Mercurial > hg > graal-compiler
annotate src/share/vm/opto/superword.cpp @ 1722:effb55808a18
Merge
author | johnc |
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date | Wed, 18 Aug 2010 17:44:33 -0400 |
parents | 6027dddc26c6 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
1585 | 2 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 */ |
23 | |
24 #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. | |
460 } else { | |
461 assert(out == prev || prev == NULL, "no branches off of store slice"); | |
462 } | |
463 } | |
464 } | |
465 if (n == stop) break; | |
466 preds.push(n); | |
467 prev = n; | |
468 n = n->in(MemNode::Memory); | |
469 } | |
470 } | |
471 | |
472 //------------------------------stmts_can_pack--------------------------- | |
605 | 473 // Can s1 and s2 be in a pack with s1 immediately preceding s2 and |
0 | 474 // s1 aligned at "align" |
475 bool SuperWord::stmts_can_pack(Node* s1, Node* s2, int align) { | |
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477 // Do not use superword for non-primitives |
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478 if((s1->is_Mem() && !is_java_primitive(s1->as_Mem()->memory_type())) || |
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479 (s2->is_Mem() && !is_java_primitive(s2->as_Mem()->memory_type()))) |
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480 return false; |
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481 |
0 | 482 if (isomorphic(s1, s2)) { |
483 if (independent(s1, s2)) { | |
484 if (!exists_at(s1, 0) && !exists_at(s2, 1)) { | |
485 if (!s1->is_Mem() || are_adjacent_refs(s1, s2)) { | |
486 int s1_align = alignment(s1); | |
487 int s2_align = alignment(s2); | |
488 if (s1_align == top_align || s1_align == align) { | |
489 if (s2_align == top_align || s2_align == align + data_size(s1)) { | |
490 return true; | |
491 } | |
492 } | |
493 } | |
494 } | |
495 } | |
496 } | |
497 return false; | |
498 } | |
499 | |
500 //------------------------------exists_at--------------------------- | |
501 // Does s exist in a pack at position pos? | |
502 bool SuperWord::exists_at(Node* s, uint pos) { | |
503 for (int i = 0; i < _packset.length(); i++) { | |
504 Node_List* p = _packset.at(i); | |
505 if (p->at(pos) == s) { | |
506 return true; | |
507 } | |
508 } | |
509 return false; | |
510 } | |
511 | |
512 //------------------------------are_adjacent_refs--------------------------- | |
513 // Is s1 immediately before s2 in memory? | |
514 bool SuperWord::are_adjacent_refs(Node* s1, Node* s2) { | |
515 if (!s1->is_Mem() || !s2->is_Mem()) return false; | |
516 if (!in_bb(s1) || !in_bb(s2)) return false; | |
1585 | 517 |
518 // Do not use superword for non-primitives | |
519 if (!is_java_primitive(s1->as_Mem()->memory_type()) || | |
520 !is_java_primitive(s2->as_Mem()->memory_type())) { | |
521 return false; | |
522 } | |
523 | |
0 | 524 // FIXME - co_locate_pack fails on Stores in different mem-slices, so |
525 // only pack memops that are in the same alias set until that's fixed. | |
526 if (_phase->C->get_alias_index(s1->as_Mem()->adr_type()) != | |
527 _phase->C->get_alias_index(s2->as_Mem()->adr_type())) | |
528 return false; | |
529 SWPointer p1(s1->as_Mem(), this); | |
530 SWPointer p2(s2->as_Mem(), this); | |
531 if (p1.base() != p2.base() || !p1.comparable(p2)) return false; | |
532 int diff = p2.offset_in_bytes() - p1.offset_in_bytes(); | |
533 return diff == data_size(s1); | |
534 } | |
535 | |
536 //------------------------------isomorphic--------------------------- | |
537 // Are s1 and s2 similar? | |
538 bool SuperWord::isomorphic(Node* s1, Node* s2) { | |
539 if (s1->Opcode() != s2->Opcode()) return false; | |
540 if (s1->req() != s2->req()) return false; | |
541 if (s1->in(0) != s2->in(0)) return false; | |
542 if (velt_type(s1) != velt_type(s2)) return false; | |
543 return true; | |
544 } | |
545 | |
546 //------------------------------independent--------------------------- | |
547 // Is there no data path from s1 to s2 or s2 to s1? | |
548 bool SuperWord::independent(Node* s1, Node* s2) { | |
549 // assert(s1->Opcode() == s2->Opcode(), "check isomorphic first"); | |
550 int d1 = depth(s1); | |
551 int d2 = depth(s2); | |
552 if (d1 == d2) return s1 != s2; | |
553 Node* deep = d1 > d2 ? s1 : s2; | |
554 Node* shallow = d1 > d2 ? s2 : s1; | |
555 | |
556 visited_clear(); | |
557 | |
558 return independent_path(shallow, deep); | |
559 } | |
560 | |
561 //------------------------------independent_path------------------------------ | |
562 // Helper for independent | |
563 bool SuperWord::independent_path(Node* shallow, Node* deep, uint dp) { | |
564 if (dp >= 1000) return false; // stop deep recursion | |
565 visited_set(deep); | |
566 int shal_depth = depth(shallow); | |
567 assert(shal_depth <= depth(deep), "must be"); | |
568 for (DepPreds preds(deep, _dg); !preds.done(); preds.next()) { | |
569 Node* pred = preds.current(); | |
570 if (in_bb(pred) && !visited_test(pred)) { | |
571 if (shallow == pred) { | |
572 return false; | |
573 } | |
574 if (shal_depth < depth(pred) && !independent_path(shallow, pred, dp+1)) { | |
575 return false; | |
576 } | |
577 } | |
578 } | |
579 return true; | |
580 } | |
581 | |
582 //------------------------------set_alignment--------------------------- | |
583 void SuperWord::set_alignment(Node* s1, Node* s2, int align) { | |
584 set_alignment(s1, align); | |
585 set_alignment(s2, align + data_size(s1)); | |
586 } | |
587 | |
588 //------------------------------data_size--------------------------- | |
589 int SuperWord::data_size(Node* s) { | |
590 const Type* t = velt_type(s); | |
591 BasicType bt = t->array_element_basic_type(); | |
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592 int bsize = type2aelembytes(bt); |
0 | 593 assert(bsize != 0, "valid size"); |
594 return bsize; | |
595 } | |
596 | |
597 //------------------------------extend_packlist--------------------------- | |
598 // Extend packset by following use->def and def->use links from pack members. | |
599 void SuperWord::extend_packlist() { | |
600 bool changed; | |
601 do { | |
602 changed = false; | |
603 for (int i = 0; i < _packset.length(); i++) { | |
604 Node_List* p = _packset.at(i); | |
605 changed |= follow_use_defs(p); | |
606 changed |= follow_def_uses(p); | |
607 } | |
608 } while (changed); | |
609 | |
610 #ifndef PRODUCT | |
611 if (TraceSuperWord) { | |
612 tty->print_cr("\nAfter extend_packlist"); | |
613 print_packset(); | |
614 } | |
615 #endif | |
616 } | |
617 | |
618 //------------------------------follow_use_defs--------------------------- | |
619 // Extend the packset by visiting operand definitions of nodes in pack p | |
620 bool SuperWord::follow_use_defs(Node_List* p) { | |
621 Node* s1 = p->at(0); | |
622 Node* s2 = p->at(1); | |
623 assert(p->size() == 2, "just checking"); | |
624 assert(s1->req() == s2->req(), "just checking"); | |
625 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); | |
626 | |
627 if (s1->is_Load()) return false; | |
628 | |
629 int align = alignment(s1); | |
630 bool changed = false; | |
631 int start = s1->is_Store() ? MemNode::ValueIn : 1; | |
632 int end = s1->is_Store() ? MemNode::ValueIn+1 : s1->req(); | |
633 for (int j = start; j < end; j++) { | |
634 Node* t1 = s1->in(j); | |
635 Node* t2 = s2->in(j); | |
636 if (!in_bb(t1) || !in_bb(t2)) | |
637 continue; | |
638 if (stmts_can_pack(t1, t2, align)) { | |
639 if (est_savings(t1, t2) >= 0) { | |
640 Node_List* pair = new Node_List(); | |
641 pair->push(t1); | |
642 pair->push(t2); | |
643 _packset.append(pair); | |
644 set_alignment(t1, t2, align); | |
645 changed = true; | |
646 } | |
647 } | |
648 } | |
649 return changed; | |
650 } | |
651 | |
652 //------------------------------follow_def_uses--------------------------- | |
653 // Extend the packset by visiting uses of nodes in pack p | |
654 bool SuperWord::follow_def_uses(Node_List* p) { | |
655 bool changed = false; | |
656 Node* s1 = p->at(0); | |
657 Node* s2 = p->at(1); | |
658 assert(p->size() == 2, "just checking"); | |
659 assert(s1->req() == s2->req(), "just checking"); | |
660 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); | |
661 | |
662 if (s1->is_Store()) return false; | |
663 | |
664 int align = alignment(s1); | |
665 int savings = -1; | |
666 Node* u1 = NULL; | |
667 Node* u2 = NULL; | |
668 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { | |
669 Node* t1 = s1->fast_out(i); | |
670 if (!in_bb(t1)) continue; | |
671 for (DUIterator_Fast jmax, j = s2->fast_outs(jmax); j < jmax; j++) { | |
672 Node* t2 = s2->fast_out(j); | |
673 if (!in_bb(t2)) continue; | |
674 if (!opnd_positions_match(s1, t1, s2, t2)) | |
675 continue; | |
676 if (stmts_can_pack(t1, t2, align)) { | |
677 int my_savings = est_savings(t1, t2); | |
678 if (my_savings > savings) { | |
679 savings = my_savings; | |
680 u1 = t1; | |
681 u2 = t2; | |
682 } | |
683 } | |
684 } | |
685 } | |
