1 /*
2 * Copyright (c) 2007, 2022, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 #include "precompiled.hpp"
25 #include "compiler/compileLog.hpp"
26 #include "libadt/vectset.hpp"
27 #include "memory/allocation.inline.hpp"
28 #include "memory/resourceArea.hpp"
29 #include "opto/addnode.hpp"
30 #include "opto/callnode.hpp"
31 #include "opto/castnode.hpp"
32 #include "opto/convertnode.hpp"
33 #include "opto/divnode.hpp"
34 #include "opto/matcher.hpp"
35 #include "opto/memnode.hpp"
36 #include "opto/mulnode.hpp"
37 #include "opto/opcodes.hpp"
38 #include "opto/opaquenode.hpp"
39 #include "opto/superword.hpp"
40 #include "opto/vectornode.hpp"
41 #include "opto/movenode.hpp"
42 #include "utilities/powerOfTwo.hpp"
43
44 //
45 // S U P E R W O R D T R A N S F O R M
46 //=============================================================================
47
48 //------------------------------SuperWord---------------------------
49 SuperWord::SuperWord(PhaseIdealLoop* phase) :
50 _phase(phase),
51 _arena(phase->C->comp_arena()),
52 _igvn(phase->_igvn),
53 _packset(arena(), 8, 0, NULL), // packs for the current block
54 _bb_idx(arena(), (int)(1.10 * phase->C->unique()), 0, 0), // node idx to index in bb
55 _block(arena(), 8, 0, NULL), // nodes in current block
56 _post_block(arena(), 8, 0, NULL), // nodes common to current block which are marked as post loop vectorizable
57 _data_entry(arena(), 8, 0, NULL), // nodes with all inputs from outside
58 _mem_slice_head(arena(), 8, 0, NULL), // memory slice heads
59 _mem_slice_tail(arena(), 8, 0, NULL), // memory slice tails
60 _node_info(arena(), 8, 0, SWNodeInfo::initial), // info needed per node
61 _clone_map(phase->C->clone_map()), // map of nodes created in cloning
62 _cmovev_kit(_arena, this), // map to facilitate CMoveV creation
63 _align_to_ref(NULL), // memory reference to align vectors to
64 _disjoint_ptrs(arena(), 8, 0, OrderedPair::initial), // runtime disambiguated pointer pairs
65 _dg(_arena), // dependence graph
66 _visited(arena()), // visited node set
67 _post_visited(arena()), // post visited node set
68 _n_idx_list(arena(), 8), // scratch list of (node,index) pairs
69 _nlist(arena(), 8, 0, NULL), // scratch list of nodes
70 _stk(arena(), 8, 0, NULL), // scratch stack of nodes
71 _lpt(NULL), // loop tree node
72 _lp(NULL), // CountedLoopNode
73 _pre_loop_end(NULL), // Pre loop CountedLoopEndNode
74 _bb(NULL), // basic block
75 _iv(NULL), // induction var
76 _race_possible(false), // cases where SDMU is true
77 _early_return(true), // analysis evaluations routine
78 _do_vector_loop(phase->C->do_vector_loop()), // whether to do vectorization/simd style
79 _do_reserve_copy(DoReserveCopyInSuperWord),
80 _num_work_vecs(0), // amount of vector work we have
81 _num_reductions(0), // amount of reduction work we have
82 _ii_first(-1), // first loop generation index - only if do_vector_loop()
83 _ii_last(-1), // last loop generation index - only if do_vector_loop()
84 _ii_order(arena(), 8, 0, 0)
85 {
86 #ifndef PRODUCT
87 _vector_loop_debug = 0;
88 if (_phase->C->method() != NULL) {
89 _vector_loop_debug = phase->C->directive()->VectorizeDebugOption;
90 }
91
92 #endif
93 }
94
95 static const bool _do_vector_loop_experimental = false; // Experimental vectorization which uses data from loop unrolling.
96
97 //------------------------------transform_loop---------------------------
98 bool SuperWord::transform_loop(IdealLoopTree* lpt, bool do_optimization) {
99 assert(UseSuperWord, "should be");
100 // SuperWord only works with power of two vector sizes.
101 int vector_width = Matcher::vector_width_in_bytes(T_BYTE);
102 if (vector_width < 2 || !is_power_of_2(vector_width)) {
103 return false;
104 }
105
106 assert(lpt->_head->is_CountedLoop(), "must be");
107 CountedLoopNode *cl = lpt->_head->as_CountedLoop();
108
109 if (!cl->is_valid_counted_loop(T_INT)) {
110 return false; // skip malformed counted loop
111 }
112
113 if (cl->is_rce_post_loop() && cl->is_reduction_loop()) {
114 // Post loop vectorization doesn't support reductions
115 return false;
116 }
117
118 // skip any loop that has not been assigned max unroll by analysis
119 if (do_optimization) {
120 if (SuperWordLoopUnrollAnalysis && cl->slp_max_unroll() == 0) {
121 return false;
122 }
123 }
124
125 // Check for no control flow in body (other than exit)
126 Node *cl_exit = cl->loopexit();
127 if (cl->is_main_loop() && (cl_exit->in(0) != lpt->_head)) {
128 #ifndef PRODUCT
129 if (TraceSuperWord) {
130 tty->print_cr("SuperWord::transform_loop: loop too complicated, cl_exit->in(0) != lpt->_head");
131 tty->print("cl_exit %d", cl_exit->_idx); cl_exit->dump();
132 tty->print("cl_exit->in(0) %d", cl_exit->in(0)->_idx); cl_exit->in(0)->dump();
133 tty->print("lpt->_head %d", lpt->_head->_idx); lpt->_head->dump();
134 lpt->dump_head();
135 }
136 #endif
137 return false;
138 }
139
140 // Make sure the are no extra control users of the loop backedge
141 if (cl->back_control()->outcnt() != 1) {
142 return false;
143 }
144
145 // Skip any loops already optimized by slp
146 if (cl->is_vectorized_loop()) {
147 return false;
148 }
149
150 if (cl->is_unroll_only()) {
151 return false;
152 }
153
154 if (cl->is_main_loop()) {
155 // Check for pre-loop ending with CountedLoopEnd(Bool(Cmp(x,Opaque1(limit))))
156 CountedLoopEndNode* pre_end = find_pre_loop_end(cl);
157 if (pre_end == NULL) {
158 return false;
159 }
160 Node* pre_opaq1 = pre_end->limit();
161 if (pre_opaq1->Opcode() != Op_Opaque1) {
162 return false;
163 }
164 set_pre_loop_end(pre_end);
165 }
166
167 init(); // initialize data structures
168
169 set_lpt(lpt);
170 set_lp(cl);
171
172 // For now, define one block which is the entire loop body
173 set_bb(cl);
174
175 bool success = true;
176 if (do_optimization) {
177 assert(_packset.length() == 0, "packset must be empty");
178 success = SLP_extract();
179 if (PostLoopMultiversioning) {
180 if (cl->is_vectorized_loop() && cl->is_main_loop() && !cl->is_reduction_loop()) {
181 IdealLoopTree *lpt_next = cl->is_strip_mined() ? lpt->_parent->_next : lpt->_next;
182 CountedLoopNode *cl_next = lpt_next->_head->as_CountedLoop();
183 _phase->has_range_checks(lpt_next);
184 // Main loop SLP works well for manually unrolled loops. But post loop
185 // vectorization doesn't work for these. To bail out the optimization
186 // earlier, we have range check and loop stride conditions below.
187 if (cl_next->is_post_loop() && !cl_next->range_checks_present() &&
188 cl_next->stride_is_con() && abs(cl_next->stride_con()) == 1) {
189 if (!cl_next->is_vectorized_loop()) {
190 // Propagate some main loop attributes to its corresponding scalar
191 // rce'd post loop for vectorization with vector masks
192 cl_next->set_slp_max_unroll(cl->slp_max_unroll());
193 cl_next->set_slp_pack_count(cl->slp_pack_count());
194 }
195 }
196 }
197 }
198 }
199 return success;
200 }
201
202 //------------------------------early unrolling analysis------------------------------
203 void SuperWord::unrolling_analysis(int &local_loop_unroll_factor) {
204 bool is_slp = true;
205 ResourceMark rm;
206 size_t ignored_size = lpt()->_body.size();
207 int *ignored_loop_nodes = NEW_RESOURCE_ARRAY(int, ignored_size);
208 Node_Stack nstack((int)ignored_size);
209 CountedLoopNode *cl = lpt()->_head->as_CountedLoop();
210 Node *cl_exit = cl->loopexit_or_null();
211 int rpo_idx = _post_block.length();
212
213 assert(rpo_idx == 0, "post loop block is empty");
214
215 // First clear the entries
216 for (uint i = 0; i < lpt()->_body.size(); i++) {
217 ignored_loop_nodes[i] = -1;
218 }
219
220 int max_vector = Matcher::max_vector_size(T_BYTE);
221
222 // Process the loop, some/all of the stack entries will not be in order, ergo
223 // need to preprocess the ignored initial state before we process the loop
224 for (uint i = 0; i < lpt()->_body.size(); i++) {
225 Node* n = lpt()->_body.at(i);
226 if (n == cl->incr() ||
227 n->is_reduction() ||
228 n->is_AddP() ||
229 n->is_Cmp() ||
230 n->is_Bool() ||
231 n->is_IfTrue() ||
232 n->is_CountedLoop() ||
233 (n == cl_exit)) {
234 ignored_loop_nodes[i] = n->_idx;
235 continue;
236 }
237
238 if (n->is_If()) {
239 IfNode *iff = n->as_If();
240 if (iff->_fcnt != COUNT_UNKNOWN && iff->_prob != PROB_UNKNOWN) {
241 if (lpt()->is_loop_exit(iff)) {
242 ignored_loop_nodes[i] = n->_idx;
243 continue;
244 }
245 }
246 }
247
248 if (n->is_Phi() && (n->bottom_type() == Type::MEMORY)) {
249 Node* n_tail = n->in(LoopNode::LoopBackControl);
250 if (n_tail != n->in(LoopNode::EntryControl)) {
251 if (!n_tail->is_Mem()) {
252 is_slp = false;
253 break;
254 }
255 }
256 }
257
258 // This must happen after check of phi/if
259 if (n->is_Phi() || n->is_If()) {
260 ignored_loop_nodes[i] = n->_idx;
261 continue;
262 }
263
264 if (n->is_LoadStore() || n->is_MergeMem() ||
265 (n->is_Proj() && !n->as_Proj()->is_CFG())) {
266 is_slp = false;
267 break;
268 }
269
270 // Ignore nodes with non-primitive type.
271 BasicType bt;
272 if (n->is_Mem()) {
273 bt = n->as_Mem()->memory_type();
274 } else {
275 bt = n->bottom_type()->basic_type();
276 }
277 if (is_java_primitive(bt) == false) {
278 ignored_loop_nodes[i] = n->_idx;
279 continue;
280 }
281
282 if (n->is_Mem()) {
283 MemNode* current = n->as_Mem();
284 Node* adr = n->in(MemNode::Address);
285 Node* n_ctrl = _phase->get_ctrl(adr);
286
287 // save a queue of post process nodes
288 if (n_ctrl != NULL && lpt()->is_member(_phase->get_loop(n_ctrl))) {
289 // Process the memory expression
290 int stack_idx = 0;
291 bool have_side_effects = true;
292 if (adr->is_AddP() == false) {
293 nstack.push(adr, stack_idx++);
294 } else {
295 // Mark the components of the memory operation in nstack
296 SWPointer p1(current, this, &nstack, true);
297 have_side_effects = p1.node_stack()->is_nonempty();
298 }
299
300 // Process the pointer stack
301 while (have_side_effects) {
302 Node* pointer_node = nstack.node();
303 for (uint j = 0; j < lpt()->_body.size(); j++) {
304 Node* cur_node = lpt()->_body.at(j);
305 if (cur_node == pointer_node) {
306 ignored_loop_nodes[j] = cur_node->_idx;
307 break;
308 }
309 }
310 nstack.pop();
311 have_side_effects = nstack.is_nonempty();
312 }
313 }
314 }
315 }
316
317 if (is_slp) {
318 // In the main loop, SLP works well if parts of the operations in the loop body
319 // are not vectorizable and those non-vectorizable parts will be unrolled only.
320 // But in post loops with vector masks, we create singleton packs directly from
321 // scalars so all operations should be vectorized together. This compares the
322 // number of packs in the post loop with the main loop and bail out if the post
323 // loop potentially has more packs.
324 if (cl->is_rce_post_loop()) {
325 for (uint i = 0; i < lpt()->_body.size(); i++) {
326 if (ignored_loop_nodes[i] == -1) {
327 _post_block.at_put_grow(rpo_idx++, lpt()->_body.at(i));
328 }
329 }
330 if (_post_block.length() > cl->slp_pack_count()) {
331 // Clear local_loop_unroll_factor and bail out directly from here
332 local_loop_unroll_factor = 0;
333 cl->mark_was_slp();
334 cl->set_slp_max_unroll(0);
335 return;
336 }
337 }
338
339 // Now we try to find the maximum supported consistent vector which the machine
340 // description can use
341 bool flag_small_bt = false;
342 for (uint i = 0; i < lpt()->_body.size(); i++) {
343 if (ignored_loop_nodes[i] != -1) continue;
344
345 BasicType bt;
346 Node* n = lpt()->_body.at(i);
347 if (n->is_Mem()) {
348 bt = n->as_Mem()->memory_type();
349 } else {
350 bt = n->bottom_type()->basic_type();
351 }
352
353 if (is_java_primitive(bt) == false) continue;
354
355 int cur_max_vector = Matcher::max_vector_size(bt);
356
357 // If a max vector exists which is not larger than _local_loop_unroll_factor
358 // stop looking, we already have the max vector to map to.
359 if (cur_max_vector < local_loop_unroll_factor) {
360 is_slp = false;
361 if (TraceSuperWordLoopUnrollAnalysis) {
362 tty->print_cr("slp analysis fails: unroll limit greater than max vector\n");
363 }
364 break;
365 }
366
367 // Map the maximal common vector
368 if (VectorNode::implemented(n->Opcode(), cur_max_vector, bt)) {
369 if (cur_max_vector < max_vector && !flag_small_bt) {
370 max_vector = cur_max_vector;
371 } else if (cur_max_vector > max_vector && UseSubwordForMaxVector) {
372 // Analyse subword in the loop to set maximum vector size to take advantage of full vector width for subword types.
373 // Here we analyze if narrowing is likely to happen and if it is we set vector size more aggressively.
374 // We check for possibility of narrowing by looking through chain operations using subword types.
375 if (is_subword_type(bt)) {
376 uint start, end;
377 VectorNode::vector_operands(n, &start, &end);
378
379 for (uint j = start; j < end; j++) {
380 Node* in = n->in(j);
381 // Don't propagate through a memory
382 if (!in->is_Mem() && in_bb(in) && in->bottom_type()->basic_type() == T_INT) {
383 bool same_type = true;
384 for (DUIterator_Fast kmax, k = in->fast_outs(kmax); k < kmax; k++) {
385 Node *use = in->fast_out(k);
386 if (!in_bb(use) && use->bottom_type()->basic_type() != bt) {
387 same_type = false;
388 break;
389 }
390 }
391 if (same_type) {
392 max_vector = cur_max_vector;
393 flag_small_bt = true;
394 cl->mark_subword_loop();
395 }
396 }
397 }
398 }
399 }
400 }
401 }
402 if (is_slp) {
403 local_loop_unroll_factor = max_vector;
404 cl->mark_passed_slp();
405 }
406 cl->mark_was_slp();
407 cl->set_slp_max_unroll(local_loop_unroll_factor);
408 }
409 }
410
411 //------------------------------SLP_extract---------------------------
412 // Extract the superword level parallelism
413 //
414 // 1) A reverse post-order of nodes in the block is constructed. By scanning
415 // this list from first to last, all definitions are visited before their uses.
416 //
417 // 2) A point-to-point dependence graph is constructed between memory references.
418 // This simplifies the upcoming "independence" checker.
419 //
420 // 3) The maximum depth in the node graph from the beginning of the block
421 // to each node is computed. This is used to prune the graph search
422 // in the independence checker.
423 //
424 // 4) For integer types, the necessary bit width is propagated backwards
425 // from stores to allow packed operations on byte, char, and short
426 // integers. This reverses the promotion to type "int" that javac
427 // did for operations like: char c1,c2,c3; c1 = c2 + c3.
428 //
429 // 5) One of the memory references is picked to be an aligned vector reference.
430 // The pre-loop trip count is adjusted to align this reference in the
431 // unrolled body.
432 //
433 // 6) The initial set of pack pairs is seeded with memory references.
434 //
435 // 7) The set of pack pairs is extended by following use->def and def->use links.
436 //
437 // 8) The pairs are combined into vector sized packs.
438 //
439 // 9) Reorder the memory slices to co-locate members of the memory packs.
440 //
441 // 10) Generate ideal vector nodes for the final set of packs and where necessary,
442 // inserting scalar promotion, vector creation from multiple scalars, and
443 // extraction of scalar values from vectors.
444 //
445 bool SuperWord::SLP_extract() {
446
447 #ifndef PRODUCT
448 if (_do_vector_loop && TraceSuperWord) {
449 tty->print("SuperWord::SLP_extract\n");
450 tty->print("input loop\n");
451 _lpt->dump_head();
452 _lpt->dump();
453 for (uint i = 0; i < _lpt->_body.size(); i++) {
454 _lpt->_body.at(i)->dump();
455 }
456 }
457 #endif
458 // Ready the block
459 if (!construct_bb()) {
460 return false; // Exit if no interesting nodes or complex graph.
461 }
462
463 // build _dg, _disjoint_ptrs
464 dependence_graph();
465
466 // compute function depth(Node*)
467 compute_max_depth();
468
469 CountedLoopNode *cl = lpt()->_head->as_CountedLoop();
470 if (cl->is_main_loop()) {
471 if (_do_vector_loop_experimental) {
472 if (mark_generations() != -1) {
473 hoist_loads_in_graph(); // this only rebuild the graph; all basic structs need rebuild explicitly
474
475 if (!construct_bb()) {
476 return false; // Exit if no interesting nodes or complex graph.
477 }
478 dependence_graph();
479 compute_max_depth();
480 }
481
482 #ifndef PRODUCT
483 if (TraceSuperWord) {
484 tty->print_cr("\nSuperWord::_do_vector_loop: graph after hoist_loads_in_graph");
485 _lpt->dump_head();
486 for (int j = 0; j < _block.length(); j++) {
487 Node* n = _block.at(j);
488 int d = depth(n);
489 for (int i = 0; i < d; i++) tty->print("%s", " ");
490 tty->print("%d :", d);
491 n->dump();
492 }
493 }
494 #endif
495 }
496
497 compute_vector_element_type();
498
499 // Attempt vectorization
500
501 find_adjacent_refs();
502
503 if (align_to_ref() == NULL) {
504 return false; // Did not find memory reference to align vectors
505 }
506
507 extend_packlist();
508
509 if (_do_vector_loop_experimental) {
510 if (_packset.length() == 0) {
511 #ifndef PRODUCT
512 if (TraceSuperWord) {
513 tty->print_cr("\nSuperWord::_do_vector_loop DFA could not build packset, now trying to build anyway");
514 }
515 #endif
516 pack_parallel();
517 }
518 }
519
520 combine_packs();
521
522 construct_my_pack_map();
523 if (UseVectorCmov) {
524 merge_packs_to_cmovd();
525 }
526
527 filter_packs();
528
529 schedule();
530
531 // Record eventual count of vector packs for checks in post loop vectorization
532 if (PostLoopMultiversioning) {
533 cl->set_slp_pack_count(_packset.length());
534 }
535 } else {
536 assert(cl->is_rce_post_loop(), "Must be an rce'd post loop");
537 int saved_mapped_unroll_factor = cl->slp_max_unroll();
538 if (saved_mapped_unroll_factor) {
539 int vector_mapped_unroll_factor = saved_mapped_unroll_factor;
540
541 // now reset the slp_unroll_factor so that we can check the analysis mapped
542 // what the vector loop was mapped to
543 cl->set_slp_max_unroll(0);
544
545 // do the analysis on the post loop
546 unrolling_analysis(vector_mapped_unroll_factor);
547
548 // if our analyzed loop is a canonical fit, start processing it
549 if (vector_mapped_unroll_factor == saved_mapped_unroll_factor) {
550 // now add the vector nodes to packsets
551 for (int i = 0; i < _post_block.length(); i++) {
552 Node* n = _post_block.at(i);
553 Node_List* singleton = new Node_List();
554 singleton->push(n);
555 _packset.append(singleton);
556 set_my_pack(n, singleton);
557 }
558
559 // map base types for vector usage
560 compute_vector_element_type();
561 } else {
562 return false;
563 }
564 } else {
565 // for some reason we could not map the slp analysis state of the vectorized loop
566 return false;
567 }
568 }
569
570 return output();
571 }
572
573 //------------------------------find_adjacent_refs---------------------------
574 // Find the adjacent memory references and create pack pairs for them.
575 // This is the initial set of packs that will then be extended by
576 // following use->def and def->use links. The align positions are
577 // assigned relative to the reference "align_to_ref"
578 void SuperWord::find_adjacent_refs() {
579 // Get list of memory operations
580 Node_List memops;
581 for (int i = 0; i < _block.length(); i++) {
582 Node* n = _block.at(i);
583 if (n->is_Mem() && !n->is_LoadStore() && in_bb(n) &&
584 is_java_primitive(n->as_Mem()->memory_type())) {
585 int align = memory_alignment(n->as_Mem(), 0);
586 if (align != bottom_align) {
587 memops.push(n);
588 }
589 }
590 }
591 if (TraceSuperWord) {
592 tty->print_cr("\nfind_adjacent_refs found %d memops", memops.size());
593 }
594
595 Node_List align_to_refs;
596 int max_idx;
597 int best_iv_adjustment = 0;
598 MemNode* best_align_to_mem_ref = NULL;
599
600 while (memops.size() != 0) {
601 // Find a memory reference to align to.
602 MemNode* mem_ref = find_align_to_ref(memops, max_idx);
603 if (mem_ref == NULL) break;
604 align_to_refs.push(mem_ref);
605 int iv_adjustment = get_iv_adjustment(mem_ref);
606
607 if (best_align_to_mem_ref == NULL) {
608 // Set memory reference which is the best from all memory operations
609 // to be used for alignment. The pre-loop trip count is modified to align
610 // this reference to a vector-aligned address.
611 best_align_to_mem_ref = mem_ref;
612 best_iv_adjustment = iv_adjustment;
613 NOT_PRODUCT(find_adjacent_refs_trace_1(best_align_to_mem_ref, best_iv_adjustment);)
614 }
615
616 SWPointer align_to_ref_p(mem_ref, this, NULL, false);
617 // Set alignment relative to "align_to_ref" for all related memory operations.
618 for (int i = memops.size() - 1; i >= 0; i--) {
619 MemNode* s = memops.at(i)->as_Mem();
620 if (isomorphic(s, mem_ref) &&
621 (!_do_vector_loop || same_origin_idx(s, mem_ref))) {
622 SWPointer p2(s, this, NULL, false);
623 if (p2.comparable(align_to_ref_p)) {
624 int align = memory_alignment(s, iv_adjustment);
625 set_alignment(s, align);
626 }
627 }
628 }
629
630 // Create initial pack pairs of memory operations for which
631 // alignment is set and vectors will be aligned.
632 bool create_pack = true;
633 if (memory_alignment(mem_ref, best_iv_adjustment) == 0 || _do_vector_loop) {
634 if (vectors_should_be_aligned()) {
635 int vw = vector_width(mem_ref);
636 int vw_best = vector_width(best_align_to_mem_ref);
637 if (vw > vw_best) {
638 // Do not vectorize a memory access with more elements per vector
639 // if unaligned memory access is not allowed because number of
640 // iterations in pre-loop will be not enough to align it.
641 create_pack = false;
642 } else {
643 SWPointer p2(best_align_to_mem_ref, this, NULL, false);
644 if (!align_to_ref_p.invar_equals(p2)) {
645 // Do not vectorize memory accesses with different invariants
646 // if unaligned memory accesses are not allowed.
647 create_pack = false;
648 }
649 }
650 }
651 } else {
652 if (same_velt_type(mem_ref, best_align_to_mem_ref)) {
653 // Can't allow vectorization of unaligned memory accesses with the
654 // same type since it could be overlapped accesses to the same array.
655 create_pack = false;
656 } else {
657 // Allow independent (different type) unaligned memory operations
658 // if HW supports them.
659 if (vectors_should_be_aligned()) {
660 create_pack = false;
661 } else {
662 // Check if packs of the same memory type but
663 // with a different alignment were created before.
664 for (uint i = 0; i < align_to_refs.size(); i++) {
665 MemNode* mr = align_to_refs.at(i)->as_Mem();
666 if (mr == mem_ref) {
667 // Skip when we are looking at same memory operation.
668 continue;
669 }
670 if (same_velt_type(mr, mem_ref) &&
671 memory_alignment(mr, iv_adjustment) != 0)
672 create_pack = false;
673 }
674 }
675 }
676 }
677 if (create_pack) {
678 for (uint i = 0; i < memops.size(); i++) {
679 Node* s1 = memops.at(i);
680 int align = alignment(s1);
681 if (align == top_align) continue;
682 for (uint j = 0; j < memops.size(); j++) {
683 Node* s2 = memops.at(j);
684 if (alignment(s2) == top_align) continue;
685 if (s1 != s2 && are_adjacent_refs(s1, s2)) {
686 if (stmts_can_pack(s1, s2, align)) {
687 Node_List* pair = new Node_List();
688 pair->push(s1);
689 pair->push(s2);
690 if (!_do_vector_loop || same_origin_idx(s1, s2)) {
691 _packset.append(pair);
692 }
693 }
694 }
695 }
696 }
697 } else { // Don't create unaligned pack
698 // First, remove remaining memory ops of the same type from the list.
699 for (int i = memops.size() - 1; i >= 0; i--) {
700 MemNode* s = memops.at(i)->as_Mem();
701 if (same_velt_type(s, mem_ref)) {
702 memops.remove(i);
703 }
704 }
705
706 // Second, remove already constructed packs of the same type.
707 for (int i = _packset.length() - 1; i >= 0; i--) {
708 Node_List* p = _packset.at(i);
709 MemNode* s = p->at(0)->as_Mem();
710 if (same_velt_type(s, mem_ref)) {
711 remove_pack_at(i);
712 }
713 }
714
715 // If needed find the best memory reference for loop alignment again.
