1/* mpfr_frexp -- convert to integral and fractional parts
2
3Copyright 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#include "mpfr-impl.h"
24
25int
26mpfr_frexp (mpfr_exp_t *exp, mpfr_ptr y, mpfr_srcptr x, mpfr_rnd_t rnd)
27{
28  int inex;
29
30  if (MPFR_UNLIKELY(MPFR_IS_SINGULAR(x)))
31    {
32      if (MPFR_IS_NAN(x))
33        {
34          MPFR_SET_NAN(y);
35          MPFR_RET_NAN; /* exp is unspecified */
36        }
37      else if (MPFR_IS_INF(x))
38        {
39          MPFR_SET_INF(y);
40          MPFR_SET_SAME_SIGN(y,x);
41          MPFR_RET(0); /* exp is unspecified */
42        }
43      else
44        {
45          MPFR_SET_ZERO(y);
46          MPFR_SET_SAME_SIGN(y,x);
47          *exp = 0;
48          MPFR_RET(0);
49        }
50    }
51
52  inex = mpfr_set (y, x, rnd);
53  *exp = MPFR_GET_EXP (y);
54  MPFR_SET_EXP (y, 0);
55  return mpfr_check_range (y, inex, rnd);
56}
57