| /* |
| * Written by J.T. Conklin <jtc@netbsd.org>. |
| * Public domain. |
| */ |
| |
| #if defined(LIBM_SCCS) && !defined(lint) |
| static char rcsid[] = "$NetBSD: s_isinff.c,v 1.3 1995/05/11 23:20:21 jtc Exp $"; |
| #endif |
| |
| /* |
| * isinff(x) returns 1 if x is inf, -1 if x is -inf, else 0; |
| * no branching! |
| */ |
| |
| #include "math.h" |
| #include "math_private.h" |
| |
| int |
| __isinff (float x) |
| { |
| int32_t ix,t; |
| GET_FLOAT_WORD(ix,x); |
| t = ix & 0x7fffffff; |
| t ^= 0x7f800000; |
| t |= -t; |
| return ~(t >> 31) & (ix >> 30); |
| } |
| hidden_def (__isinff) |
| weak_alias (__isinff, isinff) |
