~PhaseValues----------------------------------- | |
659 #ifndef PRODUCT | |
660 PhaseValues::~PhaseValues() { | |
661 _table.dump(); | |
662 | |
663 // Statistics for value progress and efficiency | |
664 if( PrintCompilation && Verbose && WizardMode ) { | |
665 tty->print("\n%sValues: %d nodes ---> %d/%d (%d)", | |
666 is_IterGVN() ? "Iter" : " ", C->unique(), made_progress(), made_transforms(), made_new_values()); | |
667 if( made_transforms() != 0 ) { | |
668 tty->print_cr(" ratio %f", made_progress()/(float)made_transforms() ); | |
669 } else { | |
670 tty->cr(); | |
671 } | |
672 } | |
673 } | |
674 #endif | |
675 | |
676 //------------------------------makecon---------------------------------------- | |
677 ConNode* PhaseTransform::makecon(const Type *t) { | |
678 assert(t->singleton(), "must be a constant"); | |
679 assert(!t->empty() || t == Type::TOP, "must not be vacuous range"); | |
680 switch (t->base()) { // fast paths | |
681 case Type::Half: | |
682 case Type::Top: return (ConNode*) C->top(); | |
683 case Type::Int: return intcon( t->is_int()->get_con() ); | |
684 case Type::Long: return longcon( t->is_long()->get_con() ); | |
685 } | |
686 if (t->is_zero_type()) | |
687 return zerocon(t->basic_type()); | |
688 return uncached_makecon(t); | |
689 } | |
690 | |
691 //--------------------------uncached_makecon----------------------------------- | |
692 // Make an idealized constant - one of ConINode, ConPNode, etc. | |
693 ConNode* PhaseValues::uncached_makecon(const Type *t) { | |
694 assert(t->singleton(), "must be a constant"); | |
695 ConNode* x = ConNode::make(C, t); | |
696 ConNode* k = (ConNode*)hash_find_insert(x); // Value numbering | |
697 if (k == NULL) { | |
698 set_type(x, t); // Missed, provide type mapping | |
699 GrowableArray<Node_Notes*>* nna = C->node_note_array(); | |
700 if (nna != NULL) { | |
701 Node_Notes* loc = C->locate_node_notes(nna, x->_idx, true); | |
702 loc->clear(); // do not put debug info on constants | |
703 } | |
704 } else { | |
705 x->destruct(); // Hit, destroy duplicate constant | |
706 x = k; // use existing constant | |
707 } | |
708 return x; | |
709 } | |
710 | |
711 //------------------------------intcon----------------------------------------- | |
712 // Fast integer constant. Same as "transform(new ConINode(TypeInt::make(i)))" | |
713 ConINode* PhaseTransform::intcon(int i) { | |
714 // Small integer? Check cache! Check that cached node is not dead | |
715 if (i >= _icon_min && i <= _icon_max) { | |
716 ConINode* icon = _icons[i-_icon_min]; | |
717 if (icon != NULL && icon->in(TypeFunc::Control) != NULL) | |
718 return icon; | |
719 } | |
720 ConINode* icon = (ConINode*) uncached_makecon(TypeInt::make(i)); | |
721 assert(icon->is_Con(), ""); | |
722 if (i >= _icon_min && i <= _icon_max) | |
723 _icons[i-_icon_min] = icon; // Cache small integers | |
724 return icon; | |
725 } | |
726 | |
727 //------------------------------longcon---------------------------------------- | |
728 // Fast long constant. | |
729 ConLNode* PhaseTransform::longcon(jlong l) { | |
730 // Small integer? Check cache! Check that cached node is not dead | |
731 if (l >= _lcon_min && l <= _lcon_max) { | |
732 ConLNode* lcon = _lcons[l-_lcon_min]; | |
733 if (lcon != NULL && lcon->in(TypeFunc::Control) != NULL) | |
734 return lcon; | |
735 } | |
736 ConLNode* lcon = (ConLNode*) uncached_makecon(TypeLong::make(l)); | |
737 assert(lcon->is_Con(), ""); | |
738 if (l >= _lcon_min && l <= _lcon_max) | |
739 _lcons[l-_lcon_min] = lcon; // Cache small integers | |
740 return lcon; | |
741 } | |
742 | |
743 //------------------------------zerocon----------------------------------------- | |
744 // Fast zero or null constant. Same as "transform(ConNode::make(Type::get_zero_type(bt)))" | |
745 ConNode* PhaseTransform::zerocon(BasicType bt) { | |
746 assert((uint)bt <= _zcon_max, "domain check"); | |
747 ConNode* zcon = _zcons[bt]; | |
748 if (zcon != NULL && zcon->in(TypeFunc::Control) != NULL) | |
749 return zcon; | |
750 zcon = (ConNode*) uncached_makecon(Type::get_zero_type(bt)); | |
751 _zcons[bt] = zcon; | |
752 return zcon; | |
753 } | |
754 | |
755 | |
756 | |
757 //============================================================================= | |
758 //------------------------------transform-------------------------------------- | |
759 // Return a node which computes the same function as this node, but in a | |
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760 // faster or cheaper fashion. |
0 | 761 Node *PhaseGVN::transform( Node *n ) { |
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762 return transform_no_reclaim(n); |
0 | 763 } |
764 | |
765 //------------------------------transform-------------------------------------- | |
766 // Return a node which computes the same function as this node, but | |
767 // in a faster or cheaper fashion. | |
768 Node *PhaseGVN::transform_no_reclaim( Node *n ) { | |
769 NOT_PRODUCT( set_transforms(); ) | |
770 | |
771 // Apply the Ideal call in a loop until it no longer applies | |
772 Node *k = n; | |
773 NOT_PRODUCT( uint loop_count = 0; ) | |
774 while( 1 ) { | |
775 Node *i = k->Ideal(this, /*can_reshape=*/false); | |
776 if( !i ) break; | |
777 assert( i->_idx >= k->_idx, "Idealize should return new nodes, use Identity to return old nodes" ); | |
778 k = i; | |
779 assert(loop_count++ < K, "infinite loop in PhaseGVN::transform"); | |
780 } | |
781 NOT_PRODUCT( if( loop_count != 0 ) { set_progress(); } ) | |
782 | |
783 | |
784 // If brand new node, make space in type array. | |
785 ensure_type_or_null(k); | |
786 | |
787 // Since I just called 'Value' to compute the set of run-time values | |
788 // for this Node, and 'Value' is non-local (and therefore expensive) I'll | |
789 // cache Value. Later requests for the local phase->type of this Node can | |
790 // use the cached Value instead of suffering with 'bottom_type'. | |
791 const Type *t = k->Value(this); // Get runtime Value set | |
792 assert(t != NULL, "value sanity"); | |
793 if (type_or_null(k) != t) { | |
794 #ifndef PRODUCT | |
795 // Do not count initial visit to node as a transformation | |
796 if (type_or_null(k) == NULL) { | |
797 inc_new_values(); | |
798 set_progress(); | |
799 } | |
800 #endif | |
801 set_type(k, t); | |
802 // If k is a TypeNode, capture any more-precise type permanently into Node | |
803 k->raise_bottom_type(t); | |
804 } | |
805 | |
806 if( t->singleton() && !k->is_Con() ) { | |
807 NOT_PRODUCT( set_progress(); ) | |
808 return makecon(t); // Turn into a constant | |
809 } | |
810 | |
811 // Now check for Identities | |
812 Node *i = k->Identity(this); // Look for a nearby replacement | |
813 if( i != k ) { // Found? Return replacement! | |
814 NOT_PRODUCT( set_progress(); ) | |
815 return i; | |
816 } | |
817 | |
818 // Global Value Numbering | |
819 i = hash_find_insert(k); // Insert if new | |
820 if( i && (i != k) ) { | |
821 // Return the pre-existing node | |
822 NOT_PRODUCT( set_progress(); ) | |
823 return i; | |
824 } | |
825 | |
826 // Return Idealized original | |
827 return k; | |
828 } | |
829 | |
830 #ifdef ASSERT | |
831 //------------------------------dead_loop_check-------------------------------- | |
605 | 832 // Check for a simple dead loop when a data node references itself directly |
0 | 833 // or through an other data node excluding cons and phis. |
834 void PhaseGVN::dead_loop_check( Node *n ) { | |
835 // Phi may reference itself in a loop | |
836 if (n != NULL && !n->is_dead_loop_safe() && !n->is_CFG()) { | |
837 // Do 2 levels check and only data inputs. | |
838 bool no_dead_loop = true; | |
839 uint cnt = n->req(); | |
840 for (uint i = 1; i < cnt && no_dead_loop; i++) { | |
841 Node *in = n->in(i); | |
842 if (in == n) { | |
843 no_dead_loop = false; | |
844 } else if (in != NULL && !in->is_dead_loop_safe()) { | |
845 uint icnt = in->req(); | |
