Index: include/clang/Basic/BuiltinsAArch64.def
===================================================================
--- include/clang/Basic/BuiltinsAArch64.def
+++ include/clang/Basic/BuiltinsAArch64.def
@@ -46,6 +46,9 @@
 BUILTIN(__builtin_arm_crc32cd, "UiUiLUi", "nc")
 
 // Memory barrier
+BUILTIN(__dmb, "vUi", "nc")
+BUILTIN(__dsb, "vUi", "nc")
+BUILTIN(__isb, "vUi", "nc")
 BUILTIN(__builtin_arm_dmb, "vUi", "nc")
 BUILTIN(__builtin_arm_dsb, "vUi", "nc")
 BUILTIN(__builtin_arm_isb, "vUi", "nc")
Index: test/CodeGen/builtins-arm64.c
===================================================================
--- test/CodeGen/builtins-arm64.c
+++ test/CodeGen/builtins-arm64.c
@@ -30,6 +30,9 @@
 }
 
 void barriers() {
+  __dmb(1);  //CHECK: call {{.*}} @llvm.aarch64.dmb(i32 1)
+  __dsb(2);  //CHECK: call {{.*}} @llvm.aarch64.dsb(i32 2)
+  __isb(3);  //CHECK: call {{.*}} @llvm.aarch64.isb(i32 3)
   __builtin_arm_dmb(1);  //CHECK: call {{.*}} @llvm.aarch64.dmb(i32 1)
   __builtin_arm_dsb(2);  //CHECK: call {{.*}} @llvm.aarch64.dsb(i32 2)
   __builtin_arm_isb(3);  //CHECK: call {{.*}} @llvm.aarch64.isb(i32 3)