mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
87 lines
3.2 KiB
C
87 lines
3.2 KiB
C
/* memcopy.h -- definitions for memory copy functions. i386 version.
|
|
Copyright (C) 1991 Free Software Foundation, Inc.
|
|
Contributed by Torbjorn Granlund (tege@sics.se).
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#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) \
|
|
asm volatile(/* Clear the direction flag, so copying goes forward. */ \
|
|
"cld\n" \
|
|
/* Copy bytes. */ \
|
|
"rep\n" \
|
|
"movsb" : \
|
|
"=D" (dst_bp), "=S" (src_bp) : \
|
|
"0" (dst_bp), "1" (src_bp), "c" (nbytes) : \
|
|
"cx")
|
|
|
|
#undef BYTE_COPY_BWD
|
|
#define BYTE_COPY_BWD(dst_ep, src_ep, nbytes) \
|
|
do \
|
|
{ \
|
|
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) : \
|
|
"0" (dst_ep - 1), "1" (src_ep - 1), "c" (nbytes) : \
|
|
"cx"); \
|
|
dst_ep += 1; \
|
|
src_ep += 1; \
|
|
} while (0)
|
|
|
|
#undef WORD_COPY_FWD
|
|
#define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \
|
|
do \
|
|
{ \
|
|
asm volatile(/* Clear the direction flag, so copying goes forward. */ \
|
|
"cld\n" \
|
|
/* Copy longwords. */ \
|
|
"rep\n" \
|
|
"movsl" : \
|
|
"=D" (dst_bp), "=S" (src_bp) : \
|
|
"0" (dst_bp), "1" (src_bp), "c" ((nbytes) / 4) : \
|
|
"cx"); \
|
|
(nbytes_left) = (nbytes) % 4; \
|
|
} while (0)
|
|
|
|
#undef WORD_COPY_BWD
|
|
#define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \
|
|
do \
|
|
{ \
|
|
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) : \
|
|
"0" (dst_ep - 4), "1" (src_ep - 4), "c" ((nbytes) / 4) : \
|
|
"cx"); \
|
|
dst_ep += 4; \
|
|
src_ep += 4; \
|
|
(nbytes_left) = (nbytes) % 4; \
|
|
} while (0)
|