Mercurial > hg > truffle
annotate src/share/vm/opto/connode.cpp @ 20680:5b8e0f84f00f
8054478: C2: Incorrectly compiled char[] array access crashes JVM
Summary: dead backbranch in main loop results in erroneous array access
Reviewed-by: kvn, iveresov
| author | roland |
|---|---|
| date | Mon, 01 Dec 2014 22:27:00 +0100 |
| parents | de95063c0e34 |
| children | d9e22e15d3f6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "memory/allocation.inline.hpp" | |
| 27 #include "opto/addnode.hpp" | |
| 28 #include "opto/compile.hpp" | |
| 29 #include "opto/connode.hpp" | |
| 30 #include "opto/machnode.hpp" | |
| 31 #include "opto/matcher.hpp" | |
| 32 #include "opto/memnode.hpp" | |
| 33 #include "opto/phaseX.hpp" | |
| 34 #include "opto/subnode.hpp" | |
| 35 #include "runtime/sharedRuntime.hpp" | |
| 0 | 36 |
| 1972 | 37 // Optimization - Graph Style |
| 0 | 38 |
| 39 //============================================================================= | |
| 40 //------------------------------hash------------------------------------------- | |
| 41 uint ConNode::hash() const { | |
| 42 return (uintptr_t)in(TypeFunc::Control) + _type->hash(); | |
| 43 } | |
| 44 | |
| 45 //------------------------------make------------------------------------------- | |
| 46 ConNode *ConNode::make( Compile* C, const Type *t ) { | |
| 47 switch( t->basic_type() ) { | |
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48 case T_INT: return new (C) ConINode( t->is_int() ); |
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49 case T_LONG: return new (C) ConLNode( t->is_long() ); |
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50 case T_FLOAT: return new (C) ConFNode( t->is_float_constant() ); |
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51 case T_DOUBLE: return new (C) ConDNode( t->is_double_constant() ); |
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52 case T_VOID: return new (C) ConNode ( Type::TOP ); |
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53 case T_OBJECT: return new (C) ConPNode( t->is_ptr() ); |
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54 case T_ARRAY: return new (C) ConPNode( t->is_aryptr() ); |
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55 case T_ADDRESS: return new (C) ConPNode( t->is_ptr() ); |
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56 case T_NARROWOOP: return new (C) ConNNode( t->is_narrowoop() ); |
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57 case T_NARROWKLASS: return new (C) ConNKlassNode( t->is_narrowklass() ); |
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58 case T_METADATA: return new (C) ConPNode( t->is_ptr() ); |
| 0 | 59 // Expected cases: TypePtr::NULL_PTR, any is_rawptr() |
| 60 // Also seen: AnyPtr(TopPTR *+top); from command line: | |
| 61 // r -XX:+PrintOpto -XX:CIStart=285 -XX:+CompileTheWorld -XX:CompileTheWorldStartAt=660 | |
| 62 // %%%% Stop using TypePtr::NULL_PTR to represent nulls: use either TypeRawPtr::NULL_PTR | |
| 63 // or else TypeOopPtr::NULL_PTR. Then set Type::_basic_type[AnyPtr] = T_ILLEGAL | |
| 64 } | |
| 65 ShouldNotReachHere(); | |
| 66 return NULL; | |
| 67 } | |
| 68 | |
| 69 //============================================================================= | |
| 70 /* | |
| 71 The major change is for CMoveP and StrComp. They have related but slightly | |
| 72 different problems. They both take in TWO oops which are both null-checked | |
| 73 independently before the using Node. After CCP removes the CastPP's they need | |
| 74 to pick up the guarding test edge - in this case TWO control edges. I tried | |
| 75 various solutions, all have problems: | |
| 76 | |
| 77 (1) Do nothing. This leads to a bug where we hoist a Load from a CMoveP or a | |
| 78 StrComp above a guarding null check. I've seen both cases in normal -Xcomp | |
| 79 testing. | |
| 80 | |
| 81 (2) Plug the control edge from 1 of the 2 oops in. Apparent problem here is | |
| 82 to figure out which test post-dominates. The real problem is that it doesn't | |
| 83 matter which one you pick. After you pick up, the dominating-test elider in | |
| 84 IGVN can remove the test and allow you to hoist up to the dominating test on | |
| 605 | 85 the chosen oop bypassing the test on the not-chosen oop. Seen in testing. |
| 0 | 86 Oops. |
| 87 | |
| 88 (3) Leave the CastPP's in. This makes the graph more accurate in some sense; | |
| 89 we get to keep around the knowledge that an oop is not-null after some test. | |
| 90 Alas, the CastPP's interfere with GVN (some values are the regular oop, some | |
| 91 are the CastPP of the oop, all merge at Phi's which cannot collapse, etc). | |
| 92 This cost us 10% on SpecJVM, even when I removed some of the more trivial | |
| 93 cases in the optimizer. Removing more useless Phi's started allowing Loads to | |
| 94 illegally float above null checks. I gave up on this approach. | |
| 95 | |
| 96 (4) Add BOTH control edges to both tests. Alas, too much code knows that | |
| 97 control edges are in slot-zero ONLY. Many quick asserts fail; no way to do | |
| 98 this one. Note that I really want to allow the CMoveP to float and add both | |
| 99 control edges to the dependent Load op - meaning I can select early but I | |
| 100 cannot Load until I pass both tests. | |
| 101 | |
| 102 (5) Do not hoist CMoveP and StrComp. To this end I added the v-call | |
| 103 depends_only_on_test(). No obvious performance loss on Spec, but we are | |
| 104 clearly conservative on CMoveP (also so on StrComp but that's unlikely to | |
| 105 matter ever). | |
| 106 | |
| 107 */ | |
| 108 | |
| 109 | |
| 110 //------------------------------Ideal------------------------------------------ | |
| 111 // Return a node which is more "ideal" than the current node. | |
| 112 // Move constants to the right. | |
| 113 Node *CMoveNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 114 if( in(0) && remove_dead_region(phase, can_reshape) ) return this; | |
| 305 | 115 // Don't bother trying to transform a dead node |
| 116 if( in(0) && in(0)->is_top() ) return NULL; | |
| 0 | 117 assert( !phase->eqv(in(Condition), this) && |
| 118 !phase->eqv(in(IfFalse), this) && | |
| 119 !phase->eqv(in(IfTrue), this), "dead loop in CMoveNode::Ideal" ); | |
| 120 if( phase->type(in(Condition)) == Type::TOP ) | |
| 121 return NULL; // return NULL when Condition is dead | |
| 122 | |
| 123 if( in(IfFalse)->is_Con() && !in(IfTrue)->is_Con() ) { | |
| 124 if( in(Condition)->is_Bool() ) { | |
| 125 BoolNode* b = in(Condition)->as_Bool(); | |
| 126 BoolNode* b2 = b->negate(phase); | |
| 127 return make( phase->C, in(Control), phase->transform(b2), in(IfTrue), in(IfFalse), _type ); | |
| 128 } | |
| 129 } | |
| 130 return NULL; | |
| 131 } | |
| 132 | |
| 133 //------------------------------is_cmove_id------------------------------------ | |
| 134 // Helper function to check for CMOVE identity. Shared with PhiNode::Identity | |
| 135 Node *CMoveNode::is_cmove_id( PhaseTransform *phase, Node *cmp, Node *t, Node *f, BoolNode *b ) { | |
| 136 // Check for Cmp'ing and CMove'ing same values | |
| 137 if( (phase->eqv(cmp->in(1),f) && | |
| 138 phase->eqv(cmp->in(2),t)) || | |
| 139 // Swapped Cmp is OK | |
| 140 (phase->eqv(cmp->in(2),f) && | |
| 141 phase->eqv(cmp->in(1),t)) ) { | |
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142 // Give up this identity check for floating points because it may choose incorrect |
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143 // value around 0.0 and -0.0 |
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144 if ( cmp->Opcode()==Op_CmpF || cmp->Opcode()==Op_CmpD ) |
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145 return NULL; |
| 0 | 146 // Check for "(t==f)?t:f;" and replace with "f" |
| 147 if( b->_test._test == BoolTest::eq ) | |
| 148 return f; | |
| 149 // Allow the inverted case as well | |
| 150 // Check for "(t!=f)?t:f;" and replace with "t" | |
| 151 if( b->_test._test == BoolTest::ne ) | |
| 152 return t; | |
| 153 } | |
| 154 return NULL; | |
| 155 } | |
| 156 | |
| 157 //------------------------------Identity--------------------------------------- | |
| 158 // Conditional-move is an identity if both inputs are the same, or the test | |
| 159 // true or false. | |
| 160 Node *CMoveNode::Identity( PhaseTransform *phase ) { | |
| 161 if( phase->eqv(in(IfFalse),in(IfTrue)) ) // C-moving identical inputs? | |
| 162 return in(IfFalse); // Then it doesn't matter | |
| 163 if( phase->type(in(Condition)) == TypeInt::ZERO ) | |
| 164 return in(IfFalse); // Always pick left(false) input | |
| 165 if( phase->type(in(Condition)) == TypeInt::ONE ) | |
| 166 return in(IfTrue); // Always pick right(true) input | |
| 167 | |
| 168 // Check for CMove'ing a constant after comparing against the constant. | |
| 169 // Happens all the time now, since if we compare equality vs a constant in | |
| 170 // the parser, we "know" the variable is constant on one path and we force | |
| 171 // it. Thus code like "if( x==0 ) {/*EMPTY*/}" ends up inserting a | |
| 172 // conditional move: "x = (x==0)?0:x;". Yucko. This fix is slightly more | |
| 173 // general in that we don't need constants. | |
| 174 if( in(Condition)->is_Bool() ) { | |
| 175 BoolNode *b = in(Condition)->as_Bool(); | |
| 176 Node *cmp = b->in(1); | |
| 177 if( cmp->is_Cmp() ) { | |
| 178 Node *id = is_cmove_id( phase, cmp, in(IfTrue), in(IfFalse), b ); | |
| 179 if( id ) return id; | |
| 180 } | |
| 181 } | |
| 182 | |
| 183 return this; | |
| 184 } | |
| 185 | |
| 186 //------------------------------Value------------------------------------------ | |
| 187 // Result is the meet of inputs | |
| 188 const Type *CMoveNode::Value( PhaseTransform *phase ) const { | |
| 189 if( phase->type(in(Condition)) == Type::TOP ) | |
| 190 return Type::TOP; | |
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191 return phase->type(in(IfFalse))->meet_speculative(phase->type(in(IfTrue))); |
| 0 | 192 } |
| 193 | |
| 194 //------------------------------make------------------------------------------- | |
| 195 // Make a correctly-flavored CMove. Since _type is directly determined | |
| 196 // from the inputs we do not need to specify it here. | |
| 197 CMoveNode *CMoveNode::make( Compile *C, Node *c, Node *bol, Node *left, Node *right, const Type *t ) { | |
| 198 switch( t->basic_type() ) { | |
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199 case T_INT: return new (C) CMoveINode( bol, left, right, t->is_int() ); |
