Mercurial > hg > graal-compiler
annotate src/share/vm/opto/superword.cpp @ 99:8a4ef4e001d3
6680594: Load + Load isn't canonicalized leading to missed GVN opportunities
Reviewed-by: kvn, jrose
author | never |
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date | Fri, 28 Mar 2008 09:00:39 -0700 |
parents | f705f25597eb |
children | a7d0f95410bd |
rev | line source |
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0 | 1 /* |
2 * Copyright 2007 Sun Microsystems, Inc. All Rights Reserved. | |
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 | |
68 // Check for pre-loop ending with CountedLoopEnd(Bool(Cmp(x,Opaque1(limit)))) | |
69 CountedLoopEndNode* pre_end = get_pre_loop_end(cl); | |
70 if (pre_end == NULL) return; | |
71 Node *pre_opaq1 = pre_end->limit(); | |
72 if (pre_opaq1->Opcode() != Op_Opaque1) return; | |
73 | |
74 // Do vectors exist on this architecture? | |
75 if (vector_width_in_bytes() == 0) return; | |
76 | |
77 init(); // initialize data structures | |
78 | |
79 set_lpt(lpt); | |
80 set_lp(cl); | |
81 | |
82 // For now, define one block which is the entire loop body | |
83 set_bb(cl); | |
84 | |
85 assert(_packset.length() == 0, "packset must be empty"); | |
86 SLP_extract(); | |
87 } | |
88 | |
89 //------------------------------SLP_extract--------------------------- | |
90 // Extract the superword level parallelism | |
91 // | |
92 // 1) A reverse post-order of nodes in the block is constructed. By scanning | |
93 // this list from first to last, all definitions are visited before their uses. | |
94 // | |
95 // 2) A point-to-point dependence graph is constructed between memory references. | |
96 // This simplies the upcoming "independence" checker. | |
97 // | |
98 // 3) The maximum depth in the node graph from the beginning of the block | |
99 // to each node is computed. This is used to prune the graph search | |
100 // in the independence checker. | |
101 // | |
102 // 4) For integer types, the necessary bit width is propagated backwards | |
103 // from stores to allow packed operations on byte, char, and short | |
104 // integers. This reverses the promotion to type "int" that javac | |
105 // did for operations like: char c1,c2,c3; c1 = c2 + c3. | |
106 // | |
107 // 5) One of the memory references is picked to be an aligned vector reference. | |
108 // The pre-loop trip count is adjusted to align this reference in the | |
109 // unrolled body. | |
110 // | |
111 // 6) The initial set of pack pairs is seeded with memory references. | |
112 // | |
113 // 7) The set of pack pairs is extended by following use->def and def->use links. | |
114 // | |
115 // 8) The pairs are combined into vector sized packs. | |
116 // | |
117 // 9) Reorder the memory slices to co-locate members of the memory packs. | |
118 // | |
119 // 10) Generate ideal vector nodes for the final set of packs and where necessary, | |
120 // inserting scalar promotion, vector creation from multiple scalars, and | |
121 // extraction of scalar values from vectors. | |
122 // | |
123 void SuperWord::SLP_extract() { | |
124 | |
125 // Ready the block | |
126 | |
127 construct_bb(); | |
128 | |
129 dependence_graph(); | |
130 | |
131 compute_max_depth(); | |
132 | |
133 compute_vector_element_type(); | |
134 | |
135 // Attempt vectorization | |
136 | |
137 find_adjacent_refs(); | |
138 | |
139 extend_packlist(); | |
140 | |
141 combine_packs(); | |
142 | |
143 construct_my_pack_map(); | |
144 | |
145 filter_packs(); | |
146 | |
147 schedule(); | |
148 | |
149 output(); | |
150 } | |
151 | |
152 //------------------------------find_adjacent_refs--------------------------- | |
153 // Find the adjacent memory references and create pack pairs for them. | |
154 // This is the initial set of packs that will then be extended by | |
155 // following use->def and def->use links. The align positions are | |
156 // assigned relative to the reference "align_to_ref" | |
157 void SuperWord::find_adjacent_refs() { | |
158 // Get list of memory operations | |
159 Node_List memops; | |
160 for (int i = 0; i < _block.length(); i++) { | |
161 Node* n = _block.at(i); | |
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162 if (n->is_Mem() && in_bb(n) && |
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163 is_java_primitive(n->as_Mem()->memory_type())) { |
0 | 164 int align = memory_alignment(n->as_Mem(), 0); |
165 if (align != bottom_align) { | |
166 memops.push(n); | |
167 } | |
168 } | |
169 } | |
170 if (memops.size() == 0) return; | |
171 | |
172 // Find a memory reference to align to. The pre-loop trip count | |
173 // is modified to align this reference to a vector-aligned address | |
174 find_align_to_ref(memops); | |
175 if (align_to_ref() == NULL) return; | |
176 | |
177 SWPointer align_to_ref_p(align_to_ref(), this); | |
178 int offset = align_to_ref_p.offset_in_bytes(); | |
179 int scale = align_to_ref_p.scale_in_bytes(); | |
180 int vw = vector_width_in_bytes(); | |
181 int stride_sign = (scale * iv_stride()) > 0 ? 1 : -1; | |
182 int iv_adjustment = (stride_sign * vw - (offset % vw)) % vw; | |
183 | |
184 #ifndef PRODUCT | |
185 if (TraceSuperWord) | |
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186 tty->print_cr("\noffset = %d iv_adjustment = %d elt_align = %d scale = %d iv_stride = %d", |
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187 offset, iv_adjustment, align_to_ref_p.memory_size(), align_to_ref_p.scale_in_bytes(), iv_stride()); |
0 | 188 #endif |
189 | |
190 // Set alignment relative to "align_to_ref" | |
191 for (int i = memops.size() - 1; i >= 0; i--) { | |
192 MemNode* s = memops.at(i)->as_Mem(); | |
193 SWPointer p2(s, this); | |
194 if (p2.comparable(align_to_ref_p)) { | |
195 int align = memory_alignment(s, iv_adjustment); | |
196 set_alignment(s, align); | |
197 } else { | |
198 memops.remove(i); | |
199 } | |
200 } | |
201 | |
202 // Create initial pack pairs of memory operations | |
203 for (uint i = 0; i < memops.size(); i++) { | |
204 Node* s1 = memops.at(i); | |
205 for (uint j = 0; j < memops.size(); j++) { | |
206 Node* s2 = memops.at(j); | |
207 if (s1 != s2 && are_adjacent_refs(s1, s2)) { | |
208 int align = alignment(s1); | |
209 if (stmts_can_pack(s1, s2, align)) { | |
210 Node_List* pair = new Node_List(); | |
211 pair->push(s1); | |
212 pair->push(s2); | |
213 _packset.append(pair); | |
214 } | |
215 } | |
216 } | |
217 } | |
218 | |
219 #ifndef PRODUCT | |
220 if (TraceSuperWord) { | |
221 tty->print_cr("\nAfter find_adjacent_refs"); | |
222 print_packset(); | |
223 } | |
224 #endif | |
225 } | |
226 | |
227 //------------------------------find_align_to_ref--------------------------- | |
228 // Find a memory reference to align the loop induction variable to. | |
229 // Looks first at stores then at loads, looking for a memory reference | |
230 // with the largest number of references similar to it. | |
231 void SuperWord::find_align_to_ref(Node_List &memops) { | |
232 GrowableArray<int> cmp_ct(arena(), memops.size(), memops.size(), 0); | |
233 | |
234 // Count number of comparable memory ops | |
235 for (uint i = 0; i < memops.size(); i++) { | |
236 MemNode* s1 = memops.at(i)->as_Mem(); | |
237 SWPointer p1(s1, this); | |
238 // Discard if pre loop can't align this reference | |
239 if (!ref_is_alignable(p1)) { | |
240 *cmp_ct.adr_at(i) = 0; | |
241 continue; | |
242 } | |
243 for (uint j = i+1; j < memops.size(); j++) { | |
244 MemNode* s2 = memops.at(j)->as_Mem(); | |
245 if (isomorphic(s1, s2)) { | |
246 SWPointer p2(s2, this); | |
247 if (p1.comparable(p2)) { | |
248 (*cmp_ct.adr_at(i))++; | |
249 (*cmp_ct.adr_at(j))++; | |
250 } | |
251 } | |
252 } | |
253 } | |
254 | |
255 // Find Store (or Load) with the greatest number of "comparable" references | |
256 int max_ct = 0; | |
257 int max_idx = -1; | |
258 int min_size = max_jint; | |
259 int min_iv_offset = max_jint; | |
260 for (uint j = 0; j < memops.size(); j++) { | |
261 MemNode* s = memops.at(j)->as_Mem(); | |
262 if (s->is_Store()) { | |
263 SWPointer p(s, this); | |
264 if (cmp_ct.at(j) > max_ct || | |
265 cmp_ct.at(j) == max_ct && (data_size(s) < min_size || | |
266 data_size(s) == min_size && | |
267 p.offset_in_bytes() < min_iv_offset)) { | |
268 max_ct = cmp_ct.at(j); | |
269 max_idx = j; | |
270 min_size = data_size(s); | |
271 min_iv_offset = p.offset_in_bytes(); | |
272 } | |
273 } | |
274 } | |
275 // If no stores, look at loads | |
276 if (max_ct == 0) { | |
277 for (uint j = 0; j < memops.size(); j++) { | |
278 MemNode* s = memops.at(j)->as_Mem(); | |
279 if (s->is_Load()) { | |
280 SWPointer p(s, this); | |
281 if (cmp_ct.at(j) > max_ct || | |
282 cmp_ct.at(j) == max_ct && (data_size(s) < min_size || | |
283 data_size(s) == min_size && | |
284 p.offset_in_bytes() < min_iv_offset)) { | |
285 max_ct = cmp_ct.at(j); | |
286 max_idx = j; | |
287 min_size = data_size(s); | |
288 min_iv_offset = p.offset_in_bytes(); | |
289 } | |
290 } | |
291 } | |
292 } | |
293 | |
294 if (max_ct > 0) | |
295 set_align_to_ref(memops.at(max_idx)->as_Mem()); | |
296 | |
297 #ifndef PRODUCT | |
298 if (TraceSuperWord && Verbose) { | |
299 tty->print_cr("\nVector memops after find_align_to_refs"); | |
300 for (uint i = 0; i < memops.size(); i++) { | |
301 MemNode* s = memops.at(i)->as_Mem(); | |
302 s->dump(); | |
303 } | |
304 } | |
305 #endif | |
306 } | |
307 | |
308 //------------------------------ref_is_alignable--------------------------- | |
309 // Can the preloop align the reference to position zero in the vector? | |
310 bool SuperWord::ref_is_alignable(SWPointer& p) { | |
311 if (!p.has_iv()) { | |
312 return true; // no induction variable | |
313 } | |
314 CountedLoopEndNode* pre_end = get_pre_loop_end(lp()->as_CountedLoop()); | |
