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ulib
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musl
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math
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copysign.c
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#include
"libm.h"
double
copysign
(
double
x
,
double
y
)
{
union
{
double
f
;
uint64_t
i
;
}
ux
=
{
x
},
uy
=
{
y
};
ux
.
i
&=
-
1ULL
/
2
;
ux
.
i
|=
uy
.
i
&
1ULL
<<
63
;
return
ux
.
f
;
}