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_isinf.c,v 1.5 2002/05/26 22:01:56 wiz Exp $"); 9 #endif 10 11 /* 12 * isinf(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 isinf(double x) 21 { 22 int32_t hx,lx; 23 EXTRACT_WORDS(hx,lx,x); 24 hx &= 0x7fffffff; 25 hx ^= 0x7ff00000; 26 hx |= lx; 27 return (hx == 0); 28 } 29