315 assert(pre_end->stride_is_con(), "pre loop stride is constant"); | |
316 int preloop_stride = pre_end->stride_con(); | |
317 | |
318 int span = preloop_stride * p.scale_in_bytes(); | |
319 | |
320 // Stride one accesses are alignable. | |
321 if (ABS(span) == p.memory_size()) | |
322 return true; | |
323 | |
324 // If initial offset from start of object is computable, | |
325 // compute alignment within the vector. | |
326 int vw = vector_width_in_bytes(); | |
327 if (vw % span == 0) { | |
328 Node* init_nd = pre_end->init_trip(); | |
329 if (init_nd->is_Con() && p.invar() == NULL) { | |
330 int init = init_nd->bottom_type()->is_int()->get_con(); | |
331 | |
332 int init_offset = init * p.scale_in_bytes() + p.offset_in_bytes(); | |
333 assert(init_offset >= 0, "positive offset from object start"); | |
334 | |
335 if (span > 0) { | |
336 return (vw - (init_offset % vw)) % span == 0; | |
337 } else { | |
338 assert(span < 0, "nonzero stride * scale"); | |
339 return (init_offset % vw) % -span == 0; | |
340 } | |
341 } | |
342 } | |
343 return false; | |
344 } | |
345 | |
346 //---------------------------dependence_graph--------------------------- | |
347 // Construct dependency graph. | |
348 // Add dependence edges to load/store nodes for memory dependence | |
349 // A.out()->DependNode.in(1) and DependNode.out()->B.prec(x) | |
350 void SuperWord::dependence_graph() { | |
351 // First, assign a dependence node to each memory node | |
352 for (int i = 0; i < _block.length(); i++ ) { | |
353 Node *n = _block.at(i); | |
354 if (n->is_Mem() || n->is_Phi() && n->bottom_type() == Type::MEMORY) { | |
355 _dg.make_node(n); | |
356 } | |
357 } | |
358 | |
359 // For each memory slice, create the dependences | |
360 for (int i = 0; i < _mem_slice_head.length(); i++) { | |
361 Node* n = _mem_slice_head.at(i); | |
362 Node* n_tail = _mem_slice_tail.at(i); | |
363 | |
364 // Get slice in predecessor order (last is first) | |
365 mem_slice_preds(n_tail, n, _nlist); | |
366 | |
367 // Make the slice dependent on the root | |
368 DepMem* slice = _dg.dep(n); | |
369 _dg.make_edge(_dg.root(), slice); | |
370 | |
371 // Create a sink for the slice | |
372 DepMem* slice_sink = _dg.make_node(NULL); | |
373 _dg.make_edge(slice_sink, _dg.tail()); | |
374 | |
375 // Now visit each pair of memory ops, creating the edges | |
376 for (int j = _nlist.length() - 1; j >= 0 ; j--) { | |
377 Node* s1 = _nlist.at(j); | |
378 | |
379 // If no dependency yet, use slice | |
380 if (_dg.dep(s1)->in_cnt() == 0) { | |
381 _dg.make_edge(slice, s1); | |
382 } | |
383 SWPointer p1(s1->as_Mem(), this); | |
384 bool sink_dependent = true; | |
385 for (int k = j - 1; k >= 0; k--) { | |
386 Node* s2 = _nlist.at(k); | |
387 if (s1->is_Load() && s2->is_Load()) | |
388 continue; | |
389 SWPointer p2(s2->as_Mem(), this); | |
390 | |
391 int cmp = p1.cmp(p2); | |
392 if (SuperWordRTDepCheck && | |
393 p1.base() != p2.base() && p1.valid() && p2.valid()) { | |
394 // Create a runtime check to disambiguate | |
395 OrderedPair pp(p1.base(), p2.base()); | |
396 _disjoint_ptrs.append_if_missing(pp); | |
397 } else if (!SWPointer::not_equal(cmp)) { | |
398 // Possibly same address | |
399 _dg.make_edge(s1, s2); | |
400 sink_dependent = false; | |
401 } | |
402 } | |
403 if (sink_dependent) { | |
404 _dg.make_edge(s1, slice_sink); | |
405 } | |
406 } | |
407 #ifndef PRODUCT | |
408 if (TraceSuperWord) { | |
409 tty->print_cr("\nDependence graph for slice: %d", n->_idx); | |
410 for (int q = 0; q < _nlist.length(); q++) { | |
411 _dg.print(_nlist.at(q)); | |
412 } | |
413 tty->cr(); | |
414 } | |
415 #endif | |
416 _nlist.clear(); | |
417 } | |
418 | |
419 #ifndef PRODUCT | |
420 if (TraceSuperWord) { | |
421 tty->print_cr("\ndisjoint_ptrs: %s", _disjoint_ptrs.length() > 0 ? "" : "NONE"); | |
422 for (int r = 0; r < _disjoint_ptrs.length(); r++) { | |
423 _disjoint_ptrs.at(r).print(); | |
424 tty->cr(); | |
425 } | |
426 tty->cr(); | |
427 } | |
428 #endif | |
429 } | |
430 | |
431 //---------------------------mem_slice_preds--------------------------- | |
432 // Return a memory slice (node list) in predecessor order starting at "start" | |
433 void SuperWord::mem_slice_preds(Node* start, Node* stop, GrowableArray<Node*> &preds) { | |
434 assert(preds.length() == 0, "start empty"); | |
435 Node* n = start; | |
436 Node* prev = NULL; | |
437 while (true) { | |
438 assert(in_bb(n), "must be in block"); | |
439 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
440 Node* out = n->fast_out(i); | |
441 if (out->is_Load()) { | |
442 if (in_bb(out)) { | |
443 preds.push(out); | |
444 } | |
445 } else { | |
446 // FIXME | |
447 if (out->is_MergeMem() && !in_bb(out)) { | |
448 // Either unrolling is causing a memory edge not to disappear, | |
449 // or need to run igvn.optimize() again before SLP | |
450 } else if (out->is_Phi() && out->bottom_type() == Type::MEMORY && !in_bb(out)) { | |
451 // Ditto. Not sure what else to check further. | |
452 } else if (out->Opcode() == Op_StoreCM && out->in(4) == n) { | |
453 // StoreCM has an input edge used as a precedence edge. | |
454 // Maybe an issue when oop stores are vectorized. | |
455 } else { | |
456 assert(out == prev || prev == NULL, "no branches off of store slice"); | |
457 } | |
458 } | |
459 } | |
460 if (n == stop) break; | |
461 preds.push(n); | |
462 prev = n; | |
463 n = n->in(MemNode::Memory); | |
464 } | |
465 } | |
466 | |
467 //------------------------------stmts_can_pack--------------------------- | |
468 // Can s1 and s2 be in a pack with s1 immediately preceeding s2 and | |
469 // s1 aligned at "align" | |
470 bool SuperWord::stmts_can_pack(Node* s1, Node* s2, int align) { | |
471 if (isomorphic(s1, s2)) { | |
472 if (independent(s1, s2)) { | |
473 if (!exists_at(s1, 0) && !exists_at(s2, 1)) { | |
474 if (!s1->is_Mem() || are_adjacent_refs(s1, s2)) { | |
475 int s1_align = alignment(s1); | |
476 int s2_align = alignment(s2); | |
477 if (s1_align == top_align || s1_align == align) { | |
478 if (s2_align == top_align || s2_align == align + data_size(s1)) { | |
479 return true; | |
480 } | |
481 } | |
482 } | |
483 } | |
484 } | |
485 } | |
486 return false; | |
487 } | |
488 | |
489 //------------------------------exists_at--------------------------- | |
490 // Does s exist in a pack at position pos? | |
491 bool SuperWord::exists_at(Node* s, uint pos) { | |
492 for (int i = 0; i < _packset.length(); i++) { | |
493 Node_List* p = _packset.at(i); | |
494 if (p->at(pos) == s) { | |
495 return true; | |
496 } | |
497 } | |
498 return false; | |
499 } | |
500 | |
501 //------------------------------are_adjacent_refs--------------------------- | |
502 // Is s1 immediately before s2 in memory? | |
503 bool SuperWord::are_adjacent_refs(Node* s1, Node* s2) { | |
504 if (!s1->is_Mem() || !s2->is_Mem()) return false; | |
505 if (!in_bb(s1) || !in_bb(s2)) return false; | |
506 // FIXME - co_locate_pack fails on Stores in different mem-slices, so | |
507 // only pack memops that are in the same alias set until that's fixed. | |
508 if (_phase->C->get_alias_index(s1->as_Mem()->adr_type()) != | |
509 _phase->C->get_alias_index(s2->as_Mem()->adr_type())) | |
510 return false; | |
511 SWPointer p1(s1->as_Mem(), this); | |
512 SWPointer p2(s2->as_Mem(), this); | |
513 if (p1.base() != p2.base() || !p1.comparable(p2)) return false; | |
514 int diff = p2.offset_in_bytes() - p1.offset_in_bytes(); | |
515 return diff == data_size(s1); | |
516 } | |
517 | |
518 //------------------------------isomorphic--------------------------- | |
519 // Are s1 and s2 similar? | |
520 bool SuperWord::isomorphic(Node* s1, Node* s2) { | |
521 if (s1->Opcode() != s2->Opcode()) return false; | |
522 if (s1->req() != s2->req()) return false; | |
523 if (s1->in(0) != s2->in(0)) return false; | |
524 if (velt_type(s1) != velt_type(s2)) return false; | |
525 return true; | |
526 } | |
527 | |
528 //------------------------------independent--------------------------- | |
529 // Is there no data path from s1 to s2 or s2 to s1? | |
530 bool SuperWord::independent(Node* s1, Node* s2) { | |
531 // assert(s1->Opcode() == s2->Opcode(), "check isomorphic first"); | |
532 int d1 = depth(s1); | |
533 int d2 = depth(s2); | |
534 if (d1 == d2) return s1 != s2; | |
535 Node* deep = d1 > d2 ? s1 : s2; | |
536 Node* shallow = d1 > d2 ? s2 : s1; | |
537 | |
538 visited_clear(); | |
539 | |
540 return independent_path(shallow, deep); | |
541 } | |
542 | |
543 //------------------------------independent_path------------------------------ | |
544 // Helper for independent | |
545 bool SuperWord::independent_path(Node* shallow, Node* deep, uint dp) { | |
546 if (dp >= 1000) return false; // stop deep recursion | |
547 visited_set(deep); | |
548 int shal_depth = depth(shallow); | |
549 assert(shal_depth <= depth(deep), "must be"); | |
550 for (DepPreds preds(deep, _dg); !preds.done(); preds.next()) { | |
551 Node* pred = preds.current(); | |
552 if (in_bb(pred) && !visited_test(pred)) { | |
553 if (shallow == pred) { | |
554 return false; | |
555 } | |
556 if (shal_depth < depth(pred) && !independent_path(shallow, pred, dp+1)) { | |
557 return false; | |
558 } | |
559 } | |
560 } | |
561 return true; | |
562 } | |
563 | |
564 //------------------------------set_alignment--------------------------- | |
565 void SuperWord::set_alignment(Node* s1, Node* s2, int align) { | |
566 set_alignment(s1, align); | |
567 set_alignment(s2, align + data_size(s1)); | |
568 } | |
569 | |
570 //------------------------------data_size--------------------------- | |
571 int SuperWord::data_size(Node* s) { | |
572 const Type* t = velt_type(s); | |
573 BasicType bt = t->array_element_basic_type(); | |
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574 int bsize = type2aelembytes(bt); |
