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Bug 1076670 - Workaround VS2013 64-bit returning +0 instead of -0 for sin(-0). r=luke

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This commit is contained in:
Jan de Mooij 2014-10-09 13:11:03 +02:00
parent a67fc34972
commit 3ca3ee107e
1 changed files with 7 additions and 1 deletions
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8
js/src/jsmath.cpp
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@ -878,12 +878,18 @@ js::math_round(JSContext *cx, unsigned argc, Value *vp)
double
js::math_sin_impl(MathCache *cache, double x)
{
return cache->lookup(sin, x, MathCache::Sin);
return cache->lookup(math_sin_uncached, x, MathCache::Sin);
}
double
js::math_sin_uncached(double x)
{
#ifdef _WIN64
// Workaround MSVC bug where sin(-0) is +0 instead of -0 on x64 on
// CPUs without FMA3 (pre-Haswell). See bug 1076670.
if (IsNegativeZero(x))
return -0.0;
#endif
return sin(x);
}