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 #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 __tgammaf(float x)
  25 #else
  26         float __tgammaf(x)
  27         float x;
  28 #endif
  29 {
  30         float y;
  31         int local_signgam;
  32         y = __ieee754_gammaf_r(x,&local_signgam);
  33         if (local_signgam < 0) y = -y;
  34 #ifdef _IEEE_LIBM
  35         return y;
  36 #else
  37         if(_LIB_VERSION == _IEEE_) return y;
  38
  39         if(!__finitef(y)&&__finitef(x)) {
  40           if (x == (float)0.0)
  41             /* tgammaf pole */
  42             return (float)__kernel_standard((double)x,(double)x,150);
  43           else if(__floorf(x)==x&&x<(float)0.0)
  44             /* tgammaf domain */
  45             return (float)__kernel_standard((double)x,(double)x,141);
  46           else
  47             /* tgammaf overflow */
  48             return (float)__kernel_standard((double)x,(double)x,140);
  49         }
  50         return y;
  51 #endif
  52 }
  53 weak_alias (__tgammaf, tgammaf)