Mercurial > hg > truffle
annotate src/share/vm/opto/phaseX.hpp @ 196:d1605aabd0a1 jdk7-b30
6719955: Update copyright year
Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell
| author | xdono |
|---|---|
| date | Wed, 02 Jul 2008 12:55:16 -0700 |
| parents | ba764ed4b6f2 |
| children | fc4be448891f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 class Compile; | |
| 26 class ConINode; | |
| 27 class ConLNode; | |
| 28 class Node; | |
| 29 class Type; | |
| 30 class PhaseTransform; | |
| 31 class PhaseGVN; | |
| 32 class PhaseIterGVN; | |
| 33 class PhaseCCP; | |
| 34 class PhasePeephole; | |
| 35 class PhaseRegAlloc; | |
| 36 | |
| 37 | |
| 38 //----------------------------------------------------------------------------- | |
| 39 // Expandable closed hash-table of nodes, initialized to NULL. | |
| 40 // Note that the constructor just zeros things | |
| 41 // Storage is reclaimed when the Arena's lifetime is over. | |
| 42 class NodeHash : public StackObj { | |
| 43 protected: | |
| 44 Arena *_a; // Arena to allocate in | |
| 45 uint _max; // Size of table (power of 2) | |
| 46 uint _inserts; // For grow and debug, count of hash_inserts | |
| 47 uint _insert_limit; // 'grow' when _inserts reaches _insert_limit | |
| 48 Node **_table; // Hash table of Node pointers | |
| 49 Node *_sentinel; // Replaces deleted entries in hash table | |
| 50 | |
| 51 public: | |
| 52 NodeHash(uint est_max_size); | |
| 53 NodeHash(Arena *arena, uint est_max_size); | |
| 54 NodeHash(NodeHash *use_this_state); | |
| 55 #ifdef ASSERT | |
| 56 ~NodeHash(); // Unlock all nodes upon destruction of table. | |
| 57 void operator=(const NodeHash&); // Unlock all nodes upon replacement of table. | |
| 58 #endif | |
| 59 Node *hash_find(const Node*);// Find an equivalent version in hash table | |
| 60 Node *hash_find_insert(Node*);// If not in table insert else return found node | |
| 61 void hash_insert(Node*); // Insert into hash table | |
| 62 bool hash_delete(const Node*);// Replace with _sentinel in hash table | |
| 63 void check_grow() { | |
| 64 _inserts++; | |
| 65 if( _inserts == _insert_limit ) { grow(); } | |
| 66 assert( _inserts <= _insert_limit, "hash table overflow"); | |
| 67 assert( _inserts < _max, "hash table overflow" ); | |
| 68 } | |
| 69 static uint round_up(uint); // Round up to nearest power of 2 | |
| 70 void grow(); // Grow _table to next power of 2 and rehash | |
| 71 // Return 75% of _max, rounded up. | |
| 72 uint insert_limit() const { return _max - (_max>>2); } | |
| 73 | |
| 74 void clear(); // Set all entries to NULL, keep storage. | |
| 75 // Size of hash table | |
| 76 uint size() const { return _max; } | |
| 77 // Return Node* at index in table | |
| 78 Node *at(uint table_index) { | |
| 79 assert(table_index < _max, "Must be within table"); | |
| 80 return _table[table_index]; | |
| 81 } | |
| 82 | |
| 83 void remove_useless_nodes(VectorSet &useful); // replace with sentinel | |
| 84 | |
| 85 Node *sentinel() { return _sentinel; } | |
| 86 | |
| 87 #ifndef PRODUCT | |
| 88 Node *find_index(uint idx); // For debugging | |
| 89 void dump(); // For debugging, dump statistics | |
| 90 #endif | |
| 91 uint _grows; // For debugging, count of table grow()s | |
| 92 uint _look_probes; // For debugging, count of hash probes | |
| 93 uint _lookup_hits; // For debugging, count of hash_finds | |
| 94 uint _lookup_misses; // For debugging, count of hash_finds | |
| 95 uint _insert_probes; // For debugging, count of hash probes | |
| 96 uint _delete_probes; // For debugging, count of hash probes for deletes | |
| 97 uint _delete_hits; // For debugging, count of hash probes for deletes | |