686 if (savings >= 0) { | |
687 Node_List* pair = new Node_List(); | |
688 pair->push(u1); | |
689 pair->push(u2); | |
690 _packset.append(pair); | |
691 set_alignment(u1, u2, align); | |
692 changed = true; | |
693 } | |
694 return changed; | |
695 } | |
696 | |
697 //---------------------------opnd_positions_match------------------------- | |
698 // Is the use of d1 in u1 at the same operand position as d2 in u2? | |
699 bool SuperWord::opnd_positions_match(Node* d1, Node* u1, Node* d2, Node* u2) { | |
700 uint ct = u1->req(); | |
701 if (ct != u2->req()) return false; | |
702 uint i1 = 0; | |
703 uint i2 = 0; | |
704 do { | |
705 for (i1++; i1 < ct; i1++) if (u1->in(i1) == d1) break; | |
706 for (i2++; i2 < ct; i2++) if (u2->in(i2) == d2) break; | |
707 if (i1 != i2) { | |
708 return false; | |
709 } | |
710 } while (i1 < ct); | |
711 return true; | |
712 } | |
713 | |
714 //------------------------------est_savings--------------------------- | |
715 // Estimate the savings from executing s1 and s2 as a pack | |
716 int SuperWord::est_savings(Node* s1, Node* s2) { | |
717 int save = 2 - 1; // 2 operations per instruction in packed form | |
718 | |
719 // inputs | |
720 for (uint i = 1; i < s1->req(); i++) { | |
721 Node* x1 = s1->in(i); | |
722 Node* x2 = s2->in(i); | |
723 if (x1 != x2) { | |
724 if (are_adjacent_refs(x1, x2)) { | |
725 save += adjacent_profit(x1, x2); | |
726 } else if (!in_packset(x1, x2)) { | |
727 save -= pack_cost(2); | |
728 } else { | |
729 save += unpack_cost(2); | |
730 } | |
731 } | |
732 } | |
733 | |
734 // uses of result | |
735 uint ct = 0; | |
736 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { | |
737 Node* s1_use = s1->fast_out(i); | |
738 for (int j = 0; j < _packset.length(); j++) { | |
739 Node_List* p = _packset.at(j); | |
740 if (p->at(0) == s1_use) { | |
741 for (DUIterator_Fast kmax, k = s2->fast_outs(kmax); k < kmax; k++) { | |
742 Node* s2_use = s2->fast_out(k); | |
743 if (p->at(p->size()-1) == s2_use) { | |
744 ct++; | |
745 if (are_adjacent_refs(s1_use, s2_use)) { | |
746 save += adjacent_profit(s1_use, s2_use); | |
747 } | |
748 } | |
749 } | |
750 } | |
751 } | |
752 } | |
753 | |
754 if (ct < s1->outcnt()) save += unpack_cost(1); | |
755 if (ct < s2->outcnt()) save += unpack_cost(1); | |
756 | |
757 return save; | |
758 } | |
759 | |
760 //------------------------------costs--------------------------- | |
761 int SuperWord::adjacent_profit(Node* s1, Node* s2) { return 2; } | |
762 int SuperWord::pack_cost(int ct) { return ct; } | |
763 int SuperWord::unpack_cost(int ct) { return ct; } | |
764 | |
765 //------------------------------combine_packs--------------------------- | |
766 // Combine packs A and B with A.last == B.first into A.first..,A.last,B.second,..B.last | |
767 void SuperWord::combine_packs() { | |
768 bool changed; | |
769 do { | |
770 changed = false; | |
771 for (int i = 0; i < _packset.length(); i++) { | |
772 Node_List* p1 = _packset.at(i); | |
773 if (p1 == NULL) continue; | |
774 for (int j = 0; j < _packset.length(); j++) { | |
775 Node_List* p2 = _packset.at(j); | |
776 if (p2 == NULL) continue; | |
777 if (p1->at(p1->size()-1) == p2->at(0)) { | |
778 for (uint k = 1; k < p2->size(); k++) { | |
779 p1->push(p2->at(k)); | |
780 } | |
781 _packset.at_put(j, NULL); | |
782 changed = true; | |
783 } | |
784 } | |
785 } | |
786 } while (changed); | |
787 | |
788 for (int i = _packset.length() - 1; i >= 0; i--) { | |
789 Node_List* p1 = _packset.at(i); | |
790 if (p1 == NULL) { | |
791 _packset.remove_at(i); | |
792 } | |
793 } | |
794 | |
795 #ifndef PRODUCT | |
796 if (TraceSuperWord) { | |
797 tty->print_cr("\nAfter combine_packs"); | |
798 print_packset(); | |
799 } | |
800 #endif | |
801 } | |
802 | |
803 //-----------------------------construct_my_pack_map-------------------------- | |
804 // Construct the map from nodes to packs. Only valid after the | |
805 // point where a node is only in one pack (after combine_packs). | |
806 void SuperWord::construct_my_pack_map() { | |
807 Node_List* rslt = NULL; | |
808 for (int i = 0; i < _packset.length(); i++) { | |
809 Node_List* p = _packset.at(i); | |
810 for (uint j = 0; j < p->size(); j++) { | |
811 Node* s = p->at(j); | |
812 assert(my_pack(s) == NULL, "only in one pack"); | |
813 set_my_pack(s, p); | |
814 } | |
815 } | |
816 } | |
817 | |
818 //------------------------------filter_packs--------------------------- | |
819 // Remove packs that are not implemented or not profitable. | |
820 void SuperWord::filter_packs() { | |
821 | |
822 // Remove packs that are not implemented | |
823 for (int i = _packset.length() - 1; i >= 0; i--) { | |
824 Node_List* pk = _packset.at(i); | |
825 bool impl = implemented(pk); | |
826 if (!impl) { | |
827 #ifndef PRODUCT | |
828 if (TraceSuperWord && Verbose) { | |
829 tty->print_cr("Unimplemented"); | |
830 pk->at(0)->dump(); | |
831 } | |
832 #endif | |
833 remove_pack_at(i); | |
834 } | |
835 } | |
836 | |
837 // Remove packs that are not profitable | |
838 bool changed; | |
839 do { | |
840 changed = false; | |
841 for (int i = _packset.length() - 1; i >= 0; i--) { | |
842 Node_List* pk = _packset.at(i); | |
843 bool prof = profitable(pk); | |
844 if (!prof) { | |
845 #ifndef PRODUCT | |
846 if (TraceSuperWord && Verbose) { | |
847 tty->print_cr("Unprofitable"); | |
848 pk->at(0)->dump(); | |
849 } | |
850 #endif | |
851 remove_pack_at(i); | |
852 changed = true; | |
853 } | |
854 } | |
855 } while (changed); | |
856 | |
857 #ifndef PRODUCT | |
858 if (TraceSuperWord) { | |
859 tty->print_cr("\nAfter filter_packs"); | |
860 print_packset(); | |
861 tty->cr(); | |
862 } | |
863 #endif | |
864 } | |
865 | |
866 //------------------------------implemented--------------------------- | |
867 // Can code be generated for pack p? | |
868 bool SuperWord::implemented(Node_List* p) { | |
869 Node* p0 = p->at(0); | |
870 int vopc = VectorNode::opcode(p0->Opcode(), p->size(), velt_type(p0)); | |
871 return vopc > 0 && Matcher::has_match_rule(vopc); | |
872 } | |
873 | |
874 //------------------------------profitable--------------------------- | |
875 // For pack p, are all operands and all uses (with in the block) vector? | |
876 bool SuperWord::profitable(Node_List* p) { | |
877 Node* p0 = p->at(0); | |
878 uint start, end; | |
879 vector_opd_range(p0, &start, &end); | |
880 | |
881 // Return false if some input is not vector and inside block | |
882 for (uint i = start; i < end; i++) { | |
883 if (!is_vector_use(p0, i)) { | |
884 // For now, return false if not scalar promotion case (inputs are the same.) | |
605 | 885 // Later, implement PackNode and allow differing, non-vector inputs |
0 | 886 // (maybe just the ones from outside the block.) |
887 Node* p0_def = p0->in(i); | |
888 for (uint j = 1; j < p->size(); j++) { | |
889 Node* use = p->at(j); | |
890 Node* def = use->in(i); | |
891 if (p0_def != def) | |
892 return false; | |
893 } | |
894 } | |
895 } | |
896 if (!p0->is_Store()) { | |
897 // For now, return false if not all uses are vector. | |
898 // Later, implement ExtractNode and allow non-vector uses (maybe | |
899 // just the ones outside the block.) | |
900 for (uint i = 0; i < p->size(); i++) { | |
901 Node* def = p->at(i); | |
902 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { | |
903 Node* use = def->fast_out(j); | |
904 for (uint k = 0; k < use->req(); k++) { | |
905 Node* n = use->in(k); | |
906 if (def == n) { | |
907 if (!is_vector_use(use, k)) { | |
908 return false; | |
909 } | |
910 } | |
911 } | |
912 } | |
913 } | |
914 } | |
915 return true; | |
916 } | |
917 | |
918 //------------------------------schedule--------------------------- | |
919 // Adjust the memory graph for the packed operations | |
920 void SuperWord::schedule() { | |
921 | |
922 // Co-locate in the memory graph the members of each memory pack | |
923 for (int i = 0; i < _packset.length(); i++) { | |
924 co_locate_pack(_packset.at(i)); | |
925 } | |
926 } | |
927 | |
667 | 928 //-------------------------------remove_and_insert------------------- |
929 //remove "current" from its current position in the memory graph and insert | |
930 //it after the appropriate insertion point (lip or uip) | |
931 void SuperWord::remove_and_insert(MemNode *current, MemNode *prev, MemNode *lip, | |
932 Node *uip, Unique_Node_List &sched_before) { | |
933 Node* my_mem = current->in(MemNode::Memory); | |
934 _igvn.hash_delete(current); | |
935 _igvn.hash_delete(my_mem); | |
936 | |
937 //remove current_store from its current position in the memmory graph | |
938 for (DUIterator i = current->outs(); current->has_out(i); i++) { | |
939 Node* use = current->out(i); | |
940 if (use->is_Mem()) { | |
941 assert(use->in(MemNode::Memory) == current, "must be"); | |
942 _igvn.hash_delete(use); | |
943 if (use == prev) { // connect prev to my_mem | |
944 use->set_req(MemNode::Memory, my_mem); | |
945 } else if (sched_before.member(use)) { | |
946 _igvn.hash_delete(uip); | |
