1 /* Shift unaligned word read Generic C version.
2 Copyright (C) 2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
19 #ifndef _STRING_SHIFT_H
20 #define _STRING_SHIFT_H 1
25 #include <string-fza.h>
27 /* Return the mask WORD shifted based on S_INT address value, to ignore
28 values not presented in the aligned word read. */
29 static __always_inline find_t
30 shift_find (find_t word
, uintptr_t s
)
32 if (__BYTE_ORDER
== __LITTLE_ENDIAN
)
33 return word
>> (CHAR_BIT
* (s
% sizeof (op_t
)));
35 return word
<< (CHAR_BIT
* (s
% sizeof (op_t
)));
38 /* Mask off the bits defined for the S alignment value, or return WORD if
40 static __always_inline find_t
41 shift_find_last (find_t word
, uintptr_t s
)
43 s
= s
% sizeof (op_t
);
46 if (__BYTE_ORDER
== __LITTLE_ENDIAN
)
47 return word
& ~(((op_t
)-1) << (s
* CHAR_BIT
));
49 return word
& ~(((op_t
)-1) >> (s
* CHAR_BIT
));
52 #endif /* _STRING_SHIFT_H */