| 98 uint _delete_misses; // For debugging, count of hash probes for deletes | |
| 99 uint _total_inserts; // For debugging, total inserts into hash table | |
| 100 uint _total_insert_probes; // For debugging, total probes while inserting | |
| 101 }; | |
| 102 | |
| 103 | |
| 104 //----------------------------------------------------------------------------- | |
| 105 // Map dense integer indices to Types. Uses classic doubling-array trick. | |
| 106 // Abstractly provides an infinite array of Type*'s, initialized to NULL. | |
| 107 // Note that the constructor just zeros things, and since I use Arena | |
| 108 // allocation I do not need a destructor to reclaim storage. | |
| 109 // Despite the general name, this class is customized for use by PhaseTransform. | |
| 110 class Type_Array : public StackObj { | |
| 111 Arena *_a; // Arena to allocate in | |
| 112 uint _max; | |
| 113 const Type **_types; | |
| 114 void grow( uint i ); // Grow array node to fit | |
| 115 const Type *operator[] ( uint i ) const // Lookup, or NULL for not mapped | |
| 116 { return (i<_max) ? _types[i] : (Type*)NULL; } | |
| 117 friend class PhaseTransform; | |
| 118 public: | |
| 119 Type_Array(Arena *a) : _a(a), _max(0), _types(0) {} | |
| 120 Type_Array(Type_Array *ta) : _a(ta->_a), _max(ta->_max), _types(ta->_types) { } | |
| 121 const Type *fast_lookup(uint i) const{assert(i<_max,"oob");return _types[i];} | |
| 122 // Extend the mapping: index i maps to Type *n. | |
| 123 void map( uint i, const Type *n ) { if( i>=_max ) grow(i); _types[i] = n; } | |
| 124 uint Size() const { return _max; } | |
| 125 #ifndef PRODUCT | |
| 126 void dump() const; | |
| 127 #endif | |
| 128 }; | |
| 129 | |
| 130 | |
| 131 //------------------------------PhaseRemoveUseless----------------------------- | |
| 132 // Remove useless nodes from GVN hash-table, worklist, and graph | |
| 133 class PhaseRemoveUseless : public Phase { | |
| 134 protected: | |
| 135 Unique_Node_List _useful; // Nodes reachable from root | |
| 136 // list is allocated from current resource area | |
| 137 public: | |
| 138 PhaseRemoveUseless( PhaseGVN *gvn, Unique_Node_List *worklist ); | |
| 139 | |
| 140 Unique_Node_List *get_useful() { return &_useful; } | |
| 141 }; | |
| 142 | |
| 143 | |
| 144 //------------------------------PhaseTransform--------------------------------- | |
| 145 // Phases that analyze, then transform. Constructing the Phase object does any | |
| 146 // global or slow analysis. The results are cached later for a fast | |
| 147 // transformation pass. When the Phase object is deleted the cached analysis | |
| 148 // results are deleted. | |
| 149 class PhaseTransform : public Phase { | |
| 150 protected: | |
| 151 Arena* _arena; | |
| 152 Node_Array _nodes; // Map old node indices to new nodes. | |
| 153 Type_Array _types; // Map old node indices to Types. | |
| 154 | |
| 155 // ConNode caches: | |
| 156 enum { _icon_min = -1 * HeapWordSize, | |
| 157 _icon_max = 16 * HeapWordSize, | |
| 158 _lcon_min = _icon_min, | |
| 159 _lcon_max = _icon_max, | |
| 160 _zcon_max = (uint)T_CONFLICT | |
| 161 }; | |
| 162 ConINode* _icons[_icon_max - _icon_min + 1]; // cached jint constant nodes | |
| 163 ConLNode* _lcons[_lcon_max - _lcon_min + 1]; // cached jlong constant nodes | |
| 164 ConNode* _zcons[_zcon_max + 1]; // cached is_zero_type nodes | |
| 165 void init_con_caches(); | |
| 166 | |
| 167 // Support both int and long caches because either might be an intptr_t, | |
| 168 // so they show up frequently in address computations. | |
| 169 | |
| 170 public: | |
| 171 PhaseTransform( PhaseNumber pnum ); | |
