--- a/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp	Mon Jan 22 12:00:41 2018 +0800
+++ b/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp	Fri Jan 19 16:57:56 2018 +0000
@@ -963,8 +963,12 @@
                                              RegisterOrConstant itable_index,
                                              Register method_result,
                                              Register scan_temp,
-                                             Label& L_no_such_interface) {
-  assert_different_registers(recv_klass, intf_klass, method_result, scan_temp);
+                                             Label& L_no_such_interface,
+                         bool return_method) {
+  assert_different_registers(recv_klass, intf_klass, scan_temp);
+  assert_different_registers(method_result, intf_klass, scan_temp);
+  assert(recv_klass != method_result || !return_method,
+     "recv_klass can be destroyed when method isn't needed");
   assert(itable_index.is_constant() || itable_index.as_register() == method_result,
          "caller must use same register for non-constant itable index as for method");
 
@@ -982,12 +986,14 @@
   lea(scan_temp, Address(recv_klass, scan_temp, Address::lsl(3)));
   add(scan_temp, scan_temp, vtable_base);
 
-  // Adjust recv_klass by scaled itable_index, so we can free itable_index.
-  assert(itableMethodEntry::size() * wordSize == wordSize, "adjust the scaling in the code below");
-  // lea(recv_klass, Address(recv_klass, itable_index, Address::times_ptr, itentry_off));
-  lea(recv_klass, Address(recv_klass, itable_index, Address::lsl(3)));
-  if (itentry_off)
-    add(recv_klass, recv_klass, itentry_off);
+  if (return_method) {
+    // Adjust recv_klass by scaled itable_index, so we can free itable_index.
+    assert(itableMethodEntry::size() * wordSize == wordSize, "adjust the scaling in the code below");
+    // lea(recv_klass, Address(recv_klass, itable_index, Address::times_ptr, itentry_off));
+    lea(recv_klass, Address(recv_klass, itable_index, Address::lsl(3)));
+    if (itentry_off)
+      add(recv_klass, recv_klass, itentry_off);
+  }
 
   // for (scan = klass->itable(); scan->interface() != NULL; scan += scan_step) {
   //   if (scan->interface() == intf) {
@@ -1021,8 +1027,10 @@
   bind(found_method);
 
   // Got a hit.
-  ldr(scan_temp, Address(scan_temp, itableOffsetEntry::offset_offset_in_bytes()));
-  ldr(method_result, Address(recv_klass, scan_temp));
+  if (return_method) {
+    ldrw(scan_temp, Address(scan_temp, itableOffsetEntry::offset_offset_in_bytes()));
+    ldr(method_result, Address(recv_klass, scan_temp, Address::uxtw(0)));
+  }
 }
 
 // virtual method calling