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Code Issues Projects Releases Packages Wiki Activity Actions 9

LibM: optimized (branchless) copysign

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This commit is contained in:
Nick Wanninger 2021-03-05 18:09:48 -06:00 • committed by Andreas Kling
commit c3f417aa1e
Notes: sideshowbarker 2024-07-18 21:41:01 +09:00
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)
{
if (x < 0 && y < 0)
return x;
if (x >= 0 && y < 0)
return -x;
if (x < 0 && y >= 0)
return -x;
return x;
using Extractor = FloatExtractor<decltype(x)>;
Extractor ex, ey;
ex.d = x;
ey.d = y;
ex.sign = ey.sign;
return ex.d;
}
}