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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/* mpf_div_ui -- Divide a float with an unsigned integer.
Copyright 1993, 1994, 1996, 2000-2002, 2004, 2005, 2012 Free Software
Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP 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 MP 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 MP Library. If not, see https://www.gnu.org/licenses/. */
#include "gmp.h"
#include "gmp-impl.h"
#include "longlong.h"
void
mpf_div_ui (mpf_ptr r, mpf_srcptr u, unsigned long int v)
{
mp_srcptr up;
mp_ptr rp, tp, rtp;
mp_size_t usize;
mp_size_t rsize, tsize;
mp_size_t sign_quotient;
mp_size_t prec;
mp_limb_t q_limb;
mp_exp_t rexp;
TMP_DECL;
#if BITS_PER_ULONG > GMP_NUMB_BITS /* avoid warnings about shift amount */
if (v > GMP_NUMB_MAX)
{
mpf_t vf;
mp_limb_t vl[2];
SIZ(vf) = 2;
EXP(vf) = 2;
PTR(vf) = vl;
vl[0] = v & GMP_NUMB_MASK;
vl[1] = v >> GMP_NUMB_BITS;
mpf_div (r, u, vf);
return;
}
#endif
if (UNLIKELY (v == 0))
DIVIDE_BY_ZERO;
usize = u->_mp_size;
if (usize == 0)
{
r->_mp_size = 0;
r->_mp_exp = 0;
return;
}
sign_quotient = usize;
usize = ABS (usize);
prec = r->_mp_prec;
TMP_MARK;
rp = r->_mp_d;
up = u->_mp_d;
tsize = 1 + prec;
tp = TMP_ALLOC_LIMBS (tsize + 1);
if (usize > tsize)
{
up += usize - tsize;
usize = tsize;
rtp = tp;
}
else
{
MPN_ZERO (tp, tsize - usize);
rtp = tp + (tsize - usize);
}
/* Move the dividend to the remainder. */
MPN_COPY (rtp, up, usize);
mpn_divmod_1 (rp, tp, tsize, (mp_limb_t) v);
q_limb = rp[tsize - 1];
rsize = tsize - (q_limb == 0);
rexp = u->_mp_exp - (q_limb == 0);
r->_mp_size = sign_quotient >= 0 ? rsize : -rsize;
r->_mp_exp = rexp;
TMP_FREE;
}
|