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3f6db749 UD |
1 | /* Round argument to nearest integral value according to current rounding |
2 | direction. | |
688903eb | 3 | Copyright (C) 1997-2018 Free Software Foundation, Inc. |
3f6db749 UD |
4 | This file is part of the GNU C Library. |
5 | Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> | |
6 | ||
7 | The GNU C Library is free software; you can redistribute it and/or | |
3214b89b AJ |
8 | modify it under the terms of the GNU Lesser General Public |
9 | License as published by the Free Software Foundation; either | |
10 | version 2.1 of the License, or (at your option) any later version. | |
3f6db749 UD |
11 | |
12 | The GNU C Library is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
3214b89b | 15 | Lesser General Public License for more details. |
3f6db749 | 16 | |
3214b89b | 17 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff PE |
18 | License along with the GNU C Library. If not, see |
19 | <http://www.gnu.org/licenses/>. */ | |
3f6db749 | 20 | |
3f6db749 | 21 | #include <math.h> |
e038d690 | 22 | #include <math_private.h> |
bd6ea9ed | 23 | #include <libm-alias-double.h> |
5da9d124 | 24 | #include "mathimpl.h" |
3f6db749 UD |
25 | |
26 | long long int | |
d391bc58 | 27 | __llrint (double x) |
3f6db749 | 28 | { |
d391bc58 | 29 | int32_t e; |
24ab7723 | 30 | uint32_t h, l, s; |
3f6db749 UD |
31 | long long int result; |
32 | ||
d391bc58 | 33 | x = __m81_u(__rint) (x); |
3f6db749 UD |
34 | |
35 | /* We could use __fixxfdi from libgcc, but here we can take advantage of | |
36 | the known floating point format. */ | |
d391bc58 | 37 | EXTRACT_WORDS (h, l, x); |
3f6db749 | 38 | |
d391bc58 UD |
39 | e = ((h >> 20) & 0x7ff) - 0x3ff; |
40 | if (e < 0) | |
41 | return 0; | |
42 | s = h; | |
43 | h &= 0xfffff; | |
44 | h |= 0x100000; | |
3f6db749 | 45 | |
d391bc58 | 46 | if (e < 63) |
3f6db749 | 47 | { |
d391bc58 UD |
48 | if (e > 52) |
49 | { | |
50 | h <<= e - 52; | |
51 | h |= l >> (84 - e); | |
52 | l <<= e - 52; | |
53 | result = ((long long int) h << 32) | l; | |
54 | } | |
55 | else if (e > 20) | |
56 | { | |
57 | l >>= 52 - e; | |
58 | l |= h << (e - 20); | |
59 | h >>= 52 - e; | |
60 | result = ((long long int) h << 32) | l; | |
61 | } | |
3f6db749 | 62 | else |
d391bc58 UD |
63 | result = h >> (20 - e); |
64 | if (s & 0x80000000) | |
3f6db749 UD |
65 | result = -result; |
66 | } | |
67 | else | |
d391bc58 UD |
68 | /* The number is too large or not finite. The standard leaves it |
69 | undefined what to return when the number is too large to fit in a | |
70 | `long long int'. */ | |
3f6db749 UD |
71 | result = -1LL; |
72 | ||
73 | return result; | |
74 | } | |
75 | ||
bd6ea9ed | 76 | libm_alias_double (__llrint, llrint) |