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Bug 1176864 - Truncate modulo operator for int32 r=h4writer, r=nbp

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This commit is contained in:
Sander Mathijs van Veen 2015-06-26 00:18:20 +02:00
parent ec217a555e
commit 649691e4ac
1 changed files with 6 additions and 3 deletions
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9
js/src/jit/RangeAnalysis.cpp
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@ -2902,10 +2902,13 @@ ComputeTruncateKind(MDefinition* candidate, bool* shouldClone)
const Range* r = candidate->range();
bool canHaveRoundingErrors = !r || r->canHaveRoundingErrors();
// Special case integer division: the result of a/b can be infinite
// but cannot actually have rounding errors induced by truncation.
if (candidate->isDiv() && candidate->toDiv()->specialization() == MIRType_Int32)
// Special case integer division and modulo: a/b can be infinite, and a%b
// can be NaN but cannot actually have rounding errors induced by truncation.
if ((candidate->isDiv() || candidate->isMod()) &&
static_cast<const MBinaryArithInstruction *>(candidate)->specialization() == MIRType_Int32)
{
canHaveRoundingErrors = false;
}
if (canHaveRoundingErrors)
return MDefinition::NoTruncate;