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