sysdeps/libm-ieee754/e_scalbl.c

   1 /* e_scalbl.c -- long double version of s_scalb.c.
   2  * Conversion to long double by Ulrich Drepper,
   3  * Cygnus Support, drepper@cygnus.com.
   4  */
   5
   6 /*
   7  * ====================================================
   8  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   9  *
  10  * Developed at SunPro, a Sun Microsystems, Inc. business.
  11  * Permission to use, copy, modify, and distribute this
  12  * software is freely granted, provided that this notice
  13  * is preserved.
  14  * ====================================================
  15  */
  16
  17 #if defined(LIBM_SCCS) && !defined(lint)
  18 static char rcsid[] = "$NetBSD: $";
  19 #endif
  20
  21 /*
  22  * __ieee754_scalbl(x, fn) is provide for
  23  * passing various standard test suite. One
  24  * should use scalbnl() instead.
  25  */
  26
  27 #include "math.h"
  28 #include "math_private.h"
  29
  30 #ifdef _SCALB_INT
  31 #ifdef __STDC__
  32         long double __ieee754_scalbl(long double x, int fn)
  33 #else
  34         long double __ieee754_scalbl(x,fn)
  35         long double x; int fn;
  36 #endif
  37 #else
  38 #ifdef __STDC__
  39         long double __ieee754_scalbl(long double x, long double fn)
  40 #else
  41         long double __ieee754_scalbl(x,fn)
  42         long double x, fn;
  43 #endif
  44 #endif
  45 {
  46 #ifdef _SCALB_INT
  47         return __scalbnl(x,fn);
  48 #else
  49         if (__isnanl(x)||__isnanl(fn)) return x*fn;
  50         if (!__finitel(fn)) {
  51             if(fn>0.0) return x*fn;
  52             else if (x == 0)
  53               return x;
  54             else if (!__finitel (x))
  55               return __nanl ("");
  56             else       return x/(-fn);
  57         }
  58         if (__rintl(fn)!=fn) return __nanl ("");
  59         if ( fn > 65000.0) return __scalbnl(x, 65000);
  60         if (-fn > 65000.0) return __scalbnl(x,-65000);
  61         return __scalbnl(x,(int)fn);
  62 #endif
  63 }