blob: 218b745b3573552b5e7c4c8b664f3c7b3e2f7d00 (
plain) (
blame)
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
|
/* Round argument to nearest integral value according to current rounding
direction.
Copyright (C) 1997-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
The GNU C 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 GNU C 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 C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <math.h>
#include <math_private.h>
#include <libm-alias-double.h>
#include "mathimpl.h"
long long int
__llrint (double x)
{
int32_t e;
uint32_t h, l, s;
long long int result;
x = __m81_u(__rint) (x);
/* We could use __fixxfdi from libgcc, but here we can take advantage of
the known floating point format. */
EXTRACT_WORDS (h, l, x);
e = ((h >> 20) & 0x7ff) - 0x3ff;
if (e < 0)
return 0;
s = h;
h &= 0xfffff;
h |= 0x100000;
if (e < 63)
{
if (e > 52)
{
h <<= e - 52;
h |= l >> (84 - e);
l <<= e - 52;
result = ((long long int) h << 32) | l;
}
else if (e > 20)
{
l >>= 52 - e;
l |= h << (e - 20);
h >>= 52 - e;
result = ((long long int) h << 32) | l;
}
else
result = h >> (20 - e);
if (s & 0x80000000)
result = -result;
}
else
/* The number is too large or not finite. The standard leaves it
undefined what to return when the number is too large to fit in a
`long long int'. */
result = -1LL;
return result;
}
libm_alias_double (__llrint, llrint)
|
