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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. */
28static __always_inline find_t
29shift_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. */
35static __always_inline find_t
36shift_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 */