[PATCH][AArch64] Inline mempcpy

["Wilco Dijkstra" <wdijkstr at arm dot com>]

Add inlining of mempcpy on AArch64 to expand into memcpy.

OK for commit?

2015-04-27  Wilco Dijkstra  <wdijkstr@arm.com>

        * sysdeps/aarch64/bits/string.h: New file.
        (_STRING_ARCH_unaligned): Define.
        (mempcpy): Redirect to __mempcpy_inline.
        (__mempcpy): Likewise.
        (__mempcpy_inline): New function.

---
 sysdeps/aarch64/bits/string.h | 50 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 sysdeps/aarch64/bits/string.h

diff --git a/sysdeps/aarch64/bits/string.h b/sysdeps/aarch64/bits/string.h
new file mode 100644
index 0000000..b0dacd6
--- /dev/null
+++ b/sysdeps/aarch64/bits/string.h
@@ -0,0 +1,50 @@
+/* Optimized, inlined string functions.  AArch64 version.
+   Copyright (C) 2015 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _STRING_H
+# error "Never use <bits/string.h> directly; include <string.h> instead."
+#endif
+
+/* AArch64 implementations support efficient unaligned access.  */
+#define _STRING_ARCH_unaligned 1
+
+#if !defined __NO_STRING_INLINES
+
+# ifndef __STRING_INLINE
+#  ifndef __extern_inline
+#   define __STRING_INLINE inline
+#  else
+#   define __STRING_INLINE __extern_inline
+#  endif
+# endif
+
+# ifdef __USE_GNU
+#  define _HAVE_STRING_ARCH_mempcpy 1
+#  define mempcpy(dest, src, n) __mempcpy_inline (dest, src, n)
+#  define __mempcpy(dest, src, n) __mempcpy_inline (dest, src, n)
+
+__STRING_INLINE void *
+__mempcpy_inline (void *__restrict __dest,
+		  const void *__restrict __src, size_t __n)
+{
+  return memcpy (__dest, __src, __n) + __n;
+}
+
+# endif
+
+#endif
-- 
1.9.1