final MethodType ptype = lookupPrimop(stable, Ops[_op],
new MethodType(Type.Void,
tleft, tright));
if (ptype != null) {
final Type arg1 = (Type) ptype.argsType().elementAt(0);
if (!arg1.identicalTo(tleft)) {
_left = new CastExpr(_left, arg1);
}
final Type arg2 = (Type) ptype.argsType().elementAt(1);
if (!arg2.identicalTo(tright)) {
_right = new CastExpr(_right, arg1);