File 1134-Enable-use-of-__atomic-acquire-release-barriers-on-6.patch of Package erlang
From ceb6000d3ed3b032c162887041d90fa48045c3a4 Mon Sep 17 00:00:00 2001
From: Rickard Green <rickard@erlang.org>
Date: Fri, 12 Feb 2021 16:25:48 +0100
Subject: [PATCH 2/2] Enable use of __atomic acquire/release barriers on 64-bit
ppc for gcc >= 9.3.0
---
erts/include/internal/gcc/ethread.h | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/erts/include/internal/gcc/ethread.h b/erts/include/internal/gcc/ethread.h
index 12b41f8704..d9448592d1 100644
--- a/erts/include/internal/gcc/ethread.h
+++ b/erts/include/internal/gcc/ethread.h
@@ -64,6 +68,14 @@
#elif !ETHR_AT_LEAST_GCC_VSN__(4, 8, 0)
/* True gcc of version < 4.8, i.e., bug exist... */
# define ETHR___atomic_load_ACQUIRE_barrier_bug ETHR_GCC_VERSIONS_MASK__
+#elif ETHR_AT_LEAST_GCC_VSN__(9, 3, 0) \
+ && (defined(__powerpc__) || defined(__ppc__) || defined(__powerpc64__)) \
+ && ETHR_SIZEOF_PTR == 8
+/* Verified not to have this bug */
+# define ETHR___atomic_load_ACQUIRE_barrier_bug 0
+/* Also trust builtin barriers */
+# undef ETHR_TRUST_GCC_ATOMIC_BUILTINS_MEMORY_BARRIERS__
+# define ETHR_TRUST_GCC_ATOMIC_BUILTINS_MEMORY_BARRIERS__ 1
#else /* True gcc of version >= 4.8 */
/*
* Sizes less than or equal to word size have been fixed,
--
2.26.2