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 #ifndef lint 14 static char rcsid[] = "$FreeBSD$"; 15 #endif 16 17 /* 18 * significand(x) computes just 19 * scalb(x, (double) -ilogb(x)), 20 * for exercising the fraction-part(F) IEEE 754-1985 test vector. 21 */ 22 23 #include "math.h" 24 #include "math_private.h" 25 26 double 27 significand(double x) 28 { 29 return __ieee754_scalb(x,(double) -ilogb(x)); 30 } 31