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
|
/* mpz_set_f (dest_integer, src_float) -- Assign DEST_INTEGER from SRC_FLOAT.
Copyright 1996, 2001 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 http://www.gnu.org/licenses/. */
#include "gmp.h"
#include "gmp-impl.h"
void
mpz_set_f (mpz_ptr w, mpf_srcptr u)
{
mp_ptr wp, up;
mp_size_t size;
mp_exp_t exp;
/* abs(u)<1 truncates to zero */
exp = EXP (u);
if (exp <= 0)
{
SIZ(w) = 0;
return;
}
MPZ_REALLOC (w, exp);
wp = PTR(w);
up = PTR(u);
size = SIZ (u);
SIZ(w) = (size >= 0 ? exp : -exp);
size = ABS (size);
if (exp > size)
{
/* pad with low zeros to get a total "exp" many limbs */
mp_size_t zeros = exp - size;
MPN_ZERO (wp, zeros);
wp += zeros;
}
else
{
/* exp<=size, trucate to the high "exp" many limbs */
up += (size - exp);
size = exp;
}
MPN_COPY (wp, up, size);
}
|
