Mercurial > hg > truffle
annotate src/share/vm/opto/connode.cpp @ 14714:b602356a9cfc
additional canonicalizers for accesses and value nodes (improves number of implicit null checks)
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Thu, 20 Mar 2014 17:15:36 +0100 |
parents | 5ec7dace41a6 |
children | 4ca6dc0799b6 5b8e0f84f00f |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "memory/allocation.inline.hpp" | |
27 #include "opto/addnode.hpp" | |
28 #include "opto/compile.hpp" | |
29 #include "opto/connode.hpp" | |
30 #include "opto/machnode.hpp" | |
31 #include "opto/matcher.hpp" | |
32 #include "opto/memnode.hpp" | |
33 #include "opto/phaseX.hpp" | |
34 #include "opto/subnode.hpp" | |
35 #include "runtime/sharedRuntime.hpp" | |
0 | 36 |
1972 | 37 // Optimization - Graph Style |
0 | 38 |
39 //============================================================================= | |
40 //------------------------------hash------------------------------------------- | |
41 uint ConNode::hash() const { | |
42 return (uintptr_t)in(TypeFunc::Control) + _type->hash(); | |
43 } | |
44 | |
45 //------------------------------make------------------------------------------- | |
46 ConNode *ConNode::make( Compile* C, const Type *t ) { | |
47 switch( t->basic_type() ) { | |
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48 case T_INT: return new (C) ConINode( t->is_int() ); |
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49 case T_LONG: return new (C) ConLNode( t->is_long() ); |
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50 case T_FLOAT: return new (C) ConFNode( t->is_float_constant() ); |
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51 case T_DOUBLE: return new (C) ConDNode( t->is_double_constant() ); |
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52 case T_VOID: return new (C) ConNode ( Type::TOP ); |
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53 case T_OBJECT: return new (C) ConPNode( t->is_ptr() ); |
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54 case T_ARRAY: return new (C) ConPNode( t->is_aryptr() ); |
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55 case T_ADDRESS: return new (C) ConPNode( t->is_ptr() ); |
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56 case T_NARROWOOP: return new (C) ConNNode( t->is_narrowoop() ); |
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57 case T_NARROWKLASS: return new (C) ConNKlassNode( t->is_narrowklass() ); |
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58 case T_METADATA: return new (C) ConPNode( t->is_ptr() ); |
0 | 59 // Expected cases: TypePtr::NULL_PTR, any is_rawptr() |
60 // Also seen: AnyPtr(TopPTR *+top); from command line: | |
61 // r -XX:+PrintOpto -XX:CIStart=285 -XX:+CompileTheWorld -XX:CompileTheWorldStartAt=660 | |
62 // %%%% Stop using TypePtr::NULL_PTR to represent nulls: use either TypeRawPtr::NULL_PTR | |
63 // or else TypeOopPtr::NULL_PTR. Then set Type::_basic_type[AnyPtr] = T_ILLEGAL | |
64 } | |
65 ShouldNotReachHere(); | |
66 return NULL; | |
67 } | |
68 | |
69 //============================================================================= | |
70 /* | |
71 The major change is for CMoveP and StrComp. They have related but slightly | |
72 different problems. They both take in TWO oops which are both null-checked | |
73 independently before the using Node. After CCP removes the CastPP's they need | |
74 to pick up the guarding test edge - in this case TWO control edges. I tried | |
75 various solutions, all have problems: | |
76 | |
77 (1) Do nothing. This leads to a bug where we hoist a Load from a CMoveP or a | |
78 StrComp above a guarding null check. I've seen both cases in normal -Xcomp | |
79 testing. | |
80 | |
81 (2) Plug the control edge from 1 of the 2 oops in. Apparent problem here is | |
82 to figure out which test post-dominates. The real problem is that it doesn't | |
83 matter which one you pick. After you pick up, the dominating-test elider in | |
84 IGVN can remove the test and allow you to hoist up to the dominating test on | |
605 | 85 the chosen oop bypassing the test on the not-chosen oop. Seen in testing. |
0 | 86 Oops. |
87 | |
88 (3) Leave the CastPP's in. This makes the graph more accurate in some sense; | |
89 we get to keep around the knowledge that an oop is not-null after some test. | |
90 Alas, the CastPP's interfere with GVN (some values are the regular oop, some | |
91 are the CastPP of the oop, all merge at Phi's which cannot collapse, etc). | |
92 This cost us 10% on SpecJVM, even when I removed some of the more trivial | |
93 cases in the optimizer. Removing more useless Phi's started allowing Loads to | |
94 illegally float above null checks. I gave up on this approach. | |
95 | |
96 (4) Add BOTH control edges to both tests. Alas, too much code knows that | |
97 control edges are in slot-zero ONLY. Many quick asserts fail; no way to do | |
98 this one. Note that I really want to allow the CMoveP to float and add both | |
99 control edges to the dependent Load op - meaning I can select early but I | |
100 cannot Load until I pass both tests. | |
101 | |
102 (5) Do not hoist CMoveP and StrComp. To this end I added the v-call | |
103 depends_only_on_test(). No obvious performance loss on Spec, but we are | |
104 clearly conservative on CMoveP (also so on StrComp but that's unlikely to | |
105 matter ever). | |
106 | |
107 */ | |
108 | |
109 | |
110 //------------------------------Ideal------------------------------------------ | |
111 // Return a node which is more "ideal" than the current node. | |
112 // Move constants to the right. | |
113 Node *CMoveNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
114 if( in(0) && remove_dead_region(phase, can_reshape) ) return this; | |
305 | 115 // Don't bother trying to transform a dead node |
116 if( in(0) && in(0)->is_top() ) return NULL; | |
0 | 117 assert( !phase->eqv(in(Condition), this) && |
118 !phase->eqv(in(IfFalse), this) && | |
119 !phase->eqv(in(IfTrue), this), "dead loop in CMoveNode::Ideal" ); | |
120 if( phase->type(in(Condition)) == Type::TOP ) | |
121 return NULL; // return NULL when Condition is dead | |
122 | |
123 if( in(IfFalse)->is_Con() && !in(IfTrue)->is_Con() ) { | |
124 if( in(Condition)->is_Bool() ) { | |
125 BoolNode* b = in(Condition)->as_Bool(); | |
126 BoolNode* b2 = b->negate(phase); | |
127 return make( phase->C, in(Control), phase->transform(b2), in(IfTrue), in(IfFalse), _type ); | |
128 } | |
129 } | |
130 return NULL; | |
131 } | |
132 | |
133 //------------------------------is_cmove_id------------------------------------ | |
134 // Helper function to check for CMOVE identity. Shared with PhiNode::Identity | |
135 Node *CMoveNode::is_cmove_id( PhaseTransform *phase, Node *cmp, Node *t, Node *f, BoolNode *b ) { | |
136 // Check for Cmp'ing and CMove'ing same values | |
137 if( (phase->eqv(cmp->in(1),f) && | |
138 phase->eqv(cmp->in(2),t)) || | |
139 // Swapped Cmp is OK | |
140 (phase->eqv(cmp->in(2),f) && | |
141 phase->eqv(cmp->in(1),t)) ) { | |
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142 // Give up this identity check for floating points because it may choose incorrect |
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143 // value around 0.0 and -0.0 |
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144 if ( cmp->Opcode()==Op_CmpF || cmp->Opcode()==Op_CmpD ) |
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145 return NULL; |
0 | 146 // Check for "(t==f)?t:f;" and replace with "f" |
147 if( b->_test._test == BoolTest::eq ) | |
148 return f; | |
149 // Allow the inverted case as well | |
150 // Check for "(t!=f)?t:f;" and replace with "t" | |
151 if( b->_test._test == BoolTest::ne ) | |
152 return t; | |
153 } | |
154 return NULL; | |
155 } | |
156 | |
157 //------------------------------Identity--------------------------------------- | |
158 // Conditional-move is an identity if both inputs are the same, or the test | |
159 // true or false. | |
160 Node *CMoveNode::Identity( PhaseTransform *phase ) { | |
161 if( phase->eqv(in(IfFalse),in(IfTrue)) ) // C-moving identical inputs? | |
162 return in(IfFalse); // Then it doesn't matter | |
163 if( phase->type(in(Condition)) == TypeInt::ZERO ) | |
164 return in(IfFalse); // Always pick left(false) input | |
165 if( phase->type(in(Condition)) == TypeInt::ONE ) | |
166 return in(IfTrue); // Always pick right(true) input | |
167 | |
168 // Check for CMove'ing a constant after comparing against the constant. | |
169 // Happens all the time now, since if we compare equality vs a constant in | |
170 // the parser, we "know" the variable is constant on one path and we force | |
171 // it. Thus code like "if( x==0 ) {/*EMPTY*/}" ends up inserting a | |
172 // conditional move: "x = (x==0)?0:x;". Yucko. This fix is slightly more | |
173 // general in that we don't need constants. | |
174 if( in(Condition)->is_Bool() ) { | |
175 BoolNode *b = in(Condition)->as_Bool(); | |
176 Node *cmp = b->in(1); | |
177 if( cmp->is_Cmp() ) { | |
178 Node *id = is_cmove_id( phase, cmp, in(IfTrue), in(IfFalse), b ); | |
179 if( id ) return id; | |
180 } | |
181 } | |
182 | |