0 | 575 assert(bsize != 0, "valid size"); |
576 return bsize; | |
577 } | |
578 | |
579 //------------------------------extend_packlist--------------------------- | |
580 // Extend packset by following use->def and def->use links from pack members. | |
581 void SuperWord::extend_packlist() { | |
582 bool changed; | |
583 do { | |
584 changed = false; | |
585 for (int i = 0; i < _packset.length(); i++) { | |
586 Node_List* p = _packset.at(i); | |
587 changed |= follow_use_defs(p); | |
588 changed |= follow_def_uses(p); | |
589 } | |
590 } while (changed); | |
591 | |
592 #ifndef PRODUCT | |
593 if (TraceSuperWord) { | |
594 tty->print_cr("\nAfter extend_packlist"); | |
595 print_packset(); | |
596 } | |
597 #endif | |
598 } | |
599 | |
600 //------------------------------follow_use_defs--------------------------- | |
601 // Extend the packset by visiting operand definitions of nodes in pack p | |
602 bool SuperWord::follow_use_defs(Node_List* p) { | |
603 Node* s1 = p->at(0); | |
604 Node* s2 = p->at(1); | |
605 assert(p->size() == 2, "just checking"); | |
606 assert(s1->req() == s2->req(), "just checking"); | |
607 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); | |
608 | |
609 if (s1->is_Load()) return false; | |
610 | |
611 int align = alignment(s1); | |
612 bool changed = false; | |
613 int start = s1->is_Store() ? MemNode::ValueIn : 1; | |
614 int end = s1->is_Store() ? MemNode::ValueIn+1 : s1->req(); | |
615 for (int j = start; j < end; j++) { | |
616 Node* t1 = s1->in(j); | |
617 Node* t2 = s2->in(j); | |
618 if (!in_bb(t1) || !in_bb(t2)) | |
619 continue; | |
620 if (stmts_can_pack(t1, t2, align)) { | |
621 if (est_savings(t1, t2) >= 0) { | |
622 Node_List* pair = new Node_List(); | |
623 pair->push(t1); | |
624 pair->push(t2); | |
625 _packset.append(pair); | |
626 set_alignment(t1, t2, align); | |
627 changed = true; | |
628 } | |
629 } | |
630 } | |
631 return changed; | |
632 } | |
633 | |
634 //------------------------------follow_def_uses--------------------------- | |
635 // Extend the packset by visiting uses of nodes in pack p | |
636 bool SuperWord::follow_def_uses(Node_List* p) { | |
637 bool changed = false; | |
638 Node* s1 = p->at(0); | |
639 Node* s2 = p->at(1); | |
640 assert(p->size() == 2, "just checking"); | |
641 assert(s1->req() == s2->req(), "just checking"); | |
642 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); | |
643 | |
644 if (s1->is_Store()) return false; | |
645 | |
646 int align = alignment(s1); | |
647 int savings = -1; | |
648 Node* u1 = NULL; | |
649 Node* u2 = NULL; | |
650 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { | |
651 Node* t1 = s1->fast_out(i); | |
652 if (!in_bb(t1)) continue; | |
653 for (DUIterator_Fast jmax, j = s2->fast_outs(jmax); j < jmax; j++) { | |
654 Node* t2 = s2->fast_out(j); | |
655 if (!in_bb(t2)) continue; | |
656 if (!opnd_positions_match(s1, t1, s2, t2)) | |
657 continue; | |
658 if (stmts_can_pack(t1, t2, align)) { | |
659 int my_savings = est_savings(t1, t2); | |
660 if (my_savings > savings) { | |
661 savings = my_savings; | |
662 u1 = t1; | |
663 u2 = t2; | |
664 } | |
665 } | |
666 } | |
667 } | |
668 if (savings >= 0) { | |
669 Node_List* pair = new Node_List(); | |
670 pair->push(u1); | |
671 pair->push(u2); | |
672 _packset.append(pair); | |
673 set_alignment(u1, u2, align); | |
674 changed = true; | |
675 } | |
676 return changed; | |
677 } | |
678 | |
679 //---------------------------opnd_positions_match------------------------- | |
680 // Is the use of d1 in u1 at the same operand position as d2 in u2? | |
681 bool SuperWord::opnd_positions_match(Node* d1, Node* u1, Node* d2, Node* u2) { | |
682 uint ct = u1->req(); | |
683 if (ct != u2->req()) return false; | |
684 uint i1 = 0; | |
685 uint i2 = 0; | |
686 do { | |
687 for (i1++; i1 < ct; i1++) if (u1->in(i1) == d1) break; | |
688 for (i2++; i2 < ct; i2++) if (u2->in(i2) == d2) break; | |
689 if (i1 != i2) { | |
690 return false; | |
691 } | |
692 } while (i1 < ct); | |
693 return true; | |
694 } | |
695 | |
696 //------------------------------est_savings--------------------------- | |
697 // Estimate the savings from executing s1 and s2 as a pack | |
698 int SuperWord::est_savings(Node* s1, Node* s2) { | |
699 int save = 2 - 1; // 2 operations per instruction in packed form | |
700 | |
701 // inputs | |
702 for (uint i = 1; i < s1->req(); i++) { | |
703 Node* x1 = s1->in(i); | |
704 Node* x2 = s2->in(i); | |
705 if (x1 != x2) { | |
706 if (are_adjacent_refs(x1, x2)) { | |
707 save += adjacent_profit(x1, x2); | |
708 } else if (!in_packset(x1, x2)) { | |
709 save -= pack_cost(2); | |
710 } else { | |
711 save += unpack_cost(2); | |
712 } | |
713 } | |
714 } | |
715 | |
716 // uses of result | |
717 uint ct = 0; | |
718 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { | |
719 Node* s1_use = s1->fast_out(i); | |
720 for (int j = 0; j < _packset.length(); j++) { | |
721 Node_List* p = _packset.at(j); | |
722 if (p->at(0) == s1_use) { | |
723 for (DUIterator_Fast kmax, k = s2->fast_outs(kmax); k < kmax; k++) { | |
724 Node* s2_use = s2->fast_out(k); | |
725 if (p->at(p->size()-1) == s2_use) { | |
726 ct++; | |
727 if (are_adjacent_refs(s1_use, s2_use)) { | |
728 save += adjacent_profit(s1_use, s2_use); | |
729 } | |
730 } | |
731 } | |
732 } | |
733 } | |
734 } | |
735 | |
736 if (ct < s1->outcnt()) save += unpack_cost(1); | |
737 if (ct < s2->outcnt()) save += unpack_cost(1); | |
738 | |
739 return save; | |
740 } | |
741 | |
742 //------------------------------costs--------------------------- | |
743 int SuperWord::adjacent_profit(Node* s1, Node* s2) { return 2; } | |
744 int SuperWord::pack_cost(int ct) { return ct; } | |
745 int SuperWord::unpack_cost(int ct) { return ct; } | |
746 | |
747 //------------------------------combine_packs--------------------------- | |
748 // Combine packs A and B with A.last == B.first into A.first..,A.last,B.second,..B.last | |
749 void SuperWord::combine_packs() { | |
750 bool changed; | |
751 do { | |
752 changed = false; | |
753 for (int i = 0; i < _packset.length(); i++) { | |
754 Node_List* p1 = _packset.at(i); | |
755 if (p1 == NULL) continue; | |
756 for (int j = 0; j < _packset.length(); j++) { | |
757 Node_List* p2 = _packset.at(j); | |
758 if (p2 == NULL) continue; | |
759 if (p1->at(p1->size()-1) == p2->at(0)) { | |
760 for (uint k = 1; k < p2->size(); k++) { | |
761 p1->push(p2->at(k)); | |
762 } | |
763 _packset.at_put(j, NULL); | |
764 changed = true; | |
765 } | |
766 } | |
767 } | |
768 } while (changed); | |
769 | |
770 for (int i = _packset.length() - 1; i >= 0; i--) { | |
771 Node_List* p1 = _packset.at(i); | |
772 if (p1 == NULL) { | |
773 _packset.remove_at(i); | |
774 } | |
775 } | |
776 | |
777 #ifndef PRODUCT | |
778 if (TraceSuperWord) { | |
779 tty->print_cr("\nAfter combine_packs"); | |
780 print_packset(); | |
781 } | |
782 #endif | |
783 } | |
784 | |
785 //-----------------------------construct_my_pack_map-------------------------- | |
786 // Construct the map from nodes to packs. Only valid after the | |
787 // point where a node is only in one pack (after combine_packs). | |
788 void SuperWord::construct_my_pack_map() { | |
789 Node_List* rslt = NULL; | |
790 for (int i = 0; i < _packset.length(); i++) { | |
791 Node_List* p = _packset.at(i); | |
792 for (uint j = 0; j < p->size(); j++) { | |
793 Node* s = p->at(j); | |
794 assert(my_pack(s) == NULL, "only in one pack"); | |
795 set_my_pack(s, p); | |
796 } | |
797 } | |
798 } | |
799 | |
800 //------------------------------filter_packs--------------------------- | |
801 // Remove packs that are not implemented or not profitable. | |
802 void SuperWord::filter_packs() { | |
803 | |
804 // Remove packs that are not implemented | |
805 for (int i = _packset.length() - 1; i >= 0; i--) { | |
806 Node_List* pk = _packset.at(i); | |
807 bool impl = implemented(pk); | |
808 if (!impl) { | |
809 #ifndef PRODUCT | |
810 if (TraceSuperWord && Verbose) { | |
811 tty->print_cr("Unimplemented"); | |
812 pk->at(0)->dump(); | |
813 } | |
814 #endif | |
815 remove_pack_at(i); | |
816 } | |
817 } | |
818 | |
819 // Remove packs that are not profitable | |
820 bool changed; | |
821 do { | |
822 changed = false; | |
823 for (int i = _packset.length() - 1; i >= 0; i--) { | |
824 Node_List* pk = _packset.at(i); | |
825 bool prof = profitable(pk); | |
826 if (!prof) { | |
827 #ifndef PRODUCT | |
828 if (TraceSuperWord && Verbose) { | |
829 tty->print_cr("Unprofitable"); | |
830 pk->at(0)->dump(); | |
831 } | |
832 #endif | |
833 remove_pack_at(i); | |
834 changed = true; | |
835 } | |
836 } | |
837 } while (changed); | |
838 | |
839 #ifndef PRODUCT | |
840 if (TraceSuperWord) { | |
841 tty->print_cr("\nAfter filter_packs"); | |
842 print_packset(); | |
843 tty->cr(); | |
844 } | |
845 #endif | |
846 } | |
847 | |
848 //------------------------------implemented--------------------------- | |
849 // Can code be generated for pack p? | |
850 bool SuperWord::implemented(Node_List* p) { | |
851 Node* p0 = p->at(0); | |
852 int vopc = VectorNode::opcode(p0->Opcode(), p->size(), velt_type(p0)); | |
853 return vopc > 0 && Matcher::has_match_rule(vopc); | |
854 } | |
855 | |
856 //------------------------------profitable--------------------------- | |
857 // For pack p, are all operands and all uses (with in the block) vector? | |
858 bool SuperWord::profitable(Node_List* p) { | |
859 Node* p0 = p->at(0); | |
860 uint start, end; | |
861 vector_opd_range(p0, &start, &end); | |
862 | |
863 // Return false if some input is not vector and inside block | |
864 for (uint i = start; i < end; i++) { | |
865 if (!is_vector_use(p0, i)) { | |
866 // For now, return false if not scalar promotion case (inputs are the same.) | |
