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/* Shift unaligned word read Generic C version.
Copyright (C) 2023-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _STRING_SHIFT_H
#define _STRING_SHIFT_H 1
#include <endian.h>
#include <limits.h>
#include <stdint.h>
#include <string-fza.h>
/* Return the mask WORD shifted based on S_INT address value, to ignore
values not presented in the aligned word read. */
static __always_inline find_t
shift_find (find_t word, uintptr_t s)
{
if (__BYTE_ORDER == __LITTLE_ENDIAN)
return word >> (CHAR_BIT * (s % sizeof (op_t)));
else
return word << (CHAR_BIT * (s % sizeof (op_t)));
}
/* Mask off the bits defined for the S alignment value, or return WORD if
S is 0. */
static __always_inline find_t
shift_find_last (find_t word, uintptr_t s)
{
s = s % sizeof (op_t);
if (s == 0)
return word;
if (__BYTE_ORDER == __LITTLE_ENDIAN)
return word & ~(((op_t)-1) << (s * CHAR_BIT));
else
return word & ~(((op_t)-1) >> (s * CHAR_BIT));
}
#endif /* _STRING_SHIFT_H */
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