Mercurial > hg > truffle
annotate src/share/vm/opto/connode.cpp @ 1832:22e4420d19f7
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author | kvn |
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date | Wed, 06 Oct 2010 14:18:32 -0700 |
parents | e9ff18c4ace7 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2009, 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 | |
25 // Optimization - Graph Style | |
26 | |
27 #include "incls/_precompiled.incl" | |
28 #include "incls/_connode.cpp.incl" | |
29 | |
30 //============================================================================= | |
31 //------------------------------hash------------------------------------------- | |
32 uint ConNode::hash() const { | |
33 return (uintptr_t)in(TypeFunc::Control) + _type->hash(); | |
34 } | |
35 | |
36 //------------------------------make------------------------------------------- | |
37 ConNode *ConNode::make( Compile* C, const Type *t ) { | |
38 switch( t->basic_type() ) { | |
39 case T_INT: return new (C, 1) ConINode( t->is_int() ); | |
40 case T_LONG: return new (C, 1) ConLNode( t->is_long() ); | |
41 case T_FLOAT: return new (C, 1) ConFNode( t->is_float_constant() ); | |
42 case T_DOUBLE: return new (C, 1) ConDNode( t->is_double_constant() ); | |
43 case T_VOID: return new (C, 1) ConNode ( Type::TOP ); | |
44 case T_OBJECT: return new (C, 1) ConPNode( t->is_oopptr() ); | |
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45 case T_ARRAY: return new (C, 1) ConPNode( t->is_aryptr() ); |
0 | 46 case T_ADDRESS: return new (C, 1) ConPNode( t->is_ptr() ); |
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47 case T_NARROWOOP: return new (C, 1) ConNNode( t->is_narrowoop() ); |
0 | 48 // Expected cases: TypePtr::NULL_PTR, any is_rawptr() |
49 // Also seen: AnyPtr(TopPTR *+top); from command line: | |
50 // r -XX:+PrintOpto -XX:CIStart=285 -XX:+CompileTheWorld -XX:CompileTheWorldStartAt=660 | |
51 // %%%% Stop using TypePtr::NULL_PTR to represent nulls: use either TypeRawPtr::NULL_PTR | |
52 // or else TypeOopPtr::NULL_PTR. Then set Type::_basic_type[AnyPtr] = T_ILLEGAL | |
53 } | |
54 ShouldNotReachHere(); | |
55 return NULL; | |
56 } | |
57 | |
58 //============================================================================= | |
59 /* | |
60 The major change is for CMoveP and StrComp. They have related but slightly | |
61 different problems. They both take in TWO oops which are both null-checked | |
62 independently before the using Node. After CCP removes the CastPP's they need | |
63 to pick up the guarding test edge - in this case TWO control edges. I tried | |
64 various solutions, all have problems: | |
65 | |
66 (1) Do nothing. This leads to a bug where we hoist a Load from a CMoveP or a | |
67 StrComp above a guarding null check. I've seen both cases in normal -Xcomp | |
68 testing. | |
69 | |
70 (2) Plug the control edge from 1 of the 2 oops in. Apparent problem here is | |
71 to figure out which test post-dominates. The real problem is that it doesn't | |
72 matter which one you pick. After you pick up, the dominating-test elider in | |
73 IGVN can remove the test and allow you to hoist up to the dominating test on | |
605 | 74 the chosen oop bypassing the test on the not-chosen oop. Seen in testing. |
0 | 75 Oops. |
76 | |
77 (3) Leave the CastPP's in. This makes the graph more accurate in some sense; | |
78 we get to keep around the knowledge that an oop is not-null after some test. | |
79 Alas, the CastPP's interfere with GVN (some values are the regular oop, some | |
80 are the CastPP of the oop, all merge at Phi's which cannot collapse, etc). | |
81 This cost us 10% on SpecJVM, even when I removed some of the more trivial | |
82 cases in the optimizer. Removing more useless Phi's started allowing Loads to | |
83 illegally float above null checks. I gave up on this approach. | |
84 | |
85 (4) Add BOTH control edges to both tests. Alas, too much code knows that | |
86 control edges are in slot-zero ONLY. Many quick asserts fail; no way to do | |
87 this one. Note that I really want to allow the CMoveP to float and add both | |
88 control edges to the dependent Load op - meaning I can select early but I | |
89 cannot Load until I pass both tests. | |
90 | |
91 (5) Do not hoist CMoveP and StrComp. To this end I added the v-call | |
92 depends_only_on_test(). No obvious performance loss on Spec, but we are | |
93 clearly conservative on CMoveP (also so on StrComp but that's unlikely to | |
94 matter ever). | |
95 | |
96 */ | |
97 | |
98 | |
99 //------------------------------Ideal------------------------------------------ | |
100 // Return a node which is more "ideal" than the current node. | |
101 // Move constants to the right. | |
102 Node *CMoveNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
103 if( in(0) && remove_dead_region(phase, can_reshape) ) return this; | |
305 | 104 // Don't bother trying to transform a dead node |
105 if( in(0) && in(0)->is_top() ) return NULL; | |
0 | 106 assert( !phase->eqv(in(Condition), this) && |
107 !phase->eqv(in(IfFalse), this) && | |
108 !phase->eqv(in(IfTrue), this), "dead loop in CMoveNode::Ideal" ); | |
109 if( phase->type(in(Condition)) == Type::TOP ) | |
110 return NULL; // return NULL when Condition is dead | |
111 | |
112 if( in(IfFalse)->is_Con() && !in(IfTrue)->is_Con() ) { | |
113 if( in(Condition)->is_Bool() ) { | |
114 BoolNode* b = in(Condition)->as_Bool(); | |
115 BoolNode* b2 = b->negate(phase); | |
116 return make( phase->C, in(Control), phase->transform(b2), in(IfTrue), in(IfFalse), _type ); | |
117 } | |
118 } | |
119 return NULL; | |
120 } | |
121 | |
122 //------------------------------is_cmove_id------------------------------------ | |
123 // Helper function to check for CMOVE identity. Shared with PhiNode::Identity | |
124 Node *CMoveNode::is_cmove_id( PhaseTransform *phase, Node *cmp, Node *t, Node *f, BoolNode *b ) { | |
125 // Check for Cmp'ing and CMove'ing same values | |
126 if( (phase->eqv(cmp->in(1),f) && | |
127 phase->eqv(cmp->in(2),t)) || | |
128 // Swapped Cmp is OK | |
129 (phase->eqv(cmp->in(2),f) && | |
130 phase->eqv(cmp->in(1),t)) ) { | |
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131 // Give up this identity check for floating points because it may choose incorrect |
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132 // value around 0.0 and -0.0 |
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133 if ( cmp->Opcode()==Op_CmpF || cmp->Opcode()==Op_CmpD ) |
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134 return NULL; |
0 | 135 // Check for "(t==f)?t:f;" and replace with "f" |
136 if( b->_test._test == BoolTest::eq ) | |
137 return f; | |
138 // Allow the inverted case as well | |
139 // Check for "(t!=f)?t:f;" and replace with "t" | |
140 if( b->_test._test == BoolTest::ne ) | |
141 return t; | |
142 } | |
143 return NULL; | |
144 } | |
145 | |
146 //------------------------------Identity--------------------------------------- | |
147 // Conditional-move is an identity if both inputs are the same, or the test | |
148 // true or false. | |
149 Node *CMoveNode::Identity( PhaseTransform *phase ) { | |
150 if( phase->eqv(in(IfFalse),in(IfTrue)) ) // C-moving identical inputs? | |
151 return in(IfFalse); // Then it doesn't matter | |
152 if( phase->type(in(Condition)) == TypeInt::ZERO ) | |
153 return in(IfFalse); // Always pick left(false) input | |
154 if( phase->type(in(Condition)) == TypeInt::ONE ) | |
155 return in(IfTrue); // Always pick right(true) input | |
156 | |
157 // Check for CMove'ing a constant after comparing against the constant. | |
158 // Happens all the time now, since if we compare equality vs a constant in | |
159 // the parser, we "know" the variable is constant on one path and we force | |
160 // it. Thus code like "if( x==0 ) {/*EMPTY*/}" ends up inserting a | |
161 // conditional move: "x = (x==0)?0:x;". Yucko. This fix is slightly more | |
162 // general in that we don't need constants. | |
163 if( in(Condition)->is_Bool() ) { | |
164 BoolNode *b = in(Condition)->as_Bool(); | |
165 Node *cmp = b->in(1); | |
166 if( cmp->is_Cmp() ) { | |
167 Node *id = is_cmove_id( phase, cmp, in(IfTrue), in(IfFalse), b ); | |
168 if( id ) return id; | |
169 } | |
170 } | |
171 | |
172 return this; | |
173 } | |
174 | |
175 //------------------------------Value------------------------------------------ | |
176 // Result is the meet of inputs | |
177 const Type *CMoveNode::Value( PhaseTransform *phase ) const { | |
178 if( phase->type(in(Condition)) == Type::TOP ) | |