183 return this; | |
184 } | |
185 | |
186 //------------------------------Value------------------------------------------ | |
187 // Result is the meet of inputs | |
188 const Type *CMoveNode::Value( PhaseTransform *phase ) const { | |
189 if( phase->type(in(Condition)) == Type::TOP ) | |
190 return Type::TOP; | |
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191 return phase->type(in(IfFalse))->meet_speculative(phase->type(in(IfTrue))); |
0 | 192 } |
193 | |
194 //------------------------------make------------------------------------------- | |
195 // Make a correctly-flavored CMove. Since _type is directly determined | |
196 // from the inputs we do not need to specify it here. | |
197 CMoveNode *CMoveNode::make( Compile *C, Node *c, Node *bol, Node *left, Node *right, const Type *t ) { | |
198 switch( t->basic_type() ) { | |
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199 case T_INT: return new (C) CMoveINode( bol, left, right, t->is_int() ); |
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200 case T_FLOAT: return new (C) CMoveFNode( bol, left, right, t ); |
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201 case T_DOUBLE: return new (C) CMoveDNode( bol, left, right, t ); |
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202 case T_LONG: return new (C) CMoveLNode( bol, left, right, t->is_long() ); |
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203 case T_OBJECT: return new (C) CMovePNode( c, bol, left, right, t->is_oopptr() ); |
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204 case T_ADDRESS: return new (C) CMovePNode( c, bol, left, right, t->is_ptr() ); |
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205 case T_NARROWOOP: return new (C) CMoveNNode( c, bol, left, right, t ); |
0 | 206 default: |
207 ShouldNotReachHere(); | |
208 return NULL; | |
209 } | |
210 } | |
211 | |
212 //============================================================================= | |
213 //------------------------------Ideal------------------------------------------ | |
214 // Return a node which is more "ideal" than the current node. | |
215 // Check for conversions to boolean | |
216 Node *CMoveINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
217 // Try generic ideal's first | |
218 Node *x = CMoveNode::Ideal(phase, can_reshape); | |
219 if( x ) return x; | |
220 | |
221 // If zero is on the left (false-case, no-move-case) it must mean another | |
222 // constant is on the right (otherwise the shared CMove::Ideal code would | |
223 // have moved the constant to the right). This situation is bad for Intel | |
224 // and a don't-care for Sparc. It's bad for Intel because the zero has to | |
225 // be manifested in a register with a XOR which kills flags, which are live | |
226 // on input to the CMoveI, leading to a situation which causes excessive | |
227 // spilling on Intel. For Sparc, if the zero in on the left the Sparc will | |
228 // zero a register via G0 and conditionally-move the other constant. If the | |
229 // zero is on the right, the Sparc will load the first constant with a | |
230 // 13-bit set-lo and conditionally move G0. See bug 4677505. | |
231 if( phase->type(in(IfFalse)) == TypeInt::ZERO && !(phase->type(in(IfTrue)) == TypeInt::ZERO) ) { | |
232 if( in(Condition)->is_Bool() ) { | |
233 BoolNode* b = in(Condition)->as_Bool(); | |
234 BoolNode* b2 = b->negate(phase); | |
235 return make( phase->C, in(Control), phase->transform(b2), in(IfTrue), in(IfFalse), _type ); | |
236 } | |
237 } | |
238 | |
239 // Now check for booleans | |
240 int flip = 0; | |
241 | |
242 // Check for picking from zero/one | |
243 if( phase->type(in(IfFalse)) == TypeInt::ZERO && phase->type(in(IfTrue)) == TypeInt::ONE ) { | |
244 flip = 1 - flip; | |
245 } else if( phase->type(in(IfFalse)) == TypeInt::ONE && phase->type(in(IfTrue)) == TypeInt::ZERO ) { | |
246 } else return NULL; | |
247 | |
248 // Check for eq/ne test | |
249 if( !in(1)->is_Bool() ) return NULL; | |
250 BoolNode *bol = in(1)->as_Bool(); | |
251 if( bol->_test._test == BoolTest::eq ) { | |
252 } else if( bol->_test._test == BoolTest::ne ) { | |
253 flip = 1-flip; | |
254 } else return NULL; | |
255 | |
256 // Check for vs 0 or 1 | |
257 if( !bol->in(1)->is_Cmp() ) return NULL; | |
258 const CmpNode *cmp = bol->in(1)->as_Cmp(); | |
259 if( phase->type(cmp->in(2)) == TypeInt::ZERO ) { | |
260 } else if( phase->type(cmp->in(2)) == TypeInt::ONE ) { | |
261 // Allow cmp-vs-1 if the other input is bounded by 0-1 | |
262 if( phase->type(cmp->in(1)) != TypeInt::BOOL ) | |
263 return NULL; | |
264 flip = 1 - flip; | |
265 } else return NULL; | |
266 | |
267 // Convert to a bool (flipped) | |
268 // Build int->bool conversion | |
269 #ifndef PRODUCT | |
270 if( PrintOpto ) tty->print_cr("CMOV to I2B"); | |
271 #endif | |
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272 Node *n = new (phase->C) Conv2BNode( cmp->in(1) ); |
0 | 273 if( flip ) |
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274 n = new (phase->C) XorINode( phase->transform(n), phase->intcon(1) ); |
0 | 275 |
276 return n; | |
277 } | |
278 | |
279 //============================================================================= | |
280 //------------------------------Ideal------------------------------------------ | |
281 // Return a node which is more "ideal" than the current node. | |
282 // Check for absolute value | |
283 Node *CMoveFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
284 // Try generic ideal's first | |
285 Node *x = CMoveNode::Ideal(phase, can_reshape); | |
286 if( x ) return x; | |
287 | |
288 int cmp_zero_idx = 0; // Index of compare input where to look for zero | |
289 int phi_x_idx = 0; // Index of phi input where to find naked x | |
290 | |
291 // Find the Bool | |
292 if( !in(1)->is_Bool() ) return NULL; | |
293 BoolNode *bol = in(1)->as_Bool(); | |
294 // Check bool sense | |
295 switch( bol->_test._test ) { | |
296 case BoolTest::lt: cmp_zero_idx = 1; phi_x_idx = IfTrue; break; | |
297 case BoolTest::le: cmp_zero_idx = 2; phi_x_idx = IfFalse; break; | |
298 case BoolTest::gt: cmp_zero_idx = 2; phi_x_idx = IfTrue; break; | |
299 case BoolTest::ge: cmp_zero_idx = 1; phi_x_idx = IfFalse; break; | |
300 default: return NULL; break; | |
301 } | |
302 | |
303 // Find zero input of CmpF; the other input is being abs'd | |
304 Node *cmpf = bol->in(1); | |
305 if( cmpf->Opcode() != Op_CmpF ) return NULL; | |
306 Node *X = NULL; | |
307 bool flip = false; | |
308 if( phase->type(cmpf->in(cmp_zero_idx)) == TypeF::ZERO ) { | |
309 X = cmpf->in(3 - cmp_zero_idx); | |
310 } else if (phase->type(cmpf->in(3 - cmp_zero_idx)) == TypeF::ZERO) { | |
311 // The test is inverted, we should invert the result... | |
312 X = cmpf->in(cmp_zero_idx); | |
313 flip = true; | |
314 } else { | |
315 return NULL; | |
316 } | |
317 | |
318 // If X is found on the appropriate phi input, find the subtract on the other | |
319 if( X != in(phi_x_idx) ) return NULL; | |
320 int phi_sub_idx = phi_x_idx == IfTrue ? IfFalse : IfTrue; | |
321 Node *sub = in(phi_sub_idx); | |
322 | |
323 // Allow only SubF(0,X) and fail out for all others; NegF is not OK | |
324 if( sub->Opcode() != Op_SubF || | |
325 sub->in(2) != X || | |
326 phase->type(sub->in(1)) != TypeF::ZERO ) return NULL; | |
327 | |
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328 Node *abs = new (phase->C) AbsFNode( X ); |
0 | 329 if( flip ) |
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330 abs = new (phase->C) SubFNode(sub->in(1), phase->transform(abs)); |
0 | 331 |
332 return abs; | |
333 } | |
334 | |
335 //============================================================================= | |
336 //------------------------------Ideal------------------------------------------ | |
337 // Return a node which is more "ideal" than the current node. | |
338 // Check for absolute value | |
339 Node *CMoveDNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
340 // Try generic ideal's first | |
341 Node *x = CMoveNode::Ideal(phase, can_reshape); | |
342 if( x ) return x; | |
343 | |
344 int cmp_zero_idx = 0; // Index of compare input where to look for zero | |
345 int phi_x_idx = 0; // Index of phi input where to find naked x | |
346 | |
347 // Find the Bool | |
348 if( !in(1)->is_Bool() ) return NULL; | |
349 BoolNode *bol = in(1)->as_Bool(); | |
350 // Check bool sense | |
351 switch( bol->_test._test ) { | |
352 case BoolTest::lt: cmp_zero_idx = 1; phi_x_idx = IfTrue; break; | |
353 case BoolTest::le: cmp_zero_idx = 2; phi_x_idx = IfFalse; break; | |
354 case BoolTest::gt: cmp_zero_idx = 2; phi_x_idx = IfTrue; break; | |
355 case BoolTest::ge: cmp_zero_idx = 1; phi_x_idx = IfFalse; break; | |
356 default: return NULL; break; | |
357 } | |
358 | |
359 // Find zero input of CmpD; the other input is being abs'd | |
360 Node *cmpd = bol->in(1); | |
361 if( cmpd->Opcode() != Op_CmpD ) return NULL; | |
362 Node *X = NULL; | |
363 bool flip = false; | |
364 if( phase->type(cmpd->in(cmp_zero_idx)) == TypeD::ZERO ) { | |
365 X = cmpd->in(3 - cmp_zero_idx); | |
366 } else if (phase->type(cmpd->in(3 - cmp_zero_idx)) == TypeD::ZERO) { | |
