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 1.4 1997/10/09 11:32:19 lukem 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 #ifdef __STDC__ 20 int isinf(double x) 21 #else 22 int isinf(x) 23 double x; 24 #endif 25 { 26 int32_t hx,lx; 27 EXTRACT_WORDS(hx,lx,x); 28 hx &= 0x7fffffff; 29 hx ^= 0x7ff00000; 30 hx |= lx; 31 return (hx == 0); 32 } 33