Mercurial > hg > graal-compiler
annotate src/share/vm/opto/superword.hpp @ 6636:0acd345fd810
7160161: Missed safepoint in non-Counted loop
Summary: Do not remove safepoints during peeling optimization.
Reviewed-by: twisti
author | kvn |
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date | Wed, 29 Aug 2012 13:02:40 -0700 |
parents | 6f8f439e247d |
children | 8ae8f9dd7099 |
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0 | 1 /* |
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2 * Copyright (c) 2007, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
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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 | |
1972 | 24 #ifndef SHARE_VM_OPTO_SUPERWORD_HPP |
25 #define SHARE_VM_OPTO_SUPERWORD_HPP | |
26 | |
27 #include "opto/connode.hpp" | |
28 #include "opto/loopnode.hpp" | |
29 #include "opto/node.hpp" | |
30 #include "opto/phaseX.hpp" | |
31 #include "opto/vectornode.hpp" | |
32 #include "utilities/growableArray.hpp" | |
33 | |
0 | 34 // |
35 // S U P E R W O R D T R A N S F O R M | |
36 // | |
37 // SuperWords are short, fixed length vectors. | |
38 // | |
39 // Algorithm from: | |
40 // | |
41 // Exploiting SuperWord Level Parallelism with | |
42 // Multimedia Instruction Sets | |
43 // by | |
44 // Samuel Larsen and Saman Amarasighe | |
45 // MIT Laboratory for Computer Science | |
46 // date | |
47 // May 2000 | |
48 // published in | |
49 // ACM SIGPLAN Notices | |
50 // Proceedings of ACM PLDI '00, Volume 35 Issue 5 | |
51 // | |
52 // Definition 3.1 A Pack is an n-tuple, <s1, ...,sn>, where | |
53 // s1,...,sn are independent isomorphic statements in a basic | |
54 // block. | |
55 // | |
56 // Definition 3.2 A PackSet is a set of Packs. | |
57 // | |
58 // Definition 3.3 A Pair is a Pack of size two, where the | |
59 // first statement is considered the left element, and the | |
60 // second statement is considered the right element. | |
61 | |
62 class SWPointer; | |
63 class OrderedPair; | |
64 | |
65 // ========================= Dependence Graph ===================== | |
66 | |
67 class DepMem; | |
68 | |
69 //------------------------------DepEdge--------------------------- | |
70 // An edge in the dependence graph. The edges incident to a dependence | |
71 // node are threaded through _next_in for incoming edges and _next_out | |
72 // for outgoing edges. | |
73 class DepEdge : public ResourceObj { | |
74 protected: | |
75 DepMem* _pred; | |
76 DepMem* _succ; | |
77 DepEdge* _next_in; // list of in edges, null terminated | |
78 DepEdge* _next_out; // list of out edges, null terminated | |
79 | |
80 public: | |
81 DepEdge(DepMem* pred, DepMem* succ, DepEdge* next_in, DepEdge* next_out) : | |
82 _pred(pred), _succ(succ), _next_in(next_in), _next_out(next_out) {} | |
83 | |
84 DepEdge* next_in() { return _next_in; } | |
85 DepEdge* next_out() { return _next_out; } | |
86 DepMem* pred() { return _pred; } | |
87 DepMem* succ() { return _succ; } | |
88 | |
89 void print(); | |
90 }; | |
91 | |
92 //------------------------------DepMem--------------------------- | |
93 // A node in the dependence graph. _in_head starts the threaded list of | |
94 // incoming edges, and _out_head starts the list of outgoing edges. | |
95 class DepMem : public ResourceObj { | |
96 protected: | |
97 Node* _node; // Corresponding ideal node | |
98 DepEdge* _in_head; // Head of list of in edges, null terminated | |
99 DepEdge* _out_head; // Head of list of out edges, null terminated | |
100 | |
101 public: | |
102 DepMem(Node* node) : _node(node), _in_head(NULL), _out_head(NULL) {} | |
103 | |
104 Node* node() { return _node; } | |
105 DepEdge* in_head() { return _in_head; } | |
106 DepEdge* out_head() { return _out_head; } | |
107 void set_in_head(DepEdge* hd) { _in_head = hd; } | |
