Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/ifnode.cpp @ 2383:9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
Summary: Add predicates when loop head bytecode is parsed instead of when back branch bytecode is parsed.
Reviewed-by: never
author | kvn |
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date | Mon, 21 Mar 2011 11:28:14 -0700 |
parents | f95d63e2154a |
children | 08eb13460b3a |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
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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 #include "precompiled.hpp" |
26 #include "memory/allocation.inline.hpp" | |
27 #include "opto/addnode.hpp" | |
28 #include "opto/cfgnode.hpp" | |
29 #include "opto/connode.hpp" | |
30 #include "opto/phaseX.hpp" | |
31 #include "opto/runtime.hpp" | |
32 #include "opto/subnode.hpp" | |
33 | |
0 | 34 // Portions of code courtesy of Clifford Click |
35 | |
36 // Optimization - Graph Style | |
37 | |
38 | |
39 extern int explicit_null_checks_elided; | |
40 | |
41 //============================================================================= | |
42 //------------------------------Value------------------------------------------ | |
43 // Return a tuple for whichever arm of the IF is reachable | |
44 const Type *IfNode::Value( PhaseTransform *phase ) const { | |
45 if( !in(0) ) return Type::TOP; | |
46 if( phase->type(in(0)) == Type::TOP ) | |
47 return Type::TOP; | |
48 const Type *t = phase->type(in(1)); | |
49 if( t == Type::TOP ) // data is undefined | |
50 return TypeTuple::IFNEITHER; // unreachable altogether | |
51 if( t == TypeInt::ZERO ) // zero, or false | |
52 return TypeTuple::IFFALSE; // only false branch is reachable | |
53 if( t == TypeInt::ONE ) // 1, or true | |
54 return TypeTuple::IFTRUE; // only true branch is reachable | |
55 assert( t == TypeInt::BOOL, "expected boolean type" ); | |
56 | |
57 return TypeTuple::IFBOTH; // No progress | |
58 } | |
59 | |
60 const RegMask &IfNode::out_RegMask() const { | |
61 return RegMask::Empty; | |
62 } | |
63 | |
64 //------------------------------split_if--------------------------------------- | |
65 // Look for places where we merge constants, then test on the merged value. | |
66 // If the IF test will be constant folded on the path with the constant, we | |
67 // win by splitting the IF to before the merge point. | |
68 static Node* split_if(IfNode *iff, PhaseIterGVN *igvn) { | |
69 // I could be a lot more general here, but I'm trying to squeeze this | |
70 // in before the Christmas '98 break so I'm gonna be kinda restrictive | |
71 // on the patterns I accept. CNC | |
72 | |
73 // Look for a compare of a constant and a merged value | |
74 Node *i1 = iff->in(1); | |
75 if( !i1->is_Bool() ) return NULL; | |
76 BoolNode *b = i1->as_Bool(); | |
77 Node *cmp = b->in(1); | |
78 if( !cmp->is_Cmp() ) return NULL; | |
79 i1 = cmp->in(1); | |
80 if( i1 == NULL || !i1->is_Phi() ) return NULL; | |
81 PhiNode *phi = i1->as_Phi(); | |
82 if( phi->is_copy() ) return NULL; | |
83 Node *con2 = cmp->in(2); | |
84 if( !con2->is_Con() ) return NULL; | |
85 // See that the merge point contains some constants | |
86 Node *con1=NULL; | |
87 uint i4; | |
88 for( i4 = 1; i4 < phi->req(); i4++ ) { | |
89 con1 = phi->in(i4); | |
605 | 90 if( !con1 ) return NULL; // Do not optimize partially collapsed merges |
0 | 91 if( con1->is_Con() ) break; // Found a constant |
92 // Also allow null-vs-not-null checks | |
93 const TypePtr *tp = igvn->type(con1)->isa_ptr(); | |
94 if( tp && tp->_ptr == TypePtr::NotNull ) | |
95 break; | |
96 } | |
97 if( i4 >= phi->req() ) return NULL; // Found no constants | |
98 | |
99 igvn->C->set_has_split_ifs(true); // Has chance for split-if | |
100 | |
101 // Make sure that the compare can be constant folded away | |
102 Node *cmp2 = cmp->clone(); | |
103 cmp2->set_req(1,con1); | |
104 cmp2->set_req(2,con2); | |
105 const Type *t = cmp2->Value(igvn); | |
106 // This compare is dead, so whack it! | |
107 igvn->remove_dead_node(cmp2); | |
108 if( !t->singleton() ) return NULL; | |
109 | |
110 // No intervening control, like a simple Call | |
111 Node *r = iff->in(0); | |
112 if( !r->is_Region() ) return NULL; | |
113 if( phi->region() != r ) return NULL; | |
114 // No other users of the cmp/bool | |
115 if (b->outcnt() != 1 || cmp->outcnt() != 1) { | |
116 //tty->print_cr("many users of cmp/bool"); | |
117 return NULL; | |
118 } | |
119 | |
120 // Make sure we can determine where all the uses of merged values go | |
121 for (DUIterator_Fast jmax, j = r->fast_outs(jmax); j < jmax; j++) { | |
122 Node* u = r->fast_out(j); | |
123 if( u == r ) continue; | |
124 if( u == iff ) continue; | |
125 if( u->outcnt() == 0 ) continue; // use is dead & ignorable | |
126 if( !u->is_Phi() ) { | |
127 /* | |
128 if( u->is_Start() ) { | |
129 tty->print_cr("Region has inlined start use"); | |
130 } else { | |
131 tty->print_cr("Region has odd use"); | |
132 u->dump(2); | |
133 }*/ | |
134 return NULL; | |
135 } | |
136 if( u != phi ) { | |
137 // CNC - do not allow any other merged value | |
138 //tty->print_cr("Merging another value"); | |
139 //u->dump(2); | |
140 return NULL; | |
141 } | |
142 // Make sure we can account for all Phi uses | |
143 for (DUIterator_Fast kmax, k = u->fast_outs(kmax); k < kmax; k++) { | |
144 Node* v = u->fast_out(k); // User of the phi | |
145 // CNC - Allow only really simple patterns. | |
146 // In particular I disallow AddP of the Phi, a fairly common pattern | |
147 if( v == cmp ) continue; // The compare is OK | |
148 if( (v->is_ConstraintCast()) && | |
149 v->in(0)->in(0) == iff ) | |
150 continue; // CastPP/II of the IfNode is OK | |
151 // Disabled following code because I cannot tell if exactly one | |
152 // path dominates without a real dominator check. CNC 9/9/1999 | |
153 //uint vop = v->Opcode(); | |
154 //if( vop == Op_Phi ) { // Phi from another merge point might be OK | |
155 // Node *r = v->in(0); // Get controlling point | |
156 // if( !r ) return NULL; // Degraded to a copy | |
157 // // Find exactly one path in (either True or False doms, but not IFF) | |
158 // int cnt = 0; | |
159 // for( uint i = 1; i < r->req(); i++ ) | |
160 // if( r->in(i) && r->in(i)->in(0) == iff ) | |
161 // cnt++; | |
162 // if( cnt == 1 ) continue; // Exactly one of True or False guards Phi | |
163 //} | |
164 if( !v->is_Call() ) { | |
165 /* | |
166 if( v->Opcode() == Op_AddP ) { | |
167 tty->print_cr("Phi has AddP use"); | |
168 } else if( v->Opcode() == Op_CastPP ) { | |
169 tty->print_cr("Phi has CastPP use"); | |
170 } else if( v->Opcode() == Op_CastII ) { | |
171 tty->print_cr("Phi has CastII use"); | |
172 } else { | |
173 tty->print_cr("Phi has use I cant be bothered with"); | |