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200 case T_FLOAT: return new (C) CMoveFNode( bol, left, right, t ); |
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201 case T_DOUBLE: return new (C) CMoveDNode( bol, left, right, t ); |
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202 case T_LONG: return new (C) CMoveLNode( bol, left, right, t->is_long() ); |
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203 case T_OBJECT: return new (C) CMovePNode( c, bol, left, right, t->is_oopptr() ); |
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204 case T_ADDRESS: return new (C) CMovePNode( c, bol, left, right, t->is_ptr() ); |
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205 case T_NARROWOOP: return new (C) CMoveNNode( c, bol, left, right, t ); |
| 0 | 206 default: |
| 207 ShouldNotReachHere(); | |
| 208 return NULL; | |
| 209 } | |
| 210 } | |
| 211 | |
| 212 //============================================================================= | |
| 213 //------------------------------Ideal------------------------------------------ | |
| 214 // Return a node which is more "ideal" than the current node. | |
| 215 // Check for conversions to boolean | |
| 216 Node *CMoveINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 217 // Try generic ideal's first | |
| 218 Node *x = CMoveNode::Ideal(phase, can_reshape); | |
| 219 if( x ) return x; | |
| 220 | |
| 221 // If zero is on the left (false-case, no-move-case) it must mean another | |
| 222 // constant is on the right (otherwise the shared CMove::Ideal code would | |
| 223 // have moved the constant to the right). This situation is bad for Intel | |
| 224 // and a don't-care for Sparc. It's bad for Intel because the zero has to | |
| 225 // be manifested in a register with a XOR which kills flags, which are live | |
| 226 // on input to the CMoveI, leading to a situation which causes excessive | |
| 227 // spilling on Intel. For Sparc, if the zero in on the left the Sparc will | |
| 228 // zero a register via G0 and conditionally-move the other constant. If the | |
| 229 // zero is on the right, the Sparc will load the first constant with a | |
| 230 // 13-bit set-lo and conditionally move G0. See bug 4677505. | |
| 231 if( phase->type(in(IfFalse)) == TypeInt::ZERO && !(phase->type(in(IfTrue)) == TypeInt::ZERO) ) { | |
| 232 if( in(Condition)->is_Bool() ) { | |
| 233 BoolNode* b = in(Condition)->as_Bool(); | |
| 234 BoolNode* b2 = b->negate(phase); | |
| 235 return make( phase->C, in(Control), phase->transform(b2), in(IfTrue), in(IfFalse), _type ); | |
| 236 } | |
| 237 } | |
| 238 | |
| 239 // Now check for booleans | |
| 240 int flip = 0; | |
| 241 | |
| 242 // Check for picking from zero/one | |
| 243 if( phase->type(in(IfFalse)) == TypeInt::ZERO && phase->type(in(IfTrue)) == TypeInt::ONE ) { | |
| 244 flip = 1 - flip; | |
| 245 } else if( phase->type(in(IfFalse)) == TypeInt::ONE && phase->type(in(IfTrue)) == TypeInt::ZERO ) { | |
| 246 } else return NULL; | |
| 247 | |
| 248 // Check for eq/ne test | |
| 249 if( !in(1)->is_Bool() ) return NULL; | |
| 250 BoolNode *bol = in(1)->as_Bool(); | |
| 251 if( bol->_test._test == BoolTest::eq ) { | |
| 252 } else if( bol->_test._test == BoolTest::ne ) { | |
| 253 flip = 1-flip; | |
| 254 } else return NULL; | |
| 255 | |
| 256 // Check for vs 0 or 1 | |
| 257 if( !bol->in(1)->is_Cmp() ) return NULL; | |
| 258 const CmpNode *cmp = bol->in(1)->as_Cmp(); | |
| 259 if( phase->type(cmp->in(2)) == TypeInt::ZERO ) { | |
| 260 } else if( phase->type(cmp->in(2)) == TypeInt::ONE ) { | |
| 261 // Allow cmp-vs-1 if the other input is bounded by 0-1 | |
| 262 if( phase->type(cmp->in(1)) != TypeInt::BOOL ) | |
| 263 return NULL; | |
| 264 flip = 1 - flip; | |
| 265 } else return NULL; | |
| 266 | |
| 267 // Convert to a bool (flipped) | |
| 268 // Build int->bool conversion | |
| 269 #ifndef PRODUCT | |
| 270 if( PrintOpto ) tty->print_cr("CMOV to I2B"); | |
| 271 #endif | |
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272 Node *n = new (phase->C) Conv2BNode( cmp->in(1) ); |
| 0 | 273 if( flip ) |
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274 n = new (phase->C) XorINode( phase->transform(n), phase->intcon(1) ); |
| 0 | 275 |
| 276 return n; | |
| 277 } | |
| 278 | |
| 279 //============================================================================= | |
| 280 //------------------------------Ideal------------------------------------------ | |
| 281 // Return a node which is more "ideal" than the current node. | |
| 282 // Check for absolute value | |
| 283 Node *CMoveFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 284 // Try generic ideal's first | |
| 285 Node *x = CMoveNode::Ideal(phase, can_reshape); | |
| 286 if( x ) return x; | |
| 287 | |
| 288 int cmp_zero_idx = 0; // Index of compare input where to look for zero | |
| 289 int phi_x_idx = 0; // Index of phi input where to find naked x | |
| 290 | |
| 291 // Find the Bool | |
| 292 if( !in(1)->is_Bool() ) return NULL; | |
| 293 BoolNode *bol = in(1)->as_Bool(); | |
| 294 // Check bool sense | |
| 295 switch( bol->_test._test ) { | |
| 296 case BoolTest::lt: cmp_zero_idx = 1; phi_x_idx = IfTrue; break; | |
| 297 case BoolTest::le: cmp_zero_idx = 2; phi_x_idx = IfFalse; break; | |
| 298 case BoolTest::gt: cmp_zero_idx = 2; phi_x_idx = IfTrue; break; | |
| 299 case BoolTest::ge: cmp_zero_idx = 1; phi_x_idx = IfFalse; break; | |
| 300 default: return NULL; break; | |
| 301 } | |
| 302 | |
| 303 // Find zero input of CmpF; the other input is being abs'd | |
| 304 Node *cmpf = bol->in(1); | |
| 305 if( cmpf->Opcode() != Op_CmpF ) return NULL; | |
| 306 Node *X = NULL; | |
| 307 bool flip = false; | |
| 308 if( phase->type(cmpf->in(cmp_zero_idx)) == TypeF::ZERO ) { | |
| 309 X = cmpf->in(3 - cmp_zero_idx); | |
| 310 } else if (phase->type(cmpf->in(3 - cmp_zero_idx)) == TypeF::ZERO) { | |
| 311 // The test is inverted, we should invert the result... | |
| 312 X = cmpf->in(cmp_zero_idx); | |
| 313 flip = true; | |
| 314 } else { | |
| 315 return NULL; | |
| 316 } | |
| 317 | |
| 318 // If X is found on the appropriate phi input, find the subtract on the other | |
| 319 if( X != in(phi_x_idx) ) return NULL; | |
| 320 int phi_sub_idx = phi_x_idx == IfTrue ? IfFalse : IfTrue; | |
| 321 Node *sub = in(phi_sub_idx); | |
| 322 | |
| 323 // Allow only SubF(0,X) and fail out for all others; NegF is not OK | |
| 324 if( sub->Opcode() != Op_SubF || | |
| 325 sub->in(2) != X || | |
| 326 phase->type(sub->in(1)) != TypeF::ZERO ) return NULL; | |
| 327 | |
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328 Node *abs = new (phase->C) AbsFNode( X ); |
| 0 | 329 if( flip ) |
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330 abs = new (phase->C) SubFNode(sub->in(1), phase->transform(abs)); |
| 0 | 331 |
| 332 return abs; | |
| 333 } | |
| 334 | |
| 335 //============================================================================= | |
| 336 //------------------------------Ideal------------------------------------------ | |
| 337 // Return a node which is more "ideal" than the current node. | |
| 338 // Check for absolute value | |
| 339 Node *CMoveDNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 340 // Try generic ideal's first | |
| 341 Node *x = CMoveNode::Ideal(phase, can_reshape); | |
| 342 if( x ) return x; | |
| 343 | |
| 344 int cmp_zero_idx = 0; // Index of compare input where to look for zero | |
| 345 int phi_x_idx = 0; // Index of phi input where to find naked x | |
| 346 | |
| 347 // Find the Bool | |
| 348 if( !in(1)->is_Bool() ) return NULL; | |
| 349 BoolNode *bol = in(1)->as_Bool(); | |
| 350 // Check bool sense | |
| 351 switch( bol->_test._test ) { | |
| 352 case BoolTest::lt: cmp_zero_idx = 1; phi_x_idx = IfTrue; break; | |
| 353 case BoolTest::le: cmp_zero_idx = 2; phi_x_idx = IfFalse; break; | |
| 354 case BoolTest::gt: cmp_zero_idx = 2; phi_x_idx = IfTrue; break; | |
| 355 case BoolTest::ge: cmp_zero_idx = 1; phi_x_idx = IfFalse; break; | |
| 356 default: return NULL; break; | |
| 357 } | |
| 358 | |
| 359 // Find zero input of CmpD; the other input is being abs'd | |
| 360 Node *cmpd = bol->in(1); | |
| 361 if( cmpd->Opcode() != Op_CmpD ) return NULL; | |
| 362 Node *X = NULL; | |
| 363 bool flip = false; | |
| 364 if( phase->type(cmpd->in(cmp_zero_idx)) == TypeD::ZERO ) { | |
| 365 X = cmpd->in(3 - cmp_zero_idx); | |
| 366 } else if (phase->type(cmpd->in(3 - cmp_zero_idx)) == TypeD::ZERO) { | |
| 367 // The test is inverted, we should invert the result... | |
| 368 X = cmpd->in(cmp_zero_idx); | |
| 369 flip = true; | |
| 370 } else { | |
| 371 return NULL; | |
| 372 } | |
| 373 | |
| 374 // If X is found on the appropriate phi input, find the subtract on the other | |
| 375 if( X != in(phi_x_idx) ) return NULL; | |
| 376 int phi_sub_idx = phi_x_idx == IfTrue ? IfFalse : IfTrue; | |
| 377 Node *sub = in(phi_sub_idx); | |
| 378 | |
| 379 // Allow only SubD(0,X) and fail out for all others; NegD is not OK | |
| 380 if( sub->Opcode() != Op_SubD || | |
| 381 sub->in(2) != X || | |
| 382 phase->type(sub->in(1)) != TypeD::ZERO ) return NULL; | |
| 383 | |
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384 Node *abs = new (phase->C) AbsDNode( X ); |
| 0 | 385 if( flip ) |
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386 abs = new (phase->C) SubDNode(sub->in(1), phase->transform(abs)); |
| 0 | 387 |
| 388 return abs; | |
| 389 } | |
| 390 | |
| 391 | |
| 392 //============================================================================= | |
| 393 // If input is already higher or equal to cast type, then this is an identity. | |
| 394 Node *ConstraintCastNode::Identity( PhaseTransform *phase ) { | |
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395 return phase->type(in(1))->higher_equal_speculative(_type) ? in(1) : this; |
| 0 | 396 } |
| 397 | |
| 398 //------------------------------Value------------------------------------------ | |
| 399 // Take 'join' of input and cast-up type | |
| 400 const Type *ConstraintCastNode::Value( PhaseTransform *phase ) const { | |
| 401 if( in(0) && phase->type(in(0)) == Type::TOP ) return Type::TOP; | |
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402 const Type* ft = phase->type(in(1))->filter_speculative(_type); |
| 0 | 403 |
| 404 #ifdef ASSERT | |
| 405 // Previous versions of this function had some special case logic, | |
