1 /* Highly optimized version for i586.
2 Copyright (C) 1997-2024 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/>. */
20 #include "asm-syntax.h"
22 #define PARMS 4+8 /* space for 2 saved regs */
29 #if defined SHARED && IS_IN (libc)
33 jb HIDDEN_JUMPTARGET (__chk_fail)
35 libc_hidden_builtin_def (__memcpy_chk)
40 cfi_adjust_cfa_offset (4)
42 cfi_adjust_cfa_offset (4)
45 cfi_rel_offset (edi, 4)
47 cfi_rel_offset (esi, 0)
51 /* We need this in any case. */
54 /* Cutoff for the big loop is a size of 32 bytes since otherwise
55 the loop will never be entered. */
70 /* Read ahead to make sure we write in the cache since the stupid
71 i586 designers haven't implemented read-on-write-miss. */
73 L(3): movl 28(%edi), %edx
75 /* Now correct the loop counter. Please note that in the following
76 code the flags are not changed anymore. */
101 /* Correct extra loop counter modification. */
103 #ifndef USE_AS_MEMPCPY
104 movl DEST(%esp), %eax
109 #ifdef USE_AS_MEMPCPY
114 cfi_adjust_cfa_offset (-4)
117 cfi_adjust_cfa_offset (-4)
122 #ifndef USE_AS_MEMPCPY
123 libc_hidden_builtin_def (memcpy)