| 172 PhaseTransform( Arena *arena, PhaseNumber pnum ); | |
| 173 PhaseTransform( PhaseTransform *phase, PhaseNumber pnum ); | |
| 174 | |
| 175 Arena* arena() { return _arena; } | |
| 176 Type_Array& types() { return _types; } | |
| 177 // _nodes is used in varying ways by subclasses, which define local accessors | |
| 178 | |
| 179 public: | |
| 180 // Get a previously recorded type for the node n. | |
| 181 // This type must already have been recorded. | |
| 182 // If you want the type of a very new (untransformed) node, | |
| 183 // you must use type_or_null, and test the result for NULL. | |
| 184 const Type* type(const Node* n) const { | |
| 185 const Type* t = _types.fast_lookup(n->_idx); | |
| 186 assert(t != NULL, "must set before get"); | |
| 187 return t; | |
| 188 } | |
| 189 // Get a previously recorded type for the node n, | |
| 190 // or else return NULL if there is none. | |
| 191 const Type* type_or_null(const Node* n) const { | |
| 192 return _types.fast_lookup(n->_idx); | |
| 193 } | |
| 194 // Record a type for a node. | |
| 195 void set_type(const Node* n, const Type *t) { | |
| 196 assert(t != NULL, "type must not be null"); | |
| 197 _types.map(n->_idx, t); | |
| 198 } | |
| 199 // Record an initial type for a node, the node's bottom type. | |
| 200 void set_type_bottom(const Node* n) { | |
| 201 // Use this for initialization when bottom_type() (or better) is not handy. | |
| 202 // Usually the initialization shoudl be to n->Value(this) instead, | |
| 203 // or a hand-optimized value like Type::MEMORY or Type::CONTROL. | |
| 204 assert(_types[n->_idx] == NULL, "must set the initial type just once"); | |
| 205 _types.map(n->_idx, n->bottom_type()); | |
| 206 } | |
| 207 // Make sure the types array is big enough to record a size for the node n. | |
| 208 // (In product builds, we never want to do range checks on the types array!) | |
| 209 void ensure_type_or_null(const Node* n) { | |
| 210 if (n->_idx >= _types.Size()) | |
| 211 _types.map(n->_idx, NULL); // Grow the types array as needed. | |
| 212 } | |
| 213 | |
| 214 // Utility functions: | |
| 215 const TypeInt* find_int_type( Node* n); | |
| 216 const TypeLong* find_long_type(Node* n); | |
| 217 jint find_int_con( Node* n, jint value_if_unknown) { | |
| 218 const TypeInt* t = find_int_type(n); | |
| 219 return (t != NULL && t->is_con()) ? t->get_con() : value_if_unknown; | |
| 220 } | |
| 221 jlong find_long_con(Node* n, jlong value_if_unknown) { | |
| 222 const TypeLong* t = find_long_type(n); | |
| 223 return (t != NULL && t->is_con()) ? t->get_con() : value_if_unknown; | |
| 224 } | |
| 225 | |
| 226 // Make an idealized constant, i.e., one of ConINode, ConPNode, ConFNode, etc. | |
| 227 // Same as transform(ConNode::make(t)). | |
| 228 ConNode* makecon(const Type* t); | |
| 229 virtual ConNode* uncached_makecon(const Type* t) // override in PhaseValues | |
| 230 { ShouldNotCallThis(); return NULL; } | |
| 231 | |
| 232 // Fast int or long constant. Same as TypeInt::make(i) or TypeLong::make(l). | |
| 233 ConINode* intcon(jint i); | |
| 234 ConLNode* longcon(jlong l); | |
| 235 | |
| 236 // Fast zero or null constant. Same as makecon(Type::get_zero_type(bt)). | |
| 237 ConNode* zerocon(BasicType bt); | |
| 238 | |
| 239 // Return a node which computes the same function as this node, but | |
| 240 // in a faster or cheaper fashion. | |
| 241 virtual Node *transform( Node *n ) = 0; | |
| 242 | |
| 243 // Return whether two Nodes are equivalent. | |
| 244 // Must not be recursive, since the recursive version is built from this. | |
| 245 // For pessimistic optimizations this is simply pointer equivalence. | |