716 if (same_velt_type(mem_ref, best_align_to_mem_ref)) {
717 // Put memory ops from remaining packs back on memops list for
718 // the best alignment search.
719 uint orig_msize = memops.size();
720 for (int i = 0; i < _packset.length(); i++) {
721 Node_List* p = _packset.at(i);
722 MemNode* s = p->at(0)->as_Mem();
723 assert(!same_velt_type(s, mem_ref), "sanity");
724 memops.push(s);
725 }
726 best_align_to_mem_ref = find_align_to_ref(memops, max_idx);
727 if (best_align_to_mem_ref == NULL) {
728 if (TraceSuperWord) {
729 tty->print_cr("SuperWord::find_adjacent_refs(): best_align_to_mem_ref == NULL");
730 }
731 // best_align_to_mem_ref will be used for adjusting the pre-loop limit in
732 // SuperWord::align_initial_loop_index. Find one with the biggest vector size,
733 // smallest data size and smallest iv offset from memory ops from remaining packs.
734 if (_packset.length() > 0) {
735 if (orig_msize == 0) {
736 best_align_to_mem_ref = memops.at(max_idx)->as_Mem();
737 } else {
738 for (uint i = 0; i < orig_msize; i++) {
739 memops.remove(0);
740 }
741 best_align_to_mem_ref = find_align_to_ref(memops, max_idx);
742 assert(best_align_to_mem_ref == NULL, "sanity");
743 best_align_to_mem_ref = memops.at(max_idx)->as_Mem();
744 }
745 assert(best_align_to_mem_ref != NULL, "sanity");
746 }
747 break;
748 }
749 best_iv_adjustment = get_iv_adjustment(best_align_to_mem_ref);
750 NOT_PRODUCT(find_adjacent_refs_trace_1(best_align_to_mem_ref, best_iv_adjustment);)
751 // Restore list.
752 while (memops.size() > orig_msize)
753 (void)memops.pop();
754 }
755 } // unaligned memory accesses
756
757 // Remove used mem nodes.
758 for (int i = memops.size() - 1; i >= 0; i--) {
759 MemNode* m = memops.at(i)->as_Mem();
760 if (alignment(m) != top_align) {
761 memops.remove(i);
762 }
763 }
764
765 } // while (memops.size() != 0
766 set_align_to_ref(best_align_to_mem_ref);
767
768 if (TraceSuperWord) {
769 tty->print_cr("\nAfter find_adjacent_refs");
770 print_packset();
771 }
772 }
773
774 #ifndef PRODUCT
775 void SuperWord::find_adjacent_refs_trace_1(Node* best_align_to_mem_ref, int best_iv_adjustment) {
776 if (is_trace_adjacent()) {
777 tty->print("SuperWord::find_adjacent_refs best_align_to_mem_ref = %d, best_iv_adjustment = %d",
778 best_align_to_mem_ref->_idx, best_iv_adjustment);
779 best_align_to_mem_ref->dump();
780 }
781 }
782 #endif
783
784 //------------------------------find_align_to_ref---------------------------
785 // Find a memory reference to align the loop induction variable to.
786 // Looks first at stores then at loads, looking for a memory reference
787 // with the largest number of references similar to it.
788 MemNode* SuperWord::find_align_to_ref(Node_List &memops, int &idx) {
789 GrowableArray<int> cmp_ct(arena(), memops.size(), memops.size(), 0);
790
791 // Count number of comparable memory ops
792 for (uint i = 0; i < memops.size(); i++) {
793 MemNode* s1 = memops.at(i)->as_Mem();
794 SWPointer p1(s1, this, NULL, false);
795 // Only discard unalignable memory references if vector memory references
796 // should be aligned on this platform.
797 if (vectors_should_be_aligned() && !ref_is_alignable(p1)) {
798 *cmp_ct.adr_at(i) = 0;
799 continue;
800 }
801 for (uint j = i+1; j < memops.size(); j++) {
802 MemNode* s2 = memops.at(j)->as_Mem();
803 if (isomorphic(s1, s2)) {
804 SWPointer p2(s2, this, NULL, false);
805 if (p1.comparable(p2)) {
806 (*cmp_ct.adr_at(i))++;
807 (*cmp_ct.adr_at(j))++;
808 }
809 }
810 }
811 }
812
813 // Find Store (or Load) with the greatest number of "comparable" references,
814 // biggest vector size, smallest data size and smallest iv offset.
815 int max_ct = 0;
816 int max_vw = 0;
817 int max_idx = -1;
818 int min_size = max_jint;
819 int min_iv_offset = max_jint;
820 for (uint j = 0; j < memops.size(); j++) {
821 MemNode* s = memops.at(j)->as_Mem();
822 if (s->is_Store()) {
823 int vw = vector_width_in_bytes(s);
824 assert(vw > 1, "sanity");
825 SWPointer p(s, this, NULL, false);
826 if ( cmp_ct.at(j) > max_ct ||
827 (cmp_ct.at(j) == max_ct &&
828 ( vw > max_vw ||
829 (vw == max_vw &&
830 ( data_size(s) < min_size ||
831 (data_size(s) == min_size &&
832 p.offset_in_bytes() < min_iv_offset)))))) {
833 max_ct = cmp_ct.at(j);
834 max_vw = vw;
835 max_idx = j;
836 min_size = data_size(s);
837 min_iv_offset = p.offset_in_bytes();
838 }
839 }
840 }
841 // If no stores, look at loads
842 if (max_ct == 0) {
843 for (uint j = 0; j < memops.size(); j++) {
844 MemNode* s = memops.at(j)->as_Mem();
845 if (s->is_Load()) {
846 int vw = vector_width_in_bytes(s);
847 assert(vw > 1, "sanity");
848 SWPointer p(s, this, NULL, false);
849 if ( cmp_ct.at(j) > max_ct ||
850 (cmp_ct.at(j) == max_ct &&
851 ( vw > max_vw ||
852 (vw == max_vw &&
853 ( data_size(s) < min_size ||
854 (data_size(s) == min_size &&
855 p.offset_in_bytes() < min_iv_offset)))))) {
856 max_ct = cmp_ct.at(j);
857 max_vw = vw;
858 max_idx = j;
859 min_size = data_size(s);
860 min_iv_offset = p.offset_in_bytes();
861 }
862 }
863 }
864 }
865
866 #ifdef ASSERT
867 if (TraceSuperWord && Verbose) {
868 tty->print_cr("\nVector memops after find_align_to_ref");
869 for (uint i = 0; i < memops.size(); i++) {
870 MemNode* s = memops.at(i)->as_Mem();
871 s->dump();
872 }
873 }
874 #endif
875
876 idx = max_idx;
877 if (max_ct > 0) {
878 #ifdef ASSERT
879 if (TraceSuperWord) {
880 tty->print("\nVector align to node: ");
881 memops.at(max_idx)->as_Mem()->dump();
882 }
883 #endif
884 return memops.at(max_idx)->as_Mem();
885 }
886 return NULL;
887 }
888
889 //------------------span_works_for_memory_size-----------------------------
890 static bool span_works_for_memory_size(MemNode* mem, int span, int mem_size, int offset) {
891 bool span_matches_memory = false;
892 if ((mem_size == type2aelembytes(T_BYTE) || mem_size == type2aelembytes(T_SHORT))
893 && ABS(span) == type2aelembytes(T_INT)) {
894 // There is a mismatch on span size compared to memory.
895 for (DUIterator_Fast jmax, j = mem->fast_outs(jmax); j < jmax; j++) {
896 Node* use = mem->fast_out(j);
897 if (!VectorNode::is_type_transition_to_int(use)) {
898 return false;
899 }
900 }
901 // If all uses transition to integer, it means that we can successfully align even on mismatch.
902 return true;
903 }
904 else {
905 span_matches_memory = ABS(span) == mem_size;
906 }
907 return span_matches_memory && (ABS(offset) % mem_size) == 0;
908 }
909
910 //------------------------------ref_is_alignable---------------------------
911 // Can the preloop align the reference to position zero in the vector?
912 bool SuperWord::ref_is_alignable(SWPointer& p) {
913 if (!p.has_iv()) {
914 return true; // no induction variable
915 }
916 CountedLoopEndNode* pre_end = pre_loop_end();
917 assert(pre_end->stride_is_con(), "pre loop stride is constant");
918 int preloop_stride = pre_end->stride_con();
919
920 int span = preloop_stride * p.scale_in_bytes();
921 int mem_size = p.memory_size();
922 int offset = p.offset_in_bytes();
923 // Stride one accesses are alignable if offset is aligned to memory operation size.
924 // Offset can be unaligned when UseUnalignedAccesses is used.
925 if (span_works_for_memory_size(p.mem(), span, mem_size, offset)) {
926 return true;
927 }
928 // If the initial offset from start of the object is computable,
929 // check if the pre-loop can align the final offset accordingly.
930 //
931 // In other words: Can we find an i such that the offset
932 // after i pre-loop iterations is aligned to vw?
933 // (init_offset + pre_loop) % vw == 0 (1)
934 // where
935 // pre_loop = i * span
936 // is the number of bytes added to the offset by i pre-loop iterations.
937 //
938 // For this to hold we need pre_loop to increase init_offset by
939 // pre_loop = vw - (init_offset % vw)
940 //
941 // This is only possible if pre_loop is divisible by span because each
942 // pre-loop iteration increases the initial offset by 'span' bytes:
943 // (vw - (init_offset % vw)) % span == 0
944 //
945 int vw = vector_width_in_bytes(p.mem());
946 assert(vw > 1, "sanity");
947 Node* init_nd = pre_end->init_trip();
948 if (init_nd->is_Con() && p.invar() == NULL) {
949 int init = init_nd->bottom_type()->is_int()->get_con();
950 int init_offset = init * p.scale_in_bytes() + offset;
951 if (init_offset < 0) { // negative offset from object start?
952 return false; // may happen in dead loop
953 }
954 if (vw % span == 0) {
955 // If vm is a multiple of span, we use formula (1).
956 if (span > 0) {
957 return (vw - (init_offset % vw)) % span == 0;
958 } else {
959 assert(span < 0, "nonzero stride * scale");
960 return (init_offset % vw) % -span == 0;
961 }
962 } else if (span % vw == 0) {
963 // If span is a multiple of vw, we can simplify formula (1) to:
964 // (init_offset + i * span) % vw == 0
965 // =>
966 // (init_offset % vw) + ((i * span) % vw) == 0
967 // =>
968 // init_offset % vw == 0
969 //
970 // Because we add a multiple of vw to the initial offset, the final
971 // offset is a multiple of vw if and only if init_offset is a multiple.
972 //
973 return (init_offset % vw) == 0;
974 }
975 }
976 return false;
977 }
978 //---------------------------get_vw_bytes_special------------------------
979 int SuperWord::get_vw_bytes_special(MemNode* s) {
980 // Get the vector width in bytes.
981 int vw = vector_width_in_bytes(s);
982
983 // Check for special case where there is an MulAddS2I usage where short vectors are going to need combined.
984 BasicType btype = velt_basic_type(s);
985 if (type2aelembytes(btype) == 2) {
986 bool should_combine_adjacent = true;
987 for (DUIterator_Fast imax, i = s->fast_outs(imax); i < imax; i++) {
988 Node* user = s->fast_out(i);
989 if (!VectorNode::is_muladds2i(user)) {
990 should_combine_adjacent = false;
991 }
992 }
993 if (should_combine_adjacent) {
994 vw = MIN2(Matcher::max_vector_size(btype)*type2aelembytes(btype), vw * 2);
995 }
996 }
997
998 return vw;
999 }
1000
1001 //---------------------------get_iv_adjustment---------------------------
1002 // Calculate loop's iv adjustment for this memory ops.
1003 int SuperWord::get_iv_adjustment(MemNode* mem_ref) {
1004 SWPointer align_to_ref_p(mem_ref, this, NULL, false);
1005 int offset = align_to_ref_p.offset_in_bytes();
1006 int scale = align_to_ref_p.scale_in_bytes();
1007 int elt_size = align_to_ref_p.memory_size();
1008 int vw = get_vw_bytes_special(mem_ref);
1009 assert(vw > 1, "sanity");
1010 int iv_adjustment;
1011 if (scale != 0) {
1012 int stride_sign = (scale * iv_stride()) > 0 ? 1 : -1;
1013 // At least one iteration is executed in pre-loop by default. As result
1014 // several iterations are needed to align memory operations in main-loop even
1015 // if offset is 0.
1016 int iv_adjustment_in_bytes = (stride_sign * vw - (offset % vw));
1017 // iv_adjustment_in_bytes must be a multiple of elt_size if vector memory
1018 // references should be aligned on this platform.
1019 assert((ABS(iv_adjustment_in_bytes) % elt_size) == 0 || !vectors_should_be_aligned(),
1020 "(%d) should be divisible by (%d)", iv_adjustment_in_bytes, elt_size);
1021 iv_adjustment = iv_adjustment_in_bytes/elt_size;
1022 } else {
1023 // This memory op is not dependent on iv (scale == 0)
1024 iv_adjustment = 0;
1025 }
1026
1027 #ifndef PRODUCT
1028 if (TraceSuperWord) {
1029 tty->print("SuperWord::get_iv_adjustment: n = %d, noffset = %d iv_adjust = %d elt_size = %d scale = %d iv_stride = %d vect_size %d: ",
1030 mem_ref->_idx, offset, iv_adjustment, elt_size, scale, iv_stride(), vw);
1031 mem_ref->dump();
1032 }
1033 #endif
1034 return iv_adjustment;
1035 }
1036
1037 //---------------------------dependence_graph---------------------------
1038 // Construct dependency graph.
1039 // Add dependence edges to load/store nodes for memory dependence
1040 // A.out()->DependNode.in(1) and DependNode.out()->B.prec(x)
1041 void SuperWord::dependence_graph() {
1042 CountedLoopNode *cl = lpt()->_head->as_CountedLoop();
1043 // First, assign a dependence node to each memory node
1044 for (int i = 0; i < _block.length(); i++ ) {
1045 Node *n = _block.at(i);
1046 if (n->is_Mem() || (n->is_Phi() && n->bottom_type() == Type::MEMORY)) {
1047 _dg.make_node(n);
1048 }
1049 }
1050
1051 // For each memory slice, create the dependences
1052 for (int i = 0; i < _mem_slice_head.length(); i++) {
1053 Node* n = _mem_slice_head.at(i);
1054 Node* n_tail = _mem_slice_tail.at(i);
1055
1056 // Get slice in predecessor order (last is first)
1057 if (cl->is_main_loop()) {
1058 mem_slice_preds(n_tail, n, _nlist);
1059 }
1060
1061 #ifndef PRODUCT
1062 if(TraceSuperWord && Verbose) {
1063 tty->print_cr("SuperWord::dependence_graph: built a new mem slice");
1064 for (int j = _nlist.length() - 1; j >= 0 ; j--) {
1065 _nlist.at(j)->dump();
1066 }
1067 }
1068 #endif
1069 // Make the slice dependent on the root
1070 DepMem* slice = _dg.dep(n);
1071 _dg.make_edge(_dg.root(), slice);
1072
1073 // Create a sink for the slice
1074 DepMem* slice_sink = _dg.make_node(NULL);
1075 _dg.make_edge(slice_sink, _dg.tail());
1076
1077 // Now visit each pair of memory ops, creating the edges
1078 for (int j = _nlist.length() - 1; j >= 0 ; j--) {
1079 Node* s1 = _nlist.at(j);
1080
1081 // If no dependency yet, use slice
1082 if (_dg.dep(s1)->in_cnt() == 0) {
1083 _dg.make_edge(slice, s1);
1084 }
1085 SWPointer p1(s1->as_Mem(), this, NULL, false);
1086 bool sink_dependent = true;
1087 for (int k = j - 1; k >= 0; k--) {
1088 Node* s2 = _nlist.at(k);
1089 if (s1->is_Load() && s2->is_Load())
1090 continue;
1091 SWPointer p2(s2->as_Mem(), this, NULL, false);
1092
1093 int cmp = p1.cmp(p2);
1094 if (SuperWordRTDepCheck &&
1095 p1.base() != p2.base() && p1.valid() && p2.valid()) {
1096 // Create a runtime check to disambiguate
1097 OrderedPair pp(p1.base(), p2.base());
1098 _disjoint_ptrs.append_if_missing(pp);
1099 } else if (!SWPointer::not_equal(cmp)) {
1100 // Possibly same address
1101 _dg.make_edge(s1, s2);
1102 sink_dependent = false;
1103 }
1104 }
1105 if (sink_dependent) {
1106 _dg.make_edge(s1, slice_sink);
1107 }
1108 }
1109
1110 if (TraceSuperWord) {
1111 tty->print_cr("\nDependence graph for slice: %d", n->_idx);
1112 for (int q = 0; q < _nlist.length(); q++) {
1113 _dg.print(_nlist.at(q));
1114 }
1115 tty->cr();
1116 }
1117
1118 _nlist.clear();
1119 }
1120
1121 if (TraceSuperWord) {
1122 tty->print_cr("\ndisjoint_ptrs: %s", _disjoint_ptrs.length() > 0 ? "" : "NONE");
1123 for (int r = 0; r < _disjoint_ptrs.length(); r++) {
1124 _disjoint_ptrs.at(r).print();
1125 tty->cr();
1126 }
1127 tty->cr();
1128 }
1129
1130 }
1131
1132 //---------------------------mem_slice_preds---------------------------
1133 // Return a memory slice (node list) in predecessor order starting at "start"
1134 void SuperWord::mem_slice_preds(Node* start, Node* stop, GrowableArray<Node*> &preds) {
1135 assert(preds.length() == 0, "start empty");
1136 Node* n = start;
1137 Node* prev = NULL;
1138 while (true) {
1139 NOT_PRODUCT( if(is_trace_mem_slice()) tty->print_cr("SuperWord::mem_slice_preds: n %d", n->_idx);)
1140 assert(in_bb(n), "must be in block");
1141 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
1142 Node* out = n->fast_out(i);
1143 if (out->is_Load()) {
1144 if (in_bb(out)) {
1145 preds.push(out);
1146 if (TraceSuperWord && Verbose) {
1147 tty->print_cr("SuperWord::mem_slice_preds: added pred(%d)", out->_idx);
1148 }
1149 }
1150 } else {
1151 // FIXME
1152 if (out->is_MergeMem() && !in_bb(out)) {
1153 // Either unrolling is causing a memory edge not to disappear,
1154 // or need to run igvn.optimize() again before SLP
1155 } else if (out->is_Phi() && out->bottom_type() == Type::MEMORY && !in_bb(out)) {
1156 // Ditto. Not sure what else to check further.
1157 } else if (out->Opcode() == Op_StoreCM && out->in(MemNode::OopStore) == n) {
1158 // StoreCM has an input edge used as a precedence edge.
1159 // Maybe an issue when oop stores are vectorized.
1160 } else {
1161 assert(out == prev || prev == NULL, "no branches off of store slice");
1162 }
1163 }//else
1164 }//for
1165 if (n == stop) break;
1166 preds.push(n);
1167 if (TraceSuperWord && Verbose) {
1168 tty->print_cr("SuperWord::mem_slice_preds: added pred(%d)", n->_idx);
1169 }
1170 prev = n;
1171 assert(n->is_Mem(), "unexpected node %s", n->Name());
1172 n = n->in(MemNode::Memory);
1173 }
1174 }
1175
1176 //------------------------------stmts_can_pack---------------------------
1177 // Can s1 and s2 be in a pack with s1 immediately preceding s2 and
1178 // s1 aligned at "align"
1179 bool SuperWord::stmts_can_pack(Node* s1, Node* s2, int align) {
1180
1181 // Do not use superword for non-primitives
1182 BasicType bt1 = velt_basic_type(s1);
1183 BasicType bt2 = velt_basic_type(s2);
1184 if(!is_java_primitive(bt1) || !is_java_primitive(bt2))
1185 return false;
1186 if (Matcher::max_vector_size(bt1) < 2) {
1187 return false; // No vectors for this type
1188 }
1189
1190 if (isomorphic(s1, s2)) {
1191 if ((independent(s1, s2) && have_similar_inputs(s1, s2)) || reduction(s1, s2)) {
1192 if (!exists_at(s1, 0) && !exists_at(s2, 1)) {
1193 if (!s1->is_Mem() || are_adjacent_refs(s1, s2)) {
1194 int s1_align = alignment(s1);
1195 int s2_align = alignment(s2);
1196 if (s1_align == top_align || s1_align == align) {
1197 if (s2_align == top_align || s2_align == align + data_size(s1)) {
1198 return true;
1199 }
1200 }
1201 }
1202 }
1203 }
1204 }
1205 return false;
1206 }
1207
1208 //------------------------------exists_at---------------------------
1209 // Does s exist in a pack at position pos?
1210 bool SuperWord::exists_at(Node* s, uint pos) {
1211 for (int i = 0; i < _packset.length(); i++) {
1212 Node_List* p = _packset.at(i);
1213 if (p->at(pos) == s) {
1214 return true;
1215 }
1216 }
1217 return false;
1218 }
1219
1220 //------------------------------are_adjacent_refs---------------------------
1221 // Is s1 immediately before s2 in memory?
1222 bool SuperWord::are_adjacent_refs(Node* s1, Node* s2) {
1223 if (!s1->is_Mem() || !s2->is_Mem()) return false;
1224 if (!in_bb(s1) || !in_bb(s2)) return false;
1225
1226 // Do not use superword for non-primitives
1227 if (!is_java_primitive(s1->as_Mem()->memory_type()) ||
1228 !is_java_primitive(s2->as_Mem()->memory_type())) {
1229 return false;
1230 }
1231
1232 // FIXME - co_locate_pack fails on Stores in different mem-slices, so
1233 // only pack memops that are in the same alias set until that's fixed.
1234 if (_phase->C->get_alias_index(s1->as_Mem()->adr_type()) !=
1235 _phase->C->get_alias_index(s2->as_Mem()->adr_type()))
1236 return false;
1237 SWPointer p1(s1->as_Mem(), this, NULL, false);
1238 SWPointer p2(s2->as_Mem(), this, NULL, false);
1239 if (p1.base() != p2.base() || !p1.comparable(p2)) return false;
1240 int diff = p2.offset_in_bytes() - p1.offset_in_bytes();
1241 return diff == data_size(s1);
1242 }
1243
1244 //------------------------------isomorphic---------------------------
1245 // Are s1 and s2 similar?
1246 bool SuperWord::isomorphic(Node* s1, Node* s2) {
1247 if (s1->Opcode() != s2->Opcode()) return false;
1248 if (s1->req() != s2->req()) return false;
1249 if (!same_velt_type(s1, s2)) return false;
1250 Node* s1_ctrl = s1->in(0);
1251 Node* s2_ctrl = s2->in(0);
1252 // If the control nodes are equivalent, no further checks are required to test for isomorphism.
1253 if (s1_ctrl == s2_ctrl) {
1254 return true;
1255 } else {
1256 bool s1_ctrl_inv = ((s1_ctrl == NULL) ? true : lpt()->is_invariant(s1_ctrl));
1257 bool s2_ctrl_inv = ((s2_ctrl == NULL) ? true : lpt()->is_invariant(s2_ctrl));
1258 // If the control nodes are not invariant for the loop, fail isomorphism test.
1259 if (!s1_ctrl_inv || !s2_ctrl_inv) {
1260 return false;
1261 }
1262 if(s1_ctrl != NULL && s2_ctrl != NULL) {
1263 if (s1_ctrl->is_Proj()) {
1264 s1_ctrl = s1_ctrl->in(0);
1265 assert(lpt()->is_invariant(s1_ctrl), "must be invariant");
1266 }
1267 if (s2_ctrl->is_Proj()) {
1268 s2_ctrl = s2_ctrl->in(0);
1269 assert(lpt()->is_invariant(s2_ctrl), "must be invariant");
1270 }
1271 if (!s1_ctrl->is_RangeCheck() || !s2_ctrl->is_RangeCheck()) {
1272 return false;
1273 }
1274 }
1275 // Control nodes are invariant. However, we have no way of checking whether they resolve
1276 // in an equivalent manner. But, we know that invariant range checks are guaranteed to
1277 // throw before the loop (if they would have thrown). Thus, the loop would not have been reached.
1278 // Therefore, if the control nodes for both are range checks, we accept them to be isomorphic.
1279 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) {
1280 Node* t1 = s1->fast_out(i);
1281 for (DUIterator_Fast jmax, j = s2->fast_outs(jmax); j < jmax; j++) {
1282 Node* t2 = s2->fast_out(j);
1283 if (VectorNode::is_muladds2i(t1) && VectorNode::is_muladds2i(t2)) {
1284 return true;
1285 }
1286 }
1287 }
1288 }
1289 return false;
1290 }
1291
1292 //------------------------------independent---------------------------
1293 // Is there no data path from s1 to s2 or s2 to s1?
1294 bool SuperWord::independent(Node* s1, Node* s2) {
1295 // assert(s1->Opcode() == s2->Opcode(), "check isomorphic first");
1296 int d1 = depth(s1);
1297 int d2 = depth(s2);
1298 if (d1 == d2) return s1 != s2;
1299 Node* deep = d1 > d2 ? s1 : s2;
1300 Node* shallow = d1 > d2 ? s2 : s1;
1301
1302 visited_clear();
1303
1304 return independent_path(shallow, deep);
1305 }
1306
1307 //--------------------------have_similar_inputs-----------------------
1308 // For a node pair (s1, s2) which is isomorphic and independent,
1309 // do s1 and s2 have similar input edges?
1310 bool SuperWord::have_similar_inputs(Node* s1, Node* s2) {
1311 // assert(isomorphic(s1, s2) == true, "check isomorphic");
1312 // assert(independent(s1, s2) == true, "check independent");
1313 if (s1->req() > 1 && !s1->is_Store() && !s1->is_Load()) {
1314 for (uint i = 1; i < s1->req(); i++) {
1315 if (s1->in(i)->Opcode() != s2->in(i)->Opcode()) return false;
1316 }
1317 }
1318 return true;
1319 }
1320
1321 //------------------------------reduction---------------------------
1322 // Is there a data path between s1 and s2 and the nodes reductions?
