1 /* memcopy.h -- definitions for memory copy functions. i386 version.
2 Copyright (C) 1991-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
19 #include <sysdeps/generic/memcopy.h>
22 #define BYTE_COPY_FWD(dst_bp, src_bp, nbytes) \
25 asm volatile(/* Clear the direction flag, so copying goes forward. */ \
30 "=D" (dst_bp), "=S" (src_bp), "=c" (__d0) : \
31 "0" (dst_bp), "1" (src_bp), "2" (nbytes) : \
36 #define BYTE_COPY_BWD(dst_ep, src_ep, nbytes) \
40 asm volatile(/* Set the direction flag, so copying goes backwards. */ \
45 /* Clear the dir flag. Convention says it should be 0. */ \
47 "=D" (dst_ep), "=S" (src_ep), "=c" (__d0) : \
48 "0" (dst_ep - 1), "1" (src_ep - 1), "2" (nbytes) : \
55 #define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \
59 asm volatile(/* Clear the direction flag, so copying goes forward. */ \
61 /* Copy longwords. */ \
64 "=D" (dst_bp), "=S" (src_bp), "=c" (__d0) : \
65 "0" (dst_bp), "1" (src_bp), "2" ((nbytes) / 4) : \
67 (nbytes_left) = (nbytes) % 4; \
71 #define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \
75 asm volatile(/* Set the direction flag, so copying goes backwards. */ \
77 /* Copy longwords. */ \
80 /* Clear the dir flag. Convention says it should be 0. */ \
82 "=D" (dst_ep), "=S" (src_ep), "=c" (__d0) : \
83 "0" (dst_ep - 4), "1" (src_ep - 4), "2" ((nbytes) / 4) : \
87 (nbytes_left) = (nbytes) % 4; \