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ARM: Implement DoMathRound in the lithium code generator.

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Review URL: http://codereview.chromium.org/6519051

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6860 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
karlklose@chromium.org 2011-02-21 10:30:25 +00:00
parent 1e89c4aa67
commit 24b73a04b0
3 changed files with 29 additions and 2 deletions
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3
src/arm/lithium-arm.cc
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@ -1204,8 +1204,7 @@ LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
case kMathSqrt:
return DefineSameAsFirst(result);
case kMathRound:
Abort("MathRound LUnaryMathOperation not implemented");
return NULL;
return AssignEnvironment(DefineAsRegister(result));
case kMathPowHalf:
Abort("MathPowHalf LUnaryMathOperation not implemented");
return NULL;

27
src/arm/lithium-codegen-arm.cc
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@ -2609,6 +2609,30 @@ void LCodeGen::DoMathFloor(LUnaryMathOperation* instr) {
}
void LCodeGen::DoMathRound(LUnaryMathOperation* instr) {
DoubleRegister input = ToDoubleRegister(instr->InputAt(0));
Register result = ToRegister(instr->result());
Register scratch1 = scratch0();
Register scratch2 = result;
EmitVFPTruncate(kRoundToNearest,
double_scratch0().low(),
input,
scratch1,
scratch2);
DeoptimizeIf(ne, instr->environment());
__ vmov(result, double_scratch0().low());
// Test for -0.
Label done;
__ cmp(result, Operand(0));
__ b(ne, &done);
__ vmov(scratch1, input.high());
__ tst(scratch1, Operand(HeapNumber::kSignMask));
DeoptimizeIf(ne, instr->environment());
__ bind(&done);
}
void LCodeGen::DoMathSqrt(LUnaryMathOperation* instr) {
DoubleRegister input = ToDoubleRegister(instr->InputAt(0));
ASSERT(ToDoubleRegister(instr->result()).is(input));
@ -2624,6 +2648,9 @@ void LCodeGen::DoUnaryMathOperation(LUnaryMathOperation* instr) {
case kMathFloor:
DoMathFloor(instr);
break;
case kMathRound:
DoMathRound(instr);
break;
case kMathSqrt:
DoMathSqrt(instr);
break;

1
src/arm/lithium-codegen-arm.h
View File

@ -212,6 +212,7 @@ class LCodeGen BASE_EMBEDDED {
Register scratch1,
Register scratch2);
void DoMathFloor(LUnaryMathOperation* instr);
void DoMathRound(LUnaryMathOperation* instr);
void DoMathSqrt(LUnaryMathOperation* instr);
// Support for recording safepoint and position information.