bool do_constant_variable(exec_list *instructions);
bool do_constant_variable_unlinked(exec_list *instructions);
bool do_copy_propagation(exec_list *instructions);
+bool do_constant_propagation(exec_list *instructions);
bool do_dead_code(exec_list *instructions);
bool do_dead_code_local(exec_list *instructions);
bool do_dead_code_unlinked(exec_list *instructions);