1 /* Round argument to nearest integral value according to current rounding
2 direction.
3 Copyright (C) 1997-2022 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library. If not, see
18 <https://www.gnu.org/licenses/>. */
19
20 #include <math.h>
21 #include <math_private.h>
22 #include <libm-alias-ldouble.h>
23 #include "mathimpl.h"
24
25 long long int
__llrintl(long double x)26 __llrintl (long double x)
27 {
28 int32_t e, s;
29 uint32_t h, l;
30 long long int result;
31
32 x = __m81_u(__rintl) (x);
33
34 GET_LDOUBLE_WORDS (e, h, l, x);
35
36 s = e;
37 e = (e & 0x7fff) - 0x3fff;
38 if (e < 0)
39 return 0;
40
41 if (e < 63)
42 {
43 if (e > 31)
44 {
45 l >>= 63 - e;
46 l |= h << (e - 31);
47 h >>= 63 - e;
48 result = ((long long int) h << 32) | l;
49 }
50 else
51 result = h >> (31 - e);
52 if (s & 0x8000)
53 result = -result;
54 }
55 else
56 /* The number is too large or not finite. The standard leaves it
57 undefined what to return when the number is too large to fit in a
58 `long long int'. */
59 result = -1LL;
60
61 return result;
62 }
63
64 libm_alias_ldouble (__llrint, llrint)
65