Index: cfe/trunk/include/clang/Basic/BuiltinsAArch64.def
===================================================================
--- cfe/trunk/include/clang/Basic/BuiltinsAArch64.def
+++ cfe/trunk/include/clang/Basic/BuiltinsAArch64.def
@@ -28,6 +28,7 @@
 BUILTIN(__builtin_arm_rbit64, "LUiLUi", "nc")
 
 // HINT
+BUILTIN(__builtin_arm_nop, "v", "")
 BUILTIN(__builtin_arm_yield, "v", "")
 BUILTIN(__builtin_arm_wfe, "v", "")
 BUILTIN(__builtin_arm_wfi, "v", "")
Index: cfe/trunk/include/clang/Basic/BuiltinsARM.def
===================================================================
--- cfe/trunk/include/clang/Basic/BuiltinsARM.def
+++ cfe/trunk/include/clang/Basic/BuiltinsARM.def
@@ -68,6 +68,7 @@
 BUILTIN(__builtin_arm_crc32cd, "UiUiLLUi", "nc")
 
 // HINT
+BUILTIN(__builtin_arm_nop, "v", "")
 BUILTIN(__builtin_arm_yield, "v", "")
 BUILTIN(__builtin_arm_wfe, "v", "")
 BUILTIN(__builtin_arm_wfi, "v", "")
Index: cfe/trunk/lib/CodeGen/CGBuiltin.cpp
===================================================================
--- cfe/trunk/lib/CodeGen/CGBuiltin.cpp
+++ cfe/trunk/lib/CodeGen/CGBuiltin.cpp
@@ -3040,6 +3040,9 @@
   unsigned HintID = static_cast<unsigned>(-1);
   switch (BuiltinID) {
   default: break;
+  case ARM::BI__builtin_arm_nop:
+    HintID = 0;
+    break;
   case ARM::BI__builtin_arm_yield:
   case ARM::BI__yield:
     HintID = 1;
@@ -3804,6 +3807,9 @@
   unsigned HintID = static_cast<unsigned>(-1);
   switch (BuiltinID) {
   default: break;
+  case AArch64::BI__builtin_arm_nop:
+    HintID = 0;
+    break;
   case AArch64::BI__builtin_arm_yield:
     HintID = 1;
     break;
Index: cfe/trunk/test/CodeGen/builtins-arm.c
===================================================================
--- cfe/trunk/test/CodeGen/builtins-arm.c
+++ cfe/trunk/test/CodeGen/builtins-arm.c
@@ -19,6 +19,12 @@
   res = __builtin_eh_return_data_regno(1);  // CHECK: store volatile i32 1
 }
 
+void nop() {
+  __builtin_arm_nop();
+}
+
+// CHECK: call {{.*}} @llvm.arm.hint(i32 0)
+
 void yield() {
   __builtin_arm_yield();
 }
Index: cfe/trunk/test/CodeGen/builtins-arm64.c
===================================================================
--- cfe/trunk/test/CodeGen/builtins-arm64.c
+++ cfe/trunk/test/CodeGen/builtins-arm64.c
@@ -16,6 +16,7 @@
 }
 
 void hints() {
+  __builtin_arm_nop();    //CHECK: call {{.*}} @llvm.aarch64.hint(i32 0)
   __builtin_arm_yield();  //CHECK: call {{.*}} @llvm.aarch64.hint(i32 1)
   __builtin_arm_wfe();    //CHECK: call {{.*}} @llvm.aarch64.hint(i32 2)
   __builtin_arm_wfi();    //CHECK: call {{.*}} @llvm.aarch64.hint(i32 3)