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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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1221 } | 1221 } |
1222 | 1222 |
1223 | 1223 |
1224 HValue* LChunkBuilder::SimplifiedDivisorForMathFloorOfDiv(HValue* divisor) { | 1224 HValue* LChunkBuilder::SimplifiedDivisorForMathFloorOfDiv(HValue* divisor) { |
1225 if (divisor->IsConstant() && | 1225 if (divisor->IsConstant() && |
1226 HConstant::cast(divisor)->HasInteger32Value()) { | 1226 HConstant::cast(divisor)->HasInteger32Value()) { |
1227 HConstant* constant_val = HConstant::cast(divisor); | 1227 HConstant* constant_val = HConstant::cast(divisor); |
1228 return constant_val->CopyToRepresentation(Representation::Integer32(), | 1228 return constant_val->CopyToRepresentation(Representation::Integer32(), |
1229 divisor->block()->zone()); | 1229 divisor->block()->zone()); |
1230 } | 1230 } |
| 1231 // A value with an integer representation does not need to be transformed. |
| 1232 if (divisor->representation().IsInteger32()) { |
| 1233 return divisor; |
| 1234 // A change from an integer32 can be replaced by the integer32 value. |
| 1235 } else if (divisor->IsChange() && |
| 1236 HChange::cast(divisor)->from().IsInteger32()) { |
| 1237 return HChange::cast(divisor)->value(); |
| 1238 } |
1231 return NULL; | 1239 return NULL; |
1232 } | 1240 } |
1233 | 1241 |
1234 | 1242 |
1235 LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) { | 1243 LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) { |
1236 HValue* right = instr->right(); | 1244 HValue* right = instr->right(); |
| 1245 if (!right->IsConstant()) { |
| 1246 ASSERT(right->representation().IsInteger32()); |
| 1247 // The temporary operand is necessary to ensure that right is not allocated |
| 1248 // into rdx. |
| 1249 LOperand* temp = FixedTemp(rdx); |
| 1250 LOperand* dividend = UseFixed(instr->left(), rax); |
| 1251 LOperand* divisor = UseRegister(instr->right()); |
| 1252 LDivI* flooring_div = new(zone()) LDivI(dividend, divisor, temp); |
| 1253 return AssignEnvironment(DefineFixed(flooring_div, rax)); |
| 1254 } |
| 1255 |
1237 ASSERT(right->IsConstant() && HConstant::cast(right)->HasInteger32Value()); | 1256 ASSERT(right->IsConstant() && HConstant::cast(right)->HasInteger32Value()); |
1238 LOperand* divisor = chunk_->DefineConstantOperand(HConstant::cast(right)); | 1257 LOperand* divisor = chunk_->DefineConstantOperand(HConstant::cast(right)); |
1239 int32_t divisor_si = HConstant::cast(right)->Integer32Value(); | 1258 int32_t divisor_si = HConstant::cast(right)->Integer32Value(); |
1240 if (divisor_si == 0) { | 1259 if (divisor_si == 0) { |
1241 LOperand* dividend = UseRegister(instr->left()); | 1260 LOperand* dividend = UseRegister(instr->left()); |
1242 return AssignEnvironment(DefineAsRegister( | 1261 return AssignEnvironment(DefineAsRegister( |
1243 new(zone()) LMathFloorOfDiv(dividend, divisor, NULL))); | 1262 new(zone()) LMathFloorOfDiv(dividend, divisor, NULL))); |
1244 } else if (IsPowerOf2(abs(divisor_si))) { | 1263 } else if (IsPowerOf2(abs(divisor_si))) { |
1245 LOperand* dividend = UseRegisterAtStart(instr->left()); | 1264 LOperand* dividend = UseRegisterAtStart(instr->left()); |
1246 LInstruction* result = DefineAsRegister( | 1265 LInstruction* result = DefineAsRegister( |
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2327 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) { | 2346 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) { |
2328 LOperand* object = UseRegister(instr->object()); | 2347 LOperand* object = UseRegister(instr->object()); |
2329 LOperand* index = UseTempRegister(instr->index()); | 2348 LOperand* index = UseTempRegister(instr->index()); |
2330 return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index)); | 2349 return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index)); |
2331 } | 2350 } |
2332 | 2351 |
2333 | 2352 |
2334 } } // namespace v8::internal | 2353 } } // namespace v8::internal |
2335 | 2354 |
2336 #endif // V8_TARGET_ARCH_X64 | 2355 #endif // V8_TARGET_ARCH_X64 |
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