add PTHREAD_NULL
[musl.git] / src / math / __fpclassifyf.c
blobfd00eb1bcdc62e08c2ed1c8bdb8ac09dce3d0b52
1 #include <math.h>
2 #include <stdint.h>
4 int __fpclassifyf(float x)
6 union {float f; uint32_t i;} u = {x};
7 int e = u.i>>23 & 0xff;
8 if (!e) return u.i<<1 ? FP_SUBNORMAL : FP_ZERO;
9 if (e==0xff) return u.i<<9 ? FP_NAN : FP_INFINITE;
10 return FP_NORMAL;