Mercurial > hg > truffle
annotate src/share/vm/opto/connode.cpp @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children | 52b4284cb496 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17524 | 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; | |
| 14909 | 191 return phase->type(in(IfFalse))->meet(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 ) { | |
| 14909 | 395 return phase->type(in(1))->higher_equal(_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; | |
| 14909 | 402 const Type* ft = phase->type(in(1))->filter(_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"); | |
| 14909 | 412 const Type* rt = t1->join(_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"); |
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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 } |