1 | /* Round argument to nearest integral value according to current rounding |
2 | direction. |
3 | Copyright (C) 1997-2024 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 |
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) (mathop_x: 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 | |