846 for (uint j = 1; j < icnt && no_dead_loop; j++) { | |
847 if (in->in(j) == n || in->in(j) == in) | |
848 no_dead_loop = false; | |
849 } | |
850 } | |
851 } | |
852 if (!no_dead_loop) n->dump(3); | |
853 assert(no_dead_loop, "dead loop detected"); | |
854 } | |
855 } | |
856 #endif | |
857 | |
858 //============================================================================= | |
859 //------------------------------PhaseIterGVN----------------------------------- | |
860 // Initialize hash table to fresh and clean for +VerifyOpto | |
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861 PhaseIterGVN::PhaseIterGVN( PhaseIterGVN *igvn, const char *dummy ) : PhaseGVN(igvn,dummy), _worklist( ), |
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862 _stack(C->live_nodes() >> 1), |
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863 _delay_transform(false) { |
0 | 864 } |
865 | |
866 //------------------------------PhaseIterGVN----------------------------------- | |
867 // Initialize with previous PhaseIterGVN info; used by PhaseCCP | |
868 PhaseIterGVN::PhaseIterGVN( PhaseIterGVN *igvn ) : PhaseGVN(igvn), | |
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869 _worklist( igvn->_worklist ), |
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870 _stack( igvn->_stack ), |
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871 _delay_transform(igvn->_delay_transform) |
0 | 872 { |
873 } | |
874 | |
875 //------------------------------PhaseIterGVN----------------------------------- | |
876 // Initialize with previous PhaseGVN info from Parser | |
877 PhaseIterGVN::PhaseIterGVN( PhaseGVN *gvn ) : PhaseGVN(gvn), | |
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878 _worklist(*C->for_igvn()), |
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879 // TODO: Before incremental inlining it was allocated only once and it was fine. Now that |
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880 // the constructor is used in incremental inlining, this consumes too much memory: |
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881 // _stack(C->live_nodes() >> 1), |
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882 // So, as a band-aid, we replace this by: |
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883 _stack(C->comp_arena(), 32), |
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884 _delay_transform(false) |
0 | 885 { |
886 uint max; | |
887 | |
888 // Dead nodes in the hash table inherited from GVN were not treated as | |
889 // roots during def-use info creation; hence they represent an invisible | |
890 // use. Clear them out. | |
891 max = _table.size(); | |
892 for( uint i = 0; i < max; ++i ) { | |
893 Node *n = _table.at(i); | |
894 if(n != NULL && n != _table.sentinel() && n->outcnt() == 0) { | |
895 if( n->is_top() ) continue; | |
896 assert( false, "Parse::remove_useless_nodes missed this node"); | |
897 hash_delete(n); | |
898 } | |
899 } | |
900 | |
901 // Any Phis or Regions on the worklist probably had uses that could not | |
902 // make more progress because the uses were made while the Phis and Regions | |
903 // were in half-built states. Put all uses of Phis and Regions on worklist. | |
904 max = _worklist.size(); | |
905 for( uint j = 0; j < max; j++ ) { | |
906 Node *n = _worklist.at(j); | |
907 uint uop = n->Opcode(); | |
908 if( uop == Op_Phi || uop == Op_Region || | |
909 n->is_Type() || | |
910 n->is_Mem() ) | |
911 add_users_to_worklist(n); | |
912 } | |
913 } | |
914 | |
915 | |
916 #ifndef PRODUCT | |
917 void PhaseIterGVN::verify_step(Node* n) { | |
918 _verify_window[_verify_counter % _verify_window_size] = n; | |
919 ++_verify_counter; | |
920 ResourceMark rm; | |
921 ResourceArea *area = Thread::current()->resource_area(); | |
922 VectorSet old_space(area), new_space(area); | |
923 if (C->unique() < 1000 || | |
924 0 == _verify_counter % (C->unique() < 10000 ? 10 : 100)) { | |
925 ++_verify_full_passes; | |
926 Node::verify_recur(C->root(), -1, old_space, new_space); | |
927 } | |
928 const int verify_depth = 4; | |
929 for ( int i = 0; i < _verify_window_size; i++ ) { | |
930 Node* n = _verify_window[i]; | |
931 if ( n == NULL ) continue; | |
932 if( n->in(0) == NodeSentinel ) { // xform_idom | |
933 _verify_window[i] = n->in(1); | |
934 --i; continue; | |
935 } | |
936 // Typical fanout is 1-2, so this call visits about 6 nodes. | |
937 Node::verify_recur(n, verify_depth, old_space, new_space); | |
938 } | |
939 } | |
940 #endif | |
941 | |
942 | |
943 //------------------------------init_worklist---------------------------------- | |
944 // Initialize worklist for each node. | |
945 void PhaseIterGVN::init_worklist( Node *n ) { | |
946 if( _worklist.member(n) ) return; | |
947 _worklist.push(n); | |
948 uint cnt = n->req(); | |
949 for( uint i =0 ; i < cnt; i++ ) { | |
950 Node *m = n->in(i); | |
951 if( m ) init_worklist(m); | |
952 } | |
953 } | |
954 | |
955 //------------------------------optimize--------------------------------------- | |
956 void PhaseIterGVN::optimize() { | |
957 debug_only(uint num_processed = 0;); | |
958 #ifndef PRODUCT | |
959 { | |
960 _verify_counter = 0; | |
961 _verify_full_passes = 0; | |
962 for ( int i = 0; i < _verify_window_size; i++ ) { | |
963 _verify_window[i] = NULL; | |
964 } | |
965 } | |
966 #endif | |
967 | |
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968 #ifdef ASSERT |
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969 Node* prev = NULL; |
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970 uint rep_cnt = 0; |
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971 #endif |
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972 uint loop_count = 0; |
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973 |
0 | 974 // Pull from worklist; transform node; |
975 // If node has changed: update edge info and put uses on worklist. | |
976 while( _worklist.size() ) { | |
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977 if (C->check_node_count(NodeLimitFudgeFactor * 2, |
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978 "out of nodes optimizing method")) { |
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979 return; |
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980 } |
0 | 981 Node *n = _worklist.pop(); |
10278 | 982 if (++loop_count >= K * C->live_nodes()) { |
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983 debug_only(n->dump(4);) |
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984 assert(false, "infinite loop in PhaseIterGVN::optimize"); |
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985 C->record_method_not_compilable("infinite loop in PhaseIterGVN::optimize"); |
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986 return; |
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987 } |
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988 #ifdef ASSERT |
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989 if (n == prev) { |
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990 if (++rep_cnt > 3) { |
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991 n->dump(4); |
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992 assert(false, "loop in Ideal transformation"); |
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993 } |
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994 } else { |
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995 rep_cnt = 0; |
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996 } |
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997 prev = n; |
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998 #endif |
0 | 999 if (TraceIterativeGVN && Verbose) { |
1000 tty->print(" Pop "); | |
1001 NOT_PRODUCT( n->dump(); ) | |
1002 debug_only(if( (num_processed++ % 100) == 0 ) _worklist.print_set();) | |
1003 } | |
1004 | |
1005 if (n->outcnt() != 0) { | |
1006 | |
1007 #ifndef PRODUCT | |