1323 bool SuperWord::reduction(Node* s1, Node* s2) {
1324 bool retValue = false;
1325 int d1 = depth(s1);
1326 int d2 = depth(s2);
1327 if (d2 > d1) {
1328 if (s1->is_reduction() && s2->is_reduction()) {
1329 // This is an ordered set, so s1 should define s2
1330 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) {
1331 Node* t1 = s1->fast_out(i);
1332 if (t1 == s2) {
1333 // both nodes are reductions and connected
1334 retValue = true;
1335 }
1336 }
1337 }
1338 }
1339
1340 return retValue;
1341 }
1342
1343 //------------------------------independent_path------------------------------
1344 // Helper for independent
1345 bool SuperWord::independent_path(Node* shallow, Node* deep, uint dp) {
1346 if (dp >= 1000) return false; // stop deep recursion
1347 visited_set(deep);
1348 int shal_depth = depth(shallow);
1349 assert(shal_depth <= depth(deep), "must be");
1350 for (DepPreds preds(deep, _dg); !preds.done(); preds.next()) {
1351 Node* pred = preds.current();
1352 if (in_bb(pred) && !visited_test(pred)) {
1353 if (shallow == pred) {
1354 return false;
1355 }
1356 if (shal_depth < depth(pred) && !independent_path(shallow, pred, dp+1)) {
1357 return false;
1358 }
1359 }
1360 }
1361 return true;
1362 }
1363
1364 //------------------------------set_alignment---------------------------
1365 void SuperWord::set_alignment(Node* s1, Node* s2, int align) {
1366 set_alignment(s1, align);
1367 if (align == top_align || align == bottom_align) {
1368 set_alignment(s2, align);
1369 } else {
1370 set_alignment(s2, align + data_size(s1));
1371 }
1372 }
1373
1374 //------------------------------data_size---------------------------
1375 int SuperWord::data_size(Node* s) {
1376 Node* use = NULL; //test if the node is a candidate for CMoveV optimization, then return the size of CMov
1377 if (UseVectorCmov) {
1378 use = _cmovev_kit.is_Bool_candidate(s);
1379 if (use != NULL) {
1380 return data_size(use);
1381 }
1382 use = _cmovev_kit.is_CmpD_candidate(s);
1383 if (use != NULL) {
1384 return data_size(use);
1385 }
1386 }
1387
1388 int bsize = type2aelembytes(velt_basic_type(s));
1389 assert(bsize != 0, "valid size");
1390 return bsize;
1391 }
1392
1393 //------------------------------extend_packlist---------------------------
1394 // Extend packset by following use->def and def->use links from pack members.
1395 void SuperWord::extend_packlist() {
1396 bool changed;
1397 do {
1398 packset_sort(_packset.length());
1399 changed = false;
1400 for (int i = 0; i < _packset.length(); i++) {
1401 Node_List* p = _packset.at(i);
1402 changed |= follow_use_defs(p);
1403 changed |= follow_def_uses(p);
1404 }
1405 } while (changed);
1406
1407 if (_race_possible) {
1408 for (int i = 0; i < _packset.length(); i++) {
1409 Node_List* p = _packset.at(i);
1410 order_def_uses(p);
1411 }
1412 }
1413
1414 if (TraceSuperWord) {
1415 tty->print_cr("\nAfter extend_packlist");
1416 print_packset();
1417 }
1418 }
1419
1420 //------------------------------follow_use_defs---------------------------
1421 // Extend the packset by visiting operand definitions of nodes in pack p
1422 bool SuperWord::follow_use_defs(Node_List* p) {
1423 assert(p->size() == 2, "just checking");
1424 Node* s1 = p->at(0);
1425 Node* s2 = p->at(1);
1426 assert(s1->req() == s2->req(), "just checking");
1427 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking");
1428
1429 if (s1->is_Load()) return false;
1430
1431 int align = alignment(s1);
1432 NOT_PRODUCT(if(is_trace_alignment()) tty->print_cr("SuperWord::follow_use_defs: s1 %d, align %d", s1->_idx, align);)
1433 bool changed = false;
1434 int start = s1->is_Store() ? MemNode::ValueIn : 1;
1435 int end = s1->is_Store() ? MemNode::ValueIn+1 : s1->req();
1436 for (int j = start; j < end; j++) {
1437 Node* t1 = s1->in(j);
1438 Node* t2 = s2->in(j);
1439 if (!in_bb(t1) || !in_bb(t2))
1440 continue;
1441 if (stmts_can_pack(t1, t2, align)) {
1442 if (est_savings(t1, t2) >= 0) {
1443 Node_List* pair = new Node_List();
1444 pair->push(t1);
1445 pair->push(t2);
1446 _packset.append(pair);
1447 NOT_PRODUCT(if(is_trace_alignment()) tty->print_cr("SuperWord::follow_use_defs: set_alignment(%d, %d, %d)", t1->_idx, t2->_idx, align);)
1448 set_alignment(t1, t2, align);
1449 changed = true;
1450 }
1451 }
1452 }
1453 return changed;
1454 }
1455
1456 //------------------------------follow_def_uses---------------------------
1457 // Extend the packset by visiting uses of nodes in pack p
1458 bool SuperWord::follow_def_uses(Node_List* p) {
1459 bool changed = false;
1460 Node* s1 = p->at(0);
1461 Node* s2 = p->at(1);
1462 assert(p->size() == 2, "just checking");
1463 assert(s1->req() == s2->req(), "just checking");
1464 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking");
1465
1466 if (s1->is_Store()) return false;
1467
1468 int align = alignment(s1);
1469 NOT_PRODUCT(if(is_trace_alignment()) tty->print_cr("SuperWord::follow_def_uses: s1 %d, align %d", s1->_idx, align);)
1470 int savings = -1;
1471 int num_s1_uses = 0;
1472 Node* u1 = NULL;
1473 Node* u2 = NULL;
1474 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) {
1475 Node* t1 = s1->fast_out(i);
1476 num_s1_uses++;
1477 if (!in_bb(t1)) continue;
1478 for (DUIterator_Fast jmax, j = s2->fast_outs(jmax); j < jmax; j++) {
1479 Node* t2 = s2->fast_out(j);
1480 if (!in_bb(t2)) continue;
1481 if (t2->Opcode() == Op_AddI && t2 == _lp->as_CountedLoop()->incr()) continue; // don't mess with the iv
1482 if (!opnd_positions_match(s1, t1, s2, t2))
1483 continue;
1484 if (stmts_can_pack(t1, t2, align)) {
1485 int my_savings = est_savings(t1, t2);
1486 if (my_savings > savings) {
1487 savings = my_savings;
1488 u1 = t1;
1489 u2 = t2;
1490 }
1491 }
1492 }
1493 }
1494 if (num_s1_uses > 1) {
1495 _race_possible = true;
1496 }
1497 if (savings >= 0) {
1498 Node_List* pair = new Node_List();
1499 pair->push(u1);
1500 pair->push(u2);
1501 _packset.append(pair);
1502 NOT_PRODUCT(if(is_trace_alignment()) tty->print_cr("SuperWord::follow_def_uses: set_alignment(%d, %d, %d)", u1->_idx, u2->_idx, align);)
1503 set_alignment(u1, u2, align);
1504 changed = true;
1505 }
1506 return changed;
1507 }
1508
1509 //------------------------------order_def_uses---------------------------
1510 // For extended packsets, ordinally arrange uses packset by major component
1511 void SuperWord::order_def_uses(Node_List* p) {
1512 Node* s1 = p->at(0);
1513
1514 if (s1->is_Store()) return;
1515
1516 // reductions are always managed beforehand
1517 if (s1->is_reduction()) return;
1518
1519 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) {
1520 Node* t1 = s1->fast_out(i);
1521
1522 // Only allow operand swap on commuting operations
1523 if (!t1->is_Add() && !t1->is_Mul() && !VectorNode::is_muladds2i(t1)) {
1524 break;
1525 }
1526
1527 // Now find t1's packset
1528 Node_List* p2 = NULL;
1529 for (int j = 0; j < _packset.length(); j++) {
1530 p2 = _packset.at(j);
1531 Node* first = p2->at(0);
1532 if (t1 == first) {
1533 break;
1534 }
1535 p2 = NULL;
1536 }
1537 // Arrange all sub components by the major component
1538 if (p2 != NULL) {
1539 for (uint j = 1; j < p->size(); j++) {
1540 Node* d1 = p->at(j);
1541 Node* u1 = p2->at(j);
1542 opnd_positions_match(s1, t1, d1, u1);
1543 }
1544 }
1545 }
1546 }
1547
1548 //---------------------------opnd_positions_match-------------------------
1549 // Is the use of d1 in u1 at the same operand position as d2 in u2?
1550 bool SuperWord::opnd_positions_match(Node* d1, Node* u1, Node* d2, Node* u2) {
1551 // check reductions to see if they are marshalled to represent the reduction
1552 // operator in a specified opnd
1553 if (u1->is_reduction() && u2->is_reduction()) {
1554 // ensure reductions have phis and reduction definitions feeding the 1st operand
1555 Node* first = u1->in(2);
1556 if (first->is_Phi() || first->is_reduction()) {
1557 u1->swap_edges(1, 2);
1558 }
1559 // ensure reductions have phis and reduction definitions feeding the 1st operand
1560 first = u2->in(2);
1561 if (first->is_Phi() || first->is_reduction()) {
1562 u2->swap_edges(1, 2);
1563 }
1564 return true;
1565 }
1566
1567 uint ct = u1->req();
1568 if (ct != u2->req()) return false;
1569 uint i1 = 0;
1570 uint i2 = 0;
1571 do {
1572 for (i1++; i1 < ct; i1++) if (u1->in(i1) == d1) break;
1573 for (i2++; i2 < ct; i2++) if (u2->in(i2) == d2) break;
1574 if (i1 != i2) {
1575 if ((i1 == (3-i2)) && (u2->is_Add() || u2->is_Mul())) {
1576 // Further analysis relies on operands position matching.
1577 u2->swap_edges(i1, i2);
1578 } else if (VectorNode::is_muladds2i(u2) && u1 != u2) {
1579 if (i1 == 5 - i2) { // ((i1 == 3 && i2 == 2) || (i1 == 2 && i2 == 3) || (i1 == 1 && i2 == 4) || (i1 == 4 && i2 == 1))
1580 u2->swap_edges(1, 2);
1581 u2->swap_edges(3, 4);
1582 }
1583 if (i1 == 3 - i2 || i1 == 7 - i2) { // ((i1 == 1 && i2 == 2) || (i1 == 2 && i2 == 1) || (i1 == 3 && i2 == 4) || (i1 == 4 && i2 == 3))
1584 u2->swap_edges(2, 3);
1585 u2->swap_edges(1, 4);
1586 }
1587 return false; // Just swap the edges, the muladds2i nodes get packed in follow_use_defs
1588 } else {
1589 return false;
1590 }
1591 } else if (i1 == i2 && VectorNode::is_muladds2i(u2) && u1 != u2) {
1592 u2->swap_edges(1, 3);
1593 u2->swap_edges(2, 4);
1594 return false; // Just swap the edges, the muladds2i nodes get packed in follow_use_defs
1595 }
1596 } while (i1 < ct);
1597 return true;
1598 }
1599
1600 //------------------------------est_savings---------------------------
1601 // Estimate the savings from executing s1 and s2 as a pack
1602 int SuperWord::est_savings(Node* s1, Node* s2) {
1603 int save_in = 2 - 1; // 2 operations per instruction in packed form
1604
1605 // inputs
1606 for (uint i = 1; i < s1->req(); i++) {
1607 Node* x1 = s1->in(i);
1608 Node* x2 = s2->in(i);
1609 if (x1 != x2) {
1610 if (are_adjacent_refs(x1, x2)) {
1611 save_in += adjacent_profit(x1, x2);
1612 } else if (!in_packset(x1, x2)) {
1613 save_in -= pack_cost(2);
1614 } else {
1615 save_in += unpack_cost(2);
1616 }
1617 }
1618 }
1619
1620 // uses of result
1621 uint ct = 0;
1622 int save_use = 0;
1623 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) {
1624 Node* s1_use = s1->fast_out(i);
1625 for (int j = 0; j < _packset.length(); j++) {
1626 Node_List* p = _packset.at(j);
1627 if (p->at(0) == s1_use) {
1628 for (DUIterator_Fast kmax, k = s2->fast_outs(kmax); k < kmax; k++) {
1629 Node* s2_use = s2->fast_out(k);
1630 if (p->at(p->size()-1) == s2_use) {
1631 ct++;
1632 if (are_adjacent_refs(s1_use, s2_use)) {
1633 save_use += adjacent_profit(s1_use, s2_use);
1634 }
1635 }
1636 }
1637 }
1638 }
1639 }
1640
1641 if (ct < s1->outcnt()) save_use += unpack_cost(1);
1642 if (ct < s2->outcnt()) save_use += unpack_cost(1);
1643
1644 return MAX2(save_in, save_use);
1645 }
1646
1647 //------------------------------costs---------------------------
1648 int SuperWord::adjacent_profit(Node* s1, Node* s2) { return 2; }
1649 int SuperWord::pack_cost(int ct) { return ct; }
1650 int SuperWord::unpack_cost(int ct) { return ct; }
1651
1652 //------------------------------combine_packs---------------------------
1653 // Combine packs A and B with A.last == B.first into A.first..,A.last,B.second,..B.last
1654 void SuperWord::combine_packs() {
1655 bool changed = true;
1656 // Combine packs regardless max vector size.
1657 while (changed) {
1658 changed = false;
1659 for (int i = 0; i < _packset.length(); i++) {
1660 Node_List* p1 = _packset.at(i);
1661 if (p1 == NULL) continue;
1662 // Because of sorting we can start at i + 1
1663 for (int j = i + 1; j < _packset.length(); j++) {
1664 Node_List* p2 = _packset.at(j);
1665 if (p2 == NULL) continue;
1666 if (i == j) continue;
1667 if (p1->at(p1->size()-1) == p2->at(0)) {
1668 for (uint k = 1; k < p2->size(); k++) {
1669 p1->push(p2->at(k));
1670 }
1671 _packset.at_put(j, NULL);
1672 changed = true;
1673 }
1674 }
1675 }
1676 }
1677
1678 // Split packs which have size greater then max vector size.
1679 for (int i = 0; i < _packset.length(); i++) {
1680 Node_List* p1 = _packset.at(i);
1681 if (p1 != NULL) {
1682 BasicType bt = velt_basic_type(p1->at(0));
1683 uint max_vlen = Matcher::max_vector_size(bt); // Max elements in vector
1684 assert(is_power_of_2(max_vlen), "sanity");
1685 uint psize = p1->size();
1686 if (!is_power_of_2(psize)) {
1687 // Skip pack which can't be vector.
1688 // case1: for(...) { a[i] = i; } elements values are different (i+x)
1689 // case2: for(...) { a[i] = b[i+1]; } can't align both, load and store
1690 _packset.at_put(i, NULL);
1691 continue;
1692 }
1693 if (psize > max_vlen) {
1694 Node_List* pack = new Node_List();
1695 for (uint j = 0; j < psize; j++) {
1696 pack->push(p1->at(j));
1697 if (pack->size() >= max_vlen) {
1698 assert(is_power_of_2(pack->size()), "sanity");
1699 _packset.append(pack);
1700 pack = new Node_List();
1701 }
1702 }
1703 _packset.at_put(i, NULL);
1704 }
1705 }
1706 }
1707
1708 // Compress list.
1709 for (int i = _packset.length() - 1; i >= 0; i--) {
1710 Node_List* p1 = _packset.at(i);
1711 if (p1 == NULL) {
1712 _packset.remove_at(i);
1713 }
1714 }
1715
1716 if (TraceSuperWord) {
1717 tty->print_cr("\nAfter combine_packs");
1718 print_packset();
1719 }
1720 }
1721
1722 //-----------------------------construct_my_pack_map--------------------------
1723 // Construct the map from nodes to packs. Only valid after the
1724 // point where a node is only in one pack (after combine_packs).
1725 void SuperWord::construct_my_pack_map() {
1726 Node_List* rslt = NULL;
1727 for (int i = 0; i < _packset.length(); i++) {
1728 Node_List* p = _packset.at(i);
1729 for (uint j = 0; j < p->size(); j++) {
1730 Node* s = p->at(j);
1731 #ifdef ASSERT
1732 if (my_pack(s) != NULL) {
1733 s->dump(1);
1734 tty->print_cr("packs[%d]:", i);
1735 print_pack(p);
1736 assert(false, "only in one pack");
1737 }
1738 #endif
1739 set_my_pack(s, p);
1740 }
1741 }
1742 }
1743
1744 //------------------------------filter_packs---------------------------
1745 // Remove packs that are not implemented or not profitable.
1746 void SuperWord::filter_packs() {
1747 // Remove packs that are not implemented
1748 for (int i = _packset.length() - 1; i >= 0; i--) {
1749 Node_List* pk = _packset.at(i);
1750 bool impl = implemented(pk);
1751 if (!impl) {
1752 #ifndef PRODUCT
1753 if ((TraceSuperWord && Verbose) || _vector_loop_debug) {
1754 tty->print_cr("Unimplemented");
1755 pk->at(0)->dump();
1756 }
1757 #endif
1758 remove_pack_at(i);
1759 }
1760 Node *n = pk->at(0);
1761 if (n->is_reduction()) {
1762 _num_reductions++;
1763 } else {
1764 _num_work_vecs++;
1765 }
1766 }
1767
1768 // Remove packs that are not profitable
1769 bool changed;
1770 do {
1771 changed = false;
1772 for (int i = _packset.length() - 1; i >= 0; i--) {
1773 Node_List* pk = _packset.at(i);
1774 bool prof = profitable(pk);
1775 if (!prof) {
1776 #ifndef PRODUCT
1777 if ((TraceSuperWord && Verbose) || _vector_loop_debug) {
1778 tty->print_cr("Unprofitable");
1779 pk->at(0)->dump();
1780 }
1781 #endif
1782 remove_pack_at(i);
1783 changed = true;
1784 }
1785 }
1786 } while (changed);
1787
1788 #ifndef PRODUCT
1789 if (TraceSuperWord) {
1790 tty->print_cr("\nAfter filter_packs");
1791 print_packset();
1792 tty->cr();
1793 }
1794 #endif
1795 }
1796
1797 //------------------------------merge_packs_to_cmovd---------------------------
1798 // Merge CMoveD into new vector-nodes
1799 // We want to catch this pattern and subsume CmpD and Bool into CMoveD
1800 //
1801 // SubD ConD
1802 // / | /
1803 // / | / /
1804 // / | / /
1805 // / | / /
1806 // / / /
1807 // / / | /
1808 // v / | /
1809 // CmpD | /
1810 // | | /
1811 // v | /
1812 // Bool | /
1813 // \ | /
1814 // \ | /
1815 // \ | /
1816 // \ | /
1817 // \ v /
1818 // CMoveD
1819 //
1820
1821 void SuperWord::merge_packs_to_cmovd() {
1822 for (int i = _packset.length() - 1; i >= 0; i--) {
1823 _cmovev_kit.make_cmovevd_pack(_packset.at(i));
1824 }
1825 #ifndef PRODUCT
1826 if (TraceSuperWord) {
1827 tty->print_cr("\nSuperWord::merge_packs_to_cmovd(): After merge");
1828 print_packset();
1829 tty->cr();
1830 }
1831 #endif
1832 }
1833
1834 Node* CMoveKit::is_Bool_candidate(Node* def) const {
1835 Node* use = NULL;
1836 if (!def->is_Bool() || def->in(0) != NULL || def->outcnt() != 1) {
1837 return NULL;
1838 }
1839 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) {
1840 use = def->fast_out(j);
1841 if (!_sw->same_generation(def, use) || !use->is_CMove()) {
1842 return NULL;
1843 }
1844 }
1845 return use;
1846 }
1847
1848 Node* CMoveKit::is_CmpD_candidate(Node* def) const {
1849 Node* use = NULL;
1850 if (!def->is_Cmp() || def->in(0) != NULL || def->outcnt() != 1) {
1851 return NULL;
1852 }
1853 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) {
1854 use = def->fast_out(j);
1855 if (!_sw->same_generation(def, use) || (use = is_Bool_candidate(use)) == NULL || !_sw->same_generation(def, use)) {
1856 return NULL;
1857 }
1858 }
1859 return use;
1860 }
1861
1862 Node_List* CMoveKit::make_cmovevd_pack(Node_List* cmovd_pk) {
1863 Node *cmovd = cmovd_pk->at(0);
1864 if (!cmovd->is_CMove()) {
1865 return NULL;
1866 }
1867 if (cmovd->Opcode() != Op_CMoveF && cmovd->Opcode() != Op_CMoveD) {
1868 return NULL;
1869 }
1870 if (pack(cmovd) != NULL) { // already in the cmov pack
1871 return NULL;
1872 }
1873 if (cmovd->in(0) != NULL) {
1874 NOT_PRODUCT(if(_sw->is_trace_cmov()) {tty->print("CMoveKit::make_cmovevd_pack: CMoveD %d has control flow, escaping...", cmovd->_idx); cmovd->dump();})
1875 return NULL;
1876 }
1877
1878 Node* bol = cmovd->as_CMove()->in(CMoveNode::Condition);
1879 if (!bol->is_Bool()
1880 || bol->outcnt() != 1
1881 || !_sw->same_generation(bol, cmovd)
1882 || bol->in(0) != NULL // BoolNode has control flow!!
1883 || _sw->my_pack(bol) == NULL) {
1884 NOT_PRODUCT(if(_sw->is_trace_cmov()) {tty->print("CMoveKit::make_cmovevd_pack: Bool %d does not fit CMoveD %d for building vector, escaping...", bol->_idx, cmovd->_idx); bol->dump();})
1885 return NULL;
1886 }
1887 Node_List* bool_pk = _sw->my_pack(bol);
1888 if (bool_pk->size() != cmovd_pk->size() ) {
1889 return NULL;
1890 }
1891
1892 Node* cmpd = bol->in(1);
1893 if (!cmpd->is_Cmp()
1894 || cmpd->outcnt() != 1
1895 || !_sw->same_generation(cmpd, cmovd)
1896 || cmpd->in(0) != NULL // CmpDNode has control flow!!
1897 || _sw->my_pack(cmpd) == NULL) {
1898 NOT_PRODUCT(if(_sw->is_trace_cmov()) {tty->print("CMoveKit::make_cmovevd_pack: CmpD %d does not fit CMoveD %d for building vector, escaping...", cmpd->_idx, cmovd->_idx); cmpd->dump();})
1899 return NULL;
1900 }
1901 Node_List* cmpd_pk = _sw->my_pack(cmpd);
1902 if (cmpd_pk->size() != cmovd_pk->size() ) {
1903 return NULL;
1904 }
1905
1906 if (!test_cmpd_pack(cmpd_pk, cmovd_pk)) {
1907 NOT_PRODUCT(if(_sw->is_trace_cmov()) {tty->print("CMoveKit::make_cmovevd_pack: cmpd pack for CmpD %d failed vectorization test", cmpd->_idx); cmpd->dump();})
1908 return NULL;
1909 }
1910
1911 Node_List* new_cmpd_pk = new Node_List();
1912 uint sz = cmovd_pk->size() - 1;
1913 for (uint i = 0; i <= sz; ++i) {
1914 Node* cmov = cmovd_pk->at(i);
1915 Node* bol = bool_pk->at(i);
1916 Node* cmp = cmpd_pk->at(i);
1917
1918 new_cmpd_pk->insert(i, cmov);
1919
1920 map(cmov, new_cmpd_pk);
1921 map(bol, new_cmpd_pk);
1922 map(cmp, new_cmpd_pk);
1923
1924 _sw->set_my_pack(cmov, new_cmpd_pk); // and keep old packs for cmp and bool
1925 }
1926 _sw->_packset.remove(cmovd_pk);
1927 _sw->_packset.remove(bool_pk);
1928 _sw->_packset.remove(cmpd_pk);
1929 _sw->_packset.append(new_cmpd_pk);
1930 NOT_PRODUCT(if(_sw->is_trace_cmov()) {tty->print_cr("CMoveKit::make_cmovevd_pack: added syntactic CMoveD pack"); _sw->print_pack(new_cmpd_pk);})
1931 return new_cmpd_pk;
1932 }
1933
1934 bool CMoveKit::test_cmpd_pack(Node_List* cmpd_pk, Node_List* cmovd_pk) {
1935 Node* cmpd0 = cmpd_pk->at(0);
1936 assert(cmpd0->is_Cmp(), "CMoveKit::test_cmpd_pack: should be CmpDNode");
1937 assert(cmovd_pk->at(0)->is_CMove(), "CMoveKit::test_cmpd_pack: should be CMoveD");
1938 assert(cmpd_pk->size() == cmovd_pk->size(), "CMoveKit::test_cmpd_pack: should be same size");
1939 Node* in1 = cmpd0->in(1);
1940 Node* in2 = cmpd0->in(2);
1941 Node_List* in1_pk = _sw->my_pack(in1);
1942 Node_List* in2_pk = _sw->my_pack(in2);
1943
1944 if ( (in1_pk != NULL && in1_pk->size() != cmpd_pk->size())
1945 || (in2_pk != NULL && in2_pk->size() != cmpd_pk->size()) ) {
1946 return false;
1947 }
1948
1949 // test if "all" in1 are in the same pack or the same node
1950 if (in1_pk == NULL) {
1951 for (uint j = 1; j < cmpd_pk->size(); j++) {
1952 if (cmpd_pk->at(j)->in(1) != in1) {
1953 return false;
1954 }
1955 }//for: in1_pk is not pack but all CmpD nodes in the pack have the same in(1)
1956 }
1957 // test if "all" in2 are in the same pack or the same node
1958 if (in2_pk == NULL) {
1959 for (uint j = 1; j < cmpd_pk->size(); j++) {
1960 if (cmpd_pk->at(j)->in(2) != in2) {
1961 return false;
1962 }
1963 }//for: in2_pk is not pack but all CmpD nodes in the pack have the same in(2)
1964 }
1965 //now check if cmpd_pk may be subsumed in vector built for cmovd_pk
1966 int cmovd_ind1, cmovd_ind2;
1967 if (cmpd_pk->at(0)->in(1) == cmovd_pk->at(0)->as_CMove()->in(CMoveNode::IfFalse)
1968 && cmpd_pk->at(0)->in(2) == cmovd_pk->at(0)->as_CMove()->in(CMoveNode::IfTrue)) {
1969 cmovd_ind1 = CMoveNode::IfFalse;
1970 cmovd_ind2 = CMoveNode::IfTrue;
1971 } else if (cmpd_pk->at(0)->in(2) == cmovd_pk->at(0)->as_CMove()->in(CMoveNode::IfFalse)
1972 && cmpd_pk->at(0)->in(1) == cmovd_pk->at(0)->as_CMove()->in(CMoveNode::IfTrue)) {
1973 cmovd_ind2 = CMoveNode::IfFalse;
1974 cmovd_ind1 = CMoveNode::IfTrue;
1975 }
1976 else {
1977 return false;
1978 }
1979
1980 for (uint j = 1; j < cmpd_pk->size(); j++) {
1981 if (cmpd_pk->at(j)->in(1) != cmovd_pk->at(j)->as_CMove()->in(cmovd_ind1)
1982 || cmpd_pk->at(j)->in(2) != cmovd_pk->at(j)->as_CMove()->in(cmovd_ind2)) {
1983 return false;
1984 }//if
1985 }
1986 NOT_PRODUCT(if(_sw->is_trace_cmov()) { tty->print("CMoveKit::test_cmpd_pack: cmpd pack for 1st CmpD %d is OK for vectorization: ", cmpd0->_idx); cmpd0->dump(); })
1987 return true;
1988 }
1989
1990 //------------------------------implemented---------------------------
1991 // Can code be generated for pack p?
