Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/loopnode.hpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_OPTO_LOOPNODE_HPP |
26 #define SHARE_VM_OPTO_LOOPNODE_HPP | |
27 | |
28 #include "opto/cfgnode.hpp" | |
29 #include "opto/multnode.hpp" | |
30 #include "opto/phaseX.hpp" | |
31 #include "opto/subnode.hpp" | |
32 #include "opto/type.hpp" | |
33 | |
0 | 34 class CmpNode; |
35 class CountedLoopEndNode; | |
36 class CountedLoopNode; | |
37 class IdealLoopTree; | |
38 class LoopNode; | |
39 class Node; | |
40 class PhaseIdealLoop; | |
41 class VectorSet; | |
1172 | 42 class Invariance; |
0 | 43 struct small_cache; |
44 | |
45 // | |
46 // I D E A L I Z E D L O O P S | |
47 // | |
48 // Idealized loops are the set of loops I perform more interesting | |
49 // transformations on, beyond simple hoisting. | |
50 | |
51 //------------------------------LoopNode--------------------------------------- | |
52 // Simple loop header. Fall in path on left, loop-back path on right. | |
53 class LoopNode : public RegionNode { | |
54 // Size is bigger to hold the flags. However, the flags do not change | |
55 // the semantics so it does not appear in the hash & cmp functions. | |
56 virtual uint size_of() const { return sizeof(*this); } | |
57 protected: | |
58 short _loop_flags; | |
59 // Names for flag bitfields | |
2465 | 60 enum { Normal=0, Pre=1, Main=2, Post=3, PreMainPostFlagsMask=3, |
61 MainHasNoPreLoop=4, | |
62 HasExactTripCount=8, | |
63 InnerLoop=16, | |
64 PartialPeelLoop=32, | |
65 PartialPeelFailed=64 }; | |
0 | 66 char _unswitch_count; |
67 enum { _unswitch_max=3 }; | |
68 | |
69 public: | |
70 // Names for edge indices | |
71 enum { Self=0, EntryControl, LoopBackControl }; | |
72 | |
2465 | 73 int is_inner_loop() const { return _loop_flags & InnerLoop; } |
74 void set_inner_loop() { _loop_flags |= InnerLoop; } | |
0 | 75 |
2465 | 76 int is_partial_peel_loop() const { return _loop_flags & PartialPeelLoop; } |
77 void set_partial_peel_loop() { _loop_flags |= PartialPeelLoop; } | |
78 int partial_peel_has_failed() const { return _loop_flags & PartialPeelFailed; } | |
79 void mark_partial_peel_failed() { _loop_flags |= PartialPeelFailed; } | |
0 | 80 |
81 int unswitch_max() { return _unswitch_max; } | |
82 int unswitch_count() { return _unswitch_count; } | |
83 void set_unswitch_count(int val) { | |
84 assert (val <= unswitch_max(), "too many unswitches"); | |
85 _unswitch_count = val; | |
86 } | |
87 | |
88 LoopNode( Node *entry, Node *backedge ) : RegionNode(3), _loop_flags(0), _unswitch_count(0) { | |
89 init_class_id(Class_Loop); | |
90 init_req(EntryControl, entry); | |
91 init_req(LoopBackControl, backedge); | |
92 } | |
93 | |
94 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
95 virtual int Opcode() const; | |
96 bool can_be_counted_loop(PhaseTransform* phase) const { | |
97 return req() == 3 && in(0) != NULL && | |
98 in(1) != NULL && phase->type(in(1)) != Type::TOP && | |
99 in(2) != NULL && phase->type(in(2)) != Type::TOP; | |
100 } | |
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101 bool is_valid_counted_loop() const; |
0 | 102 #ifndef PRODUCT |
103 virtual void dump_spec(outputStream *st) const; | |
104 #endif | |
105 }; | |
106 | |
107 //------------------------------Counted Loops---------------------------------- | |
108 // Counted loops are all trip-counted loops, with exactly 1 trip-counter exit | |
109 // path (and maybe some other exit paths). The trip-counter exit is always | |
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110 // last in the loop. The trip-counter have to stride by a constant; |
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111 // the exit value is also loop invariant. |
0 | 112 |
113 // CountedLoopNodes and CountedLoopEndNodes come in matched pairs. The | |
114 // CountedLoopNode has the incoming loop control and the loop-back-control | |
115 // which is always the IfTrue before the matching CountedLoopEndNode. The | |
116 // CountedLoopEndNode has an incoming control (possibly not the | |
117 // CountedLoopNode if there is control flow in the loop), the post-increment | |
118 // trip-counter value, and the limit. The trip-counter value is always of | |
119 // the form (Op old-trip-counter stride). The old-trip-counter is produced | |
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120 // by a Phi connected to the CountedLoopNode. The stride is constant. |
0 | 121 // The Op is any commutable opcode, including Add, Mul, Xor. The |
122 // CountedLoopEndNode also takes in the loop-invariant limit value. | |
123 | |
124 // From a CountedLoopNode I can reach the matching CountedLoopEndNode via the | |
125 // loop-back control. From CountedLoopEndNodes I can reach CountedLoopNodes | |
126 // via the old-trip-counter from the Op node. | |
127 | |
128 //------------------------------CountedLoopNode-------------------------------- | |
129 // CountedLoopNodes head simple counted loops. CountedLoopNodes have as | |
130 // inputs the incoming loop-start control and the loop-back control, so they | |
131 // act like RegionNodes. They also take in the initial trip counter, the | |
132 // loop-invariant stride and the loop-invariant limit value. CountedLoopNodes | |
133 // produce a loop-body control and the trip counter value. Since | |
134 // CountedLoopNodes behave like RegionNodes I still have a standard CFG model. | |
135 | |
136 class CountedLoopNode : public LoopNode { | |
137 // Size is bigger to hold _main_idx. However, _main_idx does not change | |
138 // the semantics so it does not appear in the hash & cmp functions. | |
139 virtual uint size_of() const { return sizeof(*this); } | |
140 | |
141 // For Pre- and Post-loops during debugging ONLY, this holds the index of | |
142 // the Main CountedLoop. Used to assert that we understand the graph shape. | |
143 node_idx_t _main_idx; | |
144 | |
2465 | 145 // Known trip count calculated by compute_exact_trip_count() |
146 uint _trip_count; | |
0 | 147 |
148 // Expected trip count from profile data | |
149 float _profile_trip_cnt; | |
150 | |
151 // Log2 of original loop bodies in unrolled loop | |
152 int _unrolled_count_log2; | |
153 | |
154 // Node count prior to last unrolling - used to decide if | |
155 // unroll,optimize,unroll,optimize,... is making progress | |
156 int _node_count_before_unroll; | |
157 | |
158 public: | |
159 CountedLoopNode( Node *entry, Node *backedge ) | |
2465 | 160 : LoopNode(entry, backedge), _main_idx(0), _trip_count(max_juint), |
0 | 161 _profile_trip_cnt(COUNT_UNKNOWN), _unrolled_count_log2(0), |
162 _node_count_before_unroll(0) { | |
163 init_class_id(Class_CountedLoop); | |
164 // Initialize _trip_count to the largest possible value. | |
165 // Will be reset (lower) if the loop's trip count is known. | |
166 } | |
167 | |
168 virtual int Opcode() const; | |
169 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
170 | |
171 Node *init_control() const { return in(EntryControl); } | |
172 Node *back_control() const { return in(LoopBackControl); } | |
173 CountedLoopEndNode *loopexit() const; | |
174 Node *init_trip() const; | |
175 Node *stride() const; | |
176 int stride_con() const; | |
177 bool stride_is_con() const; | |
178 Node *limit() const; | |
179 Node *incr() const; | |
180 Node *phi() const; | |
181 | |
182 // Match increment with optional truncation | |