179 return Type::TOP; | |
180 return phase->type(in(IfFalse))->meet(phase->type(in(IfTrue))); | |
181 } | |
182 | |
183 //------------------------------make------------------------------------------- | |
184 // Make a correctly-flavored CMove. Since _type is directly determined | |
185 // from the inputs we do not need to specify it here. | |
186 CMoveNode *CMoveNode::make( Compile *C, Node *c, Node *bol, Node *left, Node *right, const Type *t ) { | |
187 switch( t->basic_type() ) { | |
188 case T_INT: return new (C, 4) CMoveINode( bol, left, right, t->is_int() ); | |
189 case T_FLOAT: return new (C, 4) CMoveFNode( bol, left, right, t ); | |
190 case T_DOUBLE: return new (C, 4) CMoveDNode( bol, left, right, t ); | |
191 case T_LONG: return new (C, 4) CMoveLNode( bol, left, right, t->is_long() ); | |
192 case T_OBJECT: return new (C, 4) CMovePNode( c, bol, left, right, t->is_oopptr() ); | |
193 case T_ADDRESS: return new (C, 4) CMovePNode( c, bol, left, right, t->is_ptr() ); | |
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194 case T_NARROWOOP: return new (C, 4) CMoveNNode( c, bol, left, right, t ); |
0 | 195 default: |
196 ShouldNotReachHere(); | |
197 return NULL; | |
198 } | |
199 } | |
200 | |
201 //============================================================================= | |
202 //------------------------------Ideal------------------------------------------ | |
203 // Return a node which is more "ideal" than the current node. | |
204 // Check for conversions to boolean | |
205 Node *CMoveINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
206 // Try generic ideal's first | |
207 Node *x = CMoveNode::Ideal(phase, can_reshape); | |
208 if( x ) return x; | |
209 | |
210 // If zero is on the left (false-case, no-move-case) it must mean another | |
211 // constant is on the right (otherwise the shared CMove::Ideal code would | |
212 // have moved the constant to the right). This situation is bad for Intel | |
213 // and a don't-care for Sparc. It's bad for Intel because the zero has to | |
214 // be manifested in a register with a XOR which kills flags, which are live | |
215 // on input to the CMoveI, leading to a situation which causes excessive | |
216 // spilling on Intel. For Sparc, if the zero in on the left the Sparc will | |
217 // zero a register via G0 and conditionally-move the other constant. If the | |
218 // zero is on the right, the Sparc will load the first constant with a | |
219 // 13-bit set-lo and conditionally move G0. See bug 4677505. | |
220 if( phase->type(in(IfFalse)) == TypeInt::ZERO && !(phase->type(in(IfTrue)) == TypeInt::ZERO) ) { | |
221 if( in(Condition)->is_Bool() ) { | |
222 BoolNode* b = in(Condition)->as_Bool(); | |
223 BoolNode* b2 = b->negate(phase); | |
224 return make( phase->C, in(Control), phase->transform(b2), in(IfTrue), in(IfFalse), _type ); | |
225 } | |
226 } | |
227 | |
228 // Now check for booleans | |
229 int flip = 0; | |
230 | |
231 // Check for picking from zero/one | |
232 if( phase->type(in(IfFalse)) == TypeInt::ZERO && phase->type(in(IfTrue)) == TypeInt::ONE ) { | |
233 flip = 1 - flip; | |
234 } else if( phase->type(in(IfFalse)) == TypeInt::ONE && phase->type(in(IfTrue)) == TypeInt::ZERO ) { | |
235 } else return NULL; | |
236 | |
237 // Check for eq/ne test | |
238 if( !in(1)->is_Bool() ) return NULL; | |
239 BoolNode *bol = in(1)->as_Bool(); | |
240 if( bol->_test._test == BoolTest::eq ) { | |
241 } else if( bol->_test._test == BoolTest::ne ) { | |
242 flip = 1-flip; | |
243 } else return NULL; | |
244 | |
245 // Check for vs 0 or 1 | |
246 if( !bol->in(1)->is_Cmp() ) return NULL; | |
247 const CmpNode *cmp = bol->in(1)->as_Cmp(); | |
248 if( phase->type(cmp->in(2)) == TypeInt::ZERO ) { | |
249 } else if( phase->type(cmp->in(2)) == TypeInt::ONE ) { | |
250 // Allow cmp-vs-1 if the other input is bounded by 0-1 | |
251 if( phase->type(cmp->in(1)) != TypeInt::BOOL ) | |
252 return NULL; | |
253 flip = 1 - flip; | |
254 } else return NULL; | |
255 | |
256 // Convert to a bool (flipped) | |
257 // Build int->bool conversion | |
258 #ifndef PRODUCT | |
259 if( PrintOpto ) tty->print_cr("CMOV to I2B"); | |
260 #endif | |
261 Node *n = new (phase->C, 2) Conv2BNode( cmp->in(1) ); | |
262 if( flip ) | |
263 n = new (phase->C, 3) XorINode( phase->transform(n), phase->intcon(1) ); | |
264 | |
265 return n; | |
266 } | |
267 | |
268 //============================================================================= | |
269 //------------------------------Ideal------------------------------------------ | |
270 // Return a node which is more "ideal" than the current node. | |
271 // Check for absolute value | |
272 Node *CMoveFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
273 // Try generic ideal's first | |
274 Node *x = CMoveNode::Ideal(phase, can_reshape); | |
275 if( x ) return x; | |
276 | |
277 int cmp_zero_idx = 0; // Index of compare input where to look for zero | |
278 int phi_x_idx = 0; // Index of phi input where to find naked x | |
279 | |
280 // Find the Bool | |
281 if( !in(1)->is_Bool() ) return NULL; | |
282 BoolNode *bol = in(1)->as_Bool(); | |
283 // Check bool sense | |
284 switch( bol->_test._test ) { | |
285 case BoolTest::lt: cmp_zero_idx = 1; phi_x_idx = IfTrue; break; | |
286 case BoolTest::le: cmp_zero_idx = 2; phi_x_idx = IfFalse; break; | |
287 case BoolTest::gt: cmp_zero_idx = 2; phi_x_idx = IfTrue; break; | |
288 case BoolTest::ge: cmp_zero_idx = 1; phi_x_idx = IfFalse; break; | |
289 default: return NULL; break; | |
290 } | |
291 | |
292 // Find zero input of CmpF; the other input is being abs'd | |
293 Node *cmpf = bol->in(1); | |
294 if( cmpf->Opcode() != Op_CmpF ) return NULL; | |
295 Node *X = NULL; | |
296 bool flip = false; | |
297 if( phase->type(cmpf->in(cmp_zero_idx)) == TypeF::ZERO ) { | |
298 X = cmpf->in(3 - cmp_zero_idx); | |
299 } else if (phase->type(cmpf->in(3 - cmp_zero_idx)) == TypeF::ZERO) { | |
300 // The test is inverted, we should invert the result... | |
301 X = cmpf->in(cmp_zero_idx); | |
302 flip = true; | |
303 } else { | |
304 return NULL; | |
305 } | |
306 | |
307 // If X is found on the appropriate phi input, find the subtract on the other | |
308 if( X != in(phi_x_idx) ) return NULL; | |
309 int phi_sub_idx = phi_x_idx == IfTrue ? IfFalse : IfTrue; | |
310 Node *sub = in(phi_sub_idx); | |
311 | |
312 // Allow only SubF(0,X) and fail out for all others; NegF is not OK | |
313 if( sub->Opcode() != Op_SubF || | |
314 sub->in(2) != X || | |
315 phase->type(sub->in(1)) != TypeF::ZERO ) return NULL; | |
316 | |
317 Node *abs = new (phase->C, 2) AbsFNode( X ); | |
318 if( flip ) | |
319 abs = new (phase->C, 3) SubFNode(sub->in(1), phase->transform(abs)); | |
320 | |
321 return abs; | |
322 } | |
323 | |
324 //============================================================================= | |
325 //------------------------------Ideal------------------------------------------ | |
326 // Return a node which is more "ideal" than the current node. | |
327 // Check for absolute value | |
328 Node *CMoveDNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
329 // Try generic ideal's first | |
330 Node *x = CMoveNode::Ideal(phase, can_reshape); | |
331 if( x ) return x; | |
332 | |
333 int cmp_zero_idx = 0; // Index of compare input where to look for zero | |
334 int phi_x_idx = 0; // Index of phi input where to find naked x | |
335 | |
336 // Find the Bool | |
337 if( !in(1)->is_Bool() ) return NULL; | |
338 BoolNode *bol = in(1)->as_Bool(); | |
339 // Check bool sense | |
340 switch( bol->_test._test ) { | |
341 case BoolTest::lt: cmp_zero_idx = 1; phi_x_idx = IfTrue; break; | |
342 case BoolTest::le: cmp_zero_idx = 2; phi_x_idx = IfFalse; break; | |
343 case BoolTest::gt: cmp_zero_idx = 2; phi_x_idx = IfTrue; break; | |
344 case BoolTest::ge: cmp_zero_idx = 1; phi_x_idx = IfFalse; break; | |
345 default: return NULL; break; | |
346 } | |
347 | |
348 // Find zero input of CmpD; the other input is being abs'd | |
349 Node *cmpd = bol->in(1); | |
350 if( cmpd->Opcode() != Op_CmpD ) return NULL; | |
351 Node *X = NULL; | |
352 bool flip = false; | |
353 if( phase->type(cmpd->in(cmp_zero_idx)) == TypeD::ZERO ) { | |
354 X = cmpd->in(3 - cmp_zero_idx); | |
355 } else if (phase->type(cmpd->in(3 - cmp_zero_idx)) == TypeD::ZERO) { | |
356 // The test is inverted, we should invert the result... | |
357 X = cmpd->in(cmp_zero_idx); | |
358 flip = true; | |
359 } else { | |
360 return NULL; | |
361 } | |
362 | |
363 // If X is found on the appropriate phi input, find the subtract on the other | |