| 406 // which is no longer necessary. Make sure of the required effects. | |
| 407 switch (Opcode()) { | |
| 408 case Op_CastII: | |
| 409 { | |
| 410 const Type* t1 = phase->type(in(1)); | |
| 411 if( t1 == Type::TOP ) assert(ft == Type::TOP, "special case #1"); | |
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412 const Type* rt = t1->join_speculative(_type); |
| 0 | 413 if (rt->empty()) assert(ft == Type::TOP, "special case #2"); |
| 414 break; | |
| 415 } | |
| 416 case Op_CastPP: | |
| 417 if (phase->type(in(1)) == TypePtr::NULL_PTR && | |
| 418 _type->isa_ptr() && _type->is_ptr()->_ptr == TypePtr::NotNull) | |
| 419 assert(ft == Type::TOP, "special case #3"); | |
| 420 break; | |
| 421 } | |
| 422 #endif //ASSERT | |
| 423 | |
| 424 return ft; | |
| 425 } | |
| 426 | |
| 427 //------------------------------Ideal------------------------------------------ | |
| 428 // Return a node which is more "ideal" than the current node. Strip out | |
| 429 // control copies | |
| 430 Node *ConstraintCastNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
| 431 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; | |
| 432 } | |
| 433 | |
| 434 //------------------------------Ideal_DU_postCCP------------------------------- | |
| 435 // Throw away cast after constant propagation | |
| 436 Node *ConstraintCastNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { | |
| 437 const Type *t = ccp->type(in(1)); | |
| 438 ccp->hash_delete(this); | |
| 439 set_type(t); // Turn into ID function | |
| 440 ccp->hash_insert(this); | |
| 441 return this; | |
| 442 } | |
| 443 | |
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444 uint CastIINode::size_of() const { |
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445 return sizeof(*this); |
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446 } |
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447 |
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448 uint CastIINode::cmp(const Node &n) const { |
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449 return TypeNode::cmp(n) && ((CastIINode&)n)._carry_dependency == _carry_dependency; |
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450 } |
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451 |
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452 Node *CastIINode::Identity(PhaseTransform *phase) { |
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453 if (_carry_dependency) { |
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454 return this; |
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455 } |
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456 return ConstraintCastNode::Identity(phase); |
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457 } |
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458 |
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459 const Type *CastIINode::Value(PhaseTransform *phase) const { |
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460 const Type *res = ConstraintCastNode::Value(phase); |
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461 |
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462 // Try to improve the type of the CastII if we recognize a CmpI/If |
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463 // pattern. |
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464 if (_carry_dependency) { |
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465 if (in(0) != NULL && (in(0)->is_IfFalse() || in(0)->is_IfTrue())) { |
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466 Node* proj = in(0); |
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467 if (proj->in(0)->in(1)->is_Bool()) { |
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468 Node* b = proj->in(0)->in(1); |
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469 if (b->in(1)->Opcode() == Op_CmpI) { |
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470 Node* cmp = b->in(1); |
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471 if (cmp->in(1) == in(1) && phase->type(cmp->in(2))->isa_int()) { |
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472 const TypeInt* in2_t = phase->type(cmp->in(2))->is_int(); |
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473 const Type* t = TypeInt::INT; |
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474 BoolTest test = b->as_Bool()->_test; |
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475 if (proj->is_IfFalse()) { |
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476 test = test.negate(); |
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477 } |
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478 BoolTest::mask m = test._test; |
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479 jlong lo_long = min_jint; |
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480 jlong hi_long = max_jint; |
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481 if (m == BoolTest::le || m == BoolTest::lt) { |
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482 hi_long = in2_t->_hi; |
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483 if (m == BoolTest::lt) { |
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484 hi_long -= 1; |
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485 } |
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486 } else if (m == BoolTest::ge || m == BoolTest::gt) { |
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487 lo_long = in2_t->_lo; |
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488 if (m == BoolTest::gt) { |
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489 lo_long += 1; |
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490 } |
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491 } else if (m == BoolTest::eq) { |
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492 lo_long = in2_t->_lo; |
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493 hi_long = in2_t->_hi; |
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494 } else if (m == BoolTest::ne) { |
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495 // can't do any better |
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496 } else { |
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497 stringStream ss; |
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498 test.dump_on(&ss); |
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499 fatal(err_msg_res("unexpected comparison %s", ss.as_string())); |
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500 } |
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501 int lo_int = (int)lo_long; |
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502 int hi_int = (int)hi_long; |
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503 |
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504 if (lo_long != (jlong)lo_int) { |
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505 lo_int = min_jint; |
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506 } |
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507 if (hi_long != (jlong)hi_int) { |
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508 hi_int = max_jint; |
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509 } |
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510 |
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511 t = TypeInt::make(lo_int, hi_int, Type::WidenMax); |
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512 |
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513 res = res->filter_speculative(t); |
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514 |
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515 return res; |
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516 } |
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517 } |
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518 } |
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519 } |
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520 } |
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521 return res; |
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522 } |
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523 |
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524 Node *CastIINode::Ideal_DU_postCCP(PhaseCCP *ccp) { |
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525 if (_carry_dependency) { |
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526 return NULL; |
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527 } |
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528 return ConstraintCastNode::Ideal_DU_postCCP(ccp); |
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529 } |
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530 |
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531 #ifndef PRODUCT |
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532 void CastIINode::dump_spec(outputStream *st) const { |
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533 TypeNode::dump_spec(st); |
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534 if (_carry_dependency) { |
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535 st->print(" carry dependency"); |
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536 } |
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537 } |
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538 #endif |
| 0 | 539 |
| 540 //============================================================================= | |
| 541 | |
| 542 //------------------------------Ideal_DU_postCCP------------------------------- | |
| 543 // If not converting int->oop, throw away cast after constant propagation | |
| 544 Node *CastPPNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { | |
| 545 const Type *t = ccp->type(in(1)); | |
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546 if (!t->isa_oop_ptr() || ((in(1)->is_DecodeN()) && Matcher::gen_narrow_oop_implicit_null_checks())) { |
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547 return NULL; // do not transform raw pointers or narrow oops |
| 0 | 548 } |
| 549 return ConstraintCastNode::Ideal_DU_postCCP(ccp); | |
| 550 } | |
| 551 | |
| 552 | |
| 553 | |
| 554 //============================================================================= | |
| 555 //------------------------------Identity--------------------------------------- | |
| 556 // If input is already higher or equal to cast type, then this is an identity. | |
