loop.c (check_dbra_loop): A store using an address giv for which we have no life...

loop.c (check_dbra_loop): A store using an address giv for which we have no life information is not...

        1999-02-05  Michael Meissner  <meissner@cygnus.com>
                    J"orn Rennecke <amylaar@cygnus.co.uk>
        * loop.c (check_dbra_loop): A store using an address giv for which
        we have no life information is not reversible.
        * loop.c (first_loop_store_insn): New file-scope variable.
        (prescan_loop): Set it.
        (check_dbra_loop): Check if a store depends on a register
        that is set after the store.

From-SVN: r25181