947 use->set_req(MemNode::Memory, uip); | |
948 } else { | |
949 _igvn.hash_delete(lip); | |
950 use->set_req(MemNode::Memory, lip); | |
951 } | |
952 _igvn._worklist.push(use); | |
953 --i; //deleted this edge; rescan position | |
954 } | |
955 } | |
956 | |
957 bool sched_up = sched_before.member(current); | |
958 Node *insert_pt = sched_up ? uip : lip; | |
959 _igvn.hash_delete(insert_pt); | |
960 | |
961 // all uses of insert_pt's memory state should use current's instead | |
962 for (DUIterator i = insert_pt->outs(); insert_pt->has_out(i); i++) { | |
963 Node* use = insert_pt->out(i); | |
964 if (use->is_Mem()) { | |
965 assert(use->in(MemNode::Memory) == insert_pt, "must be"); | |
966 _igvn.hash_delete(use); | |
967 use->set_req(MemNode::Memory, current); | |
968 _igvn._worklist.push(use); | |
969 --i; //deleted this edge; rescan position | |
970 } else if (!sched_up && use->is_Phi() && use->bottom_type() == Type::MEMORY) { | |
971 uint pos; //lip (lower insert point) must be the last one in the memory slice | |
972 _igvn.hash_delete(use); | |
973 for (pos=1; pos < use->req(); pos++) { | |
974 if (use->in(pos) == insert_pt) break; | |
975 } | |
976 use->set_req(pos, current); | |
977 _igvn._worklist.push(use); | |
978 --i; | |
979 } | |
980 } | |
981 | |
982 //connect current to insert_pt | |
983 current->set_req(MemNode::Memory, insert_pt); | |
984 _igvn._worklist.push(current); | |
985 } | |
986 | |
987 //------------------------------co_locate_pack---------------------------------- | |
988 // To schedule a store pack, we need to move any sandwiched memory ops either before | |
989 // or after the pack, based upon dependence information: | |
990 // (1) If any store in the pack depends on the sandwiched memory op, the | |
991 // sandwiched memory op must be scheduled BEFORE the pack; | |
992 // (2) If a sandwiched memory op depends on any store in the pack, the | |
993 // sandwiched memory op must be scheduled AFTER the pack; | |
994 // (3) If a sandwiched memory op (say, memA) depends on another sandwiched | |
995 // memory op (say memB), memB must be scheduled before memA. So, if memA is | |
996 // scheduled before the pack, memB must also be scheduled before the pack; | |
997 // (4) If there is no dependence restriction for a sandwiched memory op, we simply | |
998 // schedule this store AFTER the pack | |
999 // (5) We know there is no dependence cycle, so there in no other case; | |
1000 // (6) Finally, all memory ops in another single pack should be moved in the same direction. | |
1001 // | |
952 | 1002 // To schedule a load pack, we use the memory state of either the first or the last load in |
1003 // the pack, based on the dependence constraint. | |
0 | 1004 void SuperWord::co_locate_pack(Node_List* pk) { |
1005 if (pk->at(0)->is_Store()) { | |
1006 MemNode* first = executed_first(pk)->as_Mem(); | |
1007 MemNode* last = executed_last(pk)->as_Mem(); | |
667 | 1008 Unique_Node_List schedule_before_pack; |
1009 Unique_Node_List memops; | |
1010 | |
0 | 1011 MemNode* current = last->in(MemNode::Memory)->as_Mem(); |
667 | 1012 MemNode* previous = last; |
0 | 1013 while (true) { |
1014 assert(in_bb(current), "stay in block"); | |
667 | 1015 memops.push(previous); |
1016 for (DUIterator i = current->outs(); current->has_out(i); i++) { | |
1017 Node* use = current->out(i); | |
1018 if (use->is_Mem() && use != previous) | |
1019 memops.push(use); | |
1020 } | |
1021 if(current == first) break; | |
1022 previous = current; | |
1023 current = current->in(MemNode::Memory)->as_Mem(); | |
1024 } | |
1025 | |
1026 // determine which memory operations should be scheduled before the pack | |
1027 for (uint i = 1; i < memops.size(); i++) { | |
1028 Node *s1 = memops.at(i); | |
1029 if (!in_pack(s1, pk) && !schedule_before_pack.member(s1)) { | |
1030 for (uint j = 0; j< i; j++) { | |
1031 Node *s2 = memops.at(j); | |
1032 if (!independent(s1, s2)) { | |
1033 if (in_pack(s2, pk) || schedule_before_pack.member(s2)) { | |
1034 schedule_before_pack.push(s1); //s1 must be scheduled before | |
1035 Node_List* mem_pk = my_pack(s1); | |
1036 if (mem_pk != NULL) { | |
1037 for (uint ii = 0; ii < mem_pk->size(); ii++) { | |
1038 Node* s = mem_pk->at(ii); // follow partner | |
1039 if (memops.member(s) && !schedule_before_pack.member(s)) | |
1040 schedule_before_pack.push(s); | |
1041 } | |
1042 } | |
1043 } | |
1044 } | |
1045 } | |
1046 } | |
1047 } | |
1048 | |
1049 MemNode* lower_insert_pt = last; | |
1050 Node* upper_insert_pt = first->in(MemNode::Memory); | |
1051 previous = last; //previous store in pk | |
1052 current = last->in(MemNode::Memory)->as_Mem(); | |
1053 | |
1054 //start scheduling from "last" to "first" | |
1055 while (true) { | |
1056 assert(in_bb(current), "stay in block"); | |
1057 assert(in_pack(previous, pk), "previous stays in pack"); | |
0 | 1058 Node* my_mem = current->in(MemNode::Memory); |
667 | 1059 |
0 | 1060 if (in_pack(current, pk)) { |
667 | 1061 // Forward users of my memory state (except "previous) to my input memory state |
0 | 1062 _igvn.hash_delete(current); |
1063 for (DUIterator i = current->outs(); current->has_out(i); i++) { | |
1064 Node* use = current->out(i); | |
667 | 1065 if (use->is_Mem() && use != previous) { |
0 | 1066 assert(use->in(MemNode::Memory) == current, "must be"); |
1067 _igvn.hash_delete(use); | |
667 | 1068 if (schedule_before_pack.member(use)) { |
1069 _igvn.hash_delete(upper_insert_pt); | |
1070 use->set_req(MemNode::Memory, upper_insert_pt); | |
1071 } else { | |
1072 _igvn.hash_delete(lower_insert_pt); | |
1073 use->set_req(MemNode::Memory, lower_insert_pt); | |
1074 } | |
0 | 1075 _igvn._worklist.push(use); |
1076 --i; // deleted this edge; rescan position | |
1077 } | |
1078 } | |
667 | 1079 previous = current; |
1080 } else { // !in_pack(current, pk) ==> a sandwiched store | |
1081 remove_and_insert(current, previous, lower_insert_pt, upper_insert_pt, schedule_before_pack); | |
0 | 1082 } |
667 | 1083 |
0 | 1084 if (current == first) break; |
1085 current = my_mem->as_Mem(); | |
667 | 1086 } // end while |
1087 } else if (pk->at(0)->is_Load()) { //load | |
952 | 1088 // all loads in the pack should have the same memory state. By default, |
1089 // we use the memory state of the last load. However, if any load could | |
1090 // not be moved down due to the dependence constraint, we use the memory | |
1091 // state of the first load. | |
1092 Node* last_mem = executed_last(pk)->in(MemNode::Memory); | |
1093 Node* first_mem = executed_first(pk)->in(MemNode::Memory); | |
1094 bool schedule_last = true; | |
1095 for (uint i = 0; i < pk->size(); i++) { | |
1096 Node* ld = pk->at(i); | |
1097 for (Node* current = last_mem; current != ld->in(MemNode::Memory); | |
1098 current=current->in(MemNode::Memory)) { | |
1099 assert(current != first_mem, "corrupted memory graph"); | |
1100 if(current->is_Mem() && !independent(current, ld)){ | |
1101 schedule_last = false; // a later store depends on this load | |
1102 break; | |
1103 } | |
1104 } | |
1105 } | |
1106 | |
1107 Node* mem_input = schedule_last ? last_mem : first_mem; | |
1108 _igvn.hash_delete(mem_input); | |
1109 // Give each load the same memory state | |
0 | 1110 for (uint i = 0; i < pk->size(); i++) { |
1111 LoadNode* ld = pk->at(i)->as_Load(); | |
1112 _igvn.hash_delete(ld); | |
952 | 1113 ld->set_req(MemNode::Memory, mem_input); |
0 | 1114 _igvn._worklist.push(ld); |
1115 } | |
1116 } | |
1117 } | |
1118 | |
1119 //------------------------------output--------------------------- | |
1120 // Convert packs into vector node operations | |
1121 void SuperWord::output() { | |
1122 if (_packset.length() == 0) return; | |
1123 | |
1124 // MUST ENSURE main loop's initial value is properly aligned: | |
1125 // (iv_initial_value + min_iv_offset) % vector_width_in_bytes() == 0 | |
1126 | |
1127 align_initial_loop_index(align_to_ref()); | |
1128 | |
1129 // Insert extract (unpack) operations for scalar uses | |
1130 for (int i = 0; i < _packset.length(); i++) { | |
1131 insert_extracts(_packset.at(i)); | |
1132 } | |
1133 | |
1134 for (int i = 0; i < _block.length(); i++) { | |
1135 Node* n = _block.at(i); | |
1136 Node_List* p = my_pack(n); | |
1137 if (p && n == executed_last(p)) { | |
1138 uint vlen = p->size(); | |
1139 Node* vn = NULL; | |
1140 Node* low_adr = p->at(0); | |
1141 Node* first = executed_first(p); | |
1142 if (n->is_Load()) { | |
1143 int opc = n->Opcode(); | |
1144 Node* ctl = n->in(MemNode::Control); | |
1145 Node* mem = first->in(MemNode::Memory); | |
1146 Node* adr = low_adr->in(MemNode::Address); | |
1147 const TypePtr* atyp = n->adr_type(); | |
1148 vn = VectorLoadNode::make(_phase->C, opc, ctl, mem, adr, atyp, vlen); | |
1149 | |
1150 } else if (n->is_Store()) { | |
1151 // Promote value to be stored to vector | |
1152 VectorNode* val = vector_opd(p, MemNode::ValueIn); | |
1153 | |
1154 int opc = n->Opcode(); | |
1155 Node* ctl = n->in(MemNode::Control); | |
