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initial check-in, version 0.5.0
[oweals/musl.git]
/
src
/
math
/
__fpclassify.c
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#include <stdint.h>
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#include <math.h>
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int __fpclassify(double __x)
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{
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union {
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double __d;
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__uint64_t __i;
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} __y = { __x };
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int __ee = __y.__i>>52 & 0x7ff;
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if (!__ee) return __y.__i<<1 ? FP_SUBNORMAL : FP_ZERO;
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if (__ee==0x7ff) return __y.__i<<12 ? FP_NAN : FP_INFINITE;
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return FP_NORMAL;
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}