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LibM: Implement copysign for float and long double

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Mițca Dumitru 2021-03-07 23:14:46 +02:00 • committed by Andreas Kling
parent 87b61b0eef
commit b274120b3c
2 changed files with 26 additions and 8 deletions
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30
Userland/Libraries/LibM/math.cpp
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@ -289,6 +289,17 @@ static FloatT internal_scalbn(FloatT x, int exponent) NOEXCEPT
return extractor.d; return extractor.d;
} }
template<typename FloatT>
static FloatT internal_copysign(FloatT x, FloatT y) NOEXCEPT
{
using Extractor = FloatExtractor<FloatT>;
Extractor ex, ey;
ex.d = x;
ey.d = y;
ex.sign = ey.sign;
return ex.d;
}
extern "C" { extern "C" {
double trunc(double x) NOEXCEPT double trunc(double x) NOEXCEPT
@ -845,14 +856,19 @@ long double nexttowardl(long double, long double) NOEXCEPT
TODO(); TODO();
} }
double copysign(double x, double y) float copysignf(float x, float y) NOEXCEPT
{ {
using Extractor = FloatExtractor<decltype(x)>; return internal_copysign(x, y);
Extractor ex, ey; }
ex.d = x;
ey.d = y; double copysign(double x, double y) NOEXCEPT
ex.sign = ey.sign; {
return ex.d; return internal_copysign(x, y);
}
long double copysignl(long double x, long double y) NOEXCEPT
{
return internal_copysign(x, y);
} }
float scalbnf(float x, int exponent) NOEXCEPT float scalbnf(float x, int exponent) NOEXCEPT

4
Userland/Libraries/LibM/math.h
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@ -170,6 +170,8 @@ float scalbnlf(float, long) NOEXCEPT;
double scalbln(double, long) NOEXCEPT; double scalbln(double, long) NOEXCEPT;
long double scalblnl(long double, long) NOEXCEPT; long double scalblnl(long double, long) NOEXCEPT;
double copysign(double x, double y); float copysignf(float x, float y) NOEXCEPT;
double copysign(double x, double y) NOEXCEPT;
long double copysignl(long double x, long double y) NOEXCEPT;
__END_DECLS __END_DECLS