niceSOFT/mpfr | Gitverse

src/minmax.c
91 строка2 KB
Vincent Lefevre
Updated the "Contributed" lines.
02 фев 2025, 02:39
02 фев 2025, 02:39a774f60
/* mpfr_min -- min and max of x, y

Copyright 2001, 2003-2004, 2006-2025 Free Software Foundation, Inc.
Contributed by the Pascaline and Caramba projects, INRIA.

This file is part of the GNU MPFR Library.

The GNU MPFR 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 3 of the License, or (at your
option) any later version.

The GNU MPFR 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 MPFR Library; see the file COPYING.LESSER.
If not, see <https://www.gnu.org/licenses/>. */


#include "mpfr-impl.h"

 /* The computation of z=min(x,y)

    z=x if x <= y
    z=y if x > y
 */

int
mpfr_min (mpfr_ptr z, mpfr_srcptr x, mpfr_srcptr y, mpfr_rnd_t rnd_mode)
{
  if (MPFR_ARE_SINGULAR(x,y))
    {
      if (MPFR_IS_NAN(x) && MPFR_IS_NAN(y) )
        {
          MPFR_SET_NAN(z);
          MPFR_RET_NAN;
        }
      else if (MPFR_IS_NAN(x))
        return mpfr_set(z, y, rnd_mode);
      else if (MPFR_IS_NAN(y))
        return mpfr_set(z, x, rnd_mode);
      else if (MPFR_IS_ZERO(x) && MPFR_IS_ZERO(y))
        {
          if (MPFR_IS_NEG(x))
            return mpfr_set(z, x, rnd_mode);
          else
            return mpfr_set(z, y, rnd_mode);
        }
    }
  if (mpfr_cmp(x,y) <= 0)
    return mpfr_set(z, x, rnd_mode);
  else
    return mpfr_set(z, y, rnd_mode);
}

 /* The computation of z=max(x,y)

    z=x if x >= y
    z=y if x < y
 */

int
mpfr_max (mpfr_ptr z, mpfr_srcptr x, mpfr_srcptr y, mpfr_rnd_t rnd_mode)
{
  if (MPFR_ARE_SINGULAR(x,y))
    {
      if (MPFR_IS_NAN(x) && MPFR_IS_NAN(y) )
        {
          MPFR_SET_NAN(z);
          MPFR_RET_NAN;
        }
      else if (MPFR_IS_NAN(x))
        return mpfr_set(z, y, rnd_mode);
      else if (MPFR_IS_NAN(y))
        return mpfr_set(z, x, rnd_mode);
      else if (MPFR_IS_ZERO(x) && MPFR_IS_ZERO(y))
        {
          if (MPFR_IS_NEG(x))
            return mpfr_set(z, y, rnd_mode);
          else
            return mpfr_set(z, x, rnd_mode);
        }
    }
  if (mpfr_cmp(x,y) <= 0)
    return mpfr_set(z, y, rnd_mode);
  else
    return mpfr_set(z, x, rnd_mode);
}