| /* 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) 1999-2014 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 && !defined NOT_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) |