367 // The test is inverted, we should invert the result... | |
368 X = cmpd->in(cmp_zero_idx); | |
369 flip = true; | |
370 } else { | |
371 return NULL; | |
372 } | |
373 | |
374 // If X is found on the appropriate phi input, find the subtract on the other | |
375 if( X != in(phi_x_idx) ) return NULL; | |
376 int phi_sub_idx = phi_x_idx == IfTrue ? IfFalse : IfTrue; | |
377 Node *sub = in(phi_sub_idx); | |
378 | |
379 // Allow only SubD(0,X) and fail out for all others; NegD is not OK | |
380 if( sub->Opcode() != Op_SubD || | |
381 sub->in(2) != X || | |
382 phase->type(sub->in(1)) != TypeD::ZERO ) return NULL; | |
383 | |
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384 Node *abs = new (phase->C) AbsDNode( X ); |
0 | 385 if( flip ) |
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386 abs = new (phase->C) SubDNode(sub->in(1), phase->transform(abs)); |
0 | 387 |
388 return abs; | |
389 } | |
390 | |
391 | |
392 //============================================================================= | |
393 // If input is already higher or equal to cast type, then this is an identity. | |
394 Node *ConstraintCastNode::Identity( PhaseTransform *phase ) { | |
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395 return phase->type(in(1))->higher_equal_speculative(_type) ? in(1) : this; |
0 | 396 } |
397 | |
398 //------------------------------Value------------------------------------------ | |
399 // Take 'join' of input and cast-up type | |
400 const Type *ConstraintCastNode::Value( PhaseTransform *phase ) const { | |
401 if( in(0) && phase->type(in(0)) == Type::TOP ) return Type::TOP; | |
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402 const Type* ft = phase->type(in(1))->filter_speculative(_type); |
0 | 403 |
404 #ifdef ASSERT | |
405 // Previous versions of this function had some special case logic, | |
406 // which is no longer necessary. Make sure of the required effects. | |
407 switch (Opcode()) { | |
408 case Op_CastII: | |
409 { | |
410 const Type* t1 = phase->type(in(1)); | |
411 if( t1 == Type::TOP ) assert(ft == Type::TOP, "special case #1"); | |
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412 const Type* rt = t1->join_speculative(_type); |
0 | 413 if (rt->empty()) assert(ft == Type::TOP, "special case #2"); |
414 break; | |
415 } | |
416 case Op_CastPP: | |
417 if (phase->type(in(1)) == TypePtr::NULL_PTR && | |
418 _type->isa_ptr() && _type->is_ptr()->_ptr == TypePtr::NotNull) | |
419 assert(ft == Type::TOP, "special case #3"); | |
420 break; | |
421 } | |
422 #endif //ASSERT | |
423 | |
424 return ft; | |
425 } | |
426 | |
427 //------------------------------Ideal------------------------------------------ | |
428 // Return a node which is more "ideal" than the current node. Strip out | |
429 // control copies | |
430 Node *ConstraintCastNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
431 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; | |
432 } | |
433 | |
434 //------------------------------Ideal_DU_postCCP------------------------------- | |
435 // Throw away cast after constant propagation | |
436 Node *ConstraintCastNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { | |
437 const Type *t = ccp->type(in(1)); | |
438 ccp->hash_delete(this); | |
439 set_type(t); // Turn into ID function | |
440 ccp->hash_insert(this); | |
441 return this; | |
442 } | |
443 | |
444 | |
445 //============================================================================= | |
446 | |
447 //------------------------------Ideal_DU_postCCP------------------------------- | |
448 // If not converting int->oop, throw away cast after constant propagation | |
449 Node *CastPPNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { | |
450 const Type *t = ccp->type(in(1)); | |
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451 if (!t->isa_oop_ptr() || ((in(1)->is_DecodeN()) && Matcher::gen_narrow_oop_implicit_null_checks())) { |
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452 return NULL; // do not transform raw pointers or narrow oops |
0 | 453 } |
454 return ConstraintCastNode::Ideal_DU_postCCP(ccp); | |
455 } | |
456 | |
457 | |
458 | |
459 //============================================================================= | |
460 //------------------------------Identity--------------------------------------- | |
461 // If input is already higher or equal to cast type, then this is an identity. | |
462 Node *CheckCastPPNode::Identity( PhaseTransform *phase ) { | |
463 // Toned down to rescue meeting at a Phi 3 different oops all implementing | |
464 // the same interface. CompileTheWorld starting at 502, kd12rc1.zip. | |
465 return (phase->type(in(1)) == phase->type(this)) ? in(1) : this; | |
466 } | |
467 | |
468 //------------------------------Value------------------------------------------ | |
469 // Take 'join' of input and cast-up type, unless working with an Interface | |
470 const Type *CheckCastPPNode::Value( PhaseTransform *phase ) const { | |
471 if( in(0) && phase->type(in(0)) == Type::TOP ) return Type::TOP; | |
472 | |
473 const Type *inn = phase->type(in(1)); | |
474 if( inn == Type::TOP ) return Type::TOP; // No information yet | |
475 | |
476 const TypePtr *in_type = inn->isa_ptr(); | |
477 const TypePtr *my_type = _type->isa_ptr(); | |
478 const Type *result = _type; | |
479 if( in_type != NULL && my_type != NULL ) { | |
480 TypePtr::PTR in_ptr = in_type->ptr(); | |
481 if( in_ptr == TypePtr::Null ) { | |
482 result = in_type; | |
483 } else if( in_ptr == TypePtr::Constant ) { | |
484 // Casting a constant oop to an interface? | |
485 // (i.e., a String to a Comparable?) | |
486 // Then return the interface. | |
487 const TypeOopPtr *jptr = my_type->isa_oopptr(); | |
488 assert( jptr, "" ); | |
489 result = (jptr->klass()->is_interface() || !in_type->higher_equal(_type)) | |
490 ? my_type->cast_to_ptr_type( TypePtr::NotNull ) | |
491 : in_type; | |
492 } else { | |
493 result = my_type->cast_to_ptr_type( my_type->join_ptr(in_ptr) ); | |
494 } | |
495 } | |
496 return result; | |
497 | |
498 // JOIN NOT DONE HERE BECAUSE OF INTERFACE ISSUES. | |
499 // FIX THIS (DO THE JOIN) WHEN UNION TYPES APPEAR! | |
500 | |
501 // | |
502 // Remove this code after overnight run indicates no performance | |
503 // loss from not performing JOIN at CheckCastPPNode | |
504 // | |
505 // const TypeInstPtr *in_oop = in->isa_instptr(); | |
506 // const TypeInstPtr *my_oop = _type->isa_instptr(); | |
507 // // If either input is an 'interface', return destination type | |
508 // assert (in_oop == NULL || in_oop->klass() != NULL, ""); | |
509 // assert (my_oop == NULL || my_oop->klass() != NULL, ""); | |
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510 // if( (in_oop && in_oop->klass()->is_interface()) |
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511 // ||(my_oop && my_oop->klass()->is_interface()) ) { |
0 | 512 // TypePtr::PTR in_ptr = in->isa_ptr() ? in->is_ptr()->_ptr : TypePtr::BotPTR; |
513 // // Preserve cast away nullness for interfaces | |
514 // if( in_ptr == TypePtr::NotNull && my_oop && my_oop->_ptr == TypePtr::BotPTR ) { | |
515 // return my_oop->cast_to_ptr_type(TypePtr::NotNull); | |
516 // } | |
517 // return _type; | |
518 // } | |
519 // | |
520 // // Neither the input nor the destination type is an interface, | |
521 // | |
522 // // history: JOIN used to cause weird corner case bugs | |
523 // // return (in == TypeOopPtr::NULL_PTR) ? in : _type; | |
524 // // JOIN picks up NotNull in common instance-of/check-cast idioms, both oops. | |
525 // // JOIN does not preserve NotNull in other cases, e.g. RawPtr vs InstPtr | |
526 // const Type *join = in->join(_type); | |
527 // // Check if join preserved NotNull'ness for pointers | |
528 // if( join->isa_ptr() && _type->isa_ptr() ) { | |
529 // TypePtr::PTR join_ptr = join->is_ptr()->_ptr; | |
530 // TypePtr::PTR type_ptr = _type->is_ptr()->_ptr; | |
531 // // If there isn't any NotNull'ness to preserve | |
532 // // OR if join preserved NotNull'ness then return it | |
533 // if( type_ptr == TypePtr::BotPTR || type_ptr == TypePtr::Null || | |
534 // join_ptr == TypePtr::NotNull || join_ptr == TypePtr::Constant ) { | |
535 // return join; | |
536 // } | |
537 // // ELSE return same old type as before | |
538 // return _type; | |
539 // } | |
540 // // Not joining two pointers | |
541 // return join; | |
542 } | |
543 | |
544 //------------------------------Ideal------------------------------------------ | |
545 // Return a node which is more "ideal" than the current node. Strip out | |
546 // control copies | |
547 Node *CheckCastPPNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
548 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; | |
549 } | |
550 | |
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551 |
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552 Node* DecodeNNode::Identity(PhaseTransform* phase) { |
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553 const Type *t = phase->type( in(1) ); |
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554 if( t == Type::TOP ) return in(1); |
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555 |
