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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 | 4 | This file is part of the GNU C Library. |
abfbdde1 | 5 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and |
350635a5 | 6 | Jakub Jelinek <jj@ultra.linux.cz>, 1999. |
dfd2257a UD |
7 | |
8 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
9 | modify it under the terms of the GNU Lesser General Public |
10 | License as published by the Free Software Foundation; either | |
11 | version 2.1 of the License, or (at your option) any later version. | |
dfd2257a UD |
12 | |
13 | The GNU C Library is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 16 | Lesser General Public License for more details. |
dfd2257a | 17 | |
41bdb6e2 | 18 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
19 | License along with the GNU C Library; if not, see |
20 | <http://www.gnu.org/licenses/>. */ | |
dfd2257a UD |
21 | |
22 | #include <math.h> | |
23 | ||
1ed0291c | 24 | #include <math_private.h> |
dfd2257a | 25 | |
abfbdde1 | 26 | static const long double two112[2] = |
dfd2257a | 27 | { |
abfbdde1 UD |
28 | 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */ |
29 | -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */ | |
dfd2257a UD |
30 | }; |
31 | ||
dfd2257a UD |
32 | long int |
33 | __lrintl (long double x) | |
34 | { | |
abfbdde1 UD |
35 | int32_t j0; |
36 | u_int64_t i0,i1; | |
dfd2257a UD |
37 | volatile long double w; |
38 | long double t; | |
abfbdde1 | 39 | long int result; |
dfd2257a UD |
40 | int sx; |
41 | ||
abfbdde1 UD |
42 | GET_LDOUBLE_WORDS64 (i0, i1, x); |
43 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; | |
44 | sx = i0 >> 63; | |
45 | i0 &= 0x0000ffffffffffffLL; | |
46 | i0 |= 0x0001000000000000LL; | |
dfd2257a | 47 | |
abfbdde1 | 48 | if (j0 < 48) |
dfd2257a | 49 | { |
6624dbc0 UD |
50 | w = two112[sx] + x; |
51 | t = w - two112[sx]; | |
f1122ec3 | 52 | GET_LDOUBLE_WORDS64 (i0, i1, t); |
6624dbc0 UD |
53 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; |
54 | i0 &= 0x0000ffffffffffffLL; | |
55 | i0 |= 0x0001000000000000LL; | |
dfd2257a | 56 | |
6624dbc0 | 57 | result = (j0 < 0 ? 0 : i0 >> (48 - j0)); |
dfd2257a | 58 | } |
cc3fa755 | 59 | else if (j0 < (int32_t) (8 * sizeof (long int)) - 1) |
dfd2257a | 60 | { |
abfbdde1 UD |
61 | if (j0 >= 112) |
62 | result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112)); | |
dfd2257a UD |
63 | else |
64 | { | |
abfbdde1 UD |
65 | w = two112[sx] + x; |
66 | t = w - two112[sx]; | |
f1122ec3 | 67 | GET_LDOUBLE_WORDS64 (i0, i1, t); |
abfbdde1 UD |
68 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; |
69 | i0 &= 0x0000ffffffffffffLL; | |
70 | i0 |= 0x0001000000000000LL; | |
dfd2257a | 71 | |
39007ae3 UD |
72 | if (j0 == 48) |
73 | result = (long int) i0; | |
74 | else | |
75 | result = ((long int) i0 << (j0 - 48)) | (i1 >> (112 - j0)); | |
dfd2257a UD |
76 | } |
77 | } | |
78 | else | |
79 | { | |
80 | /* The number is too large. It is left implementation defined | |
81 | what happens. */ | |
82 | return (long int) x; | |
83 | } | |
84 | ||
85 | return sx ? -result : result; | |
86 | } | |
87 | ||
88 | weak_alias (__lrintl, lrintl) |