108 void set_out_head(DepEdge* hd) { _out_head = hd; } | |
109 | |
110 int in_cnt(); // Incoming edge count | |
111 int out_cnt(); // Outgoing edge count | |
112 | |
113 void print(); | |
114 }; | |
115 | |
116 //------------------------------DepGraph--------------------------- | |
117 class DepGraph VALUE_OBJ_CLASS_SPEC { | |
118 protected: | |
119 Arena* _arena; | |
120 GrowableArray<DepMem*> _map; | |
121 DepMem* _root; | |
122 DepMem* _tail; | |
123 | |
124 public: | |
125 DepGraph(Arena* a) : _arena(a), _map(a, 8, 0, NULL) { | |
126 _root = new (_arena) DepMem(NULL); | |
127 _tail = new (_arena) DepMem(NULL); | |
128 } | |
129 | |
130 DepMem* root() { return _root; } | |
131 DepMem* tail() { return _tail; } | |
132 | |
133 // Return dependence node corresponding to an ideal node | |
134 DepMem* dep(Node* node) { return _map.at(node->_idx); } | |
135 | |
136 // Make a new dependence graph node for an ideal node. | |
137 DepMem* make_node(Node* node); | |
138 | |
139 // Make a new dependence graph edge dprec->dsucc | |
140 DepEdge* make_edge(DepMem* dpred, DepMem* dsucc); | |
141 | |
142 DepEdge* make_edge(Node* pred, Node* succ) { return make_edge(dep(pred), dep(succ)); } | |
143 DepEdge* make_edge(DepMem* pred, Node* succ) { return make_edge(pred, dep(succ)); } | |
144 DepEdge* make_edge(Node* pred, DepMem* succ) { return make_edge(dep(pred), succ); } | |
145 | |
146 void init() { _map.clear(); } // initialize | |
147 | |
148 void print(Node* n) { dep(n)->print(); } | |
149 void print(DepMem* d) { d->print(); } | |
150 }; | |
151 | |
152 //------------------------------DepPreds--------------------------- | |
153 // Iterator over predecessors in the dependence graph and | |
154 // non-memory-graph inputs of ideal nodes. | |
155 class DepPreds : public StackObj { | |
156 private: | |
157 Node* _n; | |
158 int _next_idx, _end_idx; | |
159 DepEdge* _dep_next; | |
160 Node* _current; | |
161 bool _done; | |
162 | |
163 public: | |
164 DepPreds(Node* n, DepGraph& dg); | |
165 Node* current() { return _current; } | |
166 bool done() { return _done; } | |
167 void next(); | |
168 }; | |
169 | |
170 //------------------------------DepSuccs--------------------------- | |
171 // Iterator over successors in the dependence graph and | |
172 // non-memory-graph outputs of ideal nodes. | |
173 class DepSuccs : public StackObj { | |
174 private: | |
175 Node* _n; | |
176 int _next_idx, _end_idx; | |
177 DepEdge* _dep_next; | |
178 Node* _current; | |
179 bool _done; | |
180 | |
181 public: | |
182 DepSuccs(Node* n, DepGraph& dg); | |
183 Node* current() { return _current; } | |
184 bool done() { return _done; } | |
185 void next(); | |
186 }; | |
187 | |
188 | |
189 // ========================= SuperWord ===================== | |
190 | |
191 // -----------------------------SWNodeInfo--------------------------------- | |
192 // Per node info needed by SuperWord | |
193 class SWNodeInfo VALUE_OBJ_CLASS_SPEC { | |
194 public: | |
195 int _alignment; // memory alignment for a node | |
196 int _depth; // Max expression (DAG) depth from block start | |
197 const Type* _velt_type; // vector element type | |
198 Node_List* _my_pack; // pack containing this node | |
199 | |
200 SWNodeInfo() : _alignment(-1), _depth(0), _velt_type(NULL), _my_pack(NULL) {} | |
201 static const SWNodeInfo initial; | |
202 }; | |
203 | |
204 // -----------------------------SuperWord--------------------------------- | |
205 // Transforms scalar operations into packed (superword) operations. | |
206 class SuperWord : public ResourceObj { | |
207 private: | |
208 PhaseIdealLoop* _phase; | |
209 Arena* _arena; | |
210 PhaseIterGVN &_igvn; | |
211 | |
212 enum consts { top_align = -1, bottom_align = -666 }; | |
213 | |