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556 if (in(1)->is_EncodeP()) { |
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557 // (DecodeN (EncodeP p)) -> p |
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558 return in(1)->in(1); |
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559 } |
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560 return this; |
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561 } |
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562 |
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563 const Type *DecodeNNode::Value( PhaseTransform *phase ) const { |
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564 const Type *t = phase->type( in(1) ); |
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565 if (t == Type::TOP) return Type::TOP; |
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566 if (t == TypeNarrowOop::NULL_PTR) return TypePtr::NULL_PTR; |
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567 |
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568 assert(t->isa_narrowoop(), "only narrowoop here"); |
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569 return t->make_ptr(); |
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570 } |
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571 |
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572 Node* EncodePNode::Identity(PhaseTransform* phase) { |
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573 const Type *t = phase->type( in(1) ); |
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574 if( t == Type::TOP ) return in(1); |
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575 |
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576 if (in(1)->is_DecodeN()) { |
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577 // (EncodeP (DecodeN p)) -> p |
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578 return in(1)->in(1); |
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579 } |
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580 return this; |
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581 } |
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582 |
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583 const Type *EncodePNode::Value( PhaseTransform *phase ) const { |
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584 const Type *t = phase->type( in(1) ); |
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585 if (t == Type::TOP) return Type::TOP; |
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586 if (t == TypePtr::NULL_PTR) return TypeNarrowOop::NULL_PTR; |
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587 |
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588 assert(t->isa_oop_ptr(), "only oopptr here"); |
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589 return t->make_narrowoop(); |
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590 } |
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591 |
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592 |
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593 Node *EncodeNarrowPtrNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { |
163 | 594 return MemNode::Ideal_common_DU_postCCP(ccp, this, in(1)); |
595 } | |
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596 |
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597 Node* DecodeNKlassNode::Identity(PhaseTransform* phase) { |
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598 const Type *t = phase->type( in(1) ); |
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599 if( t == Type::TOP ) return in(1); |
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600 |
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601 if (in(1)->is_EncodePKlass()) { |
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602 // (DecodeNKlass (EncodePKlass p)) -> p |
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603 return in(1)->in(1); |
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604 } |
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605 return this; |
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606 } |
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607 |
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608 const Type *DecodeNKlassNode::Value( PhaseTransform *phase ) const { |
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609 const Type *t = phase->type( in(1) ); |
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610 if (t == Type::TOP) return Type::TOP; |
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611 assert(t != TypeNarrowKlass::NULL_PTR, "null klass?"); |
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612 |
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613 assert(t->isa_narrowklass(), "only narrow klass ptr here"); |
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614 return t->make_ptr(); |
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615 } |
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616 |
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617 Node* EncodePKlassNode::Identity(PhaseTransform* phase) { |
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618 const Type *t = phase->type( in(1) ); |
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619 if( t == Type::TOP ) return in(1); |
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620 |
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621 if (in(1)->is_DecodeNKlass()) { |
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622 // (EncodePKlass (DecodeNKlass p)) -> p |
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623 return in(1)->in(1); |
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624 } |
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625 return this; |
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626 } |
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627 |
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628 const Type *EncodePKlassNode::Value( PhaseTransform *phase ) const { |
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629 const Type *t = phase->type( in(1) ); |
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630 if (t == Type::TOP) return Type::TOP; |
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631 assert (t != TypePtr::NULL_PTR, "null klass?"); |
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632 |
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633 assert(UseCompressedClassPointers && t->isa_klassptr(), "only klass ptr here"); |
6848
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634 return t->make_narrowklass(); |
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635 } |
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636 |
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637 |
0 | 638 //============================================================================= |
639 //------------------------------Identity--------------------------------------- | |
640 Node *Conv2BNode::Identity( PhaseTransform *phase ) { | |
641 const Type *t = phase->type( in(1) ); | |
642 if( t == Type::TOP ) return in(1); | |
643 if( t == TypeInt::ZERO ) return in(1); | |
644 if( t == TypeInt::ONE ) return in(1); | |
645 if( t == TypeInt::BOOL ) return in(1); | |
646 return this; | |
647 } | |
648 | |
649 //------------------------------Value------------------------------------------ | |
650 const Type *Conv2BNode::Value( PhaseTransform *phase ) const { | |
651 const Type *t = phase->type( in(1) ); | |
652 if( t == Type::TOP ) return Type::TOP; | |
653 if( t == TypeInt::ZERO ) return TypeInt::ZERO; | |
654 if( t == TypePtr::NULL_PTR ) return TypeInt::ZERO; | |
655 const TypePtr *tp = t->isa_ptr(); | |
656 if( tp != NULL ) { | |
657 if( tp->ptr() == TypePtr::AnyNull ) return Type::TOP; | |
658 if( tp->ptr() == TypePtr::Constant) return TypeInt::ONE; | |
659 if (tp->ptr() == TypePtr::NotNull) return TypeInt::ONE; | |
660 return TypeInt::BOOL; | |
661 } | |
662 if (t->base() != Type::Int) return TypeInt::BOOL; | |
663 const TypeInt *ti = t->is_int(); | |
664 if( ti->_hi < 0 || ti->_lo > 0 ) return TypeInt::ONE; | |
665 return TypeInt::BOOL; | |
666 } | |
667 | |
668 | |
669 // The conversions operations are all Alpha sorted. Please keep it that way! | |
670 //============================================================================= | |
671 //------------------------------Value------------------------------------------ | |
672 const Type *ConvD2FNode::Value( PhaseTransform *phase ) const { | |
673 const Type *t = phase->type( in(1) ); | |
674 if( t == Type::TOP ) return Type::TOP; | |
675 if( t == Type::DOUBLE ) return Type::FLOAT; | |
676 const TypeD *td = t->is_double_constant(); | |
677 return TypeF::make( (float)td->getd() ); | |
678 } | |
679 | |
680 //------------------------------Identity--------------------------------------- | |
681 // Float's can be converted to doubles with no loss of bits. Hence | |
682 // converting a float to a double and back to a float is a NOP. | |
683 Node *ConvD2FNode::Identity(PhaseTransform *phase) { | |
684 return (in(1)->Opcode() == Op_ConvF2D) ? in(1)->in(1) : this; | |
