sysdeps/ieee754/ldbl-128/w_expl.c

   1 /* w_expl.c -- long double version of w_exp.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  * wrapper expl(x)
  23  */
  24
  25 #include "math.h"
  26 #include "math_private.h"
  27
  28 #ifdef __STDC__
  29 static const long double
  30 #else
  31 static long double
  32 #endif
  33 o_threshold= 1.1356523406294143949491931077970763428449E4L,
  34 u_threshold= -1.1433462743336297878837243843452621503410E4;
  35
  36 #ifdef __STDC__
  37         long double __expl(long double x)       /* wrapper exp */
  38 #else
  39         long double __expl(x)                   /* wrapper exp */
  40         long double x;
  41 #endif
  42 {
  43 #ifdef _IEEE_LIBM
  44         return __ieee754_expl(x);
  45 #else
  46         long double z;
  47         z = __ieee754_expl(x);
  48         if(_LIB_VERSION == _IEEE_) return z;
  49         if(__finitel(x)) {
  50             if(x>o_threshold)
  51                 return __kernel_standard(x,x,206); /* exp overflow */
  52             else if(x<u_threshold)
  53                 return __kernel_standard(x,x,207); /* exp underflow */
  54         }
  55         return z;
  56 #endif
  57 }
  58 weak_alias (__expl, expl)