174 } | |
175 */ | |
176 } | |
177 return NULL; | |
178 | |
179 /* CNC - Cut out all the fancy acceptance tests | |
180 // Can we clone this use when doing the transformation? | |
181 // If all uses are from Phis at this merge or constants, then YES. | |
182 if( !v->in(0) && v != cmp ) { | |
183 tty->print_cr("Phi has free-floating use"); | |
184 v->dump(2); | |
185 return NULL; | |
186 } | |
187 for( uint l = 1; l < v->req(); l++ ) { | |
188 if( (!v->in(l)->is_Phi() || v->in(l)->in(0) != r) && | |
189 !v->in(l)->is_Con() ) { | |
190 tty->print_cr("Phi has use"); | |
191 v->dump(2); | |
192 return NULL; | |
193 } // End of if Phi-use input is neither Phi nor Constant | |
194 } // End of for all inputs to Phi-use | |
195 */ | |
196 } // End of for all uses of Phi | |
197 } // End of for all uses of Region | |
198 | |
199 // Only do this if the IF node is in a sane state | |
200 if (iff->outcnt() != 2) | |
201 return NULL; | |
202 | |
203 // Got a hit! Do the Mondo Hack! | |
204 // | |
205 //ABC a1c def ghi B 1 e h A C a c d f g i | |
206 // R - Phi - Phi - Phi Rc - Phi - Phi - Phi Rx - Phi - Phi - Phi | |
207 // cmp - 2 cmp - 2 cmp - 2 | |
208 // bool bool_c bool_x | |
209 // if if_c if_x | |
210 // T F T F T F | |
211 // ..s.. ..t .. ..s.. ..t.. ..s.. ..t.. | |
212 // | |
605 | 213 // Split the paths coming into the merge point into 2 separate groups of |
0 | 214 // merges. On the left will be all the paths feeding constants into the |
215 // Cmp's Phi. On the right will be the remaining paths. The Cmp's Phi | |
216 // will fold up into a constant; this will let the Cmp fold up as well as | |
217 // all the control flow. Below the original IF we have 2 control | |
218 // dependent regions, 's' and 't'. Now we will merge the two paths | |
219 // just prior to 's' and 't' from the two IFs. At least 1 path (and quite | |
220 // likely 2 or more) will promptly constant fold away. | |
221 PhaseGVN *phase = igvn; | |
222 | |
223 // Make a region merging constants and a region merging the rest | |
224 uint req_c = 0; | |
225 for (uint ii = 1; ii < r->req(); ii++) { | |
226 if( phi->in(ii) == con1 ) { | |
227 req_c++; | |
228 } | |
229 } | |
230 Node *region_c = new (igvn->C, req_c + 1) RegionNode(req_c + 1); | |
231 Node *phi_c = con1; | |
232 uint len = r->req(); | |
233 Node *region_x = new (igvn->C, len - req_c + 1) RegionNode(len - req_c + 1); | |
234 Node *phi_x = PhiNode::make_blank(region_x, phi); | |
235 for (uint i = 1, i_c = 1, i_x = 1; i < len; i++) { | |
236 if( phi->in(i) == con1 ) { | |
237 region_c->init_req( i_c++, r ->in(i) ); | |
238 } else { | |
239 region_x->init_req( i_x, r ->in(i) ); | |
240 phi_x ->init_req( i_x++, phi->in(i) ); | |
241 } | |
242 } | |
243 | |
244 // Register the new RegionNodes but do not transform them. Cannot | |
605 | 245 // transform until the entire Region/Phi conglomerate has been hacked |
0 | 246 // as a single huge transform. |
247 igvn->register_new_node_with_optimizer( region_c ); | |
248 igvn->register_new_node_with_optimizer( region_x ); | |
249 // Prevent the untimely death of phi_x. Currently he has no uses. He is | |
250 // about to get one. If this only use goes away, then phi_x will look dead. | |
251 // However, he will be picking up some more uses down below. | |
252 Node *hook = new (igvn->C, 4) Node(4); | |
253 hook->init_req(0, phi_x); | |
254 hook->init_req(1, phi_c); | |
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255 phi_x = phase->transform( phi_x ); |
0 | 256 |
257 // Make the compare | |
258 Node *cmp_c = phase->makecon(t); | |
259 Node *cmp_x = cmp->clone(); | |
260 cmp_x->set_req(1,phi_x); | |
261 cmp_x->set_req(2,con2); | |
262 cmp_x = phase->transform(cmp_x); | |
263 // Make the bool | |
264 Node *b_c = phase->transform(new (igvn->C, 2) BoolNode(cmp_c,b->_test._test)); | |
265 Node *b_x = phase->transform(new (igvn->C, 2) BoolNode(cmp_x,b->_test._test)); | |
266 // Make the IfNode | |
267 IfNode *iff_c = new (igvn->C, 2) IfNode(region_c,b_c,iff->_prob,iff->_fcnt); | |
268 igvn->set_type_bottom(iff_c); | |
269 igvn->_worklist.push(iff_c); | |
270 hook->init_req(2, iff_c); | |
271 | |
272 IfNode *iff_x = new (igvn->C, 2) IfNode(region_x,b_x,iff->_prob, iff->_fcnt); | |
273 igvn->set_type_bottom(iff_x); | |
274 igvn->_worklist.push(iff_x); | |
275 hook->init_req(3, iff_x); | |
276 | |
277 // Make the true/false arms | |
278 Node *iff_c_t = phase->transform(new (igvn->C, 1) IfTrueNode (iff_c)); | |
279 Node *iff_c_f = phase->transform(new (igvn->C, 1) IfFalseNode(iff_c)); | |
280 Node *iff_x_t = phase->transform(new (igvn->C, 1) IfTrueNode (iff_x)); | |
281 Node *iff_x_f = phase->transform(new (igvn->C, 1) IfFalseNode(iff_x)); | |
282 | |
283 // Merge the TRUE paths | |
284 Node *region_s = new (igvn->C, 3) RegionNode(3); | |
285 igvn->_worklist.push(region_s); | |
286 region_s->init_req(1, iff_c_t); | |
287 region_s->init_req(2, iff_x_t); | |
288 igvn->register_new_node_with_optimizer( region_s ); | |
289 | |
290 // Merge the FALSE paths | |
291 Node *region_f = new (igvn->C, 3) RegionNode(3); | |
292 igvn->_worklist.push(region_f); | |
293 region_f->init_req(1, iff_c_f); | |
294 region_f->init_req(2, iff_x_f); | |
295 igvn->register_new_node_with_optimizer( region_f ); | |
296 | |
297 igvn->hash_delete(cmp);// Remove soon-to-be-dead node from hash table. | |
298 cmp->set_req(1,NULL); // Whack the inputs to cmp because it will be dead | |
299 cmp->set_req(2,NULL); | |
300 // Check for all uses of the Phi and give them a new home. | |
301 // The 'cmp' got cloned, but CastPP/IIs need to be moved. | |
302 Node *phi_s = NULL; // do not construct unless needed | |
303 Node *phi_f = NULL; // do not construct unless needed | |
304 for (DUIterator_Last i2min, i2 = phi->last_outs(i2min); i2 >= i2min; --i2) { | |
305 Node* v = phi->last_out(i2);// User of the phi | |
306 igvn->hash_delete(v); // Have to fixup other Phi users | |
307 igvn->_worklist.push(v); | |
308 uint vop = v->Opcode(); | |
309 Node *proj = NULL; | |
310 if( vop == Op_Phi ) { // Remote merge point | |
311 Node *r = v->in(0); | |
312 for (uint i3 = 1; i3 < r->req(); i3++) | |
313 if (r->in(i3) && r->in(i3)->in(0) == iff) { | |
314 proj = r->in(i3); | |
315 break; | |
316 } | |
317 } else if( v->is_ConstraintCast() ) { | |
318 proj = v->in(0); // Controlling projection | |
319 } else { | |
320 assert( 0, "do not know how to handle this guy" ); | |
321 } | |
322 | |
323 Node *proj_path_data, *proj_path_ctrl; | |
324 if( proj->Opcode() == Op_IfTrue ) { | |
325 if( phi_s == NULL ) { | |
326 // Only construct phi_s if needed, otherwise provides | |
327 // interfering use. | |
328 phi_s = PhiNode::make_blank(region_s,phi); | |
329 phi_s->init_req( 1, phi_c ); | |
330 phi_s->init_req( 2, phi_x ); | |