183 static Node* match_incr_with_optional_truncation(Node* expr, Node** trunc1, Node** trunc2, const TypeInt** trunc_type); | |
184 | |
185 // A 'main' loop has a pre-loop and a post-loop. The 'main' loop | |
186 // can run short a few iterations and may start a few iterations in. | |
187 // It will be RCE'd and unrolled and aligned. | |
188 | |
189 // A following 'post' loop will run any remaining iterations. Used | |
190 // during Range Check Elimination, the 'post' loop will do any final | |
191 // iterations with full checks. Also used by Loop Unrolling, where | |
192 // the 'post' loop will do any epilog iterations needed. Basically, | |
193 // a 'post' loop can not profitably be further unrolled or RCE'd. | |
194 | |
195 // A preceding 'pre' loop will run at least 1 iteration (to do peeling), | |
196 // it may do under-flow checks for RCE and may do alignment iterations | |
197 // so the following main loop 'knows' that it is striding down cache | |
198 // lines. | |
199 | |
200 // A 'main' loop that is ONLY unrolled or peeled, never RCE'd or | |
201 // Aligned, may be missing it's pre-loop. | |
2465 | 202 int is_normal_loop() const { return (_loop_flags&PreMainPostFlagsMask) == Normal; } |
203 int is_pre_loop () const { return (_loop_flags&PreMainPostFlagsMask) == Pre; } | |
204 int is_main_loop () const { return (_loop_flags&PreMainPostFlagsMask) == Main; } | |
205 int is_post_loop () const { return (_loop_flags&PreMainPostFlagsMask) == Post; } | |
206 int is_main_no_pre_loop() const { return _loop_flags & MainHasNoPreLoop; } | |
207 void set_main_no_pre_loop() { _loop_flags |= MainHasNoPreLoop; } | |
0 | 208 |
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209 int main_idx() const { return _main_idx; } |
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210 |
0 | 211 |
212 void set_pre_loop (CountedLoopNode *main) { assert(is_normal_loop(),""); _loop_flags |= Pre ; _main_idx = main->_idx; } | |
213 void set_main_loop ( ) { assert(is_normal_loop(),""); _loop_flags |= Main; } | |
214 void set_post_loop (CountedLoopNode *main) { assert(is_normal_loop(),""); _loop_flags |= Post; _main_idx = main->_idx; } | |
2465 | 215 void set_normal_loop( ) { _loop_flags &= ~PreMainPostFlagsMask; } |
216 | |
217 void set_trip_count(uint tc) { _trip_count = tc; } | |
218 uint trip_count() { return _trip_count; } | |
0 | 219 |
2465 | 220 bool has_exact_trip_count() const { return (_loop_flags & HasExactTripCount) != 0; } |
221 void set_exact_trip_count(uint tc) { | |
222 _trip_count = tc; | |
223 _loop_flags |= HasExactTripCount; | |
224 } | |
225 void set_nonexact_trip_count() { | |
226 _loop_flags &= ~HasExactTripCount; | |
227 } | |
0 | 228 |
229 void set_profile_trip_cnt(float ptc) { _profile_trip_cnt = ptc; } | |
230 float profile_trip_cnt() { return _profile_trip_cnt; } | |
231 | |
232 void double_unrolled_count() { _unrolled_count_log2++; } | |
233 int unrolled_count() { return 1 << MIN2(_unrolled_count_log2, BitsPerInt-3); } | |
234 | |
235 void set_node_count_before_unroll(int ct) { _node_count_before_unroll = ct; } | |
236 int node_count_before_unroll() { return _node_count_before_unroll; } | |
237 | |
238 #ifndef PRODUCT | |
239 virtual void dump_spec(outputStream *st) const; | |
240 #endif | |
241 }; | |
242 | |
243 //------------------------------CountedLoopEndNode----------------------------- | |
244 // CountedLoopEndNodes end simple trip counted loops. They act much like | |
245 // IfNodes. | |
246 class CountedLoopEndNode : public IfNode { | |
247 public: | |
248 enum { TestControl, TestValue }; | |
249 | |
250 CountedLoopEndNode( Node *control, Node *test, float prob, float cnt ) | |
251 : IfNode( control, test, prob, cnt) { | |
252 init_class_id(Class_CountedLoopEnd); | |
253 } | |
254 virtual int Opcode() const; | |
255 | |
256 Node *cmp_node() const { return (in(TestValue)->req() >=2) ? in(TestValue)->in(1) : NULL; } | |
257 Node *incr() const { Node *tmp = cmp_node(); return (tmp && tmp->req()==3) ? tmp->in(1) : NULL; } | |
258 Node *limit() const { Node *tmp = cmp_node(); return (tmp && tmp->req()==3) ? tmp->in(2) : NULL; } | |
259 Node *stride() const { Node *tmp = incr (); return (tmp && tmp->req()==3) ? tmp->in(2) : NULL; } | |
260 Node *phi() const { Node *tmp = incr (); return (tmp && tmp->req()==3) ? tmp->in(1) : NULL; } | |
261 Node *init_trip() const { Node *tmp = phi (); return (tmp && tmp->req()==3) ? tmp->in(1) : NULL; } | |
262 int stride_con() const; | |
263 bool stride_is_con() const { Node *tmp = stride (); return (tmp != NULL && tmp->is_Con()); } | |
264 BoolTest::mask test_trip() const { return in(TestValue)->as_Bool()->_test._test; } | |
265 CountedLoopNode *loopnode() const { | |
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266 // The CountedLoopNode that goes with this CountedLoopEndNode may |
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267 // have been optimized out by the IGVN so be cautious with the |
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268 // pattern matching on the graph |
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269 if (phi() == NULL) { |
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270 return NULL; |
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271 } |
0 | 272 Node *ln = phi()->in(0); |
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273 if (ln->is_CountedLoop() && ln->as_CountedLoop()->loopexit() == this) { |
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274 return (CountedLoopNode*)ln; |
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275 } |
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276 return NULL; |
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277 } |
0 | 278 |
279 #ifndef PRODUCT | |
280 virtual void dump_spec(outputStream *st) const; | |
281 #endif | |
282 }; | |
283 | |
284 | |
285 inline CountedLoopEndNode *CountedLoopNode::loopexit() const { | |
286 Node *bc = back_control(); | |
287 if( bc == NULL ) return NULL; | |
288 Node *le = bc->in(0); | |
289 if( le->Opcode() != Op_CountedLoopEnd ) | |
290 return NULL; | |
291 return (CountedLoopEndNode*)le; | |
292 } | |
293 inline Node *CountedLoopNode::init_trip() const { return loopexit() ? loopexit()->init_trip() : NULL; } | |
294 inline Node *CountedLoopNode::stride() const { return loopexit() ? loopexit()->stride() : NULL; } | |
295 inline int CountedLoopNode::stride_con() const { return loopexit() ? loopexit()->stride_con() : 0; } | |
296 inline bool CountedLoopNode::stride_is_con() const { return loopexit() && loopexit()->stride_is_con(); } | |
297 inline Node *CountedLoopNode::limit() const { return loopexit() ? loopexit()->limit() : NULL; } | |
298 inline Node *CountedLoopNode::incr() const { return loopexit() ? loopexit()->incr() : NULL; } | |
299 inline Node *CountedLoopNode::phi() const { return loopexit() ? loopexit()->phi() : NULL; } | |
300 | |
3345 | 301 //------------------------------LoopLimitNode----------------------------- |
302 // Counted Loop limit node which represents exact final iterator value: | |
303 // trip_count = (limit - init_trip + stride - 1)/stride | |
304 // final_value= trip_count * stride + init_trip. | |
305 // Use HW instructions to calculate it when it can overflow in integer. | |
306 // Note, final_value should fit into integer since counted loop has | |