364 if( X != in(phi_x_idx) ) return NULL; | |
365 int phi_sub_idx = phi_x_idx == IfTrue ? IfFalse : IfTrue; | |
366 Node *sub = in(phi_sub_idx); | |
367 | |
368 // Allow only SubD(0,X) and fail out for all others; NegD is not OK | |
369 if( sub->Opcode() != Op_SubD || | |
370 sub->in(2) != X || | |
371 phase->type(sub->in(1)) != TypeD::ZERO ) return NULL; | |
372 | |
373 Node *abs = new (phase->C, 2) AbsDNode( X ); | |
374 if( flip ) | |
375 abs = new (phase->C, 3) SubDNode(sub->in(1), phase->transform(abs)); | |
376 | |
377 return abs; | |
378 } | |
379 | |
380 | |
381 //============================================================================= | |
382 // If input is already higher or equal to cast type, then this is an identity. | |
383 Node *ConstraintCastNode::Identity( PhaseTransform *phase ) { | |
384 return phase->type(in(1))->higher_equal(_type) ? in(1) : this; | |
385 } | |
386 | |
387 //------------------------------Value------------------------------------------ | |
388 // Take 'join' of input and cast-up type | |
389 const Type *ConstraintCastNode::Value( PhaseTransform *phase ) const { | |
390 if( in(0) && phase->type(in(0)) == Type::TOP ) return Type::TOP; | |
391 const Type* ft = phase->type(in(1))->filter(_type); | |
392 | |
393 #ifdef ASSERT | |
394 // Previous versions of this function had some special case logic, | |
395 // which is no longer necessary. Make sure of the required effects. | |
396 switch (Opcode()) { | |
397 case Op_CastII: | |
398 { | |
399 const Type* t1 = phase->type(in(1)); | |
400 if( t1 == Type::TOP ) assert(ft == Type::TOP, "special case #1"); | |
401 const Type* rt = t1->join(_type); | |
402 if (rt->empty()) assert(ft == Type::TOP, "special case #2"); | |
403 break; | |
404 } | |
405 case Op_CastPP: | |
406 if (phase->type(in(1)) == TypePtr::NULL_PTR && | |
407 _type->isa_ptr() && _type->is_ptr()->_ptr == TypePtr::NotNull) | |
408 assert(ft == Type::TOP, "special case #3"); | |
409 break; | |
410 } | |
411 #endif //ASSERT | |
412 | |
413 return ft; | |
414 } | |
415 | |
416 //------------------------------Ideal------------------------------------------ | |
417 // Return a node which is more "ideal" than the current node. Strip out | |
418 // control copies | |
419 Node *ConstraintCastNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
420 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; | |
421 } | |
422 | |
423 //------------------------------Ideal_DU_postCCP------------------------------- | |
424 // Throw away cast after constant propagation | |
425 Node *ConstraintCastNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { | |
426 const Type *t = ccp->type(in(1)); | |
427 ccp->hash_delete(this); | |
428 set_type(t); // Turn into ID function | |
429 ccp->hash_insert(this); | |
430 return this; | |
431 } | |
432 | |
433 | |
434 //============================================================================= | |
435 | |
436 //------------------------------Ideal_DU_postCCP------------------------------- | |
437 // If not converting int->oop, throw away cast after constant propagation | |
438 Node *CastPPNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { | |
439 const Type *t = ccp->type(in(1)); | |
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440 if (!t->isa_oop_ptr() || (in(1)->is_DecodeN() && Matcher::gen_narrow_oop_implicit_null_checks())) { |
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441 return NULL; // do not transform raw pointers or narrow oops |
0 | 442 } |
443 return ConstraintCastNode::Ideal_DU_postCCP(ccp); | |
444 } | |
445 | |
446 | |
447 | |
448 //============================================================================= | |
449 //------------------------------Identity--------------------------------------- | |
450 // If input is already higher or equal to cast type, then this is an identity. | |
451 Node *CheckCastPPNode::Identity( PhaseTransform *phase ) { | |
452 // Toned down to rescue meeting at a Phi 3 different oops all implementing | |
453 // the same interface. CompileTheWorld starting at 502, kd12rc1.zip. | |
454 return (phase->type(in(1)) == phase->type(this)) ? in(1) : this; | |
455 } | |
456 | |
457 // Determine whether "n" is a node which can cause an alias of one of its inputs. Node types | |
458 // which can create aliases are: CheckCastPP, Phi, and any store (if there is also a load from | |
459 // the location.) | |
460 // Note: this checks for aliases created in this compilation, not ones which may | |
461 // be potentially created at call sites. | |
462 static bool can_cause_alias(Node *n, PhaseTransform *phase) { | |
463 bool possible_alias = false; | |
464 | |
465 if (n->is_Store()) { | |
466 possible_alias = !n->as_Store()->value_never_loaded(phase); | |
467 } else { | |
468 int opc = n->Opcode(); | |
469 possible_alias = n->is_Phi() || | |
470 opc == Op_CheckCastPP || | |
471 opc == Op_StorePConditional || | |
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472 opc == Op_CompareAndSwapP || |
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473 opc == Op_CompareAndSwapN; |
0 | 474 } |
475 return possible_alias; | |
476 } | |
477 | |
478 //------------------------------Value------------------------------------------ | |
479 // Take 'join' of input and cast-up type, unless working with an Interface | |
480 const Type *CheckCastPPNode::Value( PhaseTransform *phase ) const { | |
481 if( in(0) && phase->type(in(0)) == Type::TOP ) return Type::TOP; | |
482 | |
483 const Type *inn = phase->type(in(1)); | |
484 if( inn == Type::TOP ) return Type::TOP; // No information yet | |
485 | |
486 const TypePtr *in_type = inn->isa_ptr(); | |
487 const TypePtr *my_type = _type->isa_ptr(); | |
488 const Type *result = _type; | |
489 if( in_type != NULL && my_type != NULL ) { | |
490 TypePtr::PTR in_ptr = in_type->ptr(); | |
491 if( in_ptr == TypePtr::Null ) { | |
492 result = in_type; | |
493 } else if( in_ptr == TypePtr::Constant ) { | |
494 // Casting a constant oop to an interface? | |
495 // (i.e., a String to a Comparable?) | |
496 // Then return the interface. | |
497 const TypeOopPtr *jptr = my_type->isa_oopptr(); | |
498 assert( jptr, "" ); | |
499 result = (jptr->klass()->is_interface() || !in_type->higher_equal(_type)) | |
500 ? my_type->cast_to_ptr_type( TypePtr::NotNull ) | |
501 : in_type; | |
502 } else { | |
503 result = my_type->cast_to_ptr_type( my_type->join_ptr(in_ptr) ); | |
504 } | |
505 } | |
506 return result; | |
507 | |
508 // JOIN NOT DONE HERE BECAUSE OF INTERFACE ISSUES. | |
509 // FIX THIS (DO THE JOIN) WHEN UNION TYPES APPEAR! | |
510 | |
511 // | |
512 // Remove this code after overnight run indicates no performance | |
513 // loss from not performing JOIN at CheckCastPPNode | |
514 // | |
515 // const TypeInstPtr *in_oop = in->isa_instptr(); | |
516 // const TypeInstPtr *my_oop = _type->isa_instptr(); | |
517 // // If either input is an 'interface', return destination type | |
518 // assert (in_oop == NULL || in_oop->klass() != NULL, ""); | |
519 // assert (my_oop == NULL || my_oop->klass() != NULL, ""); | |
520 // if( (in_oop && in_oop->klass()->klass_part()->is_interface()) | |
521 // ||(my_oop && my_oop->klass()->klass_part()->is_interface()) ) { | |
522 // TypePtr::PTR in_ptr = in->isa_ptr() ? in->is_ptr()->_ptr : TypePtr::BotPTR; | |
523 // // Preserve cast away nullness for interfaces | |
524 // if( in_ptr == TypePtr::NotNull && my_oop && my_oop->_ptr == TypePtr::BotPTR ) { | |
525 // return my_oop->cast_to_ptr_type(TypePtr::NotNull); | |
526 // } | |
527 // return _type; | |
528 // } | |
529 // | |
530 // // Neither the input nor the destination type is an interface, | |
531 // | |
532 // // history: JOIN used to cause weird corner case bugs | |
533 // // return (in == TypeOopPtr::NULL_PTR) ? in : _type; | |
534 // // JOIN picks up NotNull in common instance-of/check-cast idioms, both oops. | |
535 // // JOIN does not preserve NotNull in other cases, e.g. RawPtr vs InstPtr | |
536 // const Type *join = in->join(_type); | |
537 // // Check if join preserved NotNull'ness for pointers | |
538 // if( join->isa_ptr() && _type->isa_ptr() ) { | |
539 // TypePtr::PTR join_ptr = join->is_ptr()->_ptr; | |
540 // TypePtr::PTR type_ptr = _type->is_ptr()->_ptr; | |
541 // // If there isn't any NotNull'ness to preserve | |
542 // // OR if join preserved NotNull'ness then return it | |
543 // if( type_ptr == TypePtr::BotPTR || type_ptr == TypePtr::Null || | |
544 // join_ptr == TypePtr::NotNull || join_ptr == TypePtr::Constant ) { | |