1992 bool SuperWord::implemented(Node_List* p) {
1993 bool retValue = false;
1994 Node* p0 = p->at(0);
1995 if (p0 != NULL) {
1996 int opc = p0->Opcode();
1997 uint size = p->size();
1998 if (p0->is_reduction()) {
1999 const Type *arith_type = p0->bottom_type();
2000 // Length 2 reductions of INT/LONG do not offer performance benefits
2001 if (((arith_type->basic_type() == T_INT) || (arith_type->basic_type() == T_LONG)) && (size == 2)) {
2002 retValue = false;
2003 } else {
2004 retValue = ReductionNode::implemented(opc, size, arith_type->basic_type());
2005 }
2006 } else {
2007 retValue = VectorNode::implemented(opc, size, velt_basic_type(p0));
2008 }
2009 if (!retValue) {
2010 if (is_cmov_pack(p)) {
2011 NOT_PRODUCT(if(is_trace_cmov()) {tty->print_cr("SWPointer::implemented: found cmpd pack"); print_pack(p);})
2012 return true;
2013 }
2014 }
2015 }
2016 return retValue;
2017 }
2018
2019 bool SuperWord::is_cmov_pack(Node_List* p) {
2020 return _cmovev_kit.pack(p->at(0)) != NULL;
2021 }
2022 //------------------------------same_inputs--------------------------
2023 // For pack p, are all idx operands the same?
2024 bool SuperWord::same_inputs(Node_List* p, int idx) {
2025 Node* p0 = p->at(0);
2026 uint vlen = p->size();
2027 Node* p0_def = p0->in(idx);
2028 for (uint i = 1; i < vlen; i++) {
2029 Node* pi = p->at(i);
2030 Node* pi_def = pi->in(idx);
2031 if (p0_def != pi_def) {
2032 return false;
2033 }
2034 }
2035 return true;
2036 }
2037
2038 //------------------------------profitable---------------------------
2039 // For pack p, are all operands and all uses (with in the block) vector?
2040 bool SuperWord::profitable(Node_List* p) {
2041 Node* p0 = p->at(0);
2042 uint start, end;
2043 VectorNode::vector_operands(p0, &start, &end);
2044
2045 // Return false if some inputs are not vectors or vectors with different
2046 // size or alignment.
2047 // Also, for now, return false if not scalar promotion case when inputs are
2048 // the same. Later, implement PackNode and allow differing, non-vector inputs
2049 // (maybe just the ones from outside the block.)
2050 for (uint i = start; i < end; i++) {
2051 if (!is_vector_use(p0, i)) {
2052 return false;
2053 }
2054 }
2055 // Check if reductions are connected
2056 if (p0->is_reduction()) {
2057 Node* second_in = p0->in(2);
2058 Node_List* second_pk = my_pack(second_in);
2059 if ((second_pk == NULL) || (_num_work_vecs == _num_reductions)) {
2060 // Remove reduction flag if no parent pack or if not enough work
2061 // to cover reduction expansion overhead
2062 p0->remove_flag(Node::Flag_is_reduction);
2063 return false;
2064 } else if (second_pk->size() != p->size()) {
2065 return false;
2066 }
2067 }
2068 if (VectorNode::is_shift(p0)) {
2069 // For now, return false if shift count is vector or not scalar promotion
2070 // case (different shift counts) because it is not supported yet.
2071 Node* cnt = p0->in(2);
2072 Node_List* cnt_pk = my_pack(cnt);
2073 if (cnt_pk != NULL)
2074 return false;
2075 if (!same_inputs(p, 2))
2076 return false;
2077 }
2078 if (!p0->is_Store()) {
2079 // For now, return false if not all uses are vector.
2080 // Later, implement ExtractNode and allow non-vector uses (maybe
2081 // just the ones outside the block.)
2082 for (uint i = 0; i < p->size(); i++) {
2083 Node* def = p->at(i);
2084 if (is_cmov_pack_internal_node(p, def)) {
2085 continue;
2086 }
2087 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) {
2088 Node* use = def->fast_out(j);
2089 for (uint k = 0; k < use->req(); k++) {
2090 Node* n = use->in(k);
2091 if (def == n) {
2092 // Reductions should only have a Phi use at the loop head or a non-phi use
2093 // outside of the loop if it is the last element of the pack (e.g. SafePoint).
2094 if (def->is_reduction() &&
2095 ((use->is_Phi() && use->in(0) == _lpt->_head) ||
2096 (!_lpt->is_member(_phase->get_loop(_phase->ctrl_or_self(use))) && i == p->size()-1))) {
2097 continue;
2098 }
2099 if (!is_vector_use(use, k)) {
2100 return false;
2101 }
2102 }
2103 }
2104 }
2105 }
2106 }
2107 return true;
2108 }
2109
2110 //------------------------------schedule---------------------------
2111 // Adjust the memory graph for the packed operations
2112 void SuperWord::schedule() {
2113
2114 // Co-locate in the memory graph the members of each memory pack
2115 for (int i = 0; i < _packset.length(); i++) {
2116 co_locate_pack(_packset.at(i));
2117 }
2118 }
2119
2120 //-------------------------------remove_and_insert-------------------
2121 // Remove "current" from its current position in the memory graph and insert
2122 // it after the appropriate insertion point (lip or uip).
2123 void SuperWord::remove_and_insert(MemNode *current, MemNode *prev, MemNode *lip,
2124 Node *uip, Unique_Node_List &sched_before) {
2125 Node* my_mem = current->in(MemNode::Memory);
2126 bool sched_up = sched_before.member(current);
2127
2128 // remove current_store from its current position in the memory graph
2129 for (DUIterator i = current->outs(); current->has_out(i); i++) {
2130 Node* use = current->out(i);
2131 if (use->is_Mem()) {
2132 assert(use->in(MemNode::Memory) == current, "must be");
2133 if (use == prev) { // connect prev to my_mem
2134 _igvn.replace_input_of(use, MemNode::Memory, my_mem);
2135 --i; //deleted this edge; rescan position
2136 } else if (sched_before.member(use)) {
2137 if (!sched_up) { // Will be moved together with current
2138 _igvn.replace_input_of(use, MemNode::Memory, uip);
2139 --i; //deleted this edge; rescan position
2140 }
2141 } else {
2142 if (sched_up) { // Will be moved together with current
2143 _igvn.replace_input_of(use, MemNode::Memory, lip);
2144 --i; //deleted this edge; rescan position
2145 }
2146 }
2147 }
2148 }
2149
2150 Node *insert_pt = sched_up ? uip : lip;
2151
2152 // all uses of insert_pt's memory state should use current's instead
2153 for (DUIterator i = insert_pt->outs(); insert_pt->has_out(i); i++) {
2154 Node* use = insert_pt->out(i);
2155 if (use->is_Mem()) {
2156 assert(use->in(MemNode::Memory) == insert_pt, "must be");
2157 _igvn.replace_input_of(use, MemNode::Memory, current);
2158 --i; //deleted this edge; rescan position
2159 } else if (!sched_up && use->is_Phi() && use->bottom_type() == Type::MEMORY) {
2160 uint pos; //lip (lower insert point) must be the last one in the memory slice
2161 for (pos=1; pos < use->req(); pos++) {
2162 if (use->in(pos) == insert_pt) break;
2163 }
2164 _igvn.replace_input_of(use, pos, current);
2165 --i;
2166 }
2167 }
2168
2169 //connect current to insert_pt
2170 _igvn.replace_input_of(current, MemNode::Memory, insert_pt);
2171 }
2172
2173 //------------------------------co_locate_pack----------------------------------
2174 // To schedule a store pack, we need to move any sandwiched memory ops either before
2175 // or after the pack, based upon dependence information:
2176 // (1) If any store in the pack depends on the sandwiched memory op, the
2177 // sandwiched memory op must be scheduled BEFORE the pack;
2178 // (2) If a sandwiched memory op depends on any store in the pack, the
2179 // sandwiched memory op must be scheduled AFTER the pack;
2180 // (3) If a sandwiched memory op (say, memA) depends on another sandwiched
2181 // memory op (say memB), memB must be scheduled before memA. So, if memA is
2182 // scheduled before the pack, memB must also be scheduled before the pack;
2183 // (4) If there is no dependence restriction for a sandwiched memory op, we simply
2184 // schedule this store AFTER the pack
2185 // (5) We know there is no dependence cycle, so there in no other case;
2186 // (6) Finally, all memory ops in another single pack should be moved in the same direction.
2187 //
2188 // To schedule a load pack, we use the memory state of either the first or the last load in
2189 // the pack, based on the dependence constraint.
2190 void SuperWord::co_locate_pack(Node_List* pk) {
2191 if (pk->at(0)->is_Store()) {
2192 MemNode* first = executed_first(pk)->as_Mem();
2193 MemNode* last = executed_last(pk)->as_Mem();
2194 Unique_Node_List schedule_before_pack;
2195 Unique_Node_List memops;
2196
2197 MemNode* current = last->in(MemNode::Memory)->as_Mem();
2198 MemNode* previous = last;
2199 while (true) {
2200 assert(in_bb(current), "stay in block");
2201 memops.push(previous);
2202 for (DUIterator i = current->outs(); current->has_out(i); i++) {
2203 Node* use = current->out(i);
2204 if (use->is_Mem() && use != previous)
2205 memops.push(use);
2206 }
2207 if (current == first) break;
2208 previous = current;
2209 current = current->in(MemNode::Memory)->as_Mem();
2210 }
2211
2212 // determine which memory operations should be scheduled before the pack
2213 for (uint i = 1; i < memops.size(); i++) {
2214 Node *s1 = memops.at(i);
2215 if (!in_pack(s1, pk) && !schedule_before_pack.member(s1)) {
2216 for (uint j = 0; j< i; j++) {
2217 Node *s2 = memops.at(j);
2218 if (!independent(s1, s2)) {
2219 if (in_pack(s2, pk) || schedule_before_pack.member(s2)) {
2220 schedule_before_pack.push(s1); // s1 must be scheduled before
2221 Node_List* mem_pk = my_pack(s1);
2222 if (mem_pk != NULL) {
2223 for (uint ii = 0; ii < mem_pk->size(); ii++) {
2224 Node* s = mem_pk->at(ii); // follow partner
2225 if (memops.member(s) && !schedule_before_pack.member(s))
2226 schedule_before_pack.push(s);
2227 }
2228 }
2229 break;
2230 }
2231 }
2232 }
2233 }
2234 }
2235
2236 Node* upper_insert_pt = first->in(MemNode::Memory);
2237 // Following code moves loads connected to upper_insert_pt below aliased stores.
2238 // Collect such loads here and reconnect them back to upper_insert_pt later.
2239 memops.clear();
2240 for (DUIterator i = upper_insert_pt->outs(); upper_insert_pt->has_out(i); i++) {
2241 Node* use = upper_insert_pt->out(i);
2242 if (use->is_Mem() && !use->is_Store()) {
2243 memops.push(use);
2244 }
2245 }
2246
2247 MemNode* lower_insert_pt = last;
2248 previous = last; //previous store in pk
2249 current = last->in(MemNode::Memory)->as_Mem();
2250
2251 // start scheduling from "last" to "first"
2252 while (true) {
2253 assert(in_bb(current), "stay in block");
2254 assert(in_pack(previous, pk), "previous stays in pack");
2255 Node* my_mem = current->in(MemNode::Memory);
2256
2257 if (in_pack(current, pk)) {
2258 // Forward users of my memory state (except "previous) to my input memory state
2259 for (DUIterator i = current->outs(); current->has_out(i); i++) {
2260 Node* use = current->out(i);
2261 if (use->is_Mem() && use != previous) {
2262 assert(use->in(MemNode::Memory) == current, "must be");
2263 if (schedule_before_pack.member(use)) {
2264 _igvn.replace_input_of(use, MemNode::Memory, upper_insert_pt);
2265 } else {
2266 _igvn.replace_input_of(use, MemNode::Memory, lower_insert_pt);
2267 }
2268 --i; // deleted this edge; rescan position
2269 }
2270 }
2271 previous = current;
2272 } else { // !in_pack(current, pk) ==> a sandwiched store
2273 remove_and_insert(current, previous, lower_insert_pt, upper_insert_pt, schedule_before_pack);
2274 }
2275
2276 if (current == first) break;
2277 current = my_mem->as_Mem();
2278 } // end while
2279
2280 // Reconnect loads back to upper_insert_pt.
2281 for (uint i = 0; i < memops.size(); i++) {
2282 Node *ld = memops.at(i);
2283 if (ld->in(MemNode::Memory) != upper_insert_pt) {
2284 _igvn.replace_input_of(ld, MemNode::Memory, upper_insert_pt);
2285 }
2286 }
2287 } else if (pk->at(0)->is_Load()) { // Load pack
2288 // All loads in the pack should have the same memory state. By default,
2289 // we use the memory state of the last load. However, if any load could
2290 // not be moved down due to the dependence constraint, we use the memory
2291 // state of the first load.
2292 Node* mem_input = pick_mem_state(pk);
2293 _igvn.hash_delete(mem_input);
2294 // Give each load the same memory state
2295 for (uint i = 0; i < pk->size(); i++) {
2296 LoadNode* ld = pk->at(i)->as_Load();
2297 _igvn.replace_input_of(ld, MemNode::Memory, mem_input);
2298 }
2299 }
2300 }
2301
2302 // Finds the first and last memory state and then picks either of them by checking dependence constraints.
2303 // If a store is dependent on an earlier load then we need to pick the memory state of the first load and cannot
2304 // pick the memory state of the last load.
2305 Node* SuperWord::pick_mem_state(Node_List* pk) {
2306 Node* first_mem = find_first_mem_state(pk);
2307 Node* last_mem = find_last_mem_state(pk, first_mem);
2308
2309 for (uint i = 0; i < pk->size(); i++) {
2310 Node* ld = pk->at(i);
2311 for (Node* current = last_mem; current != ld->in(MemNode::Memory); current = current->in(MemNode::Memory)) {
2312 assert(current->is_Mem() && in_bb(current), "unexpected memory");
2313 assert(current != first_mem, "corrupted memory graph");
2314 if (!independent(current, ld)) {
2315 // A later store depends on this load, pick the memory state of the first load. This can happen, for example,
2316 // if a load pack has interleaving stores that are part of a store pack which, however, is removed at the pack
2317 // filtering stage. This leaves us with only a load pack for which we cannot take the memory state of the
2318 // last load as the remaining unvectorized stores could interfere since they have a dependency to the loads.
2319 // Some stores could be executed before the load vector resulting in a wrong result. We need to take the
2320 // memory state of the first load to prevent this.
2321 return first_mem;
2322 }
2323 }
2324 }
2325 return last_mem;
2326 }
2327
2328 // Walk the memory graph from the current first load until the
2329 // start of the loop and check if nodes on the way are memory
2330 // edges of loads in the pack. The last one we encounter is the
2331 // first load.
2332 Node* SuperWord::find_first_mem_state(Node_List* pk) {
2333 Node* first_mem = pk->at(0)->in(MemNode::Memory);
2334 for (Node* current = first_mem; in_bb(current); current = current->is_Phi() ? current->in(LoopNode::EntryControl) : current->in(MemNode::Memory)) {
2335 assert(current->is_Mem() || (current->is_Phi() && current->in(0) == bb()), "unexpected memory");
2336 for (uint i = 1; i < pk->size(); i++) {
2337 Node* ld = pk->at(i);
2338 if (ld->in(MemNode::Memory) == current) {
2339 first_mem = current;
2340 break;
2341 }
2342 }
2343 }
2344 return first_mem;
2345 }
2346
2347 // Find the last load by going over the pack again and walking
2348 // the memory graph from the loads of the pack to the memory of
2349 // the first load. If we encounter the memory of the current last
2350 // load, then we started from further down in the memory graph and
2351 // the load we started from is the last load.
2352 Node* SuperWord::find_last_mem_state(Node_List* pk, Node* first_mem) {
2353 Node* last_mem = pk->at(0)->in(MemNode::Memory);
2354 for (uint i = 0; i < pk->size(); i++) {
2355 Node* ld = pk->at(i);
2356 for (Node* current = ld->in(MemNode::Memory); current != first_mem; current = current->in(MemNode::Memory)) {
2357 assert(current->is_Mem() && in_bb(current), "unexpected memory");
2358 if (current->in(MemNode::Memory) == last_mem) {
2359 last_mem = ld->in(MemNode::Memory);
2360 }
2361 }
2362 }
2363 return last_mem;
2364 }
2365
2366 #ifndef PRODUCT
2367 void SuperWord::print_loop(bool whole) {
2368 Node_Stack stack(_arena, _phase->C->unique() >> 2);
2369 Node_List rpo_list;
2370 VectorSet visited(_arena);
2371 visited.set(lpt()->_head->_idx);
2372 _phase->rpo(lpt()->_head, stack, visited, rpo_list);
2373 _phase->dump(lpt(), rpo_list.size(), rpo_list );
2374 if(whole) {
2375 tty->print_cr("\n Whole loop tree");
2376 _phase->dump();
2377 tty->print_cr(" End of whole loop tree\n");
2378 }
2379 }
2380 #endif
2381
2382 //------------------------------output---------------------------
2383 // Convert packs into vector node operations
2384 bool SuperWord::output() {
2385 CountedLoopNode *cl = lpt()->_head->as_CountedLoop();
2386 Compile* C = _phase->C;
2387 if (_packset.length() == 0) {
2388 return false;
2389 }
2390
2391 #ifndef PRODUCT
2392 if (TraceLoopOpts) {
2393 tty->print("SuperWord::output ");
2394 lpt()->dump_head();
2395 }
2396 #endif
2397
2398 if (cl->is_main_loop()) {
2399 // MUST ENSURE main loop's initial value is properly aligned:
2400 // (iv_initial_value + min_iv_offset) % vector_width_in_bytes() == 0
2401
2402 align_initial_loop_index(align_to_ref());
2403
2404 // Insert extract (unpack) operations for scalar uses
2405 for (int i = 0; i < _packset.length(); i++) {
2406 insert_extracts(_packset.at(i));
2407 }
2408 }
2409
2410 uint max_vlen_in_bytes = 0;
2411 uint max_vlen = 0;
2412
2413 NOT_PRODUCT(if(is_trace_loop_reverse()) {tty->print_cr("SWPointer::output: print loop before create_reserve_version_of_loop"); print_loop(true);})
2414
2415 CountedLoopReserveKit make_reversable(_phase, _lpt, do_reserve_copy());
2416
2417 NOT_PRODUCT(if(is_trace_loop_reverse()) {tty->print_cr("SWPointer::output: print loop after create_reserve_version_of_loop"); print_loop(true);})
2418
2419 if (do_reserve_copy() && !make_reversable.has_reserved()) {
2420 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("SWPointer::output: loop was not reserved correctly, exiting SuperWord");})
2421 return false;
2422 }
2423
2424 Node* vmask = NULL;
2425 if (cl->is_rce_post_loop() && do_reserve_copy()) {
2426 // Create a vector mask node for post loop, bail out if not created
2427 vmask = create_post_loop_vmask();
2428 if (vmask == NULL) {
2429 return false; // and reverse to backup IG
2430 }
2431 }
2432
2433 for (int i = 0; i < _block.length(); i++) {
2434 Node* n = _block.at(i);
2435 Node_List* p = my_pack(n);
2436 if (p && n == executed_last(p)) {
2437 uint vlen = p->size();
2438 uint vlen_in_bytes = 0;
2439 Node* vn = NULL;
2440 Node* low_adr = p->at(0);
2441 Node* first = executed_first(p);
2442 if (cl->is_rce_post_loop()) {
2443 // override vlen with the main loops vector length
2444 vlen = cl->slp_max_unroll();
2445 }
2446 NOT_PRODUCT(if(is_trace_cmov()) {tty->print_cr("SWPointer::output: %d executed first, %d executed last in pack", first->_idx, n->_idx); print_pack(p);})
2447 int opc = n->Opcode();
2448 if (n->is_Load()) {
2449 Node* ctl = n->in(MemNode::Control);
2450 Node* mem = first->in(MemNode::Memory);
2451 SWPointer p1(n->as_Mem(), this, NULL, false);
2452 // Identify the memory dependency for the new loadVector node by
2453 // walking up through memory chain.
2454 // This is done to give flexibility to the new loadVector node so that
2455 // it can move above independent storeVector nodes.
2456 while (mem->is_StoreVector()) {
2457 SWPointer p2(mem->as_Mem(), this, NULL, false);
2458 int cmp = p1.cmp(p2);
2459 if (SWPointer::not_equal(cmp) || !SWPointer::comparable(cmp)) {
2460 mem = mem->in(MemNode::Memory);
2461 } else {
2462 break; // dependent memory
2463 }
2464 }
2465 Node* adr = low_adr->in(MemNode::Address);
2466 const TypePtr* atyp = n->adr_type();
2467 if (cl->is_rce_post_loop()) {
2468 assert(vmask != NULL, "vector mask should be generated");
2469 const TypeVect* vt = TypeVect::make(velt_basic_type(n), vlen);
2470 vn = new LoadVectorMaskedNode(ctl, mem, adr, atyp, vt, vmask);
2471 } else {
2472 vn = LoadVectorNode::make(opc, ctl, mem, adr, atyp, vlen, velt_basic_type(n), control_dependency(p));
2473 }
2474 vlen_in_bytes = vn->as_LoadVector()->memory_size();
2475 } else if (n->is_Store()) {
2476 // Promote value to be stored to vector
2477 Node* val = vector_opd(p, MemNode::ValueIn);
2478 if (val == NULL) {
2479 if (do_reserve_copy()) {
2480 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("SWPointer::output: val should not be NULL, exiting SuperWord");})
2481 return false; //and reverse to backup IG
2482 }
2483 ShouldNotReachHere();
2484 }
2485
2486 Node* ctl = n->in(MemNode::Control);
2487 Node* mem = first->in(MemNode::Memory);
2488 Node* adr = low_adr->in(MemNode::Address);
2489 const TypePtr* atyp = n->adr_type();
2490 if (cl->is_rce_post_loop()) {
2491 assert(vmask != NULL, "vector mask should be generated");
2492 const TypeVect* vt = TypeVect::make(velt_basic_type(n), vlen);
2493 vn = new StoreVectorMaskedNode(ctl, mem, adr, val, atyp, vmask);
2494 } else {
2495 vn = StoreVectorNode::make(opc, ctl, mem, adr, atyp, val, vlen);
2496 }
2497 vlen_in_bytes = vn->as_StoreVector()->memory_size();
2498 } else if (VectorNode::is_scalar_rotate(n)) {
2499 Node* in1 = low_adr->in(1);
2500 Node* in2 = p->at(0)->in(2);
2501 // If rotation count is non-constant or greater than 8bit value create a vector.
2502 if (!in2->is_Con() || !Matcher::supports_vector_constant_rotates(in2->get_int())) {
2503 in2 = vector_opd(p, 2);
2504 }
2505 vn = VectorNode::make(opc, in1, in2, vlen, velt_basic_type(n));
2506 vlen_in_bytes = vn->as_Vector()->length_in_bytes();
2507 } else if (VectorNode::is_roundopD(n)) {
2508 Node* in1 = vector_opd(p, 1);
2509 Node* in2 = low_adr->in(2);
2510 assert(in2->is_Con(), "Constant rounding mode expected.");
2511 vn = VectorNode::make(opc, in1, in2, vlen, velt_basic_type(n));
2512 vlen_in_bytes = vn->as_Vector()->length_in_bytes();
2513 } else if (VectorNode::is_muladds2i(n)) {
2514 assert(n->req() == 5u, "MulAddS2I should have 4 operands.");
2515 Node* in1 = vector_opd(p, 1);
2516 Node* in2 = vector_opd(p, 2);
2517 vn = VectorNode::make(opc, in1, in2, vlen, velt_basic_type(n));
2518 vlen_in_bytes = vn->as_Vector()->length_in_bytes();
2519 } else if (n->req() == 3 && !is_cmov_pack(p)) {
2520 // Promote operands to vector
2521 Node* in1 = NULL;
2522 bool node_isa_reduction = n->is_reduction();
2523 if (node_isa_reduction) {
2524 // the input to the first reduction operation is retained
2525 in1 = low_adr->in(1);
2526 } else {
2527 in1 = vector_opd(p, 1);
2528 if (in1 == NULL) {
2529 if (do_reserve_copy()) {
2530 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("SWPointer::output: in1 should not be NULL, exiting SuperWord");})
2531 return false; //and reverse to backup IG
2532 }
2533 ShouldNotReachHere();
2534 }
2535 }
2536 Node* in2 = vector_opd(p, 2);
2537 if (in2 == NULL) {
2538 if (do_reserve_copy()) {
2539 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("SWPointer::output: in2 should not be NULL, exiting SuperWord");})
2540 return false; //and reverse to backup IG
2541 }
2542 ShouldNotReachHere();
2543 }
2544 if (VectorNode::is_invariant_vector(in1) && (node_isa_reduction == false) && (n->is_Add() || n->is_Mul())) {
2545 // Move invariant vector input into second position to avoid register spilling.