307 // limit check: limit <= max_int-stride. | |
308 class LoopLimitNode : public Node { | |
309 enum { Init=1, Limit=2, Stride=3 }; | |
310 public: | |
311 LoopLimitNode( Compile* C, Node *init, Node *limit, Node *stride ) : Node(0,init,limit,stride) { | |
312 // Put it on the Macro nodes list to optimize during macro nodes expansion. | |
313 init_flags(Flag_is_macro); | |
314 C->add_macro_node(this); | |
315 } | |
316 virtual int Opcode() const; | |
317 virtual const Type *bottom_type() const { return TypeInt::INT; } | |
318 virtual uint ideal_reg() const { return Op_RegI; } | |
319 virtual const Type *Value( PhaseTransform *phase ) const; | |
320 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
321 virtual Node *Identity( PhaseTransform *phase ); | |
322 }; | |
0 | 323 |
324 // -----------------------------IdealLoopTree---------------------------------- | |
325 class IdealLoopTree : public ResourceObj { | |
326 public: | |
327 IdealLoopTree *_parent; // Parent in loop tree | |
328 IdealLoopTree *_next; // Next sibling in loop tree | |
329 IdealLoopTree *_child; // First child in loop tree | |
330 | |
331 // The head-tail backedge defines the loop. | |
332 // If tail is NULL then this loop has multiple backedges as part of the | |
333 // same loop. During cleanup I'll peel off the multiple backedges; merge | |
334 // them at the loop bottom and flow 1 real backedge into the loop. | |
335 Node *_head; // Head of loop | |
336 Node *_tail; // Tail of loop | |
337 inline Node *tail(); // Handle lazy update of _tail field | |
338 PhaseIdealLoop* _phase; | |
339 | |
340 Node_List _body; // Loop body for inner loops | |
341 | |
342 uint8 _nest; // Nesting depth | |
343 uint8 _irreducible:1, // True if irreducible | |
344 _has_call:1, // True if has call safepoint | |
345 _has_sfpt:1, // True if has non-call safepoint | |
346 _rce_candidate:1; // True if candidate for range check elimination | |
347 | |
6636 | 348 Node_List* _safepts; // List of safepoints in this loop |
39
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349 Node_List* _required_safept; // A inner loop cannot delete these safepts; |
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350 bool _allow_optimizations; // Allow loop optimizations |
0 | 351 |
352 IdealLoopTree( PhaseIdealLoop* phase, Node *head, Node *tail ) | |
353 : _parent(0), _next(0), _child(0), | |
354 _head(head), _tail(tail), | |
355 _phase(phase), | |
6636 | 356 _safepts(NULL), |
0 | 357 _required_safept(NULL), |
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358 _allow_optimizations(true), |
0 | 359 _nest(0), _irreducible(0), _has_call(0), _has_sfpt(0), _rce_candidate(0) |
360 { } | |
361 | |
362 // Is 'l' a member of 'this'? | |
363 int is_member( const IdealLoopTree *l ) const; // Test for nested membership | |
364 | |
365 // Set loop nesting depth. Accumulate has_call bits. | |
366 int set_nest( uint depth ); | |
367 | |
368 // Split out multiple fall-in edges from the loop header. Move them to a | |
369 // private RegionNode before the loop. This becomes the loop landing pad. | |
370 void split_fall_in( PhaseIdealLoop *phase, int fall_in_cnt ); | |
371 | |
372 // Split out the outermost loop from this shared header. | |
373 void split_outer_loop( PhaseIdealLoop *phase ); | |
374 | |
375 // Merge all the backedges from the shared header into a private Region. | |
376 // Feed that region as the one backedge to this loop. | |
377 void merge_many_backedges( PhaseIdealLoop *phase ); | |
378 | |
379 // Split shared headers and insert loop landing pads. | |
380 // Insert a LoopNode to replace the RegionNode. | |
381 // Returns TRUE if loop tree is structurally changed. | |
382 bool beautify_loops( PhaseIdealLoop *phase ); | |
383 | |
1172 | 384 // Perform optimization to use the loop predicates for null checks and range checks. |
385 // Applies to any loop level (not just the innermost one) | |
386 bool loop_predication( PhaseIdealLoop *phase); | |
387 | |
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388 // Perform iteration-splitting on inner loops. Split iterations to |
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389 // avoid range checks or one-shot null checks. Returns false if the |
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390 // current round of loop opts should stop. |
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391 bool iteration_split( PhaseIdealLoop *phase, Node_List &old_new ); |
0 | 392 |
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393 // Driver for various flavors of iteration splitting. Returns false |
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394 // if the current round of loop opts should stop. |
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395 bool iteration_split_impl( PhaseIdealLoop *phase, Node_List &old_new ); |
0 | 396 |
397 // Given dominators, try to find loops with calls that must always be | |
398 // executed (call dominates loop tail). These loops do not need non-call | |
399 // safepoints (ncsfpt). | |
400 void check_safepts(VectorSet &visited, Node_List &stack); | |
401 | |
402 // Allpaths backwards scan from loop tail, terminating each path at first safepoint | |
403 // encountered. | |
404 void allpaths_check_safepts(VectorSet &visited, Node_List &stack); | |
405 | |
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406 // Remove safepoints from loop. Optionally keeping one. |
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407 void remove_safepoints(PhaseIdealLoop* phase, bool keep_one); |
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408 |
0 | 409 // Convert to counted loops where possible |
410 void counted_loop( PhaseIdealLoop *phase ); | |
411 | |
412 // Check for Node being a loop-breaking test | |
413 Node *is_loop_exit(Node *iff) const; | |
414 | |
415 // Returns true if ctrl is executed on every complete iteration | |
416 bool dominates_backedge(Node* ctrl); | |
417 | |
418 // Remove simplistic dead code from loop body | |
419 void DCE_loop_body(); | |
420 | |
421 // Look for loop-exit tests with my 50/50 guesses from the Parsing stage. | |
422 // Replace with a 1-in-10 exit guess. | |
423 void adjust_loop_exit_prob( PhaseIdealLoop *phase ); | |
424 | |
425 // Return TRUE or FALSE if the loop should never be RCE'd or aligned. | |
426 // Useful for unrolling loops with NO array accesses. | |
427 bool policy_peel_only( PhaseIdealLoop *phase ) const; | |
428 | |
429 // Return TRUE or FALSE if the loop should be unswitched -- clone | |
430 // loop with an invariant test | |
431 bool policy_unswitching( PhaseIdealLoop *phase ) const; | |
432 | |
433 // Micro-benchmark spamming. Remove empty loops. | |
434 bool policy_do_remove_empty_loop( PhaseIdealLoop *phase ); | |
435 | |
2465 | 436 // Convert one iteration loop into normal code. |
437 bool policy_do_one_iteration_loop( PhaseIdealLoop *phase ); | |
438 | |
0 | 439 // Return TRUE or FALSE if the loop should be peeled or not. Peel if we can |
440 // make some loop-invariant test (usually a null-check) happen before the | |
441 // loop. | |
442 bool policy_peeling( PhaseIdealLoop *phase ) const; | |
443 | |
444 // Return TRUE or FALSE if the loop should be maximally unrolled. Stash any | |
445 // known trip count in the counted loop node. | |
446 bool policy_maximally_unroll( PhaseIdealLoop *phase ) const; | |
