1 /* @(#)s_signif.c 5.1 93/09/24 */ 2 /* 3 * ==================================================== 4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 5 * 6 * Developed at SunPro, a Sun Microsystems, Inc. business. 7 * Permission to use, copy, modify, and distribute this 8 * software is freely granted, provided that this notice 9 * is preserved. 10 * ==================================================== 11 */ 12 13 #include <sys/cdefs.h> 14 #if defined(LIBM_SCCS) && !defined(lint) 15 __RCSID("$NetBSD: s_significand.c,v 1.7 1997/10/09 11:33:22 lukem Exp $"); 16 #endif 17 18 /* 19 * significand(x) computes just 20 * scalb(x, (double) -ilogb(x)), 21 * for exercising the fraction-part(F) IEEE 754-1985 test vector. 22 */ 23 24 #include "math.h" 25 #include "math_private.h" 26 27 #ifdef __STDC__ 28 double significand(double x) 29 #else 30 double significand(x) 31 double x; 32 #endif 33 { 34 return __ieee754_scalb(x,(double) -ilogb(x)); 35 } 36