867 // Later, implement PackNode and allow differring, non-vector inputs | |
868 // (maybe just the ones from outside the block.) | |
869 Node* p0_def = p0->in(i); | |
870 for (uint j = 1; j < p->size(); j++) { | |
871 Node* use = p->at(j); | |
872 Node* def = use->in(i); | |
873 if (p0_def != def) | |
874 return false; | |
875 } | |
876 } | |
877 } | |
878 if (!p0->is_Store()) { | |
879 // For now, return false if not all uses are vector. | |
880 // Later, implement ExtractNode and allow non-vector uses (maybe | |
881 // just the ones outside the block.) | |
882 for (uint i = 0; i < p->size(); i++) { | |
883 Node* def = p->at(i); | |
884 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { | |
885 Node* use = def->fast_out(j); | |
886 for (uint k = 0; k < use->req(); k++) { | |
887 Node* n = use->in(k); | |
888 if (def == n) { | |
889 if (!is_vector_use(use, k)) { | |
890 return false; | |
891 } | |
892 } | |
893 } | |
894 } | |
895 } | |
896 } | |
897 return true; | |
898 } | |
899 | |
900 //------------------------------schedule--------------------------- | |
901 // Adjust the memory graph for the packed operations | |
902 void SuperWord::schedule() { | |
903 | |
904 // Co-locate in the memory graph the members of each memory pack | |
905 for (int i = 0; i < _packset.length(); i++) { | |
906 co_locate_pack(_packset.at(i)); | |
907 } | |
908 } | |
909 | |
910 //------------------------------co_locate_pack--------------------------- | |
911 // Within a pack, move stores down to the last executed store, | |
912 // and move loads up to the first executed load. | |
913 void SuperWord::co_locate_pack(Node_List* pk) { | |
914 if (pk->at(0)->is_Store()) { | |
915 // Push Stores down towards last executed pack member | |
916 MemNode* first = executed_first(pk)->as_Mem(); | |
917 MemNode* last = executed_last(pk)->as_Mem(); | |
918 MemNode* insert_pt = last; | |
919 MemNode* current = last->in(MemNode::Memory)->as_Mem(); | |
920 while (true) { | |
921 assert(in_bb(current), "stay in block"); | |
922 Node* my_mem = current->in(MemNode::Memory); | |
923 if (in_pack(current, pk)) { | |
924 // Forward users of my memory state to my input memory state | |
925 _igvn.hash_delete(current); | |
926 _igvn.hash_delete(my_mem); | |
927 for (DUIterator i = current->outs(); current->has_out(i); i++) { | |
928 Node* use = current->out(i); | |
929 if (use->is_Mem()) { | |
930 assert(use->in(MemNode::Memory) == current, "must be"); | |
931 _igvn.hash_delete(use); | |
932 use->set_req(MemNode::Memory, my_mem); | |
933 _igvn._worklist.push(use); | |
934 --i; // deleted this edge; rescan position | |
935 } | |
936 } | |
937 // put current immediately before insert_pt | |
938 current->set_req(MemNode::Memory, insert_pt->in(MemNode::Memory)); | |
939 _igvn.hash_delete(insert_pt); | |
940 insert_pt->set_req(MemNode::Memory, current); | |
941 _igvn._worklist.push(insert_pt); | |
942 _igvn._worklist.push(current); | |
943 insert_pt = current; | |
944 } | |
945 if (current == first) break; | |
946 current = my_mem->as_Mem(); | |
947 } | |
948 } else if (pk->at(0)->is_Load()) { | |
949 // Pull Loads up towards first executed pack member | |
950 LoadNode* first = executed_first(pk)->as_Load(); | |
951 Node* first_mem = first->in(MemNode::Memory); | |
952 _igvn.hash_delete(first_mem); | |
953 // Give each load same memory state as first | |
954 for (uint i = 0; i < pk->size(); i++) { | |
955 LoadNode* ld = pk->at(i)->as_Load(); | |
956 _igvn.hash_delete(ld); | |
957 ld->set_req(MemNode::Memory, first_mem); | |
958 _igvn._worklist.push(ld); | |
959 } | |
960 } | |
961 } | |
962 | |
963 //------------------------------output--------------------------- | |
964 // Convert packs into vector node operations | |
965 void SuperWord::output() { | |
966 if (_packset.length() == 0) return; | |
967 | |
968 // MUST ENSURE main loop's initial value is properly aligned: | |
969 // (iv_initial_value + min_iv_offset) % vector_width_in_bytes() == 0 | |
970 | |
971 align_initial_loop_index(align_to_ref()); | |
972 | |
973 // Insert extract (unpack) operations for scalar uses | |
974 for (int i = 0; i < _packset.length(); i++) { | |
975 insert_extracts(_packset.at(i)); | |
976 } | |
977 | |
978 for (int i = 0; i < _block.length(); i++) { | |
979 Node* n = _block.at(i); | |
980 Node_List* p = my_pack(n); | |
981 if (p && n == executed_last(p)) { | |
982 uint vlen = p->size(); | |
983 Node* vn = NULL; | |
984 Node* low_adr = p->at(0); | |
985 Node* first = executed_first(p); | |
986 if (n->is_Load()) { | |
987 int opc = n->Opcode(); | |
988 Node* ctl = n->in(MemNode::Control); | |
989 Node* mem = first->in(MemNode::Memory); | |
990 Node* adr = low_adr->in(MemNode::Address); | |
991 const TypePtr* atyp = n->adr_type(); | |
992 vn = VectorLoadNode::make(_phase->C, opc, ctl, mem, adr, atyp, vlen); | |
993 | |
994 } else if (n->is_Store()) { | |
995 // Promote value to be stored to vector | |
996 VectorNode* val = vector_opd(p, MemNode::ValueIn); | |
997 | |
998 int opc = n->Opcode(); | |
999 Node* ctl = n->in(MemNode::Control); | |
1000 Node* mem = first->in(MemNode::Memory); | |
1001 Node* adr = low_adr->in(MemNode::Address); | |
1002 const TypePtr* atyp = n->adr_type(); | |
1003 vn = VectorStoreNode::make(_phase->C, opc, ctl, mem, adr, atyp, val, vlen); | |
1004 | |
1005 } else if (n->req() == 3) { | |
1006 // Promote operands to vector | |
1007 Node* in1 = vector_opd(p, 1); | |
1008 Node* in2 = vector_opd(p, 2); | |
1009 vn = VectorNode::make(_phase->C, n->Opcode(), in1, in2, vlen, velt_type(n)); | |
1010 | |
1011 } else { | |
1012 ShouldNotReachHere(); | |
1013 } | |
1014 | |
1015 _phase->_igvn.register_new_node_with_optimizer(vn); | |
1016 _phase->set_ctrl(vn, _phase->get_ctrl(p->at(0))); | |
1017 for (uint j = 0; j < p->size(); j++) { | |
1018 Node* pm = p->at(j); | |
1019 _igvn.hash_delete(pm); | |
1020 _igvn.subsume_node(pm, vn); | |
1021 } | |
1022 _igvn._worklist.push(vn); | |
1023 } | |
1024 } | |
1025 } | |
1026 | |
1027 //------------------------------vector_opd--------------------------- | |
1028 // Create a vector operand for the nodes in pack p for operand: in(opd_idx) | |
1029 VectorNode* SuperWord::vector_opd(Node_List* p, int opd_idx) { | |
1030 Node* p0 = p->at(0); | |
1031 uint vlen = p->size(); | |
1032 Node* opd = p0->in(opd_idx); | |
1033 | |
1034 bool same_opd = true; | |
1035 for (uint i = 1; i < vlen; i++) { | |
1036 Node* pi = p->at(i); | |
1037 Node* in = pi->in(opd_idx); | |
1038 if (opd != in) { | |
1039 same_opd = false; | |
1040 break; | |
1041 } | |
1042 } | |
1043 | |
1044 if (same_opd) { | |
1045 if (opd->is_Vector()) { | |
1046 return (VectorNode*)opd; // input is matching vector | |
1047 } | |
1048 // Convert scalar input to vector. Use p0's type because it's container | |
1049 // maybe smaller than the operand's container. | |
1050 const Type* opd_t = velt_type(!in_bb(opd) ? p0 : opd); | |
1051 const Type* p0_t = velt_type(p0); | |
1052 if (p0_t->higher_equal(opd_t)) opd_t = p0_t; | |
1053 VectorNode* vn = VectorNode::scalar2vector(_phase->C, opd, vlen, opd_t); | |
1054 | |
1055 _phase->_igvn.register_new_node_with_optimizer(vn); | |
1056 _phase->set_ctrl(vn, _phase->get_ctrl(opd)); | |
1057 return vn; | |
1058 } | |
1059 | |
1060 // Insert pack operation | |
1061 const Type* opd_t = velt_type(!in_bb(opd) ? p0 : opd); | |
1062 PackNode* pk = PackNode::make(_phase->C, opd, opd_t); | |
1063 | |
1064 for (uint i = 1; i < vlen; i++) { | |
1065 Node* pi = p->at(i); | |
1066 Node* in = pi->in(opd_idx); | |
1067 assert(my_pack(in) == NULL, "Should already have been unpacked"); | |
1068 assert(opd_t == velt_type(!in_bb(in) ? pi : in), "all same type"); | |
1069 pk->add_opd(in); | |
1070 } | |
1071 _phase->_igvn.register_new_node_with_optimizer(pk); | |
1072 _phase->set_ctrl(pk, _phase->get_ctrl(opd)); | |
1073 return pk; | |
1074 } | |
1075 | |
1076 //------------------------------insert_extracts--------------------------- | |
1077 // If a use of pack p is not a vector use, then replace the | |
1078 // use with an extract operation. | |
1079 void SuperWord::insert_extracts(Node_List* p) { | |
1080 if (p->at(0)->is_Store()) return; | |
1081 assert(_n_idx_list.is_empty(), "empty (node,index) list"); | |
1082 | |
1083 // Inspect each use of each pack member. For each use that is | |
1084 // not a vector use, replace the use with an extract operation. | |
1085 | |
1086 for (uint i = 0; i < p->size(); i++) { | |
1087 Node* def = p->at(i); | |
1088 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { | |
1089 Node* use = def->fast_out(j); | |
1090 for (uint k = 0; k < use->req(); k++) { | |
1091 Node* n = use->in(k); | |
1092 if (def == n) { | |
1093 if (!is_vector_use(use, k)) { | |
1094 _n_idx_list.push(use, k); | |
1095 } | |
1096 } | |
1097 } | |
1098 } | |
1099 } | |
1100 | |
1101 while (_n_idx_list.is_nonempty()) { | |
1102 Node* use = _n_idx_list.node(); | |
1103 int idx = _n_idx_list.index(); | |
1104 _n_idx_list.pop(); | |
1105 Node* def = use->in(idx); | |
1106 | |
1107 // Insert extract operation | |
1108 _igvn.hash_delete(def); | |
1109 _igvn.hash_delete(use); | |
1110 int def_pos = alignment(def) / data_size(def); | |
1111 const Type* def_t = velt_type(def); | |
1112 | |
1113 Node* ex = ExtractNode::make(_phase->C, def, def_pos, def_t); | |
1114 _phase->_igvn.register_new_node_with_optimizer(ex); | |
1115 _phase->set_ctrl(ex, _phase->get_ctrl(def)); | |
1116 use->set_req(idx, ex); | |
1117 _igvn._worklist.push(def); | |
1118 _igvn._worklist.push(use); | |
1119 | |
1120 bb_insert_after(ex, bb_idx(def)); | |
1121 set_velt_type(ex, def_t); | |
1122 } | |
1123 } | |
1124 | |
1125 //------------------------------is_vector_use--------------------------- | |
1126 // Is use->in(u_idx) a vector use? | |