447 | |
448 // Return TRUE or FALSE if the loop should be unrolled or not. Unroll if | |
449 // the loop is a CountedLoop and the body is small enough. | |
450 bool policy_unroll( PhaseIdealLoop *phase ) const; | |
451 | |
452 // Return TRUE or FALSE if the loop should be range-check-eliminated. | |
453 // Gather a list of IF tests that are dominated by iteration splitting; | |
454 // also gather the end of the first split and the start of the 2nd split. | |
455 bool policy_range_check( PhaseIdealLoop *phase ) const; | |
456 | |
457 // Return TRUE or FALSE if the loop should be cache-line aligned. | |
458 // Gather the expression that does the alignment. Note that only | |
605 | 459 // one array base can be aligned in a loop (unless the VM guarantees |
0 | 460 // mutual alignment). Note that if we vectorize short memory ops |
461 // into longer memory ops, we may want to increase alignment. | |
462 bool policy_align( PhaseIdealLoop *phase ) const; | |
463 | |
1172 | 464 // Return TRUE if "iff" is a range check. |
465 bool is_range_check_if(IfNode *iff, PhaseIdealLoop *phase, Invariance& invar) const; | |
466 | |
2465 | 467 // Compute loop exact trip count if possible |
468 void compute_exact_trip_count( PhaseIdealLoop *phase ); | |
469 | |
0 | 470 // Compute loop trip count from profile data |
471 void compute_profile_trip_cnt( PhaseIdealLoop *phase ); | |
472 | |
473 // Reassociate invariant expressions. | |
474 void reassociate_invariants(PhaseIdealLoop *phase); | |
475 // Reassociate invariant add and subtract expressions. | |
476 Node* reassociate_add_sub(Node* n1, PhaseIdealLoop *phase); | |
477 // Return nonzero index of invariant operand if invariant and variant | |
605 | 478 // are combined with an Add or Sub. Helper for reassociate_invariants. |
0 | 479 int is_invariant_addition(Node* n, PhaseIdealLoop *phase); |
480 | |
481 // Return true if n is invariant | |
482 bool is_invariant(Node* n) const; | |
483 | |
484 // Put loop body on igvn work list | |
485 void record_for_igvn(); | |
486 | |
487 bool is_loop() { return !_irreducible && _tail && !_tail->is_top(); } | |
488 bool is_inner() { return is_loop() && _child == NULL; } | |
489 bool is_counted() { return is_loop() && _head != NULL && _head->is_CountedLoop(); } | |
490 | |
491 #ifndef PRODUCT | |
492 void dump_head( ) const; // Dump loop head only | |
493 void dump() const; // Dump this loop recursively | |
494 void verify_tree(IdealLoopTree *loop, const IdealLoopTree *parent) const; | |
495 #endif | |
496 | |
497 }; | |
498 | |
499 // -----------------------------PhaseIdealLoop--------------------------------- | |
500 // Computes the mapping from Nodes to IdealLoopTrees. Organizes IdealLoopTrees into a | |
501 // loop tree. Drives the loop-based transformations on the ideal graph. | |
502 class PhaseIdealLoop : public PhaseTransform { | |
503 friend class IdealLoopTree; | |
504 friend class SuperWord; | |
505 // Pre-computed def-use info | |
506 PhaseIterGVN &_igvn; | |
507 | |
508 // Head of loop tree | |
509 IdealLoopTree *_ltree_root; | |
510 | |
511 // Array of pre-order numbers, plus post-visited bit. | |
512 // ZERO for not pre-visited. EVEN for pre-visited but not post-visited. | |
513 // ODD for post-visited. Other bits are the pre-order number. | |
514 uint *_preorders; | |
515 uint _max_preorder; | |
516 | |
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517 const PhaseIdealLoop* _verify_me; |
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518 bool _verify_only; |
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519 |
0 | 520 // Allocate _preorders[] array |
521 void allocate_preorders() { | |
522 _max_preorder = C->unique()+8; | |
523 _preorders = NEW_RESOURCE_ARRAY(uint, _max_preorder); | |
524 memset(_preorders, 0, sizeof(uint) * _max_preorder); | |
525 } | |
526 | |
527 // Allocate _preorders[] array | |
528 void reallocate_preorders() { | |
529 if ( _max_preorder < C->unique() ) { | |
530 _preorders = REALLOC_RESOURCE_ARRAY(uint, _preorders, _max_preorder, C->unique()); | |
531 _max_preorder = C->unique(); | |
532 } | |
533 memset(_preorders, 0, sizeof(uint) * _max_preorder); | |
534 } | |
535 | |
536 // Check to grow _preorders[] array for the case when build_loop_tree_impl() | |
537 // adds new nodes. | |
538 void check_grow_preorders( ) { | |
539 if ( _max_preorder < C->unique() ) { | |
540 uint newsize = _max_preorder<<1; // double size of array | |
541 _preorders = REALLOC_RESOURCE_ARRAY(uint, _preorders, _max_preorder, newsize); | |
542 memset(&_preorders[_max_preorder],0,sizeof(uint)*(newsize-_max_preorder)); | |
543 _max_preorder = newsize; | |
544 } | |
545 } | |
546 // Check for pre-visited. Zero for NOT visited; non-zero for visited. | |
547 int is_visited( Node *n ) const { return _preorders[n->_idx]; } | |
548 // Pre-order numbers are written to the Nodes array as low-bit-set values. | |
549 void set_preorder_visited( Node *n, int pre_order ) { | |
550 assert( !is_visited( n ), "already set" ); | |
551 _preorders[n->_idx] = (pre_order<<1); | |
552 }; | |
553 // Return pre-order number. | |
554 int get_preorder( Node *n ) const { assert( is_visited(n), "" ); return _preorders[n->_idx]>>1; } | |
555 | |
556 // Check for being post-visited. | |
557 // Should be previsited already (checked with assert(is_visited(n))). | |
558 int is_postvisited( Node *n ) const { assert( is_visited(n), "" ); return _preorders[n->_idx]&1; } | |
559 | |
560 // Mark as post visited | |
561 void set_postvisited( Node *n ) { assert( !is_postvisited( n ), "" ); _preorders[n->_idx] |= 1; } | |
562 | |
563 // Set/get control node out. Set lower bit to distinguish from IdealLoopTree | |
564 // Returns true if "n" is a data node, false if it's a control node. | |
565 bool has_ctrl( Node *n ) const { return ((intptr_t)_nodes[n->_idx]) & 1; } | |
566 | |
567 // clear out dead code after build_loop_late | |
568 Node_List _deadlist; | |
569 | |
570 // Support for faster execution of get_late_ctrl()/dom_lca() | |
571 // when a node has many uses and dominator depth is deep. | |
572 Node_Array _dom_lca_tags; | |
573 void init_dom_lca_tags(); | |
574 void clear_dom_lca_tags(); | |
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575 |
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576 // Helper for debugging bad dominance relationships |
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577 bool verify_dominance(Node* n, Node* use, Node* LCA, Node* early); |
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578 |
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579 Node* compute_lca_of_uses(Node* n, Node* early, bool verify = false); |
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580 |
0 | 581 // Inline wrapper for frequent cases: |
582 // 1) only one use | |
583 // 2) a use is the same as the current LCA passed as 'n1' | |
584 Node *dom_lca_for_get_late_ctrl( Node *lca, Node *n, Node *tag ) { | |
585 assert( n->is_CFG(), "" ); | |
586 // Fast-path NULL lca | |
587 if( lca != NULL && lca != n ) { | |
588 assert( lca->is_CFG(), "" ); | |
589 // find LCA of all uses | |
590 n = dom_lca_for_get_late_ctrl_internal( lca, n, tag ); | |
591 } | |
592 return find_non_split_ctrl(n); | |
593 } | |
594 Node *dom_lca_for_get_late_ctrl_internal( Node *lca, Node *n, Node *tag ); | |
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595 |