1008 uint wlsize = _worklist.size(); | |
1009 const Type* oldtype = type_or_null(n); | |
1010 #endif //PRODUCT | |
1011 | |
1012 Node *nn = transform_old(n); | |
1013 | |
1014 #ifndef PRODUCT | |
1015 if (TraceIterativeGVN) { | |
1016 const Type* newtype = type_or_null(n); | |
1017 if (nn != n) { | |
1018 // print old node | |
1019 tty->print("< "); | |
1020 if (oldtype != newtype && oldtype != NULL) { | |
1021 oldtype->dump(); | |
1022 } | |
1023 do { tty->print("\t"); } while (tty->position() < 16); | |
1024 tty->print("<"); | |
1025 n->dump(); | |
1026 } | |
1027 if (oldtype != newtype || nn != n) { | |
1028 // print new node and/or new type | |
1029 if (oldtype == NULL) { | |
1030 tty->print("* "); | |
1031 } else if (nn != n) { | |
1032 tty->print("> "); | |
1033 } else { | |
1034 tty->print("= "); | |
1035 } | |
1036 if (newtype == NULL) { | |
1037 tty->print("null"); | |
1038 } else { | |
1039 newtype->dump(); | |
1040 } | |
1041 do { tty->print("\t"); } while (tty->position() < 16); | |
1042 nn->dump(); | |
1043 } | |
1044 if (Verbose && wlsize < _worklist.size()) { | |
1045 tty->print(" Push {"); | |
1046 while (wlsize != _worklist.size()) { | |
1047 Node* pushed = _worklist.at(wlsize++); | |
1048 tty->print(" %d", pushed->_idx); | |
1049 } | |
1050 tty->print_cr(" }"); | |
1051 } | |
1052 } | |
1053 if( VerifyIterativeGVN && nn != n ) { | |
1054 verify_step((Node*) NULL); // ignore n, it might be subsumed | |
1055 } | |
1056 #endif | |
1057 } else if (!n->is_top()) { | |
1058 remove_dead_node(n); | |
1059 } | |
1060 } | |
1061 | |
1062 #ifndef PRODUCT | |
1063 C->verify_graph_edges(); | |
1064 if( VerifyOpto && allow_progress() ) { | |
1065 // Must turn off allow_progress to enable assert and break recursion | |
1066 C->root()->verify(); | |
1067 { // Check if any progress was missed using IterGVN | |
1068 // Def-Use info enables transformations not attempted in wash-pass | |
1069 // e.g. Region/Phi cleanup, ... | |
1070 // Null-check elision -- may not have reached fixpoint | |
1071 // do not propagate to dominated nodes | |
1072 ResourceMark rm; | |
1073 PhaseIterGVN igvn2(this,"Verify"); // Fresh and clean! | |
1074 // Fill worklist completely | |
1075 igvn2.init_worklist(C->root()); | |
1076 | |
1077 igvn2.set_allow_progress(false); | |
1078 igvn2.optimize(); | |
1079 igvn2.set_allow_progress(true); | |
1080 } | |
1081 } | |
1082 if ( VerifyIterativeGVN && PrintOpto ) { | |
1083 if ( _verify_counter == _verify_full_passes ) | |
1084 tty->print_cr("VerifyIterativeGVN: %d transforms and verify passes", | |
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1085 (int) _verify_full_passes); |
0 | 1086 else |
1087 tty->print_cr("VerifyIterativeGVN: %d transforms, %d full verify passes", | |
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1088 (int) _verify_counter, (int) _verify_full_passes); |
0 | 1089 } |
1090 #endif | |
1091 } | |
1092 | |
1093 | |
1094 //------------------register_new_node_with_optimizer--------------------------- | |
1095 // Register a new node with the optimizer. Update the types array, the def-use | |
1096 // info. Put on worklist. | |
1097 Node* PhaseIterGVN::register_new_node_with_optimizer(Node* n, Node* orig) { | |
1098 set_type_bottom(n); | |
1099 _worklist.push(n); | |
1100 if (orig != NULL) C->copy_node_notes_to(n, orig); | |
1101 return n; | |
1102 } | |
1103 | |
1104 //------------------------------transform-------------------------------------- | |
1105 // Non-recursive: idealize Node 'n' with respect to its inputs and its value | |
1106 Node *PhaseIterGVN::transform( Node *n ) { | |
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1107 if (_delay_transform) { |
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1108 // Register the node but don't optimize for now |
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1109 register_new_node_with_optimizer(n); |
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1110 return n; |
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1111 } |
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1112 |
0 | 1113 // If brand new node, make space in type array, and give it a type. |
1114 ensure_type_or_null(n); | |
1115 if (type_or_null(n) == NULL) { | |
1116 set_type_bottom(n); | |
1117 } | |
1118 | |
1119 return transform_old(n); | |
1120 } | |
1121 | |
1122 //------------------------------transform_old---------------------------------- | |
1123 Node *PhaseIterGVN::transform_old( Node *n ) { | |
1124 #ifndef PRODUCT | |
1125 debug_only(uint loop_count = 0;); | |
1126 set_transforms(); | |
1127 #endif | |
1128 // Remove 'n' from hash table in case it gets modified | |
1129 _table.hash_delete(n); | |
1130 if( VerifyIterativeGVN ) { | |
1131 assert( !_table.find_index(n->_idx), "found duplicate entry in table"); | |
1132 } | |
1133 | |
1134 // Apply the Ideal call in a loop until it no longer applies | |
1135 Node *k = n; | |
1136 DEBUG_ONLY(dead_loop_check(k);) | |
305 | 1137 DEBUG_ONLY(bool is_new = (k->outcnt() == 0);) |
0 | 1138 Node *i = k->Ideal(this, /*can_reshape=*/true); |
305 | 1139 assert(i != k || is_new || i->outcnt() > 0, "don't return dead nodes"); |
0 | 1140 #ifndef PRODUCT |
1141 if( VerifyIterativeGVN ) | |
1142 verify_step(k); | |
1143 if( i && VerifyOpto ) { | |
1144 if( !allow_progress() ) { | |
1145 if (i->is_Add() && i->outcnt() == 1) { | |
1146 // Switched input to left side because this is the only use | |
1147 } else if( i->is_If() && (i->in(0) == NULL) ) { | |
1148 // This IF is dead because it is dominated by an equivalent IF When | |
1149 // dominating if changed, info is not propagated sparsely to 'this' | |
1150 // Propagating this info further will spuriously identify other | |
1151 // progress. | |
1152 return i; | |
1153 } else | |
1154 set_progress(); | |
1155 } else | |
1156 set_progress(); | |
1157 } | |
1158 #endif | |
1159 | |
1160 while( i ) { | |
1161 #ifndef PRODUCT | |
1162 debug_only( if( loop_count >= K ) i->dump(4); ) | |
1163 assert(loop_count < K, "infinite loop in PhaseIterGVN::transform"); | |
1164 debug_only( loop_count++; ) | |
1165 #endif | |
1166 assert((i->_idx >= k->_idx) || i->is_top(), "Idealize should return new nodes, use Identity to return old nodes"); | |
1167 // Made a change; put users of original Node on worklist | |
1168 add_users_to_worklist( k ); | |
1169 // Replacing root of transform tree? | |
1170 if( k != i ) { | |
1171 // Make users of old Node now use new. | |
1172 subsume_node( k, i ); | |
1173 k = i; | |
1174 } | |
1175 DEBUG_ONLY(dead_loop_check(k);) | |
1176 // Try idealizing again | |
305 | 1177 DEBUG_ONLY(is_new = (k->outcnt() == 0);) |
0 | 1178 i = k->Ideal(this, /*can_reshape=*/true); |
305 | 1179 assert(i != k || is_new || i->outcnt() > 0, "don't return dead nodes"); |
0 | 1180 #ifndef PRODUCT |
1181 if( VerifyIterativeGVN ) | |
1182 verify_step(k); | |
1183 if( i && VerifyOpto ) set_progress(); | |
1184 #endif | |
1185 } | |
1186 | |
1187 // If brand new node, make space in type array. | |
1188 ensure_type_or_null(k); | |
1189 | |
1190 // See what kind of values 'k' takes on at runtime | |
1191 const Type *t = k->Value(this); | |
1192 assert(t != NULL, "value sanity"); | |
1193 | |
1194 // Since I just called 'Value' to compute the set of run-time values | |
1195 // for this Node, and 'Value' is non-local (and therefore expensive) I'll | |
1196 // cache Value. Later requests for the local phase->type of this Node can | |
1197 // use the cached Value instead of suffering with 'bottom_type'. | |
1198 if (t != type_or_null(k)) { | |
1199 NOT_PRODUCT( set_progress(); ) | |
1200 NOT_PRODUCT( inc_new_values();) | |
1201 set_type(k, t); | |
1202 // If k is a TypeNode, capture any more-precise type permanently into Node | |
1203 k->raise_bottom_type(t); | |
1204 // Move users of node to worklist | |
1205 add_users_to_worklist( k ); | |
1206 } | |
1207 | |
