00001 /* @(#)s_signif.c 5.1 93/09/24 */ 00002 /* 00003 * ==================================================== 00004 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 00005 * 00006 * Developed at SunPro, a Sun Microsystems, Inc. business. 00007 * Permission to use, copy, modify, and distribute this 00008 * software is freely granted, provided that this notice 00009 * is preserved. 00010 * ==================================================== 00011 */ 00012 00013 #if defined(LIBM_SCCS) && !defined(lint) 00014 static char rcsid[] = "$NetBSD: s_significand.c,v 1.6 1995/05/10 20:48:11 jtc Exp $"; 00015 #endif 00016 00017 /* 00018 * significand(x) computes just 00019 * scalb(x, (double) -ilogb(x)), 00020 * for exercising the fraction-part(F) IEEE 754-1985 test vector. 00021 */ 00022 00023 #include "math.h" 00024 #include "mathP.h" 00025 00026 #ifdef __STDC__ 00027 double significand(double x) 00028 #else 00029 double significand(x) 00030 double x; 00031 #endif 00032 { 00033 return __ieee754_scalb(x,(double) -ilogb(x)); 00034 }
1.3.8