Mercurial > hg > truffle
annotate src/share/vm/opto/connode.cpp @ 1575:3657cb01ffc5
6954029: Improve implicit null check generation with compressed oops
Summary: Hoist DecodeN instruction above null check
Reviewed-by: never, twisti
| author | kvn |
|---|---|
| date | Wed, 02 Jun 2010 09:49:32 -0700 |
| parents | ddd6f1182ae3 |
| children | e9ff18c4ace7 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 844 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 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); | |
|
995
ddd6f1182ae3
6883468: C2 compiler enters infinite loop in PhaseIterGVN::transform
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1088 // Avoid ideal transformations ping-pong between this and AddP for raw pointers. |
|
ddd6f1182ae3
6883468: C2 compiler enters infinite loop in PhaseIterGVN::transform
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|
1089 if (phase->find_intptr_t_con(x, -1) == 0) |
|
ddd6f1182ae3
6883468: C2 compiler enters infinite loop in PhaseIterGVN::transform
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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 } |