545 // return join; | |
546 // } | |
547 // // ELSE return same old type as before | |
548 // return _type; | |
549 // } | |
550 // // Not joining two pointers | |
551 // return join; | |
552 } | |
553 | |
554 //------------------------------Ideal------------------------------------------ | |
555 // Return a node which is more "ideal" than the current node. Strip out | |
556 // control copies | |
557 Node *CheckCastPPNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
558 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; | |
559 } | |
560 | |
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561 |
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562 Node* DecodeNNode::Identity(PhaseTransform* phase) { |
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563 const Type *t = phase->type( in(1) ); |
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564 if( t == Type::TOP ) return in(1); |
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565 |
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566 if (in(1)->is_EncodeP()) { |
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567 // (DecodeN (EncodeP p)) -> p |
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568 return in(1)->in(1); |
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569 } |
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570 return this; |
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571 } |
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572 |
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573 const Type *DecodeNNode::Value( PhaseTransform *phase ) const { |
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574 const Type *t = phase->type( in(1) ); |
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575 if (t == Type::TOP) return Type::TOP; |
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576 if (t == TypeNarrowOop::NULL_PTR) return TypePtr::NULL_PTR; |
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577 |
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578 assert(t->isa_narrowoop(), "only narrowoop here"); |
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579 return t->make_ptr(); |
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580 } |
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581 |
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582 Node* EncodePNode::Identity(PhaseTransform* phase) { |
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583 const Type *t = phase->type( in(1) ); |
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584 if( t == Type::TOP ) return in(1); |
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585 |
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586 if (in(1)->is_DecodeN()) { |
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587 // (EncodeP (DecodeN p)) -> p |
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588 return in(1)->in(1); |
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589 } |
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590 return this; |
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591 } |
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592 |
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593 const Type *EncodePNode::Value( PhaseTransform *phase ) const { |
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594 const Type *t = phase->type( in(1) ); |
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595 if (t == Type::TOP) return Type::TOP; |
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596 if (t == TypePtr::NULL_PTR) return TypeNarrowOop::NULL_PTR; |
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597 |
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598 assert(t->isa_oopptr(), "only oopptr here"); |
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599 return t->make_narrowoop(); |
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600 } |
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601 |
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602 |
163 | 603 Node *EncodePNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { |
604 return MemNode::Ideal_common_DU_postCCP(ccp, this, in(1)); | |
605 } | |
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606 |
0 | 607 //============================================================================= |
608 //------------------------------Identity--------------------------------------- | |
609 Node *Conv2BNode::Identity( PhaseTransform *phase ) { | |
610 const Type *t = phase->type( in(1) ); | |
611 if( t == Type::TOP ) return in(1); | |
612 if( t == TypeInt::ZERO ) return in(1); | |
613 if( t == TypeInt::ONE ) return in(1); | |
614 if( t == TypeInt::BOOL ) return in(1); | |
615 return this; | |
616 } | |
617 | |
618 //------------------------------Value------------------------------------------ | |
619 const Type *Conv2BNode::Value( PhaseTransform *phase ) const { | |
620 const Type *t = phase->type( in(1) ); | |
621 if( t == Type::TOP ) return Type::TOP; | |
622 if( t == TypeInt::ZERO ) return TypeInt::ZERO; | |
623 if( t == TypePtr::NULL_PTR ) return TypeInt::ZERO; | |
624 const TypePtr *tp = t->isa_ptr(); | |
625 if( tp != NULL ) { | |
626 if( tp->ptr() == TypePtr::AnyNull ) return Type::TOP; | |
627 if( tp->ptr() == TypePtr::Constant) return TypeInt::ONE; | |
628 if (tp->ptr() == TypePtr::NotNull) return TypeInt::ONE; | |
629 return TypeInt::BOOL; | |
630 } | |
631 if (t->base() != Type::Int) return TypeInt::BOOL; | |
632 const TypeInt *ti = t->is_int(); | |
633 if( ti->_hi < 0 || ti->_lo > 0 ) return TypeInt::ONE; | |
634 return TypeInt::BOOL; | |
635 } | |
636 | |
637 | |
638 // The conversions operations are all Alpha sorted. Please keep it that way! | |
639 //============================================================================= | |
640 //------------------------------Value------------------------------------------ | |
641 const Type *ConvD2FNode::Value( PhaseTransform *phase ) const { | |
642 const Type *t = phase->type( in(1) ); | |
643 if( t == Type::TOP ) return Type::TOP; | |
644 if( t == Type::DOUBLE ) return Type::FLOAT; | |
645 const TypeD *td = t->is_double_constant(); | |
646 return TypeF::make( (float)td->getd() ); | |
647 } | |
648 | |
649 //------------------------------Identity--------------------------------------- | |
650 // Float's can be converted to doubles with no loss of bits. Hence | |
651 // converting a float to a double and back to a float is a NOP. | |
652 Node *ConvD2FNode::Identity(PhaseTransform *phase) { | |
653 return (in(1)->Opcode() == Op_ConvF2D) ? in(1)->in(1) : this; | |
654 } | |
655 | |
656 //============================================================================= | |
657 //------------------------------Value------------------------------------------ | |
658 const Type *ConvD2INode::Value( PhaseTransform *phase ) const { | |
659 const Type *t = phase->type( in(1) ); | |
660 if( t == Type::TOP ) return Type::TOP; | |
661 if( t == Type::DOUBLE ) return TypeInt::INT; | |
662 const TypeD *td = t->is_double_constant(); | |
663 return TypeInt::make( SharedRuntime::d2i( td->getd() ) ); | |
664 } | |
665 | |
666 //------------------------------Ideal------------------------------------------ | |
667 // If converting to an int type, skip any rounding nodes | |
668 Node *ConvD2INode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
669 if( in(1)->Opcode() == Op_RoundDouble ) | |
670 set_req(1,in(1)->in(1)); | |
671 return NULL; | |
672 } | |
673 | |
674 //------------------------------Identity--------------------------------------- | |
675 // Int's can be converted to doubles with no loss of bits. Hence | |
676 // converting an integer to a double and back to an integer is a NOP. | |
677 Node *ConvD2INode::Identity(PhaseTransform *phase) { | |
678 return (in(1)->Opcode() == Op_ConvI2D) ? in(1)->in(1) : this; | |
679 } | |
680 | |
681 //============================================================================= | |
682 //------------------------------Value------------------------------------------ | |
683 const Type *ConvD2LNode::Value( PhaseTransform *phase ) const { | |
684 const Type *t = phase->type( in(1) ); | |
685 if( t == Type::TOP ) return Type::TOP; | |
686 if( t == Type::DOUBLE ) return TypeLong::LONG; | |
687 const TypeD *td = t->is_double_constant(); | |
688 return TypeLong::make( SharedRuntime::d2l( td->getd() ) ); | |
689 } | |
690 | |
691 //------------------------------Identity--------------------------------------- | |
692 Node *ConvD2LNode::Identity(PhaseTransform *phase) { | |
