sysdeps/libm-ieee754/w_exp10.c

   1 /* @(#)w_exp10.c
   2  * Conversion to exp10 by Ulrich Drepper <drepper@cygnus.com>.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 /*
  17  * wrapper exp10(x)
  18  */
  19
  20 #include "math.h"
  21 #include "math_private.h"
  22
  23 #ifdef __STDC__
  24 static const double
  25 #else
  26 static double
  27 #endif
  28 o_threshold=  3.0825471555991674389672e+02,
  29 u_threshold= -3.2360724533877978485251e+02;
  30
  31 #ifdef __STDC__
  32         double __exp10(double x)                /* wrapper exp10 */
  33 #else
  34         double __exp10(x)                       /* wrapper exp10 */
  35         double x;
  36 #endif
  37 {
  38 #ifdef _IEEE_LIBM
  39         return __ieee754_exp10(x);
  40 #else
  41         double z;
  42         z = __ieee754_exp10(x);
  43         if(_LIB_VERSION == _IEEE_) return z;
  44         if(__finite(x)) {
  45             if(x>o_threshold)
  46                 return __kernel_standard(x,x,46); /* exp10 overflow */
  47             else if(x<u_threshold)
  48                 return __kernel_standard(x,x,47); /* exp10 underflow */
  49         }
  50         return z;
  51 #endif
  52 }
  53 weak_alias (__exp10, exp10)
  54 strong_alias (__exp10, __pow10)
  55 weak_alias (__pow10, pow10)
  56 #ifdef NO_LONG_DOUBLE
  57 strong_alias (__exp10, __exp10l)
  58 weak_alias (__exp10, exp10l)
  59 strong_alias (__exp10l, __pow10l)
  60 weak_alias (__pow10l, pow10l)
  61 #endif