1 /* 2 * Written by J.T. Conklin <jtc@netbsd.org>. 3 * Public domain. 4 */ 5 6 #include <sys/cdefs.h> 7 #if defined(LIBM_SCCS) && !defined(lint) 8 __RCSID("$NetBSD: s_isinff.c,v 1.5 2002/05/26 22:01:56 wiz Exp $"); 9 #endif 10 11 /* 12 * isinff(x) returns 1 is x is inf, else 0; 13 * no branching! 14 */ 15 16 #include "math.h" 17 #include "math_private.h" 18 19 int 20 isinff(float x) 21 { 22 int32_t ix; 23 GET_FLOAT_WORD(ix,x); 24 ix &= 0x7fffffff; 25 ix ^= 0x7f800000; 26 return (ix == 0); 27 } 28