| 557 Node *CheckCastPPNode::Identity( PhaseTransform *phase ) { | |
| 558 // Toned down to rescue meeting at a Phi 3 different oops all implementing | |
| 559 // the same interface. CompileTheWorld starting at 502, kd12rc1.zip. | |
| 560 return (phase->type(in(1)) == phase->type(this)) ? in(1) : this; | |
| 561 } | |
| 562 | |
| 563 //------------------------------Value------------------------------------------ | |
| 564 // Take 'join' of input and cast-up type, unless working with an Interface | |
| 565 const Type *CheckCastPPNode::Value( PhaseTransform *phase ) const { | |
| 566 if( in(0) && phase->type(in(0)) == Type::TOP ) return Type::TOP; | |
| 567 | |
| 568 const Type *inn = phase->type(in(1)); | |
| 569 if( inn == Type::TOP ) return Type::TOP; // No information yet | |
| 570 | |
| 571 const TypePtr *in_type = inn->isa_ptr(); | |
| 572 const TypePtr *my_type = _type->isa_ptr(); | |
| 573 const Type *result = _type; | |
| 574 if( in_type != NULL && my_type != NULL ) { | |
| 575 TypePtr::PTR in_ptr = in_type->ptr(); | |
| 576 if( in_ptr == TypePtr::Null ) { | |
| 577 result = in_type; | |
| 578 } else if( in_ptr == TypePtr::Constant ) { | |
| 579 // Casting a constant oop to an interface? | |
| 580 // (i.e., a String to a Comparable?) | |
| 581 // Then return the interface. | |
| 582 const TypeOopPtr *jptr = my_type->isa_oopptr(); | |
| 583 assert( jptr, "" ); | |
| 584 result = (jptr->klass()->is_interface() || !in_type->higher_equal(_type)) | |
| 585 ? my_type->cast_to_ptr_type( TypePtr::NotNull ) | |
| 586 : in_type; | |
| 587 } else { | |
| 588 result = my_type->cast_to_ptr_type( my_type->join_ptr(in_ptr) ); | |
| 589 } | |
| 590 } | |
| 591 return result; | |
| 592 | |
| 593 // JOIN NOT DONE HERE BECAUSE OF INTERFACE ISSUES. | |
| 594 // FIX THIS (DO THE JOIN) WHEN UNION TYPES APPEAR! | |
| 595 | |
| 596 // | |
| 597 // Remove this code after overnight run indicates no performance | |
| 598 // loss from not performing JOIN at CheckCastPPNode | |
| 599 // | |
| 600 // const TypeInstPtr *in_oop = in->isa_instptr(); | |
| 601 // const TypeInstPtr *my_oop = _type->isa_instptr(); | |
| 602 // // If either input is an 'interface', return destination type | |
| 603 // assert (in_oop == NULL || in_oop->klass() != NULL, ""); | |
| 604 // assert (my_oop == NULL || my_oop->klass() != NULL, ""); | |
|
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605 // if( (in_oop && in_oop->klass()->is_interface()) |
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606 // ||(my_oop && my_oop->klass()->is_interface()) ) { |
| 0 | 607 // TypePtr::PTR in_ptr = in->isa_ptr() ? in->is_ptr()->_ptr : TypePtr::BotPTR; |
| 608 // // Preserve cast away nullness for interfaces | |
| 609 // if( in_ptr == TypePtr::NotNull && my_oop && my_oop->_ptr == TypePtr::BotPTR ) { | |
| 610 // return my_oop->cast_to_ptr_type(TypePtr::NotNull); | |
| 611 // } | |
| 612 // return _type; | |
| 613 // } | |
| 614 // | |
| 615 // // Neither the input nor the destination type is an interface, | |
| 616 // | |
| 617 // // history: JOIN used to cause weird corner case bugs | |
| 618 // // return (in == TypeOopPtr::NULL_PTR) ? in : _type; | |
| 619 // // JOIN picks up NotNull in common instance-of/check-cast idioms, both oops. | |
| 620 // // JOIN does not preserve NotNull in other cases, e.g. RawPtr vs InstPtr | |
| 621 // const Type *join = in->join(_type); | |
| 622 // // Check if join preserved NotNull'ness for pointers | |
| 623 // if( join->isa_ptr() && _type->isa_ptr() ) { | |
| 624 // TypePtr::PTR join_ptr = join->is_ptr()->_ptr; | |
| 625 // TypePtr::PTR type_ptr = _type->is_ptr()->_ptr; | |
| 626 // // If there isn't any NotNull'ness to preserve | |
| 627 // // OR if join preserved NotNull'ness then return it | |
| 628 // if( type_ptr == TypePtr::BotPTR || type_ptr == TypePtr::Null || | |
| 629 // join_ptr == TypePtr::NotNull || join_ptr == TypePtr::Constant ) { | |
| 630 // return join; | |
| 631 // } | |
| 632 // // ELSE return same old type as before | |
| 633 // return _type; | |
| 634 // } | |
| 635 // // Not joining two pointers | |
| 636 // return join; | |
| 637 } | |
| 638 | |
| 639 //------------------------------Ideal------------------------------------------ | |
| 640 // Return a node which is more "ideal" than the current node. Strip out | |
| 641 // control copies | |
| 642 Node *CheckCastPPNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
| 643 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; | |
| 644 } | |
| 645 | |
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646 |
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647 Node* DecodeNNode::Identity(PhaseTransform* phase) { |
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648 const Type *t = phase->type( in(1) ); |
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649 if( t == Type::TOP ) return in(1); |
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650 |
|
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651 if (in(1)->is_EncodeP()) { |
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652 // (DecodeN (EncodeP p)) -> p |
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653 return in(1)->in(1); |
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654 } |
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655 return this; |
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656 } |
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657 |
|
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658 const Type *DecodeNNode::Value( PhaseTransform *phase ) const { |
|
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659 const Type *t = phase->type( in(1) ); |
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660 if (t == Type::TOP) return Type::TOP; |
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661 if (t == TypeNarrowOop::NULL_PTR) return TypePtr::NULL_PTR; |
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662 |
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663 assert(t->isa_narrowoop(), "only narrowoop here"); |
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664 return t->make_ptr(); |
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665 } |
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666 |
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667 Node* EncodePNode::Identity(PhaseTransform* phase) { |
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668 const Type *t = phase->type( in(1) ); |
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669 if( t == Type::TOP ) return in(1); |
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670 |
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671 if (in(1)->is_DecodeN()) { |
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672 // (EncodeP (DecodeN p)) -> p |
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673 return in(1)->in(1); |
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674 } |
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675 return this; |
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676 } |
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677 |
|
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678 const Type *EncodePNode::Value( PhaseTransform *phase ) const { |
|
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679 const Type *t = phase->type( in(1) ); |
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680 if (t == Type::TOP) return Type::TOP; |
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681 if (t == TypePtr::NULL_PTR) return TypeNarrowOop::NULL_PTR; |
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682 |
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683 assert(t->isa_oop_ptr(), "only oopptr here"); |
|
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684 return t->make_narrowoop(); |
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685 } |
|
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686 |
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687 |
|
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688 Node *EncodeNarrowPtrNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { |
| 163 | 689 return MemNode::Ideal_common_DU_postCCP(ccp, this, in(1)); |
| 690 } | |
|
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691 |
|
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692 Node* DecodeNKlassNode::Identity(PhaseTransform* phase) { |
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693 const Type *t = phase->type( in(1) ); |
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694 if( t == Type::TOP ) return in(1); |
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695 |
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696 if (in(1)->is_EncodePKlass()) { |
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697 // (DecodeNKlass (EncodePKlass p)) -> p |
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698 return in(1)->in(1); |
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699 } |
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700 return this; |
|
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701 } |
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702 |
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703 const Type *DecodeNKlassNode::Value( PhaseTransform *phase ) const { |
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704 const Type *t = phase->type( in(1) ); |
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705 if (t == Type::TOP) return Type::TOP; |
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706 assert(t != TypeNarrowKlass::NULL_PTR, "null klass?"); |
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707 |
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708 assert(t->isa_narrowklass(), "only narrow klass ptr here"); |
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709 return t->make_ptr(); |
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710 } |
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711 |
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712 Node* EncodePKlassNode::Identity(PhaseTransform* phase) { |
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713 const Type *t = phase->type( in(1) ); |
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714 if( t == Type::TOP ) return in(1); |
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715 |
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716 if (in(1)->is_DecodeNKlass()) { |