693 // Remove ConvD2L->ConvL2D->ConvD2L sequences. | |
694 if( in(1) ->Opcode() == Op_ConvL2D && | |
695 in(1)->in(1)->Opcode() == Op_ConvD2L ) | |
696 return in(1)->in(1); | |
697 return this; | |
698 } | |
699 | |
700 //------------------------------Ideal------------------------------------------ | |
701 // If converting to an int type, skip any rounding nodes | |
702 Node *ConvD2LNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
703 if( in(1)->Opcode() == Op_RoundDouble ) | |
704 set_req(1,in(1)->in(1)); | |
705 return NULL; | |
706 } | |
707 | |
708 //============================================================================= | |
709 //------------------------------Value------------------------------------------ | |
710 const Type *ConvF2DNode::Value( PhaseTransform *phase ) const { | |
711 const Type *t = phase->type( in(1) ); | |
712 if( t == Type::TOP ) return Type::TOP; | |
713 if( t == Type::FLOAT ) return Type::DOUBLE; | |
714 const TypeF *tf = t->is_float_constant(); | |
715 #ifndef IA64 | |
716 return TypeD::make( (double)tf->getf() ); | |
717 #else | |
718 float x = tf->getf(); | |
719 return TypeD::make( (x == 0.0f) ? (double)x : (double)x + ia64_double_zero ); | |
720 #endif | |
721 } | |
722 | |
723 //============================================================================= | |
724 //------------------------------Value------------------------------------------ | |
725 const Type *ConvF2INode::Value( PhaseTransform *phase ) const { | |
726 const Type *t = phase->type( in(1) ); | |
727 if( t == Type::TOP ) return Type::TOP; | |
728 if( t == Type::FLOAT ) return TypeInt::INT; | |
729 const TypeF *tf = t->is_float_constant(); | |
730 return TypeInt::make( SharedRuntime::f2i( tf->getf() ) ); | |
731 } | |
732 | |
733 //------------------------------Identity--------------------------------------- | |
734 Node *ConvF2INode::Identity(PhaseTransform *phase) { | |
735 // Remove ConvF2I->ConvI2F->ConvF2I sequences. | |
736 if( in(1) ->Opcode() == Op_ConvI2F && | |
737 in(1)->in(1)->Opcode() == Op_ConvF2I ) | |
738 return in(1)->in(1); | |
739 return this; | |
740 } | |
741 | |
742 //------------------------------Ideal------------------------------------------ | |
743 // If converting to an int type, skip any rounding nodes | |
744 Node *ConvF2INode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
745 if( in(1)->Opcode() == Op_RoundFloat ) | |
746 set_req(1,in(1)->in(1)); | |
747 return NULL; | |
748 } | |
749 | |
750 //============================================================================= | |
751 //------------------------------Value------------------------------------------ | |
752 const Type *ConvF2LNode::Value( PhaseTransform *phase ) const { | |
753 const Type *t = phase->type( in(1) ); | |
754 if( t == Type::TOP ) return Type::TOP; | |
755 if( t == Type::FLOAT ) return TypeLong::LONG; | |
756 const TypeF *tf = t->is_float_constant(); | |
757 return TypeLong::make( SharedRuntime::f2l( tf->getf() ) ); | |
758 } | |
759 | |
760 //------------------------------Identity--------------------------------------- | |
761 Node *ConvF2LNode::Identity(PhaseTransform *phase) { | |
762 // Remove ConvF2L->ConvL2F->ConvF2L sequences. | |
763 if( in(1) ->Opcode() == Op_ConvL2F && | |
764 in(1)->in(1)->Opcode() == Op_ConvF2L ) | |
765 return in(1)->in(1); | |
766 return this; | |
767 } | |
768 | |
769 //------------------------------Ideal------------------------------------------ | |
770 // If converting to an int type, skip any rounding nodes | |
771 Node *ConvF2LNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
772 if( in(1)->Opcode() == Op_RoundFloat ) | |
773 set_req(1,in(1)->in(1)); | |
774 return NULL; | |
775 } | |
776 | |
777 //============================================================================= | |
778 //------------------------------Value------------------------------------------ | |
779 const Type *ConvI2DNode::Value( PhaseTransform *phase ) const { | |
780 const Type *t = phase->type( in(1) ); | |
781 if( t == Type::TOP ) return Type::TOP; | |
782 const TypeInt *ti = t->is_int(); | |
783 if( ti->is_con() ) return TypeD::make( (double)ti->get_con() ); | |
784 return bottom_type(); | |
785 } | |
786 | |
787 //============================================================================= | |
788 //------------------------------Value------------------------------------------ | |
789 const Type *ConvI2FNode::Value( PhaseTransform *phase ) const { | |
790 const Type *t = phase->type( in(1) ); | |
791 if( t == Type::TOP ) return Type::TOP; | |
792 const TypeInt *ti = t->is_int(); | |
793 if( ti->is_con() ) return TypeF::make( (float)ti->get_con() ); | |
794 return bottom_type(); | |
795 } | |
796 | |
797 //------------------------------Identity--------------------------------------- | |
798 Node *ConvI2FNode::Identity(PhaseTransform *phase) { | |
799 // Remove ConvI2F->ConvF2I->ConvI2F sequences. | |
800 if( in(1) ->Opcode() == Op_ConvF2I && | |
801 in(1)->in(1)->Opcode() == Op_ConvI2F ) | |
802 return in(1)->in(1); | |
803 return this; | |
804 } | |
805 | |
806 //============================================================================= | |
807 //------------------------------Value------------------------------------------ | |
808 const Type *ConvI2LNode::Value( PhaseTransform *phase ) const { | |
809 const Type *t = phase->type( in(1) ); | |
810 if( t == Type::TOP ) return Type::TOP; | |
811 const TypeInt *ti = t->is_int(); | |
812 const Type* tl = TypeLong::make(ti->_lo, ti->_hi, ti->_widen); | |
813 // Join my declared type against my incoming type. | |
814 tl = tl->filter(_type); | |
815 return tl; | |
816 } | |
817 | |
818 #ifdef _LP64 | |
819 static inline bool long_ranges_overlap(jlong lo1, jlong hi1, | |
820 jlong lo2, jlong hi2) { | |
821 // Two ranges overlap iff one range's low point falls in the other range. | |
822 return (lo2 <= lo1 && lo1 <= hi2) || (lo1 <= lo2 && lo2 <= hi1); | |
823 } | |
824 #endif | |
825 | |
826 //------------------------------Ideal------------------------------------------ | |
827 Node *ConvI2LNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
828 const TypeLong* this_type = this->type()->is_long(); | |
829 Node* this_changed = NULL; | |
830 | |
831 // If _major_progress, then more loop optimizations follow. Do NOT | |
832 // remove this node's type assertion until no more loop ops can happen. | |
833 // The progress bit is set in the major loop optimizations THEN comes the | |
834 // call to IterGVN and any chance of hitting this code. Cf. Opaque1Node. | |
835 if (can_reshape && !phase->C->major_progress()) { | |
836 const TypeInt* in_type = phase->type(in(1))->isa_int(); | |
837 if (in_type != NULL && this_type != NULL && | |
838 (in_type->_lo != this_type->_lo || | |
839 in_type->_hi != this_type->_hi)) { | |
840 // Although this WORSENS the type, it increases GVN opportunities, | |
841 // because I2L nodes with the same input will common up, regardless | |
842 // of slightly differing type assertions. Such slight differences | |
843 // arise routinely as a result of loop unrolling, so this is a | |
844 // post-unrolling graph cleanup. Choose a type which depends only | |
845 // on my input. (Exception: Keep a range assertion of >=0 or <0.) | |
846 jlong lo1 = this_type->_lo; | |
847 jlong hi1 = this_type->_hi; | |
848 int w1 = this_type->_widen; | |
849 if (lo1 != (jint)lo1 || | |
850 hi1 != (jint)hi1 || | |
851 lo1 > hi1) { | |
852 // Overflow leads to wraparound, wraparound leads to range saturation. | |
853 lo1 = min_jint; hi1 = max_jint; | |
854 } else if (lo1 >= 0) { | |
855 // Keep a range assertion of >=0. | |
856 lo1 = 0; hi1 = max_jint; | |
857 } else if (hi1 < 0) { | |
858 // Keep a range assertion of <0. | |
859 lo1 = min_jint; hi1 = -1; | |
860 } else { | |
861 lo1 = min_jint; hi1 = max_jint; | |
862 } | |
863 const TypeLong* wtype = TypeLong::make(MAX2((jlong)in_type->_lo, lo1), | |
864 MIN2((jlong)in_type->_hi, hi1), | |
865 MAX2((int)in_type->_widen, w1)); | |
866 if (wtype != type()) { | |
867 set_type(wtype); | |
868 // Note: this_type still has old type value, for the logic below. | |
869 this_changed = this; | |
870 } | |
871 } | |
872 } | |
873 | |
874 #ifdef _LP64 | |
875 // Convert ConvI2L(AddI(x, y)) to AddL(ConvI2L(x), ConvI2L(y)) , | |
876 // but only if x and y have subranges that cannot cause 32-bit overflow, | |
877 // under the assumption that x+y is in my own subrange this->type(). | |
878 | |
879 // This assumption is based on a constraint (i.e., type assertion) | |
