/* For a MEM rtx, the alias set. If 0, this MEM is not in any alias set, and may alias anything. Otherwise, the MEM can only alias MEMs in a conflicting alias set. This value is set in a language-dependent manner in the front-end, and should not be altered in the back-end. These set numbers are tested with alias_sets_conflict_p. */ #define MEM_ALIAS_SET(RTX) (get_mem_attrs (RTX)->alias)