--- a/hotspot/src/cpu/aarch64/vm/interp_masm_aarch64.cpp	Fri Apr 22 19:40:39 2016 +0200
+++ b/hotspot/src/cpu/aarch64/vm/interp_masm_aarch64.cpp	Mon Apr 25 14:22:36 2016 +0000
@@ -40,7 +40,43 @@
 #include "runtime/thread.inline.hpp"
 
 
-// Implementation of InterpreterMacroAssembler
+void InterpreterMacroAssembler::narrow(Register result) {
+
+  // Get method->_constMethod->_result_type
+  ldr(rscratch1, Address(rfp, frame::interpreter_frame_method_offset * wordSize));
+  ldr(rscratch1, Address(rscratch1, Method::const_offset()));
+  ldrb(rscratch1, Address(rscratch1, ConstMethod::result_type_offset()));
+
+  Label done, notBool, notByte, notChar;
+
+  // common case first
+  cmpw(rscratch1, T_INT);
+  br(Assembler::EQ, done);
+
+  // mask integer result to narrower return type.
+  cmpw(rscratch1, T_BOOLEAN);
+  br(Assembler::NE, notBool);
+  andw(result, result, 0x1);
+  b(done);
+
+  bind(notBool);
+  cmpw(rscratch1, T_BYTE);
+  br(Assembler::NE, notByte);
+  sbfx(result, result, 0, 8);
+  b(done);
+
+  bind(notByte);
+  cmpw(rscratch1, T_CHAR);
+  br(Assembler::NE, notChar);
+  ubfx(result, result, 0, 16);  // truncate upper 16 bits
+  b(done);
+
+  bind(notChar);
+  sbfx(result, result, 0, 16);     // sign-extend short
+
+  // Nothing to do for T_INT
+  bind(done);
+}
 
 void InterpreterMacroAssembler::jump_to_entry(address entry) {
   assert(entry, "Entry must have been generated by now");
@@ -81,6 +117,7 @@
                verify_oop(r0, state);               break;
     case ltos: ldr(r0, val_addr);                   break;
     case btos:                                   // fall through
+    case ztos:                                   // fall through
     case ctos:                                   // fall through
     case stos:                                   // fall through
     case itos: ldrw(r0, val_addr);                  break;
@@ -314,6 +351,7 @@
   switch (state) {
   case atos: pop_ptr();                 break;
   case btos:
+  case ztos:
   case ctos:
   case stos:
   case itos: pop_i();                   break;
@@ -331,6 +369,7 @@
   switch (state) {
   case atos: push_ptr();                break;
   case btos:
+  case ztos:
   case ctos:
   case stos:
   case itos: push_i();                  break;