| 246 bool eqv(const Node* n1, const Node* n2) const { return n1 == n2; } | |
| 247 | |
| 248 // Return whether two Nodes are equivalent, after stripping casting. | |
| 249 bool eqv_uncast(const Node* n1, const Node* n2) const { | |
| 250 return eqv(n1->uncast(), n2->uncast()); | |
| 251 } | |
| 252 | |
| 253 // For pessimistic passes, the return type must monotonically narrow. | |
| 254 // For optimistic passes, the return type must monotonically widen. | |
| 255 // It is possible to get into a "death march" in either type of pass, | |
| 256 // where the types are continually moving but it will take 2**31 or | |
| 257 // more steps to converge. This doesn't happen on most normal loops. | |
| 258 // | |
| 259 // Here is an example of a deadly loop for an optimistic pass, along | |
| 260 // with a partial trace of inferred types: | |
| 261 // x = phi(0,x'); L: x' = x+1; if (x' >= 0) goto L; | |
| 262 // 0 1 join([0..max], 1) | |
| 263 // [0..1] [1..2] join([0..max], [1..2]) | |
| 264 // [0..2] [1..3] join([0..max], [1..3]) | |
| 265 // ... ... ... | |
| 266 // [0..max] [min]u[1..max] join([0..max], [min..max]) | |
| 267 // [0..max] ==> fixpoint | |
| 268 // We would have proven, the hard way, that the iteration space is all | |
| 269 // non-negative ints, with the loop terminating due to 32-bit overflow. | |
| 270 // | |
| 271 // Here is the corresponding example for a pessimistic pass: | |
| 272 // x = phi(0,x'); L: x' = x-1; if (x' >= 0) goto L; | |
| 273 // int int join([0..max], int) | |
| 274 // [0..max] [-1..max-1] join([0..max], [-1..max-1]) | |
| 275 // [0..max-1] [-1..max-2] join([0..max], [-1..max-2]) | |
| 276 // ... ... ... | |
| 277 // [0..1] [-1..0] join([0..max], [-1..0]) | |
| 278 // 0 -1 join([0..max], -1) | |
| 279 // 0 == fixpoint | |
| 280 // We would have proven, the hard way, that the iteration space is {0}. | |
| 281 // (Usually, other optimizations will make the "if (x >= 0)" fold up | |
| 282 // before we get into trouble. But not always.) | |
| 283 // | |
| 284 // It's a pleasant thing to observe that the pessimistic pass | |
| 285 // will make short work of the optimistic pass's deadly loop, | |
| 286 // and vice versa. That is a good example of the complementary | |
| 287 // purposes of the CCP (optimistic) vs. GVN (pessimistic) phases. | |
| 288 // | |
| 289 // In any case, only widen or narrow a few times before going to the | |
| 290 // correct flavor of top or bottom. | |
| 291 // | |
| 292 // This call only needs to be made once as the data flows around any | |
| 293 // given cycle. We do it at Phis, and nowhere else. | |
| 294 // The types presented are the new type of a phi (computed by PhiNode::Value) | |
| 295 // and the previously computed type, last time the phi was visited. | |
| 296 // | |
| 297 // The third argument is upper limit for the saturated value, | |
| 298 // if the phase wishes to widen the new_type. | |
| 299 // If the phase is narrowing, the old type provides a lower limit. | |
| 300 // Caller guarantees that old_type and new_type are no higher than limit_type. | |
| 301 virtual const Type* saturate(const Type* new_type, const Type* old_type, | |
| 302 const Type* limit_type) const | |
| 303 { ShouldNotCallThis(); return NULL; } | |
| 304 | |
| 305 #ifndef PRODUCT | |
| 306 void dump_old2new_map() const; | |
| 307 void dump_new( uint new_lidx ) const; | |
| 308 void dump_types() const; | |
| 309 void dump_nodes_and_types(const Node *root, uint depth, bool only_ctrl = true); | |
| 310 void dump_nodes_and_types_recur( const Node *n, uint depth, bool only_ctrl, VectorSet &visited); | |
| 311 | |
