blob: f6591c0f25a6b00a7562bbd393b4a121dc0616e9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/* mpfr_set_prec -- reset the precision of a floating-point number
Copyright (C) 1999, 2001 Free Software Foundation, Inc.
This file is part of the MPFR Library.
The 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 2.1 of the License, or (at your
option) any later version.
The 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 MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "mpfr.h"
#include "mpfr-impl.h"
int
mpfr_set_prec (mpfr_ptr x, mp_prec_t p)
{
mp_size_t xsize;
MPFR_ASSERTN(p >= MPFR_PREC_MIN && p <= MPFR_PREC_MAX);
xsize = (p - 1) / BITS_PER_MP_LIMB + 1; /* new limb size */
if (xsize > MPFR_ABSSIZE(x))
{
MPFR_MANT(x) = (mp_ptr) (*__gmp_reallocate_func)
(MPFR_MANT(x), (size_t) MPFR_ABSSIZE(x) * BYTES_PER_MP_LIMB,
(size_t) xsize * BYTES_PER_MP_LIMB);
MPFR_SIZE(x) = xsize; /* new number of allocated limbs */
}
MPFR_PREC(x) = p;
MPFR_SET_NAN(x); /* initializes to NaN */
return MPFR_MANT(x) == NULL;
}
mp_prec_t
mpfr_get_prec (mpfr_srcptr x)
{
return MPFR_PREC(x);
}
|
