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_mul_2si -- multiply a floating-point number by a power of two
Copyright 1999, 2001, 2002, 2003 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 "gmp.h"
#include "gmp-impl.h"
#include "mpfr.h"
#include "mpfr-impl.h"
int
mpfr_mul_2si (mpfr_ptr y, mpfr_srcptr x, long int n, mp_rnd_t rnd_mode)
{
int inexact;
inexact = y != x ? mpfr_set (y, x, rnd_mode) : 0;
if (MPFR_IS_FP(y) && MPFR_NOTZERO(y))
{
mp_exp_t exp = MPFR_GET_EXP (y);
if (n > 0 && (__gmpfr_emax < MPFR_EMIN_MIN + n ||
exp > __gmpfr_emax - n))
return mpfr_set_overflow (y, rnd_mode, MPFR_SIGN(y));
if (n < 0 && (__gmpfr_emin > MPFR_EMAX_MAX + n ||
exp < __gmpfr_emin - n))
{
if (rnd_mode == GMP_RNDN &&
(__gmpfr_emin > MPFR_EMAX_MAX + (n + 1) ||
exp < __gmpfr_emin - (n + 1) || mpfr_powerof2_raw (y)))
rnd_mode = GMP_RNDZ;
return mpfr_set_underflow (y, rnd_mode, MPFR_SIGN(y));
}
MPFR_SET_EXP (y, exp + n);
}
return inexact;
}
|
