sysdeps/libm-ieee754/w_gammaf.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 #if defined(LIBM_SCCS) && !defined(lint)
  17 static char rcsid[] = "$NetBSD: w_gammaf.c,v 1.4 1995/11/20 22:06:48 jtc Exp $";
  18 #endif
  19
  20 #include "math.h"
  21 #include "math_private.h"
  22
  23 #ifdef __STDC__
  24         float __gammaf(float x)
  25 #else
  26         float __gammaf(x)
  27         float x;
  28 #endif
  29 {
  30         int signgam;
  31         float y;
  32         if (_LIB_VERSION == _SVID_)
  33           y = __ieee754_lgammaf_r(x,&signgam);
  34         else
  35           {
  36             y = __ieee754_gammaf_r(x,&signgam);
  37             if (signgam < 0) y = -y;
  38 #ifdef _IEEE_LIBM
  39             return y;
  40 #else
  41             if(_LIB_VERSION == _IEEE_) return y;
  42           }
  43         if(!__finitef(y)&&__finitef(x)) {
  44             if(__floorf(x)==x&&x<=(float)0.0)
  45                 /* gammaf pole */
  46                 return (float)__kernel_standard((double)x,(double)x,141);
  47             else
  48                 /* gammaf overflow */
  49                 return (float)__kernel_standard((double)x,(double)x,140);
  50         } else
  51             return y;
  52 #endif
  53 }
  54 weak_alias (__gammaf, gammaf)