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_isinff.c,v 1.3 1995/05/11 23:20:21 jtc Exp $"; 8 #endif 9 10 /* 11 * isinff(x) returns 1 if x is inf, -1 if x is -inf, else 0; 12 * no branching! 13 */ 14 15 #include "math.h" 16 #include "math_private.h" 17 18 int 19 __isinff (float x) 20 { 21 int32_t ix,t; 22 GET_FLOAT_WORD(ix,x); 23 t = ix & 0x7fffffff; 24 t ^= 0x7f800000; 25 t |= -t; 26 return ~(t >> 31) & (ix >> 30); 27 } 28 hidden_def (__isinff) 29 weak_alias (__isinff, isinff) 30