compiler/mlib/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 #ifndef lint
  17 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_gammaf.c,v 1.5 1999/08/28 00:07:02 peter Exp $";
  18 #endif
  19
  20 #include "math.h"
  21 #include "math_private.h"
  22
  23 extern int signgam;
  24
  25 #ifdef __STDC__
  26         float gammaf(float x)
  27 #else
  28         float gammaf(x)
  29         float x;
  30 #endif
  31 {
  32 #ifdef _IEEE_LIBM
  33         return __ieee754_gammaf_r(x,&signgam);
  34 #else
  35         float y;
  36         y = __ieee754_gammaf_r(x,&signgam);
  37         if(_LIB_VERSION == _IEEE_) return y;
  38         if(!finitef(y)&&finitef(x)) {
  39             if(floorf(x)==x&&x<=(float)0.0)
  40                 /* gammaf pole */
  41                 return (float)__kernel_standard((double)x,(double)x,141);
  42             else
  43                 /* gammaf overflow */
  44                 return (float)__kernel_standard((double)x,(double)x,140);
  45         } else
  46             return y;
  47 #endif
  48 }