sysdeps/libm-ieee754/w_lgammaf.c

   1 /* w_lgammaf.c -- float version of w_lgamma.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_lgammaf.c,v 1.3 1995/05/10 20:49:30 jtc Exp $";
  18 #endif
  19
  20 #include "math.h"
  21 #include "math_private.h"
  22
  23 extern int __signgam;
  24
  25 #ifdef __STDC__
  26         float __lgammaf(float x)
  27 #else
  28         float __lgammaf(x)
  29         float x;
  30 #endif
  31 {
  32 #ifdef _IEEE_LIBM
  33         return __ieee754_lgammaf_r(x,&__signgam);
  34 #else
  35         float y;
  36         y = __ieee754_lgammaf_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                 /* lgamma pole */
  41                 return (float)__kernel_standard((double)x,(double)x,115);
  42             else
  43                 /* lgamma overflow */
  44                 return (float)__kernel_standard((double)x,(double)x,114);
  45         } else
  46             return y;
  47 #endif
  48 }
  49 weak_alias (__lgammaf, lgammaf)