0 | 596 // Helper function for directing control inputs away from CFG split |
597 // points. | |
598 Node *find_non_split_ctrl( Node *ctrl ) const { | |
599 if (ctrl != NULL) { | |
600 if (ctrl->is_MultiBranch()) { | |
601 ctrl = ctrl->in(0); | |
602 } | |
603 assert(ctrl->is_CFG(), "CFG"); | |
604 } | |
605 return ctrl; | |
606 } | |
607 | |
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608 bool cast_incr_before_loop(Node* incr, Node* ctrl, Node* loop); |
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609 |
0 | 610 public: |
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611 bool has_node( Node* n ) const { |
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612 guarantee(n != NULL, "No Node."); |
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613 return _nodes[n->_idx] != NULL; |
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614 } |
0 | 615 // check if transform created new nodes that need _ctrl recorded |
616 Node *get_late_ctrl( Node *n, Node *early ); | |
617 Node *get_early_ctrl( Node *n ); | |
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618 Node *get_early_ctrl_for_expensive(Node *n, Node* earliest); |
0 | 619 void set_early_ctrl( Node *n ); |
620 void set_subtree_ctrl( Node *root ); | |
621 void set_ctrl( Node *n, Node *ctrl ) { | |
622 assert( !has_node(n) || has_ctrl(n), "" ); | |
623 assert( ctrl->in(0), "cannot set dead control node" ); | |
624 assert( ctrl == find_non_split_ctrl(ctrl), "must set legal crtl" ); | |
625 _nodes.map( n->_idx, (Node*)((intptr_t)ctrl + 1) ); | |
626 } | |
627 // Set control and update loop membership | |
628 void set_ctrl_and_loop(Node* n, Node* ctrl) { | |
629 IdealLoopTree* old_loop = get_loop(get_ctrl(n)); | |
630 IdealLoopTree* new_loop = get_loop(ctrl); | |
631 if (old_loop != new_loop) { | |
632 if (old_loop->_child == NULL) old_loop->_body.yank(n); | |
633 if (new_loop->_child == NULL) new_loop->_body.push(n); | |
634 } | |
635 set_ctrl(n, ctrl); | |
636 } | |
637 // Control nodes can be replaced or subsumed. During this pass they | |
638 // get their replacement Node in slot 1. Instead of updating the block | |
639 // location of all Nodes in the subsumed block, we lazily do it. As we | |
640 // pull such a subsumed block out of the array, we write back the final | |
641 // correct block. | |
642 Node *get_ctrl( Node *i ) { | |
643 assert(has_node(i), ""); | |
644 Node *n = get_ctrl_no_update(i); | |
645 _nodes.map( i->_idx, (Node*)((intptr_t)n + 1) ); | |
646 assert(has_node(i) && has_ctrl(i), ""); | |
647 assert(n == find_non_split_ctrl(n), "must return legal ctrl" ); | |
648 return n; | |
649 } | |
1172 | 650 // true if CFG node d dominates CFG node n |
651 bool is_dominator(Node *d, Node *n); | |
652 // return get_ctrl for a data node and self(n) for a CFG node | |
653 Node* ctrl_or_self(Node* n) { | |
654 if (has_ctrl(n)) | |
655 return get_ctrl(n); | |
656 else { | |
657 assert (n->is_CFG(), "must be a CFG node"); | |
658 return n; | |
659 } | |
660 } | |
0 | 661 |
662 private: | |
23817 | 663 Node *get_ctrl_no_update_helper(Node *i) const { |
664 assert(has_ctrl(i), "should be control, not loop"); | |
665 return (Node*)(((intptr_t)_nodes[i->_idx]) & ~1); | |
666 } | |
667 | |
668 Node *get_ctrl_no_update(Node *i) const { | |
0 | 669 assert( has_ctrl(i), "" ); |
23817 | 670 Node *n = get_ctrl_no_update_helper(i); |
0 | 671 if (!n->in(0)) { |
672 // Skip dead CFG nodes | |
673 do { | |
23817 | 674 n = get_ctrl_no_update_helper(n); |
0 | 675 } while (!n->in(0)); |
676 n = find_non_split_ctrl(n); | |
677 } | |
678 return n; | |
679 } | |
680 | |
681 // Check for loop being set | |
682 // "n" must be a control node. Returns true if "n" is known to be in a loop. | |
683 bool has_loop( Node *n ) const { | |
684 assert(!has_node(n) || !has_ctrl(n), ""); | |
685 return has_node(n); | |
686 } | |
687 // Set loop | |
688 void set_loop( Node *n, IdealLoopTree *loop ) { | |
689 _nodes.map(n->_idx, (Node*)loop); | |
690 } | |
691 // Lazy-dazy update of 'get_ctrl' and 'idom_at' mechanisms. Replace | |
692 // the 'old_node' with 'new_node'. Kill old-node. Add a reference | |
693 // from old_node to new_node to support the lazy update. Reference | |
1172 | 694 // replaces loop reference, since that is not needed for dead node. |
0 | 695 public: |
23817 | 696 void lazy_update(Node *old_node, Node *new_node) { |
697 assert(old_node != new_node, "no cycles please"); | |
698 // Re-use the side array slot for this node to provide the | |
699 // forwarding pointer. | |
700 _nodes.map(old_node->_idx, (Node*)((intptr_t)new_node + 1)); | |
0 | 701 } |
23817 | 702 void lazy_replace(Node *old_node, Node *new_node) { |
703 _igvn.replace_node(old_node, new_node); | |
704 lazy_update(old_node, new_node); | |
0 | 705 } |
706 | |
707 private: | |
708 | |
709 // Place 'n' in some loop nest, where 'n' is a CFG node | |
710 void build_loop_tree(); | |
711 int build_loop_tree_impl( Node *n, int pre_order ); | |
712 // Insert loop into the existing loop tree. 'innermost' is a leaf of the | |
713 // loop tree, not the root. | |
714 IdealLoopTree *sort( IdealLoopTree *loop, IdealLoopTree *innermost ); | |
715 | |
716 // Place Data nodes in some loop nest | |
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717 void build_loop_early( VectorSet &visited, Node_List &worklist, Node_Stack &nstack ); |
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718 void build_loop_late ( VectorSet &visited, Node_List &worklist, Node_Stack &nstack ); |
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719 void build_loop_late_post ( Node* n ); |
0 | 720 |
721 // Array of immediate dominance info for each CFG node indexed by node idx | |
722 private: | |
723 uint _idom_size; | |
724 Node **_idom; // Array of immediate dominators | |
725 uint *_dom_depth; // Used for fast LCA test | |
726 GrowableArray<uint>* _dom_stk; // For recomputation of dom depth | |
727 | |
728 Node* idom_no_update(Node* d) const { | |
729 assert(d->_idx < _idom_size, "oob"); | |
730 Node* n = _idom[d->_idx]; | |
731 assert(n != NULL,"Bad immediate dominator info."); | |
732 while (n->in(0) == NULL) { // Skip dead CFG nodes | |
733 //n = n->in(1); | |
734 n = (Node*)(((intptr_t)_nodes[n->_idx]) & ~1); | |
735 assert(n != NULL,"Bad immediate dominator info."); | |
736 } | |
737 return n; | |
738 } | |
739 Node *idom(Node* d) const { | |
740 uint didx = d->_idx; | |
741 Node *n = idom_no_update(d); | |
742 _idom[didx] = n; // Lazily remove dead CFG nodes from table. | |
743 return n; | |
744 } | |
745 uint dom_depth(Node* d) const { | |
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746 guarantee(d != NULL, "Null dominator info."); |
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747 guarantee(d->_idx < _idom_size, ""); |
0 | 748 return _dom_depth[d->_idx]; |
749 } | |
750 void set_idom(Node* d, Node* n, uint dom_depth); | |
751 // Locally compute IDOM using dom_lca call | |
752 Node *compute_idom( Node *region ) const; | |
753 // Recompute dom_depth | |
754 void recompute_dom_depth(); | |
755 | |
756 // Is safept not required by an outer loop? | |
757 bool is_deleteable_safept(Node* sfpt); | |
758 | |
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759 // Replace parallel induction variable (parallel to trip counter) |