685 } | |
686 | |
687 //============================================================================= | |
688 //------------------------------Value------------------------------------------ | |
689 const Type *ConvD2INode::Value( PhaseTransform *phase ) const { | |
690 const Type *t = phase->type( in(1) ); | |
691 if( t == Type::TOP ) return Type::TOP; | |
692 if( t == Type::DOUBLE ) return TypeInt::INT; | |
693 const TypeD *td = t->is_double_constant(); | |
694 return TypeInt::make( SharedRuntime::d2i( td->getd() ) ); | |
695 } | |
696 | |
697 //------------------------------Ideal------------------------------------------ | |
698 // If converting to an int type, skip any rounding nodes | |
699 Node *ConvD2INode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
700 if( in(1)->Opcode() == Op_RoundDouble ) | |
701 set_req(1,in(1)->in(1)); | |
702 return NULL; | |
703 } | |
704 | |
705 //------------------------------Identity--------------------------------------- | |
706 // Int's can be converted to doubles with no loss of bits. Hence | |
707 // converting an integer to a double and back to an integer is a NOP. | |
708 Node *ConvD2INode::Identity(PhaseTransform *phase) { | |
709 return (in(1)->Opcode() == Op_ConvI2D) ? in(1)->in(1) : this; | |
710 } | |
711 | |
712 //============================================================================= | |
713 //------------------------------Value------------------------------------------ | |
714 const Type *ConvD2LNode::Value( PhaseTransform *phase ) const { | |
715 const Type *t = phase->type( in(1) ); | |
716 if( t == Type::TOP ) return Type::TOP; | |
717 if( t == Type::DOUBLE ) return TypeLong::LONG; | |
718 const TypeD *td = t->is_double_constant(); | |
719 return TypeLong::make( SharedRuntime::d2l( td->getd() ) ); | |
720 } | |
721 | |
722 //------------------------------Identity--------------------------------------- | |
723 Node *ConvD2LNode::Identity(PhaseTransform *phase) { | |
724 // Remove ConvD2L->ConvL2D->ConvD2L sequences. | |
725 if( in(1) ->Opcode() == Op_ConvL2D && | |
726 in(1)->in(1)->Opcode() == Op_ConvD2L ) | |
727 return in(1)->in(1); | |
728 return this; | |
729 } | |
730 | |
731 //------------------------------Ideal------------------------------------------ | |
732 // If converting to an int type, skip any rounding nodes | |
733 Node *ConvD2LNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
734 if( in(1)->Opcode() == Op_RoundDouble ) | |
735 set_req(1,in(1)->in(1)); | |
736 return NULL; | |
737 } | |
738 | |
739 //============================================================================= | |
740 //------------------------------Value------------------------------------------ | |
741 const Type *ConvF2DNode::Value( PhaseTransform *phase ) const { | |
742 const Type *t = phase->type( in(1) ); | |
743 if( t == Type::TOP ) return Type::TOP; | |
744 if( t == Type::FLOAT ) return Type::DOUBLE; | |
745 const TypeF *tf = t->is_float_constant(); | |
746 return TypeD::make( (double)tf->getf() ); | |
747 } | |
748 | |
749 //============================================================================= | |
750 //------------------------------Value------------------------------------------ | |
751 const Type *ConvF2INode::Value( PhaseTransform *phase ) const { | |
752 const Type *t = phase->type( in(1) ); | |
753 if( t == Type::TOP ) return Type::TOP; | |
754 if( t == Type::FLOAT ) return TypeInt::INT; | |
755 const TypeF *tf = t->is_float_constant(); | |
756 return TypeInt::make( SharedRuntime::f2i( tf->getf() ) ); | |
757 } | |
758 | |
759 //------------------------------Identity--------------------------------------- | |
760 Node *ConvF2INode::Identity(PhaseTransform *phase) { | |
761 // Remove ConvF2I->ConvI2F->ConvF2I sequences. | |
762 if( in(1) ->Opcode() == Op_ConvI2F && | |
763 in(1)->in(1)->Opcode() == Op_ConvF2I ) | |
764 return in(1)->in(1); | |
765 return this; | |
766 } | |
767 | |
768 //------------------------------Ideal------------------------------------------ | |
769 // If converting to an int type, skip any rounding nodes | |
770 Node *ConvF2INode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
771 if( in(1)->Opcode() == Op_RoundFloat ) | |
772 set_req(1,in(1)->in(1)); | |
773 return NULL; | |
774 } | |
775 | |
776 //============================================================================= | |
777 //------------------------------Value------------------------------------------ | |
778 const Type *ConvF2LNode::Value( PhaseTransform *phase ) const { | |
779 const Type *t = phase->type( in(1) ); | |
780 if( t == Type::TOP ) return Type::TOP; | |
781 if( t == Type::FLOAT ) return TypeLong::LONG; | |
782 const TypeF *tf = t->is_float_constant(); | |
783 return TypeLong::make( SharedRuntime::f2l( tf->getf() ) ); | |
784 } | |
785 | |
786 //------------------------------Identity--------------------------------------- | |
787 Node *ConvF2LNode::Identity(PhaseTransform *phase) { | |
788 // Remove ConvF2L->ConvL2F->ConvF2L sequences. | |
789 if( in(1) ->Opcode() == Op_ConvL2F && | |
790 in(1)->in(1)->Opcode() == Op_ConvF2L ) | |
791 return in(1)->in(1); | |
792 return this; | |
793 } | |
794 | |
795 //------------------------------Ideal------------------------------------------ | |
796 // If converting to an int type, skip any rounding nodes | |
797 Node *ConvF2LNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
798 if( in(1)->Opcode() == Op_RoundFloat ) | |
799 set_req(1,in(1)->in(1)); | |
800 return NULL; | |
801 } | |
802 | |
803 //============================================================================= | |
804 //------------------------------Value------------------------------------------ | |
805 const Type *ConvI2DNode::Value( PhaseTransform *phase ) const { | |
806 const Type *t = phase->type( in(1) ); | |
807 if( t == Type::TOP ) return Type::TOP; | |
808 const TypeInt *ti = t->is_int(); | |
809 if( ti->is_con() ) return TypeD::make( (double)ti->get_con() ); | |
810 return bottom_type(); | |
811 } | |
812 | |
813 //============================================================================= | |
814 //------------------------------Value------------------------------------------ | |
815 const Type *ConvI2FNode::Value( PhaseTransform *phase ) const { | |
816 const Type *t = phase->type( in(1) ); | |
817 if( t == Type::TOP ) return Type::TOP; | |
818 const TypeInt *ti = t->is_int(); | |
819 if( ti->is_con() ) return TypeF::make( (float)ti->get_con() ); | |
820 return bottom_type(); | |
821 } | |
822 | |
823 //------------------------------Identity--------------------------------------- | |
824 Node *ConvI2FNode::Identity(PhaseTransform *phase) { | |
825 // Remove ConvI2F->ConvF2I->ConvI2F sequences. | |
826 if( in(1) ->Opcode() == Op_ConvF2I && | |
827 in(1)->in(1)->Opcode() == Op_ConvI2F ) | |
828 return in(1)->in(1); | |
829 return this; | |
830 } | |
831 | |
832 //============================================================================= | |
833 //------------------------------Value------------------------------------------ | |
834 const Type *ConvI2LNode::Value( PhaseTransform *phase ) const { | |
835 const Type *t = phase->type( in(1) ); | |
836 if( t == Type::TOP ) return Type::TOP; | |
837 const TypeInt *ti = t->is_int(); | |
838 const Type* tl = TypeLong::make(ti->_lo, ti->_hi, ti->_widen); | |
839 // Join my declared type against my incoming type. | |
840 tl = tl->filter(_type); | |
841 return tl; | |
842 } | |
843 | |
844 #ifdef _LP64 | |
845 static inline bool long_ranges_overlap(jlong lo1, jlong hi1, | |
846 jlong lo2, jlong hi2) { | |
847 // Two ranges overlap iff one range's low point falls in the other range. | |
848 return (lo2 <= lo1 && lo1 <= hi2) || (lo1 <= lo2 && lo2 <= hi1); | |
849 } | |
850 #endif | |
851 | |
852 //------------------------------Ideal------------------------------------------ | |
853 Node *ConvI2LNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
854 const TypeLong* this_type = this->type()->is_long(); | |
855 Node* this_changed = NULL; | |
856 | |
857 // If _major_progress, then more loop optimizations follow. Do NOT | |
858 // remove this node's type assertion until no more loop ops can happen. | |
859 // The progress bit is set in the major loop optimizations THEN comes the | |
860 // call to IterGVN and any chance of hitting this code. Cf. Opaque1Node. | |
861 if (can_reshape && !phase->C->major_progress()) { | |
862 const TypeInt* in_type = phase->type(in(1))->isa_int(); | |
863 if (in_type != NULL && this_type != NULL && | |
864 (in_type->_lo != this_type->_lo || | |
865 in_type->_hi != this_type->_hi)) { | |
866 // Although this WORSENS the type, it increases GVN opportunities, | |
867 // because I2L nodes with the same input will common up, regardless | |
868 // of slightly differing type assertions. Such slight differences | |
869 // arise routinely as a result of loop unrolling, so this is a | |
870 // post-unrolling graph cleanup. Choose a type which depends only | |
871 // on my input. (Exception: Keep a range assertion of >=0 or <0.) | |
872 jlong lo1 = this_type->_lo; | |
873 jlong hi1 = this_type->_hi; | |
