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