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136 lines
3.1 KiB
ArmAsm
136 lines
3.1 KiB
ArmAsm
/* Highly optimized version for i586.
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Copyright (C) 1997, 2000, 2003, 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include "asm-syntax.h"
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#include "bp-sym.h"
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#include "bp-asm.h"
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/* BEWARE: `#ifdef memcpy' means that memcpy is redefined as `mempcpy',
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and the return value is the byte after the last one copied in
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the destination. */
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#define MEMPCPY_P (defined memcpy)
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#define PARMS LINKAGE+8 /* space for 2 saved regs */
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#define RTN PARMS
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#define DEST RTN+RTN_SIZE
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#define SRC DEST+PTR_SIZE
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#define LEN SRC+PTR_SIZE
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.text
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#if defined PIC && !defined NOT_IN_libc
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ENTRY (__memcpy_chk)
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movl 12(%esp), %eax
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cmpl %eax, 16(%esp)
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jb HIDDEN_JUMPTARGET (__chk_fail)
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END (__memcpy_chk)
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#endif
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ENTRY (BP_SYM (memcpy))
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ENTER
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pushl %edi
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cfi_adjust_cfa_offset (4)
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pushl %esi
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cfi_adjust_cfa_offset (4)
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movl DEST(%esp), %edi
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cfi_rel_offset (edi, 4)
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movl SRC(%esp), %esi
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cfi_rel_offset (esi, 0)
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movl LEN(%esp), %ecx
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CHECK_BOUNDS_BOTH_WIDE (%edi, DEST(%esp), %ecx)
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CHECK_BOUNDS_BOTH_WIDE (%esi, SRC(%esp), %ecx)
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movl %edi, %eax
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/* We need this in any case. */
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cld
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/* Cutoff for the big loop is a size of 32 bytes since otherwise
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the loop will never be entered. */
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cmpl $32, %ecx
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jbe L(1)
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negl %eax
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andl $3, %eax
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subl %eax, %ecx
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xchgl %eax, %ecx
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rep; movsb
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movl %eax, %ecx
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subl $32, %ecx
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js L(2)
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/* Read ahead to make sure we write in the cache since the stupid
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i586 designers haven't implemented read-on-write-miss. */
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movl (%edi), %eax
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L(3): movl 28(%edi), %edx
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/* Now correct the loop counter. Please note that in the following
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code the flags are not changed anymore. */
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subl $32, %ecx
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movl (%esi), %eax
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movl 4(%esi), %edx
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movl %eax, (%edi)
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movl %edx, 4(%edi)
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movl 8(%esi), %eax
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movl 12(%esi), %edx
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movl %eax, 8(%edi)
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movl %edx, 12(%edi)
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movl 16(%esi), %eax
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movl 20(%esi), %edx
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movl %eax, 16(%edi)
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movl %edx, 20(%edi)
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movl 24(%esi), %eax
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movl 28(%esi), %edx
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movl %eax, 24(%edi)
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movl %edx, 28(%edi)
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leal 32(%esi), %esi
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leal 32(%edi), %edi
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jns L(3)
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/* Correct extra loop counter modification. */
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L(2): addl $32, %ecx
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#if !MEMPCPY_P
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movl DEST(%esp), %eax
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#endif
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L(1): rep; movsb
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#if MEMPCPY_P
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movl %edi, %eax
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#endif
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popl %esi
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cfi_adjust_cfa_offset (-4)
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cfi_restore (esi)
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popl %edi
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cfi_adjust_cfa_offset (-4)
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cfi_restore (edi)
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LEAVE
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RET_PTR
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END (BP_SYM (memcpy))
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#if !MEMPCPY_P
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libc_hidden_builtin_def (memcpy)
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#endif
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