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/* Zero byte detection; basics. PowerPC version.
Copyright (C) 2023 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 _POWERPC_STRING_FZA_H
#define _POWERPC_STRING_FZA_H 1
/* PowerISA 2.05 (POWER6) provides cmpb instruction. */
#ifdef _ARCH_PWR6
# include <limits.h>
# include <endian.h>
# include <stdint.h>
# include <string-maskoff.h>
# include <string-optype.h>
/* The functions return a byte mask. */
typedef op_t find_t;
/* 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 the the S alignment value. */
static __always_inline find_t
shift_find_last (find_t word, uintptr_t s)
{
return word & create_mask (s);
}
/* This function returns 0xff for each byte that is
equal between X1 and X2. */
static __always_inline find_t
find_eq_all (op_t x1, op_t x2)
{
op_t ret;
asm ("cmpb %0,%1,%2" : "=r"(ret) : "r"(x1), "r"(x2));
return ret;
}
/* This function returns 0xff for each byte that is zero in X. */
static __always_inline find_t
find_zero_all (op_t x)
{
return find_eq_all (x, 0);
}
/* Identify zero bytes in X1 or equality between X1 and X2. */
static __always_inline find_t
find_zero_eq_all (op_t x1, op_t x2)
{
return find_zero_all (x1) | find_eq_all (x1, x2);
}
/* Identify zero bytes in X1 or inequality between X1 and X2. */
static __always_inline find_t
find_zero_ne_all (op_t x1, op_t x2)
{
return find_zero_all (x1) | ~find_eq_all (x1, x2);
}
/* Define the "inexact" versions in terms of the exact versions. */
# define find_zero_low find_zero_all
# define find_eq_low find_eq_all
# define find_zero_eq_low find_zero_eq_all
# define find_zero_ne_low find_zero_ne_all
#else
# include <sysdeps/generic/string-fza.h>
#endif /* _ARCH_PWR6 */
#endif /* _POWERPC_STRING_FZA_H */
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