Mercurial > hg > graal-compiler
annotate src/share/vm/opto/superword.cpp @ 1535:d3562366cbfd
6949515: 3/3 VM crash when calling GetMethodDeclaringClass
Summary: Use resolve_external_guard() instead of resolve_non_null().
Reviewed-by: thurka, kamg, acorn
author | dcubed |
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date | Mon, 17 May 2010 06:35:51 -0700 |
parents | 78af5ae8e731 |
children | ace8397c8563 |
rev | line source |
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0 | 1 /* |
579 | 2 * Copyright 2007-2009 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 #include "incls/_precompiled.incl" | |
25 #include "incls/_superword.cpp.incl" | |
26 | |
27 // | |
28 // S U P E R W O R D T R A N S F O R M | |
29 //============================================================================= | |
30 | |
31 //------------------------------SuperWord--------------------------- | |
32 SuperWord::SuperWord(PhaseIdealLoop* phase) : | |
33 _phase(phase), | |
34 _igvn(phase->_igvn), | |
35 _arena(phase->C->comp_arena()), | |
36 _packset(arena(), 8, 0, NULL), // packs for the current block | |
37 _bb_idx(arena(), (int)(1.10 * phase->C->unique()), 0, 0), // node idx to index in bb | |
38 _block(arena(), 8, 0, NULL), // nodes in current block | |
39 _data_entry(arena(), 8, 0, NULL), // nodes with all inputs from outside | |
40 _mem_slice_head(arena(), 8, 0, NULL), // memory slice heads | |
41 _mem_slice_tail(arena(), 8, 0, NULL), // memory slice tails | |
42 _node_info(arena(), 8, 0, SWNodeInfo::initial), // info needed per node | |
43 _align_to_ref(NULL), // memory reference to align vectors to | |
44 _disjoint_ptrs(arena(), 8, 0, OrderedPair::initial), // runtime disambiguated pointer pairs | |
45 _dg(_arena), // dependence graph | |
46 _visited(arena()), // visited node set | |
47 _post_visited(arena()), // post visited node set | |
48 _n_idx_list(arena(), 8), // scratch list of (node,index) pairs | |
49 _stk(arena(), 8, 0, NULL), // scratch stack of nodes | |
50 _nlist(arena(), 8, 0, NULL), // scratch list of nodes | |
51 _lpt(NULL), // loop tree node | |
52 _lp(NULL), // LoopNode | |
53 _bb(NULL), // basic block | |
54 _iv(NULL) // induction var | |
55 {} | |
56 | |
57 //------------------------------transform_loop--------------------------- | |
58 void SuperWord::transform_loop(IdealLoopTree* lpt) { | |
59 assert(lpt->_head->is_CountedLoop(), "must be"); | |
60 CountedLoopNode *cl = lpt->_head->as_CountedLoop(); | |
61 | |
62 if (!cl->is_main_loop() ) return; // skip normal, pre, and post loops | |
63 | |
64 // Check for no control flow in body (other than exit) | |
65 Node *cl_exit = cl->loopexit(); | |
66 if (cl_exit->in(0) != lpt->_head) return; | |
67 | |
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68 // Make sure the are no extra control users of the loop backedge |
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69 if (cl->back_control()->outcnt() != 1) { |
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70 return; |
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71 } |
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72 |
0 | 73 // Check for pre-loop ending with CountedLoopEnd(Bool(Cmp(x,Opaque1(limit)))) |
74 CountedLoopEndNode* pre_end = get_pre_loop_end(cl); | |
75 if (pre_end == NULL) return; | |
76 Node *pre_opaq1 = pre_end->limit(); | |
77 if (pre_opaq1->Opcode() != Op_Opaque1) return; | |
78 | |
79 // Do vectors exist on this architecture? | |
80 if (vector_width_in_bytes() == 0) return; | |
81 | |
82 init(); // initialize data structures | |
83 | |
84 set_lpt(lpt); | |
85 set_lp(cl); | |
86 | |
87 // For now, define one block which is the entire loop body | |
88 set_bb(cl); | |
89 | |
90 assert(_packset.length() == 0, "packset must be empty"); | |
91 SLP_extract(); | |
92 } | |
93 | |
94 //------------------------------SLP_extract--------------------------- | |
95 // Extract the superword level parallelism | |
96 // | |
97 // 1) A reverse post-order of nodes in the block is constructed. By scanning | |
98 // this list from first to last, all definitions are visited before their uses. | |
99 // | |
100 // 2) A point-to-point dependence graph is constructed between memory references. | |
101 // This simplies the upcoming "independence" checker. | |
102 // | |
103 // 3) The maximum depth in the node graph from the beginning of the block | |
104 // to each node is computed. This is used to prune the graph search | |
105 // in the independence checker. | |
106 // | |
107 // 4) For integer types, the necessary bit width is propagated backwards | |
108 // from stores to allow packed operations on byte, char, and short | |
109 // integers. This reverses the promotion to type "int" that javac | |
110 // did for operations like: char c1,c2,c3; c1 = c2 + c3. | |
111 // | |
112 // 5) One of the memory references is picked to be an aligned vector reference. | |
113 // The pre-loop trip count is adjusted to align this reference in the | |
114 // unrolled body. | |
115 // | |
116 // 6) The initial set of pack pairs is seeded with memory references. | |
117 // | |
118 // 7) The set of pack pairs is extended by following use->def and def->use links. | |
119 // | |
120 // 8) The pairs are combined into vector sized packs. | |
121 // | |
122 // 9) Reorder the memory slices to co-locate members of the memory packs. | |
123 // | |
124 // 10) Generate ideal vector nodes for the final set of packs and where necessary, | |
125 // inserting scalar promotion, vector creation from multiple scalars, and | |
126 // extraction of scalar values from vectors. | |
127 // | |
128 void SuperWord::SLP_extract() { | |
129 | |
130 // Ready the block | |
131 | |
132 construct_bb(); | |
133 | |
134 dependence_graph(); | |
135 | |
136 compute_max_depth(); | |
137 | |
138 compute_vector_element_type(); | |
139 | |
140 // Attempt vectorization | |
141 | |
142 find_adjacent_refs(); | |
143 | |
144 extend_packlist(); | |
145 | |
146 combine_packs(); | |
147 | |
148 construct_my_pack_map(); | |
149 | |
150 filter_packs(); | |
151 | |
152 schedule(); | |
153 | |
154 output(); | |
155 } | |
156 | |
157 //------------------------------find_adjacent_refs--------------------------- | |
158 // Find the adjacent memory references and create pack pairs for them. | |
159 // This is the initial set of packs that will then be extended by | |
160 // following use->def and def->use links. The align positions are | |
161 // assigned relative to the reference "align_to_ref" | |
162 void SuperWord::find_adjacent_refs() { | |
163 // Get list of memory operations | |
164 Node_List memops; | |
165 for (int i = 0; i < _block.length(); i++) { | |
166 Node* n = _block.at(i); | |
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167 if (n->is_Mem() && in_bb(n) && |
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168 is_java_primitive(n->as_Mem()->memory_type())) { |
0 | 169 int align = memory_alignment(n->as_Mem(), 0); |
170 if (align != bottom_align) { | |
171 memops.push(n); | |
172 } | |
173 } | |
174 } | |
175 if (memops.size() == 0) return; | |
176 | |
177 // Find a memory reference to align to. The pre-loop trip count | |
178 // is modified to align this reference to a vector-aligned address | |
179 find_align_to_ref(memops); | |
180 if (align_to_ref() == NULL) return; | |
181 | |
182 SWPointer align_to_ref_p(align_to_ref(), this); | |
183 int offset = align_to_ref_p.offset_in_bytes(); | |
184 int scale = align_to_ref_p.scale_in_bytes(); | |
185 int vw = vector_width_in_bytes(); | |
186 int stride_sign = (scale * iv_stride()) > 0 ? 1 : -1; | |
187 int iv_adjustment = (stride_sign * vw - (offset % vw)) % vw; | |
188 | |
189 #ifndef PRODUCT | |
190 if (TraceSuperWord) | |
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191 tty->print_cr("\noffset = %d iv_adjustment = %d elt_align = %d scale = %d iv_stride = %d", |
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192 offset, iv_adjustment, align_to_ref_p.memory_size(), align_to_ref_p.scale_in_bytes(), iv_stride()); |
0 | 193 #endif |
194 | |
195 // Set alignment relative to "align_to_ref" | |
196 for (int i = memops.size() - 1; i >= 0; i--) { | |
197 MemNode* s = memops.at(i)->as_Mem(); | |
198 SWPointer p2(s, this); | |
199 if (p2.comparable(align_to_ref_p)) { | |
200 int align = memory_alignment(s, iv_adjustment); | |
201 set_alignment(s, align); | |
202 } else { | |
203 memops.remove(i); | |
204 } | |
205 } | |
206 | |
207 // Create initial pack pairs of memory operations | |
208 for (uint i = 0; i < memops.size(); i++) { | |
209 Node* s1 = memops.at(i); | |
210 for (uint j = 0; j < memops.size(); j++) { | |
211 Node* s2 = memops.at(j); | |
212 if (s1 != s2 && are_adjacent_refs(s1, s2)) { | |
213 int align = alignment(s1); | |
214 if (stmts_can_pack(s1, s2, align)) { | |
215 Node_List* pair = new Node_List(); | |
216 pair->push(s1); | |
217 pair->push(s2); | |
218 _packset.append(pair); | |
219 } | |
220 } | |
221 } | |
222 } | |
223 | |
224 #ifndef PRODUCT | |
225 if (TraceSuperWord) { | |
226 tty->print_cr("\nAfter find_adjacent_refs"); | |
227 print_packset(); | |
228 } | |
229 #endif | |
230 } | |
231 | |
232 //------------------------------find_align_to_ref--------------------------- | |
233 // Find a memory reference to align the loop induction variable to. | |
234 // Looks first at stores then at loads, looking for a memory reference | |
235 // with the largest number of references similar to it. | |
236 void SuperWord::find_align_to_ref(Node_List &memops) { | |
237 GrowableArray<int> cmp_ct(arena(), memops.size(), memops.size(), 0); | |
238 | |
239 // Count number of comparable memory ops | |
240 for (uint i = 0; i < memops.size(); i++) { | |
241 MemNode* s1 = memops.at(i)->as_Mem(); | |
242 SWPointer p1(s1, this); | |
243 // Discard if pre loop can't align this reference | |
244 if (!ref_is_alignable(p1)) { | |
245 *cmp_ct.adr_at(i) = 0; | |
246 continue; | |
247 } | |
248 for (uint j = i+1; j < memops.size(); j++) { | |
249 MemNode* s2 = memops.at(j)->as_Mem(); | |
250 if (isomorphic(s1, s2)) { | |
251 SWPointer p2(s2, this); | |
252 if (p1.comparable(p2)) { | |
253 (*cmp_ct.adr_at(i))++; | |
254 (*cmp_ct.adr_at(j))++; | |
255 } | |
256 } | |
257 } | |
258 } | |
259 | |
260 // Find Store (or Load) with the greatest number of "comparable" references | |
261 int max_ct = 0; | |
262 int max_idx = -1; | |
263 int min_size = max_jint; | |
264 int min_iv_offset = max_jint; | |
265 for (uint j = 0; j < memops.size(); j++) { | |
266 MemNode* s = memops.at(j)->as_Mem(); | |
267 if (s->is_Store()) { | |
268 SWPointer p(s, this); | |
269 if (cmp_ct.at(j) > max_ct || | |
270 cmp_ct.at(j) == max_ct && (data_size(s) < min_size || | |
271 data_size(s) == min_size && | |
272 p.offset_in_bytes() < min_iv_offset)) { | |
273 max_ct = cmp_ct.at(j); | |
274 max_idx = j; | |
275 min_size = data_size(s); | |
