ack/lang/cem/libcc.ansi/math/isnan.c
1991-08-27 08:57:28 +00:00

12 lines
201 B
C

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