[PATCH] s390: libatomic: Fix 16 byte atomic {cas,load,store}

[Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>]

This is a follow-up to commit a4c6bd0821099f6b8c0f64a96ffd9d01a025c413
introducing a runtime check for alignment for 16 byte atomic
compare-exchange, load, and store.

Bootstrapped and regtested on s390.
Ok for mainline and gcc-{12,11,10}?

libatomic/ChangeLog:

	* config/s390/cas_n.c: New file.
	* config/s390/load_n.c: New file.
	* config/s390/store_n.c: New file.
---
 libatomic/config/s390/cas_n.c   | 65 +++++++++++++++++++++++++++++++++
 libatomic/config/s390/load_n.c  | 57 +++++++++++++++++++++++++++++
 libatomic/config/s390/store_n.c | 54 +++++++++++++++++++++++++++
 3 files changed, 176 insertions(+)
 create mode 100644 libatomic/config/s390/cas_n.c
 create mode 100644 libatomic/config/s390/load_n.c
 create mode 100644 libatomic/config/s390/store_n.c

diff --git a/libatomic/config/s390/cas_n.c b/libatomic/config/s390/cas_n.c
new file mode 100644
index 00000000000..44b7152ca5d
--- /dev/null
+++ b/libatomic/config/s390/cas_n.c
@@ -0,0 +1,65 @@
+/* Copyright (C) 2018-2023 Free Software Foundation, Inc.
+
+   This file is part of the GNU Atomic Library (libatomic).
+
+   Libatomic is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   Libatomic 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 General Public License for
+   more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <libatomic_i.h>
+
+
+/* Analog to config/s390/exch_n.c.  */
+
+#if !DONE && N == 16
+bool
+SIZE(libat_compare_exchange) (UTYPE *mptr, UTYPE *eptr, UTYPE newval,
+			      int smodel, int fmodel UNUSED)
+{
+  if (!((uintptr_t)mptr & 0xf))
+    {
+      return __atomic_compare_exchange_n (
+	(UTYPE *)__builtin_assume_aligned (mptr, 16), eptr, newval, false,
+	__ATOMIC_SEQ_CST, __ATOMIC_RELAXED);
+    }
+  else
+    {
+      UTYPE oldval;
+      UWORD magic;
+      bool ret;
+
+      pre_seq_barrier (smodel);
+      magic = protect_start (mptr);
+
+      oldval = *mptr;
+      ret = (oldval == *eptr);
+      if (ret)
+	*mptr = newval;
+      else
+	*eptr = oldval;
+
+      protect_end (mptr, magic);
+      post_seq_barrier (smodel);
+
+      return ret;
+    }
+}
+#define DONE 1
+#endif /* N == 16 */
+
+#include "../../cas_n.c"
diff --git a/libatomic/config/s390/load_n.c b/libatomic/config/s390/load_n.c
new file mode 100644
index 00000000000..335d2f8b2c3
--- /dev/null
+++ b/libatomic/config/s390/load_n.c
@@ -0,0 +1,57 @@
+/* Copyright (C) 2018-2023 Free Software Foundation, Inc.
+
+   This file is part of the GNU Atomic Library (libatomic).
+
+   Libatomic is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   Libatomic 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 General Public License for
+   more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <libatomic_i.h>
+
+
+/* Analog to config/s390/exch_n.c.  */
+
+#if !DONE && N == 16
+UTYPE
+SIZE(libat_load) (UTYPE *mptr, int smodel)
+{
+  if (!((uintptr_t)mptr & 0xf))
+    {
+      return __atomic_load_n ((UTYPE *)__builtin_assume_aligned (mptr, 16),
+			      __ATOMIC_SEQ_CST);
+    }
+  else
+    {
+      UTYPE ret;
+      UWORD magic;
+
+      pre_seq_barrier (smodel);
+      magic = protect_start (mptr);
+
+      ret = *mptr;
+
+      protect_end (mptr, magic);
+      post_seq_barrier (smodel);
+
+      return ret;
+    }
+}
+#define DONE 1
+#endif /* N == 16 */
+
+#include "../../load_n.c"
diff --git a/libatomic/config/s390/store_n.c b/libatomic/config/s390/store_n.c
new file mode 100644
index 00000000000..9e5b2b8213d
--- /dev/null
+++ b/libatomic/config/s390/store_n.c
@@ -0,0 +1,54 @@
+/* Copyright (C) 2018-2023 Free Software Foundation, Inc.
+
+   This file is part of the GNU Atomic Library (libatomic).
+
+   Libatomic is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   Libatomic 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 General Public License for
+   more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <libatomic_i.h>
+
+
+/* Analog to config/s390/exch_n.c.  */
+
+#if !DONE && N == 16
+void
+SIZE(libat_store) (UTYPE *mptr, UTYPE newval, int smodel)
+{
+  if (!((uintptr_t)mptr & 0xf))
+    {
+      __atomic_store_n ((UTYPE *)__builtin_assume_aligned (mptr, 16), newval,
+			__ATOMIC_SEQ_CST);
+    }
+  else
+    {
+      UWORD magic;
+
+      pre_seq_barrier (smodel);
+      magic = protect_start (mptr);
+
+      *mptr = newval;
+
+      protect_end (mptr, magic);
+      post_seq_barrier (smodel);
+    }
+}
+#define DONE 1
+#endif /* N == 16 */
+
+#include "../../store_n.c"
-- 
2.39.1