| 312 uint _count_progress; // For profiling, count transforms that make progress | |
| 313 void set_progress() { ++_count_progress; assert( allow_progress(),"No progress allowed during verification") } | |
| 314 void clear_progress() { _count_progress = 0; } | |
| 315 uint made_progress() const { return _count_progress; } | |
| 316 | |
| 317 uint _count_transforms; // For profiling, count transforms performed | |
| 318 void set_transforms() { ++_count_transforms; } | |
| 319 void clear_transforms() { _count_transforms = 0; } | |
| 320 uint made_transforms() const{ return _count_transforms; } | |
| 321 | |
| 322 bool _allow_progress; // progress not allowed during verification pass | |
| 323 void set_allow_progress(bool allow) { _allow_progress = allow; } | |
| 324 bool allow_progress() { return _allow_progress; } | |
| 325 #endif | |
| 326 }; | |
| 327 | |
| 328 //------------------------------PhaseValues------------------------------------ | |
| 329 // Phase infrastructure to support values | |
| 330 class PhaseValues : public PhaseTransform { | |
| 331 protected: | |
| 332 NodeHash _table; // Hash table for value-numbering | |
| 333 | |
| 334 public: | |
| 335 PhaseValues( Arena *arena, uint est_max_size ); | |
| 336 PhaseValues( PhaseValues *pt ); | |
| 337 PhaseValues( PhaseValues *ptv, const char *dummy ); | |
| 338 NOT_PRODUCT( ~PhaseValues(); ) | |
| 339 virtual PhaseIterGVN *is_IterGVN() { return 0; } | |
| 340 | |
| 341 // Some Ideal and other transforms delete --> modify --> insert values | |
| 342 bool hash_delete(Node *n) { return _table.hash_delete(n); } | |
| 343 void hash_insert(Node *n) { _table.hash_insert(n); } | |
| 344 Node *hash_find_insert(Node *n){ return _table.hash_find_insert(n); } | |
| 345 Node *hash_find(const Node *n) { return _table.hash_find(n); } | |
| 346 | |
| 347 // Used after parsing to eliminate values that are no longer in program | |
| 348 void remove_useless_nodes(VectorSet &useful) { _table.remove_useless_nodes(useful); } | |
| 349 | |
| 350 virtual ConNode* uncached_makecon(const Type* t); // override from PhaseTransform | |
| 351 | |
| 352 virtual const Type* saturate(const Type* new_type, const Type* old_type, | |
| 353 const Type* limit_type) const | |
| 354 { return new_type; } | |
| 355 | |
| 356 #ifndef PRODUCT | |
| 357 uint _count_new_values; // For profiling, count new values produced | |
| 358 void inc_new_values() { ++_count_new_values; } | |
| 359 void clear_new_values() { _count_new_values = 0; } | |
| 360 uint made_new_values() const { return _count_new_values; } | |
| 361 #endif | |
| 362 }; | |
| 363 | |
| 364 | |
| 365 //------------------------------PhaseGVN--------------------------------------- | |
| 366 // Phase for performing local, pessimistic GVN-style optimizations. | |
| 367 class PhaseGVN : public PhaseValues { | |
| 368 public: | |
| 369 PhaseGVN( Arena *arena, uint est_max_size ) : PhaseValues( arena, est_max_size ) {} | |
| 370 PhaseGVN( PhaseGVN *gvn ) : PhaseValues( gvn ) {} | |
| 371 PhaseGVN( PhaseGVN *gvn, const char *dummy ) : PhaseValues( gvn, dummy ) {} | |
| 372 | |
| 373 // Return a node which computes the same function as this node, but | |
| 374 // in a faster or cheaper fashion. | |
| 375 Node *transform( Node *n ); | |
| 376 Node *transform_no_reclaim( Node *n ); | |
| 377 | |
| 378 // Check for a simple dead loop when a data node references itself. | |
| 379 DEBUG_ONLY(void dead_loop_check(Node *n);) | |
| 380 }; | |
| 381 | |
| 382 //------------------------------PhaseIterGVN----------------------------------- | |
| 383 // Phase for iteratively performing local, pessimistic GVN-style optimizations. | |