880 // established in Parse::array_addressing or perhaps elsewhere. | |
881 // This constraint has been adjoined to the "natural" type of | |
882 // the incoming argument in(0). We know (because of runtime | |
883 // checks) - that the result value I2L(x+y) is in the joined range. | |
884 // Hence we can restrict the incoming terms (x, y) to values such | |
885 // that their sum also lands in that range. | |
886 | |
887 // This optimization is useful only on 64-bit systems, where we hope | |
888 // the addition will end up subsumed in an addressing mode. | |
889 // It is necessary to do this when optimizing an unrolled array | |
890 // copy loop such as x[i++] = y[i++]. | |
891 | |
892 // On 32-bit systems, it's better to perform as much 32-bit math as | |
893 // possible before the I2L conversion, because 32-bit math is cheaper. | |
894 // There's no common reason to "leak" a constant offset through the I2L. | |
895 // Addressing arithmetic will not absorb it as part of a 64-bit AddL. | |
896 | |
897 Node* z = in(1); | |
898 int op = z->Opcode(); | |
899 if (op == Op_AddI || op == Op_SubI) { | |
900 Node* x = z->in(1); | |
901 Node* y = z->in(2); | |
902 assert (x != z && y != z, "dead loop in ConvI2LNode::Ideal"); | |
903 if (phase->type(x) == Type::TOP) return this_changed; | |
904 if (phase->type(y) == Type::TOP) return this_changed; | |
905 const TypeInt* tx = phase->type(x)->is_int(); | |
906 const TypeInt* ty = phase->type(y)->is_int(); | |
907 const TypeLong* tz = this_type; | |
908 jlong xlo = tx->_lo; | |
909 jlong xhi = tx->_hi; | |
910 jlong ylo = ty->_lo; | |
911 jlong yhi = ty->_hi; | |
912 jlong zlo = tz->_lo; | |
913 jlong zhi = tz->_hi; | |
914 jlong vbit = CONST64(1) << BitsPerInt; | |
915 int widen = MAX2(tx->_widen, ty->_widen); | |
916 if (op == Op_SubI) { | |
917 jlong ylo0 = ylo; | |
918 ylo = -yhi; | |
919 yhi = -ylo0; | |
920 } | |
921 // See if x+y can cause positive overflow into z+2**32 | |
922 if (long_ranges_overlap(xlo+ylo, xhi+yhi, zlo+vbit, zhi+vbit)) { | |
923 return this_changed; | |
924 } | |
925 // See if x+y can cause negative overflow into z-2**32 | |
926 if (long_ranges_overlap(xlo+ylo, xhi+yhi, zlo-vbit, zhi-vbit)) { | |
927 return this_changed; | |
928 } | |
929 // Now it's always safe to assume x+y does not overflow. | |
930 // This is true even if some pairs x,y might cause overflow, as long | |
931 // as that overflow value cannot fall into [zlo,zhi]. | |
932 | |
933 // Confident that the arithmetic is "as if infinite precision", | |
934 // we can now use z's range to put constraints on those of x and y. | |
935 // The "natural" range of x [xlo,xhi] can perhaps be narrowed to a | |
936 // more "restricted" range by intersecting [xlo,xhi] with the | |
937 // range obtained by subtracting y's range from the asserted range | |
938 // of the I2L conversion. Here's the interval arithmetic algebra: | |
939 // x == z-y == [zlo,zhi]-[ylo,yhi] == [zlo,zhi]+[-yhi,-ylo] | |
940 // => x in [zlo-yhi, zhi-ylo] | |
941 // => x in [zlo-yhi, zhi-ylo] INTERSECT [xlo,xhi] | |
942 // => x in [xlo MAX zlo-yhi, xhi MIN zhi-ylo] | |
943 jlong rxlo = MAX2(xlo, zlo - yhi); | |
944 jlong rxhi = MIN2(xhi, zhi - ylo); | |
945 // And similarly, x changing place with y: | |
946 jlong rylo = MAX2(ylo, zlo - xhi); | |
947 jlong ryhi = MIN2(yhi, zhi - xlo); | |
948 if (rxlo > rxhi || rylo > ryhi) { | |
949 return this_changed; // x or y is dying; don't mess w/ it | |
950 } | |
951 if (op == Op_SubI) { | |
952 jlong rylo0 = rylo; | |
953 rylo = -ryhi; | |
954 ryhi = -rylo0; | |
955 } | |
956 | |
957 Node* cx = phase->transform( new (phase->C, 2) ConvI2LNode(x, TypeLong::make(rxlo, rxhi, widen)) ); | |
958 Node* cy = phase->transform( new (phase->C, 2) ConvI2LNode(y, TypeLong::make(rylo, ryhi, widen)) ); | |
959 switch (op) { | |
960 case Op_AddI: return new (phase->C, 3) AddLNode(cx, cy); | |
961 case Op_SubI: return new (phase->C, 3) SubLNode(cx, cy); | |
962 default: ShouldNotReachHere(); | |
963 } | |
964 } | |
965 #endif //_LP64 | |
966 | |
967 return this_changed; | |
968 } | |
969 | |
970 //============================================================================= | |
971 //------------------------------Value------------------------------------------ | |
972 const Type *ConvL2DNode::Value( PhaseTransform *phase ) const { | |
973 const Type *t = phase->type( in(1) ); | |
974 if( t == Type::TOP ) return Type::TOP; | |
975 const TypeLong *tl = t->is_long(); | |
976 if( tl->is_con() ) return TypeD::make( (double)tl->get_con() ); | |
977 return bottom_type(); | |
978 } | |
979 | |
980 //============================================================================= | |
981 //------------------------------Value------------------------------------------ | |
982 const Type *ConvL2FNode::Value( PhaseTransform *phase ) const { | |
983 const Type *t = phase->type( in(1) ); | |
984 if( t == Type::TOP ) return Type::TOP; | |
985 const TypeLong *tl = t->is_long(); | |
986 if( tl->is_con() ) return TypeF::make( (float)tl->get_con() ); | |
987 return bottom_type(); | |
988 } | |
989 | |
990 //============================================================================= | |
991 //----------------------------Identity----------------------------------------- | |
992 Node *ConvL2INode::Identity( PhaseTransform *phase ) { | |
993 // Convert L2I(I2L(x)) => x | |
994 if (in(1)->Opcode() == Op_ConvI2L) return in(1)->in(1); | |
995 return this; | |
996 } | |
997 | |
998 //------------------------------Value------------------------------------------ | |
999 const Type *ConvL2INode::Value( PhaseTransform *phase ) const { | |
1000 const Type *t = phase->type( in(1) ); | |
1001 if( t == Type::TOP ) return Type::TOP; | |
1002 const TypeLong *tl = t->is_long(); | |
1003 if (tl->is_con()) | |
1004 // Easy case. | |
1005 return TypeInt::make((jint)tl->get_con()); | |
1006 return bottom_type(); | |
1007 } | |
1008 | |
1009 //------------------------------Ideal------------------------------------------ | |
1010 // Return a node which is more "ideal" than the current node. | |
1011 // Blow off prior masking to int | |
1012 Node *ConvL2INode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1013 Node *andl = in(1); | |
1014 uint andl_op = andl->Opcode(); | |
1015 if( andl_op == Op_AndL ) { | |
1016 // Blow off prior masking to int | |
1017 if( phase->type(andl->in(2)) == TypeLong::make( 0xFFFFFFFF ) ) { | |
1018 set_req(1,andl->in(1)); | |
1019 return this; | |
1020 } | |
1021 } | |
1022 | |
1023 // Swap with a prior add: convL2I(addL(x,y)) ==> addI(convL2I(x),convL2I(y)) | |
1024 // This replaces an 'AddL' with an 'AddI'. | |
1025 if( andl_op == Op_AddL ) { | |
1026 // Don't do this for nodes which have more than one user since | |
1027 // we'll end up computing the long add anyway. | |
1028 if (andl->outcnt() > 1) return NULL; | |
1029 | |
1030 Node* x = andl->in(1); | |
1031 Node* y = andl->in(2); | |
1032 assert( x != andl && y != andl, "dead loop in ConvL2INode::Ideal" ); | |
1033 if (phase->type(x) == Type::TOP) return NULL; | |
1034 if (phase->type(y) == Type::TOP) return NULL; | |
1035 Node *add1 = phase->transform(new (phase->C, 2) ConvL2INode(x)); | |
1036 Node *add2 = phase->transform(new (phase->C, 2) ConvL2INode(y)); | |
1037 return new (phase->C, 3) AddINode(add1,add2); | |
1038 } | |
1039 | |
36 | 1040 // Disable optimization: LoadL->ConvL2I ==> LoadI. |
1041 // It causes problems (sizes of Load and Store nodes do not match) | |
1042 // in objects initialization code and Escape Analysis. | |
0 | 1043 return NULL; |
1044 } | |
1045 | |
1046 //============================================================================= | |
1047 //------------------------------Value------------------------------------------ | |
1048 const Type *CastX2PNode::Value( PhaseTransform *phase ) const { | |
1049 const Type* t = phase->type(in(1)); | |
1050 if (t->base() == Type_X && t->singleton()) { | |
1051 uintptr_t bits = (uintptr_t) t->is_intptr_t()->get_con(); | |
1052 if (bits == 0) return TypePtr::NULL_PTR; | |
1053 return TypeRawPtr::make((address) bits); | |
1054 } | |
1055 return CastX2PNode::bottom_type(); | |
1056 } | |
1057 | |
1058 //------------------------------Idealize--------------------------------------- | |
1059 static inline bool fits_in_int(const Type* t, bool but_not_min_int = false) { | |
1060 if (t == Type::TOP) return false; | |
1061 const TypeX* tl = t->is_intptr_t(); | |
1062 jint lo = min_jint; | |
1063 jint hi = max_jint; | |