214 GrowableArray<Node_List*> _packset; // Packs for the current block | |
215 | |
216 GrowableArray<int> _bb_idx; // Map from Node _idx to index within block | |
217 | |
218 GrowableArray<Node*> _block; // Nodes in current block | |
219 GrowableArray<Node*> _data_entry; // Nodes with all inputs from outside | |
220 GrowableArray<Node*> _mem_slice_head; // Memory slice head nodes | |
221 GrowableArray<Node*> _mem_slice_tail; // Memory slice tail nodes | |
222 | |
223 GrowableArray<SWNodeInfo> _node_info; // Info needed per node | |
224 | |
225 MemNode* _align_to_ref; // Memory reference that pre-loop will align to | |
226 | |
227 GrowableArray<OrderedPair> _disjoint_ptrs; // runtime disambiguated pointer pairs | |
228 | |
229 DepGraph _dg; // Dependence graph | |
230 | |
231 // Scratch pads | |
232 VectorSet _visited; // Visited set | |
233 VectorSet _post_visited; // Post-visited set | |
234 Node_Stack _n_idx_list; // List of (node,index) pairs | |
235 GrowableArray<Node*> _nlist; // List of nodes | |
236 GrowableArray<Node*> _stk; // Stack of nodes | |
237 | |
238 public: | |
239 SuperWord(PhaseIdealLoop* phase); | |
240 | |
241 void transform_loop(IdealLoopTree* lpt); | |
242 | |
243 // Accessors for SWPointer | |
244 PhaseIdealLoop* phase() { return _phase; } | |
245 IdealLoopTree* lpt() { return _lpt; } | |
246 PhiNode* iv() { return _iv; } | |
247 | |
248 private: | |
249 IdealLoopTree* _lpt; // Current loop tree node | |
250 LoopNode* _lp; // Current LoopNode | |
251 Node* _bb; // Current basic block | |
252 PhiNode* _iv; // Induction var | |
253 | |
254 // Accessors | |
255 Arena* arena() { return _arena; } | |
256 | |
257 Node* bb() { return _bb; } | |
258 void set_bb(Node* bb) { _bb = bb; } | |
259 | |
260 void set_lpt(IdealLoopTree* lpt) { _lpt = lpt; } | |
261 | |
262 LoopNode* lp() { return _lp; } | |
263 void set_lp(LoopNode* lp) { _lp = lp; | |
264 _iv = lp->as_CountedLoop()->phi()->as_Phi(); } | |
265 int iv_stride() { return lp()->as_CountedLoop()->stride_con(); } | |
266 | |
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267 int vector_width(Node* n) { |
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268 BasicType bt = velt_basic_type(n); |
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269 return MIN2(ABS(iv_stride()), Matcher::max_vector_size(bt)); |
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270 } |
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271 int vector_width_in_bytes(Node* n) { |
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272 BasicType bt = velt_basic_type(n); |
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273 return vector_width(n)*type2aelembytes(bt); |
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274 } |
0 | 275 MemNode* align_to_ref() { return _align_to_ref; } |
276 void set_align_to_ref(MemNode* m) { _align_to_ref = m; } | |
277 | |
278 Node* ctrl(Node* n) const { return _phase->has_ctrl(n) ? _phase->get_ctrl(n) : n; } | |
279 | |
280 // block accessors | |
281 bool in_bb(Node* n) { return n != NULL && n->outcnt() > 0 && ctrl(n) == _bb; } | |
282 int bb_idx(Node* n) { assert(in_bb(n), "must be"); return _bb_idx.at(n->_idx); } | |
283 void set_bb_idx(Node* n, int i) { _bb_idx.at_put_grow(n->_idx, i); } | |
284 | |
285 // visited set accessors | |
286 void visited_clear() { _visited.Clear(); } | |
287 void visited_set(Node* n) { return _visited.set(bb_idx(n)); } | |
288 int visited_test(Node* n) { return _visited.test(bb_idx(n)); } | |
289 int visited_test_set(Node* n) { return _visited.test_set(bb_idx(n)); } | |
290 void post_visited_clear() { _post_visited.Clear(); } | |
291 void post_visited_set(Node* n) { return _post_visited.set(bb_idx(n)); } | |
292 int post_visited_test(Node* n) { return _post_visited.test(bb_idx(n)); } | |
293 | |