1208 // If 'k' computes a constant, replace it with a constant | |
1209 if( t->singleton() && !k->is_Con() ) { | |
1210 NOT_PRODUCT( set_progress(); ) | |
1211 Node *con = makecon(t); // Make a constant | |
1212 add_users_to_worklist( k ); | |
1213 subsume_node( k, con ); // Everybody using k now uses con | |
1214 return con; | |
1215 } | |
1216 | |
1217 // Now check for Identities | |
1218 i = k->Identity(this); // Look for a nearby replacement | |
1219 if( i != k ) { // Found? Return replacement! | |
1220 NOT_PRODUCT( set_progress(); ) | |
1221 add_users_to_worklist( k ); | |
1222 subsume_node( k, i ); // Everybody using k now uses i | |
1223 return i; | |
1224 } | |
1225 | |
1226 // Global Value Numbering | |
1227 i = hash_find_insert(k); // Check for pre-existing node | |
1228 if( i && (i != k) ) { | |
1229 // Return the pre-existing node if it isn't dead | |
1230 NOT_PRODUCT( set_progress(); ) | |
1231 add_users_to_worklist( k ); | |
1232 subsume_node( k, i ); // Everybody using k now uses i | |
1233 return i; | |
1234 } | |
1235 | |
1236 // Return Idealized original | |
1237 return k; | |
1238 } | |
1239 | |
1240 //---------------------------------saturate------------------------------------ | |
1241 const Type* PhaseIterGVN::saturate(const Type* new_type, const Type* old_type, | |
1242 const Type* limit_type) const { | |
1243 return new_type->narrow(old_type); | |
1244 } | |
1245 | |
1246 //------------------------------remove_globally_dead_node---------------------- | |
1247 // Kill a globally dead Node. All uses are also globally dead and are | |
1248 // aggressively trimmed. | |
1249 void PhaseIterGVN::remove_globally_dead_node( Node *dead ) { | |
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1250 enum DeleteProgress { |
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1251 PROCESS_INPUTS, |
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1252 PROCESS_OUTPUTS |
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1253 }; |
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1254 assert(_stack.is_empty(), "not empty"); |
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1255 _stack.push(dead, PROCESS_INPUTS); |
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1256 |
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1257 while (_stack.is_nonempty()) { |
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1258 dead = _stack.node(); |
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1259 uint progress_state = _stack.index(); |
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1260 assert(dead != C->root(), "killing root, eh?"); |
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1261 assert(!dead->is_top(), "add check for top when pushing"); |
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1262 NOT_PRODUCT( set_progress(); ) |
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1263 if (progress_state == PROCESS_INPUTS) { |
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1264 // After following inputs, continue to outputs |
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1265 _stack.set_index(PROCESS_OUTPUTS); |
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1266 if (!dead->is_Con()) { // Don't kill cons but uses |
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1267 bool recurse = false; |
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1268 // Remove from hash table |
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1269 _table.hash_delete( dead ); |
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1270 // Smash all inputs to 'dead', isolating him completely |
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1271 for (uint i = 0; i < dead->req(); i++) { |
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1272 Node *in = dead->in(i); |
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1273 if (in != NULL && in != C->top()) { // Points to something? |
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1274 int nrep = dead->replace_edge(in, NULL); // Kill edges |
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1275 assert((nrep > 0), "sanity"); |
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1276 if (in->outcnt() == 0) { // Made input go dead? |
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1277 _stack.push(in, PROCESS_INPUTS); // Recursively remove |
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1278 recurse = true; |
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1279 } else if (in->outcnt() == 1 && |
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1280 in->has_special_unique_user()) { |
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1281 _worklist.push(in->unique_out()); |
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1282 } else if (in->outcnt() <= 2 && dead->is_Phi()) { |
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1283 if (in->Opcode() == Op_Region) { |
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1284 _worklist.push(in); |
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1285 } else if (in->is_Store()) { |
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1286 DUIterator_Fast imax, i = in->fast_outs(imax); |
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1287 _worklist.push(in->fast_out(i)); |
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1288 i++; |
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1289 if (in->outcnt() == 2) { |
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1290 _worklist.push(in->fast_out(i)); |
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1291 i++; |
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1292 } |
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1293 assert(!(i < imax), "sanity"); |
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1294 } |
0 | 1295 } |
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1296 if (ReduceFieldZeroing && dead->is_Load() && i == MemNode::Memory && |
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1297 in->is_Proj() && in->in(0) != NULL && in->in(0)->is_Initialize()) { |
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1298 // A Load that directly follows an InitializeNode is |
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1299 // going away. The Stores that follow are candidates |
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1300 // again to be captured by the InitializeNode. |
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1301 for (DUIterator_Fast jmax, j = in->fast_outs(jmax); j < jmax; j++) { |
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1302 Node *n = in->fast_out(j); |
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1303 if (n->is_Store()) { |
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1304 _worklist.push(n); |
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1305 } |
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1306 } |
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1307 } |
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1308 } // if (in != NULL && in != C->top()) |
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1309 } // for (uint i = 0; i < dead->req(); i++) |
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1310 if (recurse) { |
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1311 continue; |
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1312 } |
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1313 } // if (!dead->is_Con()) |
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1314 } // if (progress_state == PROCESS_INPUTS) |
0 | 1315 |
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1316 // Aggressively kill globally dead uses |
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1317 // (Rather than pushing all the outs at once, we push one at a time, |
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1318 // plus the parent to resume later, because of the indefinite number |
