--- old/src/share/vm/c1/c1_LIRGenerator.cpp	2016-02-25 22:50:45.458285778 +0300
+++ new/src/share/vm/c1/c1_LIRGenerator.cpp	2016-02-25 22:50:45.414285995 +0300
@@ -1272,6 +1272,26 @@
   __ move(call_result, result);
 }
 
+// java.lang.Class::isPrimitive()
+void LIRGenerator::do_isPrimitive(Intrinsic* x) {
+  assert(x->number_of_arguments() == 1, "wrong type");
+
+  LIRItem clazz(x->argument_at(0), this);
+  clazz.load_item();
+  LIR_Opr result = rlock_result(x);
+
+  if (x->needs_null_check()) {
+    CodeEmitInfo* info = state_for(x);
+    __ null_check(clazz.result(), info);
+  }
+
+  LIR_Opr call_result = call_runtime(clazz.value(),
+                                     CAST_FROM_FN_PTR(address, Runtime1::is_primitive),
+                                     x->type(),
+                                     NULL); // NULL CodeEmitInfo results in a leaf call
+  __ move(call_result, result);
+}
+
 // Example: object.getClass ()
 void LIRGenerator::do_getClass(Intrinsic* x) {
   assert(x->number_of_arguments() == 1, "wrong type");
@@ -3132,6 +3152,7 @@
 
   case vmIntrinsics::_Object_init:    do_RegisterFinalizer(x); break;
   case vmIntrinsics::_isInstance:     do_isInstance(x);    break;
+  case vmIntrinsics::_isPrimitive:    do_isPrimitive(x);   break;
   case vmIntrinsics::_getClass:       do_getClass(x);      break;
   case vmIntrinsics::_currentThread:  do_currentThread(x); break;