1 files changed, 102 insertions, 0 deletions
diff --git a/sysdeps/i386/i686/multiarch/memcpy-erms.S b/sysdeps/i386/i686/multiarch/memcpy-erms.S
new file mode 100644
index 0000000000..f134e79160
--- /dev/null
+++ b/sysdeps/i386/i686/multiarch/memcpy-erms.S
@@ -0,0 +1,102 @@
+/* memcpy with Enhanced REP MOVSB/STOSB
+   Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+
+#if !defined NOT_IN_libc \
+    && (defined SHARED \
+	|| defined USE_AS_MEMMOVE \
+	|| !defined USE_MULTIARCH)
+
+#include "asm-syntax.h"
+
+#ifndef MEMCPY
+# define MEMCPY		__memcpy_erms
+# define MEMCPY_CHK	__memcpy_chk_erms
+#endif
+
+#ifdef USE_AS_BCOPY
+# define STR2		12
+# define STR1		STR2+4
+# define N     		STR1+4
+#else
+# define STR1		12
+# define STR2		STR1+4
+# define N     		STR2+4
+#endif
+
+#define CFI_PUSH(REG)						\
+  cfi_adjust_cfa_offset (4);					\
+  cfi_rel_offset (REG, 0)
+
+#define CFI_POP(REG)						\
+  cfi_adjust_cfa_offset (-4);					\
+  cfi_restore (REG)
+
+#define PUSH(REG)	pushl REG; CFI_PUSH (REG)
+#define POP(REG)	popl REG; CFI_POP (REG)
+
+	.section .text.erms,"ax",@progbits
+#if !defined USE_AS_BCOPY
+ENTRY (MEMCPY_CHK)
+	movl	12(%esp), %eax
+	cmpl	%eax, 16(%esp)
+	jb	HIDDEN_JUMPTARGET (__chk_fail)
+END (MEMCPY_CHK)
+#endif
+ENTRY (MEMCPY)
+	PUSH	(%esi)
+	PUSH	(%edi)
+	movl	N(%esp), %ecx
+	movl	STR1(%esp), %edi
+	movl	STR2(%esp), %esi
+	mov	%edi, %eax
+#ifdef USE_AS_MEMPCPY
+	add	%ecx, %eax
+#endif
+
+#ifdef USE_AS_MEMMOVE
+	cmp	%esi, %edi
+	jbe	L(copy_forward)
+	lea	(%esi,%ecx), %edx
+	cmp	%edx, %edi
+	jb	L(copy_backward)
+L(copy_forward):
+#endif
+
+	rep	movsb
+	POP	(%edi)
+	POP	(%esi)
+	ret
+
+#ifdef USE_AS_MEMMOVE
+L(copy_backward):
+	lea	-1(%edi,%ecx), %edi
+	lea	-1(%esi,%ecx), %esi
+	std
+	rep	movsb
+	cld
+	POP	(%edi)
+	POP	(%esi)
+	ret
+#endif
+
+END (MEMCPY)
+
+#endif