From 77991fccee115731001d6fbe7284232d687355ee Mon Sep 17 00:00:00 2001
From: Jim Huang <jserv@biilabs.io>
Date: Sun, 23 Jun 2019 16:53:00 +0800
Subject: [PATCH] Implement ARM/Aarch64 atomic_yield fastpath

---
 include/mimalloc-atomic.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/mimalloc-atomic.h b/include/mimalloc-atomic.h
index d46e8515..f994b0c3 100644
--- a/include/mimalloc-atomic.h
+++ b/include/mimalloc-atomic.h
@@ -156,10 +156,17 @@ static inline uintptr_t mi_atomic_exchange(volatile uintptr_t* p, uintptr_t exch
   static inline void mi_atomic_yield() {
     std::this_thread::yield();
   }
-#elif (defined(__GNUC__) || defined(__clang__)) && (defined(__x86_64__) || defined(__i386__))
+#elif (defined(__GNUC__) || defined(__clang__)) && \
+      (defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__))
+#if defined(__x86_64__) || defined(__i386__)
   static inline void mi_atomic_yield() {
     asm volatile ("pause" ::: "memory");
   }
+#elif defined(__arm__) || defined(__aarch64__)
+  static inline void mi_atomic_yield() {
+    asm volatile("yield");
+  }
+#endif
 #else
   #include <unistd.h>
   static inline void mi_atomic_yield() {