sysdeps/libm-ieee754/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=  1.135652340629414394949193107797076489134e4,
  34   /* 0x400C, 0xB17217F7, 0xD1CF79AC */
  35 u_threshold= -1.140019167866942050398521670162263001513e4;
  36   /* 0x400C, 0xB220C447, 0x69C201E8 */
  37
  38 #ifdef __STDC__
  39         long double __expl(long double x)       /* wrapper exp */
  40 #else
  41         long double __expl(x)                   /* wrapper exp */
  42         long double x;
  43 #endif
  44 {
  45 #ifdef _IEEE_LIBM
  46         return __ieee754_expl(x);
  47 #else
  48         long double z;
  49         z = __ieee754_expl(x);
  50         if(_LIB_VERSION == _IEEE_) return z;
  51         if(__finitel(x)) {
  52             if(x>o_threshold)
  53                 return __kernel_standard(x,x,206); /* exp overflow */
  54             else if(x<u_threshold)
  55                 return __kernel_standard(x,x,207); /* exp underflow */
  56         }
  57         return z;
  58 #endif
  59 }
  60 weak_alias (__expl, expl)