lib/libm/src/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 #include <sys/cdefs.h>
  14 #if defined(LIBM_SCCS) && !defined(lint)
  15 __RCSID("$NetBSD: s_significand.c,v 1.8 1999/07/02 15:37:43 simonb Exp $");
  16 #endif
  17
  18 /*
  19  * significand(x) computes just
  20  *      scalb(x, (double) -ilogb(x)),
  21  * for exercising the fraction-part(F) IEEE 754-1985 test vector.
  22  */
  23
  24 #include "math.h"
  25 #include "math_private.h"
  26
  27 double
  28 significand(double x)
  29 {
  30         return __ieee754_scalb(x,(double) -ilogb(x));
  31 }