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717 // (EncodePKlass (DecodeNKlass p)) -> p |
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718 return in(1)->in(1); |
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719 } |
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720 return this; |
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721 } |
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722 |
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723 const Type *EncodePKlassNode::Value( PhaseTransform *phase ) const { |
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724 const Type *t = phase->type( in(1) ); |
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725 if (t == Type::TOP) return Type::TOP; |
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726 assert (t != TypePtr::NULL_PTR, "null klass?"); |
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727 |
|
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728 assert(UseCompressedClassPointers && t->isa_klassptr(), "only klass ptr here"); |
|
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729 return t->make_narrowklass(); |
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730 } |
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731 |
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732 |
| 0 | 733 //============================================================================= |
| 734 //------------------------------Identity--------------------------------------- | |
| 735 Node *Conv2BNode::Identity( PhaseTransform *phase ) { | |
| 736 const Type *t = phase->type( in(1) ); | |
| 737 if( t == Type::TOP ) return in(1); | |
| 738 if( t == TypeInt::ZERO ) return in(1); | |
| 739 if( t == TypeInt::ONE ) return in(1); | |
| 740 if( t == TypeInt::BOOL ) return in(1); | |
| 741 return this; | |
| 742 } | |
| 743 | |
| 744 //------------------------------Value------------------------------------------ | |
| 745 const Type *Conv2BNode::Value( PhaseTransform *phase ) const { | |
| 746 const Type *t = phase->type( in(1) ); | |
| 747 if( t == Type::TOP ) return Type::TOP; | |
| 748 if( t == TypeInt::ZERO ) return TypeInt::ZERO; | |
| 749 if( t == TypePtr::NULL_PTR ) return TypeInt::ZERO; | |
| 750 const TypePtr *tp = t->isa_ptr(); | |
| 751 if( tp != NULL ) { | |
| 752 if( tp->ptr() == TypePtr::AnyNull ) return Type::TOP; | |
| 753 if( tp->ptr() == TypePtr::Constant) return TypeInt::ONE; | |
| 754 if (tp->ptr() == TypePtr::NotNull) return TypeInt::ONE; | |
| 755 return TypeInt::BOOL; | |
| 756 } | |
| 757 if (t->base() != Type::Int) return TypeInt::BOOL; | |
| 758 const TypeInt *ti = t->is_int(); | |
| 759 if( ti->_hi < 0 || ti->_lo > 0 ) return TypeInt::ONE; | |
| 760 return TypeInt::BOOL; | |
| 761 } | |
| 762 | |
| 763 | |
| 764 // The conversions operations are all Alpha sorted. Please keep it that way! | |
| 765 //============================================================================= | |
| 766 //------------------------------Value------------------------------------------ | |
| 767 const Type *ConvD2FNode::Value( PhaseTransform *phase ) const { | |
| 768 const Type *t = phase->type( in(1) ); | |
| 769 if( t == Type::TOP ) return Type::TOP; | |
| 770 if( t == Type::DOUBLE ) return Type::FLOAT; | |
| 771 const TypeD *td = t->is_double_constant(); | |
| 772 return TypeF::make( (float)td->getd() ); | |
| 773 } | |
| 774 | |
| 775 //------------------------------Identity--------------------------------------- | |
| 776 // Float's can be converted to doubles with no loss of bits. Hence | |
| 777 // converting a float to a double and back to a float is a NOP. | |
| 778 Node *ConvD2FNode::Identity(PhaseTransform *phase) { | |
| 779 return (in(1)->Opcode() == Op_ConvF2D) ? in(1)->in(1) : this; | |
| 780 } | |
| 781 | |
| 782 //============================================================================= | |
| 783 //------------------------------Value------------------------------------------ | |
| 784 const Type *ConvD2INode::Value( PhaseTransform *phase ) const { | |
| 785 const Type *t = phase->type( in(1) ); | |
| 786 if( t == Type::TOP ) return Type::TOP; | |
| 787 if( t == Type::DOUBLE ) return TypeInt::INT; | |
| 788 const TypeD *td = t->is_double_constant(); | |
| 789 return TypeInt::make( SharedRuntime::d2i( td->getd() ) ); | |
| 790 } | |
| 791 | |
| 792 //------------------------------Ideal------------------------------------------ | |
| 793 // If converting to an int type, skip any rounding nodes | |
| 794 Node *ConvD2INode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 795 if( in(1)->Opcode() == Op_RoundDouble ) | |
| 796 set_req(1,in(1)->in(1)); | |
| 797 return NULL; | |
| 798 } | |
| 799 | |
| 800 //------------------------------Identity--------------------------------------- | |
| 801 // Int's can be converted to doubles with no loss of bits. Hence | |
| 802 // converting an integer to a double and back to an integer is a NOP. | |
| 803 Node *ConvD2INode::Identity(PhaseTransform *phase) { | |
| 804 return (in(1)->Opcode() == Op_ConvI2D) ? in(1)->in(1) : this; | |
| 805 } | |
| 806 | |
| 807 //============================================================================= | |
| 808 //------------------------------Value------------------------------------------ | |
| 809 const Type *ConvD2LNode::Value( PhaseTransform *phase ) const { | |
| 810 const Type *t = phase->type( in(1) ); | |
| 811 if( t == Type::TOP ) return Type::TOP; | |
| 812 if( t == Type::DOUBLE ) return TypeLong::LONG; | |
| 813 const TypeD *td = t->is_double_constant(); | |
| 814 return TypeLong::make( SharedRuntime::d2l( td->getd() ) ); | |
| 815 } | |
| 816 | |
| 817 //------------------------------Identity--------------------------------------- | |
| 818 Node *ConvD2LNode::Identity(PhaseTransform *phase) { | |
| 819 // Remove ConvD2L->ConvL2D->ConvD2L sequences. | |
| 820 if( in(1) ->Opcode() == Op_ConvL2D && | |
| 821 in(1)->in(1)->Opcode() == Op_ConvD2L ) | |
| 822 return in(1)->in(1); | |
| 823 return this; | |
| 824 } | |
| 825 | |
| 826 //------------------------------Ideal------------------------------------------ | |
| 827 // If converting to an int type, skip any rounding nodes | |
| 828 Node *ConvD2LNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 829 if( in(1)->Opcode() == Op_RoundDouble ) | |
| 830 set_req(1,in(1)->in(1)); | |
| 831 return NULL; | |
| 832 } | |
| 833 | |
| 834 //============================================================================= | |
| 835 //------------------------------Value------------------------------------------ | |
| 836 const Type *ConvF2DNode::Value( PhaseTransform *phase ) const { | |
| 837 const Type *t = phase->type( in(1) ); | |
| 838 if( t == Type::TOP ) return Type::TOP; | |
| 839 if( t == Type::FLOAT ) return Type::DOUBLE; | |
| 840 const TypeF *tf = t->is_float_constant(); | |
| 841 return TypeD::make( (double)tf->getf() ); | |
| 842 } | |
| 843 | |
| 844 //============================================================================= | |
| 845 //------------------------------Value------------------------------------------ | |
| 846 const Type *ConvF2INode::Value( PhaseTransform *phase ) const { | |
| 847 const Type *t = phase->type( in(1) ); | |
| 848 if( t == Type::TOP ) return Type::TOP; | |
| 849 if( t == Type::FLOAT ) return TypeInt::INT; | |
| 850 const TypeF *tf = t->is_float_constant(); | |
| 851 return TypeInt::make( SharedRuntime::f2i( tf->getf() ) ); | |
| 852 } | |
| 853 | |
| 854 //------------------------------Identity--------------------------------------- | |
| 855 Node *ConvF2INode::Identity(PhaseTransform *phase) { | |
| 856 // Remove ConvF2I->ConvI2F->ConvF2I sequences. | |
| 857 if( in(1) ->Opcode() == Op_ConvI2F && | |
| 858 in(1)->in(1)->Opcode() == Op_ConvF2I ) | |
| 859 return in(1)->in(1); | |
| 860 return this; | |
| 861 } | |
| 862 | |
| 863 //------------------------------Ideal------------------------------------------ | |
| 864 // If converting to an int type, skip any rounding nodes | |
| 865 Node *ConvF2INode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 866 if( in(1)->Opcode() == Op_RoundFloat ) | |
| 867 set_req(1,in(1)->in(1)); | |
| 868 return NULL; | |
| 869 } | |
| 870 | |
| 871 //============================================================================= | |
| 872 //------------------------------Value------------------------------------------ | |
| 873 const Type *ConvF2LNode::Value( PhaseTransform *phase ) const { | |
| 874 const Type *t = phase->type( in(1) ); | |
| 875 if( t == Type::TOP ) return Type::TOP; | |
| 876 if( t == Type::FLOAT ) return TypeLong::LONG; | |
| 877 const TypeF *tf = t->is_float_constant(); | |
| 878 return TypeLong::make( SharedRuntime::f2l( tf->getf() ) ); | |
| 879 } | |
| 880 | |
| 881 //------------------------------Identity--------------------------------------- | |
| 882 Node *ConvF2LNode::Identity(PhaseTransform *phase) { | |
| 883 // Remove ConvF2L->ConvL2F->ConvF2L sequences. | |
| 884 if( in(1) ->Opcode() == Op_ConvL2F && | |
| 885 in(1)->in(1)->Opcode() == Op_ConvF2L ) | |
| 886 return in(1)->in(1); | |
| 887 return this; | |
| 888 } | |
| 889 | |
| 890 //------------------------------Ideal------------------------------------------ | |
| 891 // If converting to an int type, skip any rounding nodes | |
| 892 Node *ConvF2LNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 893 if( in(1)->Opcode() == Op_RoundFloat ) | |
| 894 set_req(1,in(1)->in(1)); | |
| 895 return NULL; | |
| 896 } | |
| 897 | |
| 898 //============================================================================= | |
| 899 //------------------------------Value------------------------------------------ | |
| 900 const Type *ConvI2DNode::Value( PhaseTransform *phase ) const { | |
| 901 const Type *t = phase->type( in(1) ); | |
| 902 if( t == Type::TOP ) return Type::TOP; | |
| 903 const TypeInt *ti = t->is_int(); | |
| 904 if( ti->is_con() ) return TypeD::make( (double)ti->get_con() ); | |
| 905 return bottom_type(); | |
| 906 } | |
| 907 | |
| 908 //============================================================================= | |
| 909 //------------------------------Value------------------------------------------ | |
| 910 const Type *ConvI2FNode::Value( PhaseTransform *phase ) const { | |
| 911 const Type *t = phase->type( in(1) ); | |
| 912 if( t == Type::TOP ) return Type::TOP; | |
