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12 lines
259 B
12 lines
259 B
7 years ago
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#include <math.h>
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#include <stdint.h>
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int __fpclassifyd(double x)
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{
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union {double f; uint64_t i;} u = {x};
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int e = u.i>>52 & 0x7ff;
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if (!e) return u.i<<1 ? FP_SUBNORMAL : FP_ZERO;
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if (e==0x7ff) return u.i<<12 ? FP_NAN : FP_INFINITE;
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return FP_NORMAL;
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}
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