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another day, another __isNaN

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rsc 2007-04-06 13:27:55 +00:00
parent fdfecd6860
commit ada7ea055b
1 changed files with 2 additions and 1 deletions
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src/lib9/fmt/nan64.c
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@ -31,7 +31,8 @@ __isNaN(double d)
p = &d; p = &d;
x = *(uvlong*)p; x = *(uvlong*)p;
return (ulong)((x>>52)&0x7FF)==0x7FF && !__isInf(d, 0); /* IEEE 754: exponent bits 0x7FF and non-zero mantissa */
return (x&uvinf) == uvinf && (x&~uvneginf) != 0;
} }
double double