minix/lib/libm/src/s_isinf.c

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/*
* Written by J.T. Conklin <jtc@NetBSD.org>.
* Public domain.
*/
#include <sys/cdefs.h>
#if defined(LIBM_SCCS) && !defined(lint)
__RCSID("$NetBSD: s_isinf.c,v 1.6 2003/07/26 19:25:05 salo Exp $");
#endif
/*
* isinf(x) returns 1 is x is inf, else 0;
* no branching!
*/
#include "math.h"
#include "math_private.h"
int
isinf(double x)
{
int32_t hx,lx;
EXTRACT_WORDS(hx,lx,x);
hx &= 0x7fffffff;
hx ^= 0x7ff00000;
hx |= lx;
return (hx == 0);
}