1 /* 2 * Written by J.T. Conklin <jtc@netbsd.org>. 3 * Public domain. 4 */ 5 6 #if defined(LIBM_SCCS) && !defined(lint) 7 static char rcsid[] = "$NetBSD: s_isinf.c,v 1.3 1995/05/11 23:03:44 jtc Exp $"; 8 #endif 9 10 /* 11 * isinf(x) returns 1 is x is inf, else 0; 12 * no branching! 13 */ 14 15 #include "math.h" 16 #include "math_private.h" 17 18 #ifdef __STDC__ 19 int isinf(double x) 20 #else 21 int isinf(x) 22 double x; 23 #endif 24 { 25 int32_t hx,lx; 26 EXTRACT_WORDS(hx,lx,x); 27 hx &= 0x7fffffff; 28 hx ^= 0x7ff00000; 29 hx |= lx; 30 return (hx == 0); 31 } 32