math/w_tgammaf.c

   1 /* w_gammaf.c -- float version of w_gamma.c.
   2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@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 #include <math.h>
  17 #include <math_private.h>
  18
  19 float
  20 __tgammaf(float x)
  21 {
  22         int local_signgam;
  23         float y = __ieee754_gammaf_r(x,&local_signgam);
  24
  25         if(__builtin_expect(!__finitef(y), 0) && __finitef(x)
  26            && _LIB_VERSION != _IEEE_) {
  27           if (x == (float)0.0)
  28             /* tgammaf pole */
  29             return __kernel_standard_f(x, x, 150);
  30           else if(__floorf(x)==x&&x<0.0f)
  31             /* tgammaf domain */
  32             return __kernel_standard_f(x, x, 141);
  33           else
  34             /* tgammaf overflow */
  35             return __kernel_standard_f(x, x, 140);
  36         }
  37         return local_signgam < 0 ? - y : y;
  38 }
  39 weak_alias (__tgammaf, tgammaf)