1/* mpfr_stack -- initialize a floating-point number with given allocation area
2
3Copyright 2005, 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#include "mpfr-impl.h"
24
25#undef mpfr_custom_get_size
26size_t
27mpfr_custom_get_size (mpfr_prec_t prec)
28{
29  return MPFR_PREC2LIMBS (prec) * BYTES_PER_MP_LIMB;
30}
31
32#undef mpfr_custom_init
33void
34mpfr_custom_init (void *mantissa, mpfr_prec_t prec)
35{
36  return ;
37}
38
39#undef mpfr_custom_get_significand
40void *
41mpfr_custom_get_significand (mpfr_srcptr x)
42{
43  return (void*) MPFR_MANT (x);
44}
45
46#undef mpfr_custom_get_exp
47mpfr_exp_t
48mpfr_custom_get_exp (mpfr_srcptr x)
49{
50  return MPFR_EXP (x);
51}
52
53#undef mpfr_custom_move
54void
55mpfr_custom_move (mpfr_ptr x, void *new_position)
56{
57  MPFR_MANT (x) = (mp_limb_t *) new_position;
58}
59
60#undef mpfr_custom_init_set
61void
62mpfr_custom_init_set (mpfr_ptr x, int kind, mpfr_exp_t exp,
63                     mpfr_prec_t prec, void *mantissa)
64{
65  mpfr_kind_t t;
66  int s;
67  mpfr_exp_t e;
68
69  if (kind >= 0)
70    {
71      t = (mpfr_kind_t) kind;
72      s = MPFR_SIGN_POS;
73    }
74  else
75    {
76      t = (mpfr_kind_t) -kind;
77      s = MPFR_SIGN_NEG;
78    }
79  MPFR_ASSERTD (t <= MPFR_REGULAR_KIND);
80  e = MPFR_LIKELY (t == MPFR_REGULAR_KIND) ? exp :
81    MPFR_UNLIKELY (t == MPFR_NAN_KIND) ? MPFR_EXP_NAN :
82    MPFR_UNLIKELY (t == MPFR_INF_KIND) ? MPFR_EXP_INF : MPFR_EXP_ZERO;
83
84  MPFR_PREC (x) = prec;
85  MPFR_SET_SIGN (x, s);
86  MPFR_EXP (x) = e;
87  MPFR_MANT (x) = (mp_limb_t*) mantissa;
88  return;
89}
90
91#undef mpfr_custom_get_kind
92int
93mpfr_custom_get_kind (mpfr_srcptr x)
94{
95  if (MPFR_LIKELY (!MPFR_IS_SINGULAR (x)))
96    return (int) MPFR_REGULAR_KIND * MPFR_INT_SIGN (x);
97  if (MPFR_IS_INF (x))
98    return (int) MPFR_INF_KIND * MPFR_INT_SIGN (x);
99  if (MPFR_IS_NAN (x))
100    return (int) MPFR_NAN_KIND;
101  MPFR_ASSERTD (MPFR_IS_ZERO (x));
102  return (int) MPFR_ZERO_KIND * MPFR_INT_SIGN (x);
103}
104
105