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dfd2257a UD |
1 | /* Round argument to nearest integral value according to current rounding |
2 | direction. | |
d4697bc9 | 3 | Copyright (C) 1997-2014 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 | 24 | |
6624dbc0 | 25 | static const float two23[2] = |
dfd2257a UD |
26 | { |
27 | 8.3886080000e+06, /* 0x4B000000 */ | |
28 | -8.3886080000e+06, /* 0xCB000000 */ | |
29 | }; | |
30 | ||
31 | ||
32 | long long int | |
33 | __llrintf (float x) | |
34 | { | |
35 | int32_t j0; | |
6973fc01 | 36 | u_int32_t i0; |
dfd2257a UD |
37 | volatile float w; |
38 | float t; | |
39 | long long int result; | |
40 | int sx; | |
41 | ||
6973fc01 | 42 | GET_FLOAT_WORD (i0, x); |
dfd2257a UD |
43 | |
44 | sx = i0 >> 31; | |
45 | j0 = ((i0 >> 23) & 0xff) - 0x7f; | |
6973fc01 | 46 | i0 &= 0x7fffff; |
dfd2257a UD |
47 | i0 |= 0x800000; |
48 | ||
cc3fa755 | 49 | if (j0 < (int32_t) (sizeof (long long int) * 8) - 1) |
dfd2257a | 50 | { |
6624dbc0 | 51 | if (j0 >= 23) |
dfd2257a UD |
52 | result = (long long int) i0 << (j0 - 23); |
53 | else | |
54 | { | |
55 | w = two23[sx] + x; | |
56 | t = w - two23[sx]; | |
6973fc01 | 57 | GET_FLOAT_WORD (i0, t); |
dfd2257a | 58 | j0 = ((i0 >> 23) & 0xff) - 0x7f; |
6973fc01 UD |
59 | i0 &= 0x7fffff; |
60 | i0 |= 0x800000; | |
dfd2257a | 61 | |
6624dbc0 | 62 | result = (j0 < 0 ? 0 : i0 >> (23 - j0)); |
dfd2257a UD |
63 | } |
64 | } | |
65 | else | |
66 | { | |
67 | /* The number is too large. It is left implementation defined | |
68 | what happens. */ | |
69 | return (long long int) x; | |
70 | } | |
71 | ||
72 | return sx ? -result : result; | |
73 | } | |
74 | ||
75 | weak_alias (__llrintf, llrintf) |