2546 Node* tmp = in1;
2547 in1 = in2;
2548 in2 = tmp;
2549 }
2550 if (node_isa_reduction) {
2551 const Type *arith_type = n->bottom_type();
2552 vn = ReductionNode::make(opc, NULL, in1, in2, arith_type->basic_type());
2553 if (in2->is_Load()) {
2554 vlen_in_bytes = in2->as_LoadVector()->memory_size();
2555 } else {
2556 vlen_in_bytes = in2->as_Vector()->length_in_bytes();
2557 }
2558 } else {
2559 vn = VectorNode::make(opc, in1, in2, vlen, velt_basic_type(n));
2560 vlen_in_bytes = vn->as_Vector()->length_in_bytes();
2561 }
2562 } else if (opc == Op_SqrtF || opc == Op_SqrtD ||
2563 opc == Op_AbsF || opc == Op_AbsD ||
2564 opc == Op_AbsI || opc == Op_AbsL ||
2565 opc == Op_NegF || opc == Op_NegD ||
2566 opc == Op_RoundF || opc == Op_RoundD ||
2567 opc == Op_PopCountI || opc == Op_PopCountL) {
2568 assert(n->req() == 2, "only one input expected");
2569 Node* in = vector_opd(p, 1);
2570 vn = VectorNode::make(opc, in, NULL, vlen, velt_basic_type(n));
2571 vlen_in_bytes = vn->as_Vector()->length_in_bytes();
2572 } else if (opc == Op_ConvI2F || opc == Op_ConvL2D ||
2573 opc == Op_ConvF2I || opc == Op_ConvD2L) {
2574 assert(n->req() == 2, "only one input expected");
2575 BasicType bt = velt_basic_type(n);
2576 int vopc = VectorNode::opcode(opc, bt);
2577 Node* in = vector_opd(p, 1);
2578 vn = VectorCastNode::make(vopc, in, bt, vlen);
2579 vlen_in_bytes = vn->as_Vector()->length_in_bytes();
2580 } else if (is_cmov_pack(p)) {
2581 if (cl->is_rce_post_loop()) {
2582 // do not refactor of flow in post loop context
2583 return false;
2584 }
2585 if (!n->is_CMove()) {
2586 continue;
2587 }
2588 // place here CMoveVDNode
2589 NOT_PRODUCT(if(is_trace_cmov()) {tty->print_cr("SWPointer::output: print before CMove vectorization"); print_loop(false);})
2590 Node* bol = n->in(CMoveNode::Condition);
2591 if (!bol->is_Bool() && bol->Opcode() == Op_ExtractI && bol->req() > 1 ) {
2592 NOT_PRODUCT(if(is_trace_cmov()) {tty->print_cr("SWPointer::output: %d is not Bool node, trying its in(1) node %d", bol->_idx, bol->in(1)->_idx); bol->dump(); bol->in(1)->dump();})
2593 bol = bol->in(1); //may be ExtractNode
2594 }
2595
2596 assert(bol->is_Bool(), "should be BoolNode - too late to bail out!");
2597 if (!bol->is_Bool()) {
2598 if (do_reserve_copy()) {
2599 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("SWPointer::output: expected %d bool node, exiting SuperWord", bol->_idx); bol->dump();})
2600 return false; //and reverse to backup IG
2601 }
2602 ShouldNotReachHere();
2603 }
2604
2605 int cond = (int)bol->as_Bool()->_test._test;
2606 Node* in_cc = _igvn.intcon(cond);
2607 NOT_PRODUCT(if(is_trace_cmov()) {tty->print("SWPointer::output: created intcon in_cc node %d", in_cc->_idx); in_cc->dump();})
2608 Node* cc = bol->clone();
2609 cc->set_req(1, in_cc);
2610 NOT_PRODUCT(if(is_trace_cmov()) {tty->print("SWPointer::output: created bool cc node %d", cc->_idx); cc->dump();})
2611
2612 Node* src1 = vector_opd(p, 2); //2=CMoveNode::IfFalse
2613 if (src1 == NULL) {
2614 if (do_reserve_copy()) {
2615 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("SWPointer::output: src1 should not be NULL, exiting SuperWord");})
2616 return false; //and reverse to backup IG
2617 }
2618 ShouldNotReachHere();
2619 }
2620 Node* src2 = vector_opd(p, 3); //3=CMoveNode::IfTrue
2621 if (src2 == NULL) {
2622 if (do_reserve_copy()) {
2623 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("SWPointer::output: src2 should not be NULL, exiting SuperWord");})
2624 return false; //and reverse to backup IG
2625 }
2626 ShouldNotReachHere();
2627 }
2628 BasicType bt = velt_basic_type(n);
2629 const TypeVect* vt = TypeVect::make(bt, vlen);
2630 assert(bt == T_FLOAT || bt == T_DOUBLE, "Only vectorization for FP cmovs is supported");
2631 if (bt == T_FLOAT) {
2632 vn = new CMoveVFNode(cc, src1, src2, vt);
2633 } else {
2634 assert(bt == T_DOUBLE, "Expected double");
2635 vn = new CMoveVDNode(cc, src1, src2, vt);
2636 }
2637 NOT_PRODUCT(if(is_trace_cmov()) {tty->print("SWPointer::output: created new CMove node %d: ", vn->_idx); vn->dump();})
2638 } else if (opc == Op_FmaD || opc == Op_FmaF) {
2639 // Promote operands to vector
2640 Node* in1 = vector_opd(p, 1);
2641 Node* in2 = vector_opd(p, 2);
2642 Node* in3 = vector_opd(p, 3);
2643 vn = VectorNode::make(opc, in1, in2, in3, vlen, velt_basic_type(n));
2644 vlen_in_bytes = vn->as_Vector()->length_in_bytes();
2645 } else {
2646 if (do_reserve_copy()) {
2647 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("SWPointer::output: ShouldNotReachHere, exiting SuperWord");})
2648 return false; //and reverse to backup IG
2649 }
2650 ShouldNotReachHere();
2651 }
2652
2653 assert(vn != NULL, "sanity");
2654 if (vn == NULL) {
2655 if (do_reserve_copy()){
2656 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("SWPointer::output: got NULL node, cannot proceed, exiting SuperWord");})
2657 return false; //and reverse to backup IG
2658 }
2659 ShouldNotReachHere();
2660 }
2661
2662 _block.at_put(i, vn);
2663 _igvn.register_new_node_with_optimizer(vn);
2664 _phase->set_ctrl(vn, _phase->get_ctrl(p->at(0)));
2665 for (uint j = 0; j < p->size(); j++) {
2666 Node* pm = p->at(j);
2667 _igvn.replace_node(pm, vn);
2668 }
2669 _igvn._worklist.push(vn);
2670
2671 if (vlen > max_vlen) {
2672 max_vlen = vlen;
2673 }
2674 if (vlen_in_bytes > max_vlen_in_bytes) {
2675 max_vlen_in_bytes = vlen_in_bytes;
2676 }
2677 #ifdef ASSERT
2678 if (TraceNewVectors) {
2679 tty->print("new Vector node: ");
2680 vn->dump();
2681 }
2682 #endif
2683 }
2684 }//for (int i = 0; i < _block.length(); i++)
2685
2686 if (max_vlen_in_bytes > C->max_vector_size()) {
2687 C->set_max_vector_size(max_vlen_in_bytes);
2688 }
2689 if (max_vlen_in_bytes > 0) {
2690 cl->mark_loop_vectorized();
2691 }
2692
2693 if (SuperWordLoopUnrollAnalysis) {
2694 if (cl->has_passed_slp()) {
2695 uint slp_max_unroll_factor = cl->slp_max_unroll();
2696 if (slp_max_unroll_factor == max_vlen) {
2697 if (TraceSuperWordLoopUnrollAnalysis) {
2698 tty->print_cr("vector loop(unroll=%d, len=%d)\n", max_vlen, max_vlen_in_bytes*BitsPerByte);
2699 }
2700
2701 // For atomic unrolled loops which are vector mapped, instigate more unrolling
2702 cl->set_notpassed_slp();
2703 if (cl->is_main_loop()) {
2704 // if vector resources are limited, do not allow additional unrolling, also
2705 // do not unroll more on pure vector loops which were not reduced so that we can
2706 // program the post loop to single iteration execution.
2707 if (Matcher::float_pressure_limit() > 8) {
2708 C->set_major_progress();
2709 cl->mark_do_unroll_only();
2710 }
2711 }
2712 if (cl->is_rce_post_loop() && do_reserve_copy()) {
2713 cl->mark_is_multiversioned();
2714 }
2715 }
2716 }
2717 }
2718
2719 if (do_reserve_copy()) {
2720 make_reversable.use_new();
2721 }
2722 NOT_PRODUCT(if(is_trace_loop_reverse()) {tty->print_cr("\n Final loop after SuperWord"); print_loop(true);})
2723 return true;
2724 }
2725
2726 //-------------------------create_post_loop_vmask-------------------------
2727 // Check the post loop vectorizability and create a vector mask if yes.
2728 // Return NULL to bail out if post loop is not vectorizable.
2729 Node* SuperWord::create_post_loop_vmask() {
2730 CountedLoopNode *cl = lpt()->_head->as_CountedLoop();
2731 assert(cl->is_rce_post_loop(), "Must be an rce post loop");
2732 assert(!cl->is_reduction_loop(), "no vector reduction in post loop");
2733 assert(abs(cl->stride_con()) == 1, "post loop stride can only be +/-1");
2734
2735 // Collect vector element types of all post loop packs. Also collect
2736 // superword pointers of each memory access operation if the address
2737 // expression is supported. (Note that vectorizable post loop should
2738 // only have positive scale in counting-up loop and negative scale in
2739 // counting-down loop.) Collected SWPointer(s) are also used for data
2740 // dependence check next.
2741 VectorElementSizeStats stats(_arena);
2742 GrowableArray<SWPointer*> swptrs(_arena, _packset.length(), 0, NULL);
2743 for (int i = 0; i < _packset.length(); i++) {
2744 Node_List* p = _packset.at(i);
2745 assert(p->size() == 1, "all post loop packs should be singleton");
2746 Node* n = p->at(0);
2747 BasicType bt = velt_basic_type(n);
2748 if (!is_java_primitive(bt)) {
2749 return NULL;
2750 }
2751 if (n->is_Mem()) {
2752 SWPointer* mem_p = new (_arena) SWPointer(n->as_Mem(), this, NULL, false);
2753 // For each memory access, we check if the scale (in bytes) in its
2754 // address expression is equal to the data size times loop stride.
2755 // With this, Only positive scales exist in counting-up loops and
2756 // negative scales exist in counting-down loops.
2757 if (mem_p->scale_in_bytes() != type2aelembytes(bt) * cl->stride_con()) {
2758 return NULL;
2759 }
2760 swptrs.append(mem_p);
2761 }
2762 stats.record_size(type2aelembytes(bt));
2763 }
2764
2765 // Find the vector data type for generating vector masks. Currently we
2766 // don't support post loops with mixed vector data sizes
2767 int unique_size = stats.unique_size();
2768 BasicType vmask_bt;
2769 switch (unique_size) {
2770 case 1: vmask_bt = T_BYTE; break;
2771 case 2: vmask_bt = T_SHORT; break;
2772 case 4: vmask_bt = T_INT; break;
2773 case 8: vmask_bt = T_LONG; break;
2774 default: return NULL;
2775 }
2776
2777 // Currently we can't remove this MaxVectorSize constraint. Without it,
2778 // it's not guaranteed that the RCE'd post loop runs at most "vlen - 1"
2779 // iterations, because the vector drain loop may not be cloned from the
2780 // vectorized main loop. We should re-engineer PostLoopMultiversioning
2781 // to fix this problem.
2782 int vlen = cl->slp_max_unroll();
2783 if (unique_size * vlen != MaxVectorSize) {
2784 return NULL;
2785 }
2786
2787 // Bail out if target doesn't support mask generator or masked load/store
2788 if (!Matcher::match_rule_supported_vector(Op_LoadVectorMasked, vlen, vmask_bt) ||
2789 !Matcher::match_rule_supported_vector(Op_StoreVectorMasked, vlen, vmask_bt) ||
2790 !Matcher::match_rule_supported_vector(Op_VectorMaskGen, vlen, vmask_bt)) {
2791 return NULL;
2792 }
2793
2794 // Bail out if potential data dependence exists between memory accesses
2795 if (SWPointer::has_potential_dependence(swptrs)) {
2796 return NULL;
2797 }
2798
2799 // Create vector mask with the post loop trip count. Note there's another
2800 // vector drain loop which is cloned from main loop before super-unrolling
2801 // so the scalar post loop runs at most vlen-1 trips. Hence, this version
2802 // only runs at most 1 iteration after vector mask transformation.
2803 Node* trip_cnt;
2804 Node* new_incr;
2805 if (cl->stride_con() > 0) {
2806 trip_cnt = new SubINode(cl->limit(), cl->init_trip());
2807 new_incr = new AddINode(cl->phi(), trip_cnt);
2808 } else {
2809 trip_cnt = new SubINode(cl->init_trip(), cl->limit());
2810 new_incr = new SubINode(cl->phi(), trip_cnt);
2811 }
2812 _igvn.register_new_node_with_optimizer(trip_cnt);
2813 _igvn.register_new_node_with_optimizer(new_incr);
2814 _igvn.replace_node(cl->incr(), new_incr);
2815 Node* length = new ConvI2LNode(trip_cnt);
2816 _igvn.register_new_node_with_optimizer(length);
2817 Node* vmask = VectorMaskGenNode::make(length, vmask_bt);
2818 _igvn.register_new_node_with_optimizer(vmask);
2819
2820 // Remove exit test to transform 1-iteration loop to straight-line code.
2821 // This results in redundant cmp+branch instructions been eliminated.
2822 Node *cl_exit = cl->loopexit();
2823 _igvn.replace_input_of(cl_exit, 1, _igvn.intcon(0));
2824 return vmask;
2825 }
2826
2827 //------------------------------vector_opd---------------------------
2828 // Create a vector operand for the nodes in pack p for operand: in(opd_idx)
2829 Node* SuperWord::vector_opd(Node_List* p, int opd_idx) {
2830 Node* p0 = p->at(0);
2831 uint vlen = p->size();
2832 Node* opd = p0->in(opd_idx);
2833 CountedLoopNode *cl = lpt()->_head->as_CountedLoop();
2834
2835 if (cl->is_rce_post_loop()) {
2836 // override vlen with the main loops vector length
2837 vlen = cl->slp_max_unroll();
2838 }
2839
2840 if (same_inputs(p, opd_idx)) {
2841 if (opd->is_Vector() || opd->is_LoadVector()) {
2842 assert(((opd_idx != 2) || !VectorNode::is_shift(p0)), "shift's count can't be vector");
2843 if (opd_idx == 2 && VectorNode::is_shift(p0)) {
2844 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("shift's count can't be vector");})
2845 return NULL;
2846 }
2847 return opd; // input is matching vector
2848 }
2849 if ((opd_idx == 2) && VectorNode::is_shift(p0)) {
2850 Compile* C = _phase->C;
2851 Node* cnt = opd;
2852 // Vector instructions do not mask shift count, do it here.
2853 juint mask = (p0->bottom_type() == TypeInt::INT) ? (BitsPerInt - 1) : (BitsPerLong - 1);
2854 const TypeInt* t = opd->find_int_type();
2855 if (t != NULL && t->is_con()) {
2856 juint shift = t->get_con();
2857 if (shift > mask) { // Unsigned cmp
2858 cnt = ConNode::make(TypeInt::make(shift & mask));
2859 }
2860 } else {
2861 if (t == NULL || t->_lo < 0 || t->_hi > (int)mask) {
2862 cnt = ConNode::make(TypeInt::make(mask));
2863 _igvn.register_new_node_with_optimizer(cnt);
2864 cnt = new AndINode(opd, cnt);
2865 _igvn.register_new_node_with_optimizer(cnt);
2866 _phase->set_ctrl(cnt, _phase->get_ctrl(opd));
2867 }
2868 assert(opd->bottom_type()->isa_int(), "int type only");
2869 if (!opd->bottom_type()->isa_int()) {
2870 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("Should be int type only");})
2871 return NULL;
2872 }
2873 }
2874 // Move shift count into vector register.
2875 cnt = VectorNode::shift_count(p0->Opcode(), cnt, vlen, velt_basic_type(p0));
2876 _igvn.register_new_node_with_optimizer(cnt);
2877 _phase->set_ctrl(cnt, _phase->get_ctrl(opd));
2878 return cnt;
2879 }
2880 assert(!opd->is_StoreVector(), "such vector is not expected here");
2881 if (opd->is_StoreVector()) {
2882 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("StoreVector is not expected here");})
2883 return NULL;
2884 }
2885 // Convert scalar input to vector with the same number of elements as
2886 // p0's vector. Use p0's type because size of operand's container in
2887 // vector should match p0's size regardless operand's size.
2888 const Type* p0_t = NULL;
2889 VectorNode* vn = NULL;
2890 if (opd_idx == 2 && VectorNode::is_scalar_rotate(p0)) {
2891 Node* conv = opd;
2892 p0_t = TypeInt::INT;
2893 if (p0->bottom_type()->isa_long()) {
2894 p0_t = TypeLong::LONG;
2895 conv = new ConvI2LNode(opd);
2896 _igvn.register_new_node_with_optimizer(conv);
2897 _phase->set_ctrl(conv, _phase->get_ctrl(opd));
2898 }
2899 vn = VectorNode::scalar2vector(conv, vlen, p0_t);
2900 } else {
2901 p0_t = velt_type(p0);
2902 vn = VectorNode::scalar2vector(opd, vlen, p0_t);
2903 }
2904
2905 _igvn.register_new_node_with_optimizer(vn);
2906 _phase->set_ctrl(vn, _phase->get_ctrl(opd));
2907 #ifdef ASSERT
2908 if (TraceNewVectors) {
2909 tty->print("new Vector node: ");
2910 vn->dump();
2911 }
2912 #endif
2913 return vn;
2914 }
2915
2916 // Insert pack operation
2917 BasicType bt = velt_basic_type(p0);
2918 PackNode* pk = PackNode::make(opd, vlen, bt);
2919 DEBUG_ONLY( const BasicType opd_bt = opd->bottom_type()->basic_type(); )
2920
2921 for (uint i = 1; i < vlen; i++) {
2922 Node* pi = p->at(i);
2923 Node* in = pi->in(opd_idx);
2924 assert(my_pack(in) == NULL, "Should already have been unpacked");
2925 if (my_pack(in) != NULL) {
2926 NOT_PRODUCT(if(is_trace_loop_reverse() || TraceLoopOpts) {tty->print_cr("Should already have been unpacked");})
2927 return NULL;
2928 }
2929 assert(opd_bt == in->bottom_type()->basic_type(), "all same type");
2930 pk->add_opd(in);
2931 if (VectorNode::is_muladds2i(pi)) {
2932 Node* in2 = pi->in(opd_idx + 2);
2933 assert(my_pack(in2) == NULL, "Should already have been unpacked");
2934 if (my_pack(in2) != NULL) {
2935 NOT_PRODUCT(if (is_trace_loop_reverse() || TraceLoopOpts) { tty->print_cr("Should already have been unpacked"); })
2936 return NULL;
2937 }
2938 assert(opd_bt == in2->bottom_type()->basic_type(), "all same type");
2939 pk->add_opd(in2);
2940 }
2941 }
2942 _igvn.register_new_node_with_optimizer(pk);
2943 _phase->set_ctrl(pk, _phase->get_ctrl(opd));
2944 #ifdef ASSERT
2945 if (TraceNewVectors) {
2946 tty->print("new Vector node: ");
2947 pk->dump();
2948 }
2949 #endif
2950 return pk;
2951 }
2952
2953 //------------------------------insert_extracts---------------------------
2954 // If a use of pack p is not a vector use, then replace the
2955 // use with an extract operation.
2956 void SuperWord::insert_extracts(Node_List* p) {
2957 if (p->at(0)->is_Store()) return;
2958 assert(_n_idx_list.is_empty(), "empty (node,index) list");
2959
2960 // Inspect each use of each pack member. For each use that is
2961 // not a vector use, replace the use with an extract operation.
2962
2963 for (uint i = 0; i < p->size(); i++) {
2964 Node* def = p->at(i);
2965 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) {
2966 Node* use = def->fast_out(j);
2967 for (uint k = 0; k < use->req(); k++) {
2968 Node* n = use->in(k);
2969 if (def == n) {
2970 Node_List* u_pk = my_pack(use);
2971 if ((u_pk == NULL || !is_cmov_pack(u_pk) || use->is_CMove()) && !is_vector_use(use, k)) {
2972 _n_idx_list.push(use, k);
2973 }
2974 }
2975 }
2976 }
2977 }
2978
2979 while (_n_idx_list.is_nonempty()) {
2980 Node* use = _n_idx_list.node();
2981 int idx = _n_idx_list.index();
2982 _n_idx_list.pop();
2983 Node* def = use->in(idx);
2984
2985 if (def->is_reduction()) continue;
2986
2987 // Insert extract operation
2988 _igvn.hash_delete(def);
2989 int def_pos = alignment(def) / data_size(def);
2990
2991 Node* ex = ExtractNode::make(def, def_pos, velt_basic_type(def));
2992 _igvn.register_new_node_with_optimizer(ex);
2993 _phase->set_ctrl(ex, _phase->get_ctrl(def));
2994 _igvn.replace_input_of(use, idx, ex);
2995 _igvn._worklist.push(def);
2996
2997 bb_insert_after(ex, bb_idx(def));
2998 set_velt_type(ex, velt_type(def));
2999 }
3000 }
3001
3002 //------------------------------is_vector_use---------------------------
3003 // Is use->in(u_idx) a vector use?
3004 bool SuperWord::is_vector_use(Node* use, int u_idx) {
3005 Node_List* u_pk = my_pack(use);
3006 if (u_pk == NULL) return false;
3007 if (use->is_reduction()) return true;
3008 Node* def = use->in(u_idx);
3009 Node_List* d_pk = my_pack(def);
3010 if (d_pk == NULL) {
3011 // check for scalar promotion
3012 Node* n = u_pk->at(0)->in(u_idx);
3013 for (uint i = 1; i < u_pk->size(); i++) {
3014 if (u_pk->at(i)->in(u_idx) != n) return false;
3015 }
3016 return true;
3017 }
3018
3019 if (VectorNode::is_muladds2i(use)) {
3020 // MulAddS2I takes shorts and produces ints - hence the special checks
3021 // on alignment and size.
3022 if (u_pk->size() * 2 != d_pk->size()) {
3023 return false;
3024 }
3025 for (uint i = 0; i < MIN2(d_pk->size(), u_pk->size()); i++) {
3026 Node* ui = u_pk->at(i);
3027 Node* di = d_pk->at(i);
3028 if (alignment(ui) != alignment(di) * 2) {
3029 return false;
3030 }
3031 }
3032 return true;
3033 }
3034
3035 if (VectorNode::is_vpopcnt_long(use)) {
3036 // VPOPCNT_LONG takes long and produces int - hence the special checks
3037 // on alignment and size.
3038 if (u_pk->size() != d_pk->size()) {
3039 return false;
3040 }
3041 for (uint i = 0; i < MIN2(d_pk->size(), u_pk->size()); i++) {
3042 Node* ui = u_pk->at(i);
3043 Node* di = d_pk->at(i);
3044 if (alignment(ui) * 2 != alignment(di)) {
3045 return false;
3046 }
3047 }
3048 return true;
3049 }
3050
3051
3052 if (u_pk->size() != d_pk->size())
3053 return false;
3054 for (uint i = 0; i < u_pk->size(); i++) {
3055 Node* ui = u_pk->at(i);
3056 Node* di = d_pk->at(i);
3057 if (ui->in(u_idx) != di || alignment(ui) != alignment(di))
3058 return false;
3059 }
3060 return true;
3061 }
3062
3063 //------------------------------construct_bb---------------------------
3064 // Construct reverse postorder list of block members
3065 bool SuperWord::construct_bb() {
3066 Node* entry = bb();
3067
3068 assert(_stk.length() == 0, "stk is empty");
3069 assert(_block.length() == 0, "block is empty");
3070 assert(_data_entry.length() == 0, "data_entry is empty");
3071 assert(_mem_slice_head.length() == 0, "mem_slice_head is empty");
3072 assert(_mem_slice_tail.length() == 0, "mem_slice_tail is empty");
3073
3074 // Find non-control nodes with no inputs from within block,
3075 // create a temporary map from node _idx to bb_idx for use
3076 // by the visited and post_visited sets,
3077 // and count number of nodes in block.
3078 int bb_ct = 0;
3079 for (uint i = 0; i < lpt()->_body.size(); i++) {
3080 Node *n = lpt()->_body.at(i);
3081 set_bb_idx(n, i); // Create a temporary map
3082 if (in_bb(n)) {
3083 if (n->is_LoadStore() || n->is_MergeMem() ||
3084 (n->is_Proj() && !n->as_Proj()->is_CFG())) {
3085 // Bailout if the loop has LoadStore, MergeMem or data Proj
3086 // nodes. Superword optimization does not work with them.
3087 return false;
3088 }
3089 bb_ct++;
3090 if (!n->is_CFG()) {
3091 bool found = false;
3092 for (uint j = 0; j < n->req(); j++) {
3093 Node* def = n->in(j);
3094 if (def && in_bb(def)) {
3095 found = true;
3096 break;
3097 }
3098 }
3099 if (!found) {
3100 assert(n != entry, "can't be entry");
3101 _data_entry.push(n);
3102 }
3103 }
3104 }
3105 }
3106
3107 // Find memory slices (head and tail)
3108 for (DUIterator_Fast imax, i = lp()->fast_outs(imax); i < imax; i++) {
3109 Node *n = lp()->fast_out(i);
3110 if (in_bb(n) && (n->is_Phi() && n->bottom_type() == Type::MEMORY)) {
3111 Node* n_tail = n->in(LoopNode::LoopBackControl);
3112 if (n_tail != n->in(LoopNode::EntryControl)) {
3113 if (!n_tail->is_Mem()) {
3114 assert(n_tail->is_Mem(), "unexpected node for memory slice: %s", n_tail->Name());
3115 return false; // Bailout
3116 }
3117 _mem_slice_head.push(n);
3118 _mem_slice_tail.push(n_tail);
3119 }
3120 }
3121 }
3122
3123 // Create an RPO list of nodes in block
3124
3125 visited_clear();
3126 post_visited_clear();
3127
3128 // Push all non-control nodes with no inputs from within block, then control entry
3129 for (int j = 0; j < _data_entry.length(); j++) {
3130 Node* n = _data_entry.at(j);
3131 visited_set(n);
3132 _stk.push(n);
3133 }
3134 visited_set(entry);
3135 _stk.push(entry);
3136
3137 // Do a depth first walk over out edges
3138 int rpo_idx = bb_ct - 1;
3139 int size;
3140 int reduction_uses = 0;
3141 while ((size = _stk.length()) > 0) {
3142 Node* n = _stk.top(); // Leave node on stack
3143 if (!visited_test_set(n)) {
3144 // forward arc in graph
3145 } else if (!post_visited_test(n)) {
3146 // cross or back arc
3147 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
3148 Node *use = n->fast_out(i);
3149 if (in_bb(use) && !visited_test(use) &&
3150 // Don't go around backedge
3151 (!use->is_Phi() || n == entry)) {
3152 if (use->is_reduction()) {
3153 // First see if we can map the reduction on the given system we are on, then
3154 // make a data entry operation for each reduction we see.