| 913 const TypeInt *ti = t->is_int(); | |
| 914 if( ti->is_con() ) return TypeF::make( (float)ti->get_con() ); | |
| 915 return bottom_type(); | |
| 916 } | |
| 917 | |
| 918 //------------------------------Identity--------------------------------------- | |
| 919 Node *ConvI2FNode::Identity(PhaseTransform *phase) { | |
| 920 // Remove ConvI2F->ConvF2I->ConvI2F sequences. | |
| 921 if( in(1) ->Opcode() == Op_ConvF2I && | |
| 922 in(1)->in(1)->Opcode() == Op_ConvI2F ) | |
| 923 return in(1)->in(1); | |
| 924 return this; | |
| 925 } | |
| 926 | |
| 927 //============================================================================= | |
| 928 //------------------------------Value------------------------------------------ | |
| 929 const Type *ConvI2LNode::Value( PhaseTransform *phase ) const { | |
| 930 const Type *t = phase->type( in(1) ); | |
| 931 if( t == Type::TOP ) return Type::TOP; | |
| 932 const TypeInt *ti = t->is_int(); | |
| 933 const Type* tl = TypeLong::make(ti->_lo, ti->_hi, ti->_widen); | |
| 934 // Join my declared type against my incoming type. | |
| 935 tl = tl->filter(_type); | |
| 936 return tl; | |
| 937 } | |
| 938 | |
| 939 #ifdef _LP64 | |
| 940 static inline bool long_ranges_overlap(jlong lo1, jlong hi1, | |
| 941 jlong lo2, jlong hi2) { | |
| 942 // Two ranges overlap iff one range's low point falls in the other range. | |
| 943 return (lo2 <= lo1 && lo1 <= hi2) || (lo1 <= lo2 && lo2 <= hi1); | |
| 944 } | |
| 945 #endif | |
| 946 | |
| 947 //------------------------------Ideal------------------------------------------ | |
| 948 Node *ConvI2LNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 949 const TypeLong* this_type = this->type()->is_long(); | |
| 950 Node* this_changed = NULL; | |
| 951 | |
| 952 // If _major_progress, then more loop optimizations follow. Do NOT | |
| 953 // remove this node's type assertion until no more loop ops can happen. | |
| 954 // The progress bit is set in the major loop optimizations THEN comes the | |
| 955 // call to IterGVN and any chance of hitting this code. Cf. Opaque1Node. | |
| 956 if (can_reshape && !phase->C->major_progress()) { | |
| 957 const TypeInt* in_type = phase->type(in(1))->isa_int(); | |
| 958 if (in_type != NULL && this_type != NULL && | |
| 959 (in_type->_lo != this_type->_lo || | |
| 960 in_type->_hi != this_type->_hi)) { | |
| 961 // Although this WORSENS the type, it increases GVN opportunities, | |
| 962 // because I2L nodes with the same input will common up, regardless | |
| 963 // of slightly differing type assertions. Such slight differences | |
| 964 // arise routinely as a result of loop unrolling, so this is a | |
| 965 // post-unrolling graph cleanup. Choose a type which depends only | |
| 966 // on my input. (Exception: Keep a range assertion of >=0 or <0.) | |
| 967 jlong lo1 = this_type->_lo; | |
| 968 jlong hi1 = this_type->_hi; | |
| 969 int w1 = this_type->_widen; | |
| 970 if (lo1 != (jint)lo1 || | |
| 971 hi1 != (jint)hi1 || | |
| 972 lo1 > hi1) { | |
| 973 // Overflow leads to wraparound, wraparound leads to range saturation. | |
| 974 lo1 = min_jint; hi1 = max_jint; | |
| 975 } else if (lo1 >= 0) { | |
| 976 // Keep a range assertion of >=0. | |
| 977 lo1 = 0; hi1 = max_jint; | |
| 978 } else if (hi1 < 0) { | |
| 979 // Keep a range assertion of <0. | |
| 980 lo1 = min_jint; hi1 = -1; | |
| 981 } else { | |
| 982 lo1 = min_jint; hi1 = max_jint; | |
| 983 } | |
| 984 const TypeLong* wtype = TypeLong::make(MAX2((jlong)in_type->_lo, lo1), | |
| 985 MIN2((jlong)in_type->_hi, hi1), | |
| 986 MAX2((int)in_type->_widen, w1)); | |
| 987 if (wtype != type()) { | |
| 988 set_type(wtype); | |
| 989 // Note: this_type still has old type value, for the logic below. | |
| 990 this_changed = this; | |
| 991 } | |
| 992 } | |
| 993 } | |
| 994 | |
| 995 #ifdef _LP64 | |
| 996 // Convert ConvI2L(AddI(x, y)) to AddL(ConvI2L(x), ConvI2L(y)) , | |
| 997 // but only if x and y have subranges that cannot cause 32-bit overflow, | |
| 998 // under the assumption that x+y is in my own subrange this->type(). | |
| 999 | |
| 1000 // This assumption is based on a constraint (i.e., type assertion) | |
| 1001 // established in Parse::array_addressing or perhaps elsewhere. | |
| 1002 // This constraint has been adjoined to the "natural" type of | |
| 1003 // the incoming argument in(0). We know (because of runtime | |
| 1004 // checks) - that the result value I2L(x+y) is in the joined range. | |
| 1005 // Hence we can restrict the incoming terms (x, y) to values such | |
| 1006 // that their sum also lands in that range. | |
| 1007 | |
| 1008 // This optimization is useful only on 64-bit systems, where we hope | |
| 1009 // the addition will end up subsumed in an addressing mode. | |
| 1010 // It is necessary to do this when optimizing an unrolled array | |
| 1011 // copy loop such as x[i++] = y[i++]. | |
| 1012 | |
| 1013 // On 32-bit systems, it's better to perform as much 32-bit math as | |
| 1014 // possible before the I2L conversion, because 32-bit math is cheaper. | |
| 1015 // There's no common reason to "leak" a constant offset through the I2L. | |
| 1016 // Addressing arithmetic will not absorb it as part of a 64-bit AddL. | |
| 1017 | |
| 1018 Node* z = in(1); | |
| 1019 int op = z->Opcode(); | |
| 1020 if (op == Op_AddI || op == Op_SubI) { | |
| 1021 Node* x = z->in(1); | |
| 1022 Node* y = z->in(2); | |
| 1023 assert (x != z && y != z, "dead loop in ConvI2LNode::Ideal"); | |
| 1024 if (phase->type(x) == Type::TOP) return this_changed; | |
| 1025 if (phase->type(y) == Type::TOP) return this_changed; | |
| 1026 const TypeInt* tx = phase->type(x)->is_int(); | |
| 1027 const TypeInt* ty = phase->type(y)->is_int(); | |
| 1028 const TypeLong* tz = this_type; | |
| 1029 jlong xlo = tx->_lo; | |
| 1030 jlong xhi = tx->_hi; | |
| 1031 jlong ylo = ty->_lo; | |
| 1032 jlong yhi = ty->_hi; | |
| 1033 jlong zlo = tz->_lo; | |
| 1034 jlong zhi = tz->_hi; | |
| 1035 jlong vbit = CONST64(1) << BitsPerInt; | |
| 1036 int widen = MAX2(tx->_widen, ty->_widen); | |
| 1037 if (op == Op_SubI) { | |
| 1038 jlong ylo0 = ylo; | |
| 1039 ylo = -yhi; | |
| 1040 yhi = -ylo0; | |
| 1041 } | |
| 1042 // See if x+y can cause positive overflow into z+2**32 | |
| 1043 if (long_ranges_overlap(xlo+ylo, xhi+yhi, zlo+vbit, zhi+vbit)) { | |
| 1044 return this_changed; | |
| 1045 } | |
| 1046 // See if x+y can cause negative overflow into z-2**32 | |
| 1047 if (long_ranges_overlap(xlo+ylo, xhi+yhi, zlo-vbit, zhi-vbit)) { | |
| 1048 return this_changed; | |
| 1049 } | |
| 1050 // Now it's always safe to assume x+y does not overflow. | |
| 1051 // This is true even if some pairs x,y might cause overflow, as long | |
| 1052 // as that overflow value cannot fall into [zlo,zhi]. | |
| 1053 | |
| 1054 // Confident that the arithmetic is "as if infinite precision", | |
| 1055 // we can now use z's range to put constraints on those of x and y. | |
| 1056 // The "natural" range of x [xlo,xhi] can perhaps be narrowed to a | |
| 1057 // more "restricted" range by intersecting [xlo,xhi] with the | |
| 1058 // range obtained by subtracting y's range from the asserted range | |
| 1059 // of the I2L conversion. Here's the interval arithmetic algebra: | |
| 1060 // x == z-y == [zlo,zhi]-[ylo,yhi] == [zlo,zhi]+[-yhi,-ylo] | |
| 1061 // => x in [zlo-yhi, zhi-ylo] | |
| 1062 // => x in [zlo-yhi, zhi-ylo] INTERSECT [xlo,xhi] | |
| 1063 // => x in [xlo MAX zlo-yhi, xhi MIN zhi-ylo] | |
| 1064 jlong rxlo = MAX2(xlo, zlo - yhi); | |
| 1065 jlong rxhi = MIN2(xhi, zhi - ylo); | |
| 1066 // And similarly, x changing place with y: | |
| 1067 jlong rylo = MAX2(ylo, zlo - xhi); | |
| 1068 jlong ryhi = MIN2(yhi, zhi - xlo); | |
| 1069 if (rxlo > rxhi || rylo > ryhi) { | |
| 1070 return this_changed; // x or y is dying; don't mess w/ it | |
| 1071 } | |
| 1072 if (op == Op_SubI) { | |
| 1073 jlong rylo0 = rylo; | |
| 1074 rylo = -ryhi; | |
| 1075 ryhi = -rylo0; | |
| 1076 } | |
| 1077 | |
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1078 Node* cx = phase->transform( new (phase->C) ConvI2LNode(x, TypeLong::make(rxlo, rxhi, widen)) ); |
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1079 Node* cy = phase->transform( new (phase->C) ConvI2LNode(y, TypeLong::make(rylo, ryhi, widen)) ); |
| 0 | 1080 switch (op) { |
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1081 case Op_AddI: return new (phase->C) AddLNode(cx, cy); |
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1082 case Op_SubI: return new (phase->C) SubLNode(cx, cy); |
| 0 | 1083 default: ShouldNotReachHere(); |
| 1084 } | |
| 1085 } | |
| 1086 #endif //_LP64 | |
| 1087 | |
| 1088 return this_changed; | |
| 1089 } | |
| 1090 | |
| 1091 //============================================================================= | |
| 1092 //------------------------------Value------------------------------------------ | |
| 1093 const Type *ConvL2DNode::Value( PhaseTransform *phase ) const { | |
| 1094 const Type *t = phase->type( in(1) ); | |
| 1095 if( t == Type::TOP ) return Type::TOP; | |
| 1096 const TypeLong *tl = t->is_long(); | |
| 1097 if( tl->is_con() ) return TypeD::make( (double)tl->get_con() ); | |
| 1098 return bottom_type(); | |
| 1099 } | |
| 1100 | |
| 1101 //============================================================================= | |
| 1102 //------------------------------Value------------------------------------------ | |
| 1103 const Type *ConvL2FNode::Value( PhaseTransform *phase ) const { | |
| 1104 const Type *t = phase->type( in(1) ); | |
| 1105 if( t == Type::TOP ) return Type::TOP; | |
| 1106 const TypeLong *tl = t->is_long(); | |
| 1107 if( tl->is_con() ) return TypeF::make( (float)tl->get_con() ); | |
| 1108 return bottom_type(); | |
| 1109 } | |
| 1110 | |
| 1111 //============================================================================= | |
| 1112 //----------------------------Identity----------------------------------------- | |
| 1113 Node *ConvL2INode::Identity( PhaseTransform *phase ) { | |
| 1114 // Convert L2I(I2L(x)) => x | |
| 1115 if (in(1)->Opcode() == Op_ConvI2L) return in(1)->in(1); | |
| 1116 return this; | |
| 1117 } | |
| 1118 | |
| 1119 //------------------------------Value------------------------------------------ | |
| 1120 const Type *ConvL2INode::Value( PhaseTransform *phase ) const { | |
| 1121 const Type *t = phase->type( in(1) ); | |