276 min_iv_offset = p.offset_in_bytes(); | |
277 } | |
278 } | |
279 } | |
280 // If no stores, look at loads | |
281 if (max_ct == 0) { | |
282 for (uint j = 0; j < memops.size(); j++) { | |
283 MemNode* s = memops.at(j)->as_Mem(); | |
284 if (s->is_Load()) { | |
285 SWPointer p(s, this); | |
286 if (cmp_ct.at(j) > max_ct || | |
287 cmp_ct.at(j) == max_ct && (data_size(s) < min_size || | |
288 data_size(s) == min_size && | |
289 p.offset_in_bytes() < min_iv_offset)) { | |
290 max_ct = cmp_ct.at(j); | |
291 max_idx = j; | |
292 min_size = data_size(s); | |
293 min_iv_offset = p.offset_in_bytes(); | |
294 } | |
295 } | |
296 } | |
297 } | |
298 | |
299 if (max_ct > 0) | |
300 set_align_to_ref(memops.at(max_idx)->as_Mem()); | |
301 | |
302 #ifndef PRODUCT | |
303 if (TraceSuperWord && Verbose) { | |
304 tty->print_cr("\nVector memops after find_align_to_refs"); | |
305 for (uint i = 0; i < memops.size(); i++) { | |
306 MemNode* s = memops.at(i)->as_Mem(); | |
307 s->dump(); | |
308 } | |
309 } | |
310 #endif | |
311 } | |
312 | |
313 //------------------------------ref_is_alignable--------------------------- | |
314 // Can the preloop align the reference to position zero in the vector? | |
315 bool SuperWord::ref_is_alignable(SWPointer& p) { | |
316 if (!p.has_iv()) { | |
317 return true; // no induction variable | |
318 } | |
319 CountedLoopEndNode* pre_end = get_pre_loop_end(lp()->as_CountedLoop()); | |
320 assert(pre_end->stride_is_con(), "pre loop stride is constant"); | |
321 int preloop_stride = pre_end->stride_con(); | |
322 | |
323 int span = preloop_stride * p.scale_in_bytes(); | |
324 | |
325 // Stride one accesses are alignable. | |
326 if (ABS(span) == p.memory_size()) | |
327 return true; | |
328 | |
329 // If initial offset from start of object is computable, | |
330 // compute alignment within the vector. | |
331 int vw = vector_width_in_bytes(); | |
332 if (vw % span == 0) { | |
333 Node* init_nd = pre_end->init_trip(); | |
334 if (init_nd->is_Con() && p.invar() == NULL) { | |
335 int init = init_nd->bottom_type()->is_int()->get_con(); | |
336 | |
337 int init_offset = init * p.scale_in_bytes() + p.offset_in_bytes(); | |
338 assert(init_offset >= 0, "positive offset from object start"); | |
339 | |
340 if (span > 0) { | |
341 return (vw - (init_offset % vw)) % span == 0; | |
342 } else { | |
343 assert(span < 0, "nonzero stride * scale"); | |
344 return (init_offset % vw) % -span == 0; | |
345 } | |
346 } | |
347 } | |
348 return false; | |
349 } | |
350 | |
351 //---------------------------dependence_graph--------------------------- | |
352 // Construct dependency graph. | |
353 // Add dependence edges to load/store nodes for memory dependence | |
354 // A.out()->DependNode.in(1) and DependNode.out()->B.prec(x) | |
355 void SuperWord::dependence_graph() { | |
356 // First, assign a dependence node to each memory node | |
357 for (int i = 0; i < _block.length(); i++ ) { | |
358 Node *n = _block.at(i); | |
359 if (n->is_Mem() || n->is_Phi() && n->bottom_type() == Type::MEMORY) { | |
360 _dg.make_node(n); | |
361 } | |
362 } | |
363 | |
364 // For each memory slice, create the dependences | |
365 for (int i = 0; i < _mem_slice_head.length(); i++) { | |
366 Node* n = _mem_slice_head.at(i); | |
367 Node* n_tail = _mem_slice_tail.at(i); | |
368 | |
369 // Get slice in predecessor order (last is first) | |
370 mem_slice_preds(n_tail, n, _nlist); | |
371 | |
372 // Make the slice dependent on the root | |
373 DepMem* slice = _dg.dep(n); | |
374 _dg.make_edge(_dg.root(), slice); | |
375 | |
376 // Create a sink for the slice | |
377 DepMem* slice_sink = _dg.make_node(NULL); | |
378 _dg.make_edge(slice_sink, _dg.tail()); | |
379 | |
380 // Now visit each pair of memory ops, creating the edges | |
381 for (int j = _nlist.length() - 1; j >= 0 ; j--) { | |
382 Node* s1 = _nlist.at(j); | |
383 | |
384 // If no dependency yet, use slice | |
385 if (_dg.dep(s1)->in_cnt() == 0) { | |
386 _dg.make_edge(slice, s1); | |
387 } | |
388 SWPointer p1(s1->as_Mem(), this); | |
389 bool sink_dependent = true; | |
390 for (int k = j - 1; k >= 0; k--) { | |
391 Node* s2 = _nlist.at(k); | |
392 if (s1->is_Load() && s2->is_Load()) | |
393 continue; | |
394 SWPointer p2(s2->as_Mem(), this); | |
395 | |
396 int cmp = p1.cmp(p2); | |
397 if (SuperWordRTDepCheck && | |
398 p1.base() != p2.base() && p1.valid() && p2.valid()) { | |
399 // Create a runtime check to disambiguate | |
400 OrderedPair pp(p1.base(), p2.base()); | |
401 _disjoint_ptrs.append_if_missing(pp); | |
402 } else if (!SWPointer::not_equal(cmp)) { | |
403 // Possibly same address | |
404 _dg.make_edge(s1, s2); | |
405 sink_dependent = false; | |
406 } | |
407 } | |
408 if (sink_dependent) { | |
409 _dg.make_edge(s1, slice_sink); | |
410 } | |
411 } | |
412 #ifndef PRODUCT | |
413 if (TraceSuperWord) { | |
414 tty->print_cr("\nDependence graph for slice: %d", n->_idx); | |
415 for (int q = 0; q < _nlist.length(); q++) { | |
416 _dg.print(_nlist.at(q)); | |
417 } | |
418 tty->cr(); | |
419 } | |
420 #endif | |
421 _nlist.clear(); | |
422 } | |
423 | |
424 #ifndef PRODUCT | |
425 if (TraceSuperWord) { | |
426 tty->print_cr("\ndisjoint_ptrs: %s", _disjoint_ptrs.length() > 0 ? "" : "NONE"); | |
427 for (int r = 0; r < _disjoint_ptrs.length(); r++) { | |
428 _disjoint_ptrs.at(r).print(); | |
429 tty->cr(); | |
430 } | |
431 tty->cr(); | |
432 } | |
433 #endif | |
434 } | |
435 | |
436 //---------------------------mem_slice_preds--------------------------- | |
437 // Return a memory slice (node list) in predecessor order starting at "start" | |
438 void SuperWord::mem_slice_preds(Node* start, Node* stop, GrowableArray<Node*> &preds) { | |
439 assert(preds.length() == 0, "start empty"); | |
440 Node* n = start; | |
441 Node* prev = NULL; | |
442 while (true) { | |
443 assert(in_bb(n), "must be in block"); | |
444 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
445 Node* out = n->fast_out(i); | |
446 if (out->is_Load()) { | |
447 if (in_bb(out)) { | |
448 preds.push(out); | |
449 } | |
450 } else { | |
451 // FIXME | |
452 if (out->is_MergeMem() && !in_bb(out)) { | |
453 // Either unrolling is causing a memory edge not to disappear, | |
454 // or need to run igvn.optimize() again before SLP | |
455 } else if (out->is_Phi() && out->bottom_type() == Type::MEMORY && !in_bb(out)) { | |
456 // Ditto. Not sure what else to check further. | |
667 | 457 } else if (out->Opcode() == Op_StoreCM && out->in(MemNode::OopStore) == n) { |
0 | 458 // StoreCM has an input edge used as a precedence edge. |
459 // Maybe an issue when oop stores are vectorized. | |
667 | 460 } else if( out->is_MergeMem() && prev && |
461 prev->Opcode() == Op_StoreCM && out == prev->in(MemNode::OopStore)) { | |
462 // Oop store is a MergeMem! This should not happen. Temporarily remove the assertion | |
463 // for this case because it could not be superwordized anyway. | |
0 | 464 } else { |
465 assert(out == prev || prev == NULL, "no branches off of store slice"); | |
466 } | |
467 } | |
468 } | |
469 if (n == stop) break; | |
470 preds.push(n); | |
471 prev = n; | |
472 n = n->in(MemNode::Memory); | |
473 } | |
474 } | |
475 | |
476 //------------------------------stmts_can_pack--------------------------- | |
605 | 477 // Can s1 and s2 be in a pack with s1 immediately preceding s2 and |
0 | 478 // s1 aligned at "align" |
479 bool SuperWord::stmts_can_pack(Node* s1, Node* s2, int align) { | |
480 if (isomorphic(s1, s2)) { | |
481 if (independent(s1, s2)) { | |
482 if (!exists_at(s1, 0) && !exists_at(s2, 1)) { | |
483 if (!s1->is_Mem() || are_adjacent_refs(s1, s2)) { | |
484 int s1_align = alignment(s1); | |
485 int s2_align = alignment(s2); | |
486 if (s1_align == top_align || s1_align == align) { | |
487 if (s2_align == top_align || s2_align == align + data_size(s1)) { | |
488 return true; | |
489 } | |
490 } | |
491 } | |
492 } | |
493 } | |
494 } | |
495 return false; | |
496 } | |
497 | |
498 //------------------------------exists_at--------------------------- | |
499 // Does s exist in a pack at position pos? | |
500 bool SuperWord::exists_at(Node* s, uint pos) { | |
501 for (int i = 0; i < _packset.length(); i++) { | |
502 Node_List* p = _packset.at(i); | |
503 if (p->at(pos) == s) { | |
504 return true; | |
505 } | |
506 } | |
507 return false; | |
508 } | |
509 | |
510 //------------------------------are_adjacent_refs--------------------------- | |
511 // Is s1 immediately before s2 in memory? | |
512 bool SuperWord::are_adjacent_refs(Node* s1, Node* s2) { | |
513 if (!s1->is_Mem() || !s2->is_Mem()) return false; | |
514 if (!in_bb(s1) || !in_bb(s2)) return false; | |
515 // FIXME - co_locate_pack fails on Stores in different mem-slices, so | |
516 // only pack memops that are in the same alias set until that's fixed. | |
517 if (_phase->C->get_alias_index(s1->as_Mem()->adr_type()) != | |
518 _phase->C->get_alias_index(s2->as_Mem()->adr_type())) | |
519 return false; | |
520 SWPointer p1(s1->as_Mem(), this); | |
521 SWPointer p2(s2->as_Mem(), this); | |
522 if (p1.base() != p2.base() || !p1.comparable(p2)) return false; | |
523 int diff = p2.offset_in_bytes() - p1.offset_in_bytes(); | |
524 return diff == data_size(s1); | |
525 } | |
526 | |
527 //------------------------------isomorphic--------------------------- | |
528 // Are s1 and s2 similar? | |
529 bool SuperWord::isomorphic(Node* s1, Node* s2) { | |
530 if (s1->Opcode() != s2->Opcode()) return false; | |
531 if (s1->req() != s2->req()) return false; | |
532 if (s1->in(0) != s2->in(0)) return false; | |
533 if (velt_type(s1) != velt_type(s2)) return false; | |
534 return true; | |
535 } | |
536 | |
537 //------------------------------independent--------------------------- | |
538 // Is there no data path from s1 to s2 or s2 to s1? | |
539 bool SuperWord::independent(Node* s1, Node* s2) { | |
540 // assert(s1->Opcode() == s2->Opcode(), "check isomorphic first"); | |
541 int d1 = depth(s1); | |
542 int d2 = depth(s2); | |
543 if (d1 == d2) return s1 != s2; | |
544 Node* deep = d1 > d2 ? s1 : s2; | |
545 Node* shallow = d1 > d2 ? s2 : s1; | |
546 | |
547 visited_clear(); | |
548 | |
549 return independent_path(shallow, deep); | |
550 } | |
551 | |
552 //------------------------------independent_path------------------------------ | |
553 // Helper for independent | |
554 bool SuperWord::independent_path(Node* shallow, Node* deep, uint dp) { | |
555 if (dp >= 1000) return false; // stop deep recursion | |
556 visited_set(deep); | |
557 int shal_depth = depth(shallow); | |
558 assert(shal_depth <= depth(deep), "must be"); | |
559 for (DepPreds preds(deep, _dg); !preds.done(); preds.next()) { | |
560 Node* pred = preds.current(); | |
561 if (in_bb(pred) && !visited_test(pred)) { | |
562 if (shallow == pred) { | |
563 return false; | |
564 } | |
565 if (shal_depth < depth(pred) && !independent_path(shallow, pred, dp+1)) { | |
