aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/libm-ieee754/s_isinf.c
blob: b35fc1c41c5321362ff66aa07e60d0973e575b9c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
/*
 * Written by J.T. Conklin <jtc@netbsd.org>.
 * Public domain.
 */

#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: s_isinf.c,v 1.3 1995/05/11 23:20:14 jtc Exp $";
#endif

/*
 * isinf(x) returns 1 is x is inf, else 0;
 * no branching!
 */

#include "math.h"
#include "math_private.h"

#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 ^= 0x7ff00000;
	hx |= lx;
	return (hx == 0);
}
weak_alias (__isinf, isinf)
#ifdef NO_LONG_DOUBLE
strong_alias (__isinf, __isinfl)
weak_alias (__isinf, isinfl)
#endif