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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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10
libc/math/__fpclassify.c Normal file
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#include "libc/math/math.h"
int __fpclassify(double x)
{
union {double f; uint64_t i;} u = {x};
int e = u.i>>52 & 0x7ff;
if (!e) return u.i<<1 ? FP_SUBNORMAL : FP_ZERO;
if (e==0x7ff) return u.i<<12 ? FP_NAN : FP_INFINITE;
return FP_NORMAL;
}