sysdeps/libm-ieee754/w_exp10f.c

   1 /* w_exp10f.c -- float version of 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 expf10(x)
  18  */
  19
  20 #include "math.h"
  21 #include "math_private.h"
  22
  23 #ifdef __STDC__
  24 static const float
  25 #else
  26 static float
  27 #endif
  28 o_threshold=  3.853183944498959298709e+01,
  29 u_threshold= -4.515449934959717928174e+01;
  30
  31 #ifdef __STDC__
  32         float __exp10f(float x)         /* wrapper exp10f */
  33 #else
  34         float __exp10f(x)                       /* wrapper exp10f */
  35         float x;
  36 #endif
  37 {
  38 #ifdef _IEEE_LIBM
  39         return __ieee754_exp10f(x);
  40 #else
  41         float z;
  42         z = __ieee754_exp10f(x);
  43         if(_LIB_VERSION == _IEEE_) return z;
  44         if(__finitef(x)) {
  45             if(x>o_threshold)
  46                 /* exp overflow */
  47                 return (float)__kernel_standard((double)x,(double)x,146);
  48             else if(x<u_threshold)
  49                 /* exp underflow */
  50                 return (float)__kernel_standard((double)x,(double)x,147);
  51         }
  52         return z;
  53 #endif
  54 }
  55 weak_alias (__exp10f, exp10f)
  56 strong_alias (__exp10f, __pow10f)
  57 weak_alias (__pow10f, pow10f)