| 384 // and ideal transformations on the graph. | |
| 385 class PhaseIterGVN : public PhaseGVN { | |
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386 private: |
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387 bool _delay_transform; // When true simply register the node when calling transform |
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388 // instead of actually optimizing it |
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389 |
| 0 | 390 // Idealize old Node 'n' with respect to its inputs and its value |
| 391 virtual Node *transform_old( Node *a_node ); | |
| 392 protected: | |
| 393 | |
| 394 // Idealize new Node 'n' with respect to its inputs and its value | |
| 395 virtual Node *transform( Node *a_node ); | |
| 396 | |
| 397 // Warm up hash table, type table and initial worklist | |
| 398 void init_worklist( Node *a_root ); | |
| 399 | |
| 400 virtual const Type* saturate(const Type* new_type, const Type* old_type, | |
| 401 const Type* limit_type) const; | |
| 402 // Usually returns new_type. Returns old_type if new_type is only a slight | |
| 403 // improvement, such that it would take many (>>10) steps to reach 2**32. | |
| 404 | |
| 405 public: | |
| 406 PhaseIterGVN( PhaseIterGVN *igvn ); // Used by CCP constructor | |
| 407 PhaseIterGVN( PhaseGVN *gvn ); // Used after Parser | |
| 408 PhaseIterGVN( PhaseIterGVN *igvn, const char *dummy ); // Used after +VerifyOpto | |
| 409 | |
| 410 virtual PhaseIterGVN *is_IterGVN() { return this; } | |
| 411 | |
| 412 Unique_Node_List _worklist; // Iterative worklist | |
| 413 | |
| 414 // Given def-use info and an initial worklist, apply Node::Ideal, | |
| 415 // Node::Value, Node::Identity, hash-based value numbering, Node::Ideal_DU | |
| 416 // and dominator info to a fixed point. | |
| 417 void optimize(); | |
| 418 | |
| 419 // Register a new node with the iter GVN pass without transforming it. | |
| 420 // Used when we need to restructure a Region/Phi area and all the Regions | |
| 421 // and Phis need to complete this one big transform before any other | |
| 422 // transforms can be triggered on the region. | |
| 423 // Optional 'orig' is an earlier version of this node. | |
| 424 // It is significant only for debugging and profiling. | |
| 425 Node* register_new_node_with_optimizer(Node* n, Node* orig = NULL); | |
| 426 | |
| 427 // Kill a globally dead Node. It is allowed to have uses which are | |
| 428 // assumed dead and left 'in limbo'. | |
| 429 void remove_globally_dead_node( Node *dead ); | |
| 430 | |
| 431 // Kill all inputs to a dead node, recursively making more dead nodes. | |
| 432 // The Node must be dead locally, i.e., have no uses. | |
| 433 void remove_dead_node( Node *dead ) { | |
| 434 assert(dead->outcnt() == 0 && !dead->is_top(), "node must be dead"); | |
| 435 remove_globally_dead_node(dead); | |
| 436 } | |
| 437 | |
| 438 // Subsume users of node 'old' into node 'nn' | |
| 439 // If no Def-Use info existed for 'nn' it will after call. | |
| 440 void subsume_node( Node *old, Node *nn ); | |
| 441 | |
| 442 // Add users of 'n' to worklist | |
| 443 void add_users_to_worklist0( Node *n ); | |
| 444 void add_users_to_worklist ( Node *n ); | |
| 445 | |
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446 // Replace old node with new one. |
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447 void replace_node( Node *old, Node *nn ) { |
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448 add_users_to_worklist(old); |
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449 hash_delete(old); |
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450 subsume_node(old, nn); |