566 return false; | |
567 } | |
568 } | |
569 } | |
570 return true; | |
571 } | |
572 | |
573 //------------------------------set_alignment--------------------------- | |
574 void SuperWord::set_alignment(Node* s1, Node* s2, int align) { | |
575 set_alignment(s1, align); | |
576 set_alignment(s2, align + data_size(s1)); | |
577 } | |
578 | |
579 //------------------------------data_size--------------------------- | |
580 int SuperWord::data_size(Node* s) { | |
581 const Type* t = velt_type(s); | |
582 BasicType bt = t->array_element_basic_type(); | |
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583 int bsize = type2aelembytes(bt); |
0 | 584 assert(bsize != 0, "valid size"); |
585 return bsize; | |
586 } | |
587 | |
588 //------------------------------extend_packlist--------------------------- | |
589 // Extend packset by following use->def and def->use links from pack members. | |
590 void SuperWord::extend_packlist() { | |
591 bool changed; | |
592 do { | |
593 changed = false; | |
594 for (int i = 0; i < _packset.length(); i++) { | |
595 Node_List* p = _packset.at(i); | |
596 changed |= follow_use_defs(p); | |
597 changed |= follow_def_uses(p); | |
598 } | |
599 } while (changed); | |
600 | |
601 #ifndef PRODUCT | |
602 if (TraceSuperWord) { | |
603 tty->print_cr("\nAfter extend_packlist"); | |
604 print_packset(); | |
605 } | |
606 #endif | |
607 } | |
608 | |
609 //------------------------------follow_use_defs--------------------------- | |
610 // Extend the packset by visiting operand definitions of nodes in pack p | |
611 bool SuperWord::follow_use_defs(Node_List* p) { | |
612 Node* s1 = p->at(0); | |
613 Node* s2 = p->at(1); | |
614 assert(p->size() == 2, "just checking"); | |
615 assert(s1->req() == s2->req(), "just checking"); | |
616 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); | |
617 | |
618 if (s1->is_Load()) return false; | |
619 | |
620 int align = alignment(s1); | |
621 bool changed = false; | |
622 int start = s1->is_Store() ? MemNode::ValueIn : 1; | |
623 int end = s1->is_Store() ? MemNode::ValueIn+1 : s1->req(); | |
624 for (int j = start; j < end; j++) { | |
625 Node* t1 = s1->in(j); | |
626 Node* t2 = s2->in(j); | |
627 if (!in_bb(t1) || !in_bb(t2)) | |
628 continue; | |
629 if (stmts_can_pack(t1, t2, align)) { | |
630 if (est_savings(t1, t2) >= 0) { | |
631 Node_List* pair = new Node_List(); | |
632 pair->push(t1); | |
633 pair->push(t2); | |
634 _packset.append(pair); | |
635 set_alignment(t1, t2, align); | |
636 changed = true; | |
637 } | |
638 } | |
639 } | |
640 return changed; | |
641 } | |
642 | |
643 //------------------------------follow_def_uses--------------------------- | |
644 // Extend the packset by visiting uses of nodes in pack p | |
645 bool SuperWord::follow_def_uses(Node_List* p) { | |
646 bool changed = false; | |
647 Node* s1 = p->at(0); | |
648 Node* s2 = p->at(1); | |
649 assert(p->size() == 2, "just checking"); | |
650 assert(s1->req() == s2->req(), "just checking"); | |
651 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); | |
652 | |
653 if (s1->is_Store()) return false; | |
654 | |
655 int align = alignment(s1); | |
656 int savings = -1; | |
657 Node* u1 = NULL; | |
658 Node* u2 = NULL; | |
659 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { | |
660 Node* t1 = s1->fast_out(i); | |
661 if (!in_bb(t1)) continue; | |
662 for (DUIterator_Fast jmax, j = s2->fast_outs(jmax); j < jmax; j++) { | |
663 Node* t2 = s2->fast_out(j); | |
664 if (!in_bb(t2)) continue; | |
665 if (!opnd_positions_match(s1, t1, s2, t2)) | |
666 continue; | |
667 if (stmts_can_pack(t1, t2, align)) { | |
668 int my_savings = est_savings(t1, t2); | |
669 if (my_savings > savings) { | |
670 savings = my_savings; | |
671 u1 = t1; | |
672 u2 = t2; | |
673 } | |
674 } | |
675 } | |
676 } | |
677 if (savings >= 0) { | |
678 Node_List* pair = new Node_List(); | |
679 pair->push(u1); | |
680 pair->push(u2); | |
681 _packset.append(pair); | |
682 set_alignment(u1, u2, align); | |
683 changed = true; | |
684 } | |
685 return changed; | |
686 } | |
687 | |
688 //---------------------------opnd_positions_match------------------------- | |
689 // Is the use of d1 in u1 at the same operand position as d2 in u2? | |
690 bool SuperWord::opnd_positions_match(Node* d1, Node* u1, Node* d2, Node* u2) { | |
691 uint ct = u1->req(); | |
692 if (ct != u2->req()) return false; | |
693 uint i1 = 0; | |
694 uint i2 = 0; | |
695 do { | |
696 for (i1++; i1 < ct; i1++) if (u1->in(i1) == d1) break; | |
697 for (i2++; i2 < ct; i2++) if (u2->in(i2) == d2) break; | |
698 if (i1 != i2) { | |
699 return false; | |
700 } | |
701 } while (i1 < ct); | |
702 return true; | |
703 } | |
704 | |
705 //------------------------------est_savings--------------------------- | |
706 // Estimate the savings from executing s1 and s2 as a pack | |
707 int SuperWord::est_savings(Node* s1, Node* s2) { | |
708 int save = 2 - 1; // 2 operations per instruction in packed form | |
709 | |
710 // inputs | |
711 for (uint i = 1; i < s1->req(); i++) { | |
712 Node* x1 = s1->in(i); | |
713 Node* x2 = s2->in(i); | |
714 if (x1 != x2) { | |
715 if (are_adjacent_refs(x1, x2)) { | |
716 save += adjacent_profit(x1, x2); | |
717 } else if (!in_packset(x1, x2)) { | |
718 save -= pack_cost(2); | |
719 } else { | |
720 save += unpack_cost(2); | |
721 } | |
722 } | |
723 } | |
724 | |
725 // uses of result | |
726 uint ct = 0; | |
727 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { | |
728 Node* s1_use = s1->fast_out(i); | |
729 for (int j = 0; j < _packset.length(); j++) { | |
730 Node_List* p = _packset.at(j); | |
731 if (p->at(0) == s1_use) { | |
732 for (DUIterator_Fast kmax, k = s2->fast_outs(kmax); k < kmax; k++) { | |
733 Node* s2_use = s2->fast_out(k); | |
734 if (p->at(p->size()-1) == s2_use) { | |
735 ct++; | |
736 if (are_adjacent_refs(s1_use, s2_use)) { | |
737 save += adjacent_profit(s1_use, s2_use); | |
738 } | |
739 } | |
740 } | |
741 } | |
742 } | |
743 } | |
744 | |
745 if (ct < s1->outcnt()) save += unpack_cost(1); | |
746 if (ct < s2->outcnt()) save += unpack_cost(1); | |
747 | |
748 return save; | |
749 } | |
750 | |
751 //------------------------------costs--------------------------- | |
752 int SuperWord::adjacent_profit(Node* s1, Node* s2) { return 2; } | |
753 int SuperWord::pack_cost(int ct) { return ct; } | |
754 int SuperWord::unpack_cost(int ct) { return ct; } | |
755 | |
756 //------------------------------combine_packs--------------------------- | |
757 // Combine packs A and B with A.last == B.first into A.first..,A.last,B.second,..B.last | |
758 void SuperWord::combine_packs() { | |
759 bool changed; | |
760 do { | |
761 changed = false; | |
762 for (int i = 0; i < _packset.length(); i++) { | |
763 Node_List* p1 = _packset.at(i); | |
764 if (p1 == NULL) continue; | |
765 for (int j = 0; j < _packset.length(); j++) { | |
766 Node_List* p2 = _packset.at(j); | |
767 if (p2 == NULL) continue; | |
768 if (p1->at(p1->size()-1) == p2->at(0)) { | |
769 for (uint k = 1; k < p2->size(); k++) { | |
770 p1->push(p2->at(k)); | |
771 } | |
772 _packset.at_put(j, NULL); | |
773 changed = true; | |
774 } | |
775 } | |
776 } | |
777 } while (changed); | |
778 | |
779 for (int i = _packset.length() - 1; i >= 0; i--) { | |
780 Node_List* p1 = _packset.at(i); | |
781 if (p1 == NULL) { | |
782 _packset.remove_at(i); | |
783 } | |
784 } | |
785 | |
786 #ifndef PRODUCT | |
787 if (TraceSuperWord) { | |
788 tty->print_cr("\nAfter combine_packs"); | |
789 print_packset(); | |
790 } | |
791 #endif | |
792 } | |
793 | |
794 //-----------------------------construct_my_pack_map-------------------------- | |
795 // Construct the map from nodes to packs. Only valid after the | |
796 // point where a node is only in one pack (after combine_packs). | |
797 void SuperWord::construct_my_pack_map() { | |
798 Node_List* rslt = NULL; | |
799 for (int i = 0; i < _packset.length(); i++) { | |
800 Node_List* p = _packset.at(i); | |
801 for (uint j = 0; j < p->size(); j++) { | |
802 Node* s = p->at(j); | |
803 assert(my_pack(s) == NULL, "only in one pack"); | |
804 set_my_pack(s, p); | |
805 } | |
806 } | |
807 } | |
808 | |
809 //------------------------------filter_packs--------------------------- | |
810 // Remove packs that are not implemented or not profitable. | |
811 void SuperWord::filter_packs() { | |
812 | |
813 // Remove packs that are not implemented | |
814 for (int i = _packset.length() - 1; i >= 0; i--) { | |
815 Node_List* pk = _packset.at(i); | |
816 bool impl = implemented(pk); | |
817 if (!impl) { | |
818 #ifndef PRODUCT | |
819 if (TraceSuperWord && Verbose) { | |
820 tty->print_cr("Unimplemented"); | |
821 pk->at(0)->dump(); | |
822 } | |
823 #endif | |
824 remove_pack_at(i); | |
825 } | |
826 } | |
827 | |
828 // Remove packs that are not profitable | |
829 bool changed; | |
830 do { | |
831 changed = false; | |
832 for (int i = _packset.length() - 1; i >= 0; i--) { | |
833 Node_List* pk = _packset.at(i); | |
834 bool prof = profitable(pk); | |
835 if (!prof) { | |
836 #ifndef PRODUCT | |
837 if (TraceSuperWord && Verbose) { | |
838 tty->print_cr("Unprofitable"); | |
839 pk->at(0)->dump(); | |
840 } | |
841 #endif | |
842 remove_pack_at(i); | |
843 changed = true; | |
844 } | |
845 } | |
846 } while (changed); | |
847 | |
848 #ifndef PRODUCT | |
849 if (TraceSuperWord) { | |
850 tty->print_cr("\nAfter filter_packs"); | |
851 print_packset(); | |
852 tty->cr(); | |
853 } | |
854 #endif | |
855 } | |
856 | |
857 //------------------------------implemented--------------------------- | |
858 // Can code be generated for pack p? | |
859 bool SuperWord::implemented(Node_List* p) { | |
860 Node* p0 = p->at(0); | |
861 int vopc = VectorNode::opcode(p0->Opcode(), p->size(), velt_type(p0)); | |
862 return vopc > 0 && Matcher::has_match_rule(vopc); | |
863 } | |
864 | |
865 //------------------------------profitable--------------------------- | |
866 // For pack p, are all operands and all uses (with in the block) vector? | |
867 bool SuperWord::profitable(Node_List* p) { | |
868 Node* p0 = p->at(0); | |
869 uint start, end; | |
870 vector_opd_range(p0, &start, &end); | |
871 | |
872 // Return false if some input is not vector and inside block | |
873 for (uint i = start; i < end; i++) { | |
874 if (!is_vector_use(p0, i)) { | |
875 // For now, return false if not scalar promotion case (inputs are the same.) | |
605 | 876 // Later, implement PackNode and allow differing, non-vector inputs |
0 | 877 // (maybe just the ones from outside the block.) |
878 Node* p0_def = p0->in(i); | |
879 for (uint j = 1; j < p->size(); j++) { | |
880 Node* use = p->at(j); | |
881 Node* def = use->in(i); | |
882 if (p0_def != def) | |
883 return false; | |
884 } | |
885 } | |
886 } | |
887 if (!p0->is_Store()) { | |
888 // For now, return false if not all uses are vector. | |
