[PATCH v5 01/17] Parameterize op_t from memcopy.h

[Adhemerval Zanella]

From: Richard Henderson <rth@twiddle.net>

It moves the op_t definition out to an specific header, adds
the attribute 'may-alias', and cleanup its duplicated definitions.

Checked with a build and check with run-built-tests=no for all major
Linux ABIs.

Co-authored-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
---
 string/memcmp.c                 |  1 -
 sysdeps/generic/memcopy.h       |  6 ++----
 sysdeps/generic/string-optype.h | 31 +++++++++++++++++++++++++++++++
 3 files changed, 33 insertions(+), 5 deletions(-)
 create mode 100644 sysdeps/generic/string-optype.h

diff --git a/string/memcmp.c b/string/memcmp.c
index 40029474e6..6a9ceb8ac3 100644
--- a/string/memcmp.c
+++ b/string/memcmp.c
@@ -46,7 +46,6 @@
 /* Type to use for aligned memory operations.
    This should normally be the biggest type supported by a single load
    and store.  Must be an unsigned type.  */
-# define op_t	unsigned long int
 # define OPSIZ	(sizeof (op_t))
 
 /* Threshold value for when to enter the unrolled loops.  */
diff --git a/sysdeps/generic/memcopy.h b/sysdeps/generic/memcopy.h
index 251632e8ae..efe5f2475d 100644
--- a/sysdeps/generic/memcopy.h
+++ b/sysdeps/generic/memcopy.h
@@ -55,10 +55,8 @@
      [I fail to understand.  I feel stupid.  --roland]
 */
 
-/* Type to use for aligned memory operations.
-   This should normally be the biggest type supported by a single load
-   and store.  */
-#define	op_t	unsigned long int
+/* Type to use for aligned memory operations.  */
+#include <string-optype.h>
 #define OPSIZ	(sizeof (op_t))
 
 /* Type to use for unaligned operations.  */
diff --git a/sysdeps/generic/string-optype.h b/sysdeps/generic/string-optype.h
new file mode 100644
index 0000000000..fb6d67a19e
--- /dev/null
+++ b/sysdeps/generic/string-optype.h
@@ -0,0 +1,31 @@
+/* Define a type to use for word access.  Generic version.
+   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; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _STRING_OPTYPE_H
+#define _STRING_OPTYPE_H 1
+
+/* Use the existing parameterization from gmp as a default.  */
+#include <gmp-mparam.h>
+
+#ifdef _LONG_LONG_LIMB
+typedef unsigned long long int __attribute__ ((__may_alias__)) op_t;
+#else
+typedef unsigned long int __attribute__ ((__may_alias__)) op_t;
+#endif
+
+#endif /* string-optype.h */
-- 
2.34.1