294 // Ensure node_info contains element "i" | |
295 void grow_node_info(int i) { if (i >= _node_info.length()) _node_info.at_put_grow(i, SWNodeInfo::initial); } | |
296 | |
297 // memory alignment for a node | |
298 int alignment(Node* n) { return _node_info.adr_at(bb_idx(n))->_alignment; } | |
299 void set_alignment(Node* n, int a) { int i = bb_idx(n); grow_node_info(i); _node_info.adr_at(i)->_alignment = a; } | |
300 | |
301 // Max expression (DAG) depth from beginning of the block for each node | |
302 int depth(Node* n) { return _node_info.adr_at(bb_idx(n))->_depth; } | |
303 void set_depth(Node* n, int d) { int i = bb_idx(n); grow_node_info(i); _node_info.adr_at(i)->_depth = d; } | |
304 | |
305 // vector element type | |
306 const Type* velt_type(Node* n) { return _node_info.adr_at(bb_idx(n))->_velt_type; } | |
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307 BasicType velt_basic_type(Node* n) { return velt_type(n)->array_element_basic_type(); } |
0 | 308 void set_velt_type(Node* n, const Type* t) { int i = bb_idx(n); grow_node_info(i); _node_info.adr_at(i)->_velt_type = t; } |
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309 bool same_velt_type(Node* n1, Node* n2); |
0 | 310 |
311 // my_pack | |
312 Node_List* my_pack(Node* n) { return !in_bb(n) ? NULL : _node_info.adr_at(bb_idx(n))->_my_pack; } | |
313 void set_my_pack(Node* n, Node_List* p) { int i = bb_idx(n); grow_node_info(i); _node_info.adr_at(i)->_my_pack = p; } | |
314 | |
315 // methods | |
316 | |
317 // Extract the superword level parallelism | |
318 void SLP_extract(); | |
319 // Find the adjacent memory references and create pack pairs for them. | |
320 void find_adjacent_refs(); | |
321 // Find a memory reference to align the loop induction variable to. | |
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322 MemNode* find_align_to_ref(Node_List &memops); |
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323 // Calculate loop's iv adjustment for this memory ops. |
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324 int get_iv_adjustment(MemNode* mem); |
0 | 325 // Can the preloop align the reference to position zero in the vector? |
326 bool ref_is_alignable(SWPointer& p); | |
327 // Construct dependency graph. | |
328 void dependence_graph(); | |
329 // Return a memory slice (node list) in predecessor order starting at "start" | |
330 void mem_slice_preds(Node* start, Node* stop, GrowableArray<Node*> &preds); | |
605 | 331 // Can s1 and s2 be in a pack with s1 immediately preceding s2 and s1 aligned at "align" |
0 | 332 bool stmts_can_pack(Node* s1, Node* s2, int align); |
333 // Does s exist in a pack at position pos? | |
334 bool exists_at(Node* s, uint pos); | |
335 // Is s1 immediately before s2 in memory? | |
336 bool are_adjacent_refs(Node* s1, Node* s2); | |
337 // Are s1 and s2 similar? | |
338 bool isomorphic(Node* s1, Node* s2); | |
339 // Is there no data path from s1 to s2 or s2 to s1? | |
340 bool independent(Node* s1, Node* s2); | |
341 // Helper for independent | |
342 bool independent_path(Node* shallow, Node* deep, uint dp=0); | |
343 void set_alignment(Node* s1, Node* s2, int align); | |
344 int data_size(Node* s); | |
345 // Extend packset by following use->def and def->use links from pack members. | |
346 void extend_packlist(); | |
347 // Extend the packset by visiting operand definitions of nodes in pack p | |
348 bool follow_use_defs(Node_List* p); | |
349 // Extend the packset by visiting uses of nodes in pack p | |
350 bool follow_def_uses(Node_List* p); | |
351 // Estimate the savings from executing s1 and s2 as a pack | |
352 int est_savings(Node* s1, Node* s2); | |
353 int adjacent_profit(Node* s1, Node* s2); | |
354 int pack_cost(int ct); | |
355 int unpack_cost(int ct); | |
