math/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 #ifdef __STDC__
  24         float __lgammaf(float x)
  25 #else
  26         float __lgammaf(x)
  27         float x;
  28 #endif
  29 {
  30 #ifdef _IEEE_LIBM
  31         return __ieee754_lgammaf_r(x,&signgam);
  32 #else
  33         float y;
  34         int local_signgam;
  35         y = __ieee754_lgammaf_r(x,&local_signgam);
  36         if (_LIB_VERSION != _ISOC_)
  37           /* ISO C99 does not define the global variable.  */
  38           signgam = local_signgam;
  39         if(_LIB_VERSION == _IEEE_) return y;
  40         if(!__finitef(y)&&__finitef(x)) {
  41             if(__floorf(x)==x&&x<=(float)0.0)
  42                 /* lgamma pole */
  43                 return (float)__kernel_standard((double)x,(double)x,115);
  44             else
  45                 /* lgamma overflow */
  46                 return (float)__kernel_standard((double)x,(double)x,114);
  47         } else
  48             return y;
  49 #endif
  50 }
  51 weak_alias (__lgammaf, lgammaf)
  52 strong_alias (__lgammaf, __gammaf)
  53 weak_alias (__gammaf, gammaf)