1156 Node* mem = first->in(MemNode::Memory); | |
1157 Node* adr = low_adr->in(MemNode::Address); | |
1158 const TypePtr* atyp = n->adr_type(); | |
1159 vn = VectorStoreNode::make(_phase->C, opc, ctl, mem, adr, atyp, val, vlen); | |
1160 | |
1161 } else if (n->req() == 3) { | |
1162 // Promote operands to vector | |
1163 Node* in1 = vector_opd(p, 1); | |
1164 Node* in2 = vector_opd(p, 2); | |
1165 vn = VectorNode::make(_phase->C, n->Opcode(), in1, in2, vlen, velt_type(n)); | |
1166 | |
1167 } else { | |
1168 ShouldNotReachHere(); | |
1169 } | |
1170 | |
1171 _phase->_igvn.register_new_node_with_optimizer(vn); | |
1172 _phase->set_ctrl(vn, _phase->get_ctrl(p->at(0))); | |
1173 for (uint j = 0; j < p->size(); j++) { | |
1174 Node* pm = p->at(j); | |
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1175 _igvn.replace_node(pm, vn); |
0 | 1176 } |
1177 _igvn._worklist.push(vn); | |
1178 } | |
1179 } | |
1180 } | |
1181 | |
1182 //------------------------------vector_opd--------------------------- | |
1183 // Create a vector operand for the nodes in pack p for operand: in(opd_idx) | |
1184 VectorNode* SuperWord::vector_opd(Node_List* p, int opd_idx) { | |
1185 Node* p0 = p->at(0); | |
1186 uint vlen = p->size(); | |
1187 Node* opd = p0->in(opd_idx); | |
1188 | |
1189 bool same_opd = true; | |
1190 for (uint i = 1; i < vlen; i++) { | |
1191 Node* pi = p->at(i); | |
1192 Node* in = pi->in(opd_idx); | |
1193 if (opd != in) { | |
1194 same_opd = false; | |
1195 break; | |
1196 } | |
1197 } | |
1198 | |
1199 if (same_opd) { | |
1200 if (opd->is_Vector()) { | |
1201 return (VectorNode*)opd; // input is matching vector | |
1202 } | |
1203 // Convert scalar input to vector. Use p0's type because it's container | |
1204 // maybe smaller than the operand's container. | |
1205 const Type* opd_t = velt_type(!in_bb(opd) ? p0 : opd); | |
1206 const Type* p0_t = velt_type(p0); | |
1207 if (p0_t->higher_equal(opd_t)) opd_t = p0_t; | |
1208 VectorNode* vn = VectorNode::scalar2vector(_phase->C, opd, vlen, opd_t); | |
1209 | |
1210 _phase->_igvn.register_new_node_with_optimizer(vn); | |
1211 _phase->set_ctrl(vn, _phase->get_ctrl(opd)); | |
1212 return vn; | |
1213 } | |
1214 | |
1215 // Insert pack operation | |
1216 const Type* opd_t = velt_type(!in_bb(opd) ? p0 : opd); | |
1217 PackNode* pk = PackNode::make(_phase->C, opd, opd_t); | |
1218 | |
1219 for (uint i = 1; i < vlen; i++) { | |
1220 Node* pi = p->at(i); | |
1221 Node* in = pi->in(opd_idx); | |
1222 assert(my_pack(in) == NULL, "Should already have been unpacked"); | |
1223 assert(opd_t == velt_type(!in_bb(in) ? pi : in), "all same type"); | |
1224 pk->add_opd(in); | |
1225 } | |
1226 _phase->_igvn.register_new_node_with_optimizer(pk); | |
1227 _phase->set_ctrl(pk, _phase->get_ctrl(opd)); | |
1228 return pk; | |
1229 } | |
1230 | |
1231 //------------------------------insert_extracts--------------------------- | |
1232 // If a use of pack p is not a vector use, then replace the | |
1233 // use with an extract operation. | |
1234 void SuperWord::insert_extracts(Node_List* p) { | |
1235 if (p->at(0)->is_Store()) return; | |
1236 assert(_n_idx_list.is_empty(), "empty (node,index) list"); | |
1237 | |
1238 // Inspect each use of each pack member. For each use that is | |
1239 // not a vector use, replace the use with an extract operation. | |
1240 | |
1241 for (uint i = 0; i < p->size(); i++) { | |
1242 Node* def = p->at(i); | |
1243 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { | |
1244 Node* use = def->fast_out(j); | |
1245 for (uint k = 0; k < use->req(); k++) { | |
1246 Node* n = use->in(k); | |
1247 if (def == n) { | |
1248 if (!is_vector_use(use, k)) { | |
1249 _n_idx_list.push(use, k); | |
1250 } | |
1251 } | |
1252 } | |
1253 } | |
1254 } | |
1255 | |
1256 while (_n_idx_list.is_nonempty()) { | |
1257 Node* use = _n_idx_list.node(); | |
1258 int idx = _n_idx_list.index(); | |
1259 _n_idx_list.pop(); | |
1260 Node* def = use->in(idx); | |
1261 | |
1262 // Insert extract operation | |
1263 _igvn.hash_delete(def); | |
1264 _igvn.hash_delete(use); | |
1265 int def_pos = alignment(def) / data_size(def); | |
1266 const Type* def_t = velt_type(def); | |
1267 | |
1268 Node* ex = ExtractNode::make(_phase->C, def, def_pos, def_t); | |
1269 _phase->_igvn.register_new_node_with_optimizer(ex); | |
1270 _phase->set_ctrl(ex, _phase->get_ctrl(def)); | |
1271 use->set_req(idx, ex); | |
1272 _igvn._worklist.push(def); | |
1273 _igvn._worklist.push(use); | |
1274 | |
1275 bb_insert_after(ex, bb_idx(def)); | |
1276 set_velt_type(ex, def_t); | |
1277 } | |
1278 } | |
1279 | |
1280 //------------------------------is_vector_use--------------------------- | |
1281 // Is use->in(u_idx) a vector use? | |
1282 bool SuperWord::is_vector_use(Node* use, int u_idx) { | |
1283 Node_List* u_pk = my_pack(use); | |
1284 if (u_pk == NULL) return false; | |
1285 Node* def = use->in(u_idx); | |
1286 Node_List* d_pk = my_pack(def); | |
1287 if (d_pk == NULL) { | |
1288 // check for scalar promotion | |
1289 Node* n = u_pk->at(0)->in(u_idx); | |
1290 for (uint i = 1; i < u_pk->size(); i++) { | |
1291 if (u_pk->at(i)->in(u_idx) != n) return false; | |
1292 } | |
1293 return true; | |
1294 } | |
1295 if (u_pk->size() != d_pk->size()) | |
1296 return false; | |
1297 for (uint i = 0; i < u_pk->size(); i++) { | |
1298 Node* ui = u_pk->at(i); | |
1299 Node* di = d_pk->at(i); | |
1300 if (ui->in(u_idx) != di || alignment(ui) != alignment(di)) | |
1301 return false; | |
1302 } | |
1303 return true; | |
1304 } | |
1305 | |
1306 //------------------------------construct_bb--------------------------- | |
1307 // Construct reverse postorder list of block members | |
1308 void SuperWord::construct_bb() { | |
1309 Node* entry = bb(); | |
1310 | |
1311 assert(_stk.length() == 0, "stk is empty"); | |
1312 assert(_block.length() == 0, "block is empty"); | |
1313 assert(_data_entry.length() == 0, "data_entry is empty"); | |
1314 assert(_mem_slice_head.length() == 0, "mem_slice_head is empty"); | |
1315 assert(_mem_slice_tail.length() == 0, "mem_slice_tail is empty"); | |
1316 | |
1317 // Find non-control nodes with no inputs from within block, | |
1318 // create a temporary map from node _idx to bb_idx for use | |
1319 // by the visited and post_visited sets, | |
1320 // and count number of nodes in block. | |
1321 int bb_ct = 0; | |
1322 for (uint i = 0; i < lpt()->_body.size(); i++ ) { | |
1323 Node *n = lpt()->_body.at(i); | |
1324 set_bb_idx(n, i); // Create a temporary map | |
1325 if (in_bb(n)) { | |
1326 bb_ct++; | |
1327 if (!n->is_CFG()) { | |
1328 bool found = false; | |
1329 for (uint j = 0; j < n->req(); j++) { | |
1330 Node* def = n->in(j); | |
1331 if (def && in_bb(def)) { | |
1332 found = true; | |
1333 break; | |
1334 } | |
1335 } | |
1336 if (!found) { | |
1337 assert(n != entry, "can't be entry"); | |
1338 _data_entry.push(n); | |
1339 } | |
1340 } | |
1341 } | |
1342 } | |
1343 | |
1344 // Find memory slices (head and tail) | |
1345 for (DUIterator_Fast imax, i = lp()->fast_outs(imax); i < imax; i++) { | |
1346 Node *n = lp()->fast_out(i); | |
1347 if (in_bb(n) && (n->is_Phi() && n->bottom_type() == Type::MEMORY)) { | |
1348 Node* n_tail = n->in(LoopNode::LoopBackControl); | |
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1349 if (n_tail != n->in(LoopNode::EntryControl)) { |
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1350 _mem_slice_head.push(n); |
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1351 _mem_slice_tail.push(n_tail); |
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1352 } |
0 | 1353 } |
1354 } | |
1355 | |
1356 // Create an RPO list of nodes in block | |
1357 | |
1358 visited_clear(); | |
1359 post_visited_clear(); | |
1360 | |
1361 // Push all non-control nodes with no inputs from within block, then control entry | |
1362 for (int j = 0; j < _data_entry.length(); j++) { | |
1363 Node* n = _data_entry.at(j); | |
1364 visited_set(n); | |
1365 _stk.push(n); | |
1366 } | |
1367 visited_set(entry); | |
1368 _stk.push(entry); | |
1369 | |
1370 // Do a depth first walk over out edges | |
1371 int rpo_idx = bb_ct - 1; | |
1372 int size; | |
1373 while ((size = _stk.length()) > 0) { | |
1374 Node* n = _stk.top(); // Leave node on stack | |
1375 if (!visited_test_set(n)) { | |
1376 // forward arc in graph | |
1377 } else if (!post_visited_test(n)) { | |
1378 // cross or back arc | |
1379 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1380 Node *use = n->fast_out(i); | |
1381 if (in_bb(use) && !visited_test(use) && | |
1382 // Don't go around backedge | |
1383 (!use->is_Phi() || n == entry)) { | |
1384 _stk.push(use); | |
1385 } | |
1386 } | |
1387 if (_stk.length() == size) { | |
1388 // There were no additional uses, post visit node now | |
1389 _stk.pop(); // Remove node from stack | |
1390 assert(rpo_idx >= 0, ""); | |
1391 _block.at_put_grow(rpo_idx, n); | |
1392 rpo_idx--; | |
1393 post_visited_set(n); | |