874 int w1 = this_type->_widen; | |
875 if (lo1 != (jint)lo1 || | |
876 hi1 != (jint)hi1 || | |
877 lo1 > hi1) { | |
878 // Overflow leads to wraparound, wraparound leads to range saturation. | |
879 lo1 = min_jint; hi1 = max_jint; | |
880 } else if (lo1 >= 0) { | |
881 // Keep a range assertion of >=0. | |
882 lo1 = 0; hi1 = max_jint; | |
883 } else if (hi1 < 0) { | |
884 // Keep a range assertion of <0. | |
885 lo1 = min_jint; hi1 = -1; | |
886 } else { | |
887 lo1 = min_jint; hi1 = max_jint; | |
888 } | |
889 const TypeLong* wtype = TypeLong::make(MAX2((jlong)in_type->_lo, lo1), | |
890 MIN2((jlong)in_type->_hi, hi1), | |
891 MAX2((int)in_type->_widen, w1)); | |
892 if (wtype != type()) { | |
893 set_type(wtype); | |
894 // Note: this_type still has old type value, for the logic below. | |
895 this_changed = this; | |
896 } | |
897 } | |
898 } | |
899 | |
900 #ifdef _LP64 | |
901 // Convert ConvI2L(AddI(x, y)) to AddL(ConvI2L(x), ConvI2L(y)) , | |
902 // but only if x and y have subranges that cannot cause 32-bit overflow, | |
903 // under the assumption that x+y is in my own subrange this->type(). | |
904 | |
905 // This assumption is based on a constraint (i.e., type assertion) | |
906 // established in Parse::array_addressing or perhaps elsewhere. | |
907 // This constraint has been adjoined to the "natural" type of | |
908 // the incoming argument in(0). We know (because of runtime | |
909 // checks) - that the result value I2L(x+y) is in the joined range. | |
910 // Hence we can restrict the incoming terms (x, y) to values such | |
911 // that their sum also lands in that range. | |
912 | |
913 // This optimization is useful only on 64-bit systems, where we hope | |
914 // the addition will end up subsumed in an addressing mode. | |
915 // It is necessary to do this when optimizing an unrolled array | |
916 // copy loop such as x[i++] = y[i++]. | |
917 | |
918 // On 32-bit systems, it's better to perform as much 32-bit math as | |
919 // possible before the I2L conversion, because 32-bit math is cheaper. | |
920 // There's no common reason to "leak" a constant offset through the I2L. | |
921 // Addressing arithmetic will not absorb it as part of a 64-bit AddL. | |
922 | |
923 Node* z = in(1); | |
924 int op = z->Opcode(); | |
925 if (op == Op_AddI || op == Op_SubI) { | |
926 Node* x = z->in(1); | |
927 Node* y = z->in(2); | |
928 assert (x != z && y != z, "dead loop in ConvI2LNode::Ideal"); | |
929 if (phase->type(x) == Type::TOP) return this_changed; | |
930 if (phase->type(y) == Type::TOP) return this_changed; | |
931 const TypeInt* tx = phase->type(x)->is_int(); | |
932 const TypeInt* ty = phase->type(y)->is_int(); | |
933 const TypeLong* tz = this_type; | |
934 jlong xlo = tx->_lo; | |
935 jlong xhi = tx->_hi; | |
936 jlong ylo = ty->_lo; | |
937 jlong yhi = ty->_hi; | |
938 jlong zlo = tz->_lo; | |
939 jlong zhi = tz->_hi; | |
940 jlong vbit = CONST64(1) << BitsPerInt; | |
941 int widen = MAX2(tx->_widen, ty->_widen); | |
942 if (op == Op_SubI) { | |
943 jlong ylo0 = ylo; | |
944 ylo = -yhi; | |
945 yhi = -ylo0; | |
946 } | |
947 // See if x+y can cause positive overflow into z+2**32 | |
948 if (long_ranges_overlap(xlo+ylo, xhi+yhi, zlo+vbit, zhi+vbit)) { | |
949 return this_changed; | |
950 } | |
951 // See if x+y can cause negative overflow into z-2**32 | |
952 if (long_ranges_overlap(xlo+ylo, xhi+yhi, zlo-vbit, zhi-vbit)) { | |
953 return this_changed; | |
954 } | |
955 // Now it's always safe to assume x+y does not overflow. | |
956 // This is true even if some pairs x,y might cause overflow, as long | |
957 // as that overflow value cannot fall into [zlo,zhi]. | |
958 | |
959 // Confident that the arithmetic is "as if infinite precision", | |
960 // we can now use z's range to put constraints on those of x and y. | |
961 // The "natural" range of x [xlo,xhi] can perhaps be narrowed to a | |
962 // more "restricted" range by intersecting [xlo,xhi] with the | |
963 // range obtained by subtracting y's range from the asserted range | |
964 // of the I2L conversion. Here's the interval arithmetic algebra: | |
965 // x == z-y == [zlo,zhi]-[ylo,yhi] == [zlo,zhi]+[-yhi,-ylo] | |
966 // => x in [zlo-yhi, zhi-ylo] | |
967 // => x in [zlo-yhi, zhi-ylo] INTERSECT [xlo,xhi] | |
968 // => x in [xlo MAX zlo-yhi, xhi MIN zhi-ylo] | |
969 jlong rxlo = MAX2(xlo, zlo - yhi); | |
970 jlong rxhi = MIN2(xhi, zhi - ylo); | |
971 // And similarly, x changing place with y: | |
972 jlong rylo = MAX2(ylo, zlo - xhi); | |
973 jlong ryhi = MIN2(yhi, zhi - xlo); | |
974 if (rxlo > rxhi || rylo > ryhi) { | |
975 return this_changed; // x or y is dying; don't mess w/ it | |
976 } | |
977 if (op == Op_SubI) { | |
978 jlong rylo0 = rylo; | |
979 rylo = -ryhi; | |
980 ryhi = -rylo0; | |
981 } | |
982 | |
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983 Node* cx = phase->transform( new (phase->C) ConvI2LNode(x, TypeLong::make(rxlo, rxhi, widen)) ); |
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984 Node* cy = phase->transform( new (phase->C) ConvI2LNode(y, TypeLong::make(rylo, ryhi, widen)) ); |
0 | 985 switch (op) { |
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986 case Op_AddI: return new (phase->C) AddLNode(cx, cy); |
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987 case Op_SubI: return new (phase->C) SubLNode(cx, cy); |
0 | 988 default: ShouldNotReachHere(); |
989 } | |
990 } | |
991 #endif //_LP64 | |
992 | |
993 return this_changed; | |
994 } | |
995 | |
996 //============================================================================= | |
997 //------------------------------Value------------------------------------------ | |
998 const Type *ConvL2DNode::Value( PhaseTransform *phase ) const { | |
999 const Type *t = phase->type( in(1) ); | |
1000 if( t == Type::TOP ) return Type::TOP; | |
1001 const TypeLong *tl = t->is_long(); | |
1002 if( tl->is_con() ) return TypeD::make( (double)tl->get_con() ); | |
1003 return bottom_type(); | |
1004 } | |
1005 | |
1006 //============================================================================= | |
1007 //------------------------------Value------------------------------------------ | |
1008 const Type *ConvL2FNode::Value( PhaseTransform *phase ) const { | |
1009 const Type *t = phase->type( in(1) ); | |
1010 if( t == Type::TOP ) return Type::TOP; | |
1011 const TypeLong *tl = t->is_long(); | |
1012 if( tl->is_con() ) return TypeF::make( (float)tl->get_con() ); | |
1013 return bottom_type(); | |
1014 } | |
1015 | |
1016 //============================================================================= | |
1017 //----------------------------Identity----------------------------------------- | |
1018 Node *ConvL2INode::Identity( PhaseTransform *phase ) { | |
1019 // Convert L2I(I2L(x)) => x | |
1020 if (in(1)->Opcode() == Op_ConvI2L) return in(1)->in(1); | |
1021 return this; | |
1022 } | |
1023 | |
1024 //------------------------------Value------------------------------------------ | |
1025 const Type *ConvL2INode::Value( PhaseTransform *phase ) const { | |
1026 const Type *t = phase->type( in(1) ); | |
1027 if( t == Type::TOP ) return Type::TOP; | |
1028 const TypeLong *tl = t->is_long(); | |
1029 if (tl->is_con()) | |
1030 // Easy case. | |
1031 return TypeInt::make((jint)tl->get_con()); | |
1032 return bottom_type(); | |
1033 } | |
1034 | |
1035 //------------------------------Ideal------------------------------------------ | |
1036 // Return a node which is more "ideal" than the current node. | |
1037 // Blow off prior masking to int | |
1038 Node *ConvL2INode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1039 Node *andl = in(1); | |
1040 uint andl_op = andl->Opcode(); | |
1041 if( andl_op == Op_AndL ) { | |
1042 // Blow off prior masking to int | |
1043 if( phase->type(andl->in(2)) == TypeLong::make( 0xFFFFFFFF ) ) { | |
1044 set_req(1,andl->in(1)); | |
1045 return this; | |
1046 } | |
1047 } | |
1048 | |
1049 // Swap with a prior add: convL2I(addL(x,y)) ==> addI(convL2I(x),convL2I(y)) | |
1050 // This replaces an 'AddL' with an 'AddI'. | |
1051 if( andl_op == Op_AddL ) { | |
1052 // Don't do this for nodes which have more than one user since | |
1053 // we'll end up computing the long add anyway. | |
1054 if (andl->outcnt() > 1) return NULL; | |
1055 | |
1056 Node* x = andl->in(1); | |
1057 Node* y = andl->in(2); | |
1058 assert( x != andl && y != andl, "dead loop in ConvL2INode::Ideal" ); | |
1059 if (phase->type(x) == Type::TOP) return NULL; | |
1060 if (phase->type(y) == Type::TOP) return NULL; | |
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1061 Node *add1 = phase->transform(new (phase->C) ConvL2INode(x)); |
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1062 Node *add2 = phase->transform(new (phase->C) ConvL2INode(y)); |
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1063 return new (phase->C) AddINode(add1,add2); |
0 | 1064 } |
1065 | |
36 | 1066 // Disable optimization: LoadL->ConvL2I ==> LoadI. |
1067 // It causes problems (sizes of Load and Store nodes do not match) | |
1068 // in objects initialization code and Escape Analysis. | |
0 | 1069 return NULL; |
1070 } | |
1071 | |