3155 BasicType bt = use->bottom_type()->basic_type();
3156 if (ReductionNode::implemented(use->Opcode(), Matcher::min_vector_size(bt), bt)) {
3157 reduction_uses++;
3158 }
3159 }
3160 _stk.push(use);
3161 }
3162 }
3163 if (_stk.length() == size) {
3164 // There were no additional uses, post visit node now
3165 _stk.pop(); // Remove node from stack
3166 assert(rpo_idx >= 0, "");
3167 _block.at_put_grow(rpo_idx, n);
3168 rpo_idx--;
3169 post_visited_set(n);
3170 assert(rpo_idx >= 0 || _stk.is_empty(), "");
3171 }
3172 } else {
3173 _stk.pop(); // Remove post-visited node from stack
3174 }
3175 }//while
3176
3177 int ii_current = -1;
3178 unsigned int load_idx = (unsigned int)-1;
3179 // Build iterations order if needed
3180 bool build_ii_order = _do_vector_loop_experimental && _ii_order.is_empty();
3181 // Create real map of block indices for nodes
3182 for (int j = 0; j < _block.length(); j++) {
3183 Node* n = _block.at(j);
3184 set_bb_idx(n, j);
3185 if (build_ii_order && n->is_Load()) {
3186 if (ii_current == -1) {
3187 ii_current = _clone_map.gen(n->_idx);
3188 _ii_order.push(ii_current);
3189 load_idx = _clone_map.idx(n->_idx);
3190 } else if (_clone_map.idx(n->_idx) == load_idx && _clone_map.gen(n->_idx) != ii_current) {
3191 ii_current = _clone_map.gen(n->_idx);
3192 _ii_order.push(ii_current);
3193 }
3194 }
3195 }//for
3196
3197 // Ensure extra info is allocated.
3198 initialize_bb();
3199
3200 #ifndef PRODUCT
3201 if (_vector_loop_debug && _ii_order.length() > 0) {
3202 tty->print("SuperWord::construct_bb: List of generations: ");
3203 for (int jj = 0; jj < _ii_order.length(); ++jj) {
3204 tty->print(" %d:%d", jj, _ii_order.at(jj));
3205 }
3206 tty->print_cr(" ");
3207 }
3208 if (TraceSuperWord) {
3209 print_bb();
3210 tty->print_cr("\ndata entry nodes: %s", _data_entry.length() > 0 ? "" : "NONE");
3211 for (int m = 0; m < _data_entry.length(); m++) {
3212 tty->print("%3d ", m);
3213 _data_entry.at(m)->dump();
3214 }
3215 tty->print_cr("\nmemory slices: %s", _mem_slice_head.length() > 0 ? "" : "NONE");
3216 for (int m = 0; m < _mem_slice_head.length(); m++) {
3217 tty->print("%3d ", m); _mem_slice_head.at(m)->dump();
3218 tty->print(" "); _mem_slice_tail.at(m)->dump();
3219 }
3220 }
3221 #endif
3222 assert(rpo_idx == -1 && bb_ct == _block.length(), "all block members found");
3223 return (_mem_slice_head.length() > 0) || (reduction_uses > 0) || (_data_entry.length() > 0);
3224 }
3225
3226 //------------------------------initialize_bb---------------------------
3227 // Initialize per node info
3228 void SuperWord::initialize_bb() {
3229 Node* last = _block.at(_block.length() - 1);
3230 grow_node_info(bb_idx(last));
3231 }
3232
3233 //------------------------------bb_insert_after---------------------------
3234 // Insert n into block after pos
3235 void SuperWord::bb_insert_after(Node* n, int pos) {
3236 int n_pos = pos + 1;
3237 // Make room
3238 for (int i = _block.length() - 1; i >= n_pos; i--) {
3239 _block.at_put_grow(i+1, _block.at(i));
3240 }
3241 for (int j = _node_info.length() - 1; j >= n_pos; j--) {
3242 _node_info.at_put_grow(j+1, _node_info.at(j));
3243 }
3244 // Set value
3245 _block.at_put_grow(n_pos, n);
3246 _node_info.at_put_grow(n_pos, SWNodeInfo::initial);
3247 // Adjust map from node->_idx to _block index
3248 for (int i = n_pos; i < _block.length(); i++) {
3249 set_bb_idx(_block.at(i), i);
3250 }
3251 }
3252
3253 //------------------------------compute_max_depth---------------------------
3254 // Compute max depth for expressions from beginning of block
3255 // Use to prune search paths during test for independence.
3256 void SuperWord::compute_max_depth() {
3257 int ct = 0;
3258 bool again;
3259 do {
3260 again = false;
3261 for (int i = 0; i < _block.length(); i++) {
3262 Node* n = _block.at(i);
3263 if (!n->is_Phi()) {
3264 int d_orig = depth(n);
3265 int d_in = 0;
3266 for (DepPreds preds(n, _dg); !preds.done(); preds.next()) {
3267 Node* pred = preds.current();
3268 if (in_bb(pred)) {
3269 d_in = MAX2(d_in, depth(pred));
3270 }
3271 }
3272 if (d_in + 1 != d_orig) {
3273 set_depth(n, d_in + 1);
3274 again = true;
3275 }
3276 }
3277 }
3278 ct++;
3279 } while (again);
3280
3281 if (TraceSuperWord && Verbose) {
3282 tty->print_cr("compute_max_depth iterated: %d times", ct);
3283 }
3284 }
3285
3286 //-------------------------compute_vector_element_type-----------------------
3287 // Compute necessary vector element type for expressions
3288 // This propagates backwards a narrower integer type when the
3289 // upper bits of the value are not needed.
3290 // Example: char a,b,c; a = b + c;
3291 // Normally the type of the add is integer, but for packed character
3292 // operations the type of the add needs to be char.
3293 void SuperWord::compute_vector_element_type() {
3294 if (TraceSuperWord && Verbose) {
3295 tty->print_cr("\ncompute_velt_type:");
3296 }
3297
3298 // Initial type
3299 for (int i = 0; i < _block.length(); i++) {
3300 Node* n = _block.at(i);
3301 set_velt_type(n, container_type(n));
3302 }
3303
3304 // Propagate integer narrowed type backwards through operations
3305 // that don't depend on higher order bits
3306 for (int i = _block.length() - 1; i >= 0; i--) {
3307 Node* n = _block.at(i);
3308 // Only integer types need be examined
3309 const Type* vtn = velt_type(n);
3310 if (vtn->basic_type() == T_INT) {
3311 uint start, end;
3312 VectorNode::vector_operands(n, &start, &end);
3313
3314 for (uint j = start; j < end; j++) {
3315 Node* in = n->in(j);
3316 // Don't propagate through a memory
3317 if (!in->is_Mem() && in_bb(in) && velt_type(in)->basic_type() == T_INT &&
3318 data_size(n) < data_size(in)) {
3319 bool same_type = true;
3320 for (DUIterator_Fast kmax, k = in->fast_outs(kmax); k < kmax; k++) {
3321 Node *use = in->fast_out(k);
3322 if (!in_bb(use) || !same_velt_type(use, n)) {
3323 same_type = false;
3324 break;
3325 }
3326 }
3327 if (same_type) {
3328 // In any Java arithmetic operation, operands of small integer types
3329 // (boolean, byte, char & short) should be promoted to int first. As
3330 // vector elements of small types don't have upper bits of int, for
3331 // RShiftI or AbsI operations, the compiler has to know the precise
3332 // signedness info of the 1st operand. These operations shouldn't be
3333 // vectorized if the signedness info is imprecise.
3334 const Type* vt = vtn;
3335 int op = in->Opcode();
3336 if (VectorNode::is_shift_opcode(op) || op == Op_AbsI) {
3337 Node* load = in->in(1);
3338 if (load->is_Load() && in_bb(load) && (velt_type(load)->basic_type() == T_INT)) {
3339 // Only Load nodes distinguish signed (LoadS/LoadB) and unsigned
3340 // (LoadUS/LoadUB) values. Store nodes only have one version.
3341 vt = velt_type(load);
3342 } else if (op != Op_LShiftI) {
3343 // Widen type to int to avoid the creation of vector nodes. Note
3344 // that left shifts work regardless of the signedness.
3345 vt = TypeInt::INT;
3346 }
3347 }
3348 set_velt_type(in, vt);
3349 }
3350 }
3351 }
3352 }
3353 }
3354 #ifndef PRODUCT
3355 if (TraceSuperWord && Verbose) {
3356 for (int i = 0; i < _block.length(); i++) {
3357 Node* n = _block.at(i);
3358 velt_type(n)->dump();
3359 tty->print("\t");
3360 n->dump();
3361 }
3362 }
3363 #endif
3364 }
3365
3366 //------------------------------memory_alignment---------------------------
3367 // Alignment within a vector memory reference
3368 int SuperWord::memory_alignment(MemNode* s, int iv_adjust) {
3369 #ifndef PRODUCT
3370 if ((TraceSuperWord && Verbose) || is_trace_alignment()) {
3371 tty->print("SuperWord::memory_alignment within a vector memory reference for %d: ", s->_idx); s->dump();
3372 }
3373 #endif
3374 NOT_PRODUCT(SWPointer::Tracer::Depth ddd(0);)
3375 SWPointer p(s, this, NULL, false);
3376 if (!p.valid()) {
3377 NOT_PRODUCT(if(is_trace_alignment()) tty->print_cr("SWPointer::memory_alignment: SWPointer p invalid, return bottom_align");)
3378 return bottom_align;
3379 }
3380 int vw = get_vw_bytes_special(s);
3381 if (vw < 2) {
3382 NOT_PRODUCT(if(is_trace_alignment()) tty->print_cr("SWPointer::memory_alignment: vector_width_in_bytes < 2, return bottom_align");)
3383 return bottom_align; // No vectors for this type
3384 }
3385 int offset = p.offset_in_bytes();
3386 offset += iv_adjust*p.memory_size();
3387 int off_rem = offset % vw;
3388 int off_mod = off_rem >= 0 ? off_rem : off_rem + vw;
3389 #ifndef PRODUCT
3390 if ((TraceSuperWord && Verbose) || is_trace_alignment()) {
3391 tty->print_cr("SWPointer::memory_alignment: off_rem = %d, off_mod = %d", off_rem, off_mod);
3392 }
3393 #endif
3394 return off_mod;
3395 }
3396
3397 //---------------------------container_type---------------------------
3398 // Smallest type containing range of values
3399 const Type* SuperWord::container_type(Node* n) {
3400 if (n->is_Mem()) {
3401 BasicType bt = n->as_Mem()->memory_type();
3402 if (n->is_Store() && (bt == T_CHAR)) {
3403 // Use T_SHORT type instead of T_CHAR for stored values because any
3404 // preceding arithmetic operation extends values to signed Int.
3405 bt = T_SHORT;
3406 }
3407 if (n->Opcode() == Op_LoadUB) {
3408 // Adjust type for unsigned byte loads, it is important for right shifts.
3409 // T_BOOLEAN is used because there is no basic type representing type
3410 // TypeInt::UBYTE. Use of T_BOOLEAN for vectors is fine because only
3411 // size (one byte) and sign is important.
3412 bt = T_BOOLEAN;
3413 }
3414 return Type::get_const_basic_type(bt);
3415 }
3416 const Type* t = _igvn.type(n);
3417 if (t->basic_type() == T_INT) {
3418 // A narrow type of arithmetic operations will be determined by
3419 // propagating the type of memory operations.
3420 return TypeInt::INT;
3421 }
3422 return t;
3423 }
3424
3425 bool SuperWord::same_velt_type(Node* n1, Node* n2) {
3426 const Type* vt1 = velt_type(n1);
3427 const Type* vt2 = velt_type(n2);
3428 if (vt1->basic_type() == T_INT && vt2->basic_type() == T_INT) {
3429 // Compare vectors element sizes for integer types.
3430 return data_size(n1) == data_size(n2);
3431 }
3432 return vt1 == vt2;
3433 }
3434
3435 //------------------------------in_packset---------------------------
3436 // Are s1 and s2 in a pack pair and ordered as s1,s2?
3437 bool SuperWord::in_packset(Node* s1, Node* s2) {
3438 for (int i = 0; i < _packset.length(); i++) {
3439 Node_List* p = _packset.at(i);
3440 assert(p->size() == 2, "must be");
3441 if (p->at(0) == s1 && p->at(p->size()-1) == s2) {
3442 return true;
3443 }
3444 }
3445 return false;
3446 }
3447
3448 //------------------------------in_pack---------------------------
3449 // Is s in pack p?
3450 Node_List* SuperWord::in_pack(Node* s, Node_List* p) {
3451 for (uint i = 0; i < p->size(); i++) {
3452 if (p->at(i) == s) {
3453 return p;
3454 }
3455 }
3456 return NULL;
3457 }
3458
3459 //------------------------------remove_pack_at---------------------------
3460 // Remove the pack at position pos in the packset
3461 void SuperWord::remove_pack_at(int pos) {
3462 Node_List* p = _packset.at(pos);
3463 for (uint i = 0; i < p->size(); i++) {
3464 Node* s = p->at(i);
3465 set_my_pack(s, NULL);
3466 }
3467 _packset.remove_at(pos);
3468 }
3469
3470 void SuperWord::packset_sort(int n) {
3471 // simple bubble sort so that we capitalize with O(n) when its already sorted
3472 while (n != 0) {
3473 bool swapped = false;
3474 for (int i = 1; i < n; i++) {
3475 Node_List* q_low = _packset.at(i-1);
3476 Node_List* q_i = _packset.at(i);
3477
3478 // only swap when we find something to swap
3479 if (alignment(q_low->at(0)) > alignment(q_i->at(0))) {
3480 Node_List* t = q_i;
3481 *(_packset.adr_at(i)) = q_low;
3482 *(_packset.adr_at(i-1)) = q_i;
3483 swapped = true;
3484 }
3485 }
3486 if (swapped == false) break;
3487 n--;
3488 }
3489 }
3490
3491 //------------------------------executed_first---------------------------
3492 // Return the node executed first in pack p. Uses the RPO block list
3493 // to determine order.
3494 Node* SuperWord::executed_first(Node_List* p) {
3495 Node* n = p->at(0);
3496 int n_rpo = bb_idx(n);
3497 for (uint i = 1; i < p->size(); i++) {
3498 Node* s = p->at(i);
3499 int s_rpo = bb_idx(s);
3500 if (s_rpo < n_rpo) {
3501 n = s;
3502 n_rpo = s_rpo;
3503 }
3504 }
3505 return n;
3506 }
3507
3508 //------------------------------executed_last---------------------------
3509 // Return the node executed last in pack p.
3510 Node* SuperWord::executed_last(Node_List* p) {
3511 Node* n = p->at(0);
3512 int n_rpo = bb_idx(n);
3513 for (uint i = 1; i < p->size(); i++) {
3514 Node* s = p->at(i);
3515 int s_rpo = bb_idx(s);
3516 if (s_rpo > n_rpo) {
3517 n = s;
3518 n_rpo = s_rpo;
3519 }
3520 }
3521 return n;
3522 }
3523
3524 LoadNode::ControlDependency SuperWord::control_dependency(Node_List* p) {
3525 LoadNode::ControlDependency dep = LoadNode::DependsOnlyOnTest;
3526 for (uint i = 0; i < p->size(); i++) {
3527 Node* n = p->at(i);
3528 assert(n->is_Load(), "only meaningful for loads");
3529 if (!n->depends_only_on_test()) {
3530 if (n->as_Load()->has_unknown_control_dependency() &&
3531 dep != LoadNode::Pinned) {
3532 // Upgrade to unknown control...
3533 dep = LoadNode::UnknownControl;
3534 } else {
3535 // Otherwise, we must pin it.
3536 dep = LoadNode::Pinned;
3537 }
3538 }
3539 }
3540 return dep;
3541 }
3542
3543
3544 //----------------------------align_initial_loop_index---------------------------
3545 // Adjust pre-loop limit so that in main loop, a load/store reference
3546 // to align_to_ref will be a position zero in the vector.
3547 // (iv + k) mod vector_align == 0
3548 void SuperWord::align_initial_loop_index(MemNode* align_to_ref) {
3549 assert(lp()->is_main_loop(), "");
3550 CountedLoopEndNode* pre_end = pre_loop_end();
3551 Node* pre_opaq1 = pre_end->limit();
3552 assert(pre_opaq1->Opcode() == Op_Opaque1, "");
3553 Opaque1Node* pre_opaq = (Opaque1Node*)pre_opaq1;
3554 Node* lim0 = pre_opaq->in(1);
3555
3556 // Where we put new limit calculations
3557 Node* pre_ctrl = pre_loop_head()->in(LoopNode::EntryControl);
3558
3559 // Ensure the original loop limit is available from the
3560 // pre-loop Opaque1 node.
3561 Node* orig_limit = pre_opaq->original_loop_limit();
3562 assert(orig_limit != NULL && _igvn.type(orig_limit) != Type::TOP, "");
3563
3564 SWPointer align_to_ref_p(align_to_ref, this, NULL, false);
3565 assert(align_to_ref_p.valid(), "sanity");
3566
3567 // Given:
3568 // lim0 == original pre loop limit
3569 // V == v_align (power of 2)
3570 // invar == extra invariant piece of the address expression
3571 // e == offset [ +/- invar ]
3572 //
3573 // When reassociating expressions involving '%' the basic rules are:
3574 // (a - b) % k == 0 => a % k == b % k
3575 // and:
3576 // (a + b) % k == 0 => a % k == (k - b) % k
3577 //
3578 // For stride > 0 && scale > 0,
3579 // Derive the new pre-loop limit "lim" such that the two constraints:
3580 // (1) lim = lim0 + N (where N is some positive integer < V)
3581 // (2) (e + lim) % V == 0
3582 // are true.
3583 //
3584 // Substituting (1) into (2),
3585 // (e + lim0 + N) % V == 0
3586 // solve for N:
3587 // N = (V - (e + lim0)) % V
3588 // substitute back into (1), so that new limit
3589 // lim = lim0 + (V - (e + lim0)) % V
3590 //
3591 // For stride > 0 && scale < 0
3592 // Constraints:
3593 // lim = lim0 + N
3594 // (e - lim) % V == 0
3595 // Solving for lim:
3596 // (e - lim0 - N) % V == 0
3597 // N = (e - lim0) % V
3598 // lim = lim0 + (e - lim0) % V
3599 //
3600 // For stride < 0 && scale > 0
3601 // Constraints:
3602 // lim = lim0 - N
3603 // (e + lim) % V == 0
3604 // Solving for lim:
3605 // (e + lim0 - N) % V == 0
3606 // N = (e + lim0) % V
3607 // lim = lim0 - (e + lim0) % V
3608 //
3609 // For stride < 0 && scale < 0
3610 // Constraints:
3611 // lim = lim0 - N
3612 // (e - lim) % V == 0
3613 // Solving for lim:
3614 // (e - lim0 + N) % V == 0
3615 // N = (V - (e - lim0)) % V
3616 // lim = lim0 - (V - (e - lim0)) % V
3617
3618 int vw = vector_width_in_bytes(align_to_ref);
3619 int stride = iv_stride();
3620 int scale = align_to_ref_p.scale_in_bytes();
3621 int elt_size = align_to_ref_p.memory_size();
3622 int v_align = vw / elt_size;
3623 assert(v_align > 1, "sanity");
3624 int offset = align_to_ref_p.offset_in_bytes() / elt_size;
3625 Node *offsn = _igvn.intcon(offset);
3626
3627 Node *e = offsn;
3628 if (align_to_ref_p.invar() != NULL) {
3629 // incorporate any extra invariant piece producing (offset +/- invar) >>> log2(elt)
3630 Node* log2_elt = _igvn.intcon(exact_log2(elt_size));
3631 Node* invar = align_to_ref_p.invar();
3632 if (_igvn.type(invar)->isa_long()) {
3633 // Computations are done % (vector width/element size) so it's
3634 // safe to simply convert invar to an int and loose the upper 32
3635 // bit half.
3636 invar = new ConvL2INode(invar);
3637 _igvn.register_new_node_with_optimizer(invar);
3638 }
3639 Node* invar_scale = align_to_ref_p.invar_scale();
3640 if (invar_scale != NULL) {
3641 invar = new LShiftINode(invar, invar_scale);
3642 _igvn.register_new_node_with_optimizer(invar);
3643 }
3644 Node* aref = new URShiftINode(invar, log2_elt);
3645 _igvn.register_new_node_with_optimizer(aref);
3646 _phase->set_ctrl(aref, pre_ctrl);
3647 if (align_to_ref_p.negate_invar()) {
3648 e = new SubINode(e, aref);
3649 } else {
3650 e = new AddINode(e, aref);
3651 }
3652 _igvn.register_new_node_with_optimizer(e);
3653 _phase->set_ctrl(e, pre_ctrl);
3654 }
3655 if (vw > ObjectAlignmentInBytes || align_to_ref_p.base()->is_top()) {
3656 // incorporate base e +/- base && Mask >>> log2(elt)
3657 Node* xbase = new CastP2XNode(NULL, align_to_ref_p.adr());
3658 _igvn.register_new_node_with_optimizer(xbase);
3659 #ifdef _LP64
3660 xbase = new ConvL2INode(xbase);
3661 _igvn.register_new_node_with_optimizer(xbase);
3662 #endif
3663 Node* mask = _igvn.intcon(vw-1);
3664 Node* masked_xbase = new AndINode(xbase, mask);
3665 _igvn.register_new_node_with_optimizer(masked_xbase);
3666 Node* log2_elt = _igvn.intcon(exact_log2(elt_size));
3667 Node* bref = new URShiftINode(masked_xbase, log2_elt);
3668 _igvn.register_new_node_with_optimizer(bref);
3669 _phase->set_ctrl(bref, pre_ctrl);
3670 e = new AddINode(e, bref);
3671 _igvn.register_new_node_with_optimizer(e);
3672 _phase->set_ctrl(e, pre_ctrl);
3673 }
3674
3675 // compute e +/- lim0
3676 if (scale < 0) {
3677 e = new SubINode(e, lim0);
3678 } else {
3679 e = new AddINode(e, lim0);
3680 }
3681 _igvn.register_new_node_with_optimizer(e);
3682 _phase->set_ctrl(e, pre_ctrl);
3683
3684 if (stride * scale > 0) {
3685 // compute V - (e +/- lim0)
3686 Node* va = _igvn.intcon(v_align);
3687 e = new SubINode(va, e);
3688 _igvn.register_new_node_with_optimizer(e);
3689 _phase->set_ctrl(e, pre_ctrl);
3690 }
3691 // compute N = (exp) % V
3692 Node* va_msk = _igvn.intcon(v_align - 1);
3693 Node* N = new AndINode(e, va_msk);
3694 _igvn.register_new_node_with_optimizer(N);
3695 _phase->set_ctrl(N, pre_ctrl);
3696
3697 // substitute back into (1), so that new limit
3698 // lim = lim0 + N
3699 Node* lim;
3700 if (stride < 0) {
3701 lim = new SubINode(lim0, N);
3702 } else {
3703 lim = new AddINode(lim0, N);
3704 }
3705 _igvn.register_new_node_with_optimizer(lim);
3706 _phase->set_ctrl(lim, pre_ctrl);
3707 Node* constrained =
3708 (stride > 0) ? (Node*) new MinINode(lim, orig_limit)
3709 : (Node*) new MaxINode(lim, orig_limit);
3710 _igvn.register_new_node_with_optimizer(constrained);
3711 _phase->set_ctrl(constrained, pre_ctrl);
3712 _igvn.replace_input_of(pre_opaq, 1, constrained);
3713 }
3714
3715 //----------------------------get_pre_loop_end---------------------------
3716 // Find pre loop end from main loop. Returns null if none.
3717 CountedLoopEndNode* SuperWord::find_pre_loop_end(CountedLoopNode* cl) const {
3718 // The loop cannot be optimized if the graph shape at
3719 // the loop entry is inappropriate.
