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Commit | Line | Data |
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dfd2257a UD |
1 | /* Round argument to nearest integral value according to current rounding |
2 | direction. | |
b168057a | 3 | Copyright (C) 1997-2015 Free Software Foundation, Inc. |
dfd2257a UD |
4 | This file is part of the GNU C Library. |
5 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
6 | ||
7 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 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. | |
dfd2257a 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 | |
41bdb6e2 | 15 | Lesser General Public License for more details. |
dfd2257a | 16 | |
41bdb6e2 | 17 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
18 | License along with the GNU C Library; if not, see |
19 | <http://www.gnu.org/licenses/>. */ | |
dfd2257a UD |
20 | |
21 | #include <math.h> | |
22 | ||
1ed0291c | 23 | #include <math_private.h> |
dfd2257a UD |
24 | |
25 | static const long double two63[2] = | |
26 | { | |
27 | 9.223372036854775808000000e+18, /* 0x403E, 0x00000000, 0x00000000 */ | |
28 | -9.223372036854775808000000e+18 /* 0xC03E, 0x00000000, 0x00000000 */ | |
29 | }; | |
30 | ||
31 | ||
32 | long int | |
33 | __lrintl (long double x) | |
34 | { | |
35 | int32_t se,j0; | |
af6f3906 | 36 | u_int32_t i0, i1; |
dfd2257a UD |
37 | long int result; |
38 | volatile long double w; | |
39 | long double t; | |
40 | int sx; | |
41 | ||
42 | GET_LDOUBLE_WORDS (se, i0, i1, x); | |
43 | ||
44 | sx = (se >> 15) & 1; | |
45 | j0 = (se & 0x7fff) - 0x3fff; | |
46 | ||
47 | if (j0 < 31) | |
48 | { | |
6624dbc0 UD |
49 | w = two63[sx] + x; |
50 | t = w - two63[sx]; | |
51 | GET_LDOUBLE_WORDS (se, i0, i1, t); | |
52 | j0 = (se & 0x7fff) - 0x3fff; | |
dfd2257a | 53 | |
6624dbc0 | 54 | result = (j0 < 0 ? 0 : i0 >> (31 - j0)); |
dfd2257a | 55 | } |
cc3fa755 | 56 | else if (j0 < (int32_t) (8 * sizeof (long int)) - 1) |
dfd2257a UD |
57 | { |
58 | if (j0 >= 63) | |
59 | result = ((long int) i0 << (j0 - 31)) | (i1 << (j0 - 63)); | |
60 | else | |
61 | { | |
62 | w = two63[sx] + x; | |
63 | t = w - two63[sx]; | |
64 | GET_LDOUBLE_WORDS (se, i0, i1, t); | |
65 | j0 = (se & 0x7fff) - 0x3fff; | |
66 | ||
3eb61415 UD |
67 | if (j0 == 31) |
68 | result = (long int) i0; | |
69 | else | |
70 | result = ((long int) i0 << (j0 - 31)) | (i1 >> (63 - j0)); | |
dfd2257a UD |
71 | } |
72 | } | |
73 | else | |
74 | { | |
75 | /* The number is too large. It is left implementation defined | |
76 | what happens. */ | |
77 | return (long int) x; | |
78 | } | |
79 | ||
80 | return sx ? -result : result; | |
81 | } | |
82 | ||
83 | weak_alias (__lrintl, lrintl) |