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1319 // of edge deletions per loop trip.) |
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1320 if (dead->outcnt() > 0) { |
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1321 // Recursively remove output edges |
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1322 _stack.push(dead->raw_out(0), PROCESS_INPUTS); |
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1323 } else { |
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1324 // Finished disconnecting all input and output edges. |
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1325 _stack.pop(); |
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1326 // Remove dead node from iterative worklist |
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1327 _worklist.remove(dead); |
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1328 // Constant node that has no out-edges and has only one in-edge from |
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1329 // root is usually dead. However, sometimes reshaping walk makes |
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1330 // it reachable by adding use edges. So, we will NOT count Con nodes |
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1331 // as dead to be conservative about the dead node count at any |
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1332 // given time. |
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1333 if (!dead->is_Con()) { |
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1334 C->record_dead_node(dead->_idx); |
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1335 } |
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1336 if (dead->is_macro()) { |
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1337 C->remove_macro_node(dead); |
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1338 } |
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1339 if (dead->is_expensive()) { |
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1340 C->remove_expensive_node(dead); |
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1341 } |
0 | 1342 } |
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1343 } // while (_stack.is_nonempty()) |
0 | 1344 } |
1345 | |
1346 //------------------------------subsume_node----------------------------------- | |
1347 // Remove users from node 'old' and add them to node 'nn'. | |
1348 void PhaseIterGVN::subsume_node( Node *old, Node *nn ) { | |
1349 assert( old != hash_find(old), "should already been removed" ); | |
1350 assert( old != C->top(), "cannot subsume top node"); | |
1351 // Copy debug or profile information to the new version: | |
1352 C->copy_node_notes_to(nn, old); | |
1353 // Move users of node 'old' to node 'nn' | |
1354 for (DUIterator_Last imin, i = old->last_outs(imin); i >= imin; ) { | |
1355 Node* use = old->last_out(i); // for each use... | |
1356 // use might need re-hashing (but it won't if it's a new node) | |
1357 bool is_in_table = _table.hash_delete( use ); | |
1358 // Update use-def info as well | |
1359 // We remove all occurrences of old within use->in, | |
1360 // so as to avoid rehashing any node more than once. | |
1361 // The hash table probe swamps any outer loop overhead. | |
1362 uint num_edges = 0; | |
1363 for (uint jmax = use->len(), j = 0; j < jmax; j++) { | |
1364 if (use->in(j) == old) { | |
1365 use->set_req(j, nn); | |
1366 ++num_edges; | |
1367 } | |
1368 } | |
1369 // Insert into GVN hash table if unique | |
1370 // If a duplicate, 'use' will be cleaned up when pulled off worklist | |
1371 if( is_in_table ) { | |
1372 hash_find_insert(use); | |
1373 } | |
1374 i -= num_edges; // we deleted 1 or more copies of this edge | |
1375 } | |
1376 | |
1377 // Smash all inputs to 'old', isolating him completely | |
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1378 Node *temp = new (C) Node(1); |
0 | 1379 temp->init_req(0,nn); // Add a use to nn to prevent him from dying |
1380 remove_dead_node( old ); | |
1381 temp->del_req(0); // Yank bogus edge | |
1382 #ifndef PRODUCT | |
1383 if( VerifyIterativeGVN ) { | |
1384 for ( int i = 0; i < _verify_window_size; i++ ) { | |
1385 if ( _verify_window[i] == old ) | |
1386 _verify_window[i] = nn; | |
1387 } | |
1388 } | |
1389 #endif | |
1390 _worklist.remove(temp); // this can be necessary | |
1391 temp->destruct(); // reuse the _idx of this little guy | |
1392 } | |
1393 | |
1394 //------------------------------add_users_to_worklist-------------------------- | |
1395 void PhaseIterGVN::add_users_to_worklist0( Node *n ) { | |
1396 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1397 _worklist.push(n->fast_out(i)); // Push on worklist | |
1398 } | |
1399 } | |
1400 | |
1401 void PhaseIterGVN::add_users_to_worklist( Node *n ) { | |
1402 add_users_to_worklist0(n); | |
1403 | |
1404 // Move users of node to worklist | |
1405 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1406 Node* use = n->fast_out(i); // Get use | |
1407 | |
1408 if( use->is_Multi() || // Multi-definer? Push projs on worklist | |
1409 use->is_Store() ) // Enable store/load same address | |
1410 add_users_to_worklist0(use); | |
1411 | |
1412 // If we changed the receiver type to a call, we need to revisit | |
1413 // the Catch following the call. It's looking for a non-NULL | |
1414 // receiver to know when to enable the regular fall-through path | |
1415 // in addition to the NullPtrException path. | |
1416 if (use->is_CallDynamicJava() && n == use->in(TypeFunc::Parms)) { | |
1417 Node* p = use->as_CallDynamicJava()->proj_out(TypeFunc::Control); | |
1418 if (p != NULL) { | |
1419 add_users_to_worklist0(p); | |
1420 } | |
1421 } | |
1422 | |
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1423 uint use_op = use->Opcode(); |
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1424 if(use->is_Cmp()) { // Enable CMP/BOOL optimization |
0 | 1425 add_users_to_worklist(use); // Put Bool on worklist |
1426 if (use->outcnt() > 0) { | |
1427 Node* bol = use->raw_out(0); | |
1428 if (bol->outcnt() > 0) { | |
1429 Node* iff = bol->raw_out(0); | |
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1430 if (use_op == Op_CmpI && |
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1431 iff->is_CountedLoopEnd()) { |
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1432 CountedLoopEndNode* cle = iff->as_CountedLoopEnd(); |
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1433 if (cle->limit() == n && cle->phi() != NULL) { |
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1434 // If an opaque node feeds into the limit condition of a |
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1435 // CountedLoop, we need to process the Phi node for the |
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1436 // induction variable when the opaque node is removed: |
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1437 // the range of values taken by the Phi is now known and |
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1438 // so its type is also known. |
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1439 _worklist.push(cle->phi()); |
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1440 } |
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1441 } else if (iff->outcnt() == 2) { |
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1442 // Look for the 'is_x2logic' pattern: "x ? : 0 : 1" and put the |
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1443 // phi merging either 0 or 1 onto the worklist |
0 | 1444 Node* ifproj0 = iff->raw_out(0); |
1445 Node* ifproj1 = iff->raw_out(1); | |
1446 if (ifproj0->outcnt() > 0 && ifproj1->outcnt() > 0) { | |
1447 Node* region0 = ifproj0->raw_out(0); | |
1448 Node* region1 = ifproj1->raw_out(0); | |
1449 if( region0 == region1 ) | |
1450 add_users_to_worklist0(region0); | |
1451 } | |
1452 } | |
1453 } | |
