Logical shift left accumulator / Arithmetic shift of accumulator

def instruction_LSL_register(self, opcode, register):
        """
        Logical shift left accumulator / Arithmetic shift of accumulator
        """
        a = register.value
        r = self.LSL(a)
#        log.debug("$%x LSL %s value $%x << 1 = $%x" % (
#            self.program_counter,
#            register.name, a, r
#        ))
        register.set(r)