lib/libm/src/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 #include <sys/cdefs.h>
  17 #if defined(LIBM_SCCS) && !defined(lint)
  18 __RCSID("$NetBSD: w_gammaf.c,v 1.8 2002/05/26 22:02:01 wiz Exp $");
  19 #endif
  20
  21 #include "math.h"
  22 #include "math_private.h"
  23
  24 float
  25 gammaf(float x)
  26 {
  27 #ifdef _IEEE_LIBM
  28         return __ieee754_lgammaf_r(x,&signgam);
  29 #else
  30         float y;
  31         y = __ieee754_lgammaf_r(x,&signgam);
  32         if(_LIB_VERSION == _IEEE_) return y;
  33         if(!finitef(y)&&finitef(x)) {
  34             if(floorf(x)==x&&x<=(float)0.0)
  35                 /* gammaf pole */
  36                 return (float)__kernel_standard((double)x,(double)x,141);
  37             else
  38                 /* gammaf overflow */
  39                 return (float)__kernel_standard((double)x,(double)x,140);
  40         } else
  41             return y;
  42 #endif
  43 }