356 // Combine packs A and B with A.last == B.first into A.first..,A.last,B.second,..B.last | |
357 void combine_packs(); | |
358 // Construct the map from nodes to packs. | |
359 void construct_my_pack_map(); | |
360 // Remove packs that are not implemented or not profitable. | |
361 void filter_packs(); | |
362 // Adjust the memory graph for the packed operations | |
363 void schedule(); | |
667 | 364 // Remove "current" from its current position in the memory graph and insert |
365 // it after the appropriate insert points (lip or uip); | |
366 void remove_and_insert(MemNode *current, MemNode *prev, MemNode *lip, Node *uip, Unique_Node_List &schd_before); | |
367 // Within a store pack, schedule stores together by moving out the sandwiched memory ops according | |
368 // to dependence info; and within a load pack, move loads down to the last executed load. | |
0 | 369 void co_locate_pack(Node_List* p); |
370 // Convert packs into vector node operations | |
371 void output(); | |
372 // Create a vector operand for the nodes in pack p for operand: in(opd_idx) | |
3842 | 373 Node* vector_opd(Node_List* p, int opd_idx); |
0 | 374 // Can code be generated for pack p? |
375 bool implemented(Node_List* p); | |
376 // For pack p, are all operands and all uses (with in the block) vector? | |
377 bool profitable(Node_List* p); | |
378 // If a use of pack p is not a vector use, then replace the use with an extract operation. | |
379 void insert_extracts(Node_List* p); | |
380 // Is use->in(u_idx) a vector use? | |
381 bool is_vector_use(Node* use, int u_idx); | |
382 // Construct reverse postorder list of block members | |
383 void construct_bb(); | |
384 // Initialize per node info | |
385 void initialize_bb(); | |
386 // Insert n into block after pos | |
387 void bb_insert_after(Node* n, int pos); | |
388 // Compute max depth for expressions from beginning of block | |
389 void compute_max_depth(); | |
390 // Compute necessary vector element type for expressions | |
391 void compute_vector_element_type(); | |
392 // Are s1 and s2 in a pack pair and ordered as s1,s2? | |
393 bool in_packset(Node* s1, Node* s2); | |
394 // Is s in pack p? | |
395 Node_List* in_pack(Node* s, Node_List* p); | |
396 // Remove the pack at position pos in the packset | |
397 void remove_pack_at(int pos); | |
398 // Return the node executed first in pack p. | |
399 Node* executed_first(Node_List* p); | |
400 // Return the node executed last in pack p. | |
401 Node* executed_last(Node_List* p); | |
402 // Alignment within a vector memory reference | |
403 int memory_alignment(MemNode* s, int iv_adjust_in_bytes); | |
404 // (Start, end] half-open range defining which operands are vector | |
405 void vector_opd_range(Node* n, uint* start, uint* end); | |
406 // Smallest type containing range of values | |
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407 const Type* container_type(Node* n); |
0 | 408 // Adjust pre-loop limit so that in main loop, a load/store reference |
409 // to align_to_ref will be a position zero in the vector. | |
410 void align_initial_loop_index(MemNode* align_to_ref); | |
411 // Find pre loop end from main loop. Returns null if none. | |
412 CountedLoopEndNode* get_pre_loop_end(CountedLoopNode *cl); | |
413 // Is the use of d1 in u1 at the same operand position as d2 in u2? | |
414 bool opnd_positions_match(Node* d1, Node* u1, Node* d2, Node* u2); | |
415 void init(); | |
416 | |
417 // print methods | |
418 void print_packset(); | |
419 void print_pack(Node_List* p); | |
420 void print_bb(); | |
421 void print_stmt(Node* s); | |
422 char* blank(uint depth); | |
423 }; | |
424 | |
425 | |
426 //------------------------------SWPointer--------------------------- | |
427 // Information about an address for dependence checking and vector alignment | |
