1 /*
2  * Public domain.
3  */
4 
5 #if defined(LIBM_SCCS) && !defined(lint)
6 static char rcsid[] = "$NetBSD: s_isinff.c,v 1.3 1995/05/11 23:20:21 jtc Exp $";
7 #endif
8 
9 /*
10  * isinff(x) returns 1 if x is inf, -1 if x is -inf, else 0;
11  * no branching!
12  */
13 
14 #include <math.h>
15 #include <math_private.h>
16 
17 int
__isinff(float x)18 __isinff (float x)
19 {
20 	int32_t ix,t;
21 	GET_FLOAT_WORD(ix,x);
22 	t = ix & 0x7fffffff;
23 	t ^= 0x7f800000;
24 	t |= -t;
25 	return ~(t >> 31) & (ix >> 30);
26 }
27 hidden_def (__isinff)
28 weak_alias (__isinff, isinff)
29