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760 void replace_parallel_iv(IdealLoopTree *loop); |
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761 |
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762 // Perform verification that the graph is valid. |
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763 PhaseIdealLoop( PhaseIterGVN &igvn) : |
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764 PhaseTransform(Ideal_Loop), |
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765 _igvn(igvn), |
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766 _dom_lca_tags(arena()), // Thread::resource_area |
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767 _verify_me(NULL), |
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768 _verify_only(true) { |
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769 build_and_optimize(false, false); |
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770 } |
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771 |
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772 // build the loop tree and perform any requested optimizations |
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773 void build_and_optimize(bool do_split_if, bool skip_loop_opts); |
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774 |
0 | 775 public: |
776 // Dominators for the sea of nodes | |
777 void Dominators(); | |
778 Node *dom_lca( Node *n1, Node *n2 ) const { | |
779 return find_non_split_ctrl(dom_lca_internal(n1, n2)); | |
780 } | |
781 Node *dom_lca_internal( Node *n1, Node *n2 ) const; | |
782 | |
783 // Compute the Ideal Node to Loop mapping | |
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784 PhaseIdealLoop( PhaseIterGVN &igvn, bool do_split_ifs, bool skip_loop_opts = false) : |
921
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785 PhaseTransform(Ideal_Loop), |
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786 _igvn(igvn), |
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787 _dom_lca_tags(arena()), // Thread::resource_area |
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788 _verify_me(NULL), |
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789 _verify_only(false) { |
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790 build_and_optimize(do_split_ifs, skip_loop_opts); |
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791 } |
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792 |
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793 // Verify that verify_me made the same decisions as a fresh run. |
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794 PhaseIdealLoop( PhaseIterGVN &igvn, const PhaseIdealLoop *verify_me) : |
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795 PhaseTransform(Ideal_Loop), |
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796 _igvn(igvn), |
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797 _dom_lca_tags(arena()), // Thread::resource_area |
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798 _verify_me(verify_me), |
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799 _verify_only(false) { |
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800 build_and_optimize(false, false); |
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801 } |
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802 |
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803 // Build and verify the loop tree without modifying the graph. This |
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804 // is useful to verify that all inputs properly dominate their uses. |
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805 static void verify(PhaseIterGVN& igvn) { |
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806 #ifdef ASSERT |
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807 PhaseIdealLoop v(igvn); |
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808 #endif |
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809 } |
0 | 810 |
811 // True if the method has at least 1 irreducible loop | |
812 bool _has_irreducible_loops; | |
813 | |
814 // Per-Node transform | |
815 virtual Node *transform( Node *a_node ) { return 0; } | |
816 | |
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817 bool is_counted_loop( Node *x, IdealLoopTree *loop ); |
0 | 818 |
3345 | 819 Node* exact_limit( IdealLoopTree *loop ); |
820 | |
0 | 821 // Return a post-walked LoopNode |
822 IdealLoopTree *get_loop( Node *n ) const { | |
823 // Dead nodes have no loop, so return the top level loop instead | |
824 if (!has_node(n)) return _ltree_root; | |
825 assert(!has_ctrl(n), ""); | |
826 return (IdealLoopTree*)_nodes[n->_idx]; | |
827 } | |
828 | |
829 // Is 'n' a (nested) member of 'loop'? | |
830 int is_member( const IdealLoopTree *loop, Node *n ) const { | |
831 return loop->is_member(get_loop(n)); } | |
832 | |
833 // This is the basic building block of the loop optimizations. It clones an | |
834 // entire loop body. It makes an old_new loop body mapping; with this | |
835 // mapping you can find the new-loop equivalent to an old-loop node. All | |
836 // new-loop nodes are exactly equal to their old-loop counterparts, all | |
837 // edges are the same. All exits from the old-loop now have a RegionNode | |
838 // that merges the equivalent new-loop path. This is true even for the | |
839 // normal "loop-exit" condition. All uses of loop-invariant old-loop values | |
840 // now come from (one or more) Phis that merge their new-loop equivalents. | |
841 // Parameter side_by_side_idom: | |
842 // When side_by_size_idom is NULL, the dominator tree is constructed for | |
843 // the clone loop to dominate the original. Used in construction of | |
844 // pre-main-post loop sequence. | |
845 // When nonnull, the clone and original are side-by-side, both are | |
846 // dominated by the passed in side_by_side_idom node. Used in | |
847 // construction of unswitched loops. | |
848 void clone_loop( IdealLoopTree *loop, Node_List &old_new, int dom_depth, | |
849 Node* side_by_side_idom = NULL); | |
850 | |
851 // If we got the effect of peeling, either by actually peeling or by | |
852 // making a pre-loop which must execute at least once, we can remove | |
853 // all loop-invariant dominated tests in the main body. | |
854 void peeled_dom_test_elim( IdealLoopTree *loop, Node_List &old_new ); | |
855 | |
856 // Generate code to do a loop peel for the given loop (and body). | |
857 // old_new is a temp array. | |
858 void do_peeling( IdealLoopTree *loop, Node_List &old_new ); | |
859 | |
860 // Add pre and post loops around the given loop. These loops are used | |
861 // during RCE, unrolling and aligning loops. | |
862 void insert_pre_post_loops( IdealLoopTree *loop, Node_List &old_new, bool peel_only ); | |
863 // If Node n lives in the back_ctrl block, we clone a private version of n | |
864 // in preheader_ctrl block and return that, otherwise return n. | |
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865 Node *clone_up_backedge_goo( Node *back_ctrl, Node *preheader_ctrl, Node *n, VectorSet &visited, Node_Stack &clones ); |
0 | 866 |
867 // Take steps to maximally unroll the loop. Peel any odd iterations, then | |
868 // unroll to do double iterations. The next round of major loop transforms | |
869 // will repeat till the doubled loop body does all remaining iterations in 1 | |