889 // Later, implement ExtractNode and allow non-vector uses (maybe | |
890 // just the ones outside the block.) | |
891 for (uint i = 0; i < p->size(); i++) { | |
892 Node* def = p->at(i); | |
893 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { | |
894 Node* use = def->fast_out(j); | |
895 for (uint k = 0; k < use->req(); k++) { | |
896 Node* n = use->in(k); | |
897 if (def == n) { | |
898 if (!is_vector_use(use, k)) { | |
899 return false; | |
900 } | |
901 } | |
902 } | |
903 } | |
904 } | |
905 } | |
906 return true; | |
907 } | |
908 | |
909 //------------------------------schedule--------------------------- | |
910 // Adjust the memory graph for the packed operations | |
911 void SuperWord::schedule() { | |
912 | |
913 // Co-locate in the memory graph the members of each memory pack | |
914 for (int i = 0; i < _packset.length(); i++) { | |
915 co_locate_pack(_packset.at(i)); | |
916 } | |
917 } | |
918 | |
667 | 919 //-------------------------------remove_and_insert------------------- |
920 //remove "current" from its current position in the memory graph and insert | |
921 //it after the appropriate insertion point (lip or uip) | |
922 void SuperWord::remove_and_insert(MemNode *current, MemNode *prev, MemNode *lip, | |
923 Node *uip, Unique_Node_List &sched_before) { | |
924 Node* my_mem = current->in(MemNode::Memory); | |
925 _igvn.hash_delete(current); | |
926 _igvn.hash_delete(my_mem); | |
927 | |
928 //remove current_store from its current position in the memmory graph | |
929 for (DUIterator i = current->outs(); current->has_out(i); i++) { | |
930 Node* use = current->out(i); | |
931 if (use->is_Mem()) { | |
932 assert(use->in(MemNode::Memory) == current, "must be"); | |
933 _igvn.hash_delete(use); | |
934 if (use == prev) { // connect prev to my_mem | |
935 use->set_req(MemNode::Memory, my_mem); | |
936 } else if (sched_before.member(use)) { | |
937 _igvn.hash_delete(uip); | |
938 use->set_req(MemNode::Memory, uip); | |
939 } else { | |
940 _igvn.hash_delete(lip); | |
941 use->set_req(MemNode::Memory, lip); | |
942 } | |
943 _igvn._worklist.push(use); | |
944 --i; //deleted this edge; rescan position | |
945 } | |
946 } | |
947 | |
948 bool sched_up = sched_before.member(current); | |
949 Node *insert_pt = sched_up ? uip : lip; | |
950 _igvn.hash_delete(insert_pt); | |
951 | |
952 // all uses of insert_pt's memory state should use current's instead | |
953 for (DUIterator i = insert_pt->outs(); insert_pt->has_out(i); i++) { | |
954 Node* use = insert_pt->out(i); | |
955 if (use->is_Mem()) { | |
956 assert(use->in(MemNode::Memory) == insert_pt, "must be"); | |
957 _igvn.hash_delete(use); | |
958 use->set_req(MemNode::Memory, current); | |
959 _igvn._worklist.push(use); | |
960 --i; //deleted this edge; rescan position | |
961 } else if (!sched_up && use->is_Phi() && use->bottom_type() == Type::MEMORY) { | |
962 uint pos; //lip (lower insert point) must be the last one in the memory slice | |
963 _igvn.hash_delete(use); | |
964 for (pos=1; pos < use->req(); pos++) { | |
965 if (use->in(pos) == insert_pt) break; | |
966 } | |
967 use->set_req(pos, current); | |
968 _igvn._worklist.push(use); | |
969 --i; | |
970 } | |
971 } | |
972 | |
973 //connect current to insert_pt | |
974 current->set_req(MemNode::Memory, insert_pt); | |
975 _igvn._worklist.push(current); | |
976 } | |
977 | |
978 //------------------------------co_locate_pack---------------------------------- | |
979 // To schedule a store pack, we need to move any sandwiched memory ops either before | |
980 // or after the pack, based upon dependence information: | |
981 // (1) If any store in the pack depends on the sandwiched memory op, the | |
982 // sandwiched memory op must be scheduled BEFORE the pack; | |
983 // (2) If a sandwiched memory op depends on any store in the pack, the | |
984 // sandwiched memory op must be scheduled AFTER the pack; | |
985 // (3) If a sandwiched memory op (say, memA) depends on another sandwiched | |
986 // memory op (say memB), memB must be scheduled before memA. So, if memA is | |
987 // scheduled before the pack, memB must also be scheduled before the pack; | |
988 // (4) If there is no dependence restriction for a sandwiched memory op, we simply | |
989 // schedule this store AFTER the pack | |
990 // (5) We know there is no dependence cycle, so there in no other case; | |
991 // (6) Finally, all memory ops in another single pack should be moved in the same direction. | |
992 // | |
993 // To schedule a load pack: the memory edge of every loads in the pack must be | |
994 // the same as the memory edge of the last executed load in the pack | |
0 | 995 void SuperWord::co_locate_pack(Node_List* pk) { |
996 if (pk->at(0)->is_Store()) { | |
997 MemNode* first = executed_first(pk)->as_Mem(); | |
998 MemNode* last = executed_last(pk)->as_Mem(); | |
667 | 999 Unique_Node_List schedule_before_pack; |
1000 Unique_Node_List memops; | |
1001 | |
0 | 1002 MemNode* current = last->in(MemNode::Memory)->as_Mem(); |
667 | 1003 MemNode* previous = last; |
0 | 1004 while (true) { |
1005 assert(in_bb(current), "stay in block"); | |
667 | 1006 memops.push(previous); |
1007 for (DUIterator i = current->outs(); current->has_out(i); i++) { | |
1008 Node* use = current->out(i); | |
1009 if (use->is_Mem() && use != previous) | |
1010 memops.push(use); | |
1011 } | |
1012 if(current == first) break; | |
1013 previous = current; | |
1014 current = current->in(MemNode::Memory)->as_Mem(); | |
1015 } | |
1016 | |
1017 // determine which memory operations should be scheduled before the pack | |
1018 for (uint i = 1; i < memops.size(); i++) { | |
1019 Node *s1 = memops.at(i); | |
1020 if (!in_pack(s1, pk) && !schedule_before_pack.member(s1)) { | |
1021 for (uint j = 0; j< i; j++) { | |
1022 Node *s2 = memops.at(j); | |
1023 if (!independent(s1, s2)) { | |
1024 if (in_pack(s2, pk) || schedule_before_pack.member(s2)) { | |
1025 schedule_before_pack.push(s1); //s1 must be scheduled before | |
1026 Node_List* mem_pk = my_pack(s1); | |
1027 if (mem_pk != NULL) { | |
1028 for (uint ii = 0; ii < mem_pk->size(); ii++) { | |
1029 Node* s = mem_pk->at(ii); // follow partner | |
1030 if (memops.member(s) && !schedule_before_pack.member(s)) | |
1031 schedule_before_pack.push(s); | |
1032 } | |
1033 } | |
1034 } | |
1035 } | |
1036 } | |
1037 } | |
1038 } | |
1039 | |
1040 MemNode* lower_insert_pt = last; | |
1041 Node* upper_insert_pt = first->in(MemNode::Memory); | |
1042 previous = last; //previous store in pk | |
1043 current = last->in(MemNode::Memory)->as_Mem(); | |
1044 | |
1045 //start scheduling from "last" to "first" | |
1046 while (true) { | |
1047 assert(in_bb(current), "stay in block"); | |
1048 assert(in_pack(previous, pk), "previous stays in pack"); | |
0 | 1049 Node* my_mem = current->in(MemNode::Memory); |
667 | 1050 |
0 | 1051 if (in_pack(current, pk)) { |
667 | 1052 // Forward users of my memory state (except "previous) to my input memory state |
0 | 1053 _igvn.hash_delete(current); |
1054 for (DUIterator i = current->outs(); current->has_out(i); i++) { | |
1055 Node* use = current->out(i); | |
667 | 1056 if (use->is_Mem() && use != previous) { |
0 | 1057 assert(use->in(MemNode::Memory) == current, "must be"); |
1058 _igvn.hash_delete(use); | |
667 | 1059 if (schedule_before_pack.member(use)) { |
1060 _igvn.hash_delete(upper_insert_pt); | |
1061 use->set_req(MemNode::Memory, upper_insert_pt); | |
1062 } else { | |
1063 _igvn.hash_delete(lower_insert_pt); | |
1064 use->set_req(MemNode::Memory, lower_insert_pt); | |
1065 } | |
0 | 1066 _igvn._worklist.push(use); |
1067 --i; // deleted this edge; rescan position | |
1068 } | |
1069 } | |
667 | 1070 previous = current; |
1071 } else { // !in_pack(current, pk) ==> a sandwiched store | |
1072 remove_and_insert(current, previous, lower_insert_pt, upper_insert_pt, schedule_before_pack); | |
0 | 1073 } |
667 | 1074 |
0 | 1075 if (current == first) break; |
1076 current = my_mem->as_Mem(); | |
667 | 1077 } // end while |
1078 } else if (pk->at(0)->is_Load()) { //load | |
1079 // all use the memory state that the last executed load uses | |
1080 LoadNode* last_load = executed_last(pk)->as_Load(); | |
1081 Node* last_mem = last_load->in(MemNode::Memory); | |
1082 _igvn.hash_delete(last_mem); | |
1083 // Give each load same memory state as last | |
0 | 1084 for (uint i = 0; i < pk->size(); i++) { |
1085 LoadNode* ld = pk->at(i)->as_Load(); | |
1086 _igvn.hash_delete(ld); | |
667 | 1087 ld->set_req(MemNode::Memory, last_mem); |
0 | 1088 _igvn._worklist.push(ld); |
1089 } | |
1090 } | |
1091 } | |
1092 | |
1093 //------------------------------output--------------------------- | |
1094 // Convert packs into vector node operations | |
1095 void SuperWord::output() { | |
1096 if (_packset.length() == 0) return; | |
1097 | |
1098 // MUST ENSURE main loop's initial value is properly aligned: | |
1099 // (iv_initial_value + min_iv_offset) % vector_width_in_bytes() == 0 | |
1100 | |
1101 align_initial_loop_index(align_to_ref()); | |
1102 | |
1103 // Insert extract (unpack) operations for scalar uses | |
1104 for (int i = 0; i < _packset.length(); i++) { | |
1105 insert_extracts(_packset.at(i)); | |
1106 } | |
1107 | |
1108 for (int i = 0; i < _block.length(); i++) { | |
1109 Node* n = _block.at(i); | |
1110 Node_List* p = my_pack(n); | |
1111 if (p && n == executed_last(p)) { | |
1112 uint vlen = p->size(); | |
1113 Node* vn = NULL; | |
1114 Node* low_adr = p->at(0); | |
1115 Node* first = executed_first(p); | |
1116 if (n->is_Load()) { | |
1117 int opc = n->Opcode(); | |
1118 Node* ctl = n->in(MemNode::Control); | |
1119 Node* mem = first->in(MemNode::Memory); | |
1120 Node* adr = low_adr->in(MemNode::Address); | |
1121 const TypePtr* atyp = n->adr_type(); | |
1122 vn = VectorLoadNode::make(_phase->C, opc, ctl, mem, adr, atyp, vlen); | |
1123 | |
1124 } else if (n->is_Store()) { | |
1125 // Promote value to be stored to vector | |
1126 VectorNode* val = vector_opd(p, MemNode::ValueIn); | |
1127 | |
1128 int opc = n->Opcode(); | |
1129 Node* ctl = n->in(MemNode::Control); | |
1130 Node* mem = first->in(MemNode::Memory); | |
1131 Node* adr = low_adr->in(MemNode::Address); | |
1132 const TypePtr* atyp = n->adr_type(); | |
1133 vn = VectorStoreNode::make(_phase->C, opc, ctl, mem, adr, atyp, val, vlen); | |
1134 | |
1135 } else if (n->req() == 3) { | |
1136 // Promote operands to vector | |
1137 Node* in1 = vector_opd(p, 1); | |
1138 Node* in2 = vector_opd(p, 2); | |
1139 vn = VectorNode::make(_phase->C, n->Opcode(), in1, in2, vlen, velt_type(n)); | |
1140 | |
1141 } else { | |
1142 ShouldNotReachHere(); | |
1143 } | |
1144 | |
1145 _phase->_igvn.register_new_node_with_optimizer(vn); | |
1146 _phase->set_ctrl(vn, _phase->get_ctrl(p->at(0))); | |
1147 for (uint j = 0; j < p->size(); j++) { | |
1148 Node* pm = p->at(j); | |