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451 } |
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452 |
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453 void set_delay_transform(bool delay) { |
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454 _delay_transform = delay; |
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455 } |
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456 |
| 0 | 457 #ifndef PRODUCT |
| 458 protected: | |
| 459 // Sub-quadratic implementation of VerifyIterativeGVN. | |
| 460 unsigned long _verify_counter; | |
| 461 unsigned long _verify_full_passes; | |
| 462 enum { _verify_window_size = 30 }; | |
| 463 Node* _verify_window[_verify_window_size]; | |
| 464 void verify_step(Node* n); | |
| 465 #endif | |
| 466 }; | |
| 467 | |
| 468 //------------------------------PhaseCCP--------------------------------------- | |
| 469 // Phase for performing global Conditional Constant Propagation. | |
| 470 // Should be replaced with combined CCP & GVN someday. | |
| 471 class PhaseCCP : public PhaseIterGVN { | |
| 472 // Non-recursive. Use analysis to transform single Node. | |
| 473 virtual Node *transform_once( Node *n ); | |
| 474 | |
| 475 public: | |
| 476 PhaseCCP( PhaseIterGVN *igvn ); // Compute conditional constants | |
| 477 NOT_PRODUCT( ~PhaseCCP(); ) | |
| 478 | |
| 479 // Worklist algorithm identifies constants | |
| 480 void analyze(); | |
| 481 // Recursive traversal of program. Used analysis to modify program. | |
| 482 virtual Node *transform( Node *n ); | |
| 483 // Do any transformation after analysis | |
| 484 void do_transform(); | |
| 485 | |
| 486 virtual const Type* saturate(const Type* new_type, const Type* old_type, | |
| 487 const Type* limit_type) const; | |
| 488 // Returns new_type->widen(old_type), which increments the widen bits until | |
| 489 // giving up with TypeInt::INT or TypeLong::LONG. | |
| 490 // Result is clipped to limit_type if necessary. | |
| 491 | |
| 492 #ifndef PRODUCT | |
| 493 static uint _total_invokes; // For profiling, count invocations | |
| 494 void inc_invokes() { ++PhaseCCP::_total_invokes; } | |
| 495 | |
| 496 static uint _total_constants; // For profiling, count constants found | |
| 497 uint _count_constants; | |
| 498 void clear_constants() { _count_constants = 0; } | |
| 499 void inc_constants() { ++_count_constants; } | |
| 500 uint count_constants() const { return _count_constants; } | |
| 501 | |
| 502 static void print_statistics(); | |
| 503 #endif | |
| 504 }; | |
| 505 | |
| 506 | |
| 507 //------------------------------PhasePeephole---------------------------------- | |
| 508 // Phase for performing peephole optimizations on register allocated basic blocks. | |
| 509 class PhasePeephole : public PhaseTransform { | |
| 510 PhaseRegAlloc *_regalloc; | |
| 511 PhaseCFG &_cfg; | |
| 512 // Recursive traversal of program. Pure function is unused in this phase | |
| 513 virtual Node *transform( Node *n ); | |
| 514 | |
| 515 public: | |
| 516 PhasePeephole( PhaseRegAlloc *regalloc, PhaseCFG &cfg ); | |
| 517 NOT_PRODUCT( ~PhasePeephole(); ) | |
| 518 | |
| 519 // Do any transformation after analysis | |
| 520 void do_transform(); | |
| 521 | |
| 522 #ifndef PRODUCT | |
| 523 static uint _total_peepholes; // For profiling, count peephole rules applied | |
| 524 uint _count_peepholes; | |
| 525 void clear_peepholes() { _count_peepholes = 0; } | |
| 526 void inc_peepholes() { ++_count_peepholes; } | |
| 527 uint count_peepholes() const { return _count_peepholes; } | |
| 528 | |
| 529 static void print_statistics(); | |
| 530 #endif | |
| 531 }; |