1064 if (but_not_min_int) ++lo; // caller wants to negate the value w/o overflow | |
1065 return (tl->_lo >= lo) && (tl->_hi <= hi); | |
1066 } | |
1067 | |
1068 static inline Node* addP_of_X2P(PhaseGVN *phase, | |
1069 Node* base, | |
1070 Node* dispX, | |
1071 bool negate = false) { | |
1072 if (negate) { | |
1073 dispX = new (phase->C, 3) SubXNode(phase->MakeConX(0), phase->transform(dispX)); | |
1074 } | |
1075 return new (phase->C, 4) AddPNode(phase->C->top(), | |
1076 phase->transform(new (phase->C, 2) CastX2PNode(base)), | |
1077 phase->transform(dispX)); | |
1078 } | |
1079 | |
1080 Node *CastX2PNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1081 // convert CastX2P(AddX(x, y)) to AddP(CastX2P(x), y) if y fits in an int | |
1082 int op = in(1)->Opcode(); | |
1083 Node* x; | |
1084 Node* y; | |
1085 switch (op) { | |
1086 case Op_SubX: | |
1087 x = in(1)->in(1); | |
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1088 // Avoid ideal transformations ping-pong between this and AddP for raw pointers. |
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1089 if (phase->find_intptr_t_con(x, -1) == 0) |
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1090 break; |
0 | 1091 y = in(1)->in(2); |
1092 if (fits_in_int(phase->type(y), true)) { | |
1093 return addP_of_X2P(phase, x, y, true); | |
1094 } | |
1095 break; | |
1096 case Op_AddX: | |
1097 x = in(1)->in(1); | |
1098 y = in(1)->in(2); | |
1099 if (fits_in_int(phase->type(y))) { | |
1100 return addP_of_X2P(phase, x, y); | |
1101 } | |
1102 if (fits_in_int(phase->type(x))) { | |
1103 return addP_of_X2P(phase, y, x); | |
1104 } | |
1105 break; | |
1106 } | |
1107 return NULL; | |
1108 } | |
1109 | |
1110 //------------------------------Identity--------------------------------------- | |
1111 Node *CastX2PNode::Identity( PhaseTransform *phase ) { | |
1112 if (in(1)->Opcode() == Op_CastP2X) return in(1)->in(1); | |
1113 return this; | |
1114 } | |
1115 | |
1116 //============================================================================= | |
1117 //------------------------------Value------------------------------------------ | |
1118 const Type *CastP2XNode::Value( PhaseTransform *phase ) const { | |
1119 const Type* t = phase->type(in(1)); | |
1120 if (t->base() == Type::RawPtr && t->singleton()) { | |
1121 uintptr_t bits = (uintptr_t) t->is_rawptr()->get_con(); | |
1122 return TypeX::make(bits); | |
1123 } | |
1124 return CastP2XNode::bottom_type(); | |
1125 } | |
1126 | |
1127 Node *CastP2XNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1128 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; | |
1129 } | |
1130 | |
1131 //------------------------------Identity--------------------------------------- | |
1132 Node *CastP2XNode::Identity( PhaseTransform *phase ) { | |
1133 if (in(1)->Opcode() == Op_CastX2P) return in(1)->in(1); | |
1134 return this; | |
1135 } | |
1136 | |
1137 | |
1138 //============================================================================= | |
1139 //------------------------------Identity--------------------------------------- | |
1140 // Remove redundant roundings | |
1141 Node *RoundFloatNode::Identity( PhaseTransform *phase ) { | |
1142 assert(Matcher::strict_fp_requires_explicit_rounding, "should only generate for Intel"); | |
1143 // Do not round constants | |
1144 if (phase->type(in(1))->base() == Type::FloatCon) return in(1); | |
1145 int op = in(1)->Opcode(); | |
1146 // Redundant rounding | |
1147 if( op == Op_RoundFloat ) return in(1); | |
1148 // Already rounded | |
1149 if( op == Op_Parm ) return in(1); | |
1150 if( op == Op_LoadF ) return in(1); | |
1151 return this; | |
1152 } | |
1153 | |
1154 //------------------------------Value------------------------------------------ | |
1155 const Type *RoundFloatNode::Value( PhaseTransform *phase ) const { | |
1156 return phase->type( in(1) ); | |
1157 } | |
1158 | |
1159 //============================================================================= | |
1160 //------------------------------Identity--------------------------------------- | |
1161 // Remove redundant roundings. Incoming arguments are already rounded. | |
1162 Node *RoundDoubleNode::Identity( PhaseTransform *phase ) { | |
1163 assert(Matcher::strict_fp_requires_explicit_rounding, "should only generate for Intel"); | |
1164 // Do not round constants | |
1165 if (phase->type(in(1))->base() == Type::DoubleCon) return in(1); | |
1166 int op = in(1)->Opcode(); | |
1167 // Redundant rounding | |
1168 if( op == Op_RoundDouble ) return in(1); | |
1169 // Already rounded | |
1170 if( op == Op_Parm ) return in(1); | |
1171 if( op == Op_LoadD ) return in(1); | |
1172 if( op == Op_ConvF2D ) return in(1); | |
1173 if( op == Op_ConvI2D ) return in(1); | |
1174 return this; | |
1175 } | |
1176 | |
1177 //------------------------------Value------------------------------------------ | |
1178 const Type *RoundDoubleNode::Value( PhaseTransform *phase ) const { | |
1179 return phase->type( in(1) ); | |
1180 } | |
1181 | |
1182 | |
1183 //============================================================================= | |
1184 // Do not allow value-numbering | |
1185 uint Opaque1Node::hash() const { return NO_HASH; } | |
1186 uint Opaque1Node::cmp( const Node &n ) const { | |
1187 return (&n == this); // Always fail except on self | |
1188 } | |
1189 | |
1190 //------------------------------Identity--------------------------------------- | |
1191 // If _major_progress, then more loop optimizations follow. Do NOT remove | |
1192 // the opaque Node until no more loop ops can happen. Note the timing of | |
1193 // _major_progress; it's set in the major loop optimizations THEN comes the | |
1194 // call to IterGVN and any chance of hitting this code. Hence there's no | |
1195 // phase-ordering problem with stripping Opaque1 in IGVN followed by some | |
1196 // more loop optimizations that require it. | |
1197 Node *Opaque1Node::Identity( PhaseTransform *phase ) { | |
1198 return phase->C->major_progress() ? this : in(1); | |
1199 } | |
1200 | |
1201 //============================================================================= | |
1202 // A node to prevent unwanted optimizations. Allows constant folding. Stops | |
1203 // value-numbering, most Ideal calls or Identity functions. This Node is | |
1204 // specifically designed to prevent the pre-increment value of a loop trip | |
1205 // counter from being live out of the bottom of the loop (hence causing the | |
1206 // pre- and post-increment values both being live and thus requiring an extra | |
1207 // temp register and an extra move). If we "accidentally" optimize through | |
1208 // this kind of a Node, we'll get slightly pessimal, but correct, code. Thus | |
1209 // it's OK to be slightly sloppy on optimizations here. | |
1210 | |
1211 // Do not allow value-numbering | |
1212 uint Opaque2Node::hash() const { return NO_HASH; } | |
1213 uint Opaque2Node::cmp( const Node &n ) const { | |
1214 return (&n == this); // Always fail except on self | |
1215 } | |
1216 | |
1217 | |
1218 //------------------------------Value------------------------------------------ | |
1219 const Type *MoveL2DNode::Value( PhaseTransform *phase ) const { | |
1220 const Type *t = phase->type( in(1) ); | |
1221 if( t == Type::TOP ) return Type::TOP; | |
1222 const TypeLong *tl = t->is_long(); | |
1223 if( !tl->is_con() ) return bottom_type(); | |
1224 JavaValue v; | |
1225 v.set_jlong(tl->get_con()); | |
1226 return TypeD::make( v.get_jdouble() ); | |
1227 } | |
1228 | |
1229 //------------------------------Value------------------------------------------ | |
1230 const Type *MoveI2FNode::Value( PhaseTransform *phase ) const { | |
1231 const Type *t = phase->type( in(1) ); | |
1232 if( t == Type::TOP ) return Type::TOP; | |
1233 const TypeInt *ti = t->is_int(); | |
1234 if( !ti->is_con() ) return bottom_type(); | |
1235 JavaValue v; | |
1236 v.set_jint(ti->get_con()); | |
1237 return TypeF::make( v.get_jfloat() ); | |
1238 } | |
1239 | |
1240 //------------------------------Value------------------------------------------ | |
1241 const Type *MoveF2INode::Value( PhaseTransform *phase ) const { | |
1242 const Type *t = phase->type( in(1) ); | |
1243 if( t == Type::TOP ) return Type::TOP; | |
1244 if( t == Type::FLOAT ) return TypeInt::INT; | |
1245 const TypeF *tf = t->is_float_constant(); | |
1246 JavaValue v; | |
1247 v.set_jfloat(tf->getf()); | |
1248 return TypeInt::make( v.get_jint() ); | |
1249 } | |
1250 | |
1251 //------------------------------Value------------------------------------------ | |
