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dfd2257a | 1 | /* Round long double value to long int. |
d4697bc9 | 2 | Copyright (C) 1997-2014 Free Software Foundation, Inc. |
dfd2257a UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 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. | |
dfd2257a 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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
dfd2257a | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
dfd2257a UD |
19 | |
20 | #include <math.h> | |
21 | ||
1ed0291c | 22 | #include <math_private.h> |
dfd2257a UD |
23 | |
24 | ||
25 | long int | |
26 | __lroundl (long double x) | |
27 | { | |
28 | int32_t j0; | |
29 | u_int32_t se, i1, i0; | |
30 | long int result; | |
31 | int sign; | |
32 | ||
33 | GET_LDOUBLE_WORDS (se, i0, i1, x); | |
34 | j0 = (se & 0x7fff) - 0x3fff; | |
35 | sign = (se & 0x8000) != 0 ? -1 : 1; | |
36 | ||
37 | if (j0 < 31) | |
38 | { | |
39 | if (j0 < 0) | |
40 | return j0 < -1 ? 0 : sign; | |
41 | else | |
42 | { | |
43 | u_int32_t j = i0 + (0x40000000 >> j0); | |
44 | if (j < i0) | |
45 | { | |
46 | j >>= 1; | |
47 | j |= 0x80000000; | |
48 | ++j0; | |
49 | } | |
50 | ||
51 | result = j >> (31 - j0); | |
52 | } | |
53 | } | |
cc3fa755 | 54 | else if (j0 < (int32_t) (8 * sizeof (long int)) - 1) |
dfd2257a UD |
55 | { |
56 | if (j0 >= 63) | |
57 | result = ((long int) i0 << (j0 - 31)) | (i1 << (j0 - 63)); | |
58 | else | |
59 | { | |
60 | u_int32_t j = i1 + (0x80000000 >> (j0 - 31)); | |
61 | if (j < i1) | |
62 | ++i0; | |
63 | ||
3eb61415 UD |
64 | if (j0 == 31) |
65 | result = (long int) i0; | |
66 | else | |
67 | result = ((long int) i0 << (j0 - 31)) | (j >> (63 - j0)); | |
dfd2257a UD |
68 | } |
69 | } | |
70 | else | |
71 | { | |
72 | /* The number is too large. It is left implementation defined | |
73 | what happens. */ | |
74 | return (long int) x; | |
75 | } | |
76 | ||
77 | return sign * result; | |
78 | } | |
79 | ||
80 | weak_alias (__lroundl, lroundl) |