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