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331 hook->add_req(phi_s); |
0 | 332 phi_s = phase->transform(phi_s); |
333 } | |
334 proj_path_data = phi_s; | |
335 proj_path_ctrl = region_s; | |
336 } else { | |
337 if( phi_f == NULL ) { | |
338 // Only construct phi_f if needed, otherwise provides | |
339 // interfering use. | |
340 phi_f = PhiNode::make_blank(region_f,phi); | |
341 phi_f->init_req( 1, phi_c ); | |
342 phi_f->init_req( 2, phi_x ); | |
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343 hook->add_req(phi_f); |
0 | 344 phi_f = phase->transform(phi_f); |
345 } | |
346 proj_path_data = phi_f; | |
347 proj_path_ctrl = region_f; | |
348 } | |
349 | |
350 // Fixup 'v' for for the split | |
351 if( vop == Op_Phi ) { // Remote merge point | |
352 uint i; | |
353 for( i = 1; i < v->req(); i++ ) | |
354 if( v->in(i) == phi ) | |
355 break; | |
356 v->set_req(i, proj_path_data ); | |
357 } else if( v->is_ConstraintCast() ) { | |
358 v->set_req(0, proj_path_ctrl ); | |
359 v->set_req(1, proj_path_data ); | |
360 } else | |
361 ShouldNotReachHere(); | |
362 } | |
363 | |
364 // Now replace the original iff's True/False with region_s/region_t. | |
365 // This makes the original iff go dead. | |
366 for (DUIterator_Last i3min, i3 = iff->last_outs(i3min); i3 >= i3min; --i3) { | |
367 Node* p = iff->last_out(i3); | |
368 assert( p->Opcode() == Op_IfTrue || p->Opcode() == Op_IfFalse, "" ); | |
369 Node *u = (p->Opcode() == Op_IfTrue) ? region_s : region_f; | |
370 // Replace p with u | |
371 igvn->add_users_to_worklist(p); | |
372 for (DUIterator_Last lmin, l = p->last_outs(lmin); l >= lmin;) { | |
373 Node* x = p->last_out(l); | |
374 igvn->hash_delete(x); | |
375 uint uses_found = 0; | |
376 for( uint j = 0; j < x->req(); j++ ) { | |
377 if( x->in(j) == p ) { | |
378 x->set_req(j, u); | |
379 uses_found++; | |
380 } | |
381 } | |
382 l -= uses_found; // we deleted 1 or more copies of this edge | |
383 } | |
384 igvn->remove_dead_node(p); | |
385 } | |
386 | |
387 // Force the original merge dead | |
388 igvn->hash_delete(r); | |
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389 // First, remove region's dead users. |
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390 for (DUIterator_Last lmin, l = r->last_outs(lmin); l >= lmin;) { |
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391 Node* u = r->last_out(l); |
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392 if( u == r ) { |
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393 r->set_req(0, NULL); |
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394 } else { |
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395 assert(u->outcnt() == 0, "only dead users"); |
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396 igvn->remove_dead_node(u); |
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397 } |
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398 l -= 1; |
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399 } |
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400 igvn->remove_dead_node(r); |
0 | 401 |
402 // Now remove the bogus extra edges used to keep things alive | |
403 igvn->remove_dead_node( hook ); | |
404 | |
405 // Must return either the original node (now dead) or a new node | |
406 // (Do not return a top here, since that would break the uniqueness of top.) | |
407 return new (igvn->C, 1) ConINode(TypeInt::ZERO); | |
408 } | |
409 | |
410 //------------------------------is_range_check--------------------------------- | |
411 // Return 0 if not a range check. Return 1 if a range check and set index and | |
412 // offset. Return 2 if we had to negate the test. Index is NULL if the check | |
413 // is versus a constant. | |
414 int IfNode::is_range_check(Node* &range, Node* &index, jint &offset) { | |
415 Node* b = in(1); | |
416 if (b == NULL || !b->is_Bool()) return 0; | |
417 BoolNode* bn = b->as_Bool(); | |
418 Node* cmp = bn->in(1); | |
419 if (cmp == NULL) return 0; | |
420 if (cmp->Opcode() != Op_CmpU) return 0; | |
421 | |
422 Node* l = cmp->in(1); | |
423 Node* r = cmp->in(2); | |
424 int flip_test = 1; | |
425 if (bn->_test._test == BoolTest::le) { | |
426 l = cmp->in(2); | |
427 r = cmp->in(1); | |
428 flip_test = 2; | |
429 } else if (bn->_test._test != BoolTest::lt) { | |
430 return 0; | |
431 } | |
432 if (l->is_top()) return 0; // Top input means dead test | |
433 if (r->Opcode() != Op_LoadRange) return 0; | |
434 | |
435 // We have recognized one of these forms: | |
436 // Flip 1: If (Bool[<] CmpU(l, LoadRange)) ... | |
437 // Flip 2: If (Bool[<=] CmpU(LoadRange, l)) ... | |
438 | |
439 // Make sure it's a real range check by requiring an uncommon trap | |
440 // along the OOB path. Otherwise, it's possible that the user wrote | |
441 // something which optimized to look like a range check but behaves | |
442 // in some other way. | |
443 Node* iftrap = proj_out(flip_test == 2 ? true : false); | |
444 bool found_trap = false; | |
445 if (iftrap != NULL) { | |
446 Node* u = iftrap->unique_ctrl_out(); | |
447 if (u != NULL) { | |
448 // It could be a merge point (Region) for uncommon trap. | |
449 if (u->is_Region()) { | |
450 Node* c = u->unique_ctrl_out(); | |
451 if (c != NULL) { | |
452 iftrap = u; | |
453 u = c; | |
454 } | |
455 } | |
456 if (u->in(0) == iftrap && u->is_CallStaticJava()) { | |
457 int req = u->as_CallStaticJava()->uncommon_trap_request(); | |
458 if (Deoptimization::trap_request_reason(req) == | |
459 Deoptimization::Reason_range_check) { | |
460 found_trap = true; | |
461 } | |
462 } | |
463 } | |
464 } | |
465 if (!found_trap) return 0; // sorry, no cigar | |
466 | |
467 // Look for index+offset form | |
468 Node* ind = l; | |
469 jint off = 0; | |
470 if (l->is_top()) { | |
471 return 0; | |
472 } else if (l->is_Add()) { | |
473 if ((off = l->in(1)->find_int_con(0)) != 0) { | |
474 ind = l->in(2); | |
475 } else if ((off = l->in(2)->find_int_con(0)) != 0) { | |
476 ind = l->in(1); | |
477 } | |
478 } else if ((off = l->find_int_con(-1)) >= 0) { | |
479 // constant offset with no variable index | |
480 ind = NULL; | |
481 } else { | |
482 // variable index with no constant offset (or dead negative index) | |
483 off = 0; | |
484 } | |
485 | |
486 // Return all the values: | |
487 index = ind; | |
488 offset = off; | |
489 range = r; | |
490 return flip_test; | |
491 } | |
492 | |
493 //------------------------------adjust_check----------------------------------- | |
494 // Adjust (widen) a prior range check | |
495 static void adjust_check(Node* proj, Node* range, Node* index, | |
496 int flip, jint off_lo, PhaseIterGVN* igvn) { | |
497 PhaseGVN *gvn = igvn; | |
498 // Break apart the old check | |
499 Node *iff = proj->in(0); | |