870 // pass. | |
871 void do_maximally_unroll( IdealLoopTree *loop, Node_List &old_new ); | |
872 | |
873 // Unroll the loop body one step - make each trip do 2 iterations. | |
874 void do_unroll( IdealLoopTree *loop, Node_List &old_new, bool adjust_min_trip ); | |
875 | |
876 // Return true if exp is a constant times an induction var | |
877 bool is_scaled_iv(Node* exp, Node* iv, int* p_scale); | |
878 | |
879 // Return true if exp is a scaled induction var plus (or minus) constant | |
880 bool is_scaled_iv_plus_offset(Node* exp, Node* iv, int* p_scale, Node** p_offset, int depth = 0); | |
881 | |
1172 | 882 // Create a new if above the uncommon_trap_if_pattern for the predicate to be promoted |
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883 ProjNode* create_new_if_for_predicate(ProjNode* cont_proj, Node* new_entry, |
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884 Deoptimization::DeoptReason reason); |
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885 void register_control(Node* n, IdealLoopTree *loop, Node* pred); |
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886 |
2445 | 887 // Clone loop predicates to cloned loops (peeled, unswitched) |
888 static ProjNode* clone_predicate(ProjNode* predicate_proj, Node* new_entry, | |
889 Deoptimization::DeoptReason reason, | |
890 PhaseIdealLoop* loop_phase, | |
891 PhaseIterGVN* igvn); | |
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892 |
2445 | 893 static Node* clone_loop_predicates(Node* old_entry, Node* new_entry, |
3345 | 894 bool clone_limit_check, |
2445 | 895 PhaseIdealLoop* loop_phase, |
896 PhaseIterGVN* igvn); | |
3345 | 897 Node* clone_loop_predicates(Node* old_entry, Node* new_entry, bool clone_limit_check); |
2445 | 898 |
899 static Node* skip_loop_predicates(Node* entry); | |
900 | |
901 // Find a good location to insert a predicate | |
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902 static ProjNode* find_predicate_insertion_point(Node* start_c, Deoptimization::DeoptReason reason); |
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903 // Find a predicate |
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904 static Node* find_predicate(Node* entry); |
1172 | 905 // Construct a range check for a predicate if |
3345 | 906 BoolNode* rc_predicate(IdealLoopTree *loop, Node* ctrl, |
1172 | 907 int scale, Node* offset, |
24206 | 908 Node* init, Node* limit, jint stride, |
909 Node* range, bool upper, bool &overflow); | |
1172 | 910 |
911 // Implementation of the loop predication to promote checks outside the loop | |
912 bool loop_predication_impl(IdealLoopTree *loop); | |
913 | |
914 // Helper function to collect predicate for eliminating the useless ones | |
915 void collect_potentially_useful_predicates(IdealLoopTree *loop, Unique_Node_List &predicate_opaque1); | |
916 void eliminate_useless_predicates(); | |
917 | |
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918 // Change the control input of expensive nodes to allow commoning by |
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919 // IGVN when it is guaranteed to not result in a more frequent |
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920 // execution of the expensive node. Return true if progress. |
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921 bool process_expensive_nodes(); |
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922 |
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923 // Check whether node has become unreachable |
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924 bool is_node_unreachable(Node *n) const { |
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925 return !has_node(n) || n->is_unreachable(_igvn); |
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926 } |
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927 |
0 | 928 // Eliminate range-checks and other trip-counter vs loop-invariant tests. |
929 void do_range_check( IdealLoopTree *loop, Node_List &old_new ); | |
930 | |
931 // Create a slow version of the loop by cloning the loop | |
932 // and inserting an if to select fast-slow versions. | |
933 ProjNode* create_slow_version_of_loop(IdealLoopTree *loop, | |
934 Node_List &old_new); | |
935 | |
936 // Clone loop with an invariant test (that does not exit) and | |
937 // insert a clone of the test that selects which version to | |
938 // execute. | |
939 void do_unswitching (IdealLoopTree *loop, Node_List &old_new); | |
940 | |
941 // Find candidate "if" for unswitching | |
942 IfNode* find_unswitching_candidate(const IdealLoopTree *loop) const; | |
943 | |
944 // Range Check Elimination uses this function! | |
945 // Constrain the main loop iterations so the affine function: | |
3345 | 946 // low_limit <= scale_con * I + offset < upper_limit |
0 | 947 // always holds true. That is, either increase the number of iterations in |
948 // the pre-loop or the post-loop until the condition holds true in the main | |
949 // loop. Scale_con, offset and limit are all loop invariant. | |
3345 | 950 void add_constraint( int stride_con, int scale_con, Node *offset, Node *low_limit, Node *upper_limit, Node *pre_ctrl, Node **pre_limit, Node **main_limit ); |
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951 // Helper function for add_constraint(). |
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952 Node* adjust_limit( int stride_con, Node * scale, Node *offset, Node *rc_limit, Node *loop_limit, Node *pre_ctrl ); |
0 | 953 |
954 // Partially peel loop up through last_peel node. | |
955 bool partial_peel( IdealLoopTree *loop, Node_List &old_new ); | |
956 | |
957 // Create a scheduled list of nodes control dependent on ctrl set. | |
958 void scheduled_nodelist( IdealLoopTree *loop, VectorSet& ctrl, Node_List &sched ); | |
959 // Has a use in the vector set | |
960 bool has_use_in_set( Node* n, VectorSet& vset ); | |
961 // Has use internal to the vector set (ie. not in a phi at the loop head) | |
962 bool has_use_internal_to_set( Node* n, VectorSet& vset, IdealLoopTree *loop ); | |
963 // clone "n" for uses that are outside of loop | |
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964 int clone_for_use_outside_loop( IdealLoopTree *loop, Node* n, Node_List& worklist ); |
0 | 965 // clone "n" for special uses that are in the not_peeled region |
966 void clone_for_special_use_inside_loop( IdealLoopTree *loop, Node* n, | |
967 VectorSet& not_peel, Node_List& sink_list, Node_List& worklist ); | |
968 // Insert phi(lp_entry_val, back_edge_val) at use->in(idx) for loop lp if phi does not already exist | |
969 void insert_phi_for_loop( Node* use, uint idx, Node* lp_entry_val, Node* back_edge_val, LoopNode* lp ); | |
970 #ifdef ASSERT | |
971 // Validate the loop partition sets: peel and not_peel | |
972 bool is_valid_loop_partition( IdealLoopTree *loop, VectorSet& peel, Node_List& peel_list, VectorSet& not_peel ); | |
973 // Ensure that uses outside of loop are of the right form | |
974 bool is_valid_clone_loop_form( IdealLoopTree *loop, Node_List& peel_list, | |
975 uint orig_exit_idx, uint clone_exit_idx); | |
976 bool is_valid_clone_loop_exit_use( IdealLoopTree *loop, Node* use, uint exit_idx); | |
977 #endif | |
978 | |
979 // Returns nonzero constant stride if-node is a possible iv test (otherwise returns zero.) | |
