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musl
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src
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math
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fabs.c
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#include
<math.h>
#include
<stdint.h>
double
fabs
(
double
x
)
{
union
{
double
f
;
uint64_t
i
;}
u
=
{
x
};
u
.
i
&=
-
1ULL
/
2
;
return
u
.
f
;
}