1127 bool SuperWord::is_vector_use(Node* use, int u_idx) { | |
1128 Node_List* u_pk = my_pack(use); | |
1129 if (u_pk == NULL) return false; | |
1130 Node* def = use->in(u_idx); | |
1131 Node_List* d_pk = my_pack(def); | |
1132 if (d_pk == NULL) { | |
1133 // check for scalar promotion | |
1134 Node* n = u_pk->at(0)->in(u_idx); | |
1135 for (uint i = 1; i < u_pk->size(); i++) { | |
1136 if (u_pk->at(i)->in(u_idx) != n) return false; | |
1137 } | |
1138 return true; | |
1139 } | |
1140 if (u_pk->size() != d_pk->size()) | |
1141 return false; | |
1142 for (uint i = 0; i < u_pk->size(); i++) { | |
1143 Node* ui = u_pk->at(i); | |
1144 Node* di = d_pk->at(i); | |
1145 if (ui->in(u_idx) != di || alignment(ui) != alignment(di)) | |
1146 return false; | |
1147 } | |
1148 return true; | |
1149 } | |
1150 | |
1151 //------------------------------construct_bb--------------------------- | |
1152 // Construct reverse postorder list of block members | |
1153 void SuperWord::construct_bb() { | |
1154 Node* entry = bb(); | |
1155 | |
1156 assert(_stk.length() == 0, "stk is empty"); | |
1157 assert(_block.length() == 0, "block is empty"); | |
1158 assert(_data_entry.length() == 0, "data_entry is empty"); | |
1159 assert(_mem_slice_head.length() == 0, "mem_slice_head is empty"); | |
1160 assert(_mem_slice_tail.length() == 0, "mem_slice_tail is empty"); | |
1161 | |
1162 // Find non-control nodes with no inputs from within block, | |
1163 // create a temporary map from node _idx to bb_idx for use | |
1164 // by the visited and post_visited sets, | |
1165 // and count number of nodes in block. | |
1166 int bb_ct = 0; | |
1167 for (uint i = 0; i < lpt()->_body.size(); i++ ) { | |
1168 Node *n = lpt()->_body.at(i); | |
1169 set_bb_idx(n, i); // Create a temporary map | |
1170 if (in_bb(n)) { | |
1171 bb_ct++; | |
1172 if (!n->is_CFG()) { | |
1173 bool found = false; | |
1174 for (uint j = 0; j < n->req(); j++) { | |
1175 Node* def = n->in(j); | |
1176 if (def && in_bb(def)) { | |
1177 found = true; | |
1178 break; | |
1179 } | |
1180 } | |
1181 if (!found) { | |
1182 assert(n != entry, "can't be entry"); | |
1183 _data_entry.push(n); | |
1184 } | |
1185 } | |
1186 } | |
1187 } | |
1188 | |
1189 // Find memory slices (head and tail) | |
1190 for (DUIterator_Fast imax, i = lp()->fast_outs(imax); i < imax; i++) { | |
1191 Node *n = lp()->fast_out(i); | |
1192 if (in_bb(n) && (n->is_Phi() && n->bottom_type() == Type::MEMORY)) { | |
1193 Node* n_tail = n->in(LoopNode::LoopBackControl); | |
1194 _mem_slice_head.push(n); | |
1195 _mem_slice_tail.push(n_tail); | |
1196 } | |
1197 } | |
1198 | |
1199 // Create an RPO list of nodes in block | |
1200 | |
1201 visited_clear(); | |
1202 post_visited_clear(); | |
1203 | |
1204 // Push all non-control nodes with no inputs from within block, then control entry | |
1205 for (int j = 0; j < _data_entry.length(); j++) { | |
1206 Node* n = _data_entry.at(j); | |
1207 visited_set(n); | |
1208 _stk.push(n); | |
1209 } | |
1210 visited_set(entry); | |
1211 _stk.push(entry); | |
1212 | |
1213 // Do a depth first walk over out edges | |
1214 int rpo_idx = bb_ct - 1; | |
1215 int size; | |
1216 while ((size = _stk.length()) > 0) { | |
1217 Node* n = _stk.top(); // Leave node on stack | |
1218 if (!visited_test_set(n)) { | |
1219 // forward arc in graph | |
1220 } else if (!post_visited_test(n)) { | |
1221 // cross or back arc | |
1222 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1223 Node *use = n->fast_out(i); | |
1224 if (in_bb(use) && !visited_test(use) && | |
1225 // Don't go around backedge | |
1226 (!use->is_Phi() || n == entry)) { | |
1227 _stk.push(use); | |
1228 } | |
1229 } | |
1230 if (_stk.length() == size) { | |
1231 // There were no additional uses, post visit node now | |
1232 _stk.pop(); // Remove node from stack | |
1233 assert(rpo_idx >= 0, ""); | |
1234 _block.at_put_grow(rpo_idx, n); | |
1235 rpo_idx--; | |
1236 post_visited_set(n); | |
1237 assert(rpo_idx >= 0 || _stk.is_empty(), ""); | |
1238 } | |
1239 } else { | |
1240 _stk.pop(); // Remove post-visited node from stack | |
1241 } | |
1242 } | |
1243 | |
1244 // Create real map of block indices for nodes | |
1245 for (int j = 0; j < _block.length(); j++) { | |
1246 Node* n = _block.at(j); | |
1247 set_bb_idx(n, j); | |
1248 } | |
1249 | |
1250 initialize_bb(); // Ensure extra info is allocated. | |
1251 | |
1252 #ifndef PRODUCT | |
1253 if (TraceSuperWord) { | |
1254 print_bb(); | |
1255 tty->print_cr("\ndata entry nodes: %s", _data_entry.length() > 0 ? "" : "NONE"); | |
1256 for (int m = 0; m < _data_entry.length(); m++) { | |
1257 tty->print("%3d ", m); | |
1258 _data_entry.at(m)->dump(); | |
1259 } | |
1260 tty->print_cr("\nmemory slices: %s", _mem_slice_head.length() > 0 ? "" : "NONE"); | |
1261 for (int m = 0; m < _mem_slice_head.length(); m++) { | |
1262 tty->print("%3d ", m); _mem_slice_head.at(m)->dump(); | |
1263 tty->print(" "); _mem_slice_tail.at(m)->dump(); | |
1264 } | |
1265 } | |
1266 #endif | |
1267 assert(rpo_idx == -1 && bb_ct == _block.length(), "all block members found"); | |
1268 } | |
1269 | |
1270 //------------------------------initialize_bb--------------------------- | |
1271 // Initialize per node info | |
1272 void SuperWord::initialize_bb() { | |
1273 Node* last = _block.at(_block.length() - 1); | |
1274 grow_node_info(bb_idx(last)); | |
1275 } | |
1276 | |
1277 //------------------------------bb_insert_after--------------------------- | |
1278 // Insert n into block after pos | |
1279 void SuperWord::bb_insert_after(Node* n, int pos) { | |
1280 int n_pos = pos + 1; | |
1281 // Make room | |
1282 for (int i = _block.length() - 1; i >= n_pos; i--) { | |
1283 _block.at_put_grow(i+1, _block.at(i)); | |
1284 } | |
1285 for (int j = _node_info.length() - 1; j >= n_pos; j--) { | |
1286 _node_info.at_put_grow(j+1, _node_info.at(j)); | |
1287 } | |
1288 // Set value | |
1289 _block.at_put_grow(n_pos, n); | |
1290 _node_info.at_put_grow(n_pos, SWNodeInfo::initial); | |
1291 // Adjust map from node->_idx to _block index | |
1292 for (int i = n_pos; i < _block.length(); i++) { | |
1293 set_bb_idx(_block.at(i), i); | |
1294 } | |
1295 } | |
1296 | |
1297 //------------------------------compute_max_depth--------------------------- | |
1298 // Compute max depth for expressions from beginning of block | |
1299 // Use to prune search paths during test for independence. | |
1300 void SuperWord::compute_max_depth() { | |
1301 int ct = 0; | |
1302 bool again; | |
1303 do { | |
1304 again = false; | |
1305 for (int i = 0; i < _block.length(); i++) { | |
1306 Node* n = _block.at(i); | |
1307 if (!n->is_Phi()) { | |
1308 int d_orig = depth(n); | |
1309 int d_in = 0; | |
1310 for (DepPreds preds(n, _dg); !preds.done(); preds.next()) { | |
1311 Node* pred = preds.current(); | |
1312 if (in_bb(pred)) { | |
1313 d_in = MAX2(d_in, depth(pred)); | |
1314 } | |
1315 } | |
1316 if (d_in + 1 != d_orig) { | |
1317 set_depth(n, d_in + 1); | |
1318 again = true; | |
1319 } | |
1320 } | |
1321 } | |
1322 ct++; | |
1323 } while (again); | |
1324 #ifndef PRODUCT | |
1325 if (TraceSuperWord && Verbose) | |
1326 tty->print_cr("compute_max_depth iterated: %d times", ct); | |
1327 #endif | |
1328 } | |
1329 | |
1330 //-------------------------compute_vector_element_type----------------------- | |
1331 // Compute necessary vector element type for expressions | |
1332 // This propagates backwards a narrower integer type when the | |
1333 // upper bits of the value are not needed. | |
1334 // Example: char a,b,c; a = b + c; | |
1335 // Normally the type of the add is integer, but for packed character | |
1336 // operations the type of the add needs to be char. | |
1337 void SuperWord::compute_vector_element_type() { | |
1338 #ifndef PRODUCT | |
1339 if (TraceSuperWord && Verbose) | |
1340 tty->print_cr("\ncompute_velt_type:"); | |
1341 #endif | |
1342 | |
1343 // Initial type | |
1344 for (int i = 0; i < _block.length(); i++) { | |
1345 Node* n = _block.at(i); | |
1346 const Type* t = n->is_Mem() ? Type::get_const_basic_type(n->as_Mem()->memory_type()) | |
1347 : _igvn.type(n); | |
1348 const Type* vt = container_type(t); | |
1349 set_velt_type(n, vt); | |
1350 } | |
1351 | |
1352 // Propagate narrowed type backwards through operations | |
1353 // that don't depend on higher order bits | |
1354 for (int i = _block.length() - 1; i >= 0; i--) { | |
1355 Node* n = _block.at(i); | |
1356 // Only integer types need be examined | |
1357 if (n->bottom_type()->isa_int()) { | |
1358 uint start, end; | |
1359 vector_opd_range(n, &start, &end); | |
1360 const Type* vt = velt_type(n); | |
1361 | |
1362 for (uint j = start; j < end; j++) { | |
1363 Node* in = n->in(j); | |
1364 // Don't propagate through a type conversion | |
1365 if (n->bottom_type() != in->bottom_type()) | |
1366 continue; | |
1367 switch(in->Opcode()) { | |
1368 case Op_AddI: case Op_AddL: | |
1369 case Op_SubI: case Op_SubL: | |
1370 case Op_MulI: case Op_MulL: | |
1371 case Op_AndI: case Op_AndL: | |
1372 case Op_OrI: case Op_OrL: | |
1373 case Op_XorI: case Op_XorL: | |
1374 case Op_LShiftI: case Op_LShiftL: | |
1375 case Op_CMoveI: case Op_CMoveL: | |
1376 if (in_bb(in)) { | |
1377 bool same_type = true; | |
1378 for (DUIterator_Fast kmax, k = in->fast_outs(kmax); k < kmax; k++) { | |
1379 Node *use = in->fast_out(k); | |
1380 if (!in_bb(use) || velt_type(use) != vt) { | |
1381 same_type = false; | |
1382 break; | |
1383 } | |
1384 } | |
1385 if (same_type) { | |
1386 set_velt_type(in, vt); | |
1387 } | |
1388 } | |
1389 } | |
1390 } | |
1391 } | |
1392 } | |
1393 #ifndef PRODUCT | |
1394 if (TraceSuperWord && Verbose) { | |
1395 for (int i = 0; i < _block.length(); i++) { | |
1396 Node* n = _block.at(i); | |
1397 velt_type(n)->dump(); | |
