1 2 /* @(#)s_signif.c 5.1 93/09/24 */ 3 /* 4 * ==================================================== 5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 6 * 7 * Developed at SunPro, a Sun Microsystems, Inc. business. 8 * Permission to use, copy, modify, and distribute this 9 * software is freely granted, provided that this notice 10 * is preserved. 11 * ==================================================== 12 */ 13 14 /* 15 * significand(x) computes just 16 * scalb(x, (double) -ilogb(x)), 17 * for exercising the fraction-part(F) IEEE 754-1985 test vector. 18 */ 19 20 #include "fdlibm.h" 21 22 #ifndef _DOUBLE_IS_32BITS 23 24 #ifdef __STDC__ significand(double x)25 double significand(double x) 26 #else 27 double significand(x) 28 double x; 29 #endif 30 { 31 return __ieee754_scalb(x,(double) -ilogb(x)); 32 } 33 34 #endif /* _DOUBLE_IS_32BITS */ 35