replace mfence with lock'ed inst

JuliaLang · Jan 4, 2023 · d0907be · d0907be
1 parent b6794f9
commit d0907be
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/src/julia_atomics.h b/src/julia_atomics.h
@@ -73,7 +73,11 @@ enum jl_memory_order {
  * are). We also need to access these atomic variables from the LLVM JIT code
  * which is very hard unless the layout of the object is fully specified.
  */
-#define jl_fence() atomic_thread_fence(memory_order_seq_cst)
+#if defined(_CPU_X86_64_)
+    #define jl_fence() __asm__ volatile("lock orq $0 , (%rsp)")
+#else
+    #define jl_fence() atomic_thread_fence(memory_order_seq_cst)
+#endif
 #define jl_fence_release() atomic_thread_fence(memory_order_release)
 #define jl_signal_fence() atomic_signal_fence(memory_order_seq_cst)