1149 _igvn.hash_delete(pm); | |
1150 _igvn.subsume_node(pm, vn); | |
1151 } | |
1152 _igvn._worklist.push(vn); | |
1153 } | |
1154 } | |
1155 } | |
1156 | |
1157 //------------------------------vector_opd--------------------------- | |
1158 // Create a vector operand for the nodes in pack p for operand: in(opd_idx) | |
1159 VectorNode* SuperWord::vector_opd(Node_List* p, int opd_idx) { | |
1160 Node* p0 = p->at(0); | |
1161 uint vlen = p->size(); | |
1162 Node* opd = p0->in(opd_idx); | |
1163 | |
1164 bool same_opd = true; | |
1165 for (uint i = 1; i < vlen; i++) { | |
1166 Node* pi = p->at(i); | |
1167 Node* in = pi->in(opd_idx); | |
1168 if (opd != in) { | |
1169 same_opd = false; | |
1170 break; | |
1171 } | |
1172 } | |
1173 | |
1174 if (same_opd) { | |
1175 if (opd->is_Vector()) { | |
1176 return (VectorNode*)opd; // input is matching vector | |
1177 } | |
1178 // Convert scalar input to vector. Use p0's type because it's container | |
1179 // maybe smaller than the operand's container. | |
1180 const Type* opd_t = velt_type(!in_bb(opd) ? p0 : opd); | |
1181 const Type* p0_t = velt_type(p0); | |
1182 if (p0_t->higher_equal(opd_t)) opd_t = p0_t; | |
1183 VectorNode* vn = VectorNode::scalar2vector(_phase->C, opd, vlen, opd_t); | |
1184 | |
1185 _phase->_igvn.register_new_node_with_optimizer(vn); | |
1186 _phase->set_ctrl(vn, _phase->get_ctrl(opd)); | |
1187 return vn; | |
1188 } | |
1189 | |
1190 // Insert pack operation | |
1191 const Type* opd_t = velt_type(!in_bb(opd) ? p0 : opd); | |
1192 PackNode* pk = PackNode::make(_phase->C, opd, opd_t); | |
1193 | |
1194 for (uint i = 1; i < vlen; i++) { | |
1195 Node* pi = p->at(i); | |
1196 Node* in = pi->in(opd_idx); | |
1197 assert(my_pack(in) == NULL, "Should already have been unpacked"); | |
1198 assert(opd_t == velt_type(!in_bb(in) ? pi : in), "all same type"); | |
1199 pk->add_opd(in); | |
1200 } | |
1201 _phase->_igvn.register_new_node_with_optimizer(pk); | |
1202 _phase->set_ctrl(pk, _phase->get_ctrl(opd)); | |
1203 return pk; | |
1204 } | |
1205 | |
1206 //------------------------------insert_extracts--------------------------- | |
1207 // If a use of pack p is not a vector use, then replace the | |
1208 // use with an extract operation. | |
1209 void SuperWord::insert_extracts(Node_List* p) { | |
1210 if (p->at(0)->is_Store()) return; | |
1211 assert(_n_idx_list.is_empty(), "empty (node,index) list"); | |
1212 | |
1213 // Inspect each use of each pack member. For each use that is | |
1214 // not a vector use, replace the use with an extract operation. | |
1215 | |
1216 for (uint i = 0; i < p->size(); i++) { | |
1217 Node* def = p->at(i); | |
1218 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { | |
1219 Node* use = def->fast_out(j); | |
1220 for (uint k = 0; k < use->req(); k++) { | |
1221 Node* n = use->in(k); | |
1222 if (def == n) { | |
1223 if (!is_vector_use(use, k)) { | |
1224 _n_idx_list.push(use, k); | |
1225 } | |
1226 } | |
1227 } | |
1228 } | |
1229 } | |
1230 | |
1231 while (_n_idx_list.is_nonempty()) { | |
1232 Node* use = _n_idx_list.node(); | |
1233 int idx = _n_idx_list.index(); | |
1234 _n_idx_list.pop(); | |
1235 Node* def = use->in(idx); | |
1236 | |
1237 // Insert extract operation | |
1238 _igvn.hash_delete(def); | |
1239 _igvn.hash_delete(use); | |
1240 int def_pos = alignment(def) / data_size(def); | |
1241 const Type* def_t = velt_type(def); | |
1242 | |
1243 Node* ex = ExtractNode::make(_phase->C, def, def_pos, def_t); | |
1244 _phase->_igvn.register_new_node_with_optimizer(ex); | |
1245 _phase->set_ctrl(ex, _phase->get_ctrl(def)); | |
1246 use->set_req(idx, ex); | |
1247 _igvn._worklist.push(def); | |
1248 _igvn._worklist.push(use); | |
1249 | |
1250 bb_insert_after(ex, bb_idx(def)); | |
1251 set_velt_type(ex, def_t); | |
1252 } | |
1253 } | |
1254 | |
1255 //------------------------------is_vector_use--------------------------- | |
1256 // Is use->in(u_idx) a vector use? | |
1257 bool SuperWord::is_vector_use(Node* use, int u_idx) { | |
1258 Node_List* u_pk = my_pack(use); | |
1259 if (u_pk == NULL) return false; | |
1260 Node* def = use->in(u_idx); | |
1261 Node_List* d_pk = my_pack(def); | |
1262 if (d_pk == NULL) { | |
1263 // check for scalar promotion | |
1264 Node* n = u_pk->at(0)->in(u_idx); | |
1265 for (uint i = 1; i < u_pk->size(); i++) { | |
1266 if (u_pk->at(i)->in(u_idx) != n) return false; | |
1267 } | |
1268 return true; | |
1269 } | |
1270 if (u_pk->size() != d_pk->size()) | |
1271 return false; | |
1272 for (uint i = 0; i < u_pk->size(); i++) { | |
1273 Node* ui = u_pk->at(i); | |
1274 Node* di = d_pk->at(i); | |
1275 if (ui->in(u_idx) != di || alignment(ui) != alignment(di)) | |
1276 return false; | |
1277 } | |
1278 return true; | |
1279 } | |
1280 | |
1281 //------------------------------construct_bb--------------------------- | |
1282 // Construct reverse postorder list of block members | |
1283 void SuperWord::construct_bb() { | |
1284 Node* entry = bb(); | |
1285 | |
1286 assert(_stk.length() == 0, "stk is empty"); | |
1287 assert(_block.length() == 0, "block is empty"); | |
1288 assert(_data_entry.length() == 0, "data_entry is empty"); | |
1289 assert(_mem_slice_head.length() == 0, "mem_slice_head is empty"); | |
1290 assert(_mem_slice_tail.length() == 0, "mem_slice_tail is empty"); | |
1291 | |
1292 // Find non-control nodes with no inputs from within block, | |
1293 // create a temporary map from node _idx to bb_idx for use | |
1294 // by the visited and post_visited sets, | |
1295 // and count number of nodes in block. | |
1296 int bb_ct = 0; | |
1297 for (uint i = 0; i < lpt()->_body.size(); i++ ) { | |
1298 Node *n = lpt()->_body.at(i); | |
1299 set_bb_idx(n, i); // Create a temporary map | |
1300 if (in_bb(n)) { | |
1301 bb_ct++; | |
1302 if (!n->is_CFG()) { | |
1303 bool found = false; | |
1304 for (uint j = 0; j < n->req(); j++) { | |
1305 Node* def = n->in(j); | |
1306 if (def && in_bb(def)) { | |
1307 found = true; | |
1308 break; | |
1309 } | |
1310 } | |
1311 if (!found) { | |
1312 assert(n != entry, "can't be entry"); | |
1313 _data_entry.push(n); | |
1314 } | |
1315 } | |
1316 } | |
1317 } | |
1318 | |
1319 // Find memory slices (head and tail) | |
1320 for (DUIterator_Fast imax, i = lp()->fast_outs(imax); i < imax; i++) { | |
1321 Node *n = lp()->fast_out(i); | |
1322 if (in_bb(n) && (n->is_Phi() && n->bottom_type() == Type::MEMORY)) { | |
1323 Node* n_tail = n->in(LoopNode::LoopBackControl); | |
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1324 if (n_tail != n->in(LoopNode::EntryControl)) { |
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1325 _mem_slice_head.push(n); |
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1326 _mem_slice_tail.push(n_tail); |
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1327 } |
0 | 1328 } |
1329 } | |
1330 | |
1331 // Create an RPO list of nodes in block | |
1332 | |
1333 visited_clear(); | |
1334 post_visited_clear(); | |
1335 | |
1336 // Push all non-control nodes with no inputs from within block, then control entry | |
1337 for (int j = 0; j < _data_entry.length(); j++) { | |
1338 Node* n = _data_entry.at(j); | |
1339 visited_set(n); | |
1340 _stk.push(n); | |
1341 } | |
1342 visited_set(entry); | |
1343 _stk.push(entry); | |
1344 | |
1345 // Do a depth first walk over out edges | |
1346 int rpo_idx = bb_ct - 1; | |
1347 int size; | |
1348 while ((size = _stk.length()) > 0) { | |
1349 Node* n = _stk.top(); // Leave node on stack | |
1350 if (!visited_test_set(n)) { | |
1351 // forward arc in graph | |
1352 } else if (!post_visited_test(n)) { | |
1353 // cross or back arc | |
1354 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1355 Node *use = n->fast_out(i); | |
1356 if (in_bb(use) && !visited_test(use) && | |
1357 // Don't go around backedge | |
1358 (!use->is_Phi() || n == entry)) { | |
1359 _stk.push(use); | |
1360 } | |
1361 } | |
1362 if (_stk.length() == size) { | |
1363 // There were no additional uses, post visit node now | |
1364 _stk.pop(); // Remove node from stack | |
1365 assert(rpo_idx >= 0, ""); | |
1366 _block.at_put_grow(rpo_idx, n); | |
1367 rpo_idx--; | |
1368 post_visited_set(n); | |
1369 assert(rpo_idx >= 0 || _stk.is_empty(), ""); | |
1370 } | |
1371 } else { | |
1372 _stk.pop(); // Remove post-visited node from stack | |
1373 } | |
1374 } | |
1375 | |
1376 // Create real map of block indices for nodes | |
1377 for (int j = 0; j < _block.length(); j++) { | |
1378 Node* n = _block.at(j); | |
1379 set_bb_idx(n, j); | |
1380 } | |
1381 | |
1382 initialize_bb(); // Ensure extra info is allocated. | |
1383 | |
1384 #ifndef PRODUCT | |
1385 if (TraceSuperWord) { | |
1386 print_bb(); | |
1387 tty->print_cr("\ndata entry nodes: %s", _data_entry.length() > 0 ? "" : "NONE"); | |
1388 for (int m = 0; m < _data_entry.length(); m++) { | |
1389 tty->print("%3d ", m); | |
1390 _data_entry.at(m)->dump(); | |
1391 } | |
1392 tty->print_cr("\nmemory slices: %s", _mem_slice_head.length() > 0 ? "" : "NONE"); | |
1393 for (int m = 0; m < _mem_slice_head.length(); m++) { | |
1394 tty->print("%3d ", m); _mem_slice_head.at(m)->dump(); | |
1395 tty->print(" "); _mem_slice_tail.at(m)->dump(); | |
1396 } | |
1397 } | |
1398 #endif | |
1399 assert(rpo_idx == -1 && bb_ct == _block.length(), "all block members found"); | |
1400 } | |
1401 | |
1402 //------------------------------initialize_bb--------------------------- | |
1403 // Initialize per node info | |
1404 void SuperWord::initialize_bb() { | |
1405 Node* last = _block.at(_block.length() - 1); | |
1406 grow_node_info(bb_idx(last)); | |
1407 } | |
1408 | |
1409 //------------------------------bb_insert_after--------------------------- | |
1410 // Insert n into block after pos | |
1411 void SuperWord::bb_insert_after(Node* n, int pos) { | |
1412 int n_pos = pos + 1; | |
1413 // Make room | |
1414 for (int i = _block.length() - 1; i >= n_pos; i--) { | |
1415 _block.at_put_grow(i+1, _block.at(i)); | |
1416 } | |
1417 for (int j = _node_info.length() - 1; j >= n_pos; j--) { | |
1418 _node_info.at_put_grow(j+1, _node_info.at(j)); | |
1419 } | |
1420 // Set value | |
1421 _block.at_put_grow(n_pos, n); | |
1422 _node_info.at_put_grow(n_pos, SWNodeInfo::initial); | |
1423 // Adjust map from node->_idx to _block index | |
1424 for (int i = n_pos; i < _block.length(); i++) { | |
1425 set_bb_idx(_block.at(i), i); | |
1426 } | |
1427 } | |
1428 | |
1429 //------------------------------compute_max_depth--------------------------- | |
1430 // Compute max depth for expressions from beginning of block | |
1431 // Use to prune search paths during test for independence. | |
1432 void SuperWord::compute_max_depth() { | |
1433 int ct = 0; | |
1434 bool again; | |
1435 do { | |
1436 again = false; | |
1437 for (int i = 0; i < _block.length(); i++) { | |
1438 Node* n = _block.at(i); | |
1439 if (!n->is_Phi()) { | |
1440 int d_orig = depth(n); | |
