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LibM: optimized (branchless) copysign

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Nick Wanninger 2021-03-05 18:09:48 -06:00 • committed by Andreas Kling
parent cfa100cb65
commit c3f417aa1e
1 changed files with 6 additions and 7 deletions
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13
Userland/Libraries/LibM/math.cpp
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@ -745,12 +745,11 @@ long double nexttowardl(long double, long double) NOEXCEPT
double copysign(double x, double y) double copysign(double x, double y)
{ {
if (x < 0 && y < 0) using Extractor = FloatExtractor<decltype(x)>;
return x; Extractor ex, ey;
if (x >= 0 && y < 0) ex.d = x;
return -x; ey.d = y;
if (x < 0 && y >= 0) ex.sign = ey.sign;
return -x; return ex.d;
return x;
} }
} }