428 class SWPointer VALUE_OBJ_CLASS_SPEC { | |
429 protected: | |
430 MemNode* _mem; // My memory reference node | |
431 SuperWord* _slp; // SuperWord class | |
432 | |
433 Node* _base; // NULL if unsafe nonheap reference | |
434 Node* _adr; // address pointer | |
435 jint _scale; // multipler for iv (in bytes), 0 if no loop iv | |
436 jint _offset; // constant offset (in bytes) | |
437 Node* _invar; // invariant offset (in bytes), NULL if none | |
438 bool _negate_invar; // if true then use: (0 - _invar) | |
439 | |
440 PhaseIdealLoop* phase() { return _slp->phase(); } | |
441 IdealLoopTree* lpt() { return _slp->lpt(); } | |
442 PhiNode* iv() { return _slp->iv(); } // Induction var | |
443 | |
444 bool invariant(Node* n) { | |
445 Node *n_c = phase()->get_ctrl(n); | |
446 return !lpt()->is_member(phase()->get_loop(n_c)); | |
447 } | |
448 | |
449 // Match: k*iv + offset | |
450 bool scaled_iv_plus_offset(Node* n); | |
451 // Match: k*iv where k is a constant that's not zero | |
452 bool scaled_iv(Node* n); | |
453 // Match: offset is (k [+/- invariant]) | |
454 bool offset_plus_k(Node* n, bool negate = false); | |
455 | |
456 public: | |
457 enum CMP { | |
458 Less = 1, | |
459 Greater = 2, | |
460 Equal = 4, | |
461 NotEqual = (Less | Greater), | |
462 NotComparable = (Less | Greater | Equal) | |
463 }; | |
464 | |
465 SWPointer(MemNode* mem, SuperWord* slp); | |
466 // Following is used to create a temporary object during | |
467 // the pattern match of an address expression. | |
468 SWPointer(SWPointer* p); | |
469 | |
470 bool valid() { return _adr != NULL; } | |
471 bool has_iv() { return _scale != 0; } | |
472 | |
473 Node* base() { return _base; } | |
474 Node* adr() { return _adr; } | |
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475 MemNode* mem() { return _mem; } |
0 | 476 int scale_in_bytes() { return _scale; } |
477 Node* invar() { return _invar; } | |
478 bool negate_invar() { return _negate_invar; } | |
479 int offset_in_bytes() { return _offset; } | |
480 int memory_size() { return _mem->memory_size(); } | |
481 | |
482 // Comparable? | |
483 int cmp(SWPointer& q) { | |
484 if (valid() && q.valid() && | |
485 (_adr == q._adr || _base == _adr && q._base == q._adr) && | |
486 _scale == q._scale && | |
487 _invar == q._invar && | |
488 _negate_invar == q._negate_invar) { | |
489 bool overlap = q._offset < _offset + memory_size() && | |
490 _offset < q._offset + q.memory_size(); | |
491 return overlap ? Equal : (_offset < q._offset ? Less : Greater); | |
492 } else { | |
493 return NotComparable; | |
494 } | |
495 } | |
496 | |
497 bool not_equal(SWPointer& q) { return not_equal(cmp(q)); } | |
498 bool equal(SWPointer& q) { return equal(cmp(q)); } | |
499 bool comparable(SWPointer& q) { return comparable(cmp(q)); } | |
500 static bool not_equal(int cmp) { return cmp <= NotEqual; } | |
501 static bool equal(int cmp) { return cmp == Equal; } | |
502 static bool comparable(int cmp) { return cmp < NotComparable; } | |
503 | |
504 void print(); | |
505 }; | |
506 | |
507 | |
508 //------------------------------OrderedPair--------------------------- | |
509 // Ordered pair of Node*. | |
510 class OrderedPair VALUE_OBJ_CLASS_SPEC { | |
511 protected: | |
512 Node* _p1; | |
513 Node* _p2; | |
514 public: | |
515 OrderedPair() : _p1(NULL), _p2(NULL) {} | |
516 OrderedPair(Node* p1, Node* p2) { | |
517 if (p1->_idx < p2->_idx) { | |
518 _p1 = p1; _p2 = p2; | |
519 } else { | |
520 _p1 = p2; _p2 = p1; | |
521 } | |
522 } | |
523 | |
524 bool operator==(const OrderedPair &rhs) { | |
525 return _p1 == rhs._p1 && _p2 == rhs._p2; | |
526 } | |
527 void print() { tty->print(" (%d, %d)", _p1->_idx, _p2->_idx); } | |
528 | |
529 static const OrderedPair initial; | |
530 }; | |
1972 | 531 |
532 #endif // SHARE_VM_OPTO_SUPERWORD_HPP |