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_cmp_d -- compare a floating-point number with a long double
Copyright 2004, 2006-2019 Free Software Foundation, Inc.
Contributed by the AriC 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/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <float.h> /* needed so that MPFR_LDBL_MANT_DIG is correctly defined */
#include "mpfr-impl.h"
int
mpfr_cmp_ld (mpfr_srcptr b, long double d)
{
mpfr_t tmp;
int res;
MPFR_SAVE_EXPO_DECL (expo);
MPFR_SAVE_EXPO_MARK (expo);
mpfr_init2 (tmp, MPFR_LDBL_MANT_DIG);
res = mpfr_set_ld (tmp, d, MPFR_RNDN);
if (res != 0) /* can happen when "long double" is double-double */
{
/* since the smallest value is 2^(-1074) and the largest is
< 2^1024, every double-double is exactly representable with
1024 + 1074 bits */
mpfr_set_prec (tmp, 1024 + 1074);
res = mpfr_set_ld (tmp, d, MPFR_RNDN);
}
MPFR_ASSERTD (res == 0);
MPFR_CLEAR_FLAGS ();
res = mpfr_cmp (b, tmp);
MPFR_SAVE_EXPO_UPDATE_FLAGS (expo, __gmpfr_flags);
mpfr_clear (tmp);
MPFR_SAVE_EXPO_FREE (expo);
return res;
}
|
