ack/lang/cem/libcc.ansi/core/math/isnan.c

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__IsNan(double d)
{
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#if defined(__vax) || defined(__pdp)
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#else
float f = d;
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if ((*((long*)&f) & 0x7f800000) == 0x7f800000 && (*((long*)&f) & 0x007fffff) != 0)
return 1;
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#endif
return 0;
}