1394 assert(rpo_idx >= 0 || _stk.is_empty(), ""); | |
1395 } | |
1396 } else { | |
1397 _stk.pop(); // Remove post-visited node from stack | |
1398 } | |
1399 } | |
1400 | |
1401 // Create real map of block indices for nodes | |
1402 for (int j = 0; j < _block.length(); j++) { | |
1403 Node* n = _block.at(j); | |
1404 set_bb_idx(n, j); | |
1405 } | |
1406 | |
1407 initialize_bb(); // Ensure extra info is allocated. | |
1408 | |
1409 #ifndef PRODUCT | |
1410 if (TraceSuperWord) { | |
1411 print_bb(); | |
1412 tty->print_cr("\ndata entry nodes: %s", _data_entry.length() > 0 ? "" : "NONE"); | |
1413 for (int m = 0; m < _data_entry.length(); m++) { | |
1414 tty->print("%3d ", m); | |
1415 _data_entry.at(m)->dump(); | |
1416 } | |
1417 tty->print_cr("\nmemory slices: %s", _mem_slice_head.length() > 0 ? "" : "NONE"); | |
1418 for (int m = 0; m < _mem_slice_head.length(); m++) { | |
1419 tty->print("%3d ", m); _mem_slice_head.at(m)->dump(); | |
1420 tty->print(" "); _mem_slice_tail.at(m)->dump(); | |
1421 } | |
1422 } | |
1423 #endif | |
1424 assert(rpo_idx == -1 && bb_ct == _block.length(), "all block members found"); | |
1425 } | |
1426 | |
1427 //------------------------------initialize_bb--------------------------- | |
1428 // Initialize per node info | |
1429 void SuperWord::initialize_bb() { | |
1430 Node* last = _block.at(_block.length() - 1); | |
1431 grow_node_info(bb_idx(last)); | |
1432 } | |
1433 | |
1434 //------------------------------bb_insert_after--------------------------- | |
1435 // Insert n into block after pos | |
1436 void SuperWord::bb_insert_after(Node* n, int pos) { | |
1437 int n_pos = pos + 1; | |
1438 // Make room | |
1439 for (int i = _block.length() - 1; i >= n_pos; i--) { | |
1440 _block.at_put_grow(i+1, _block.at(i)); | |
1441 } | |
1442 for (int j = _node_info.length() - 1; j >= n_pos; j--) { | |
1443 _node_info.at_put_grow(j+1, _node_info.at(j)); | |
1444 } | |
1445 // Set value | |
1446 _block.at_put_grow(n_pos, n); | |
1447 _node_info.at_put_grow(n_pos, SWNodeInfo::initial); | |
1448 // Adjust map from node->_idx to _block index | |
1449 for (int i = n_pos; i < _block.length(); i++) { | |
1450 set_bb_idx(_block.at(i), i); | |
1451 } | |
1452 } | |
1453 | |
1454 //------------------------------compute_max_depth--------------------------- | |
1455 // Compute max depth for expressions from beginning of block | |
1456 // Use to prune search paths during test for independence. | |
1457 void SuperWord::compute_max_depth() { | |
1458 int ct = 0; | |
1459 bool again; | |
1460 do { | |
1461 again = false; | |
1462 for (int i = 0; i < _block.length(); i++) { | |
1463 Node* n = _block.at(i); | |
1464 if (!n->is_Phi()) { | |
1465 int d_orig = depth(n); | |
1466 int d_in = 0; | |
1467 for (DepPreds preds(n, _dg); !preds.done(); preds.next()) { | |
1468 Node* pred = preds.current(); | |
1469 if (in_bb(pred)) { | |
1470 d_in = MAX2(d_in, depth(pred)); | |
1471 } | |
1472 } | |
1473 if (d_in + 1 != d_orig) { | |
1474 set_depth(n, d_in + 1); | |
1475 again = true; | |
1476 } | |
1477 } | |
1478 } | |
1479 ct++; | |
1480 } while (again); | |
1481 #ifndef PRODUCT | |
1482 if (TraceSuperWord && Verbose) | |
1483 tty->print_cr("compute_max_depth iterated: %d times", ct); | |
1484 #endif | |
1485 } | |
1486 | |
1487 //-------------------------compute_vector_element_type----------------------- | |
1488 // Compute necessary vector element type for expressions | |
1489 // This propagates backwards a narrower integer type when the | |
1490 // upper bits of the value are not needed. | |
1491 // Example: char a,b,c; a = b + c; | |
1492 // Normally the type of the add is integer, but for packed character | |
1493 // operations the type of the add needs to be char. | |
1494 void SuperWord::compute_vector_element_type() { | |
1495 #ifndef PRODUCT | |
1496 if (TraceSuperWord && Verbose) | |
1497 tty->print_cr("\ncompute_velt_type:"); | |
1498 #endif | |
1499 | |
1500 // Initial type | |
1501 for (int i = 0; i < _block.length(); i++) { | |
1502 Node* n = _block.at(i); | |
1503 const Type* t = n->is_Mem() ? Type::get_const_basic_type(n->as_Mem()->memory_type()) | |
1504 : _igvn.type(n); | |
1505 const Type* vt = container_type(t); | |
1506 set_velt_type(n, vt); | |
1507 } | |
1508 | |
1509 // Propagate narrowed type backwards through operations | |
1510 // that don't depend on higher order bits | |
1511 for (int i = _block.length() - 1; i >= 0; i--) { | |
1512 Node* n = _block.at(i); | |
1513 // Only integer types need be examined | |
1514 if (n->bottom_type()->isa_int()) { | |
1515 uint start, end; | |
1516 vector_opd_range(n, &start, &end); | |
1517 const Type* vt = velt_type(n); | |
1518 | |
1519 for (uint j = start; j < end; j++) { | |
1520 Node* in = n->in(j); | |
1521 // Don't propagate through a type conversion | |
1522 if (n->bottom_type() != in->bottom_type()) | |
1523 continue; | |
1524 switch(in->Opcode()) { | |
1525 case Op_AddI: case Op_AddL: | |
1526 case Op_SubI: case Op_SubL: | |
1527 case Op_MulI: case Op_MulL: | |
1528 case Op_AndI: case Op_AndL: | |
1529 case Op_OrI: case Op_OrL: | |
1530 case Op_XorI: case Op_XorL: | |
1531 case Op_LShiftI: case Op_LShiftL: | |
1532 case Op_CMoveI: case Op_CMoveL: | |
1533 if (in_bb(in)) { | |
1534 bool same_type = true; | |
1535 for (DUIterator_Fast kmax, k = in->fast_outs(kmax); k < kmax; k++) { | |
1536 Node *use = in->fast_out(k); | |
1537 if (!in_bb(use) || velt_type(use) != vt) { | |
1538 same_type = false; | |
1539 break; | |
1540 } | |
1541 } | |
1542 if (same_type) { | |
1543 set_velt_type(in, vt); | |
1544 } | |
1545 } | |
1546 } | |
1547 } | |
1548 } | |
1549 } | |
1550 #ifndef PRODUCT | |
1551 if (TraceSuperWord && Verbose) { | |
1552 for (int i = 0; i < _block.length(); i++) { | |
1553 Node* n = _block.at(i); | |
1554 velt_type(n)->dump(); | |
1555 tty->print("\t"); | |
1556 n->dump(); | |
1557 } | |
1558 } | |
1559 #endif | |
1560 } | |
1561 | |
1562 //------------------------------memory_alignment--------------------------- | |
1563 // Alignment within a vector memory reference | |
1564 int SuperWord::memory_alignment(MemNode* s, int iv_adjust_in_bytes) { | |
1565 SWPointer p(s, this); | |
1566 if (!p.valid()) { | |
1567 return bottom_align; | |
1568 } | |
1569 int offset = p.offset_in_bytes(); | |
1570 offset += iv_adjust_in_bytes; | |
1571 int off_rem = offset % vector_width_in_bytes(); | |
1572 int off_mod = off_rem >= 0 ? off_rem : off_rem + vector_width_in_bytes(); | |
1573 return off_mod; | |
1574 } | |
1575 | |
1576 //---------------------------container_type--------------------------- | |
1577 // Smallest type containing range of values | |
1578 const Type* SuperWord::container_type(const Type* t) { | |
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1579 const Type* tp = t->make_ptr(); |
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1580 if (tp && tp->isa_aryptr()) { |
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1581 t = tp->is_aryptr()->elem(); |
0 | 1582 } |
1583 if (t->basic_type() == T_INT) { | |
1584 if (t->higher_equal(TypeInt::BOOL)) return TypeInt::BOOL; | |
1585 if (t->higher_equal(TypeInt::BYTE)) return TypeInt::BYTE; | |
1586 if (t->higher_equal(TypeInt::CHAR)) return TypeInt::CHAR; | |
1587 if (t->higher_equal(TypeInt::SHORT)) return TypeInt::SHORT; | |
1588 return TypeInt::INT; | |
1589 } | |
1590 return t; | |
1591 } | |
1592 | |
1593 //-------------------------vector_opd_range----------------------- | |
1594 // (Start, end] half-open range defining which operands are vector | |
1595 void SuperWord::vector_opd_range(Node* n, uint* start, uint* end) { | |
1596 switch (n->Opcode()) { | |
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1597 case Op_LoadB: case Op_LoadUS: |
0 | 1598 case Op_LoadI: case Op_LoadL: |
1599 case Op_LoadF: case Op_LoadD: | |
1600 case Op_LoadP: | |
1601 *start = 0; | |
1602 *end = 0; | |
1603 return; | |
1604 case Op_StoreB: case Op_StoreC: | |
1605 case Op_StoreI: case Op_StoreL: | |
1606 case Op_StoreF: case Op_StoreD: | |
1607 case Op_StoreP: | |
1608 *start = MemNode::ValueIn; | |
1609 *end = *start + 1; | |
1610 return; | |
1611 case Op_LShiftI: case Op_LShiftL: | |
1612 *start = 1; | |
1613 *end = 2; | |
1614 return; | |
1615 case Op_CMoveI: case Op_CMoveL: case Op_CMoveF: case Op_CMoveD: | |
1616 *start = 2; | |
1617 *end = n->req(); | |
1618 return; | |
1619 } | |
1620 *start = 1; | |
1621 *end = n->req(); // default is all operands | |
1622 } | |
1623 | |
1624 //------------------------------in_packset--------------------------- | |
1625 // Are s1 and s2 in a pack pair and ordered as s1,s2? | |
1626 bool SuperWord::in_packset(Node* s1, Node* s2) { | |
1627 for (int i = 0; i < _packset.length(); i++) { | |
1628 Node_List* p = _packset.at(i); | |
1629 assert(p->size() == 2, "must be"); | |
1630 if (p->at(0) == s1 && p->at(p->size()-1) == s2) { | |
1631 return true; | |
1632 } | |
1633 } | |
1634 return false; | |
1635 } | |
1636 | |
