e_gammal_r.cpp

来自「这是整套横扫千军3D版游戏的源码」· C++ 代码 · 共 66 行

/* See the import.pl script for potential modifications */
/* Implementation of gamma function according to ISO C.
   Copyright (C) 1997, 1999, 2001, 2003, 2004 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <[e-mail]>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1l of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include "math.h"
#include "math_private.h"


namespace streflop_libm {
Extended
__ieee754_gammal_r (Extended x, int *signgamp)
{
  /* We don't have a real gamma implementation now.  We'll use lgamma
     and the exp function.  But due to the required boundary
     conditions we must check some values separately.  */
  u_int32_t es, hx, lx;

  GET_LDOUBLE_WORDS (es, hx, lx, x);

  if (((es & 0x7fff) | hx | lx) == 0)
    {
      /* Return value for x == 0 is Inf with divide by zero exception.  */
      *signgamp = 0;
      return 1.0l / x;
    }
  if (es == 0xffffffff && ((hx & 0x7fffffff) | lx) == 0)
    {
      /* x == -Inf.  According to ISO this is NaN.  */
      *signgamp = 0;
      return x - x;
    }
  if ((es & 0x7fff) == 0x7fff && ((hx & 0x7fffffff) | lx) != 0)
    {
      /* NaN, return it.  */
      *signgamp = 0;
      return x;
    }
  if ((es & 0x8000) != 0 && x < 0xffffffff && __rintl (x) == x)
    {
      /* Return value for integer x < 0 is NaN with invalid exception.  */
      *signgamp = 0;
      return (x - x) / (x - x);
    }

  /* XXX FIXME.  */
  return __ieee754_expl (__ieee754_lgammal_r (x, signgamp));
}
}