[glibc/arm/morello/main] aarch64: morello: string: dummy c memcmp

[Szabolcs Nagy <nsz@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=780a9a68ba3d4747b5b87c23580226d5ff576af7

commit 780a9a68ba3d4747b5b87c23580226d5ff576af7
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date:   Tue Apr 26 08:19:36 2022 +0100

    aarch64: morello: string: dummy c memcmp

Diff:
---
 sysdeps/aarch64/morello/memcmp.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/sysdeps/aarch64/morello/memcmp.c b/sysdeps/aarch64/morello/memcmp.c
new file mode 100644
index 0000000000..9b80aaa2c4
--- /dev/null
+++ b/sysdeps/aarch64/morello/memcmp.c
@@ -0,0 +1,38 @@
+/* Simple memcmp.
+
+   Copyright (C) 2022 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; see the file COPYING.LIB.  If
+   not, see <https://www.gnu.org/licenses/>.  */
+
+#include <string.h>
+
+int memcmp (const void *s1, const void *s2, size_t n)
+{
+  const unsigned char *us1 = s1;
+  const unsigned char *us2 = s2;
+  for (; n > 0; us1++, us2++, n--)
+    if (*us1 != *us2)
+      return *us1 - *us2;
+  return 0;
+}
+
+#undef bcmp
+weak_alias (memcmp, bcmp)
+libc_hidden_builtin_def (memcmp)
+
+#undef __memcmpeq
+strong_alias (memcmp, __memcmpeq)
+libc_hidden_def(__memcmpeq)