Improve 64bit memcpy/memmove for Atom, Core 2 and Core i7

This patch includes optimized 64bit memcpy/memmove for Atom, Core 2 and
Core i7.  It improves memcpy by up to 3X on Atom, up to 4X on Core 2 and
up to 1X on Core i7.  It also improves memmove by up to 3X on Atom, up to
4X on Core 2 and up to 2X on Core i7.

1 files changed, 47 insertions, 0 deletions

diff --git a/sysdeps/x86_64/multiarch/mempcpy_chk.S b/sysdeps/x86_64/multiarch/mempcpy_chk.S
new file mode 100644
index 0000000000..024c775e95
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/mempcpy_chk.S
@@ -0,0 +1,47 @@
+/* Multiple versions of __mempcpy_chk
+   Copyright (C) 2010 Free Software Foundation, Inc.
+   Contributed by Intel Corporation.
+   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>
+#include <init-arch.h>
+
+/* Define multiple versions only for the definition in lib and for
+   DSO.  There are no multiarch mempcpy functions for static binaries.
+ */
+#ifndef NOT_IN_libc
+# ifdef SHARED
+	.text
+ENTRY(__mempcpy_chk)
+	.type	__mempcpy_chk, @gnu_indirect_function
+	cmpl	$0, KIND_OFFSET+__cpu_features(%rip)
+	jne	1f
+	call	__init_cpu_features
+1:	leaq	__mempcpy_chk_sse2(%rip), %rax
+	testl	$bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
+	jz	2f
+	leaq	__mempcpy_chk_ssse3(%rip), %rax
+	testl	$bit_Fast_Copy_Backward, __cpu_features+FEATURE_OFFSET+index_Fast_Copy_Backward(%rip)
+	jz	2f
+	leaq	__mempcpy_chk_ssse3_back(%rip), %rax
+2:	ret
+END(__mempcpy_chk)
+# else
+#  include "../mempcpy_chk.S"
+# endif
+#endif