1072 //============================================================================= | |
1073 //------------------------------Value------------------------------------------ | |
1074 const Type *CastX2PNode::Value( PhaseTransform *phase ) const { | |
1075 const Type* t = phase->type(in(1)); | |
5901 | 1076 if (t == Type::TOP) return Type::TOP; |
0 | 1077 if (t->base() == Type_X && t->singleton()) { |
1078 uintptr_t bits = (uintptr_t) t->is_intptr_t()->get_con(); | |
1079 if (bits == 0) return TypePtr::NULL_PTR; | |
1080 return TypeRawPtr::make((address) bits); | |
1081 } | |
1082 return CastX2PNode::bottom_type(); | |
1083 } | |
1084 | |
1085 //------------------------------Idealize--------------------------------------- | |
1086 static inline bool fits_in_int(const Type* t, bool but_not_min_int = false) { | |
1087 if (t == Type::TOP) return false; | |
1088 const TypeX* tl = t->is_intptr_t(); | |
1089 jint lo = min_jint; | |
1090 jint hi = max_jint; | |
1091 if (but_not_min_int) ++lo; // caller wants to negate the value w/o overflow | |
1092 return (tl->_lo >= lo) && (tl->_hi <= hi); | |
1093 } | |
1094 | |
1095 static inline Node* addP_of_X2P(PhaseGVN *phase, | |
1096 Node* base, | |
1097 Node* dispX, | |
1098 bool negate = false) { | |
1099 if (negate) { | |
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1100 dispX = new (phase->C) SubXNode(phase->MakeConX(0), phase->transform(dispX)); |
0 | 1101 } |
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1102 return new (phase->C) AddPNode(phase->C->top(), |
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1103 phase->transform(new (phase->C) CastX2PNode(base)), |
0 | 1104 phase->transform(dispX)); |
1105 } | |
1106 | |
1107 Node *CastX2PNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1108 // convert CastX2P(AddX(x, y)) to AddP(CastX2P(x), y) if y fits in an int | |
1109 int op = in(1)->Opcode(); | |
1110 Node* x; | |
1111 Node* y; | |
1112 switch (op) { | |
1113 case Op_SubX: | |
1114 x = in(1)->in(1); | |
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1115 // Avoid ideal transformations ping-pong between this and AddP for raw pointers. |
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1116 if (phase->find_intptr_t_con(x, -1) == 0) |
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1117 break; |
0 | 1118 y = in(1)->in(2); |
1119 if (fits_in_int(phase->type(y), true)) { | |
1120 return addP_of_X2P(phase, x, y, true); | |
1121 } | |
1122 break; | |
1123 case Op_AddX: | |
1124 x = in(1)->in(1); | |
1125 y = in(1)->in(2); | |
1126 if (fits_in_int(phase->type(y))) { | |
1127 return addP_of_X2P(phase, x, y); | |
1128 } | |
1129 if (fits_in_int(phase->type(x))) { | |
1130 return addP_of_X2P(phase, y, x); | |
1131 } | |
1132 break; | |
1133 } | |
1134 return NULL; | |
1135 } | |
1136 | |
1137 //------------------------------Identity--------------------------------------- | |
1138 Node *CastX2PNode::Identity( PhaseTransform *phase ) { | |
1139 if (in(1)->Opcode() == Op_CastP2X) return in(1)->in(1); | |
1140 return this; | |
1141 } | |
1142 | |
1143 //============================================================================= | |
1144 //------------------------------Value------------------------------------------ | |
1145 const Type *CastP2XNode::Value( PhaseTransform *phase ) const { | |
1146 const Type* t = phase->type(in(1)); | |
5901 | 1147 if (t == Type::TOP) return Type::TOP; |
0 | 1148 if (t->base() == Type::RawPtr && t->singleton()) { |
1149 uintptr_t bits = (uintptr_t) t->is_rawptr()->get_con(); | |
1150 return TypeX::make(bits); | |
1151 } | |
1152 return CastP2XNode::bottom_type(); | |
1153 } | |
1154 | |
1155 Node *CastP2XNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1156 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; | |
1157 } | |
1158 | |
1159 //------------------------------Identity--------------------------------------- | |
1160 Node *CastP2XNode::Identity( PhaseTransform *phase ) { | |
1161 if (in(1)->Opcode() == Op_CastX2P) return in(1)->in(1); | |
1162 return this; | |
1163 } | |
1164 | |
1165 | |
1166 //============================================================================= | |
1167 //------------------------------Identity--------------------------------------- | |
1168 // Remove redundant roundings | |
1169 Node *RoundFloatNode::Identity( PhaseTransform *phase ) { | |
1170 assert(Matcher::strict_fp_requires_explicit_rounding, "should only generate for Intel"); | |
1171 // Do not round constants | |
1172 if (phase->type(in(1))->base() == Type::FloatCon) return in(1); | |
1173 int op = in(1)->Opcode(); | |
1174 // Redundant rounding | |
1175 if( op == Op_RoundFloat ) return in(1); | |
1176 // Already rounded | |
1177 if( op == Op_Parm ) return in(1); | |
1178 if( op == Op_LoadF ) return in(1); | |
1179 return this; | |
1180 } | |
1181 | |
1182 //------------------------------Value------------------------------------------ | |
1183 const Type *RoundFloatNode::Value( PhaseTransform *phase ) const { | |
1184 return phase->type( in(1) ); | |
1185 } | |
1186 | |
1187 //============================================================================= | |
1188 //------------------------------Identity--------------------------------------- | |
1189 // Remove redundant roundings. Incoming arguments are already rounded. | |
1190 Node *RoundDoubleNode::Identity( PhaseTransform *phase ) { | |
1191 assert(Matcher::strict_fp_requires_explicit_rounding, "should only generate for Intel"); | |
1192 // Do not round constants | |
1193 if (phase->type(in(1))->base() == Type::DoubleCon) return in(1); | |
1194 int op = in(1)->Opcode(); | |
1195 // Redundant rounding | |
1196 if( op == Op_RoundDouble ) return in(1); | |
1197 // Already rounded | |
1198 if( op == Op_Parm ) return in(1); | |
1199 if( op == Op_LoadD ) return in(1); | |
1200 if( op == Op_ConvF2D ) return in(1); | |
1201 if( op == Op_ConvI2D ) return in(1); | |
1202 return this; | |
1203 } | |
1204 | |
1205 //------------------------------Value------------------------------------------ | |
1206 const Type *RoundDoubleNode::Value( PhaseTransform *phase ) const { | |
1207 return phase->type( in(1) ); | |
1208 } | |
1209 | |
1210 | |
1211 //============================================================================= | |
1212 // Do not allow value-numbering | |
1213 uint Opaque1Node::hash() const { return NO_HASH; } | |
1214 uint Opaque1Node::cmp( const Node &n ) const { | |
1215 return (&n == this); // Always fail except on self | |
1216 } | |
1217 | |
1218 //------------------------------Identity--------------------------------------- | |
1219 // If _major_progress, then more loop optimizations follow. Do NOT remove | |
1220 // the opaque Node until no more loop ops can happen. Note the timing of | |
1221 // _major_progress; it's set in the major loop optimizations THEN comes the | |
1222 // call to IterGVN and any chance of hitting this code. Hence there's no | |
1223 // phase-ordering problem with stripping Opaque1 in IGVN followed by some | |
1224 // more loop optimizations that require it. | |
1225 Node *Opaque1Node::Identity( PhaseTransform *phase ) { | |
1226 return phase->C->major_progress() ? this : in(1); | |
1227 } | |
1228 | |
1229 //============================================================================= | |
1230 // A node to prevent unwanted optimizations. Allows constant folding. Stops | |
1231 // value-numbering, most Ideal calls or Identity functions. This Node is | |
1232 // specifically designed to prevent the pre-increment value of a loop trip | |
1233 // counter from being live out of the bottom of the loop (hence causing the | |
1234 // pre- and post-increment values both being live and thus requiring an extra | |
1235 // temp register and an extra move). If we "accidentally" optimize through | |
1236 // this kind of a Node, we'll get slightly pessimal, but correct, code. Thus | |
1237 // it's OK to be slightly sloppy on optimizations here. | |
1238 | |
1239 // Do not allow value-numbering | |
1240 uint Opaque2Node::hash() const { return NO_HASH; } | |
1241 uint Opaque2Node::cmp( const Node &n ) const { | |
1242 return (&n == this); // Always fail except on self | |
1243 } | |
1244 | |
1245 | |
1246 //------------------------------Value------------------------------------------ | |
1247 const Type *MoveL2DNode::Value( PhaseTransform *phase ) const { | |
1248 const Type *t = phase->type( in(1) ); | |
1249 if( t == Type::TOP ) return Type::TOP; | |
1250 const TypeLong *tl = t->is_long(); | |
1251 if( !tl->is_con() ) return bottom_type(); | |
1252 JavaValue v; | |
1253 v.set_jlong(tl->get_con()); | |
1254 return TypeD::make( v.get_jdouble() ); | |
1255 } | |
1256 | |
1257 //------------------------------Value------------------------------------------ | |
1258 const Type *MoveI2FNode::Value( PhaseTransform *phase ) const { | |
1259 const Type *t = phase->type( in(1) ); | |
1260 if( t == Type::TOP ) return Type::TOP; | |
1261 const TypeInt *ti = t->is_int(); | |
1262 if( !ti->is_con() ) return bottom_type(); | |
1263 JavaValue v; | |
1264 v.set_jint(ti->get_con()); | |
1265 return TypeF::make( v.get_jfloat() ); | |
