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3f6db749 UD |
1 | /* Round argument to nearest integral value according to current rounding |
2 | direction. | |
6d7e8eda | 3 | Copyright (C) 1997-2023 Free Software Foundation, Inc. |
3f6db749 | 4 | This file is part of the GNU C Library. |
3f6db749 UD |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or | |
3214b89b AJ |
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. | |
3f6db749 UD |
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 | |
3214b89b | 14 | Lesser General Public License for more details. |
3f6db749 | 15 | |
3214b89b | 16 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff | 17 | License along with the GNU C Library. If not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
3f6db749 | 19 | |
3f6db749 | 20 | #include <math.h> |
e038d690 | 21 | #include <math_private.h> |
bd6ea9ed | 22 | #include <libm-alias-double.h> |
5da9d124 | 23 | #include "mathimpl.h" |
3f6db749 UD |
24 | |
25 | long long int | |
d391bc58 | 26 | __llrint (double x) |
3f6db749 | 27 | { |
d391bc58 | 28 | int32_t e; |
24ab7723 | 29 | uint32_t h, l, s; |
3f6db749 UD |
30 | long long int result; |
31 | ||
d391bc58 | 32 | x = __m81_u(__rint) (x); |
3f6db749 UD |
33 | |
34 | /* We could use __fixxfdi from libgcc, but here we can take advantage of | |
35 | the known floating point format. */ | |
d391bc58 | 36 | EXTRACT_WORDS (h, l, x); |
3f6db749 | 37 | |
d391bc58 UD |
38 | e = ((h >> 20) & 0x7ff) - 0x3ff; |
39 | if (e < 0) | |
40 | return 0; | |
41 | s = h; | |
42 | h &= 0xfffff; | |
43 | h |= 0x100000; | |
3f6db749 | 44 | |
d391bc58 | 45 | if (e < 63) |
3f6db749 | 46 | { |
d391bc58 UD |
47 | if (e > 52) |
48 | { | |
49 | h <<= e - 52; | |
50 | h |= l >> (84 - e); | |
51 | l <<= e - 52; | |
52 | result = ((long long int) h << 32) | l; | |
53 | } | |
54 | else if (e > 20) | |
55 | { | |
56 | l >>= 52 - e; | |
57 | l |= h << (e - 20); | |
58 | h >>= 52 - e; | |
59 | result = ((long long int) h << 32) | l; | |
60 | } | |
3f6db749 | 61 | else |
d391bc58 UD |
62 | result = h >> (20 - e); |
63 | if (s & 0x80000000) | |
3f6db749 UD |
64 | result = -result; |
65 | } | |
66 | else | |
d391bc58 UD |
67 | /* The number is too large or not finite. The standard leaves it |
68 | undefined what to return when the number is too large to fit in a | |
69 | `long long int'. */ | |
3f6db749 UD |
70 | result = -1LL; |
71 | ||
72 | return result; | |
73 | } | |
74 | ||
bd6ea9ed | 75 | libm_alias_double (__llrint, llrint) |