1637 //------------------------------in_pack--------------------------- | |
1638 // Is s in pack p? | |
1639 Node_List* SuperWord::in_pack(Node* s, Node_List* p) { | |
1640 for (uint i = 0; i < p->size(); i++) { | |
1641 if (p->at(i) == s) { | |
1642 return p; | |
1643 } | |
1644 } | |
1645 return NULL; | |
1646 } | |
1647 | |
1648 //------------------------------remove_pack_at--------------------------- | |
1649 // Remove the pack at position pos in the packset | |
1650 void SuperWord::remove_pack_at(int pos) { | |
1651 Node_List* p = _packset.at(pos); | |
1652 for (uint i = 0; i < p->size(); i++) { | |
1653 Node* s = p->at(i); | |
1654 set_my_pack(s, NULL); | |
1655 } | |
1656 _packset.remove_at(pos); | |
1657 } | |
1658 | |
1659 //------------------------------executed_first--------------------------- | |
1660 // Return the node executed first in pack p. Uses the RPO block list | |
1661 // to determine order. | |
1662 Node* SuperWord::executed_first(Node_List* p) { | |
1663 Node* n = p->at(0); | |
1664 int n_rpo = bb_idx(n); | |
1665 for (uint i = 1; i < p->size(); i++) { | |
1666 Node* s = p->at(i); | |
1667 int s_rpo = bb_idx(s); | |
1668 if (s_rpo < n_rpo) { | |
1669 n = s; | |
1670 n_rpo = s_rpo; | |
1671 } | |
1672 } | |
1673 return n; | |
1674 } | |
1675 | |
1676 //------------------------------executed_last--------------------------- | |
1677 // Return the node executed last in pack p. | |
1678 Node* SuperWord::executed_last(Node_List* p) { | |
1679 Node* n = p->at(0); | |
1680 int n_rpo = bb_idx(n); | |
1681 for (uint i = 1; i < p->size(); i++) { | |
1682 Node* s = p->at(i); | |
1683 int s_rpo = bb_idx(s); | |
1684 if (s_rpo > n_rpo) { | |
1685 n = s; | |
1686 n_rpo = s_rpo; | |
1687 } | |
1688 } | |
1689 return n; | |
1690 } | |
1691 | |
1692 //----------------------------align_initial_loop_index--------------------------- | |
1693 // Adjust pre-loop limit so that in main loop, a load/store reference | |
1694 // to align_to_ref will be a position zero in the vector. | |
1695 // (iv + k) mod vector_align == 0 | |
1696 void SuperWord::align_initial_loop_index(MemNode* align_to_ref) { | |
1697 CountedLoopNode *main_head = lp()->as_CountedLoop(); | |
1698 assert(main_head->is_main_loop(), ""); | |
1699 CountedLoopEndNode* pre_end = get_pre_loop_end(main_head); | |
1700 assert(pre_end != NULL, ""); | |
1701 Node *pre_opaq1 = pre_end->limit(); | |
1702 assert(pre_opaq1->Opcode() == Op_Opaque1, ""); | |
1703 Opaque1Node *pre_opaq = (Opaque1Node*)pre_opaq1; | |
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1704 Node *lim0 = pre_opaq->in(1); |
0 | 1705 |
1706 // Where we put new limit calculations | |
1707 Node *pre_ctrl = pre_end->loopnode()->in(LoopNode::EntryControl); | |
1708 | |
1709 // Ensure the original loop limit is available from the | |
1710 // pre-loop Opaque1 node. | |
1711 Node *orig_limit = pre_opaq->original_loop_limit(); | |
1712 assert(orig_limit != NULL && _igvn.type(orig_limit) != Type::TOP, ""); | |
1713 | |
1714 SWPointer align_to_ref_p(align_to_ref, this); | |
1715 | |
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1716 // Given: |
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1717 // lim0 == original pre loop limit |
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1718 // V == v_align (power of 2) |
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1719 // invar == extra invariant piece of the address expression |
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1720 // e == k [ +/- invar ] |
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1721 // |
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1722 // When reassociating expressions involving '%' the basic rules are: |
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1723 // (a - b) % k == 0 => a % k == b % k |
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1724 // and: |
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1725 // (a + b) % k == 0 => a % k == (k - b) % k |
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1726 // |
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1727 // For stride > 0 && scale > 0, |
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1728 // Derive the new pre-loop limit "lim" such that the two constraints: |
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1729 // (1) lim = lim0 + N (where N is some positive integer < V) |
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1730 // (2) (e + lim) % V == 0 |
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1731 // are true. |
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1732 // |
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1733 // Substituting (1) into (2), |
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1734 // (e + lim0 + N) % V == 0 |
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1735 // solve for N: |
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1736 // N = (V - (e + lim0)) % V |
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1737 // substitute back into (1), so that new limit |
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1738 // lim = lim0 + (V - (e + lim0)) % V |
0 | 1739 // |
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1740 // For stride > 0 && scale < 0 |
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1741 // Constraints: |
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1742 // lim = lim0 + N |
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1743 // (e - lim) % V == 0 |
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1744 // Solving for lim: |
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1745 // (e - lim0 - N) % V == 0 |
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1746 // N = (e - lim0) % V |
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1747 // lim = lim0 + (e - lim0) % V |
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1748 // |
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1749 // For stride < 0 && scale > 0 |
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1750 // Constraints: |
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1751 // lim = lim0 - N |
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1752 // (e + lim) % V == 0 |
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1753 // Solving for lim: |
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1754 // (e + lim0 - N) % V == 0 |
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1755 // N = (e + lim0) % V |
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1756 // lim = lim0 - (e + lim0) % V |
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1757 // |
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1758 // For stride < 0 && scale < 0 |
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1759 // Constraints: |
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1760 // lim = lim0 - N |
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1761 // (e - lim) % V == 0 |
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1762 // Solving for lim: |
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1763 // (e - lim0 + N) % V == 0 |
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1764 // N = (V - (e - lim0)) % V |
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1765 // lim = lim0 - (V - (e - lim0)) % V |
0 | 1766 |
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1767 int stride = iv_stride(); |
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1768 int scale = align_to_ref_p.scale_in_bytes(); |
0 | 1769 int elt_size = align_to_ref_p.memory_size(); |
1770 int v_align = vector_width_in_bytes() / elt_size; | |
1771 int k = align_to_ref_p.offset_in_bytes() / elt_size; | |
1772 | |
1773 Node *kn = _igvn.intcon(k); | |
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1774 |
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1775 Node *e = kn; |
0 | 1776 if (align_to_ref_p.invar() != NULL) { |
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1777 // incorporate any extra invariant piece producing k +/- invar >>> log2(elt) |
0 | 1778 Node* log2_elt = _igvn.intcon(exact_log2(elt_size)); |
1779 Node* aref = new (_phase->C, 3) URShiftINode(align_to_ref_p.invar(), log2_elt); | |
1780 _phase->_igvn.register_new_node_with_optimizer(aref); | |
1781 _phase->set_ctrl(aref, pre_ctrl); | |
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1782 if (align_to_ref_p.negate_invar()) { |
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1783 e = new (_phase->C, 3) SubINode(e, aref); |
0 | 1784 } else { |
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1785 e = new (_phase->C, 3) AddINode(e, aref); |
0 | 1786 } |
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1787 _phase->_igvn.register_new_node_with_optimizer(e); |
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1788 _phase->set_ctrl(e, pre_ctrl); |
0 | 1789 } |
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1790 |
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1791 // compute e +/- lim0 |
