blob: ab509a00ae30fcac3a4e81bd509dd9bced8095d3 (
plain) (
blame)
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
|
/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Changed to return -1 for -Inf by Ulrich Drepper <drepper@cygnus.com>.
* 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, -1 if 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);
lx |= (hx & 0x7fffffff) ^ 0x7ff00000;
lx |= -lx;
return ~(lx >> 31) & (hx >> 30);
}
INTDEF(__isinf)
weak_alias (__isinf, isinf)
#ifdef NO_LONG_DOUBLE
strong_alias (__isinf, __isinfl)
INTDEF(__isinfl)
weak_alias (__isinf, isinfl)
#endif
|
