mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-24 22:10:13 +00:00
d45890b28c
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>
89 lines
3.3 KiB
C
89 lines
3.3 KiB
C
/* memcopy.h -- definitions for memory copy functions. i386 version.
|
|
Copyright (C) 1991-2023 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdeps/generic/memcopy.h>
|
|
|
|
#undef BYTE_COPY_FWD
|
|
#define BYTE_COPY_FWD(dst_bp, src_bp, nbytes) \
|
|
do { \
|
|
int __d0; \
|
|
asm volatile(/* Clear the direction flag, so copying goes forward. */ \
|
|
"cld\n" \
|
|
/* Copy bytes. */ \
|
|
"rep\n" \
|
|
"movsb" : \
|
|
"=D" (dst_bp), "=S" (src_bp), "=c" (__d0) : \
|
|
"0" (dst_bp), "1" (src_bp), "2" (nbytes) : \
|
|
"memory"); \
|
|
} while (0)
|
|
|
|
#undef BYTE_COPY_BWD
|
|
#define BYTE_COPY_BWD(dst_ep, src_ep, nbytes) \
|
|
do \
|
|
{ \
|
|
int __d0; \
|
|
asm volatile(/* Set the direction flag, so copying goes backwards. */ \
|
|
"std\n" \
|
|
/* Copy bytes. */ \
|
|
"rep\n" \
|
|
"movsb\n" \
|
|
/* Clear the dir flag. Convention says it should be 0. */ \
|
|
"cld" : \
|
|
"=D" (dst_ep), "=S" (src_ep), "=c" (__d0) : \
|
|
"0" (dst_ep - 1), "1" (src_ep - 1), "2" (nbytes) : \
|
|
"memory"); \
|
|
dst_ep += 1; \
|
|
src_ep += 1; \
|
|
} while (0)
|
|
|
|
#undef WORD_COPY_FWD
|
|
#define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \
|
|
do \
|
|
{ \
|
|
int __d0; \
|
|
asm volatile(/* Clear the direction flag, so copying goes forward. */ \
|
|
"cld\n" \
|
|
/* Copy longwords. */ \
|
|
"rep\n" \
|
|
"movsl" : \
|
|
"=D" (dst_bp), "=S" (src_bp), "=c" (__d0) : \
|
|
"0" (dst_bp), "1" (src_bp), "2" ((nbytes) / 4) : \
|
|
"memory"); \
|
|
(nbytes_left) = (nbytes) % 4; \
|
|
} while (0)
|
|
|
|
#undef WORD_COPY_BWD
|
|
#define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \
|
|
do \
|
|
{ \
|
|
int __d0; \
|
|
asm volatile(/* Set the direction flag, so copying goes backwards. */ \
|
|
"std\n" \
|
|
/* Copy longwords. */ \
|
|
"rep\n" \
|
|
"movsl\n" \
|
|
/* Clear the dir flag. Convention says it should be 0. */ \
|
|
"cld" : \
|
|
"=D" (dst_ep), "=S" (src_ep), "=c" (__d0) : \
|
|
"0" (dst_ep - 4), "1" (src_ep - 4), "2" ((nbytes) / 4) : \
|
|
"memory"); \
|
|
dst_ep += 4; \
|
|
src_ep += 4; \
|
|
(nbytes_left) = (nbytes) % 4; \
|
|
} while (0)
|