math/w_tgammaf_compat.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 <errno.h>
  17 #include <math.h>
  18 #include <math_private.h>
  19 #include <math-svid-compat.h>
  20
  21 float
  22 __tgammaf(float x)
  23 {
  24         int local_signgam;
  25         float y = __ieee754_gammaf_r(x,&local_signgam);
  26
  27         if(__glibc_unlikely (!isfinite (y) || y == 0)
  28            && (isfinite (x) || (isinf (x) && x < 0.0))
  29            && _LIB_VERSION != _IEEE_) {
  30           if (x == (float)0.0)
  31             /* tgammaf pole */
  32             return __kernel_standard_f(x, x, 150);
  33           else if(__floorf(x)==x&&x<0.0f)
  34             /* tgammaf domain */
  35             return __kernel_standard_f(x, x, 141);
  36           else if (y == 0)
  37             /* tgammaf underflow */
  38             __set_errno (ERANGE);
  39           else
  40             /* tgammaf overflow */
  41             return __kernel_standard_f(x, x, 140);
  42         }
  43         return local_signgam < 0 ? - y : y;
  44 }
  45 weak_alias (__tgammaf, tgammaf)