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120ad6ed | 1 | /* Shift unaligned word read. Alpha version. |
dff8da6b | 2 | Copyright (C) 2023-2024 Free Software Foundation, Inc. |
120ad6ed RH |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #ifndef _STRING_SHIFT_H | |
20 | #define _STRING_SHIFT_H 1 | |
21 | ||
22 | #include <limits.h> | |
23 | #include <stdint.h> | |
24 | #include <string-fza.h> | |
25 | ||
26 | /* Return the mask WORD shifted based on S_INT address value, to ignore | |
27 | values not presented in the aligned word read. */ | |
28 | static __always_inline find_t | |
29 | shift_find (find_t word, uintptr_t s) | |
30 | { | |
31 | return word >> (s % sizeof (op_t)); | |
32 | } | |
33 | ||
34 | /* Mask off the bits defined the the S alignment value. */ | |
35 | static __always_inline find_t | |
36 | shift_find_last (find_t word, uintptr_t s) | |
37 | { | |
38 | s = s % sizeof (op_t); | |
39 | if (s == 0) | |
40 | return word; | |
41 | return word & ~((op_t)-1 << s); | |
42 | } | |
43 | ||
44 | #endif /* _STRING_SHIFT_H */ |