newlib-cygwin/newlib/libm/math/s_isinf.c

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2000-02-18 03:39:52 +08:00
/*
* isinf(x) returns 1 if x is infinity, else 0;
* no branching!
* Added by Cygnus Support.
*/
#include "fdlibm.h"
#ifndef _DOUBLE_IS_32BITS
#ifdef __STDC__
int isinf(double x)
#else
int isinf(x)
double x;
#endif
{
__int32_t hx,lx;
EXTRACT_WORDS(hx,lx,x);
hx &= 0x7fffffff;
hx |= (__uint32_t)(lx|(-lx))>>31;
hx = 0x7ff00000 - hx;
return 1 - (int)((__uint32_t)(hx|(-hx))>>31);
}
#endif /* _DOUBLE_IS_32BITS */