1454 } | |
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1455 if (use_op == Op_CmpI) { |
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1456 Node* in1 = use->in(1); |
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1457 for (uint i = 0; i < in1->outcnt(); i++) { |
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1458 if (in1->raw_out(i)->Opcode() == Op_CastII) { |
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1459 Node* castii = in1->raw_out(i); |
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1460 if (castii->in(0) != NULL && castii->in(0)->in(0) != NULL && castii->in(0)->in(0)->is_If()) { |
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1461 Node* ifnode = castii->in(0)->in(0); |
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1462 if (ifnode->in(1) != NULL && ifnode->in(1)->is_Bool() && ifnode->in(1)->in(1) == use) { |
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1463 // Reprocess a CastII node that may depend on an |
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1464 // opaque node value when the opaque node is |
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1465 // removed. In case it carries a dependency we can do |
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1466 // a better job of computing its type. |
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1467 _worklist.push(castii); |
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1468 } |
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1469 } |
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1470 } |
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1471 } |
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1472 } |
0 | 1473 } |
1474 | |
1475 // If changed Cast input, check Phi users for simple cycles | |
65 | 1476 if( use->is_ConstraintCast() || use->is_CheckCastPP() ) { |
0 | 1477 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { |
1478 Node* u = use->fast_out(i2); | |
1479 if (u->is_Phi()) | |
1480 _worklist.push(u); | |
1481 } | |
1482 } | |
1483 // If changed LShift inputs, check RShift users for useless sign-ext | |
1484 if( use_op == Op_LShiftI ) { | |
1485 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { | |
1486 Node* u = use->fast_out(i2); | |
1487 if (u->Opcode() == Op_RShiftI) | |
1488 _worklist.push(u); | |
1489 } | |
1490 } | |
17936 | 1491 // If changed AddI/SubI inputs, check CmpU for range check optimization. |
1492 if (use_op == Op_AddI || use_op == Op_SubI) { | |
1493 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { | |
1494 Node* u = use->fast_out(i2); | |
1495 if (u->is_Cmp() && (u->Opcode() == Op_CmpU)) { | |
1496 _worklist.push(u); | |
1497 } | |
1498 } | |
1499 } | |
0 | 1500 // If changed AddP inputs, check Stores for loop invariant |
1501 if( use_op == Op_AddP ) { | |
1502 for (DUIterator_Fast i2max, i2 = use->fast_outs(i2max); i2 < i2max; i2++) { | |
1503 Node* u = use->fast_out(i2); | |
1504 if (u->is_Mem()) | |
1505 _worklist.push(u); | |
1506 } | |
1507 } | |
1508 // If changed initialization activity, check dependent Stores | |
1509 if (use_op == Op_Allocate || use_op == Op_AllocateArray) { | |
1510 InitializeNode* init = use->as_Allocate()->initialization(); | |
1511 if (init != NULL) { | |
1512 Node* imem = init->proj_out(TypeFunc::Memory); | |
1513 if (imem != NULL) add_users_to_worklist0(imem); | |
1514 } | |
1515 } | |
1516 if (use_op == Op_Initialize) { | |
1517 Node* imem = use->as_Initialize()->proj_out(TypeFunc::Memory); | |
1518 if (imem != NULL) add_users_to_worklist0(imem); | |
1519 } | |
1520 } | |
1521 } | |
1522 | |
12966 | 1523 /** |
1524 * Remove the speculative part of all types that we know of | |
1525 */ | |
1526 void PhaseIterGVN::remove_speculative_types() { | |
1527 assert(UseTypeSpeculation, "speculation is off"); | |
1528 for (uint i = 0; i < _types.Size(); i++) { | |
1529 const Type* t = _types.fast_lookup(i); | |
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1530 if (t != NULL) { |
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1531 _types.map(i, t->remove_speculative()); |
12966 | 1532 } |
1533 } | |
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1534 _table.check_no_speculative_types(); |
12966 | 1535 } |
1536 | |
0 | 1537 //============================================================================= |
1538 #ifndef PRODUCT | |
1539 uint PhaseCCP::_total_invokes = 0; | |
1540 uint PhaseCCP::_total_constants = 0; | |
1541 #endif | |
1542 //------------------------------PhaseCCP--------------------------------------- | |
1543 // Conditional Constant Propagation, ala Wegman & Zadeck | |
1544 PhaseCCP::PhaseCCP( PhaseIterGVN *igvn ) : PhaseIterGVN(igvn) { | |
1545 NOT_PRODUCT( clear_constants(); ) | |
1546 assert( _worklist.size() == 0, "" ); | |
1547 // Clear out _nodes from IterGVN. Must be clear to transform call. | |
1548 _nodes.clear(); // Clear out from IterGVN | |
1549 analyze(); | |
1550 } | |
1551 | |
1552 #ifndef PRODUCT | |
1553 //------------------------------~PhaseCCP-------------------------------------- | |
1554 PhaseCCP::~PhaseCCP() { | |
1555 inc_invokes(); | |
1556 _total_constants += count_constants(); | |
1557 } | |
1558 #endif | |
1559 | |
1560 | |
1561 #ifdef ASSERT | |
1562 static bool ccp_type_widens(const Type* t, const Type* t0) { | |
1563 assert(t->meet(t0) == t, "Not monotonic"); | |
1564 switch (t->base() == t0->base() ? t->base() : Type::Top) { | |
1565 case Type::Int: | |
1566 assert(t0->isa_int()->_widen <= t->isa_int()->_widen, "widen increases"); | |
1567 break; | |
1568 case Type::Long: | |
1569 assert(t0->isa_long()->_widen <= t->isa_long()->_widen, "widen increases"); | |
1570 break; | |
1571 } | |
1572 return true; | |
1573 } | |
1574 #endif //ASSERT | |
1575 | |
1576 //------------------------------analyze---------------------------------------- | |
1577 void PhaseCCP::analyze() { | |
1578 // Initialize all types to TOP, optimistic analysis | |
1579 for (int i = C->unique() - 1; i >= 0; i--) { | |
1580 _types.map(i,Type::TOP); | |
1581 } | |
1582 | |
1583 // Push root onto worklist | |
1584 Unique_Node_List worklist; | |
1585 worklist.push(C->root()); | |
1586 | |
1587 // Pull from worklist; compute new value; push changes out. | |
1588 // This loop is the meat of CCP. | |
1589 while( worklist.size() ) { | |
1590 Node *n = worklist.pop(); | |
1591 const Type *t = n->Value(this); | |
1592 if (t != type(n)) { | |
1593 assert(ccp_type_widens(t, type(n)), "ccp type must widen"); | |
1594 #ifndef PRODUCT | |
1595 if( TracePhaseCCP ) { | |
1596 t->dump(); | |
1597 do { tty->print("\t"); } while (tty->position() < 16); | |
1598 n->dump(); | |
1599 } | |
1600 #endif | |
1601 set_type(n, t); | |
1602 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1603 Node* m = n->fast_out(i); // Get user | |
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1604 if (m->is_Region()) { // New path to Region? Must recheck Phis too |
0 | 1605 for (DUIterator_Fast i2max, i2 = m->fast_outs(i2max); i2 < i2max; i2++) { |
1606 Node* p = m->fast_out(i2); // Propagate changes to uses | |
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1607 if (p->bottom_type() != type(p)) { // If not already bottomed out |
0 | 1608 worklist.push(p); // Propagate change to user |
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1609 } |
0 | 1610 } |
1611 } | |
605 | 1612 // If we changed the receiver type to a call, we need to revisit |
0 | 1613 // the Catch following the call. It's looking for a non-NULL |
1614 // receiver to know when to enable the regular fall-through path | |
1615 // in addition to the NullPtrException path | |
1616 if (m->is_Call()) { | |
1617 for (DUIterator_Fast i2max, i2 = m->fast_outs(i2max); i2 < i2max; i2++) { | |
1618 Node* p = m->fast_out(i2); // Propagate changes to uses | |
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1619 if (p->is_Proj() && p->as_Proj()->_con == TypeFunc::Control && p->outcnt() == 1) { |