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1792 if (scale < 0) { |
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1793 e = new (_phase->C, 3) SubINode(e, lim0); |
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1794 } else { |
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1795 e = new (_phase->C, 3) AddINode(e, lim0); |
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1796 } |
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1797 _phase->_igvn.register_new_node_with_optimizer(e); |
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1798 _phase->set_ctrl(e, pre_ctrl); |
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1799 |
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1800 if (stride * scale > 0) { |
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1801 // compute V - (e +/- lim0) |
0 | 1802 Node* va = _igvn.intcon(v_align); |
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1803 e = new (_phase->C, 3) SubINode(va, e); |
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1804 _phase->_igvn.register_new_node_with_optimizer(e); |
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1805 _phase->set_ctrl(e, pre_ctrl); |
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1806 } |
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1807 // compute N = (exp) % V |
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1808 Node* va_msk = _igvn.intcon(v_align - 1); |
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1809 Node* N = new (_phase->C, 3) AndINode(e, va_msk); |
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1810 _phase->_igvn.register_new_node_with_optimizer(N); |
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1811 _phase->set_ctrl(N, pre_ctrl); |
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1812 |
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1813 // substitute back into (1), so that new limit |
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1814 // lim = lim0 + N |
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1815 Node* lim; |
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1816 if (stride < 0) { |
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1817 lim = new (_phase->C, 3) SubINode(lim0, N); |
0 | 1818 } else { |
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1819 lim = new (_phase->C, 3) AddINode(lim0, N); |
0 | 1820 } |
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1821 _phase->_igvn.register_new_node_with_optimizer(lim); |
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1822 _phase->set_ctrl(lim, pre_ctrl); |
0 | 1823 Node* constrained = |
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1824 (stride > 0) ? (Node*) new (_phase->C,3) MinINode(lim, orig_limit) |
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1825 : (Node*) new (_phase->C,3) MaxINode(lim, orig_limit); |
0 | 1826 _phase->_igvn.register_new_node_with_optimizer(constrained); |
1827 _phase->set_ctrl(constrained, pre_ctrl); | |
1828 _igvn.hash_delete(pre_opaq); | |
1829 pre_opaq->set_req(1, constrained); | |
1830 } | |
1831 | |
1832 //----------------------------get_pre_loop_end--------------------------- | |
1833 // Find pre loop end from main loop. Returns null if none. | |
1834 CountedLoopEndNode* SuperWord::get_pre_loop_end(CountedLoopNode *cl) { | |
1835 Node *ctrl = cl->in(LoopNode::EntryControl); | |
1836 if (!ctrl->is_IfTrue() && !ctrl->is_IfFalse()) return NULL; | |
1837 Node *iffm = ctrl->in(0); | |
1838 if (!iffm->is_If()) return NULL; | |
1839 Node *p_f = iffm->in(0); | |
1840 if (!p_f->is_IfFalse()) return NULL; | |
1841 if (!p_f->in(0)->is_CountedLoopEnd()) return NULL; | |
1842 CountedLoopEndNode *pre_end = p_f->in(0)->as_CountedLoopEnd(); | |
1843 if (!pre_end->loopnode()->is_pre_loop()) return NULL; | |
1844 return pre_end; | |
1845 } | |
1846 | |
1847 | |
1848 //------------------------------init--------------------------- | |
1849 void SuperWord::init() { | |
1850 _dg.init(); | |
1851 _packset.clear(); | |
1852 _disjoint_ptrs.clear(); | |
1853 _block.clear(); | |
1854 _data_entry.clear(); | |
1855 _mem_slice_head.clear(); | |
1856 _mem_slice_tail.clear(); | |
1857 _node_info.clear(); | |
1858 _align_to_ref = NULL; | |
1859 _lpt = NULL; | |
1860 _lp = NULL; | |
1861 _bb = NULL; | |
1862 _iv = NULL; | |
1863 } | |
1864 | |
1865 //------------------------------print_packset--------------------------- | |
1866 void SuperWord::print_packset() { | |
1867 #ifndef PRODUCT | |
1868 tty->print_cr("packset"); | |
1869 for (int i = 0; i < _packset.length(); i++) { | |
1870 tty->print_cr("Pack: %d", i); | |
1871 Node_List* p = _packset.at(i); | |
1872 print_pack(p); | |
1873 } | |
1874 #endif | |
1875 } | |
1876 | |
1877 //------------------------------print_pack--------------------------- | |
1878 void SuperWord::print_pack(Node_List* p) { | |
1879 for (uint i = 0; i < p->size(); i++) { | |
1880 print_stmt(p->at(i)); | |
1881 } | |
1882 } | |
1883 | |
1884 //------------------------------print_bb--------------------------- | |
1885 void SuperWord::print_bb() { | |
1886 #ifndef PRODUCT | |
1887 tty->print_cr("\nBlock"); | |
1888 for (int i = 0; i < _block.length(); i++) { | |
1889 Node* n = _block.at(i); | |
1890 tty->print("%d ", i); | |
1891 if (n) { | |
1892 n->dump(); | |
1893 } | |
1894 } | |
1895 #endif | |
1896 } | |
1897 | |
1898 //------------------------------print_stmt--------------------------- | |
1899 void SuperWord::print_stmt(Node* s) { | |
1900 #ifndef PRODUCT | |
1901 tty->print(" align: %d \t", alignment(s)); | |
1902 s->dump(); | |
1903 #endif | |
1904 } | |
1905 | |
1906 //------------------------------blank--------------------------- | |
1907 char* SuperWord::blank(uint depth) { | |
1908 static char blanks[101]; | |
1909 assert(depth < 101, "too deep"); | |
1910 for (uint i = 0; i < depth; i++) blanks[i] = ' '; | |
1911 blanks[depth] = '\0'; | |
1912 return blanks; | |
1913 } | |
1914 | |
1915 | |
1916 //==============================SWPointer=========================== | |
1917 | |
1918 //----------------------------SWPointer------------------------ | |
1919 SWPointer::SWPointer(MemNode* mem, SuperWord* slp) : | |
1920 _mem(mem), _slp(slp), _base(NULL), _adr(NULL), | |
1921 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) { | |
1922 | |
1923 Node* adr = mem->in(MemNode::Address); | |
1924 if (!adr->is_AddP()) { | |
1925 assert(!valid(), "too complex"); | |
1926 return; | |
1927 } | |
1928 // Match AddP(base, AddP(ptr, k*iv [+ invariant]), constant) | |
1929 Node* base = adr->in(AddPNode::Base); | |
1058
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1930 //unsafe reference could not be aligned appropriately without runtime checking |
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1931 if (base == NULL || base->bottom_type() == Type::TOP) { |
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1932 assert(!valid(), "unsafe access"); |
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1933 return; |
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1934 } |
0 | 1935 for (int i = 0; i < 3; i++) { |
1936 if (!scaled_iv_plus_offset(adr->in(AddPNode::Offset))) { | |
1937 assert(!valid(), "too complex"); | |
1938 return; | |
1939 } | |
1940 adr = adr->in(AddPNode::Address); | |
1941 if (base == adr || !adr->is_AddP()) { | |
1942 break; // stop looking at addp's | |
1943 } | |
1944 } | |
1945 _base = base; | |
1946 _adr = adr; | |
1947 assert(valid(), "Usable"); | |
1948 } | |
1949 | |
1950 // Following is used to create a temporary object during | |
1951 // the pattern match of an address expression. | |
1952 SWPointer::SWPointer(SWPointer* p) : | |
1953 _mem(p->_mem), _slp(p->_slp), _base(NULL), _adr(NULL), | |
1954 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) {} | |
1955 | |
1956 //------------------------scaled_iv_plus_offset-------------------- | |
1957 // Match: k*iv + offset | |
1958 // where: k is a constant that maybe zero, and | |
1959 // offset is (k2 [+/- invariant]) where k2 maybe zero and invariant is optional | |
1960 bool SWPointer::scaled_iv_plus_offset(Node* n) { | |
1961 if (scaled_iv(n)) { | |
1962 return true; | |
1963 } | |
1964 if (offset_plus_k(n)) { | |
1965 return true; | |
1966 } | |
1967 int opc = n->Opcode(); | |
1968 if (opc == Op_AddI) { | |
1969 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2))) { | |
1970 return true; | |
1971 } | |
1972 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { | |
1973 return true; | |
1974 } | |
1975 } else if (opc == Op_SubI) { | |
1976 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2), true)) { | |
1977 return true; | |
1978 } | |
1979 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { | |
1980 _scale *= -1; | |
1981 return true; | |
1982 } | |
1983 } | |
1984 return false; | |
1985 } | |
1986 | |
1987 //----------------------------scaled_iv------------------------ | |
