2005-05-29 Keith Besaw <kbesaw@us.ibm.com>

        * tree-ssa-alias.c (new_type_alias): New procedure to
        create a type memory tag for a pointer with a may-alias
        set determined from a variable declaration.
        * tree-flow.h: export declaration of new_type_alias
        * tree-optimize.c (init_tree_optimization_passes): document
        that pass_may_alias cannot be called after pass_vectorize.
        * tree-vect-transform (vect_create_data_ref_ptr): Call
        new_type_alias when an type memory tag isn't available
        for a reference.
        (vectorizable_store): Use copy_virtual_operands to update
        virtual defs in place (so that loop_version can be called).
        Call mark_for_renaming for the virtual defs in case peeling
        is done and virtual uses outside the loop need to be updated.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@100322 138bc75d-0d04-0410-961f-82ee72b054a4

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