0 | 1620 worklist.push(p->unique_out()); |
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1621 } |
0 | 1622 } |
1623 } | |
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1624 if (m->bottom_type() != type(m)) { // If not already bottomed out |
0 | 1625 worklist.push(m); // Propagate change to user |
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1626 } |
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1627 |
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1628 // CmpU nodes can get their type information from two nodes up in the |
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1629 // graph (instead of from the nodes immediately above). Make sure they |
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1630 // are added to the worklist if nodes they depend on are updated, since |
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1631 // they could be missed and get wrong types otherwise. |
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1632 uint m_op = m->Opcode(); |
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1633 if (m_op == Op_AddI || m_op == Op_SubI) { |
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1634 for (DUIterator_Fast i2max, i2 = m->fast_outs(i2max); i2 < i2max; i2++) { |
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1635 Node* p = m->fast_out(i2); // Propagate changes to uses |
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1636 if (p->Opcode() == Op_CmpU) { |
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1637 // Got a CmpU which might need the new type information from node n. |
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1638 if(p->bottom_type() != type(p)) { // If not already bottomed out |
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1639 worklist.push(p); // Propagate change to user |
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1640 } |
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1641 } |
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1642 } |
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1643 } |
0 | 1644 } |
1645 } | |
1646 } | |
1647 } | |
1648 | |
1649 //------------------------------do_transform----------------------------------- | |
1650 // Top level driver for the recursive transformer | |
1651 void PhaseCCP::do_transform() { | |
1652 // Correct leaves of new-space Nodes; they point to old-space. | |
1653 C->set_root( transform(C->root())->as_Root() ); | |
1654 assert( C->top(), "missing TOP node" ); | |
1655 assert( C->root(), "missing root" ); | |
1656 } | |
1657 | |
1658 //------------------------------transform-------------------------------------- | |
1659 // Given a Node in old-space, clone him into new-space. | |
1660 // Convert any of his old-space children into new-space children. | |
1661 Node *PhaseCCP::transform( Node *n ) { | |
1662 Node *new_node = _nodes[n->_idx]; // Check for transformed node | |
1663 if( new_node != NULL ) | |
1664 return new_node; // Been there, done that, return old answer | |
1665 new_node = transform_once(n); // Check for constant | |
1666 _nodes.map( n->_idx, new_node ); // Flag as having been cloned | |
1667 | |
1668 // Allocate stack of size _nodes.Size()/2 to avoid frequent realloc | |
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1669 GrowableArray <Node *> trstack(C->live_nodes() >> 1); |
0 | 1670 |
1671 trstack.push(new_node); // Process children of cloned node | |
1672 while ( trstack.is_nonempty() ) { | |
1673 Node *clone = trstack.pop(); | |
1674 uint cnt = clone->req(); | |
1675 for( uint i = 0; i < cnt; i++ ) { // For all inputs do | |
1676 Node *input = clone->in(i); | |
1677 if( input != NULL ) { // Ignore NULLs | |
1678 Node *new_input = _nodes[input->_idx]; // Check for cloned input node | |
1679 if( new_input == NULL ) { | |
1680 new_input = transform_once(input); // Check for constant | |
1681 _nodes.map( input->_idx, new_input );// Flag as having been cloned | |
1682 trstack.push(new_input); | |
1683 } | |
1684 assert( new_input == clone->in(i), "insanity check"); | |
1685 } | |
1686 } | |
1687 } | |
1688 return new_node; | |
1689 } | |
1690 | |
1691 | |
1692 //------------------------------transform_once--------------------------------- | |
1693 // For PhaseCCP, transformation is IDENTITY unless Node computed a constant. | |
1694 Node *PhaseCCP::transform_once( Node *n ) { | |
1695 const Type *t = type(n); | |
1696 // Constant? Use constant Node instead | |
1697 if( t->singleton() ) { | |
1698 Node *nn = n; // Default is to return the original constant | |
1699 if( t == Type::TOP ) { | |
1700 // cache my top node on the Compile instance | |
1701 if( C->cached_top_node() == NULL || C->cached_top_node()->in(0) == NULL ) { | |
1702 C->set_cached_top_node( ConNode::make(C, Type::TOP) ); | |
1703 set_type(C->top(), Type::TOP); | |
1704 } | |
1705 nn = C->top(); | |
1706 } | |
1707 if( !n->is_Con() ) { | |
1708 if( t != Type::TOP ) { | |
1709 nn = makecon(t); // ConNode::make(t); | |
1710 NOT_PRODUCT( inc_constants(); ) | |
1711 } else if( n->is_Region() ) { // Unreachable region | |
1712 // Note: nn == C->top() | |
1713 n->set_req(0, NULL); // Cut selfreference | |
1714 // Eagerly remove dead phis to avoid phis copies creation. | |
1715 for (DUIterator i = n->outs(); n->has_out(i); i++) { | |
1716 Node* m = n->out(i); | |
1717 if( m->is_Phi() ) { | |
1718 assert(type(m) == Type::TOP, "Unreachable region should not have live phis."); | |
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1719 replace_node(m, nn); |
0 | 1720 --i; // deleted this phi; rescan starting with next position |
1721 } | |
1722 } | |
1723 } | |
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1724 replace_node(n,nn); // Update DefUse edges for new constant |
0 | 1725 } |
1726 return nn; | |
1727 } | |
1728 | |
1729 // If x is a TypeNode, capture any more-precise type permanently into Node | |
1730 if (t != n->bottom_type()) { | |
1731 hash_delete(n); // changing bottom type may force a rehash | |
1732 n->raise_bottom_type(t); | |
1733 _worklist.push(n); // n re-enters the hash table via the worklist | |
1734 } | |
1735 | |
1736 // Idealize graph using DU info. Must clone() into new-space. | |
1737 // DU info is generally used to show profitability, progress or safety | |
1738 // (but generally not needed for correctness). | |
1739 Node *nn = n->Ideal_DU_postCCP(this); | |
1740 | |
1741 // TEMPORARY fix to ensure that 2nd GVN pass eliminates NULL checks | |
1742 switch( n->Opcode() ) { | |
1743 case Op_FastLock: // Revisit FastLocks for lock coarsening | |
1744 case Op_If: | |
1745 case Op_CountedLoopEnd: | |
1746 case Op_Region: | |
1747 case Op_Loop: | |
1748 case Op_CountedLoop: | |
1749 case Op_Conv2B: | |
1750 case Op_Opaque1: | |
1751 case Op_Opaque2: | |
1752 _worklist.push(n); | |
1753 break; | |
1754 default: | |
1755 break; | |
1756 } | |
1757 if( nn ) { | |
1758 _worklist.push(n); | |
1759 // Put users of 'n' onto worklist for second igvn transform | |
1760 add_users_to_worklist(n); | |
1761 return nn; | |
1762 } | |
1763 | |
1764 return n; | |
1765 } | |
1766 | |
1767 //---------------------------------saturate------------------------------------ | |
1768 const Type* PhaseCCP::saturate(const Type* new_type, const Type* old_type, | |
1769 const Type* limit_type) const { | |
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1770 const Type* wide_type = new_type->widen(old_type, limit_type); |
0 | 1771 if (wide_type != new_type) { // did we widen? |
1772 // If so, we may have widened beyond the limit type. Clip it back down. | |
1773 new_type = wide_type->filter(limit_type); | |
1774 } | |
1775 return new_type; | |
1776 } | |
1777 | |
1778 //------------------------------print_statistics------------------------------- | |
1779 #ifndef PRODUCT | |
1780 void PhaseCCP::print_statistics() { | |