1441 int d_in = 0; | |
1442 for (DepPreds preds(n, _dg); !preds.done(); preds.next()) { | |
1443 Node* pred = preds.current(); | |
1444 if (in_bb(pred)) { | |
1445 d_in = MAX2(d_in, depth(pred)); | |
1446 } | |
1447 } | |
1448 if (d_in + 1 != d_orig) { | |
1449 set_depth(n, d_in + 1); | |
1450 again = true; | |
1451 } | |
1452 } | |
1453 } | |
1454 ct++; | |
1455 } while (again); | |
1456 #ifndef PRODUCT | |
1457 if (TraceSuperWord && Verbose) | |
1458 tty->print_cr("compute_max_depth iterated: %d times", ct); | |
1459 #endif | |
1460 } | |
1461 | |
1462 //-------------------------compute_vector_element_type----------------------- | |
1463 // Compute necessary vector element type for expressions | |
1464 // This propagates backwards a narrower integer type when the | |
1465 // upper bits of the value are not needed. | |
1466 // Example: char a,b,c; a = b + c; | |
1467 // Normally the type of the add is integer, but for packed character | |
1468 // operations the type of the add needs to be char. | |
1469 void SuperWord::compute_vector_element_type() { | |
1470 #ifndef PRODUCT | |
1471 if (TraceSuperWord && Verbose) | |
1472 tty->print_cr("\ncompute_velt_type:"); | |
1473 #endif | |
1474 | |
1475 // Initial type | |
1476 for (int i = 0; i < _block.length(); i++) { | |
1477 Node* n = _block.at(i); | |
1478 const Type* t = n->is_Mem() ? Type::get_const_basic_type(n->as_Mem()->memory_type()) | |
1479 : _igvn.type(n); | |
1480 const Type* vt = container_type(t); | |
1481 set_velt_type(n, vt); | |
1482 } | |
1483 | |
1484 // Propagate narrowed type backwards through operations | |
1485 // that don't depend on higher order bits | |
1486 for (int i = _block.length() - 1; i >= 0; i--) { | |
1487 Node* n = _block.at(i); | |
1488 // Only integer types need be examined | |
1489 if (n->bottom_type()->isa_int()) { | |
1490 uint start, end; | |
1491 vector_opd_range(n, &start, &end); | |
1492 const Type* vt = velt_type(n); | |
1493 | |
1494 for (uint j = start; j < end; j++) { | |
1495 Node* in = n->in(j); | |
1496 // Don't propagate through a type conversion | |
1497 if (n->bottom_type() != in->bottom_type()) | |
1498 continue; | |
1499 switch(in->Opcode()) { | |
1500 case Op_AddI: case Op_AddL: | |
1501 case Op_SubI: case Op_SubL: | |
1502 case Op_MulI: case Op_MulL: | |
1503 case Op_AndI: case Op_AndL: | |
1504 case Op_OrI: case Op_OrL: | |
1505 case Op_XorI: case Op_XorL: | |
1506 case Op_LShiftI: case Op_LShiftL: | |
1507 case Op_CMoveI: case Op_CMoveL: | |
1508 if (in_bb(in)) { | |
1509 bool same_type = true; | |
1510 for (DUIterator_Fast kmax, k = in->fast_outs(kmax); k < kmax; k++) { | |
1511 Node *use = in->fast_out(k); | |
1512 if (!in_bb(use) || velt_type(use) != vt) { | |
1513 same_type = false; | |
1514 break; | |
1515 } | |
1516 } | |
1517 if (same_type) { | |
1518 set_velt_type(in, vt); | |
1519 } | |
1520 } | |
1521 } | |
1522 } | |
1523 } | |
1524 } | |
1525 #ifndef PRODUCT | |
1526 if (TraceSuperWord && Verbose) { | |
1527 for (int i = 0; i < _block.length(); i++) { | |
1528 Node* n = _block.at(i); | |
1529 velt_type(n)->dump(); | |
1530 tty->print("\t"); | |
1531 n->dump(); | |
1532 } | |
1533 } | |
1534 #endif | |
1535 } | |
1536 | |
1537 //------------------------------memory_alignment--------------------------- | |
1538 // Alignment within a vector memory reference | |
1539 int SuperWord::memory_alignment(MemNode* s, int iv_adjust_in_bytes) { | |
1540 SWPointer p(s, this); | |
1541 if (!p.valid()) { | |
1542 return bottom_align; | |
1543 } | |
1544 int offset = p.offset_in_bytes(); | |
1545 offset += iv_adjust_in_bytes; | |
1546 int off_rem = offset % vector_width_in_bytes(); | |
1547 int off_mod = off_rem >= 0 ? off_rem : off_rem + vector_width_in_bytes(); | |
1548 return off_mod; | |
1549 } | |
1550 | |
1551 //---------------------------container_type--------------------------- | |
1552 // Smallest type containing range of values | |
1553 const Type* SuperWord::container_type(const Type* t) { | |
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1554 const Type* tp = t->make_ptr(); |
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1555 if (tp && tp->isa_aryptr()) { |
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1556 t = tp->is_aryptr()->elem(); |
0 | 1557 } |
1558 if (t->basic_type() == T_INT) { | |
1559 if (t->higher_equal(TypeInt::BOOL)) return TypeInt::BOOL; | |
1560 if (t->higher_equal(TypeInt::BYTE)) return TypeInt::BYTE; | |
1561 if (t->higher_equal(TypeInt::CHAR)) return TypeInt::CHAR; | |
1562 if (t->higher_equal(TypeInt::SHORT)) return TypeInt::SHORT; | |
1563 return TypeInt::INT; | |
1564 } | |
1565 return t; | |
1566 } | |
1567 | |
1568 //-------------------------vector_opd_range----------------------- | |
1569 // (Start, end] half-open range defining which operands are vector | |
1570 void SuperWord::vector_opd_range(Node* n, uint* start, uint* end) { | |
1571 switch (n->Opcode()) { | |
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1572 case Op_LoadB: case Op_LoadUS: |
0 | 1573 case Op_LoadI: case Op_LoadL: |
1574 case Op_LoadF: case Op_LoadD: | |
1575 case Op_LoadP: | |
1576 *start = 0; | |
1577 *end = 0; | |
1578 return; | |
1579 case Op_StoreB: case Op_StoreC: | |
1580 case Op_StoreI: case Op_StoreL: | |
1581 case Op_StoreF: case Op_StoreD: | |
1582 case Op_StoreP: | |
1583 *start = MemNode::ValueIn; | |
1584 *end = *start + 1; | |
1585 return; | |
1586 case Op_LShiftI: case Op_LShiftL: | |
1587 *start = 1; | |
1588 *end = 2; | |
1589 return; | |
1590 case Op_CMoveI: case Op_CMoveL: case Op_CMoveF: case Op_CMoveD: | |
1591 *start = 2; | |
1592 *end = n->req(); | |
1593 return; | |
1594 } | |
1595 *start = 1; | |
1596 *end = n->req(); // default is all operands | |
1597 } | |
1598 | |
1599 //------------------------------in_packset--------------------------- | |
1600 // Are s1 and s2 in a pack pair and ordered as s1,s2? | |
1601 bool SuperWord::in_packset(Node* s1, Node* s2) { | |
1602 for (int i = 0; i < _packset.length(); i++) { | |
1603 Node_List* p = _packset.at(i); | |
1604 assert(p->size() == 2, "must be"); | |
1605 if (p->at(0) == s1 && p->at(p->size()-1) == s2) { | |
1606 return true; | |
1607 } | |
1608 } | |
1609 return false; | |
1610 } | |
1611 | |
1612 //------------------------------in_pack--------------------------- | |
1613 // Is s in pack p? | |
1614 Node_List* SuperWord::in_pack(Node* s, Node_List* p) { | |
1615 for (uint i = 0; i < p->size(); i++) { | |
1616 if (p->at(i) == s) { | |
1617 return p; | |
1618 } | |
1619 } | |
1620 return NULL; | |
1621 } | |
1622 | |
1623 //------------------------------remove_pack_at--------------------------- | |
1624 // Remove the pack at position pos in the packset | |
1625 void SuperWord::remove_pack_at(int pos) { | |
1626 Node_List* p = _packset.at(pos); | |
1627 for (uint i = 0; i < p->size(); i++) { | |
1628 Node* s = p->at(i); | |
1629 set_my_pack(s, NULL); | |
1630 } | |
1631 _packset.remove_at(pos); | |
1632 } | |
1633 | |
1634 //------------------------------executed_first--------------------------- | |
1635 // Return the node executed first in pack p. Uses the RPO block list | |
1636 // to determine order. | |
1637 Node* SuperWord::executed_first(Node_List* p) { | |
1638 Node* n = p->at(0); | |
1639 int n_rpo = bb_idx(n); | |
1640 for (uint i = 1; i < p->size(); i++) { | |
1641 Node* s = p->at(i); | |
1642 int s_rpo = bb_idx(s); | |
1643 if (s_rpo < n_rpo) { | |
1644 n = s; | |
1645 n_rpo = s_rpo; | |
1646 } | |
1647 } | |
1648 return n; | |
1649 } | |
1650 | |
1651 //------------------------------executed_last--------------------------- | |
1652 // Return the node executed last in pack p. | |
1653 Node* SuperWord::executed_last(Node_List* p) { | |
1654 Node* n = p->at(0); | |
1655 int n_rpo = bb_idx(n); | |
1656 for (uint i = 1; i < p->size(); i++) { | |
1657 Node* s = p->at(i); | |
1658 int s_rpo = bb_idx(s); | |
1659 if (s_rpo > n_rpo) { | |
1660 n = s; | |
1661 n_rpo = s_rpo; | |
1662 } | |
1663 } | |
1664 return n; | |
1665 } | |
1666 | |
1667 //----------------------------align_initial_loop_index--------------------------- | |
1668 // Adjust pre-loop limit so that in main loop, a load/store reference | |
1669 // to align_to_ref will be a position zero in the vector. | |
1670 // (iv + k) mod vector_align == 0 | |
1671 void SuperWord::align_initial_loop_index(MemNode* align_to_ref) { | |
1672 CountedLoopNode *main_head = lp()->as_CountedLoop(); | |
1673 assert(main_head->is_main_loop(), ""); | |
1674 CountedLoopEndNode* pre_end = get_pre_loop_end(main_head); | |
1675 assert(pre_end != NULL, ""); | |
1676 Node *pre_opaq1 = pre_end->limit(); | |
1677 assert(pre_opaq1->Opcode() == Op_Opaque1, ""); | |
1678 Opaque1Node *pre_opaq = (Opaque1Node*)pre_opaq1; | |
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1679 Node *lim0 = pre_opaq->in(1); |
0 | 1680 |
1681 // Where we put new limit calculations | |
1682 Node *pre_ctrl = pre_end->loopnode()->in(LoopNode::EntryControl); | |
1683 | |
1684 // Ensure the original loop limit is available from the | |
1685 // pre-loop Opaque1 node. | |
1686 Node *orig_limit = pre_opaq->original_loop_limit(); | |
1687 assert(orig_limit != NULL && _igvn.type(orig_limit) != Type::TOP, ""); | |
1688 | |
1689 SWPointer align_to_ref_p(align_to_ref, this); | |
1690 | |
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1691 // Given: |
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1692 // lim0 == original pre loop limit |
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1693 // V == v_align (power of 2) |
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1694 // invar == extra invariant piece of the address expression |
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1695 // e == k [ +/- invar ] |
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1696 // |
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1697 // When reassociating expressions involving '%' the basic rules are: |
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1698 // (a - b) % k == 0 => a % k == b % k |
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1699 // and: |
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1700 // (a + b) % k == 0 => a % k == (k - b) % k |
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1701 // |
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1702 // For stride > 0 && scale > 0, |
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1703 // Derive the new pre-loop limit "lim" such that the two constraints: |
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1704 // (1) lim = lim0 + N (where N is some positive integer < V) |
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1705 // (2) (e + lim) % V == 0 |
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1706 // are true. |
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1707 // |
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1708 // Substituting (1) into (2), |
