circuitpython/lib/libm_dbl/__fpclassify.c

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

12 lines
259 B
C
Raw Permalink Normal View History

#include <math.h>
#include <stdint.h>
int __fpclassifyd(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;
}