1398 tty->print("\t"); | |
1399 n->dump(); | |
1400 } | |
1401 } | |
1402 #endif | |
1403 } | |
1404 | |
1405 //------------------------------memory_alignment--------------------------- | |
1406 // Alignment within a vector memory reference | |
1407 int SuperWord::memory_alignment(MemNode* s, int iv_adjust_in_bytes) { | |
1408 SWPointer p(s, this); | |
1409 if (!p.valid()) { | |
1410 return bottom_align; | |
1411 } | |
1412 int offset = p.offset_in_bytes(); | |
1413 offset += iv_adjust_in_bytes; | |
1414 int off_rem = offset % vector_width_in_bytes(); | |
1415 int off_mod = off_rem >= 0 ? off_rem : off_rem + vector_width_in_bytes(); | |
1416 return off_mod; | |
1417 } | |
1418 | |
1419 //---------------------------container_type--------------------------- | |
1420 // Smallest type containing range of values | |
1421 const Type* SuperWord::container_type(const Type* t) { | |
1422 if (t->isa_aryptr()) { | |
1423 t = t->is_aryptr()->elem(); | |
1424 } | |
1425 if (t->basic_type() == T_INT) { | |
1426 if (t->higher_equal(TypeInt::BOOL)) return TypeInt::BOOL; | |
1427 if (t->higher_equal(TypeInt::BYTE)) return TypeInt::BYTE; | |
1428 if (t->higher_equal(TypeInt::CHAR)) return TypeInt::CHAR; | |
1429 if (t->higher_equal(TypeInt::SHORT)) return TypeInt::SHORT; | |
1430 return TypeInt::INT; | |
1431 } | |
1432 return t; | |
1433 } | |
1434 | |
1435 //-------------------------vector_opd_range----------------------- | |
1436 // (Start, end] half-open range defining which operands are vector | |
1437 void SuperWord::vector_opd_range(Node* n, uint* start, uint* end) { | |
1438 switch (n->Opcode()) { | |
1439 case Op_LoadB: case Op_LoadC: | |
1440 case Op_LoadI: case Op_LoadL: | |
1441 case Op_LoadF: case Op_LoadD: | |
1442 case Op_LoadP: | |
1443 *start = 0; | |
1444 *end = 0; | |
1445 return; | |
1446 case Op_StoreB: case Op_StoreC: | |
1447 case Op_StoreI: case Op_StoreL: | |
1448 case Op_StoreF: case Op_StoreD: | |
1449 case Op_StoreP: | |
1450 *start = MemNode::ValueIn; | |
1451 *end = *start + 1; | |
1452 return; | |
1453 case Op_LShiftI: case Op_LShiftL: | |
1454 *start = 1; | |
1455 *end = 2; | |
1456 return; | |
1457 case Op_CMoveI: case Op_CMoveL: case Op_CMoveF: case Op_CMoveD: | |
1458 *start = 2; | |
1459 *end = n->req(); | |
1460 return; | |
1461 } | |
1462 *start = 1; | |
1463 *end = n->req(); // default is all operands | |
1464 } | |
1465 | |
1466 //------------------------------in_packset--------------------------- | |
1467 // Are s1 and s2 in a pack pair and ordered as s1,s2? | |
1468 bool SuperWord::in_packset(Node* s1, Node* s2) { | |
1469 for (int i = 0; i < _packset.length(); i++) { | |
1470 Node_List* p = _packset.at(i); | |
1471 assert(p->size() == 2, "must be"); | |
1472 if (p->at(0) == s1 && p->at(p->size()-1) == s2) { | |
1473 return true; | |
1474 } | |
1475 } | |
1476 return false; | |
1477 } | |
1478 | |
1479 //------------------------------in_pack--------------------------- | |
1480 // Is s in pack p? | |
1481 Node_List* SuperWord::in_pack(Node* s, Node_List* p) { | |
1482 for (uint i = 0; i < p->size(); i++) { | |
1483 if (p->at(i) == s) { | |
1484 return p; | |
1485 } | |
1486 } | |
1487 return NULL; | |
1488 } | |
1489 | |
1490 //------------------------------remove_pack_at--------------------------- | |
1491 // Remove the pack at position pos in the packset | |
1492 void SuperWord::remove_pack_at(int pos) { | |
1493 Node_List* p = _packset.at(pos); | |
1494 for (uint i = 0; i < p->size(); i++) { | |
1495 Node* s = p->at(i); | |
1496 set_my_pack(s, NULL); | |
1497 } | |
1498 _packset.remove_at(pos); | |
1499 } | |
1500 | |
1501 //------------------------------executed_first--------------------------- | |
1502 // Return the node executed first in pack p. Uses the RPO block list | |
1503 // to determine order. | |
1504 Node* SuperWord::executed_first(Node_List* p) { | |
1505 Node* n = p->at(0); | |
1506 int n_rpo = bb_idx(n); | |
1507 for (uint i = 1; i < p->size(); i++) { | |
1508 Node* s = p->at(i); | |
1509 int s_rpo = bb_idx(s); | |
1510 if (s_rpo < n_rpo) { | |
1511 n = s; | |
1512 n_rpo = s_rpo; | |
1513 } | |
1514 } | |
1515 return n; | |
1516 } | |
1517 | |
1518 //------------------------------executed_last--------------------------- | |
1519 // Return the node executed last in pack p. | |
1520 Node* SuperWord::executed_last(Node_List* p) { | |
1521 Node* n = p->at(0); | |
1522 int n_rpo = bb_idx(n); | |
1523 for (uint i = 1; i < p->size(); i++) { | |
1524 Node* s = p->at(i); | |
1525 int s_rpo = bb_idx(s); | |
1526 if (s_rpo > n_rpo) { | |
1527 n = s; | |
1528 n_rpo = s_rpo; | |
1529 } | |
1530 } | |
1531 return n; | |
1532 } | |
1533 | |
1534 //----------------------------align_initial_loop_index--------------------------- | |
1535 // Adjust pre-loop limit so that in main loop, a load/store reference | |
1536 // to align_to_ref will be a position zero in the vector. | |
1537 // (iv + k) mod vector_align == 0 | |
1538 void SuperWord::align_initial_loop_index(MemNode* align_to_ref) { | |
1539 CountedLoopNode *main_head = lp()->as_CountedLoop(); | |
1540 assert(main_head->is_main_loop(), ""); | |
1541 CountedLoopEndNode* pre_end = get_pre_loop_end(main_head); | |
1542 assert(pre_end != NULL, ""); | |
1543 Node *pre_opaq1 = pre_end->limit(); | |
1544 assert(pre_opaq1->Opcode() == Op_Opaque1, ""); | |
1545 Opaque1Node *pre_opaq = (Opaque1Node*)pre_opaq1; | |
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1546 Node *lim0 = pre_opaq->in(1); |
0 | 1547 |
1548 // Where we put new limit calculations | |
1549 Node *pre_ctrl = pre_end->loopnode()->in(LoopNode::EntryControl); | |
1550 | |
1551 // Ensure the original loop limit is available from the | |
1552 // pre-loop Opaque1 node. | |
1553 Node *orig_limit = pre_opaq->original_loop_limit(); | |
1554 assert(orig_limit != NULL && _igvn.type(orig_limit) != Type::TOP, ""); | |
1555 | |
1556 SWPointer align_to_ref_p(align_to_ref, this); | |
1557 | |
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1558 // Given: |
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1559 // lim0 == original pre loop limit |
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1560 // V == v_align (power of 2) |
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1561 // invar == extra invariant piece of the address expression |
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1562 // e == k [ +/- invar ] |
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1563 // |
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1564 // When reassociating expressions involving '%' the basic rules are: |
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1565 // (a - b) % k == 0 => a % k == b % k |
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1566 // and: |
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1567 // (a + b) % k == 0 => a % k == (k - b) % k |
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1568 // |
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1569 // For stride > 0 && scale > 0, |
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1570 // Derive the new pre-loop limit "lim" such that the two constraints: |
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1571 // (1) lim = lim0 + N (where N is some positive integer < V) |
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1572 // (2) (e + lim) % V == 0 |
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1573 // are true. |
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1574 // |
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1575 // Substituting (1) into (2), |
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1576 // (e + lim0 + N) % V == 0 |
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1577 // solve for N: |
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1578 // N = (V - (e + lim0)) % V |
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1579 // substitute back into (1), so that new limit |
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1580 // lim = lim0 + (V - (e + lim0)) % V |
0 | 1581 // |
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1582 // For stride > 0 && scale < 0 |
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1583 // Constraints: |
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1584 // lim = lim0 + N |
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1585 // (e - lim) % V == 0 |
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1586 // Solving for lim: |
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1587 // (e - lim0 - N) % V == 0 |
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1588 // N = (e - lim0) % V |
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1589 // lim = lim0 + (e - lim0) % V |
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1590 // |
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1591 // For stride < 0 && scale > 0 |
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1592 // Constraints: |
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1593 // lim = lim0 - N |
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1594 // (e + lim) % V == 0 |
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1595 // Solving for lim: |
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1596 // (e + lim0 - N) % V == 0 |
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1597 // N = (e + lim0) % V |
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1598 // lim = lim0 - (e + lim0) % V |
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1599 // |
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1600 // For stride < 0 && scale < 0 |
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1601 // Constraints: |
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1602 // lim = lim0 - N |