500 Node *bol = iff->in(1); | |
501 if( bol->is_top() ) return; // In case a partially dead range check appears | |
502 // bail (or bomb[ASSERT/DEBUG]) if NOT projection-->IfNode-->BoolNode | |
503 DEBUG_ONLY( if( !bol->is_Bool() ) { proj->dump(3); fatal("Expect projection-->IfNode-->BoolNode"); } ) | |
504 if( !bol->is_Bool() ) return; | |
505 | |
506 Node *cmp = bol->in(1); | |
507 // Compute a new check | |
508 Node *new_add = gvn->intcon(off_lo); | |
509 if( index ) { | |
510 new_add = off_lo ? gvn->transform(new (gvn->C, 3) AddINode( index, new_add )) : index; | |
511 } | |
512 Node *new_cmp = (flip == 1) | |
513 ? new (gvn->C, 3) CmpUNode( new_add, range ) | |
514 : new (gvn->C, 3) CmpUNode( range, new_add ); | |
515 new_cmp = gvn->transform(new_cmp); | |
516 // See if no need to adjust the existing check | |
517 if( new_cmp == cmp ) return; | |
518 // Else, adjust existing check | |
519 Node *new_bol = gvn->transform( new (gvn->C, 2) BoolNode( new_cmp, bol->as_Bool()->_test._test ) ); | |
520 igvn->hash_delete( iff ); | |
521 iff->set_req_X( 1, new_bol, igvn ); | |
522 } | |
523 | |
524 //------------------------------up_one_dom------------------------------------- | |
525 // Walk up the dominator tree one step. Return NULL at root or true | |
526 // complex merges. Skips through small diamonds. | |
527 Node* IfNode::up_one_dom(Node *curr, bool linear_only) { | |
528 Node *dom = curr->in(0); | |
529 if( !dom ) // Found a Region degraded to a copy? | |
530 return curr->nonnull_req(); // Skip thru it | |
531 | |
532 if( curr != dom ) // Normal walk up one step? | |
533 return dom; | |
534 | |
535 // Use linear_only if we are still parsing, since we cannot | |
536 // trust the regions to be fully filled in. | |
537 if (linear_only) | |
538 return NULL; | |
539 | |
1153
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540 if( dom->is_Root() ) |
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541 return NULL; |
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542 |
0 | 543 // Else hit a Region. Check for a loop header |
544 if( dom->is_Loop() ) | |
545 return dom->in(1); // Skip up thru loops | |
546 | |
547 // Check for small diamonds | |
548 Node *din1, *din2, *din3, *din4; | |
549 if( dom->req() == 3 && // 2-path merge point | |
550 (din1 = dom ->in(1)) && // Left path exists | |
551 (din2 = dom ->in(2)) && // Right path exists | |
552 (din3 = din1->in(0)) && // Left path up one | |
553 (din4 = din2->in(0)) ) { // Right path up one | |
554 if( din3->is_Call() && // Handle a slow-path call on either arm | |
555 (din3 = din3->in(0)) ) | |
556 din3 = din3->in(0); | |
557 if( din4->is_Call() && // Handle a slow-path call on either arm | |
558 (din4 = din4->in(0)) ) | |
559 din4 = din4->in(0); | |
560 if( din3 == din4 && din3->is_If() ) | |
561 return din3; // Skip around diamonds | |
562 } | |
563 | |
564 // Give up the search at true merges | |
565 return NULL; // Dead loop? Or hit root? | |
566 } | |
567 | |
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568 |
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569 //------------------------------filtered_int_type-------------------------------- |
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570 // Return a possibly more restrictive type for val based on condition control flow for an if |
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571 const TypeInt* IfNode::filtered_int_type(PhaseGVN* gvn, Node *val, Node* if_proj) { |
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572 assert(if_proj && |
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573 (if_proj->Opcode() == Op_IfTrue || if_proj->Opcode() == Op_IfFalse), "expecting an if projection"); |
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574 if (if_proj->in(0) && if_proj->in(0)->is_If()) { |
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575 IfNode* iff = if_proj->in(0)->as_If(); |
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576 if (iff->in(1) && iff->in(1)->is_Bool()) { |
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577 BoolNode* bol = iff->in(1)->as_Bool(); |
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578 if (bol->in(1) && bol->in(1)->is_Cmp()) { |
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579 const CmpNode* cmp = bol->in(1)->as_Cmp(); |
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580 if (cmp->in(1) == val) { |
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581 const TypeInt* cmp2_t = gvn->type(cmp->in(2))->isa_int(); |
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582 if (cmp2_t != NULL) { |
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583 jint lo = cmp2_t->_lo; |
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584 jint hi = cmp2_t->_hi; |
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585 BoolTest::mask msk = if_proj->Opcode() == Op_IfTrue ? bol->_test._test : bol->_test.negate(); |
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586 switch (msk) { |
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587 case BoolTest::ne: |
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588 // Can't refine type |
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589 return NULL; |
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590 case BoolTest::eq: |
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591 return cmp2_t; |
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592 case BoolTest::lt: |
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593 lo = TypeInt::INT->_lo; |
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594 if (hi - 1 < hi) { |
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595 hi = hi - 1; |
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596 } |
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597 break; |
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598 case BoolTest::le: |
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599 lo = TypeInt::INT->_lo; |
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600 break; |
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601 case BoolTest::gt: |
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602 if (lo + 1 > lo) { |
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603 lo = lo + 1; |
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604 } |
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605 hi = TypeInt::INT->_hi; |
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606 break; |
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607 case BoolTest::ge: |
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608 // lo unchanged |
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609 hi = TypeInt::INT->_hi; |
