x86_64: Add support for __memcmpeq using sse2, avx2, and evex

No bug. This commit adds support for __memcmpeq to be implemented
seperately from memcmp. Support is added for versions optimized with
sse2, avx2, and evex.

1 files changed, 35 insertions, 0 deletions

diff --git a/sysdeps/x86_64/multiarch/memcmpeq.c b/sysdeps/x86_64/multiarch/memcmpeq.c
new file mode 100644
index 0000000000..163e56047e
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/memcmpeq.c
@@ -0,0 +1,35 @@
+/* Multiple versions of __memcmpeq.
+   All versions must be listed in ifunc-impl-list.c.
+   Copyright (C) 2017-2021 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/>.  */
+
+/* Define multiple versions only for the definition in libc.  */
+#if IS_IN (libc)
+# define __memcmpeq __redirect___memcmpeq
+# include <string.h>
+# undef __memcmpeq
+
+# define SYMBOL_NAME __memcmpeq
+# include "ifunc-memcmpeq.h"
+
+libc_ifunc_redirected (__redirect___memcmpeq, __memcmpeq, IFUNC_SELECTOR ());
+
+# ifdef SHARED
+__hidden_ver1 (__memcmpeq, __GI___memcmpeq, __redirect___memcmpeq)
+    __attribute__ ((visibility ("hidden"))) __attribute_copy__ (__memcmpeq);
+# endif
+#endif