3720 if (cl->is_canonical_loop_entry() == NULL) {
3721 return NULL;
3722 }
3723
3724 Node* p_f = cl->skip_predicates()->in(0)->in(0);
3725 if (!p_f->is_IfFalse()) return NULL;
3726 if (!p_f->in(0)->is_CountedLoopEnd()) return NULL;
3727 CountedLoopEndNode* pre_end = p_f->in(0)->as_CountedLoopEnd();
3728 CountedLoopNode* loop_node = pre_end->loopnode();
3729 if (loop_node == NULL || !loop_node->is_pre_loop()) return NULL;
3730 return pre_end;
3731 }
3732
3733 //------------------------------init---------------------------
3734 void SuperWord::init() {
3735 _dg.init();
3736 _packset.clear();
3737 _disjoint_ptrs.clear();
3738 _block.clear();
3739 _post_block.clear();
3740 _data_entry.clear();
3741 _mem_slice_head.clear();
3742 _mem_slice_tail.clear();
3743 _iteration_first.clear();
3744 _iteration_last.clear();
3745 _node_info.clear();
3746 _align_to_ref = NULL;
3747 _lpt = NULL;
3748 _lp = NULL;
3749 _bb = NULL;
3750 _iv = NULL;
3751 _race_possible = 0;
3752 _early_return = false;
3753 _num_work_vecs = 0;
3754 _num_reductions = 0;
3755 }
3756
3757 //------------------------------restart---------------------------
3758 void SuperWord::restart() {
3759 _dg.init();
3760 _packset.clear();
3761 _disjoint_ptrs.clear();
3762 _block.clear();
3763 _post_block.clear();
3764 _data_entry.clear();
3765 _mem_slice_head.clear();
3766 _mem_slice_tail.clear();
3767 _node_info.clear();
3768 }
3769
3770 //------------------------------print_packset---------------------------
3771 void SuperWord::print_packset() {
3772 #ifndef PRODUCT
3773 tty->print_cr("packset");
3774 for (int i = 0; i < _packset.length(); i++) {
3775 tty->print_cr("Pack: %d", i);
3776 Node_List* p = _packset.at(i);
3777 print_pack(p);
3778 }
3779 #endif
3780 }
3781
3782 //------------------------------print_pack---------------------------
3783 void SuperWord::print_pack(Node_List* p) {
3784 for (uint i = 0; i < p->size(); i++) {
3785 print_stmt(p->at(i));
3786 }
3787 }
3788
3789 //------------------------------print_bb---------------------------
3790 void SuperWord::print_bb() {
3791 #ifndef PRODUCT
3792 tty->print_cr("\nBlock");
3793 for (int i = 0; i < _block.length(); i++) {
3794 Node* n = _block.at(i);
3795 tty->print("%d ", i);
3796 if (n) {
3797 n->dump();
3798 }
3799 }
3800 #endif
3801 }
3802
3803 //------------------------------print_stmt---------------------------
3804 void SuperWord::print_stmt(Node* s) {
3805 #ifndef PRODUCT
3806 tty->print(" align: %d \t", alignment(s));
3807 s->dump();
3808 #endif
3809 }
3810
3811 //------------------------------blank---------------------------
3812 char* SuperWord::blank(uint depth) {
3813 static char blanks[101];
3814 assert(depth < 101, "too deep");
3815 for (uint i = 0; i < depth; i++) blanks[i] = ' ';
3816 blanks[depth] = '\0';
3817 return blanks;
3818 }
3819
3820
3821 //==============================SWPointer===========================
3822 #ifndef PRODUCT
3823 int SWPointer::Tracer::_depth = 0;
3824 #endif
3825 //----------------------------SWPointer------------------------
3826 SWPointer::SWPointer(MemNode* mem, SuperWord* slp, Node_Stack *nstack, bool analyze_only) :
3827 _mem(mem), _slp(slp), _base(NULL), _adr(NULL),
3828 _scale(0), _offset(0), _invar(NULL), _negate_invar(false),
3829 _invar_scale(NULL),
3830 _nstack(nstack), _analyze_only(analyze_only),
3831 _stack_idx(0)
3832 #ifndef PRODUCT
3833 , _tracer(slp)
3834 #endif
3835 {
3836 NOT_PRODUCT(_tracer.ctor_1(mem);)
3837
3838 Node* adr = mem->in(MemNode::Address);
3839 if (!adr->is_AddP()) {
3840 assert(!valid(), "too complex");
3841 return;
3842 }
3843 // Match AddP(base, AddP(ptr, k*iv [+ invariant]), constant)
3844 Node* base = adr->in(AddPNode::Base);
3845 // The base address should be loop invariant
3846 if (is_loop_member(base)) {
3847 assert(!valid(), "base address is loop variant");
3848 return;
3849 }
3850 // unsafe references require misaligned vector access support
3851 if (base->is_top() && !Matcher::misaligned_vectors_ok()) {
3852 assert(!valid(), "unsafe access");
3853 return;
3854 }
3855
3856 NOT_PRODUCT(if(_slp->is_trace_alignment()) _tracer.store_depth();)
3857 NOT_PRODUCT(_tracer.ctor_2(adr);)
3858
3859 int i;
3860 for (i = 0; i < 3; i++) {
3861 NOT_PRODUCT(_tracer.ctor_3(adr, i);)
3862
3863 if (!scaled_iv_plus_offset(adr->in(AddPNode::Offset))) {
3864 assert(!valid(), "too complex");
3865 return;
3866 }
3867 adr = adr->in(AddPNode::Address);
3868 NOT_PRODUCT(_tracer.ctor_4(adr, i);)
3869
3870 if (base == adr || !adr->is_AddP()) {
3871 NOT_PRODUCT(_tracer.ctor_5(adr, base, i);)
3872 break; // stop looking at addp's
3873 }
3874 }
3875 if (is_loop_member(adr)) {
3876 assert(!valid(), "adr is loop variant");
3877 return;
3878 }
3879
3880 if (!base->is_top() && adr != base) {
3881 assert(!valid(), "adr and base differ");
3882 return;
3883 }
3884
3885 NOT_PRODUCT(if(_slp->is_trace_alignment()) _tracer.restore_depth();)
3886 NOT_PRODUCT(_tracer.ctor_6(mem);)
3887
3888 _base = base;
3889 _adr = adr;
3890 assert(valid(), "Usable");
3891 }
3892
3893 // Following is used to create a temporary object during
3894 // the pattern match of an address expression.
3895 SWPointer::SWPointer(SWPointer* p) :
3896 _mem(p->_mem), _slp(p->_slp), _base(NULL), _adr(NULL),
3897 _scale(0), _offset(0), _invar(NULL), _negate_invar(false),
3898 _invar_scale(NULL),
3899 _nstack(p->_nstack), _analyze_only(p->_analyze_only),
3900 _stack_idx(p->_stack_idx)
3901 #ifndef PRODUCT
3902 , _tracer(p->_slp)
3903 #endif
3904 {}
3905
3906 bool SWPointer::is_loop_member(Node* n) const {
3907 Node* n_c = phase()->get_ctrl(n);
3908 return lpt()->is_member(phase()->get_loop(n_c));
3909 }
3910
3911 bool SWPointer::invariant(Node* n) const {
3912 NOT_PRODUCT(Tracer::Depth dd;)
3913 Node* n_c = phase()->get_ctrl(n);
3914 NOT_PRODUCT(_tracer.invariant_1(n, n_c);)
3915 bool is_not_member = !is_loop_member(n);
3916 if (is_not_member && _slp->lp()->is_main_loop()) {
3917 // Check that n_c dominates the pre loop head node. If it does not, then we cannot use n as invariant for the pre loop
3918 // CountedLoopEndNode check because n_c is either part of the pre loop or between the pre and the main loop (illegal
3919 // invariant: Happens, for example, when n_c is a CastII node that prevents data nodes to flow above the main loop).
3920 return phase()->is_dominator(n_c, _slp->pre_loop_head());
3921 }
3922 return is_not_member;
3923 }
3924
3925 //------------------------scaled_iv_plus_offset--------------------
3926 // Match: k*iv + offset
3927 // where: k is a constant that maybe zero, and
3928 // offset is (k2 [+/- invariant]) where k2 maybe zero and invariant is optional
3929 bool SWPointer::scaled_iv_plus_offset(Node* n) {
3930 NOT_PRODUCT(Tracer::Depth ddd;)
3931 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_1(n);)
3932
3933 if (scaled_iv(n)) {
3934 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_2(n);)
3935 return true;
3936 }
3937
3938 if (offset_plus_k(n)) {
3939 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_3(n);)
3940 return true;
3941 }
3942
3943 int opc = n->Opcode();
3944 if (opc == Op_AddI) {
3945 if (offset_plus_k(n->in(2)) && scaled_iv_plus_offset(n->in(1))) {
3946 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_4(n);)
3947 return true;
3948 }
3949 if (offset_plus_k(n->in(1)) && scaled_iv_plus_offset(n->in(2))) {
3950 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_5(n);)
3951 return true;
3952 }
3953 } else if (opc == Op_SubI) {
3954 if (offset_plus_k(n->in(2), true) && scaled_iv_plus_offset(n->in(1))) {
3955 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_6(n);)
3956 return true;
3957 }
3958 if (offset_plus_k(n->in(1)) && scaled_iv_plus_offset(n->in(2))) {
3959 _scale *= -1;
3960 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_7(n);)
3961 return true;
3962 }
3963 }
3964
3965 NOT_PRODUCT(_tracer.scaled_iv_plus_offset_8(n);)
3966 return false;
3967 }
3968
3969 //----------------------------scaled_iv------------------------
3970 // Match: k*iv where k is a constant that's not zero
3971 bool SWPointer::scaled_iv(Node* n) {
3972 NOT_PRODUCT(Tracer::Depth ddd;)
3973 NOT_PRODUCT(_tracer.scaled_iv_1(n);)
3974
3975 if (_scale != 0) { // already found a scale
3976 NOT_PRODUCT(_tracer.scaled_iv_2(n, _scale);)
3977 return false;
3978 }
3979
3980 if (n == iv()) {
3981 _scale = 1;
3982 NOT_PRODUCT(_tracer.scaled_iv_3(n, _scale);)
3983 return true;
3984 }
3985 if (_analyze_only && (is_loop_member(n))) {
3986 _nstack->push(n, _stack_idx++);
3987 }
3988
3989 int opc = n->Opcode();
3990 if (opc == Op_MulI) {
3991 if (n->in(1) == iv() && n->in(2)->is_Con()) {
3992 _scale = n->in(2)->get_int();
3993 NOT_PRODUCT(_tracer.scaled_iv_4(n, _scale);)
3994 return true;
3995 } else if (n->in(2) == iv() && n->in(1)->is_Con()) {
3996 _scale = n->in(1)->get_int();
3997 NOT_PRODUCT(_tracer.scaled_iv_5(n, _scale);)
3998 return true;
3999 }
4000 } else if (opc == Op_LShiftI) {
4001 if (n->in(1) == iv() && n->in(2)->is_Con()) {
4002 _scale = 1 << n->in(2)->get_int();
4003 NOT_PRODUCT(_tracer.scaled_iv_6(n, _scale);)
4004 return true;
4005 }
4006 } else if (opc == Op_ConvI2L || opc == Op_CastII) {
4007 if (scaled_iv_plus_offset(n->in(1))) {
4008 NOT_PRODUCT(_tracer.scaled_iv_7(n);)
4009 return true;
4010 }
4011 } else if (opc == Op_LShiftL && n->in(2)->is_Con()) {
4012 if (!has_iv() && _invar == NULL) {
4013 // Need to preserve the current _offset value, so
4014 // create a temporary object for this expression subtree.
4015 // Hacky, so should re-engineer the address pattern match.
4016 NOT_PRODUCT(Tracer::Depth dddd;)
4017 SWPointer tmp(this);
4018 NOT_PRODUCT(_tracer.scaled_iv_8(n, &tmp);)
4019
4020 if (tmp.scaled_iv_plus_offset(n->in(1))) {
4021 int scale = n->in(2)->get_int();
4022 _scale = tmp._scale << scale;
4023 _offset += tmp._offset << scale;
4024 _invar = tmp._invar;
4025 if (_invar != NULL) {
4026 _negate_invar = tmp._negate_invar;
4027 _invar_scale = n->in(2);
4028 }
4029 NOT_PRODUCT(_tracer.scaled_iv_9(n, _scale, _offset, _invar, _negate_invar);)
4030 return true;
4031 }
4032 }
4033 }
4034 NOT_PRODUCT(_tracer.scaled_iv_10(n);)
4035 return false;
4036 }
4037
4038 //----------------------------offset_plus_k------------------------
4039 // Match: offset is (k [+/- invariant])
4040 // where k maybe zero and invariant is optional, but not both.
4041 bool SWPointer::offset_plus_k(Node* n, bool negate) {
4042 NOT_PRODUCT(Tracer::Depth ddd;)
4043 NOT_PRODUCT(_tracer.offset_plus_k_1(n);)
4044
4045 int opc = n->Opcode();
4046 if (opc == Op_ConI) {
4047 _offset += negate ? -(n->get_int()) : n->get_int();
4048 NOT_PRODUCT(_tracer.offset_plus_k_2(n, _offset);)
4049 return true;
4050 } else if (opc == Op_ConL) {
4051 // Okay if value fits into an int
4052 const TypeLong* t = n->find_long_type();
4053 if (t->higher_equal(TypeLong::INT)) {
4054 jlong loff = n->get_long();
4055 jint off = (jint)loff;
4056 _offset += negate ? -off : loff;
4057 NOT_PRODUCT(_tracer.offset_plus_k_3(n, _offset);)
4058 return true;
4059 }
4060 NOT_PRODUCT(_tracer.offset_plus_k_4(n);)
4061 return false;
4062 }
4063 if (_invar != NULL) { // already has an invariant
4064 NOT_PRODUCT(_tracer.offset_plus_k_5(n, _invar);)
4065 return false;
4066 }
4067
4068 if (_analyze_only && is_loop_member(n)) {
4069 _nstack->push(n, _stack_idx++);
4070 }
4071 if (opc == Op_AddI) {
4072 if (n->in(2)->is_Con() && invariant(n->in(1))) {
4073 _negate_invar = negate;
4074 _invar = n->in(1);
4075 _offset += negate ? -(n->in(2)->get_int()) : n->in(2)->get_int();
4076 NOT_PRODUCT(_tracer.offset_plus_k_6(n, _invar, _negate_invar, _offset);)
4077 return true;
4078 } else if (n->in(1)->is_Con() && invariant(n->in(2))) {
4079 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int();
4080 _negate_invar = negate;
4081 _invar = n->in(2);
4082 NOT_PRODUCT(_tracer.offset_plus_k_7(n, _invar, _negate_invar, _offset);)
4083 return true;
4084 }
4085 }
4086 if (opc == Op_SubI) {
4087 if (n->in(2)->is_Con() && invariant(n->in(1))) {
4088 _negate_invar = negate;
4089 _invar = n->in(1);
4090 _offset += !negate ? -(n->in(2)->get_int()) : n->in(2)->get_int();
4091 NOT_PRODUCT(_tracer.offset_plus_k_8(n, _invar, _negate_invar, _offset);)
4092 return true;
4093 } else if (n->in(1)->is_Con() && invariant(n->in(2))) {
4094 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int();
4095 _negate_invar = !negate;
4096 _invar = n->in(2);
4097 NOT_PRODUCT(_tracer.offset_plus_k_9(n, _invar, _negate_invar, _offset);)
4098 return true;
4099 }
4100 }
4101
4102 if (!is_loop_member(n)) {
4103 // 'n' is loop invariant. Skip ConvI2L and CastII nodes before checking if 'n' is dominating the pre loop.
4104 if (opc == Op_ConvI2L) {
4105 n = n->in(1);
4106 }
4107 if (n->Opcode() == Op_CastII) {
4108 // Skip CastII nodes
4109 assert(!is_loop_member(n), "sanity");
4110 n = n->in(1);
4111 }
4112 // Check if 'n' can really be used as invariant (not in main loop and dominating the pre loop).
4113 if (invariant(n)) {
4114 _negate_invar = negate;
4115 _invar = n;
4116 NOT_PRODUCT(_tracer.offset_plus_k_10(n, _invar, _negate_invar, _offset);)
4117 return true;
4118 }
4119 }
4120
4121 NOT_PRODUCT(_tracer.offset_plus_k_11(n);)
4122 return false;
4123 }
4124
4125 //-----------------has_potential_dependence-----------------
4126 // Check potential data dependence among all memory accesses.
4127 // We require every two accesses (with at least one store) of
4128 // the same element type has the same address expression.
4129 bool SWPointer::has_potential_dependence(GrowableArray<SWPointer*> swptrs) {
4130 for (int i1 = 0; i1 < swptrs.length(); i1++) {
4131 SWPointer* p1 = swptrs.at(i1);
4132 MemNode* n1 = p1->mem();
4133 BasicType bt1 = n1->memory_type();
4134
4135 // Iterate over remaining SWPointers
4136 for (int i2 = i1 + 1; i2 < swptrs.length(); i2++) {
4137 SWPointer* p2 = swptrs.at(i2);
4138 MemNode* n2 = p2->mem();
4139 BasicType bt2 = n2->memory_type();
4140
4141 // Data dependence exists between load-store, store-load
4142 // or store-store with the same element type or subword
4143 // size (subword load/store may have inaccurate type)
4144 if ((n1->is_Store() || n2->is_Store()) &&
4145 same_type_or_subword_size(bt1, bt2) && !p1->equal(*p2)) {
4146 return true;
4147 }
4148 }
4149 }
4150 return false;
4151 }
4152
4153 //----------------------------print------------------------
4154 void SWPointer::print() {
4155 #ifndef PRODUCT
4156 tty->print("base: [%d] adr: [%d] scale: %d offset: %d",
4157 _base != NULL ? _base->_idx : 0,
4158 _adr != NULL ? _adr->_idx : 0,
4159 _scale, _offset);
4160 if (_invar != NULL) {
4161 tty->print(" invar: %c[%d] << [%d]", _negate_invar?'-':'+', _invar->_idx, _invar_scale->_idx);
4162 }
4163 tty->cr();
4164 #endif
4165 }
4166
4167 //----------------------------tracing------------------------
4168 #ifndef PRODUCT
4169 void SWPointer::Tracer::print_depth() const {
4170 for (int ii = 0; ii < _depth; ++ii) {
4171 tty->print(" ");
4172 }
4173 }
4174
4175 void SWPointer::Tracer::ctor_1 (Node* mem) {
4176 if(_slp->is_trace_alignment()) {
4177 print_depth(); tty->print(" %d SWPointer::SWPointer: start alignment analysis", mem->_idx); mem->dump();
4178 }
4179 }
4180
4181 void SWPointer::Tracer::ctor_2(Node* adr) {
4182 if(_slp->is_trace_alignment()) {
4183 //store_depth();
4184 inc_depth();
4185 print_depth(); tty->print(" %d (adr) SWPointer::SWPointer: ", adr->_idx); adr->dump();
4186 inc_depth();
4187 print_depth(); tty->print(" %d (base) SWPointer::SWPointer: ", adr->in(AddPNode::Base)->_idx); adr->in(AddPNode::Base)->dump();
4188 }
4189 }
4190
4191 void SWPointer::Tracer::ctor_3(Node* adr, int i) {
4192 if(_slp->is_trace_alignment()) {
4193 inc_depth();
4194 Node* offset = adr->in(AddPNode::Offset);
4195 print_depth(); tty->print(" %d (offset) SWPointer::SWPointer: i = %d: ", offset->_idx, i); offset->dump();
4196 }
4197 }
4198
4199 void SWPointer::Tracer::ctor_4(Node* adr, int i) {
4200 if(_slp->is_trace_alignment()) {
4201 inc_depth();
4202 print_depth(); tty->print(" %d (adr) SWPointer::SWPointer: i = %d: ", adr->_idx, i); adr->dump();
4203 }
4204 }
4205
4206 void SWPointer::Tracer::ctor_5(Node* adr, Node* base, int i) {
4207 if(_slp->is_trace_alignment()) {
4208 inc_depth();
4209 if (base == adr) {
4210 print_depth(); tty->print_cr(" \\ %d (adr) == %d (base) SWPointer::SWPointer: breaking analysis at i = %d", adr->_idx, base->_idx, i);
4211 } else if (!adr->is_AddP()) {
4212 print_depth(); tty->print_cr(" \\ %d (adr) is NOT Addp SWPointer::SWPointer: breaking analysis at i = %d", adr->_idx, i);
4213 }
4214 }
4215 }
4216
4217 void SWPointer::Tracer::ctor_6(Node* mem) {
4218 if(_slp->is_trace_alignment()) {
4219 //restore_depth();
4220 print_depth(); tty->print_cr(" %d (adr) SWPointer::SWPointer: stop analysis", mem->_idx);
4221 }
4222 }
4223
4224 void SWPointer::Tracer::invariant_1(Node *n, Node *n_c) const {
4225 if (_slp->do_vector_loop() && _slp->is_debug() && _slp->_lpt->is_member(_slp->_phase->get_loop(n_c)) != (int)_slp->in_bb(n)) {
4226 int is_member = _slp->_lpt->is_member(_slp->_phase->get_loop(n_c));
4227 int in_bb = _slp->in_bb(n);
4228 print_depth(); tty->print(" \\ "); tty->print_cr(" %d SWPointer::invariant conditions differ: n_c %d", n->_idx, n_c->_idx);
4229 print_depth(); tty->print(" \\ "); tty->print_cr("is_member %d, in_bb %d", is_member, in_bb);
4230 print_depth(); tty->print(" \\ "); n->dump();
4231 print_depth(); tty->print(" \\ "); n_c->dump();
4232 }
4233 }
4234
4235 void SWPointer::Tracer::scaled_iv_plus_offset_1(Node* n) {
4236 if(_slp->is_trace_alignment()) {
4237 print_depth(); tty->print(" %d SWPointer::scaled_iv_plus_offset testing node: ", n->_idx);
4238 n->dump();
4239 }
4240 }
4241
4242 void SWPointer::Tracer::scaled_iv_plus_offset_2(Node* n) {
4243 if(_slp->is_trace_alignment()) {
4244 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: PASSED", n->_idx);
4245 }
4246 }
4247
4248 void SWPointer::Tracer::scaled_iv_plus_offset_3(Node* n) {
4249 if(_slp->is_trace_alignment()) {
4250 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: PASSED", n->_idx);
4251 }
4252 }
4253
4254 void SWPointer::Tracer::scaled_iv_plus_offset_4(Node* n) {
4255 if(_slp->is_trace_alignment()) {
4256 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: Op_AddI PASSED", n->_idx);
4257 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(1) is scaled_iv: ", n->in(1)->_idx); n->in(1)->dump();
4258 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(2) is offset_plus_k: ", n->in(2)->_idx); n->in(2)->dump();
4259 }
4260 }
4261
4262 void SWPointer::Tracer::scaled_iv_plus_offset_5(Node* n) {
4263 if(_slp->is_trace_alignment()) {
4264 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: Op_AddI PASSED", n->_idx);
4265 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(2) is scaled_iv: ", n->in(2)->_idx); n->in(2)->dump();
4266 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(1) is offset_plus_k: ", n->in(1)->_idx); n->in(1)->dump();
4267 }
4268 }
4269
4270 void SWPointer::Tracer::scaled_iv_plus_offset_6(Node* n) {
4271 if(_slp->is_trace_alignment()) {
4272 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: Op_SubI PASSED", n->_idx);
4273 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(1) is scaled_iv: ", n->in(1)->_idx); n->in(1)->dump();
4274 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(2) is offset_plus_k: ", n->in(2)->_idx); n->in(2)->dump();
4275 }
4276 }
4277
4278 void SWPointer::Tracer::scaled_iv_plus_offset_7(Node* n) {
4279 if(_slp->is_trace_alignment()) {
4280 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: Op_SubI PASSED", n->_idx);
4281 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(2) is scaled_iv: ", n->in(2)->_idx); n->in(2)->dump();
4282 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv_plus_offset: in(1) is offset_plus_k: ", n->in(1)->_idx); n->in(1)->dump();
4283 }
4284 }
4285
4286 void SWPointer::Tracer::scaled_iv_plus_offset_8(Node* n) {
4287 if(_slp->is_trace_alignment()) {
4288 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv_plus_offset: FAILED", n->_idx);
4289 }
4290 }
4291
4292 void SWPointer::Tracer::scaled_iv_1(Node* n) {
4293 if(_slp->is_trace_alignment()) {
4294 print_depth(); tty->print(" %d SWPointer::scaled_iv: testing node: ", n->_idx); n->dump();
4295 }
4296 }
4297
4298 void SWPointer::Tracer::scaled_iv_2(Node* n, int scale) {
4299 if(_slp->is_trace_alignment()) {
4300 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: FAILED since another _scale has been detected before", n->_idx);
4301 print_depth(); tty->print_cr(" \\ SWPointer::scaled_iv: _scale (%d) != 0", scale);
4302 }
4303 }
4304
4305 void SWPointer::Tracer::scaled_iv_3(Node* n, int scale) {
4306 if(_slp->is_trace_alignment()) {
4307 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: is iv, setting _scale = %d", n->_idx, scale);
4308 }
4309 }
4310
4311 void SWPointer::Tracer::scaled_iv_4(Node* n, int scale) {
4312 if(_slp->is_trace_alignment()) {
4313 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: Op_MulI PASSED, setting _scale = %d", n->_idx, scale);
4314 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv: in(1) is iv: ", n->in(1)->_idx); n->in(1)->dump();
4315 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv: in(2) is Con: ", n->in(2)->_idx); n->in(2)->dump();
4316 }
4317 }
4318
4319 void SWPointer::Tracer::scaled_iv_5(Node* n, int scale) {
4320 if(_slp->is_trace_alignment()) {
4321 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: Op_MulI PASSED, setting _scale = %d", n->_idx, scale);
4322 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv: in(2) is iv: ", n->in(2)->_idx); n->in(2)->dump();
4323 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv: in(1) is Con: ", n->in(1)->_idx); n->in(1)->dump();
4324 }
4325 }
4326
4327 void SWPointer::Tracer::scaled_iv_6(Node* n, int scale) {
4328 if(_slp->is_trace_alignment()) {
4329 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: Op_LShiftI PASSED, setting _scale = %d", n->_idx, scale);
4330 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv: in(1) is iv: ", n->in(1)->_idx); n->in(1)->dump();
4331 print_depth(); tty->print(" \\ %d SWPointer::scaled_iv: in(2) is Con: ", n->in(2)->_idx); n->in(2)->dump();
4332 }
4333 }
4334
4335 void SWPointer::Tracer::scaled_iv_7(Node* n) {
4336 if(_slp->is_trace_alignment()) {
4337 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: Op_ConvI2L PASSED", n->_idx);
4338 print_depth(); tty->print_cr(" \\ SWPointer::scaled_iv: in(1) %d is scaled_iv_plus_offset: ", n->in(1)->_idx);
4339 inc_depth(); inc_depth();
4340 print_depth(); n->in(1)->dump();
4341 dec_depth(); dec_depth();
4342 }
4343 }
4344
4345 void SWPointer::Tracer::scaled_iv_8(Node* n, SWPointer* tmp) {
4346 if(_slp->is_trace_alignment()) {
4347 print_depth(); tty->print(" %d SWPointer::scaled_iv: Op_LShiftL, creating tmp SWPointer: ", n->_idx); tmp->print();
4348 }
4349 }
4350
4351 void SWPointer::Tracer::scaled_iv_9(Node* n, int scale, int offset, Node* invar, bool negate_invar) {
4352 if(_slp->is_trace_alignment()) {
4353 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: Op_LShiftL PASSED, setting _scale = %d, _offset = %d", n->_idx, scale, offset);
4354 print_depth(); tty->print_cr(" \\ SWPointer::scaled_iv: in(1) [%d] is scaled_iv_plus_offset, in(2) [%d] used to scale: _scale = %d, _offset = %d",
4355 n->in(1)->_idx, n->in(2)->_idx, scale, offset);
4356 if (invar != NULL) {
4357 print_depth(); tty->print_cr(" \\ SWPointer::scaled_iv: scaled invariant: %c[%d]", (negate_invar?'-':'+'), invar->_idx);
4358 }
4359 inc_depth(); inc_depth();
4360 print_depth(); n->in(1)->dump();
4361 print_depth(); n->in(2)->dump();
4362 if (invar != NULL) {
4363 print_depth(); invar->dump();
4364 }
4365 dec_depth(); dec_depth();
4366 }
4367 }
4368
4369 void SWPointer::Tracer::scaled_iv_10(Node* n) {
4370 if(_slp->is_trace_alignment()) {
4371 print_depth(); tty->print_cr(" %d SWPointer::scaled_iv: FAILED", n->_idx);
4372 }
4373 }
4374
4375 void SWPointer::Tracer::offset_plus_k_1(Node* n) {
4376 if(_slp->is_trace_alignment()) {
4377 print_depth(); tty->print(" %d SWPointer::offset_plus_k: testing node: ", n->_idx); n->dump();
4378 }
4379 }
4380
4381 void SWPointer::Tracer::offset_plus_k_2(Node* n, int _offset) {
4382 if(_slp->is_trace_alignment()) {
4383 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: Op_ConI PASSED, setting _offset = %d", n->_idx, _offset);
4384 }
4385 }
4386
4387 void SWPointer::Tracer::offset_plus_k_3(Node* n, int _offset) {
4388 if(_slp->is_trace_alignment()) {
4389 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: Op_ConL PASSED, setting _offset = %d", n->_idx, _offset);
4390 }
4391 }
4392
4393 void SWPointer::Tracer::offset_plus_k_4(Node* n) {
4394 if(_slp->is_trace_alignment()) {
4395 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: FAILED", n->_idx);
4396 print_depth(); tty->print_cr(" \\ " JLONG_FORMAT " SWPointer::offset_plus_k: Op_ConL FAILED, k is too big", n->get_long());
4397 }
4398 }
4399
4400 void SWPointer::Tracer::offset_plus_k_5(Node* n, Node* _invar) {
4401 if(_slp->is_trace_alignment()) {
4402 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: FAILED since another invariant has been detected before", n->_idx);
4403 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: _invar != NULL: ", _invar->_idx); _invar->dump();
4404 }
4405 }
4406
4407 void SWPointer::Tracer::offset_plus_k_6(Node* n, Node* _invar, bool _negate_invar, int _offset) {
4408 if(_slp->is_trace_alignment()) {
4409 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: Op_AddI PASSED, setting _negate_invar = %d, _invar = %d, _offset = %d",
4410 n->_idx, _negate_invar, _invar->_idx, _offset);
4411 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(2) is Con: ", n->in(2)->_idx); n->in(2)->dump();
4412 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(1) is invariant: ", _invar->_idx); _invar->dump();
4413 }
4414 }
4415
4416 void SWPointer::Tracer::offset_plus_k_7(Node* n, Node* _invar, bool _negate_invar, int _offset) {
4417 if(_slp->is_trace_alignment()) {
4418 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: Op_AddI PASSED, setting _negate_invar = %d, _invar = %d, _offset = %d",
4419 n->_idx, _negate_invar, _invar->_idx, _offset);
4420 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(1) is Con: ", n->in(1)->_idx); n->in(1)->dump();
4421 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(2) is invariant: ", _invar->_idx); _invar->dump();
4422 }
4423 }
4424
4425 void SWPointer::Tracer::offset_plus_k_8(Node* n, Node* _invar, bool _negate_invar, int _offset) {
4426 if(_slp->is_trace_alignment()) {
4427 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: Op_SubI is PASSED, setting _negate_invar = %d, _invar = %d, _offset = %d",
4428 n->_idx, _negate_invar, _invar->_idx, _offset);
4429 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(2) is Con: ", n->in(2)->_idx); n->in(2)->dump();
4430 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(1) is invariant: ", _invar->_idx); _invar->dump();
4431 }
4432 }
4433
4434 void SWPointer::Tracer::offset_plus_k_9(Node* n, Node* _invar, bool _negate_invar, int _offset) {
4435 if(_slp->is_trace_alignment()) {
4436 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: Op_SubI PASSED, setting _negate_invar = %d, _invar = %d, _offset = %d", n->_idx, _negate_invar, _invar->_idx, _offset);
4437 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(1) is Con: ", n->in(1)->_idx); n->in(1)->dump();
4438 print_depth(); tty->print(" \\ %d SWPointer::offset_plus_k: in(2) is invariant: ", _invar->_idx); _invar->dump();
4439 }
4440 }
4441
4442 void SWPointer::Tracer::offset_plus_k_10(Node* n, Node* _invar, bool _negate_invar, int _offset) {
4443 if(_slp->is_trace_alignment()) {
4444 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: PASSED, setting _negate_invar = %d, _invar = %d, _offset = %d", n->_idx, _negate_invar, _invar->_idx, _offset);
4445 print_depth(); tty->print_cr(" \\ %d SWPointer::offset_plus_k: is invariant", n->_idx);
4446 }
4447 }
4448
4449 void SWPointer::Tracer::offset_plus_k_11(Node* n) {
4450 if(_slp->is_trace_alignment()) {
4451 print_depth(); tty->print_cr(" %d SWPointer::offset_plus_k: FAILED", n->_idx);
4452 }
4453 }
4454
4455 #endif
4456 // ========================= OrderedPair =====================
4457
4458 const OrderedPair OrderedPair::initial;
4459
4460 // ========================= SWNodeInfo =====================
4461
4462 const SWNodeInfo SWNodeInfo::initial;
4463
4464
4465 // ============================ DepGraph ===========================
4466
4467 //------------------------------make_node---------------------------
4468 // Make a new dependence graph node for an ideal node.