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610 break; |
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611 } |
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612 const TypeInt* rtn_t = TypeInt::make(lo, hi, cmp2_t->_widen); |
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613 return rtn_t; |
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614 } |
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615 } |
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616 } |
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617 } |
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618 } |
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619 return NULL; |
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620 } |
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621 |
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622 //------------------------------fold_compares---------------------------- |
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623 // See if a pair of CmpIs can be converted into a CmpU. In some cases |
605 | 624 // the direction of this if is determined by the preceding if so it |
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625 // can be eliminate entirely. Given an if testing (CmpI n c) check |
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626 // for an immediately control dependent if that is testing (CmpI n c2) |
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627 // and has one projection leading to this if and the other projection |
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628 // leading to a region that merges one of this ifs control |
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629 // projections. |
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630 // |
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631 // If |
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632 // / | |
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633 // / | |
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634 // / | |
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635 // If | |
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636 // /\ | |
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637 // / \ | |
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638 // / \ | |
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639 // / Region |
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640 // |
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641 Node* IfNode::fold_compares(PhaseGVN* phase) { |
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642 if (!EliminateAutoBox || Opcode() != Op_If) return NULL; |
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643 |
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644 Node* this_cmp = in(1)->in(1); |
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645 if (this_cmp != NULL && this_cmp->Opcode() == Op_CmpI && |
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646 this_cmp->in(2)->is_Con() && this_cmp->in(2) != phase->C->top()) { |
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647 Node* ctrl = in(0); |
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648 BoolNode* this_bool = in(1)->as_Bool(); |
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649 Node* n = this_cmp->in(1); |
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650 int hi = this_cmp->in(2)->get_int(); |
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651 if (ctrl != NULL && ctrl->is_Proj() && ctrl->outcnt() == 1 && |
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652 ctrl->in(0)->is_If() && |
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653 ctrl->in(0)->outcnt() == 2 && |
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654 ctrl->in(0)->in(1)->is_Bool() && |
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655 ctrl->in(0)->in(1)->in(1)->Opcode() == Op_CmpI && |
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656 ctrl->in(0)->in(1)->in(1)->in(2)->is_Con() && |
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657 ctrl->in(0)->in(1)->in(1)->in(1) == n) { |
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658 IfNode* dom_iff = ctrl->in(0)->as_If(); |
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659 Node* otherproj = dom_iff->proj_out(!ctrl->as_Proj()->_con); |
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660 if (otherproj->outcnt() == 1 && otherproj->unique_out()->is_Region() && |
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661 this_bool->_test._test != BoolTest::ne && this_bool->_test._test != BoolTest::eq) { |
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662 // Identify which proj goes to the region and which continues on |
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663 RegionNode* region = otherproj->unique_out()->as_Region(); |
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664 Node* success = NULL; |
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665 Node* fail = NULL; |
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666 for (int i = 0; i < 2; i++) { |
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667 Node* proj = proj_out(i); |
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668 if (success == NULL && proj->outcnt() == 1 && proj->unique_out() == region) { |
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669 success = proj; |
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670 } else if (fail == NULL) { |
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671 fail = proj; |
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672 } else { |
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673 success = fail = NULL; |
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674 } |
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675 } |
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676 if (success != NULL && fail != NULL && !region->has_phi()) { |
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677 int lo = dom_iff->in(1)->in(1)->in(2)->get_int(); |
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678 BoolNode* dom_bool = dom_iff->in(1)->as_Bool(); |
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679 Node* dom_cmp = dom_bool->in(1); |
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680 const TypeInt* failtype = filtered_int_type(phase, n, ctrl); |
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681 if (failtype != NULL) { |
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682 const TypeInt* type2 = filtered_int_type(phase, n, fail); |
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683 if (type2 != NULL) { |
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684 failtype = failtype->join(type2)->is_int(); |