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1603 // (e - lim) % V == 0 |
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1604 // Solving for lim: |
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1605 // (e - lim0 + N) % V == 0 |
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1606 // N = (V - (e - lim0)) % V |
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1607 // lim = lim0 - (V - (e - lim0)) % V |
0 | 1608 |
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1609 int stride = iv_stride(); |
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1610 int scale = align_to_ref_p.scale_in_bytes(); |
0 | 1611 int elt_size = align_to_ref_p.memory_size(); |
1612 int v_align = vector_width_in_bytes() / elt_size; | |
1613 int k = align_to_ref_p.offset_in_bytes() / elt_size; | |
1614 | |
1615 Node *kn = _igvn.intcon(k); | |
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1616 |
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1617 Node *e = kn; |
0 | 1618 if (align_to_ref_p.invar() != NULL) { |
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1619 // incorporate any extra invariant piece producing k +/- invar >>> log2(elt) |
0 | 1620 Node* log2_elt = _igvn.intcon(exact_log2(elt_size)); |
1621 Node* aref = new (_phase->C, 3) URShiftINode(align_to_ref_p.invar(), log2_elt); | |
1622 _phase->_igvn.register_new_node_with_optimizer(aref); | |
1623 _phase->set_ctrl(aref, pre_ctrl); | |
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1624 if (align_to_ref_p.negate_invar()) { |
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1625 e = new (_phase->C, 3) SubINode(e, aref); |
0 | 1626 } else { |
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1627 e = new (_phase->C, 3) AddINode(e, aref); |
0 | 1628 } |
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1629 _phase->_igvn.register_new_node_with_optimizer(e); |
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1630 _phase->set_ctrl(e, pre_ctrl); |
0 | 1631 } |
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1632 |
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1633 // compute e +/- lim0 |
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1634 if (scale < 0) { |
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1635 e = new (_phase->C, 3) SubINode(e, lim0); |
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1636 } else { |
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1637 e = new (_phase->C, 3) AddINode(e, lim0); |
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1638 } |
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1639 _phase->_igvn.register_new_node_with_optimizer(e); |
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1640 _phase->set_ctrl(e, pre_ctrl); |
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1641 |
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1642 if (stride * scale > 0) { |
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1643 // compute V - (e +/- lim0) |
0 | 1644 Node* va = _igvn.intcon(v_align); |
72
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1645 e = new (_phase->C, 3) SubINode(va, e); |
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1646 _phase->_igvn.register_new_node_with_optimizer(e); |
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1647 _phase->set_ctrl(e, pre_ctrl); |
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|
1648 } |
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|
1649 // compute N = (exp) % V |
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1650 Node* va_msk = _igvn.intcon(v_align - 1); |
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1651 Node* N = new (_phase->C, 3) AndINode(e, va_msk); |
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1652 _phase->_igvn.register_new_node_with_optimizer(N); |
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1653 _phase->set_ctrl(N, pre_ctrl); |
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|
1654 |
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|
1655 // substitute back into (1), so that new limit |
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1656 // lim = lim0 + N |
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1657 Node* lim; |
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1658 if (stride < 0) { |
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1659 lim = new (_phase->C, 3) SubINode(lim0, N); |
0 | 1660 } else { |
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1661 lim = new (_phase->C, 3) AddINode(lim0, N); |
0 | 1662 } |
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1663 _phase->_igvn.register_new_node_with_optimizer(lim); |
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1664 _phase->set_ctrl(lim, pre_ctrl); |
0 | 1665 Node* constrained = |
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1666 (stride > 0) ? (Node*) new (_phase->C,3) MinINode(lim, orig_limit) |
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1667 : (Node*) new (_phase->C,3) MaxINode(lim, orig_limit); |
0 | 1668 _phase->_igvn.register_new_node_with_optimizer(constrained); |
1669 _phase->set_ctrl(constrained, pre_ctrl); | |
1670 _igvn.hash_delete(pre_opaq); | |
1671 pre_opaq->set_req(1, constrained); | |
1672 } | |
1673 | |
1674 //----------------------------get_pre_loop_end--------------------------- | |
1675 // Find pre loop end from main loop. Returns null if none. | |
1676 CountedLoopEndNode* SuperWord::get_pre_loop_end(CountedLoopNode *cl) { | |
1677 Node *ctrl = cl->in(LoopNode::EntryControl); | |
1678 if (!ctrl->is_IfTrue() && !ctrl->is_IfFalse()) return NULL; | |
1679 Node *iffm = ctrl->in(0); | |
1680 if (!iffm->is_If()) return NULL; | |
1681 Node *p_f = iffm->in(0); | |
1682 if (!p_f->is_IfFalse()) return NULL; | |
1683 if (!p_f->in(0)->is_CountedLoopEnd()) return NULL; | |
1684 CountedLoopEndNode *pre_end = p_f->in(0)->as_CountedLoopEnd(); | |
1685 if (!pre_end->loopnode()->is_pre_loop()) return NULL; | |
1686 return pre_end; | |
1687 } | |
1688 | |
1689 | |
1690 //------------------------------init--------------------------- | |
1691 void SuperWord::init() { | |
1692 _dg.init(); | |
1693 _packset.clear(); | |
1694 _disjoint_ptrs.clear(); | |
1695 _block.clear(); | |
1696 _data_entry.clear(); | |
1697 _mem_slice_head.clear(); | |
1698 _mem_slice_tail.clear(); | |
1699 _node_info.clear(); | |
1700 _align_to_ref = NULL; | |
1701 _lpt = NULL; | |
1702 _lp = NULL; | |
1703 _bb = NULL; | |
1704 _iv = NULL; | |
1705 } | |
1706 | |
1707 //------------------------------print_packset--------------------------- | |
1708 void SuperWord::print_packset() { | |
1709 #ifndef PRODUCT | |
1710 tty->print_cr("packset"); | |
1711 for (int i = 0; i < _packset.length(); i++) { | |
1712 tty->print_cr("Pack: %d", i); | |
1713 Node_List* p = _packset.at(i); | |
1714 print_pack(p); | |
1715 } | |
1716 #endif | |
1717 } | |
1718 | |
1719 //------------------------------print_pack--------------------------- | |
1720 void SuperWord::print_pack(Node_List* p) { | |
1721 for (uint i = 0; i < p->size(); i++) { | |
1722 print_stmt(p->at(i)); | |
1723 } | |
1724 } | |
1725 | |
1726 //------------------------------print_bb--------------------------- | |
1727 void SuperWord::print_bb() { | |
1728 #ifndef PRODUCT | |
1729 tty->print_cr("\nBlock"); | |
1730 for (int i = 0; i < _block.length(); i++) { | |
1731 Node* n = _block.at(i); | |
1732 tty->print("%d ", i); | |
1733 if (n) { | |
1734 n->dump(); | |
1735 } | |
1736 } | |
1737 #endif | |
1738 } | |
1739 | |
1740 //------------------------------print_stmt--------------------------- | |
1741 void SuperWord::print_stmt(Node* s) { | |
1742 #ifndef PRODUCT | |
1743 tty->print(" align: %d \t", alignment(s)); | |
1744 s->dump(); | |
1745 #endif | |
1746 } | |
1747 | |
1748 //------------------------------blank--------------------------- | |
1749 char* SuperWord::blank(uint depth) { | |
1750 static char blanks[101]; | |
1751 assert(depth < 101, "too deep"); | |
1752 for (uint i = 0; i < depth; i++) blanks[i] = ' '; | |
1753 blanks[depth] = '\0'; | |
1754 return blanks; | |
1755 } | |
1756 | |
1757 | |
1758 //==============================SWPointer=========================== | |
1759 | |
1760 //----------------------------SWPointer------------------------ | |
1761 SWPointer::SWPointer(MemNode* mem, SuperWord* slp) : | |
1762 _mem(mem), _slp(slp), _base(NULL), _adr(NULL), | |
1763 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) { | |
1764 | |
1765 Node* adr = mem->in(MemNode::Address); | |
1766 if (!adr->is_AddP()) { | |
1767 assert(!valid(), "too complex"); | |
1768 return; | |
1769 } | |
1770 // Match AddP(base, AddP(ptr, k*iv [+ invariant]), constant) | |
1771 Node* base = adr->in(AddPNode::Base); | |
1772 for (int i = 0; i < 3; i++) { | |
1773 if (!scaled_iv_plus_offset(adr->in(AddPNode::Offset))) { | |
1774 assert(!valid(), "too complex"); | |
1775 return; | |
1776 } | |
1777 adr = adr->in(AddPNode::Address); | |
1778 if (base == adr || !adr->is_AddP()) { | |
1779 break; // stop looking at addp's | |
1780 } | |
1781 } | |
1782 _base = base; | |
1783 _adr = adr; | |
1784 assert(valid(), "Usable"); | |
1785 } | |
1786 | |
1787 // Following is used to create a temporary object during | |
1788 // the pattern match of an address expression. | |
1789 SWPointer::SWPointer(SWPointer* p) : | |
1790 _mem(p->_mem), _slp(p->_slp), _base(NULL), _adr(NULL), | |
1791 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) {} | |
1792 | |
1793 //------------------------scaled_iv_plus_offset-------------------- | |
1794 // Match: k*iv + offset | |
1795 // where: k is a constant that maybe zero, and | |
1796 // offset is (k2 [+/- invariant]) where k2 maybe zero and invariant is optional | |
1797 bool SWPointer::scaled_iv_plus_offset(Node* n) { | |
