Update copyright dates with scripts/update-copyrights.

[thirdparty/glibc.git] / sysdeps / i386 / i686 / memcpy.S

diff --git a/sysdeps/i386/i686/memcpy.S b/sysdeps/i386/i686/memcpy.S
index cf836f438fef61bcb96dc40a97694596be270775..7346b3f16ffc9877276ba0d2df32da32c8e679d6 100644 (file)
--- a/sysdeps/i386/i686/memcpy.S
+++ b/sysdeps/i386/i686/memcpy.S
@@ -1,48 +1,90 @@
 /* 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, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1999-2016 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 Library General Public License as
-   published by the Free Software Foundation; either version 2 of the
-   License, or (at your option) any later version.
+   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
-   Library General Public License for more details.
+   Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Library General Public
-   License along with the GNU C Library; see the file COPYING.LIB.  If not,
-   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   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"
-#include "bp-sym.h"
-#include "bp-asm.h"
 
-#define PARMS  LINKAGE         /* no space for saved regs */
+#define PARMS  4               /* no space for saved regs */
 #define RTN    PARMS
-#define DEST   RTN+RTN_SIZE
-#define SRC    DEST+PTR_SIZE
-#define LEN    SRC+PTR_SIZE
+#define DEST   RTN
+#define SRC    DEST+4
+#define LEN    SRC+4
 
        .text
-ENTRY (BP_SYM (memcpy))
-       ENTER
+#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    LEN(%esp), %ecx
        movl    %edi, %eax
        movl    DEST(%esp), %edi
        movl    %esi, %edx
        movl    SRC(%esp), %esi
-       CHECK_BOUNDS_BOTH_WIDE (%edi, DEST(%esp), %ecx)
-       CHECK_BOUNDS_BOTH_WIDE (%esi, SRC(%esp), %ecx)
 
+       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
@@ -51,11 +93,6 @@ ENTRY (BP_SYM (memcpy))
        movsw
 2:     rep
        movsl
-       movl    %eax, %edi
-       movl    %edx, %esi
-       movl    DEST(%esp), %eax
-       RETURN_BOUNDED_POINTER (DEST(%esp))
-
-       LEAVE
-       RET_PTR
-END (BP_SYM (memcpy))
+       jmp     .Lend
+END (memcpy)
+libc_hidden_builtin_def (memcpy)