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685 } else { |
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686 failtype = NULL; |
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687 } |
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688 } |
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689 |
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690 if (failtype != NULL && |
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691 dom_bool->_test._test != BoolTest::ne && dom_bool->_test._test != BoolTest::eq) { |
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692 int bound = failtype->_hi - failtype->_lo + 1; |
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693 if (failtype->_hi != max_jint && failtype->_lo != min_jint && bound > 1) { |
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694 // Merge the two compares into a single unsigned compare by building (CmpU (n - lo) hi) |
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695 BoolTest::mask cond = fail->as_Proj()->_con ? BoolTest::lt : BoolTest::ge; |
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696 Node* adjusted = phase->transform(new (phase->C, 3) SubINode(n, phase->intcon(failtype->_lo))); |
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697 Node* newcmp = phase->transform(new (phase->C, 3) CmpUNode(adjusted, phase->intcon(bound))); |
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698 Node* newbool = phase->transform(new (phase->C, 2) BoolNode(newcmp, cond)); |
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699 phase->hash_delete(dom_iff); |
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700 dom_iff->set_req(1, phase->intcon(ctrl->as_Proj()->_con)); |
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701 phase->is_IterGVN()->_worklist.push(dom_iff); |
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702 phase->hash_delete(this); |
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703 set_req(1, newbool); |
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704 return this; |
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705 } |
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706 if (failtype->_lo > failtype->_hi) { |
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707 // previous if determines the result of this if so |
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708 // replace Bool with constant |
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709 phase->hash_delete(this); |
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710 set_req(1, phase->intcon(success->as_Proj()->_con)); |
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711 return this; |
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712 } |
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713 } |
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714 } |
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715 } |
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716 } |
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717 } |
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718 return NULL; |
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719 } |
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720 |
0 | 721 //------------------------------remove_useless_bool---------------------------- |
722 // Check for people making a useless boolean: things like | |
723 // if( (x < y ? true : false) ) { ... } | |
724 // Replace with if( x < y ) { ... } | |
725 static Node *remove_useless_bool(IfNode *iff, PhaseGVN *phase) { | |
726 Node *i1 = iff->in(1); | |
727 if( !i1->is_Bool() ) return NULL; | |
728 BoolNode *bol = i1->as_Bool(); | |
729 | |
730 Node *cmp = bol->in(1); | |
731 if( cmp->Opcode() != Op_CmpI ) return NULL; | |
732 | |
733 // Must be comparing against a bool | |
734 const Type *cmp2_t = phase->type( cmp->in(2) ); | |
735 if( cmp2_t != TypeInt::ZERO && | |
736 cmp2_t != TypeInt::ONE ) | |
737 return NULL; | |
738 | |
739 // Find a prior merge point merging the boolean | |
740 i1 = cmp->in(1); | |
741 if( !i1->is_Phi() ) return NULL; | |
742 PhiNode *phi = i1->as_Phi(); | |
743 if( phase->type( phi ) != TypeInt::BOOL ) | |
744 return NULL; | |
745 | |
746 // Check for diamond pattern | |
747 int true_path = phi->is_diamond_phi(); | |
748 if( true_path == 0 ) return NULL; | |
749 | |
250
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750 // Make sure that iff and the control of the phi are different. This |
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751 // should really only happen for dead control flow since it requires |
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752 // an illegal cycle. |
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753 if (phi->in(0)->in(1)->in(0) == iff) return NULL; |
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754 |
0 | 755 // phi->region->if_proj->ifnode->bool->cmp |
756 BoolNode *bol2 = phi->in(0)->in(1)->in(0)->in(1)->as_Bool(); | |
757 | |
758 // Now get the 'sense' of the test correct so we can plug in | |
759 // either iff2->in(1) or its complement. | |
760 int flip = 0; | |
761 if( bol->_test._test == BoolTest::ne ) flip = 1-flip; | |
762 else if( bol->_test._test != BoolTest::eq ) return NULL; | |
763 if( cmp2_t == TypeInt::ZERO ) flip = 1-flip; | |
764 | |
765 const Type *phi1_t = phase->type( phi->in(1) ); | |
766 const Type *phi2_t = phase->type( phi->in(2) ); | |
767 // Check for Phi(0,1) and flip | |
768 if( phi1_t == TypeInt::ZERO ) { | |
769 if( phi2_t != TypeInt::ONE ) return NULL; | |
770 flip = 1-flip; | |
771 } else { | |
772 // Check for Phi(1,0) | |
773 if( phi1_t != TypeInt::ONE ) return NULL; | |
774 if( phi2_t != TypeInt::ZERO ) return NULL; | |
775 } | |
776 if( true_path == 2 ) { | |
777 flip = 1-flip; | |
778 } | |
779 | |
780 Node* new_bol = (flip ? phase->transform( bol2->negate(phase) ) : bol2); | |
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781 assert(new_bol != iff->in(1), "must make progress"); |
0 | 782 iff->set_req(1, new_bol); |
783 // Intervening diamond probably goes dead | |
784 phase->C->set_major_progress(); | |
785 return iff; | |
786 } | |
787 | |
788 static IfNode* idealize_test(PhaseGVN* phase, IfNode* iff); | |
789 | |
790 //------------------------------Ideal------------------------------------------ | |
791 // Return a node which is more "ideal" than the current node. Strip out | |
792 // control copies | |
793 Node *IfNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
794 if (remove_dead_region(phase, can_reshape)) return this; | |
795 // No Def-Use info? | |
796 if (!can_reshape) return NULL; | |
797 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
798 | |