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1709 // (e + lim0 + N) % V == 0 |
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1710 // solve for N: |
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1711 // N = (V - (e + lim0)) % V |
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1712 // substitute back into (1), so that new limit |
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1713 // lim = lim0 + (V - (e + lim0)) % V |
0 | 1714 // |
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1715 // For stride > 0 && scale < 0 |
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1716 // Constraints: |
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1717 // lim = lim0 + N |
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1718 // (e - lim) % V == 0 |
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1719 // Solving for lim: |
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1720 // (e - lim0 - N) % V == 0 |
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1721 // N = (e - lim0) % V |
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1722 // lim = lim0 + (e - lim0) % V |
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1723 // |
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1724 // For stride < 0 && scale > 0 |
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1725 // Constraints: |
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1726 // lim = lim0 - N |
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1727 // (e + lim) % V == 0 |
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1728 // Solving for lim: |
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1729 // (e + lim0 - N) % V == 0 |
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1730 // N = (e + lim0) % V |
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1731 // lim = lim0 - (e + lim0) % V |
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1732 // |
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1733 // For stride < 0 && scale < 0 |
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1734 // Constraints: |
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1735 // lim = lim0 - N |
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1736 // (e - lim) % V == 0 |
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1737 // Solving for lim: |
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1738 // (e - lim0 + N) % V == 0 |
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1739 // N = (V - (e - lim0)) % V |
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1740 // lim = lim0 - (V - (e - lim0)) % V |
0 | 1741 |
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1742 int stride = iv_stride(); |
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1743 int scale = align_to_ref_p.scale_in_bytes(); |
0 | 1744 int elt_size = align_to_ref_p.memory_size(); |
1745 int v_align = vector_width_in_bytes() / elt_size; | |
1746 int k = align_to_ref_p.offset_in_bytes() / elt_size; | |
1747 | |
1748 Node *kn = _igvn.intcon(k); | |
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1749 |
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1750 Node *e = kn; |
0 | 1751 if (align_to_ref_p.invar() != NULL) { |
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1752 // incorporate any extra invariant piece producing k +/- invar >>> log2(elt) |
0 | 1753 Node* log2_elt = _igvn.intcon(exact_log2(elt_size)); |
1754 Node* aref = new (_phase->C, 3) URShiftINode(align_to_ref_p.invar(), log2_elt); | |
1755 _phase->_igvn.register_new_node_with_optimizer(aref); | |
1756 _phase->set_ctrl(aref, pre_ctrl); | |
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1757 if (align_to_ref_p.negate_invar()) { |
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1758 e = new (_phase->C, 3) SubINode(e, aref); |
0 | 1759 } else { |
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1760 e = new (_phase->C, 3) AddINode(e, aref); |
0 | 1761 } |
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1762 _phase->_igvn.register_new_node_with_optimizer(e); |
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1763 _phase->set_ctrl(e, pre_ctrl); |
0 | 1764 } |
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1765 |
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1766 // compute e +/- lim0 |
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1767 if (scale < 0) { |
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1768 e = new (_phase->C, 3) SubINode(e, lim0); |
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1769 } else { |
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1770 e = new (_phase->C, 3) AddINode(e, lim0); |
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1771 } |
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1772 _phase->_igvn.register_new_node_with_optimizer(e); |
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1773 _phase->set_ctrl(e, pre_ctrl); |
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1774 |
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1775 if (stride * scale > 0) { |
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1776 // compute V - (e +/- lim0) |
0 | 1777 Node* va = _igvn.intcon(v_align); |
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1778 e = new (_phase->C, 3) SubINode(va, e); |
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1779 _phase->_igvn.register_new_node_with_optimizer(e); |
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1780 _phase->set_ctrl(e, pre_ctrl); |
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1781 } |
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1782 // compute N = (exp) % V |
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1783 Node* va_msk = _igvn.intcon(v_align - 1); |
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1784 Node* N = new (_phase->C, 3) AndINode(e, va_msk); |
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1785 _phase->_igvn.register_new_node_with_optimizer(N); |
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1786 _phase->set_ctrl(N, pre_ctrl); |
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1787 |
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1788 // substitute back into (1), so that new limit |
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1789 // lim = lim0 + N |
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1790 Node* lim; |
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1791 if (stride < 0) { |
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1792 lim = new (_phase->C, 3) SubINode(lim0, N); |
0 | 1793 } else { |
72
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1794 lim = new (_phase->C, 3) AddINode(lim0, N); |
0 | 1795 } |
72
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1796 _phase->_igvn.register_new_node_with_optimizer(lim); |
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1797 _phase->set_ctrl(lim, pre_ctrl); |
0 | 1798 Node* constrained = |
72
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1799 (stride > 0) ? (Node*) new (_phase->C,3) MinINode(lim, orig_limit) |
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1800 : (Node*) new (_phase->C,3) MaxINode(lim, orig_limit); |
0 | 1801 _phase->_igvn.register_new_node_with_optimizer(constrained); |
1802 _phase->set_ctrl(constrained, pre_ctrl); | |
1803 _igvn.hash_delete(pre_opaq); | |
1804 pre_opaq->set_req(1, constrained); | |
1805 } | |
1806 | |
1807 //----------------------------get_pre_loop_end--------------------------- | |
1808 // Find pre loop end from main loop. Returns null if none. | |
1809 CountedLoopEndNode* SuperWord::get_pre_loop_end(CountedLoopNode *cl) { | |
1810 Node *ctrl = cl->in(LoopNode::EntryControl); | |
1811 if (!ctrl->is_IfTrue() && !ctrl->is_IfFalse()) return NULL; | |
1812 Node *iffm = ctrl->in(0); | |
1813 if (!iffm->is_If()) return NULL; | |
1814 Node *p_f = iffm->in(0); | |
1815 if (!p_f->is_IfFalse()) return NULL; | |
1816 if (!p_f->in(0)->is_CountedLoopEnd()) return NULL; | |
1817 CountedLoopEndNode *pre_end = p_f->in(0)->as_CountedLoopEnd(); | |
1818 if (!pre_end->loopnode()->is_pre_loop()) return NULL; | |
1819 return pre_end; | |
1820 } | |
1821 | |
1822 | |
1823 //------------------------------init--------------------------- | |
1824 void SuperWord::init() { | |
1825 _dg.init(); | |
1826 _packset.clear(); | |
1827 _disjoint_ptrs.clear(); | |
1828 _block.clear(); | |
1829 _data_entry.clear(); | |
1830 _mem_slice_head.clear(); | |
1831 _mem_slice_tail.clear(); | |
1832 _node_info.clear(); | |
1833 _align_to_ref = NULL; | |
1834 _lpt = NULL; | |
1835 _lp = NULL; | |
1836 _bb = NULL; | |
1837 _iv = NULL; | |
1838 } | |
1839 | |
1840 //------------------------------print_packset--------------------------- | |
1841 void SuperWord::print_packset() { | |
1842 #ifndef PRODUCT | |
1843 tty->print_cr("packset"); | |
1844 for (int i = 0; i < _packset.length(); i++) { | |
1845 tty->print_cr("Pack: %d", i); | |
1846 Node_List* p = _packset.at(i); | |
1847 print_pack(p); | |
1848 } | |
1849 #endif | |
1850 } | |
1851 | |
1852 //------------------------------print_pack--------------------------- | |
1853 void SuperWord::print_pack(Node_List* p) { | |
1854 for (uint i = 0; i < p->size(); i++) { | |
1855 print_stmt(p->at(i)); | |
1856 } | |
1857 } | |
1858 | |
1859 //------------------------------print_bb--------------------------- | |
1860 void SuperWord::print_bb() { | |
1861 #ifndef PRODUCT | |
1862 tty->print_cr("\nBlock"); | |
1863 for (int i = 0; i < _block.length(); i++) { | |
1864 Node* n = _block.at(i); | |
1865 tty->print("%d ", i); | |
1866 if (n) { | |
1867 n->dump(); | |
1868 } | |
1869 } | |
1870 #endif | |
1871 } | |
1872 | |
1873 //------------------------------print_stmt--------------------------- | |
1874 void SuperWord::print_stmt(Node* s) { | |
1875 #ifndef PRODUCT | |
1876 tty->print(" align: %d \t", alignment(s)); | |
1877 s->dump(); | |
1878 #endif | |
1879 } | |
1880 | |
1881 //------------------------------blank--------------------------- | |
1882 char* SuperWord::blank(uint depth) { | |
1883 static char blanks[101]; | |
1884 assert(depth < 101, "too deep"); | |
1885 for (uint i = 0; i < depth; i++) blanks[i] = ' '; | |
1886 blanks[depth] = '\0'; | |
1887 return blanks; | |
1888 } | |
1889 | |
1890 | |
1891 //==============================SWPointer=========================== | |
1892 | |
1893 //----------------------------SWPointer------------------------ | |
1894 SWPointer::SWPointer(MemNode* mem, SuperWord* slp) : | |
1895 _mem(mem), _slp(slp), _base(NULL), _adr(NULL), | |
1896 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) { | |
1897 | |
1898 Node* adr = mem->in(MemNode::Address); | |
1899 if (!adr->is_AddP()) { | |
1900 assert(!valid(), "too complex"); | |
1901 return; | |
1902 } | |
1903 // Match AddP(base, AddP(ptr, k*iv [+ invariant]), constant) | |
