From 4f6091a7e2bfafcc760162dc7d73b39500ed099b Mon Sep 17 00:00:00 2001
From: Jean Pierre Cimalando <jp-dev@inbox.ru>
Date: Sat, 1 Feb 2020 16:10:25 +0100
Subject: [PATCH] Do not generate instruction "yield" on older ARM than v6

---
 src/external/atomic_queue/defs.h | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/external/atomic_queue/defs.h b/src/external/atomic_queue/defs.h
index 1f721f6c..49d7d615 100644
--- a/src/external/atomic_queue/defs.h
+++ b/src/external/atomic_queue/defs.h
@@ -20,7 +20,21 @@ static inline void spin_loop_pause() noexcept {
 namespace atomic_queue {
 constexpr int CACHE_LINE_SIZE = 64;
 static inline void spin_loop_pause() noexcept {
-    __asm__ __volatile__("yield");
+#if (defined(__ARM_ARCH_6K__) || \
+     defined(__ARM_ARCH_6Z__) || \
+     defined(__ARM_ARCH_6ZK__) || \
+     defined(__ARM_ARCH_6T2__) || \
+     defined(__ARM_ARCH_7__) || \
+     defined(__ARM_ARCH_7A__) || \
+     defined(__ARM_ARCH_7R__) || \
+     defined(__ARM_ARCH_7M__) || \
+     defined(__ARM_ARCH_7S__) || \
+     defined(__ARM_ARCH_8A__) || \
+     defined(__aarch64__))
+    asm volatile ("yield" ::: "memory");
+#else
+    asm volatile ("nop" ::: "memory");
+#endif
 }
 } // namespace atomic_queue
 #else