980 int stride_of_possible_iv( Node* iff ); | |
981 bool is_possible_iv_test( Node* iff ) { return stride_of_possible_iv(iff) != 0; } | |
982 // Return the (unique) control output node that's in the loop (if it exists.) | |
983 Node* stay_in_loop( Node* n, IdealLoopTree *loop); | |
984 // Insert a signed compare loop exit cloned from an unsigned compare. | |
985 IfNode* insert_cmpi_loop_exit(IfNode* if_cmpu, IdealLoopTree *loop); | |
986 void remove_cmpi_loop_exit(IfNode* if_cmp, IdealLoopTree *loop); | |
987 // Utility to register node "n" with PhaseIdealLoop | |
988 void register_node(Node* n, IdealLoopTree *loop, Node* pred, int ddepth); | |
989 // Utility to create an if-projection | |
990 ProjNode* proj_clone(ProjNode* p, IfNode* iff); | |
991 // Force the iff control output to be the live_proj | |
992 Node* short_circuit_if(IfNode* iff, ProjNode* live_proj); | |
993 // Insert a region before an if projection | |
994 RegionNode* insert_region_before_proj(ProjNode* proj); | |
995 // Insert a new if before an if projection | |
996 ProjNode* insert_if_before_proj(Node* left, bool Signed, BoolTest::mask relop, Node* right, ProjNode* proj); | |
997 | |
998 // Passed in a Phi merging (recursively) some nearly equivalent Bool/Cmps. | |
999 // "Nearly" because all Nodes have been cloned from the original in the loop, | |
1000 // but the fall-in edges to the Cmp are different. Clone bool/Cmp pairs | |
1001 // through the Phi recursively, and return a Bool. | |
1002 BoolNode *clone_iff( PhiNode *phi, IdealLoopTree *loop ); | |
1003 CmpNode *clone_bool( PhiNode *phi, IdealLoopTree *loop ); | |
1004 | |
1005 | |
1006 // Rework addressing expressions to get the most loop-invariant stuff | |
1007 // moved out. We'd like to do all associative operators, but it's especially | |
1008 // important (common) to do address expressions. | |
1009 Node *remix_address_expressions( Node *n ); | |
1010 | |
1011 // Attempt to use a conditional move instead of a phi/branch | |
1012 Node *conditional_move( Node *n ); | |
1013 | |
1014 // Reorganize offset computations to lower register pressure. | |
1015 // Mostly prevent loop-fallout uses of the pre-incremented trip counter | |
1016 // (which are then alive with the post-incremented trip counter | |
1017 // forcing an extra register move) | |
1018 void reorg_offsets( IdealLoopTree *loop ); | |
1019 | |
1020 // Check for aggressive application of 'split-if' optimization, | |
1021 // using basic block level info. | |
1022 void split_if_with_blocks ( VectorSet &visited, Node_Stack &nstack ); | |
1023 Node *split_if_with_blocks_pre ( Node *n ); | |
1024 void split_if_with_blocks_post( Node *n ); | |
1025 Node *has_local_phi_input( Node *n ); | |
1026 // Mark an IfNode as being dominated by a prior test, | |
1027 // without actually altering the CFG (and hence IDOM info). | |
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1028 void dominated_by( Node *prevdom, Node *iff, bool flip = false, bool exclude_loop_predicate = false ); |
0 | 1029 |
1030 // Split Node 'n' through merge point | |
1031 Node *split_thru_region( Node *n, Node *region ); | |
1032 // Split Node 'n' through merge point if there is enough win. | |
1033 Node *split_thru_phi( Node *n, Node *region, int policy ); | |
1034 // Found an If getting its condition-code input from a Phi in the | |
1035 // same block. Split thru the Region. | |
1036 void do_split_if( Node *iff ); | |
1037 | |
1763 | 1038 // Conversion of fill/copy patterns into intrisic versions |
1039 bool do_intrinsify_fill(); | |
1040 bool intrinsify_fill(IdealLoopTree* lpt); | |
1041 bool match_fill_loop(IdealLoopTree* lpt, Node*& store, Node*& store_value, | |
1042 Node*& shift, Node*& offset); | |
1043 | |
0 | 1044 private: |
1045 // Return a type based on condition control flow | |
1046 const TypeInt* filtered_type( Node *n, Node* n_ctrl); | |
1047 const TypeInt* filtered_type( Node *n ) { return filtered_type(n, NULL); } | |
1048 // Helpers for filtered type | |
1049 const TypeInt* filtered_type_from_dominators( Node* val, Node *val_ctrl); | |
1050 | |
1051 // Helper functions | |
1052 Node *spinup( Node *iff, Node *new_false, Node *new_true, Node *region, Node *phi, small_cache *cache ); | |
1053 Node *find_use_block( Node *use, Node *def, Node *old_false, Node *new_false, Node *old_true, Node *new_true ); | |
1054 void handle_use( Node *use, Node *def, small_cache *cache, Node *region_dom, Node *new_false, Node *new_true, Node *old_false, Node *old_true ); | |
1055 bool split_up( Node *n, Node *blk1, Node *blk2 ); | |
1056 void sink_use( Node *use, Node *post_loop ); | |
1057 Node *place_near_use( Node *useblock ) const; | |
1058 | |
1059 bool _created_loop_node; | |
1060 public: | |
1061 void set_created_loop_node() { _created_loop_node = true; } | |
1062 bool created_loop_node() { return _created_loop_node; } | |
1172 | 1063 void register_new_node( Node *n, Node *blk ); |
0 | 1064 |
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1065 #ifdef ASSERT |
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1066 void dump_bad_graph(const char* msg, Node* n, Node* early, Node* LCA); |
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1067 #endif |
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1068 |
0 | 1069 #ifndef PRODUCT |
1070 void dump( ) const; | |
1071 void dump( IdealLoopTree *loop, uint rpo_idx, Node_List &rpo_list ) const; | |
1072 void rpo( Node *start, Node_Stack &stk, VectorSet &visited, Node_List &rpo_list ) const; | |
1073 void verify() const; // Major slow :-) | |
1074 void verify_compare( Node *n, const PhaseIdealLoop *loop_verify, VectorSet &visited ) const; | |
1075 IdealLoopTree *get_loop_idx(Node* n) const { | |
1076 // Dead nodes have no loop, so return the top level loop instead | |
1077 return _nodes[n->_idx] ? (IdealLoopTree*)_nodes[n->_idx] : _ltree_root; | |
1078 } | |
1079 // Print some stats | |
1080 static void print_statistics(); | |
1081 static int _loop_invokes; // Count of PhaseIdealLoop invokes | |
1082 static int _loop_work; // Sum of PhaseIdealLoop x _unique | |
1083 #endif | |
1084 }; | |
1085 | |
1086 inline Node* IdealLoopTree::tail() { | |
1087 // Handle lazy update of _tail field | |
1088 Node *n = _tail; | |
1089 //while( !n->in(0) ) // Skip dead CFG nodes | |
1090 //n = n->in(1); | |
1091 if (n->in(0) == NULL) | |
1092 n = _phase->get_ctrl(n); | |
1093 _tail = n; | |
1094 return n; | |
1095 } | |
1096 | |
1097 | |
1098 // Iterate over the loop tree using a preorder, left-to-right traversal. | |
1099 // | |
1100 // Example that visits all counted loops from within PhaseIdealLoop | |
1101 // | |
1102 // for (LoopTreeIterator iter(_ltree_root); !iter.done(); iter.next()) { | |
1103 // IdealLoopTree* lpt = iter.current(); | |
1104 // if (!lpt->is_counted()) continue; | |
1105 // ... | |
1106 class LoopTreeIterator : public StackObj { | |
1107 private: | |
1108 IdealLoopTree* _root; | |
1109 IdealLoopTree* _curnt; | |
1110 | |
1111 public: | |
1112 LoopTreeIterator(IdealLoopTree* root) : _root(root), _curnt(root) {} | |
1113 | |
1114 bool done() { return _curnt == NULL; } // Finished iterating? | |
1115 | |
1116 void next(); // Advance to next loop tree | |
1117 | |
1118 IdealLoopTree* current() { return _curnt; } // Return current value of iterator. | |
1119 }; | |
1972 | 1120 |
1121 #endif // SHARE_VM_OPTO_LOOPNODE_HPP |