1798 if (scaled_iv(n)) { | |
1799 return true; | |
1800 } | |
1801 if (offset_plus_k(n)) { | |
1802 return true; | |
1803 } | |
1804 int opc = n->Opcode(); | |
1805 if (opc == Op_AddI) { | |
1806 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2))) { | |
1807 return true; | |
1808 } | |
1809 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { | |
1810 return true; | |
1811 } | |
1812 } else if (opc == Op_SubI) { | |
1813 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2), true)) { | |
1814 return true; | |
1815 } | |
1816 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { | |
1817 _scale *= -1; | |
1818 return true; | |
1819 } | |
1820 } | |
1821 return false; | |
1822 } | |
1823 | |
1824 //----------------------------scaled_iv------------------------ | |
1825 // Match: k*iv where k is a constant that's not zero | |
1826 bool SWPointer::scaled_iv(Node* n) { | |
1827 if (_scale != 0) { | |
1828 return false; // already found a scale | |
1829 } | |
1830 if (n == iv()) { | |
1831 _scale = 1; | |
1832 return true; | |
1833 } | |
1834 int opc = n->Opcode(); | |
1835 if (opc == Op_MulI) { | |
1836 if (n->in(1) == iv() && n->in(2)->is_Con()) { | |
1837 _scale = n->in(2)->get_int(); | |
1838 return true; | |
1839 } else if (n->in(2) == iv() && n->in(1)->is_Con()) { | |
1840 _scale = n->in(1)->get_int(); | |
1841 return true; | |
1842 } | |
1843 } else if (opc == Op_LShiftI) { | |
1844 if (n->in(1) == iv() && n->in(2)->is_Con()) { | |
1845 _scale = 1 << n->in(2)->get_int(); | |
1846 return true; | |
1847 } | |
1848 } else if (opc == Op_ConvI2L) { | |
1849 if (scaled_iv_plus_offset(n->in(1))) { | |
1850 return true; | |
1851 } | |
1852 } else if (opc == Op_LShiftL) { | |
1853 if (!has_iv() && _invar == NULL) { | |
1854 // Need to preserve the current _offset value, so | |
1855 // create a temporary object for this expression subtree. | |
1856 // Hacky, so should re-engineer the address pattern match. | |
1857 SWPointer tmp(this); | |
1858 if (tmp.scaled_iv_plus_offset(n->in(1))) { | |
1859 if (tmp._invar == NULL) { | |
1860 int mult = 1 << n->in(2)->get_int(); | |
1861 _scale = tmp._scale * mult; | |
1862 _offset += tmp._offset * mult; | |
1863 return true; | |
1864 } | |
1865 } | |
1866 } | |
1867 } | |
1868 return false; | |
1869 } | |
1870 | |
1871 //----------------------------offset_plus_k------------------------ | |
1872 // Match: offset is (k [+/- invariant]) | |
1873 // where k maybe zero and invariant is optional, but not both. | |
1874 bool SWPointer::offset_plus_k(Node* n, bool negate) { | |
1875 int opc = n->Opcode(); | |
1876 if (opc == Op_ConI) { | |
1877 _offset += negate ? -(n->get_int()) : n->get_int(); | |
1878 return true; | |
1879 } else if (opc == Op_ConL) { | |
1880 // Okay if value fits into an int | |
1881 const TypeLong* t = n->find_long_type(); | |
1882 if (t->higher_equal(TypeLong::INT)) { | |
1883 jlong loff = n->get_long(); | |
1884 jint off = (jint)loff; | |
1885 _offset += negate ? -off : loff; | |
1886 return true; | |
1887 } | |
1888 return false; | |
1889 } | |
1890 if (_invar != NULL) return false; // already have an invariant | |
1891 if (opc == Op_AddI) { | |
1892 if (n->in(2)->is_Con() && invariant(n->in(1))) { | |
1893 _negate_invar = negate; | |
1894 _invar = n->in(1); | |
1895 _offset += negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); | |
1896 return true; | |
1897 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { | |
1898 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); | |
1899 _negate_invar = negate; | |
1900 _invar = n->in(2); | |
1901 return true; | |
1902 } | |
1903 } | |
1904 if (opc == Op_SubI) { | |
1905 if (n->in(2)->is_Con() && invariant(n->in(1))) { | |
1906 _negate_invar = negate; | |
1907 _invar = n->in(1); | |
1908 _offset += !negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); | |
1909 return true; | |
1910 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { | |
1911 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); | |
1912 _negate_invar = !negate; | |
1913 _invar = n->in(2); | |
1914 return true; | |
1915 } | |
1916 } | |
1917 if (invariant(n)) { | |
1918 _negate_invar = negate; | |
1919 _invar = n; | |
1920 return true; | |
1921 } | |
1922 return false; | |
1923 } | |
1924 | |
1925 //----------------------------print------------------------ | |
1926 void SWPointer::print() { | |
1927 #ifndef PRODUCT | |
1928 tty->print("base: %d adr: %d scale: %d offset: %d invar: %c%d\n", | |
1929 _base != NULL ? _base->_idx : 0, | |
1930 _adr != NULL ? _adr->_idx : 0, | |
1931 _scale, _offset, | |
1932 _negate_invar?'-':'+', | |
1933 _invar != NULL ? _invar->_idx : 0); | |
1934 #endif | |
1935 } | |
1936 | |
1937 // ========================= OrderedPair ===================== | |
1938 | |
1939 const OrderedPair OrderedPair::initial; | |
1940 | |
1941 // ========================= SWNodeInfo ===================== | |
1942 | |
1943 const SWNodeInfo SWNodeInfo::initial; | |
1944 | |
1945 | |
1946 // ============================ DepGraph =========================== | |
1947 | |
1948 //------------------------------make_node--------------------------- | |
1949 // Make a new dependence graph node for an ideal node. | |
1950 DepMem* DepGraph::make_node(Node* node) { | |
1951 DepMem* m = new (_arena) DepMem(node); | |
1952 if (node != NULL) { | |
1953 assert(_map.at_grow(node->_idx) == NULL, "one init only"); | |
1954 _map.at_put_grow(node->_idx, m); | |
1955 } | |
1956 return m; | |
1957 } | |
1958 | |
1959 //------------------------------make_edge--------------------------- | |
1960 // Make a new dependence graph edge from dpred -> dsucc | |
1961 DepEdge* DepGraph::make_edge(DepMem* dpred, DepMem* dsucc) { | |
1962 DepEdge* e = new (_arena) DepEdge(dpred, dsucc, dsucc->in_head(), dpred->out_head()); | |
1963 dpred->set_out_head(e); | |
1964 dsucc->set_in_head(e); | |
1965 return e; | |
1966 } | |
1967 | |
1968 // ========================== DepMem ======================== | |
1969 | |
1970 //------------------------------in_cnt--------------------------- | |
1971 int DepMem::in_cnt() { | |
1972 int ct = 0; | |
1973 for (DepEdge* e = _in_head; e != NULL; e = e->next_in()) ct++; | |
1974 return ct; | |
1975 } | |
1976 | |
1977 //------------------------------out_cnt--------------------------- | |
1978 int DepMem::out_cnt() { | |
1979 int ct = 0; | |
1980 for (DepEdge* e = _out_head; e != NULL; e = e->next_out()) ct++; | |
1981 return ct; | |
1982 } | |
1983 | |
1984 //------------------------------print----------------------------- | |
1985 void DepMem::print() { | |
1986 #ifndef PRODUCT | |
1987 tty->print(" DepNode %d (", _node->_idx); | |
1988 for (DepEdge* p = _in_head; p != NULL; p = p->next_in()) { | |
1989 Node* pred = p->pred()->node(); | |
1990 tty->print(" %d", pred != NULL ? pred->_idx : 0); | |
1991 } | |
1992 tty->print(") ["); | |
1993 for (DepEdge* s = _out_head; s != NULL; s = s->next_out()) { | |
1994 Node* succ = s->succ()->node(); | |
1995 tty->print(" %d", succ != NULL ? succ->_idx : 0); | |
1996 } | |
1997 tty->print_cr(" ]"); | |
1998 #endif | |
1999 } | |
2000 | |
2001 // =========================== DepEdge ========================= | |
2002 | |
2003 //------------------------------DepPreds--------------------------- | |
2004 void DepEdge::print() { | |
2005 #ifndef PRODUCT | |
2006 tty->print_cr("DepEdge: %d [ %d ]", _pred->node()->_idx, _succ->node()->_idx); | |
2007 #endif | |
2008 } | |
2009 | |
2010 // =========================== DepPreds ========================= | |
2011 // Iterator over predecessor edges in the dependence graph. | |
2012 | |
2013 //------------------------------DepPreds--------------------------- | |
2014 DepPreds::DepPreds(Node* n, DepGraph& dg) { | |
2015 _n = n; | |
2016 _done = false; | |
2017 if (_n->is_Store() || _n->is_Load()) { | |
2018 _next_idx = MemNode::Address; | |
2019 _end_idx = n->req(); | |
2020 _dep_next = dg.dep(_n)->in_head(); | |
2021 } else if (_n->is_Mem()) { | |
2022 _next_idx = 0; | |
2023 _end_idx = 0; | |
2024 _dep_next = dg.dep(_n)->in_head(); | |
2025 } else { | |
2026 _next_idx = 1; | |
2027 _end_idx = _n->req(); | |
2028 _dep_next = NULL; | |
2029 } | |
2030 next(); | |
2031 } | |
2032 | |
2033 //------------------------------next--------------------------- | |
2034 void DepPreds::next() { | |
2035 if (_dep_next != NULL) { | |
2036 _current = _dep_next->pred()->node(); | |
2037 _dep_next = _dep_next->next_in(); | |
2038 } else if (_next_idx < _end_idx) { | |
2039 _current = _n->in(_next_idx++); | |
2040 } else { | |
2041 _done = true; | |
2042 } | |
2043 } | |
2044 | |
2045 // =========================== DepSuccs ========================= | |
2046 // Iterator over successor edges in the dependence graph. | |
2047 | |
2048 //------------------------------DepSuccs--------------------------- | |
2049 DepSuccs::DepSuccs(Node* n, DepGraph& dg) { | |
2050 _n = n; | |
2051 _done = false; | |
2052 if (_n->is_Load()) { | |
2053 _next_idx = 0; | |
2054 _end_idx = _n->outcnt(); | |
2055 _dep_next = dg.dep(_n)->out_head(); | |
2056 } else if (_n->is_Mem() || _n->is_Phi() && _n->bottom_type() == Type::MEMORY) { | |
2057 _next_idx = 0; | |
2058 _end_idx = 0; | |
2059 _dep_next = dg.dep(_n)->out_head(); | |
2060 } else { | |
2061 _next_idx = 0; | |
2062 _end_idx = _n->outcnt(); | |
2063 _dep_next = NULL; | |
2064 } | |
2065 next(); | |
2066 } | |
2067 | |
2068 //-------------------------------next--------------------------- | |
2069 void DepSuccs::next() { | |
2070 if (_dep_next != NULL) { | |
2071 _current = _dep_next->succ()->node(); | |
2072 _dep_next = _dep_next->next_out(); | |
2073 } else if (_next_idx < _end_idx) { | |
2074 _current = _n->raw_out(_next_idx++); | |
2075 } else { | |
2076 _done = true; | |
2077 } | |
2078 } |