1266 } | |
1267 | |
1268 //------------------------------Value------------------------------------------ | |
1269 const Type *MoveF2INode::Value( PhaseTransform *phase ) const { | |
1270 const Type *t = phase->type( in(1) ); | |
1271 if( t == Type::TOP ) return Type::TOP; | |
1272 if( t == Type::FLOAT ) return TypeInt::INT; | |
1273 const TypeF *tf = t->is_float_constant(); | |
1274 JavaValue v; | |
1275 v.set_jfloat(tf->getf()); | |
1276 return TypeInt::make( v.get_jint() ); | |
1277 } | |
1278 | |
1279 //------------------------------Value------------------------------------------ | |
1280 const Type *MoveD2LNode::Value( PhaseTransform *phase ) const { | |
1281 const Type *t = phase->type( in(1) ); | |
1282 if( t == Type::TOP ) return Type::TOP; | |
1283 if( t == Type::DOUBLE ) return TypeLong::LONG; | |
1284 const TypeD *td = t->is_double_constant(); | |
1285 JavaValue v; | |
1286 v.set_jdouble(td->getd()); | |
1287 return TypeLong::make( v.get_jlong() ); | |
1288 } | |
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1289 |
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1290 //------------------------------Value------------------------------------------ |
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1291 const Type* CountLeadingZerosINode::Value(PhaseTransform* phase) const { |
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1292 const Type* t = phase->type(in(1)); |
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1293 if (t == Type::TOP) return Type::TOP; |
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1294 const TypeInt* ti = t->isa_int(); |
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1295 if (ti && ti->is_con()) { |
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1296 jint i = ti->get_con(); |
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1297 // HD, Figure 5-6 |
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1298 if (i == 0) |
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1299 return TypeInt::make(BitsPerInt); |
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1300 int n = 1; |
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1301 unsigned int x = i; |
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1302 if (x >> 16 == 0) { n += 16; x <<= 16; } |
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1303 if (x >> 24 == 0) { n += 8; x <<= 8; } |
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1304 if (x >> 28 == 0) { n += 4; x <<= 4; } |
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1305 if (x >> 30 == 0) { n += 2; x <<= 2; } |
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1306 n -= x >> 31; |
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1307 return TypeInt::make(n); |
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1308 } |
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1309 return TypeInt::INT; |
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1310 } |
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1311 |
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1312 //------------------------------Value------------------------------------------ |
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1313 const Type* CountLeadingZerosLNode::Value(PhaseTransform* phase) const { |
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1314 const Type* t = phase->type(in(1)); |
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1315 if (t == Type::TOP) return Type::TOP; |
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1316 const TypeLong* tl = t->isa_long(); |
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1317 if (tl && tl->is_con()) { |
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1318 jlong l = tl->get_con(); |
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1319 // HD, Figure 5-6 |
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1320 if (l == 0) |
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1321 return TypeInt::make(BitsPerLong); |
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1322 int n = 1; |
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1323 unsigned int x = (((julong) l) >> 32); |
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1324 if (x == 0) { n += 32; x = (int) l; } |
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1325 if (x >> 16 == 0) { n += 16; x <<= 16; } |
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1326 if (x >> 24 == 0) { n += 8; x <<= 8; } |
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1327 if (x >> 28 == 0) { n += 4; x <<= 4; } |
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1328 if (x >> 30 == 0) { n += 2; x <<= 2; } |
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1329 n -= x >> 31; |
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1330 return TypeInt::make(n); |
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1331 } |
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1332 return TypeInt::INT; |
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1333 } |
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1334 |
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1335 //------------------------------Value------------------------------------------ |
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1336 const Type* CountTrailingZerosINode::Value(PhaseTransform* phase) const { |
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1337 const Type* t = phase->type(in(1)); |
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1338 if (t == Type::TOP) return Type::TOP; |
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1339 const TypeInt* ti = t->isa_int(); |
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1340 if (ti && ti->is_con()) { |
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1341 jint i = ti->get_con(); |
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1342 // HD, Figure 5-14 |
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1343 int y; |
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1344 if (i == 0) |
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1345 return TypeInt::make(BitsPerInt); |
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1346 int n = 31; |
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1347 y = i << 16; if (y != 0) { n = n - 16; i = y; } |
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1348 y = i << 8; if (y != 0) { n = n - 8; i = y; } |
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1349 y = i << 4; if (y != 0) { n = n - 4; i = y; } |
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1350 y = i << 2; if (y != 0) { n = n - 2; i = y; } |
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1351 y = i << 1; if (y != 0) { n = n - 1; } |
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1352 return TypeInt::make(n); |
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1353 } |
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1354 return TypeInt::INT; |
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1355 } |
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1356 |
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1357 //------------------------------Value------------------------------------------ |
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1358 const Type* CountTrailingZerosLNode::Value(PhaseTransform* phase) const { |
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1359 const Type* t = phase->type(in(1)); |
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1360 if (t == Type::TOP) return Type::TOP; |
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1361 const TypeLong* tl = t->isa_long(); |
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1362 if (tl && tl->is_con()) { |
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1363 jlong l = tl->get_con(); |
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1364 // HD, Figure 5-14 |
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1365 int x, y; |
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1366 if (l == 0) |
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1367 return TypeInt::make(BitsPerLong); |
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1368 int n = 63; |
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1369 y = (int) l; if (y != 0) { n = n - 32; x = y; } else x = (((julong) l) >> 32); |
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1370 y = x << 16; if (y != 0) { n = n - 16; x = y; } |
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1371 y = x << 8; if (y != 0) { n = n - 8; x = y; } |
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1372 y = x << 4; if (y != 0) { n = n - 4; x = y; } |
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1373 y = x << 2; if (y != 0) { n = n - 2; x = y; } |
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1374 y = x << 1; if (y != 0) { n = n - 1; } |
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1375 return TypeInt::make(n); |
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1376 } |
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1377 return TypeInt::INT; |
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1378 } |