math/s_significand.c

   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 #if defined(LIBM_SCCS) && !defined(lint)
  14 static char rcsid[] = "$NetBSD: s_significand.c,v 1.6 1995/05/10 20:48:11 jtc Exp $";
  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 #ifdef __STDC__
  27         double __significand(double x)
  28 #else
  29         double __significand(x)
  30         double x;
  31 #endif
  32 {
  33         return __ieee754_scalb(x,(double) -__ilogb(x));
  34 }
  35 weak_alias (__significand, significand)
  36 #ifdef NO_LONG_DOUBLE
  37 strong_alias (__significand, __significandl)
  38 weak_alias (__significand, significandl)
  39 #endif