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Parameterize OP_T_THRES from memcopy.h

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It moves OP_T_THRES out of memcopy.h to its own header and adjust
each architecture that redefines it.

Checked with a build and check with run-built-tests=no for all major
Linux ABIs.

Co-authored-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-01-10 18:00:51 -03:00 committed by Adhemerval Zanella
parent d1a9b6d8e7
commit d45890b28c
7 changed files with 51 additions and 17 deletions
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3
string/memcmp.c
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@ -48,9 +48,6 @@
and store. Must be an unsigned type. */
# define OPSIZ (sizeof (op_t))
/* Threshold value for when to enter the unrolled loops. */
# define OP_T_THRES 16
/* Type to use for unaligned operations. */
typedef unsigned char byte;

4
sysdeps/generic/memcopy.h
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@ -57,6 +57,7 @@
/* Type to use for aligned memory operations. */
#include <string-optype.h>
#include <string-opthr.h>
#define OPSIZ (sizeof (op_t))
/* Type to use for unaligned operations. */
@ -188,9 +189,6 @@ extern void _wordcopy_bwd_dest_aligned (long int, long int, size_t)
#endif
/* Threshold value for when to enter the unrolled loops. */
#define OP_T_THRES 16
/* Set to 1 if memcpy is safe to use for forward-copying memmove with
overlapping addresses. This is 0 by default because memcpy implementations
are generally not safe for overlapping addresses. */

25
sysdeps/generic/string-opthr.h Normal file
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@ -0,0 +1,25 @@
/* Define a threshold for word access. Generic 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 _STRING_OPTHR_H
#define _STRING_OPTHR_H 1
/* Threshold value for when to enter the unrolled loops. */
#define OP_T_THRES 16
#endif /* string-opthr.h */

3
sysdeps/i386/memcopy.h
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@ -18,9 +18,6 @@
#include <sysdeps/generic/memcopy.h>
#undef OP_T_THRES
#define OP_T_THRES 8
#undef BYTE_COPY_FWD
#define BYTE_COPY_FWD(dst_bp, src_bp, nbytes) \
do { \

25
sysdeps/i386/string-opthr.h Normal file
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@ -0,0 +1,25 @@
/* Define a threshold for word access. i386 version.
Copyright (C) 2018 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 I386_STRING_OPTHR_H
#define I386_STRING_OPTHR_H 1
/* Threshold value for when to enter the unrolled loops. */
#define OP_T_THRES 8
#endif /* I386_STRING_OPTHR_H */

3
sysdeps/m68k/memcopy.h
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@ -20,9 +20,6 @@
#if defined(__mc68020__) || defined(mc68020)
#undef OP_T_THRES
#define OP_T_THRES 16
/* WORD_COPY_FWD and WORD_COPY_BWD are not symmetric on the 68020,
because of its weird instruction overlap characteristics. */

5
sysdeps/powerpc/powerpc32/power4/memcopy.h
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@ -50,11 +50,6 @@
[I fail to understand. I feel stupid. --roland]
*/
/* Threshold value for when to enter the unrolled loops. */
#undef OP_T_THRES
#define OP_T_THRES 16
/* Copy exactly NBYTES bytes from SRC_BP to DST_BP,
without any assumptions about alignment of the pointers. */
#undef BYTE_COPY_FWD