799 // Don't bother trying to transform a dead if | |
800 if (in(0)->is_top()) return NULL; | |
801 // Don't bother trying to transform an if with a dead test | |
802 if (in(1)->is_top()) return NULL; | |
803 // Another variation of a dead test | |
804 if (in(1)->is_Con()) return NULL; | |
805 // Another variation of a dead if | |
806 if (outcnt() < 2) return NULL; | |
807 | |
808 // Canonicalize the test. | |
809 Node* idt_if = idealize_test(phase, this); | |
810 if (idt_if != NULL) return idt_if; | |
811 | |
812 // Try to split the IF | |
813 Node *s = split_if(this, igvn); | |
814 if (s != NULL) return s; | |
815 | |
816 // Check for people making a useless boolean: things like | |
817 // if( (x < y ? true : false) ) { ... } | |
818 // Replace with if( x < y ) { ... } | |
819 Node *bol2 = remove_useless_bool(this, phase); | |
820 if( bol2 ) return bol2; | |
821 | |
822 // Setup to scan up the CFG looking for a dominating test | |
823 Node *dom = in(0); | |
824 Node *prev_dom = this; | |
825 | |
826 // Check for range-check vs other kinds of tests | |
827 Node *index1, *range1; | |
828 jint offset1; | |
829 int flip1 = is_range_check(range1, index1, offset1); | |
830 if( flip1 ) { | |
831 Node *first_prev_dom = NULL; | |
832 | |
833 // Try to remove extra range checks. All 'up_one_dom' gives up at merges | |
834 // so all checks we inspect post-dominate the top-most check we find. | |
835 // If we are going to fail the current check and we reach the top check | |
605 | 836 // then we are guaranteed to fail, so just start interpreting there. |
0 | 837 // We 'expand' the top 2 range checks to include all post-dominating |
838 // checks. | |
839 | |
840 // The top 2 range checks seen | |
841 Node *prev_chk1 = NULL; | |
842 Node *prev_chk2 = NULL; | |
843 // Low and high offsets seen so far | |
844 jint off_lo = offset1; | |
845 jint off_hi = offset1; | |
846 | |
847 // Scan for the top 2 checks and collect range of offsets | |
848 for( int dist = 0; dist < 999; dist++ ) { // Range-Check scan limit | |
849 if( dom->Opcode() == Op_If && // Not same opcode? | |
850 prev_dom->in(0) == dom ) { // One path of test does dominate? | |
851 if( dom == this ) return NULL; // dead loop | |
852 // See if this is a range check | |
853 Node *index2, *range2; | |
854 jint offset2; | |
855 int flip2 = dom->as_If()->is_range_check(range2, index2, offset2); | |
856 // See if this is a _matching_ range check, checking against | |
857 // the same array bounds. | |
858 if( flip2 == flip1 && range2 == range1 && index2 == index1 && | |
859 dom->outcnt() == 2 ) { | |
860 // Gather expanded bounds | |
861 off_lo = MIN2(off_lo,offset2); | |
862 off_hi = MAX2(off_hi,offset2); | |
863 // Record top 2 range checks | |
864 prev_chk2 = prev_chk1; | |
865 prev_chk1 = prev_dom; | |
866 // If we match the test exactly, then the top test covers | |
867 // both our lower and upper bounds. | |
868 if( dom->in(1) == in(1) ) | |
869 prev_chk2 = prev_chk1; | |
870 } | |
871 } | |
872 prev_dom = dom; | |
873 dom = up_one_dom( dom ); | |
874 if( !dom ) break; | |
875 } | |
876 | |
877 | |
878 // Attempt to widen the dominating range check to cover some later | |
879 // ones. Since range checks "fail" by uncommon-trapping to the | |
880 // interpreter, widening a check can make us speculative enter the | |
881 // interpreter. If we see range-check deopt's, do not widen! | |
882 if (!phase->C->allow_range_check_smearing()) return NULL; | |
883 | |
884 // Constant indices only need to check the upper bound. | |
885 // Non-constance indices must check both low and high. | |
886 if( index1 ) { | |
887 // Didn't find 2 prior covering checks, so cannot remove anything. | |
888 if( !prev_chk2 ) return NULL; | |
889 // 'Widen' the offsets of the 1st and 2nd covering check | |
890 adjust_check( prev_chk1, range1, index1, flip1, off_lo, igvn ); | |
891 // Do not call adjust_check twice on the same projection | |
892 // as the first call may have transformed the BoolNode to a ConI | |
893 if( prev_chk1 != prev_chk2 ) { | |
894 adjust_check( prev_chk2, range1, index1, flip1, off_hi, igvn ); | |
895 } | |
896 // Test is now covered by prior checks, dominate it out | |
897 prev_dom = prev_chk2; | |
898 } else { | |
899 // Didn't find prior covering check, so cannot remove anything. | |
900 if( !prev_chk1 ) return NULL; | |
901 // 'Widen' the offset of the 1st and only covering check | |
902 adjust_check( prev_chk1, range1, index1, flip1, off_hi, igvn ); | |
903 // Test is now covered by prior checks, dominate it out | |
904 prev_dom = prev_chk1; | |
905 } | |
906 | |
907 | |
908 } else { // Scan for an equivalent test | |
909 | |
910 Node *cmp; | |
911 int dist = 0; // Cutoff limit for search | |
912 int op = Opcode(); | |
913 if( op == Op_If && | |
914 (cmp=in(1)->in(1))->Opcode() == Op_CmpP ) { | |
915 if( cmp->in(2) != NULL && // make sure cmp is not already dead | |
916 cmp->in(2)->bottom_type() == TypePtr::NULL_PTR ) { | |
917 dist = 64; // Limit for null-pointer scans | |
918 } else { | |
919 dist = 4; // Do not bother for random pointer tests | |
920 } | |
921 } else { | |
922 dist = 4; // Limit for random junky scans | |
923 } | |
924 | |
925 // Normal equivalent-test check. | |
926 if( !dom ) return NULL; // Dead loop? | |
927 | |
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928 Node* result = fold_compares(phase); |
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929 if (result != NULL) { |
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930 return result; |
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931 } |
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932 |
0 | 933 // Search up the dominator tree for an If with an identical test |
934 while( dom->Opcode() != op || // Not same opcode? | |
935 dom->in(1) != in(1) || // Not same input 1? | |
936 (req() == 3 && dom->in(2) != in(2)) || // Not same input 2? | |
937 prev_dom->in(0) != dom ) { // One path of test does not dominate? | |
938 if( dist < 0 ) return NULL; | |
939 | |
940 dist--; | |
941 prev_dom = dom; | |
942 dom = up_one_dom( dom ); | |
943 if( !dom ) return NULL; | |
944 } | |
945 | |
946 // Check that we did not follow a loop back to ourselves | |
947 if( this == dom ) | |
948 return NULL; | |
949 | |
950 if( dist > 2 ) // Add to count of NULL checks elided | |
951 explicit_null_checks_elided++; | |
952 | |
953 } // End of Else scan for an equivalent test | |
954 | |
955 // Hit! Remove this IF | |
956 #ifndef PRODUCT | |
957 if( TraceIterativeGVN ) { | |
958 tty->print(" Removing IfNode: "); this->dump(); | |
959 } | |
960 if( VerifyOpto && !phase->allow_progress() ) { | |
961 // Found an equivalent dominating test, | |
962 // we can not guarantee reaching a fix-point for these during iterativeGVN | |
