AArch64: Add memset_zva64

Add a specialized memset for the common ZVA size of 64 to avoid the
overhead of reading the ZVA size.  Since the code is identical to
__memset_falkor, remove the latter.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/sysdeps/aarch64/multiarch/memset_zva64.S b/sysdeps/aarch64/multiarch/memset_zva64.S
new file mode 100644
index 0000000000..13f45fd3d8
--- /dev/null
+++ b/sysdeps/aarch64/multiarch/memset_zva64.S
@@ -0,0 +1,27 @@
+/* Optimized memset for zva size = 64.
+   Copyright (C) 2023 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#define ZVA64_ONLY 1
+#define MEMSET __memset_zva64
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(X)
+
+#include "../memset.S"