mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 05:20:06 +00:00
080685c90f
While ppc has the more important string functions in assembly, there are still a few generic routines used. Use the Power 6 CMPB insn for testing of zeros. Checked on powerpc64le-linux-gnu. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/* 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 <string-misc.h>
|
|
# include <string-optype.h>
|
|
|
|
/* The functions return a byte mask. */
|
|
typedef op_t find_t;
|
|
|
|
/* 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)
|
|
{
|
|
return __builtin_cmpb (x1, x2);
|
|
}
|
|
|
|
/* 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
|
|
#else
|
|
# include <sysdeps/generic/string-fza.h>
|
|
#endif /* _ARCH_PWR6 */
|
|
|
|
#endif /* _POWERPC_STRING_FZA_H */
|