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| author | Rich Felker <dalias@aerifal.cx> | 2011-02-12 00:22:29 -0500 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-02-12 00:22:29 -0500 |
| commit | 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch) | |
| tree | 6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/math/__fpclassify.c | |
| download | musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.gz | |
initial check-in, version 0.5.0v0.5.0
Diffstat (limited to 'src/math/__fpclassify.c')
| -rw-r--r-- | src/math/__fpclassify.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/math/__fpclassify.c b/src/math/__fpclassify.c new file mode 100644 index 00000000..16051100 --- /dev/null +++ b/src/math/__fpclassify.c @@ -0,0 +1,14 @@ +#include <stdint.h> +#include <math.h> + +int __fpclassify(double __x) +{ + union { + double __d; + __uint64_t __i; + } __y = { __x }; + int __ee = __y.__i>>52 & 0x7ff; + if (!__ee) return __y.__i<<1 ? FP_SUBNORMAL : FP_ZERO; + if (__ee==0x7ff) return __y.__i<<12 ? FP_NAN : FP_INFINITE; + return FP_NORMAL; +} |