4469 DepMem* DepGraph::make_node(Node* node) {
4470 DepMem* m = new (_arena) DepMem(node);
4471 if (node != NULL) {
4472 assert(_map.at_grow(node->_idx) == NULL, "one init only");
4473 _map.at_put_grow(node->_idx, m);
4474 }
4475 return m;
4476 }
4477
4478 //------------------------------make_edge---------------------------
4479 // Make a new dependence graph edge from dpred -> dsucc
4480 DepEdge* DepGraph::make_edge(DepMem* dpred, DepMem* dsucc) {
4481 DepEdge* e = new (_arena) DepEdge(dpred, dsucc, dsucc->in_head(), dpred->out_head());
4482 dpred->set_out_head(e);
4483 dsucc->set_in_head(e);
4484 return e;
4485 }
4486
4487 // ========================== DepMem ========================
4488
4489 //------------------------------in_cnt---------------------------
4490 int DepMem::in_cnt() {
4491 int ct = 0;
4492 for (DepEdge* e = _in_head; e != NULL; e = e->next_in()) ct++;
4493 return ct;
4494 }
4495
4496 //------------------------------out_cnt---------------------------
4497 int DepMem::out_cnt() {
4498 int ct = 0;
4499 for (DepEdge* e = _out_head; e != NULL; e = e->next_out()) ct++;
4500 return ct;
4501 }
4502
4503 //------------------------------print-----------------------------
4504 void DepMem::print() {
4505 #ifndef PRODUCT
4506 tty->print(" DepNode %d (", _node->_idx);
4507 for (DepEdge* p = _in_head; p != NULL; p = p->next_in()) {
4508 Node* pred = p->pred()->node();
4509 tty->print(" %d", pred != NULL ? pred->_idx : 0);
4510 }
4511 tty->print(") [");
4512 for (DepEdge* s = _out_head; s != NULL; s = s->next_out()) {
4513 Node* succ = s->succ()->node();
4514 tty->print(" %d", succ != NULL ? succ->_idx : 0);
4515 }
4516 tty->print_cr(" ]");
4517 #endif
4518 }
4519
4520 // =========================== DepEdge =========================
4521
4522 //------------------------------DepPreds---------------------------
4523 void DepEdge::print() {
4524 #ifndef PRODUCT
4525 tty->print_cr("DepEdge: %d [ %d ]", _pred->node()->_idx, _succ->node()->_idx);
4526 #endif
4527 }
4528
4529 // =========================== DepPreds =========================
4530 // Iterator over predecessor edges in the dependence graph.
4531
4532 //------------------------------DepPreds---------------------------
4533 DepPreds::DepPreds(Node* n, DepGraph& dg) {
4534 _n = n;
4535 _done = false;
4536 if (_n->is_Store() || _n->is_Load()) {
4537 _next_idx = MemNode::Address;
4538 _end_idx = n->req();
4539 _dep_next = dg.dep(_n)->in_head();
4540 } else if (_n->is_Mem()) {
4541 _next_idx = 0;
4542 _end_idx = 0;
4543 _dep_next = dg.dep(_n)->in_head();
4544 } else {
4545 _next_idx = 1;
4546 _end_idx = _n->req();
4547 _dep_next = NULL;
4548 }
4549 next();
4550 }
4551
4552 //------------------------------next---------------------------
4553 void DepPreds::next() {
4554 if (_dep_next != NULL) {
4555 _current = _dep_next->pred()->node();
4556 _dep_next = _dep_next->next_in();
4557 } else if (_next_idx < _end_idx) {
4558 _current = _n->in(_next_idx++);
4559 } else {
4560 _done = true;
4561 }
4562 }
4563
4564 // =========================== DepSuccs =========================
4565 // Iterator over successor edges in the dependence graph.
4566
4567 //------------------------------DepSuccs---------------------------
4568 DepSuccs::DepSuccs(Node* n, DepGraph& dg) {
4569 _n = n;
4570 _done = false;
4571 if (_n->is_Load()) {
4572 _next_idx = 0;
4573 _end_idx = _n->outcnt();
4574 _dep_next = dg.dep(_n)->out_head();
4575 } else if (_n->is_Mem() || (_n->is_Phi() && _n->bottom_type() == Type::MEMORY)) {
4576 _next_idx = 0;
4577 _end_idx = 0;
4578 _dep_next = dg.dep(_n)->out_head();
4579 } else {
4580 _next_idx = 0;
4581 _end_idx = _n->outcnt();
4582 _dep_next = NULL;
4583 }
4584 next();
4585 }
4586
4587 //-------------------------------next---------------------------
4588 void DepSuccs::next() {
4589 if (_dep_next != NULL) {
4590 _current = _dep_next->succ()->node();
4591 _dep_next = _dep_next->next_out();
4592 } else if (_next_idx < _end_idx) {
4593 _current = _n->raw_out(_next_idx++);
4594 } else {
4595 _done = true;
4596 }
4597 }
4598
4599 //
4600 // --------------------------------- vectorization/simd -----------------------------------
4601 //
4602 bool SuperWord::same_origin_idx(Node* a, Node* b) const {
4603 return a != NULL && b != NULL && _clone_map.same_idx(a->_idx, b->_idx);
4604 }
4605 bool SuperWord::same_generation(Node* a, Node* b) const {
4606 return a != NULL && b != NULL && _clone_map.same_gen(a->_idx, b->_idx);
4607 }
4608
4609 Node* SuperWord::find_phi_for_mem_dep(LoadNode* ld) {
4610 assert(in_bb(ld), "must be in block");
4611 if (_clone_map.gen(ld->_idx) == _ii_first) {
4612 #ifndef PRODUCT
4613 if (_vector_loop_debug) {
4614 tty->print_cr("SuperWord::find_phi_for_mem_dep _clone_map.gen(ld->_idx)=%d",
4615 _clone_map.gen(ld->_idx));
4616 }
4617 #endif
4618 return NULL; //we think that any ld in the first gen being vectorizable
4619 }
4620
4621 Node* mem = ld->in(MemNode::Memory);
4622 if (mem->outcnt() <= 1) {
4623 // we don't want to remove the only edge from mem node to load
4624 #ifndef PRODUCT
4625 if (_vector_loop_debug) {
4626 tty->print_cr("SuperWord::find_phi_for_mem_dep input node %d to load %d has no other outputs and edge mem->load cannot be removed",
4627 mem->_idx, ld->_idx);
4628 ld->dump();
4629 mem->dump();
4630 }
4631 #endif
4632 return NULL;
4633 }
4634 if (!in_bb(mem) || same_generation(mem, ld)) {
4635 #ifndef PRODUCT
4636 if (_vector_loop_debug) {
4637 tty->print_cr("SuperWord::find_phi_for_mem_dep _clone_map.gen(mem->_idx)=%d",
4638 _clone_map.gen(mem->_idx));
4639 }
4640 #endif
4641 return NULL; // does not depend on loop volatile node or depends on the same generation
4642 }
4643
4644 //otherwise first node should depend on mem-phi
4645 Node* first = first_node(ld);
4646 assert(first->is_Load(), "must be Load");
4647 Node* phi = first->as_Load()->in(MemNode::Memory);
4648 if (!phi->is_Phi() || phi->bottom_type() != Type::MEMORY) {
4649 #ifndef PRODUCT
4650 if (_vector_loop_debug) {
4651 tty->print_cr("SuperWord::find_phi_for_mem_dep load is not vectorizable node, since it's `first` does not take input from mem phi");
4652 ld->dump();
4653 first->dump();
4654 }
4655 #endif
4656 return NULL;
4657 }
4658
4659 Node* tail = 0;
4660 for (int m = 0; m < _mem_slice_head.length(); m++) {
4661 if (_mem_slice_head.at(m) == phi) {
4662 tail = _mem_slice_tail.at(m);
4663 }
4664 }
4665 if (tail == 0) { //test that found phi is in the list _mem_slice_head
4666 #ifndef PRODUCT
4667 if (_vector_loop_debug) {
4668 tty->print_cr("SuperWord::find_phi_for_mem_dep load %d is not vectorizable node, its phi %d is not _mem_slice_head",
4669 ld->_idx, phi->_idx);
4670 ld->dump();
4671 phi->dump();
4672 }
4673 #endif
4674 return NULL;
4675 }
4676
4677 // now all conditions are met
4678 return phi;
4679 }
4680
4681 Node* SuperWord::first_node(Node* nd) {
4682 for (int ii = 0; ii < _iteration_first.length(); ii++) {
4683 Node* nnn = _iteration_first.at(ii);
4684 if (same_origin_idx(nnn, nd)) {
4685 #ifndef PRODUCT
4686 if (_vector_loop_debug) {
4687 tty->print_cr("SuperWord::first_node: %d is the first iteration node for %d (_clone_map.idx(nnn->_idx) = %d)",
4688 nnn->_idx, nd->_idx, _clone_map.idx(nnn->_idx));
4689 }
4690 #endif
4691 return nnn;
4692 }
4693 }
4694
4695 #ifndef PRODUCT
4696 if (_vector_loop_debug) {
4697 tty->print_cr("SuperWord::first_node: did not find first iteration node for %d (_clone_map.idx(nd->_idx)=%d)",
4698 nd->_idx, _clone_map.idx(nd->_idx));
4699 }
4700 #endif
4701 return 0;
4702 }
4703
4704 Node* SuperWord::last_node(Node* nd) {
4705 for (int ii = 0; ii < _iteration_last.length(); ii++) {
4706 Node* nnn = _iteration_last.at(ii);
4707 if (same_origin_idx(nnn, nd)) {
4708 #ifndef PRODUCT
4709 if (_vector_loop_debug) {
4710 tty->print_cr("SuperWord::last_node _clone_map.idx(nnn->_idx)=%d, _clone_map.idx(nd->_idx)=%d",
4711 _clone_map.idx(nnn->_idx), _clone_map.idx(nd->_idx));
4712 }
4713 #endif
4714 return nnn;
4715 }
4716 }
4717 return 0;
4718 }
4719
4720 int SuperWord::mark_generations() {
4721 Node *ii_err = NULL, *tail_err = NULL;
4722 for (int i = 0; i < _mem_slice_head.length(); i++) {
4723 Node* phi = _mem_slice_head.at(i);
4724 assert(phi->is_Phi(), "must be phi");
4725
4726 Node* tail = _mem_slice_tail.at(i);
4727 if (_ii_last == -1) {
4728 tail_err = tail;
4729 _ii_last = _clone_map.gen(tail->_idx);
4730 }
4731 else if (_ii_last != _clone_map.gen(tail->_idx)) {
4732 #ifndef PRODUCT
4733 if (TraceSuperWord && Verbose) {
4734 tty->print_cr("SuperWord::mark_generations _ii_last error - found different generations in two tail nodes ");
4735 tail->dump();
4736 tail_err->dump();
4737 }
4738 #endif
4739 return -1;
4740 }
4741
4742 // find first iteration in the loop
4743 for (DUIterator_Fast imax, i = phi->fast_outs(imax); i < imax; i++) {
4744 Node* ii = phi->fast_out(i);
4745 if (in_bb(ii) && ii->is_Store()) { // we speculate that normally Stores of one and one only generation have deps from mem phi
4746 if (_ii_first == -1) {
4747 ii_err = ii;
4748 _ii_first = _clone_map.gen(ii->_idx);
4749 } else if (_ii_first != _clone_map.gen(ii->_idx)) {
4750 #ifndef PRODUCT
4751 if (TraceSuperWord && Verbose) {
4752 tty->print_cr("SuperWord::mark_generations: _ii_first was found before and not equal to one in this node (%d)", _ii_first);
4753 ii->dump();
4754 if (ii_err!= 0) {
4755 ii_err->dump();
4756 }
4757 }
4758 #endif
4759 return -1; // this phi has Stores from different generations of unroll and cannot be simd/vectorized
4760 }
4761 }
4762 }//for (DUIterator_Fast imax,
4763 }//for (int i...
4764
4765 if (_ii_first == -1 || _ii_last == -1) {
4766 if (TraceSuperWord && Verbose) {
4767 tty->print_cr("SuperWord::mark_generations unknown error, something vent wrong");
4768 }
4769 return -1; // something vent wrong
4770 }
4771 // collect nodes in the first and last generations
4772 assert(_iteration_first.length() == 0, "_iteration_first must be empty");
4773 assert(_iteration_last.length() == 0, "_iteration_last must be empty");
4774 for (int j = 0; j < _block.length(); j++) {
4775 Node* n = _block.at(j);
4776 node_idx_t gen = _clone_map.gen(n->_idx);
4777 if ((signed)gen == _ii_first) {
4778 _iteration_first.push(n);
4779 } else if ((signed)gen == _ii_last) {
4780 _iteration_last.push(n);
4781 }
4782 }
4783
4784 // building order of iterations
4785 if (_ii_order.length() == 0 && ii_err != 0) {
4786 assert(in_bb(ii_err) && ii_err->is_Store(), "should be Store in bb");
4787 Node* nd = ii_err;
4788 while(_clone_map.gen(nd->_idx) != _ii_last) {
4789 _ii_order.push(_clone_map.gen(nd->_idx));
4790 bool found = false;
4791 for (DUIterator_Fast imax, i = nd->fast_outs(imax); i < imax; i++) {
4792 Node* use = nd->fast_out(i);
4793 if (same_origin_idx(use, nd) && use->as_Store()->in(MemNode::Memory) == nd) {
4794 found = true;
4795 nd = use;
4796 break;
4797 }
4798 }//for
4799
4800 if (found == false) {
4801 if (TraceSuperWord && Verbose) {
4802 tty->print_cr("SuperWord::mark_generations: Cannot build order of iterations - no dependent Store for %d", nd->_idx);
4803 }
4804 _ii_order.clear();
4805 return -1;
4806 }
4807 } //while
4808 _ii_order.push(_clone_map.gen(nd->_idx));
4809 }
4810
4811 #ifndef PRODUCT
4812 if (_vector_loop_debug) {
4813 tty->print_cr("SuperWord::mark_generations");
4814 tty->print_cr("First generation (%d) nodes:", _ii_first);
4815 for (int ii = 0; ii < _iteration_first.length(); ii++) _iteration_first.at(ii)->dump();
4816 tty->print_cr("Last generation (%d) nodes:", _ii_last);
4817 for (int ii = 0; ii < _iteration_last.length(); ii++) _iteration_last.at(ii)->dump();
4818 tty->print_cr(" ");
4819
4820 tty->print("SuperWord::List of generations: ");
4821 for (int jj = 0; jj < _ii_order.length(); ++jj) {
4822 tty->print("%d:%d ", jj, _ii_order.at(jj));
4823 }
4824 tty->print_cr(" ");
4825 }
4826 #endif
4827
4828 return _ii_first;
4829 }
4830
4831 bool SuperWord::fix_commutative_inputs(Node* gold, Node* fix) {
4832 assert(gold->is_Add() && fix->is_Add() || gold->is_Mul() && fix->is_Mul(), "should be only Add or Mul nodes");
4833 assert(same_origin_idx(gold, fix), "should be clones of the same node");
4834 Node* gin1 = gold->in(1);
4835 Node* gin2 = gold->in(2);
4836 Node* fin1 = fix->in(1);
4837 Node* fin2 = fix->in(2);
4838 bool swapped = false;
4839
4840 if (in_bb(gin1) && in_bb(gin2) && in_bb(fin1) && in_bb(fin2)) {
4841 if (same_origin_idx(gin1, fin1) &&
4842 same_origin_idx(gin2, fin2)) {
4843 return true; // nothing to fix
4844 }
4845 if (same_origin_idx(gin1, fin2) &&
4846 same_origin_idx(gin2, fin1)) {
4847 fix->swap_edges(1, 2);
4848 swapped = true;
4849 }
4850 }
4851 // at least one input comes from outside of bb
4852 if (gin1->_idx == fin1->_idx) {
4853 return true; // nothing to fix
4854 }
4855 if (!swapped && (gin1->_idx == fin2->_idx || gin2->_idx == fin1->_idx)) { //swapping is expensive, check condition first
4856 fix->swap_edges(1, 2);
4857 swapped = true;
4858 }
4859
4860 if (swapped) {
4861 #ifndef PRODUCT
4862 if (_vector_loop_debug) {
4863 tty->print_cr("SuperWord::fix_commutative_inputs: fixed node %d", fix->_idx);
4864 }
4865 #endif
4866 return true;
4867 }
4868
4869 if (TraceSuperWord && Verbose) {
4870 tty->print_cr("SuperWord::fix_commutative_inputs: cannot fix node %d", fix->_idx);
4871 }
4872
4873 return false;
4874 }
4875
4876 bool SuperWord::pack_parallel() {
4877 #ifndef PRODUCT
4878 if (_vector_loop_debug) {
4879 tty->print_cr("SuperWord::pack_parallel: START");
4880 }
4881 #endif
4882
4883 _packset.clear();
4884
4885 if (_ii_order.is_empty()) {
4886 #ifndef PRODUCT
4887 if (_vector_loop_debug) {
4888 tty->print_cr("SuperWord::pack_parallel: EMPTY");
4889 }
4890 #endif
4891 return false;
4892 }
4893
4894 for (int ii = 0; ii < _iteration_first.length(); ii++) {
4895 Node* nd = _iteration_first.at(ii);
4896 if (in_bb(nd) && (nd->is_Load() || nd->is_Store() || nd->is_Add() || nd->is_Mul())) {
4897 Node_List* pk = new Node_List();
4898 pk->push(nd);
4899 for (int gen = 1; gen < _ii_order.length(); ++gen) {
4900 for (int kk = 0; kk < _block.length(); kk++) {
4901 Node* clone = _block.at(kk);
4902 if (same_origin_idx(clone, nd) &&
4903 _clone_map.gen(clone->_idx) == _ii_order.at(gen)) {
4904 if (nd->is_Add() || nd->is_Mul()) {
4905 fix_commutative_inputs(nd, clone);
4906 }
4907 pk->push(clone);
4908 if (pk->size() == 4) {
4909 _packset.append(pk);
4910 #ifndef PRODUCT
4911 if (_vector_loop_debug) {
4912 tty->print_cr("SuperWord::pack_parallel: added pack ");
4913 pk->dump();
4914 }
4915 #endif
4916 if (_clone_map.gen(clone->_idx) != _ii_last) {
4917 pk = new Node_List();
4918 }
4919 }
4920 break;
4921 }
4922 }
4923 }//for
4924 }//if
4925 }//for
4926
4927 #ifndef PRODUCT
4928 if (_vector_loop_debug) {
4929 tty->print_cr("SuperWord::pack_parallel: END");
4930 }
4931 #endif
4932
4933 return true;
4934 }
4935
4936 bool SuperWord::hoist_loads_in_graph() {
4937 GrowableArray<Node*> loads;
4938
4939 #ifndef PRODUCT
4940 if (_vector_loop_debug) {
4941 tty->print_cr("SuperWord::hoist_loads_in_graph: total number _mem_slice_head.length() = %d", _mem_slice_head.length());
4942 }
4943 #endif
4944
4945 for (int i = 0; i < _mem_slice_head.length(); i++) {
4946 Node* n = _mem_slice_head.at(i);
4947 if ( !in_bb(n) || !n->is_Phi() || n->bottom_type() != Type::MEMORY) {
4948 if (TraceSuperWord && Verbose) {
4949 tty->print_cr("SuperWord::hoist_loads_in_graph: skipping unexpected node n=%d", n->_idx);
4950 }
4951 continue;
4952 }
4953
4954 #ifndef PRODUCT
4955 if (_vector_loop_debug) {
4956 tty->print_cr("SuperWord::hoist_loads_in_graph: processing phi %d = _mem_slice_head.at(%d);", n->_idx, i);
4957 }
4958 #endif
4959
4960 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
4961 Node* ld = n->fast_out(i);
4962 if (ld->is_Load() && ld->as_Load()->in(MemNode::Memory) == n && in_bb(ld)) {
4963 for (int i = 0; i < _block.length(); i++) {
4964 Node* ld2 = _block.at(i);
4965 if (ld2->is_Load() && same_origin_idx(ld, ld2) &&
4966 !same_generation(ld, ld2)) { // <= do not collect the first generation ld
4967 #ifndef PRODUCT
4968 if (_vector_loop_debug) {
4969 tty->print_cr("SuperWord::hoist_loads_in_graph: will try to hoist load ld2->_idx=%d, cloned from %d (ld->_idx=%d)",
4970 ld2->_idx, _clone_map.idx(ld->_idx), ld->_idx);
4971 }
4972 #endif
4973 // could not do on-the-fly, since iterator is immutable
4974 loads.push(ld2);
4975 }
4976 }// for
4977 }//if
4978 }//for (DUIterator_Fast imax,
4979 }//for (int i = 0; i
4980
4981 for (int i = 0; i < loads.length(); i++) {
4982 LoadNode* ld = loads.at(i)->as_Load();
4983 Node* phi = find_phi_for_mem_dep(ld);
4984 if (phi != NULL) {
4985 #ifndef PRODUCT
4986 if (_vector_loop_debug) {
4987 tty->print_cr("SuperWord::hoist_loads_in_graph replacing MemNode::Memory(%d) edge in %d with one from %d",
4988 MemNode::Memory, ld->_idx, phi->_idx);
4989 }
4990 #endif
4991 _igvn.replace_input_of(ld, MemNode::Memory, phi);
4992 }
4993 }//for
4994
4995 restart(); // invalidate all basic structures, since we rebuilt the graph
4996
4997 if (TraceSuperWord && Verbose) {
4998 tty->print_cr("\nSuperWord::hoist_loads_in_graph() the graph was rebuilt, all structures invalidated and need rebuild");
4999 }
5000
5001 return true;
5002 }