1904 Node* base = adr->in(AddPNode::Base); | |
1905 for (int i = 0; i < 3; i++) { | |
1906 if (!scaled_iv_plus_offset(adr->in(AddPNode::Offset))) { | |
1907 assert(!valid(), "too complex"); | |
1908 return; | |
1909 } | |
1910 adr = adr->in(AddPNode::Address); | |
1911 if (base == adr || !adr->is_AddP()) { | |
1912 break; // stop looking at addp's | |
1913 } | |
1914 } | |
1915 _base = base; | |
1916 _adr = adr; | |
1917 assert(valid(), "Usable"); | |
1918 } | |
1919 | |
1920 // Following is used to create a temporary object during | |
1921 // the pattern match of an address expression. | |
1922 SWPointer::SWPointer(SWPointer* p) : | |
1923 _mem(p->_mem), _slp(p->_slp), _base(NULL), _adr(NULL), | |
1924 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) {} | |
1925 | |
1926 //------------------------scaled_iv_plus_offset-------------------- | |
1927 // Match: k*iv + offset | |
1928 // where: k is a constant that maybe zero, and | |
1929 // offset is (k2 [+/- invariant]) where k2 maybe zero and invariant is optional | |
1930 bool SWPointer::scaled_iv_plus_offset(Node* n) { | |
1931 if (scaled_iv(n)) { | |
1932 return true; | |
1933 } | |
1934 if (offset_plus_k(n)) { | |
1935 return true; | |
1936 } | |
1937 int opc = n->Opcode(); | |
1938 if (opc == Op_AddI) { | |
1939 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2))) { | |
1940 return true; | |
1941 } | |
1942 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { | |
1943 return true; | |
1944 } | |
1945 } else if (opc == Op_SubI) { | |
1946 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2), true)) { | |
1947 return true; | |
1948 } | |
1949 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { | |
1950 _scale *= -1; | |
1951 return true; | |
1952 } | |
1953 } | |
1954 return false; | |
1955 } | |
1956 | |
1957 //----------------------------scaled_iv------------------------ | |
1958 // Match: k*iv where k is a constant that's not zero | |
1959 bool SWPointer::scaled_iv(Node* n) { | |
1960 if (_scale != 0) { | |
1961 return false; // already found a scale | |
1962 } | |
1963 if (n == iv()) { | |
1964 _scale = 1; | |
1965 return true; | |
1966 } | |
1967 int opc = n->Opcode(); | |
1968 if (opc == Op_MulI) { | |
1969 if (n->in(1) == iv() && n->in(2)->is_Con()) { | |
1970 _scale = n->in(2)->get_int(); | |
1971 return true; | |
1972 } else if (n->in(2) == iv() && n->in(1)->is_Con()) { | |
1973 _scale = n->in(1)->get_int(); | |
1974 return true; | |
1975 } | |
1976 } else if (opc == Op_LShiftI) { | |
1977 if (n->in(1) == iv() && n->in(2)->is_Con()) { | |
1978 _scale = 1 << n->in(2)->get_int(); | |
1979 return true; | |
1980 } | |
1981 } else if (opc == Op_ConvI2L) { | |
1982 if (scaled_iv_plus_offset(n->in(1))) { | |
1983 return true; | |
1984 } | |
1985 } else if (opc == Op_LShiftL) { | |
1986 if (!has_iv() && _invar == NULL) { | |
1987 // Need to preserve the current _offset value, so | |
1988 // create a temporary object for this expression subtree. | |
1989 // Hacky, so should re-engineer the address pattern match. | |
1990 SWPointer tmp(this); | |
1991 if (tmp.scaled_iv_plus_offset(n->in(1))) { | |
1992 if (tmp._invar == NULL) { | |
1993 int mult = 1 << n->in(2)->get_int(); | |
1994 _scale = tmp._scale * mult; | |
1995 _offset += tmp._offset * mult; | |
1996 return true; | |
1997 } | |
1998 } | |
1999 } | |
2000 } | |
2001 return false; | |
2002 } | |
2003 | |
2004 //----------------------------offset_plus_k------------------------ | |
2005 // Match: offset is (k [+/- invariant]) | |
2006 // where k maybe zero and invariant is optional, but not both. | |
2007 bool SWPointer::offset_plus_k(Node* n, bool negate) { | |
2008 int opc = n->Opcode(); | |
2009 if (opc == Op_ConI) { | |
2010 _offset += negate ? -(n->get_int()) : n->get_int(); | |
2011 return true; | |
2012 } else if (opc == Op_ConL) { | |
2013 // Okay if value fits into an int | |
2014 const TypeLong* t = n->find_long_type(); | |
2015 if (t->higher_equal(TypeLong::INT)) { | |
2016 jlong loff = n->get_long(); | |
2017 jint off = (jint)loff; | |
2018 _offset += negate ? -off : loff; | |
2019 return true; | |
2020 } | |
2021 return false; | |
2022 } | |
2023 if (_invar != NULL) return false; // already have an invariant | |
2024 if (opc == Op_AddI) { | |
2025 if (n->in(2)->is_Con() && invariant(n->in(1))) { | |
2026 _negate_invar = negate; | |
2027 _invar = n->in(1); | |
2028 _offset += negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); | |
2029 return true; | |
2030 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { | |
2031 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); | |
2032 _negate_invar = negate; | |
2033 _invar = n->in(2); | |
2034 return true; | |
2035 } | |
2036 } | |
2037 if (opc == Op_SubI) { | |
2038 if (n->in(2)->is_Con() && invariant(n->in(1))) { | |
2039 _negate_invar = negate; | |
2040 _invar = n->in(1); | |
2041 _offset += !negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); | |
2042 return true; | |
2043 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { | |
2044 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); | |
2045 _negate_invar = !negate; | |
2046 _invar = n->in(2); | |
2047 return true; | |
2048 } | |
2049 } | |
2050 if (invariant(n)) { | |
2051 _negate_invar = negate; | |
2052 _invar = n; | |
2053 return true; | |
2054 } | |
2055 return false; | |
2056 } | |
2057 | |
2058 //----------------------------print------------------------ | |
2059 void SWPointer::print() { | |
2060 #ifndef PRODUCT | |
2061 tty->print("base: %d adr: %d scale: %d offset: %d invar: %c%d\n", | |
2062 _base != NULL ? _base->_idx : 0, | |
2063 _adr != NULL ? _adr->_idx : 0, | |
2064 _scale, _offset, | |
2065 _negate_invar?'-':'+', | |
2066 _invar != NULL ? _invar->_idx : 0); | |
2067 #endif | |
2068 } | |
2069 | |
2070 // ========================= OrderedPair ===================== | |
2071 | |
2072 const OrderedPair OrderedPair::initial; | |
2073 | |
2074 // ========================= SWNodeInfo ===================== | |
2075 | |
2076 const SWNodeInfo SWNodeInfo::initial; | |
2077 | |
2078 | |
2079 // ============================ DepGraph =========================== | |
2080 | |
2081 //------------------------------make_node--------------------------- | |
2082 // Make a new dependence graph node for an ideal node. | |
2083 DepMem* DepGraph::make_node(Node* node) { | |
2084 DepMem* m = new (_arena) DepMem(node); | |
2085 if (node != NULL) { | |
2086 assert(_map.at_grow(node->_idx) == NULL, "one init only"); | |
2087 _map.at_put_grow(node->_idx, m); | |
2088 } | |
2089 return m; | |
2090 } | |
2091 | |
2092 //------------------------------make_edge--------------------------- | |
2093 // Make a new dependence graph edge from dpred -> dsucc | |
2094 DepEdge* DepGraph::make_edge(DepMem* dpred, DepMem* dsucc) { | |
2095 DepEdge* e = new (_arena) DepEdge(dpred, dsucc, dsucc->in_head(), dpred->out_head()); | |
2096 dpred->set_out_head(e); | |
2097 dsucc->set_in_head(e); | |
2098 return e; | |
2099 } | |
2100 | |
2101 // ========================== DepMem ======================== | |
2102 | |
2103 //------------------------------in_cnt--------------------------- | |
2104 int DepMem::in_cnt() { | |
2105 int ct = 0; | |
2106 for (DepEdge* e = _in_head; e != NULL; e = e->next_in()) ct++; | |
2107 return ct; | |
2108 } | |
2109 | |
2110 //------------------------------out_cnt--------------------------- | |
2111 int DepMem::out_cnt() { | |
2112 int ct = 0; | |
2113 for (DepEdge* e = _out_head; e != NULL; e = e->next_out()) ct++; | |
2114 return ct; | |
2115 } | |
2116 | |
2117 //------------------------------print----------------------------- | |
2118 void DepMem::print() { | |
2119 #ifndef PRODUCT | |
2120 tty->print(" DepNode %d (", _node->_idx); | |
2121 for (DepEdge* p = _in_head; p != NULL; p = p->next_in()) { | |
2122 Node* pred = p->pred()->node(); | |
2123 tty->print(" %d", pred != NULL ? pred->_idx : 0); | |
2124 } | |
2125 tty->print(") ["); | |
2126 for (DepEdge* s = _out_head; s != NULL; s = s->next_out()) { | |
2127 Node* succ = s->succ()->node(); | |
2128 tty->print(" %d", succ != NULL ? succ->_idx : 0); | |
2129 } | |
2130 tty->print_cr(" ]"); | |
2131 #endif | |
2132 } | |
2133 | |
2134 // =========================== DepEdge ========================= | |
2135 | |
2136 //------------------------------DepPreds--------------------------- | |
2137 void DepEdge::print() { | |
2138 #ifndef PRODUCT | |
2139 tty->print_cr("DepEdge: %d [ %d ]", _pred->node()->_idx, _succ->node()->_idx); | |
2140 #endif | |
2141 } | |
2142 | |
2143 // =========================== DepPreds ========================= | |
2144 // Iterator over predecessor edges in the dependence graph. | |
2145 | |
2146 //------------------------------DepPreds--------------------------- | |
2147 DepPreds::DepPreds(Node* n, DepGraph& dg) { | |
2148 _n = n; | |
2149 _done = false; | |
2150 if (_n->is_Store() || _n->is_Load()) { | |
2151 _next_idx = MemNode::Address; | |
2152 _end_idx = n->req(); | |
2153 _dep_next = dg.dep(_n)->in_head(); | |
2154 } else if (_n->is_Mem()) { | |
2155 _next_idx = 0; | |
2156 _end_idx = 0; | |
2157 _dep_next = dg.dep(_n)->in_head(); | |
2158 } else { | |
2159 _next_idx = 1; | |
2160 _end_idx = _n->req(); | |
2161 _dep_next = NULL; | |
2162 } | |
2163 next(); | |
2164 } | |
2165 | |
2166 //------------------------------next--------------------------- | |
2167 void DepPreds::next() { | |
2168 if (_dep_next != NULL) { | |
2169 _current = _dep_next->pred()->node(); | |
2170 _dep_next = _dep_next->next_in(); | |
2171 } else if (_next_idx < _end_idx) { | |
2172 _current = _n->in(_next_idx++); | |
2173 } else { | |
2174 _done = true; | |
2175 } | |
2176 } | |
2177 | |
2178 // =========================== DepSuccs ========================= | |
2179 // Iterator over successor edges in the dependence graph. | |
2180 | |
2181 //------------------------------DepSuccs--------------------------- | |
2182 DepSuccs::DepSuccs(Node* n, DepGraph& dg) { | |
2183 _n = n; | |
2184 _done = false; | |
2185 if (_n->is_Load()) { | |
2186 _next_idx = 0; | |
2187 _end_idx = _n->outcnt(); | |
2188 _dep_next = dg.dep(_n)->out_head(); | |
2189 } else if (_n->is_Mem() || _n->is_Phi() && _n->bottom_type() == Type::MEMORY) { | |
2190 _next_idx = 0; | |
2191 _end_idx = 0; | |
2192 _dep_next = dg.dep(_n)->out_head(); | |
2193 } else { | |
2194 _next_idx = 0; | |
2195 _end_idx = _n->outcnt(); | |
2196 _dep_next = NULL; | |
2197 } | |
2198 next(); | |
2199 } | |
2200 | |
2201 //-------------------------------next--------------------------- | |
2202 void DepSuccs::next() { | |
2203 if (_dep_next != NULL) { | |
2204 _current = _dep_next->succ()->node(); | |
2205 _dep_next = _dep_next->next_out(); | |
2206 } else if (_next_idx < _end_idx) { | |
2207 _current = _n->raw_out(_next_idx++); | |
2208 } else { | |
2209 _done = true; | |
2210 } | |
2211 } |