1988 // Match: k*iv where k is a constant that's not zero | |
1989 bool SWPointer::scaled_iv(Node* n) { | |
1990 if (_scale != 0) { | |
1991 return false; // already found a scale | |
1992 } | |
1993 if (n == iv()) { | |
1994 _scale = 1; | |
1995 return true; | |
1996 } | |
1997 int opc = n->Opcode(); | |
1998 if (opc == Op_MulI) { | |
1999 if (n->in(1) == iv() && n->in(2)->is_Con()) { | |
2000 _scale = n->in(2)->get_int(); | |
2001 return true; | |
2002 } else if (n->in(2) == iv() && n->in(1)->is_Con()) { | |
2003 _scale = n->in(1)->get_int(); | |
2004 return true; | |
2005 } | |
2006 } else if (opc == Op_LShiftI) { | |
2007 if (n->in(1) == iv() && n->in(2)->is_Con()) { | |
2008 _scale = 1 << n->in(2)->get_int(); | |
2009 return true; | |
2010 } | |
2011 } else if (opc == Op_ConvI2L) { | |
2012 if (scaled_iv_plus_offset(n->in(1))) { | |
2013 return true; | |
2014 } | |
2015 } else if (opc == Op_LShiftL) { | |
2016 if (!has_iv() && _invar == NULL) { | |
2017 // Need to preserve the current _offset value, so | |
2018 // create a temporary object for this expression subtree. | |
2019 // Hacky, so should re-engineer the address pattern match. | |
2020 SWPointer tmp(this); | |
2021 if (tmp.scaled_iv_plus_offset(n->in(1))) { | |
2022 if (tmp._invar == NULL) { | |
2023 int mult = 1 << n->in(2)->get_int(); | |
2024 _scale = tmp._scale * mult; | |
2025 _offset += tmp._offset * mult; | |
2026 return true; | |
2027 } | |
2028 } | |
2029 } | |
2030 } | |
2031 return false; | |
2032 } | |
2033 | |
2034 //----------------------------offset_plus_k------------------------ | |
2035 // Match: offset is (k [+/- invariant]) | |
2036 // where k maybe zero and invariant is optional, but not both. | |
2037 bool SWPointer::offset_plus_k(Node* n, bool negate) { | |
2038 int opc = n->Opcode(); | |
2039 if (opc == Op_ConI) { | |
2040 _offset += negate ? -(n->get_int()) : n->get_int(); | |
2041 return true; | |
2042 } else if (opc == Op_ConL) { | |
2043 // Okay if value fits into an int | |
2044 const TypeLong* t = n->find_long_type(); | |
2045 if (t->higher_equal(TypeLong::INT)) { | |
2046 jlong loff = n->get_long(); | |
2047 jint off = (jint)loff; | |
2048 _offset += negate ? -off : loff; | |
2049 return true; | |
2050 } | |
2051 return false; | |
2052 } | |
2053 if (_invar != NULL) return false; // already have an invariant | |
2054 if (opc == Op_AddI) { | |
2055 if (n->in(2)->is_Con() && invariant(n->in(1))) { | |
2056 _negate_invar = negate; | |
2057 _invar = n->in(1); | |
2058 _offset += negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); | |
2059 return true; | |
2060 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { | |
2061 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); | |
2062 _negate_invar = negate; | |
2063 _invar = n->in(2); | |
2064 return true; | |
2065 } | |
2066 } | |
2067 if (opc == Op_SubI) { | |
2068 if (n->in(2)->is_Con() && invariant(n->in(1))) { | |
2069 _negate_invar = negate; | |
2070 _invar = n->in(1); | |
2071 _offset += !negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); | |
2072 return true; | |
2073 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { | |
2074 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); | |
2075 _negate_invar = !negate; | |
2076 _invar = n->in(2); | |
2077 return true; | |
2078 } | |
2079 } | |
2080 if (invariant(n)) { | |
2081 _negate_invar = negate; | |
2082 _invar = n; | |
2083 return true; | |
2084 } | |
2085 return false; | |
2086 } | |
2087 | |
2088 //----------------------------print------------------------ | |
2089 void SWPointer::print() { | |
2090 #ifndef PRODUCT | |
2091 tty->print("base: %d adr: %d scale: %d offset: %d invar: %c%d\n", | |
2092 _base != NULL ? _base->_idx : 0, | |
2093 _adr != NULL ? _adr->_idx : 0, | |
2094 _scale, _offset, | |
2095 _negate_invar?'-':'+', | |
2096 _invar != NULL ? _invar->_idx : 0); | |
2097 #endif | |
2098 } | |
2099 | |
2100 // ========================= OrderedPair ===================== | |
2101 | |
2102 const OrderedPair OrderedPair::initial; | |
2103 | |
2104 // ========================= SWNodeInfo ===================== | |
2105 | |
2106 const SWNodeInfo SWNodeInfo::initial; | |
2107 | |
2108 | |
2109 // ============================ DepGraph =========================== | |
2110 | |
2111 //------------------------------make_node--------------------------- | |
2112 // Make a new dependence graph node for an ideal node. | |
2113 DepMem* DepGraph::make_node(Node* node) { | |
2114 DepMem* m = new (_arena) DepMem(node); | |
2115 if (node != NULL) { | |
2116 assert(_map.at_grow(node->_idx) == NULL, "one init only"); | |
2117 _map.at_put_grow(node->_idx, m); | |
2118 } | |
2119 return m; | |
2120 } | |
2121 | |
2122 //------------------------------make_edge--------------------------- | |
2123 // Make a new dependence graph edge from dpred -> dsucc | |
2124 DepEdge* DepGraph::make_edge(DepMem* dpred, DepMem* dsucc) { | |
2125 DepEdge* e = new (_arena) DepEdge(dpred, dsucc, dsucc->in_head(), dpred->out_head()); | |
2126 dpred->set_out_head(e); | |
2127 dsucc->set_in_head(e); | |
2128 return e; | |
2129 } | |
2130 | |
2131 // ========================== DepMem ======================== | |
2132 | |
2133 //------------------------------in_cnt--------------------------- | |
2134 int DepMem::in_cnt() { | |
2135 int ct = 0; | |
2136 for (DepEdge* e = _in_head; e != NULL; e = e->next_in()) ct++; | |
2137 return ct; | |
2138 } | |
2139 | |
2140 //------------------------------out_cnt--------------------------- | |
2141 int DepMem::out_cnt() { | |
2142 int ct = 0; | |
2143 for (DepEdge* e = _out_head; e != NULL; e = e->next_out()) ct++; | |
2144 return ct; | |
2145 } | |
2146 | |
2147 //------------------------------print----------------------------- | |
2148 void DepMem::print() { | |
2149 #ifndef PRODUCT | |
2150 tty->print(" DepNode %d (", _node->_idx); | |
2151 for (DepEdge* p = _in_head; p != NULL; p = p->next_in()) { | |
2152 Node* pred = p->pred()->node(); | |
2153 tty->print(" %d", pred != NULL ? pred->_idx : 0); | |
2154 } | |
2155 tty->print(") ["); | |
2156 for (DepEdge* s = _out_head; s != NULL; s = s->next_out()) { | |
2157 Node* succ = s->succ()->node(); | |
2158 tty->print(" %d", succ != NULL ? succ->_idx : 0); | |
2159 } | |
2160 tty->print_cr(" ]"); | |
2161 #endif | |
2162 } | |
2163 | |
2164 // =========================== DepEdge ========================= | |
2165 | |
2166 //------------------------------DepPreds--------------------------- | |
2167 void DepEdge::print() { | |
2168 #ifndef PRODUCT | |
2169 tty->print_cr("DepEdge: %d [ %d ]", _pred->node()->_idx, _succ->node()->_idx); | |
2170 #endif | |
2171 } | |
2172 | |
2173 // =========================== DepPreds ========================= | |
2174 // Iterator over predecessor edges in the dependence graph. | |
2175 | |
2176 //------------------------------DepPreds--------------------------- | |
2177 DepPreds::DepPreds(Node* n, DepGraph& dg) { | |
2178 _n = n; | |
2179 _done = false; | |
2180 if (_n->is_Store() || _n->is_Load()) { | |
2181 _next_idx = MemNode::Address; | |
2182 _end_idx = n->req(); | |
2183 _dep_next = dg.dep(_n)->in_head(); | |
2184 } else if (_n->is_Mem()) { | |
2185 _next_idx = 0; | |
2186 _end_idx = 0; | |
2187 _dep_next = dg.dep(_n)->in_head(); | |
2188 } else { | |
2189 _next_idx = 1; | |
2190 _end_idx = _n->req(); | |
2191 _dep_next = NULL; | |
2192 } | |
2193 next(); | |
2194 } | |
2195 | |
2196 //------------------------------next--------------------------- | |
2197 void DepPreds::next() { | |
2198 if (_dep_next != NULL) { | |
2199 _current = _dep_next->pred()->node(); | |
2200 _dep_next = _dep_next->next_in(); | |
2201 } else if (_next_idx < _end_idx) { | |
2202 _current = _n->in(_next_idx++); | |
2203 } else { | |
2204 _done = true; | |
2205 } | |
2206 } | |
2207 | |
2208 // =========================== DepSuccs ========================= | |
2209 // Iterator over successor edges in the dependence graph. | |
2210 | |
2211 //------------------------------DepSuccs--------------------------- | |
2212 DepSuccs::DepSuccs(Node* n, DepGraph& dg) { | |
2213 _n = n; | |
2214 _done = false; | |
2215 if (_n->is_Load()) { | |
2216 _next_idx = 0; | |
2217 _end_idx = _n->outcnt(); | |
2218 _dep_next = dg.dep(_n)->out_head(); | |
2219 } else if (_n->is_Mem() || _n->is_Phi() && _n->bottom_type() == Type::MEMORY) { | |
2220 _next_idx = 0; | |
2221 _end_idx = 0; | |
2222 _dep_next = dg.dep(_n)->out_head(); | |
2223 } else { | |
2224 _next_idx = 0; | |
2225 _end_idx = _n->outcnt(); | |
2226 _dep_next = NULL; | |
2227 } | |
2228 next(); | |
2229 } | |
2230 | |
2231 //-------------------------------next--------------------------- | |
2232 void DepSuccs::next() { | |
2233 if (_dep_next != NULL) { | |
2234 _current = _dep_next->succ()->node(); | |
2235 _dep_next = _dep_next->next_out(); | |
2236 } else if (_next_idx < _end_idx) { | |
2237 _current = _n->raw_out(_next_idx++); | |
2238 } else { | |
2239 _done = true; | |
2240 } | |
2241 } |