963 // since intervening nodes may not change. | |
964 return NULL; | |
965 } | |
966 #endif | |
967 | |
968 // Replace dominated IfNode | |
969 dominated_by( prev_dom, igvn ); | |
970 | |
971 // Must return either the original node (now dead) or a new node | |
972 // (Do not return a top here, since that would break the uniqueness of top.) | |
973 return new (phase->C, 1) ConINode(TypeInt::ZERO); | |
974 } | |
975 | |
976 //------------------------------dominated_by----------------------------------- | |
977 void IfNode::dominated_by( Node *prev_dom, PhaseIterGVN *igvn ) { | |
978 igvn->hash_delete(this); // Remove self to prevent spurious V-N | |
979 Node *idom = in(0); | |
980 // Need opcode to decide which way 'this' test goes | |
981 int prev_op = prev_dom->Opcode(); | |
982 Node *top = igvn->C->top(); // Shortcut to top | |
983 | |
984 // Now walk the current IfNode's projections. | |
985 // Loop ends when 'this' has no more uses. | |
986 for (DUIterator_Last imin, i = last_outs(imin); i >= imin; --i) { | |
987 Node *ifp = last_out(i); // Get IfTrue/IfFalse | |
988 igvn->add_users_to_worklist(ifp); | |
989 // Check which projection it is and set target. | |
990 // Data-target is either the dominating projection of the same type | |
991 // or TOP if the dominating projection is of opposite type. | |
992 // Data-target will be used as the new control edge for the non-CFG | |
993 // nodes like Casts and Loads. | |
994 Node *data_target = (ifp->Opcode() == prev_op ) ? prev_dom : top; | |
995 // Control-target is just the If's immediate dominator or TOP. | |
996 Node *ctrl_target = (ifp->Opcode() == prev_op ) ? idom : top; | |
997 | |
998 // For each child of an IfTrue/IfFalse projection, reroute. | |
999 // Loop ends when projection has no more uses. | |
1000 for (DUIterator_Last jmin, j = ifp->last_outs(jmin); j >= jmin; --j) { | |
1001 Node* s = ifp->last_out(j); // Get child of IfTrue/IfFalse | |
1002 igvn->hash_delete(s); // Yank from hash table before edge hacking | |
1003 if( !s->depends_only_on_test() ) { | |
1004 // Find the control input matching this def-use edge. | |
1005 // For Regions it may not be in slot 0. | |
1006 uint l; | |
1007 for( l = 0; s->in(l) != ifp; l++ ) { } | |
1008 s->set_req(l, ctrl_target); | |
1009 } else { // Else, for control producers, | |
1010 s->set_req(0, data_target); // Move child to data-target | |
1011 } | |
1012 igvn->_worklist.push(s); // Revisit collapsed Phis | |
1013 } // End for each child of a projection | |
1014 | |
1015 igvn->remove_dead_node(ifp); | |
1016 } // End for each IfTrue/IfFalse child of If | |
1017 | |
1018 // Kill the IfNode | |
1019 igvn->remove_dead_node(this); | |
1020 } | |
1021 | |
1022 //------------------------------Identity--------------------------------------- | |
1023 // If the test is constant & we match, then we are the input Control | |
1024 Node *IfTrueNode::Identity( PhaseTransform *phase ) { | |
1025 // Can only optimize if cannot go the other way | |
1026 const TypeTuple *t = phase->type(in(0))->is_tuple(); | |
1027 return ( t == TypeTuple::IFNEITHER || t == TypeTuple::IFTRUE ) | |
1028 ? in(0)->in(0) // IfNode control | |
1029 : this; // no progress | |
1030 } | |
1031 | |
1032 //------------------------------dump_spec-------------------------------------- | |
1033 #ifndef PRODUCT | |
1034 void IfNode::dump_spec(outputStream *st) const { | |
1035 st->print("P=%f, C=%f",_prob,_fcnt); | |
1036 } | |
1037 #endif | |
1038 | |
1039 //------------------------------idealize_test---------------------------------- | |
1040 // Try to canonicalize tests better. Peek at the Cmp/Bool/If sequence and | |
1041 // come up with a canonical sequence. Bools getting 'eq', 'gt' and 'ge' forms | |
1042 // converted to 'ne', 'le' and 'lt' forms. IfTrue/IfFalse get swapped as | |
1043 // needed. | |
1044 static IfNode* idealize_test(PhaseGVN* phase, IfNode* iff) { | |
1045 assert(iff->in(0) != NULL, "If must be live"); | |
1046 | |
1047 if (iff->outcnt() != 2) return NULL; // Malformed projections. | |
1048 Node* old_if_f = iff->proj_out(false); | |
1049 Node* old_if_t = iff->proj_out(true); | |
1050 | |
1051 // CountedLoopEnds want the back-control test to be TRUE, irregardless of | |
1052 // whether they are testing a 'gt' or 'lt' condition. The 'gt' condition | |
1053 // happens in count-down loops | |
1054 if (iff->is_CountedLoopEnd()) return NULL; | |
1055 if (!iff->in(1)->is_Bool()) return NULL; // Happens for partially optimized IF tests | |
1056 BoolNode *b = iff->in(1)->as_Bool(); | |
1057 BoolTest bt = b->_test; | |
1058 // Test already in good order? | |
1059 if( bt.is_canonical() ) | |
1060 return NULL; | |
1061 | |
1062 // Flip test to be canonical. Requires flipping the IfFalse/IfTrue and | |
1063 // cloning the IfNode. | |
1064 Node* new_b = phase->transform( new (phase->C, 2) BoolNode(b->in(1), bt.negate()) ); | |
1065 if( !new_b->is_Bool() ) return NULL; | |
1066 b = new_b->as_Bool(); | |
1067 | |
1068 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
1069 assert( igvn, "Test is not canonical in parser?" ); | |
1070 | |
1071 // The IF node never really changes, but it needs to be cloned | |
1072 iff = new (phase->C, 2) IfNode( iff->in(0), b, 1.0-iff->_prob, iff->_fcnt); | |
1073 | |
1074 Node *prior = igvn->hash_find_insert(iff); | |
1075 if( prior ) { | |
1076 igvn->remove_dead_node(iff); | |
1077 iff = (IfNode*)prior; | |
1078 } else { | |
1079 // Cannot call transform on it just yet | |
1080 igvn->set_type_bottom(iff); | |
1081 } | |
1082 igvn->_worklist.push(iff); | |
1083 | |
1084 // Now handle projections. Cloning not required. | |
1085 Node* new_if_f = (Node*)(new (phase->C, 1) IfFalseNode( iff )); | |
1086 Node* new_if_t = (Node*)(new (phase->C, 1) IfTrueNode ( iff )); | |
1087 | |
1088 igvn->register_new_node_with_optimizer(new_if_f); | |
1089 igvn->register_new_node_with_optimizer(new_if_t); | |
1090 // Flip test, so flip trailing control | |
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1091 igvn->replace_node(old_if_f, new_if_t); |
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1092 igvn->replace_node(old_if_t, new_if_f); |
0 | 1093 |
1094 // Progress | |
1095 return iff; | |
1096 } | |
1097 | |
1098 //------------------------------Identity--------------------------------------- | |
1099 // If the test is constant & we match, then we are the input Control | |
1100 Node *IfFalseNode::Identity( PhaseTransform *phase ) { | |
1101 // Can only optimize if cannot go the other way | |
1102 const TypeTuple *t = phase->type(in(0))->is_tuple(); | |
1103 return ( t == TypeTuple::IFNEITHER || t == TypeTuple::IFFALSE ) | |
1104 ? in(0)->in(0) // IfNode control | |
1105 : this; // no progress | |
1106 } |