RTAI API: base/math/s_significand.c Source File

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 }