source:
EcnlProtoTool/trunk/musl-1.1.18/src/math/__fpclassifyf.c
Last change on this file was 444, checked in by , 4 years ago | |
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File size: 254 bytes |
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1 | #include <math.h> |
2 | #include <stdint.h> |
3 | |
4 | int __fpclassifyf(float x) |
5 | { |
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; |
11 | } |
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