| 1122 if( t == Type::TOP ) return Type::TOP; | |
| 1123 const TypeLong *tl = t->is_long(); | |
| 1124 if (tl->is_con()) | |
| 1125 // Easy case. | |
| 1126 return TypeInt::make((jint)tl->get_con()); | |
| 1127 return bottom_type(); | |
| 1128 } | |
| 1129 | |
| 1130 //------------------------------Ideal------------------------------------------ | |
| 1131 // Return a node which is more "ideal" than the current node. | |
| 1132 // Blow off prior masking to int | |
| 1133 Node *ConvL2INode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 1134 Node *andl = in(1); | |
| 1135 uint andl_op = andl->Opcode(); | |
| 1136 if( andl_op == Op_AndL ) { | |
| 1137 // Blow off prior masking to int | |
| 1138 if( phase->type(andl->in(2)) == TypeLong::make( 0xFFFFFFFF ) ) { | |
| 1139 set_req(1,andl->in(1)); | |
| 1140 return this; | |
| 1141 } | |
| 1142 } | |
| 1143 | |
| 1144 // Swap with a prior add: convL2I(addL(x,y)) ==> addI(convL2I(x),convL2I(y)) | |
| 1145 // This replaces an 'AddL' with an 'AddI'. | |
| 1146 if( andl_op == Op_AddL ) { | |
| 1147 // Don't do this for nodes which have more than one user since | |
| 1148 // we'll end up computing the long add anyway. | |
| 1149 if (andl->outcnt() > 1) return NULL; | |
| 1150 | |
| 1151 Node* x = andl->in(1); | |
| 1152 Node* y = andl->in(2); | |
| 1153 assert( x != andl && y != andl, "dead loop in ConvL2INode::Ideal" ); | |
| 1154 if (phase->type(x) == Type::TOP) return NULL; | |
| 1155 if (phase->type(y) == Type::TOP) return NULL; | |
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1156 Node *add1 = phase->transform(new (phase->C) ConvL2INode(x)); |
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1157 Node *add2 = phase->transform(new (phase->C) ConvL2INode(y)); |
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1158 return new (phase->C) AddINode(add1,add2); |
| 0 | 1159 } |
| 1160 | |
| 36 | 1161 // Disable optimization: LoadL->ConvL2I ==> LoadI. |
| 1162 // It causes problems (sizes of Load and Store nodes do not match) | |
| 1163 // in objects initialization code and Escape Analysis. | |
| 0 | 1164 return NULL; |
| 1165 } | |
| 1166 | |
| 1167 //============================================================================= | |
| 1168 //------------------------------Value------------------------------------------ | |
| 1169 const Type *CastX2PNode::Value( PhaseTransform *phase ) const { | |
| 1170 const Type* t = phase->type(in(1)); | |
| 5901 | 1171 if (t == Type::TOP) return Type::TOP; |
| 0 | 1172 if (t->base() == Type_X && t->singleton()) { |
| 1173 uintptr_t bits = (uintptr_t) t->is_intptr_t()->get_con(); | |
| 1174 if (bits == 0) return TypePtr::NULL_PTR; | |
| 1175 return TypeRawPtr::make((address) bits); | |
| 1176 } | |
| 1177 return CastX2PNode::bottom_type(); | |
| 1178 } | |
| 1179 | |
| 1180 //------------------------------Idealize--------------------------------------- | |
| 1181 static inline bool fits_in_int(const Type* t, bool but_not_min_int = false) { | |
| 1182 if (t == Type::TOP) return false; | |
| 1183 const TypeX* tl = t->is_intptr_t(); | |
| 1184 jint lo = min_jint; | |
| 1185 jint hi = max_jint; | |
| 1186 if (but_not_min_int) ++lo; // caller wants to negate the value w/o overflow | |
| 1187 return (tl->_lo >= lo) && (tl->_hi <= hi); | |
| 1188 } | |
| 1189 | |
| 1190 static inline Node* addP_of_X2P(PhaseGVN *phase, | |
| 1191 Node* base, | |
| 1192 Node* dispX, | |
| 1193 bool negate = false) { | |
| 1194 if (negate) { | |
|
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1195 dispX = new (phase->C) SubXNode(phase->MakeConX(0), phase->transform(dispX)); |
| 0 | 1196 } |
|
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1197 return new (phase->C) AddPNode(phase->C->top(), |
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1198 phase->transform(new (phase->C) CastX2PNode(base)), |
| 0 | 1199 phase->transform(dispX)); |
| 1200 } | |
| 1201 | |
| 1202 Node *CastX2PNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 1203 // convert CastX2P(AddX(x, y)) to AddP(CastX2P(x), y) if y fits in an int | |
| 1204 int op = in(1)->Opcode(); | |
| 1205 Node* x; | |
| 1206 Node* y; | |
| 1207 switch (op) { | |
| 1208 case Op_SubX: | |
| 1209 x = in(1)->in(1); | |
|
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1210 // Avoid ideal transformations ping-pong between this and AddP for raw pointers. |
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1211 if (phase->find_intptr_t_con(x, -1) == 0) |
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1212 break; |
| 0 | 1213 y = in(1)->in(2); |
| 1214 if (fits_in_int(phase->type(y), true)) { | |
| 1215 return addP_of_X2P(phase, x, y, true); | |
| 1216 } | |
| 1217 break; | |
| 1218 case Op_AddX: | |
| 1219 x = in(1)->in(1); | |
| 1220 y = in(1)->in(2); | |
| 1221 if (fits_in_int(phase->type(y))) { | |
| 1222 return addP_of_X2P(phase, x, y); | |
| 1223 } | |
| 1224 if (fits_in_int(phase->type(x))) { | |
| 1225 return addP_of_X2P(phase, y, x); | |
| 1226 } | |
| 1227 break; | |
| 1228 } | |
| 1229 return NULL; | |
| 1230 } | |
| 1231 | |
| 1232 //------------------------------Identity--------------------------------------- | |
| 1233 Node *CastX2PNode::Identity( PhaseTransform *phase ) { | |
| 1234 if (in(1)->Opcode() == Op_CastP2X) return in(1)->in(1); | |
| 1235 return this; | |
| 1236 } | |
| 1237 | |
| 1238 //============================================================================= | |
| 1239 //------------------------------Value------------------------------------------ | |
| 1240 const Type *CastP2XNode::Value( PhaseTransform *phase ) const { | |
| 1241 const Type* t = phase->type(in(1)); | |
| 5901 | 1242 if (t == Type::TOP) return Type::TOP; |
| 0 | 1243 if (t->base() == Type::RawPtr && t->singleton()) { |
| 1244 uintptr_t bits = (uintptr_t) t->is_rawptr()->get_con(); | |
| 1245 return TypeX::make(bits); | |
| 1246 } | |
| 1247 return CastP2XNode::bottom_type(); | |
| 1248 } | |
| 1249 | |
| 1250 Node *CastP2XNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 1251 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; | |
| 1252 } | |
| 1253 | |
| 1254 //------------------------------Identity--------------------------------------- | |
| 1255 Node *CastP2XNode::Identity( PhaseTransform *phase ) { | |
| 1256 if (in(1)->Opcode() == Op_CastX2P) return in(1)->in(1); | |
| 1257 return this; | |
| 1258 } | |
| 1259 | |
| 1260 | |
| 1261 //============================================================================= | |
| 1262 //------------------------------Identity--------------------------------------- | |
| 1263 // Remove redundant roundings | |
| 1264 Node *RoundFloatNode::Identity( PhaseTransform *phase ) { | |
| 1265 assert(Matcher::strict_fp_requires_explicit_rounding, "should only generate for Intel"); | |
| 1266 // Do not round constants | |
| 1267 if (phase->type(in(1))->base() == Type::FloatCon) return in(1); | |
| 1268 int op = in(1)->Opcode(); | |
| 1269 // Redundant rounding | |
| 1270 if( op == Op_RoundFloat ) return in(1); | |
| 1271 // Already rounded | |
| 1272 if( op == Op_Parm ) return in(1); | |
| 1273 if( op == Op_LoadF ) return in(1); | |
| 1274 return this; | |
| 1275 } | |
| 1276 | |
| 1277 //------------------------------Value------------------------------------------ | |
| 1278 const Type *RoundFloatNode::Value( PhaseTransform *phase ) const { | |
| 1279 return phase->type( in(1) ); | |
| 1280 } | |
| 1281 | |
| 1282 //============================================================================= | |
| 1283 //------------------------------Identity--------------------------------------- | |
| 1284 // Remove redundant roundings. Incoming arguments are already rounded. | |
| 1285 Node *RoundDoubleNode::Identity( PhaseTransform *phase ) { | |
| 1286 assert(Matcher::strict_fp_requires_explicit_rounding, "should only generate for Intel"); | |
| 1287 // Do not round constants | |
| 1288 if (phase->type(in(1))->base() == Type::DoubleCon) return in(1); | |
| 1289 int op = in(1)->Opcode(); | |
| 1290 // Redundant rounding | |
| 1291 if( op == Op_RoundDouble ) return in(1); | |
| 1292 // Already rounded | |
| 1293 if( op == Op_Parm ) return in(1); | |
| 1294 if( op == Op_LoadD ) return in(1); | |
| 1295 if( op == Op_ConvF2D ) return in(1); | |
| 1296 if( op == Op_ConvI2D ) return in(1); | |
| 1297 return this; | |
| 1298 } | |
| 1299 | |
| 1300 //------------------------------Value------------------------------------------ | |
| 1301 const Type *RoundDoubleNode::Value( PhaseTransform *phase ) const { | |
| 1302 return phase->type( in(1) ); | |
| 1303 } | |
| 1304 | |
| 1305 | |
| 1306 //============================================================================= | |
| 1307 // Do not allow value-numbering | |
| 1308 uint Opaque1Node::hash() const { return NO_HASH; } | |
| 1309 uint Opaque1Node::cmp( const Node &n ) const { | |
| 1310 return (&n == this); // Always fail except on self | |
| 1311 } | |
| 1312 | |
| 1313 //------------------------------Identity--------------------------------------- | |
| 1314 // If _major_progress, then more loop optimizations follow. Do NOT remove | |
| 1315 // the opaque Node until no more loop ops can happen. Note the timing of | |
| 1316 // _major_progress; it's set in the major loop optimizations THEN comes the | |
| 1317 // call to IterGVN and any chance of hitting this code. Hence there's no | |
| 1318 // phase-ordering problem with stripping Opaque1 in IGVN followed by some | |
| 1319 // more loop optimizations that require it. | |
| 1320 Node *Opaque1Node::Identity( PhaseTransform *phase ) { | |
| 1321 return phase->C->major_progress() ? this : in(1); | |
| 1322 } | |
| 1323 | |
| 1324 //============================================================================= | |
| 1325 // A node to prevent unwanted optimizations. Allows constant folding. Stops | |
| 1326 // value-numbering, most Ideal calls or Identity functions. This Node is | |
| 1327 // specifically designed to prevent the pre-increment value of a loop trip | |
| 1328 // counter from being live out of the bottom of the loop (hence causing the | |
| 1329 // pre- and post-increment values both being live and thus requiring an extra | |
| 1330 // temp register and an extra move). If we "accidentally" optimize through | |
| 1331 // this kind of a Node, we'll get slightly pessimal, but correct, code. Thus | |
| 1332 // it's OK to be slightly sloppy on optimizations here. | |
| 1333 | |
