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Unified Diff: src/arm/lithium-arm.cc

Issue 204583002: Implement flooring division by a constant via truncating division by a constant. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Rebased Created 6 years, 9 months ago
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Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index fac89e494916f7d0db8c762f40dded39b2efee38..55705b8073cfd0a8e3f91b8d7aa1beca58b1b978 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -1332,20 +1332,25 @@ LInstruction* LChunkBuilder::DoFlooringDivByConstI(HMathFloorOfDiv* instr) {
ASSERT(instr->right()->representation().Equals(instr->representation()));
LOperand* dividend = UseRegister(instr->left());
int32_t divisor = instr->right()->GetInteger32Constant();
- LInstruction* result =
- DefineAsRegister(new(zone()) LFlooringDivByConstI(dividend, divisor));
- bool can_deopt =
- divisor == 0 ||
- (instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0);
- return can_deopt ? AssignEnvironment(result) : result;
+ LOperand* temp =
+ ((divisor > 0 && !instr->CheckFlag(HValue::kLeftCanBeNegative)) ||
+ (divisor < 0 && !instr->CheckFlag(HValue::kLeftCanBePositive))) ?
+ NULL : TempRegister();
+ LInstruction* result = DefineAsRegister(
+ new(zone()) LFlooringDivByConstI(dividend, divisor, temp));
+ if (divisor == 0 ||
+ (instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0)) {
+ result = AssignEnvironment(result);
+ }
+ return result;
}
LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) {
if (instr->RightIsPowerOf2()) {
return DoFlooringDivByPowerOf2I(instr);
- } else if (false && instr->right()->IsConstant()) {
- return DoFlooringDivByConstI(instr); // TODO(svenpanne) Fix and re-enable.
+ } else if (instr->right()->IsConstant()) {
+ return DoFlooringDivByConstI(instr);
} else {
return DoDivI(instr);
}
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