diff options
Diffstat (limited to 'REORG.TODO/sysdeps/i386/i686/memcpy.S')
| -rw-r--r-- | REORG.TODO/sysdeps/i386/i686/memcpy.S | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/i686/memcpy.S b/REORG.TODO/sysdeps/i386/i686/memcpy.S new file mode 100644 index 0000000000..1d61447430 --- /dev/null +++ b/REORG.TODO/sysdeps/i386/i686/memcpy.S @@ -0,0 +1,98 @@ +/* Copy memory block and return pointer to beginning of destination block + For Intel 80x86, x>=6. + This file is part of the GNU C Library. + Copyright (C) 1999-2017 Free Software Foundation, Inc. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. + + 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/>. */ + +#include <sysdep.h> +#include "asm-syntax.h" + +#define PARMS 4 /* no space for saved regs */ +#define RTN PARMS +#define DEST RTN +#define SRC DEST+4 +#define LEN SRC+4 + + .text +#if defined PIC && IS_IN (libc) +ENTRY_CHK (__memcpy_chk) + movl 12(%esp), %eax + cmpl %eax, 16(%esp) + jb HIDDEN_JUMPTARGET (__chk_fail) +END_CHK (__memcpy_chk) +#endif +ENTRY (memcpy) + + movl %edi, %eax + movl DEST(%esp), %edi + movl %esi, %edx + movl SRC(%esp), %esi + + movl %edi, %ecx + xorl %esi, %ecx + andl $3, %ecx + movl LEN(%esp), %ecx + cld + jne .Lunaligned + + cmpl $3, %ecx + jbe .Lunaligned + + testl $3, %esi + je 1f + movsb + decl %ecx + testl $3, %esi + je 1f + movsb + decl %ecx + testl $3, %esi + je 1f + movsb + decl %ecx +1: pushl %eax + movl %ecx, %eax + shrl $2, %ecx + andl $3, %eax + rep + movsl + movl %eax, %ecx + rep + movsb + popl %eax + +.Lend: movl %eax, %edi + movl %edx, %esi + movl DEST(%esp), %eax + + ret + + /* When we come here the pointers do not have the same + alignment or the length is too short. No need to optimize for + aligned memory accesses. */ +.Lunaligned: + shrl $1, %ecx + jnc 1f + movsb +1: shrl $1, %ecx + jnc 2f + movsw +2: rep + movsl + jmp .Lend +END (memcpy) +libc_hidden_builtin_def (memcpy) |