| 1334 // Do not allow value-numbering | |
| 1335 uint Opaque2Node::hash() const { return NO_HASH; } | |
| 1336 uint Opaque2Node::cmp( const Node &n ) const { | |
| 1337 return (&n == this); // Always fail except on self | |
| 1338 } | |
| 1339 | |
| 1340 | |
| 1341 //------------------------------Value------------------------------------------ | |
| 1342 const Type *MoveL2DNode::Value( PhaseTransform *phase ) const { | |
| 1343 const Type *t = phase->type( in(1) ); | |
| 1344 if( t == Type::TOP ) return Type::TOP; | |
| 1345 const TypeLong *tl = t->is_long(); | |
| 1346 if( !tl->is_con() ) return bottom_type(); | |
| 1347 JavaValue v; | |
| 1348 v.set_jlong(tl->get_con()); | |
| 1349 return TypeD::make( v.get_jdouble() ); | |
| 1350 } | |
| 1351 | |
| 1352 //------------------------------Value------------------------------------------ | |
| 1353 const Type *MoveI2FNode::Value( PhaseTransform *phase ) const { | |
| 1354 const Type *t = phase->type( in(1) ); | |
| 1355 if( t == Type::TOP ) return Type::TOP; | |
| 1356 const TypeInt *ti = t->is_int(); | |
| 1357 if( !ti->is_con() ) return bottom_type(); | |
| 1358 JavaValue v; | |
| 1359 v.set_jint(ti->get_con()); | |
| 1360 return TypeF::make( v.get_jfloat() ); | |
| 1361 } | |
| 1362 | |
| 1363 //------------------------------Value------------------------------------------ | |
| 1364 const Type *MoveF2INode::Value( PhaseTransform *phase ) const { | |
| 1365 const Type *t = phase->type( in(1) ); | |
| 1366 if( t == Type::TOP ) return Type::TOP; | |
| 1367 if( t == Type::FLOAT ) return TypeInt::INT; | |
| 1368 const TypeF *tf = t->is_float_constant(); | |
| 1369 JavaValue v; | |
| 1370 v.set_jfloat(tf->getf()); | |
| 1371 return TypeInt::make( v.get_jint() ); | |
| 1372 } | |
| 1373 | |
| 1374 //------------------------------Value------------------------------------------ | |
| 1375 const Type *MoveD2LNode::Value( PhaseTransform *phase ) const { | |
| 1376 const Type *t = phase->type( in(1) ); | |
| 1377 if( t == Type::TOP ) return Type::TOP; | |
| 1378 if( t == Type::DOUBLE ) return TypeLong::LONG; | |
| 1379 const TypeD *td = t->is_double_constant(); | |
| 1380 JavaValue v; | |
| 1381 v.set_jdouble(td->getd()); | |
| 1382 return TypeLong::make( v.get_jlong() ); | |
| 1383 } | |
|
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1384 |
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1385 //------------------------------Value------------------------------------------ |
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1386 const Type* CountLeadingZerosINode::Value(PhaseTransform* phase) const { |
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1387 const Type* t = phase->type(in(1)); |
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1388 if (t == Type::TOP) return Type::TOP; |
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1389 const TypeInt* ti = t->isa_int(); |
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1390 if (ti && ti->is_con()) { |
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1391 jint i = ti->get_con(); |
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1392 // HD, Figure 5-6 |
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1393 if (i == 0) |
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1394 return TypeInt::make(BitsPerInt); |
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1395 int n = 1; |
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1396 unsigned int x = i; |
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1397 if (x >> 16 == 0) { n += 16; x <<= 16; } |
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1398 if (x >> 24 == 0) { n += 8; x <<= 8; } |
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1399 if (x >> 28 == 0) { n += 4; x <<= 4; } |
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1400 if (x >> 30 == 0) { n += 2; x <<= 2; } |
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1401 n -= x >> 31; |
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1402 return TypeInt::make(n); |
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1403 } |
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1404 return TypeInt::INT; |
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1405 } |
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1406 |
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1407 //------------------------------Value------------------------------------------ |
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1408 const Type* CountLeadingZerosLNode::Value(PhaseTransform* phase) const { |
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1409 const Type* t = phase->type(in(1)); |
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1410 if (t == Type::TOP) return Type::TOP; |
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1411 const TypeLong* tl = t->isa_long(); |
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1412 if (tl && tl->is_con()) { |
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1413 jlong l = tl->get_con(); |
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1414 // HD, Figure 5-6 |
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1415 if (l == 0) |
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1416 return TypeInt::make(BitsPerLong); |
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1417 int n = 1; |
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1418 unsigned int x = (((julong) l) >> 32); |
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1419 if (x == 0) { n += 32; x = (int) l; } |
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1420 if (x >> 16 == 0) { n += 16; x <<= 16; } |
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1421 if (x >> 24 == 0) { n += 8; x <<= 8; } |
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1422 if (x >> 28 == 0) { n += 4; x <<= 4; } |
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1423 if (x >> 30 == 0) { n += 2; x <<= 2; } |
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1424 n -= x >> 31; |
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1425 return TypeInt::make(n); |
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1426 } |
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1427 return TypeInt::INT; |
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1428 } |
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1429 |
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1430 //------------------------------Value------------------------------------------ |
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1431 const Type* CountTrailingZerosINode::Value(PhaseTransform* phase) const { |
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1432 const Type* t = phase->type(in(1)); |
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1433 if (t == Type::TOP) return Type::TOP; |
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1434 const TypeInt* ti = t->isa_int(); |
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1435 if (ti && ti->is_con()) { |
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1436 jint i = ti->get_con(); |
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1437 // HD, Figure 5-14 |
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1438 int y; |
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1439 if (i == 0) |
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1440 return TypeInt::make(BitsPerInt); |
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1441 int n = 31; |
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1442 y = i << 16; if (y != 0) { n = n - 16; i = y; } |
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1443 y = i << 8; if (y != 0) { n = n - 8; i = y; } |
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1444 y = i << 4; if (y != 0) { n = n - 4; i = y; } |
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1445 y = i << 2; if (y != 0) { n = n - 2; i = y; } |
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1446 y = i << 1; if (y != 0) { n = n - 1; } |
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1447 return TypeInt::make(n); |
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1448 } |
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1449 return TypeInt::INT; |
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1450 } |
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1451 |
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1452 //------------------------------Value------------------------------------------ |
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1453 const Type* CountTrailingZerosLNode::Value(PhaseTransform* phase) const { |
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1454 const Type* t = phase->type(in(1)); |
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1455 if (t == Type::TOP) return Type::TOP; |
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1456 const TypeLong* tl = t->isa_long(); |
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1457 if (tl && tl->is_con()) { |
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1458 jlong l = tl->get_con(); |
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1459 // HD, Figure 5-14 |
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1460 int x, y; |
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1461 if (l == 0) |
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1462 return TypeInt::make(BitsPerLong); |
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1463 int n = 63; |
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1464 y = (int) l; if (y != 0) { n = n - 32; x = y; } else x = (((julong) l) >> 32); |
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1465 y = x << 16; if (y != 0) { n = n - 16; x = y; } |
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1466 y = x << 8; if (y != 0) { n = n - 8; x = y; } |
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1467 y = x << 4; if (y != 0) { n = n - 4; x = y; } |
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1468 y = x << 2; if (y != 0) { n = n - 2; x = y; } |
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1469 y = x << 1; if (y != 0) { n = n - 1; } |
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1470 return TypeInt::make(n); |
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1471 } |
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1472 return TypeInt::INT; |
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1473 } |