1252 const Type *MoveD2LNode::Value( PhaseTransform *phase ) const { | |
1253 const Type *t = phase->type( in(1) ); | |
1254 if( t == Type::TOP ) return Type::TOP; | |
1255 if( t == Type::DOUBLE ) return TypeLong::LONG; | |
1256 const TypeD *td = t->is_double_constant(); | |
1257 JavaValue v; | |
1258 v.set_jdouble(td->getd()); | |
1259 return TypeLong::make( v.get_jlong() ); | |
1260 } | |
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1261 |
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1262 //------------------------------Value------------------------------------------ |
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1263 const Type* CountLeadingZerosINode::Value(PhaseTransform* phase) const { |
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1264 const Type* t = phase->type(in(1)); |
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1265 if (t == Type::TOP) return Type::TOP; |
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1266 const TypeInt* ti = t->isa_int(); |
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1267 if (ti && ti->is_con()) { |
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1268 jint i = ti->get_con(); |
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1269 // HD, Figure 5-6 |
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1270 if (i == 0) |
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1271 return TypeInt::make(BitsPerInt); |
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1272 int n = 1; |
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1273 unsigned int x = i; |
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1274 if (x >> 16 == 0) { n += 16; x <<= 16; } |
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1275 if (x >> 24 == 0) { n += 8; x <<= 8; } |
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1276 if (x >> 28 == 0) { n += 4; x <<= 4; } |
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1277 if (x >> 30 == 0) { n += 2; x <<= 2; } |
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1278 n -= x >> 31; |
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1279 return TypeInt::make(n); |
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1280 } |
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1281 return TypeInt::INT; |
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1282 } |
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1283 |
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1284 //------------------------------Value------------------------------------------ |
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1285 const Type* CountLeadingZerosLNode::Value(PhaseTransform* phase) const { |
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1286 const Type* t = phase->type(in(1)); |
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1287 if (t == Type::TOP) return Type::TOP; |
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1288 const TypeLong* tl = t->isa_long(); |
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1289 if (tl && tl->is_con()) { |
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1290 jlong l = tl->get_con(); |
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1291 // HD, Figure 5-6 |
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1292 if (l == 0) |
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1293 return TypeInt::make(BitsPerLong); |
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1294 int n = 1; |
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1295 unsigned int x = (((julong) l) >> 32); |
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1296 if (x == 0) { n += 32; x = (int) l; } |
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1297 if (x >> 16 == 0) { n += 16; x <<= 16; } |
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1298 if (x >> 24 == 0) { n += 8; x <<= 8; } |
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1299 if (x >> 28 == 0) { n += 4; x <<= 4; } |
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1300 if (x >> 30 == 0) { n += 2; x <<= 2; } |
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1301 n -= x >> 31; |
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1302 return TypeInt::make(n); |
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1303 } |
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1304 return TypeInt::INT; |
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1305 } |
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1306 |
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1307 //------------------------------Value------------------------------------------ |
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1308 const Type* CountTrailingZerosINode::Value(PhaseTransform* phase) const { |
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1309 const Type* t = phase->type(in(1)); |
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1310 if (t == Type::TOP) return Type::TOP; |
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1311 const TypeInt* ti = t->isa_int(); |
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1312 if (ti && ti->is_con()) { |
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1313 jint i = ti->get_con(); |
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1314 // HD, Figure 5-14 |
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1315 int y; |
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1316 if (i == 0) |
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1317 return TypeInt::make(BitsPerInt); |
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1318 int n = 31; |
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1319 y = i << 16; if (y != 0) { n = n - 16; i = y; } |
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1320 y = i << 8; if (y != 0) { n = n - 8; i = y; } |
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1321 y = i << 4; if (y != 0) { n = n - 4; i = y; } |
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1322 y = i << 2; if (y != 0) { n = n - 2; i = y; } |
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1323 y = i << 1; if (y != 0) { n = n - 1; } |
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1324 return TypeInt::make(n); |
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1325 } |
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1326 return TypeInt::INT; |
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1327 } |
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1328 |
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1329 //------------------------------Value------------------------------------------ |
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1330 const Type* CountTrailingZerosLNode::Value(PhaseTransform* phase) const { |
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1331 const Type* t = phase->type(in(1)); |
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1332 if (t == Type::TOP) return Type::TOP; |
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1333 const TypeLong* tl = t->isa_long(); |
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1334 if (tl && tl->is_con()) { |
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1335 jlong l = tl->get_con(); |
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1336 // HD, Figure 5-14 |
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1337 int x, y; |
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1338 if (l == 0) |
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1339 return TypeInt::make(BitsPerLong); |
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1340 int n = 63; |
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1341 y = (int) l; if (y != 0) { n = n - 32; x = y; } else x = (((julong) l) >> 32); |
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1342 y = x << 16; if (y != 0) { n = n - 16; x = y; } |
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1343 y = x << 8; if (y != 0) { n = n - 8; x = y; } |
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1344 y = x << 4; if (y != 0) { n = n - 4; x = y; } |
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1345 y = x << 2; if (y != 0) { n = n - 2; x = y; } |
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1346 y = x << 1; if (y != 0) { n = n - 1; } |
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1347 return TypeInt::make(n); |
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1348 } |
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1349 return TypeInt::INT; |
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1350 } |