1781 tty->print_cr("CCP: %d constants found: %d", _total_invokes, _total_constants); | |
1782 } | |
1783 #endif | |
1784 | |
1785 | |
1786 //============================================================================= | |
1787 #ifndef PRODUCT | |
1788 uint PhasePeephole::_total_peepholes = 0; | |
1789 #endif | |
1790 //------------------------------PhasePeephole---------------------------------- | |
1791 // Conditional Constant Propagation, ala Wegman & Zadeck | |
1792 PhasePeephole::PhasePeephole( PhaseRegAlloc *regalloc, PhaseCFG &cfg ) | |
1793 : PhaseTransform(Peephole), _regalloc(regalloc), _cfg(cfg) { | |
1794 NOT_PRODUCT( clear_peepholes(); ) | |
1795 } | |
1796 | |
1797 #ifndef PRODUCT | |
1798 //------------------------------~PhasePeephole--------------------------------- | |
1799 PhasePeephole::~PhasePeephole() { | |
1800 _total_peepholes += count_peepholes(); | |
1801 } | |
1802 #endif | |
1803 | |
1804 //------------------------------transform-------------------------------------- | |
1805 Node *PhasePeephole::transform( Node *n ) { | |
1806 ShouldNotCallThis(); | |
1807 return NULL; | |
1808 } | |
1809 | |
1810 //------------------------------do_transform----------------------------------- | |
1811 void PhasePeephole::do_transform() { | |
1812 bool method_name_not_printed = true; | |
1813 | |
1814 // Examine each basic block | |
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1815 for (uint block_number = 1; block_number < _cfg.number_of_blocks(); ++block_number) { |
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1816 Block* block = _cfg.get_block(block_number); |
0 | 1817 bool block_not_printed = true; |
1818 | |
1819 // and each instruction within a block | |
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1820 uint end_index = block->number_of_nodes(); |
0 | 1821 // block->end_idx() not valid after PhaseRegAlloc |
1822 for( uint instruction_index = 1; instruction_index < end_index; ++instruction_index ) { | |
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1823 Node *n = block->get_node(instruction_index); |
0 | 1824 if( n->is_Mach() ) { |
1825 MachNode *m = n->as_Mach(); | |
1826 int deleted_count = 0; | |
1827 // check for peephole opportunities | |
1828 MachNode *m2 = m->peephole( block, instruction_index, _regalloc, deleted_count, C ); | |
1829 if( m2 != NULL ) { | |
1830 #ifndef PRODUCT | |
1831 if( PrintOptoPeephole ) { | |
1832 // Print method, first time only | |
1833 if( C->method() && method_name_not_printed ) { | |
1834 C->method()->print_short_name(); tty->cr(); | |
1835 method_name_not_printed = false; | |
1836 } | |
1837 // Print this block | |
1838 if( Verbose && block_not_printed) { | |
1839 tty->print_cr("in block"); | |
1840 block->dump(); | |
1841 block_not_printed = false; | |
1842 } | |
1843 // Print instructions being deleted | |
1844 for( int i = (deleted_count - 1); i >= 0; --i ) { | |
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1845 block->get_node(instruction_index-i)->as_Mach()->format(_regalloc); tty->cr(); |
0 | 1846 } |
1847 tty->print_cr("replaced with"); | |
1848 // Print new instruction | |
1849 m2->format(_regalloc); | |
1850 tty->print("\n\n"); | |
1851 } | |
1852 #endif | |
1853 // Remove old nodes from basic block and update instruction_index | |
1854 // (old nodes still exist and may have edges pointing to them | |
1855 // as register allocation info is stored in the allocator using | |
1856 // the node index to live range mappings.) | |
1857 uint safe_instruction_index = (instruction_index - deleted_count); | |
1858 for( ; (instruction_index > safe_instruction_index); --instruction_index ) { | |
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1859 block->remove_node( instruction_index ); |
0 | 1860 } |
1861 // install new node after safe_instruction_index | |
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1862 block->insert_node(m2, safe_instruction_index + 1); |
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1863 end_index = block->number_of_nodes() - 1; // Recompute new block size |
0 | 1864 NOT_PRODUCT( inc_peepholes(); ) |
1865 } | |
1866 } | |
1867 } | |
1868 } | |
1869 } | |
1870 | |
1871 //------------------------------print_statistics------------------------------- | |
1872 #ifndef PRODUCT | |
1873 void PhasePeephole::print_statistics() { | |
1874 tty->print_cr("Peephole: peephole rules applied: %d", _total_peepholes); | |
1875 } | |
1876 #endif | |
1877 | |
1878 | |
1879 //============================================================================= | |
1880 //------------------------------set_req_X-------------------------------------- | |
1881 void Node::set_req_X( uint i, Node *n, PhaseIterGVN *igvn ) { | |
1882 assert( is_not_dead(n), "can not use dead node"); | |
1883 assert( igvn->hash_find(this) != this, "Need to remove from hash before changing edges" ); | |
1884 Node *old = in(i); | |
1885 set_req(i, n); | |
1886 | |
1887 // old goes dead? | |
1888 if( old ) { | |
1889 switch (old->outcnt()) { | |
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1890 case 0: |
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1891 // Put into the worklist to kill later. We do not kill it now because the |
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1892 // recursive kill will delete the current node (this) if dead-loop exists |
0 | 1893 if (!old->is_top()) |
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1894 igvn->_worklist.push( old ); |
0 | 1895 break; |
1896 case 1: | |
1897 if( old->is_Store() || old->has_special_unique_user() ) | |
1898 igvn->add_users_to_worklist( old ); | |
1899 break; | |
1900 case 2: | |
1901 if( old->is_Store() ) | |
1902 igvn->add_users_to_worklist( old ); | |
1903 if( old->Opcode() == Op_Region ) | |
1904 igvn->_worklist.push(old); | |
1905 break; | |
1906 case 3: | |
1907 if( old->Opcode() == Op_Region ) { | |
1908 igvn->_worklist.push(old); | |
1909 igvn->add_users_to_worklist( old ); | |
1910 } | |
1911 break; | |
1912 default: | |
1913 break; | |
1914 } | |
1915 } | |
1916 | |
1917 } | |
1918 | |
1919 //-------------------------------replace_by----------------------------------- | |
1920 // Using def-use info, replace one node for another. Follow the def-use info | |
1921 // to all users of the OLD node. Then make all uses point to the NEW node. | |
1922 void Node::replace_by(Node *new_node) { | |
1923 assert(!is_top(), "top node has no DU info"); | |
1924 for (DUIterator_Last imin, i = last_outs(imin); i >= imin; ) { | |
1925 Node* use = last_out(i); | |
1926 uint uses_found = 0; | |
1927 for (uint j = 0; j < use->len(); j++) { | |
1928 if (use->in(j) == this) { | |
1929 if (j < use->req()) | |
1930 use->set_req(j, new_node); | |
1931 else use->set_prec(j, new_node); | |
1932 uses_found++; | |
1933 } | |
1934 } | |
1935 i -= uses_found; // we deleted 1 or more copies of this edge | |
1936 } | |
1937 } | |
1938 | |
1939 //============================================================================= | |
1940 //----------------------------------------------------------------------------- | |
1941 void Type_Array::grow( uint i ) { | |
1942 if( !_max ) { | |
1943 _max = 1; | |
1944 _types = (const Type**)_a->Amalloc( _max * sizeof(Type*) ); | |
1945 _types[0] = NULL; | |
1946 } | |
1947 uint old = _max; | |
1948 while( i >= _max ) _max <<= 1; // Double to fit | |
1949 _types = (const Type**)_a->Arealloc( _types, old*sizeof(Type*),_max*sizeof(Type*)); | |
1950 memset( &_types[old], 0, (_max-old)*sizeof(Type*) ); | |
1951 } | |
1952 | |
1953 //------------------------------dump------------------------------------------- | |
1954 #ifndef PRODUCT | |
1955 void Type_Array::dump() const { | |
1956 uint max = Size(); | |
1957 for( uint i = 0; i < max; i++ ) { | |
1958 if( _types[i] != NULL ) { | |
1959 tty->print(" %d\t== ", i); _types[i]->dump(); tty->cr(); | |
1960 } | |
1961 } | |
1962 } | |
1963 #endif |