1/* mpfr_min -- min and max of x, y
2
3Copyright 2001, 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
4Contributed by the AriC and Caramel projects, INRIA.
5
6This file is part of the GNU MPFR Library.
7
8The GNU MPFR Library is free software; you can redistribute it and/or modify
9it under the terms of the GNU Lesser General Public License as published by
10the Free Software Foundation; either version 3 of the License, or (at your
11option) any later version.
12
13The GNU MPFR Library is distributed in the hope that it will be useful, but
14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
16License for more details.
17
18You should have received a copy of the GNU Lesser General Public License
19along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
20http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
2151 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
22
23
24#include "mpfr-impl.h"
25
26 /* The computation of z=min(x,y)
27
28    z=x if x <= y
29    z=y if x > y
30 */
31
32int
33mpfr_min (mpfr_ptr z, mpfr_srcptr x, mpfr_srcptr y, mpfr_rnd_t rnd_mode)
34{
35  if (MPFR_ARE_SINGULAR(x,y))
36    {
37      if (MPFR_IS_NAN(x) && MPFR_IS_NAN(y) )
38        {
39          MPFR_SET_NAN(z);
40          MPFR_RET_NAN;
41        }
42      else if (MPFR_IS_NAN(x))
43        return mpfr_set(z, y, rnd_mode);
44      else if (MPFR_IS_NAN(y))
45        return mpfr_set(z, x, rnd_mode);
46      else if (MPFR_IS_ZERO(x) && MPFR_IS_ZERO(y))
47        {
48          if (MPFR_IS_NEG(x))
49            return mpfr_set(z, x, rnd_mode);
50          else
51            return mpfr_set(z, y, rnd_mode);
52        }
53    }
54  if (mpfr_cmp(x,y) <= 0)
55    return mpfr_set(z, x, rnd_mode);
56  else
57    return mpfr_set(z, y, rnd_mode);
58}
59
60 /* The computation of z=max(x,y)
61
62    z=x if x >= y
63    z=y if x < y
64 */
65
66int
67mpfr_max (mpfr_ptr z, mpfr_srcptr x, mpfr_srcptr y, mpfr_rnd_t rnd_mode)
68{
69  if (MPFR_ARE_SINGULAR(x,y))
70    {
71      if (MPFR_IS_NAN(x) && MPFR_IS_NAN(y) )
72        {
73          MPFR_SET_NAN(z);
74          MPFR_RET_NAN;
75        }
76      else if (MPFR_IS_NAN(x))
77        return mpfr_set(z, y, rnd_mode);
78      else if (MPFR_IS_NAN(y))
79        return mpfr_set(z, x, rnd_mode);
80      else if (MPFR_IS_ZERO(x) && MPFR_IS_ZERO(y))
81        {
82          if (MPFR_IS_NEG(x))
83            return mpfr_set(z, y, rnd_mode);
84          else
85            return mpfr_set(z, x, rnd_mode);
86        }
87    }
88  if (mpfr_cmp(x,y) <= 0)
89    return mpfr_set(z, y, rnd_mode);
90  else
91    return mpfr_set(z, x, rnd_mode);
92}
93