[patch] pr18181 fix: part4 (last)

[Dorit Naishlos]

The actual fix for pr18181.
See detailed description here:
http://gcc.gnu.org/ml/gcc-patches/2004-11/msg00283.html.

ok?

thanks,
dorit

Changelog:

        * tree-vectorizer.c (slpeel_tree_peel_loop_to_edge): Peeling scheme
        changed to suppoer uses-after-loop and to void creating flow paths
        that shouldn't exist.
        (slpeel_update_phi_nodes_for_guard): Takes additional two
arguments.
        Modified to fit the new peeling scheme. Avoid quadratic behavior.
        (slpeel_add_loop_guard): Takes additional argument.
        (slpeel_verify_cfg_after_peeling): New function.
        (vect_update_ivs_after_vectorizer): Takes additional argument.
Updated
        documentation. Use 'exit-bb' instead of creating 'new-bb'.
        (rename_variables_in_bb): Don't update phis for BBs out of loop, to
fit
        the new peeling scheme.
        (copy_phi_nodes): Function removed. Its functionality moved to
        update_phis_for_duplicate_loop.
        (slpeel_update_phis_for_duplicate_loop): Functionality of
copy_phi_nodes
        moved here. Added documentation. Modified to fit the new peeling
scheme.
        (slpeel_make_loop_iterate_ntimes): Setting loop->single_exit not
not
        needed - done in slpeel_tree_peel_loop_to_edge.
        (slpeel_tree_duplicate_loop_to_edge_cfg): Debug printouts
compacted.
        (vect_do_peeling_for_loop_bound): Add documentation. Call
        slpeel_verify_cfg_after_peeling. Call
vect_update_ivs_after_vectorizer
        with additional argument.
        (vect_do_peeling_for_alignment): Call
slpeel_verify_cfg_after_peeling.

        (vect_finish_stmt_generation): Avoid 80 column oveflow.

Patch:

(See attached file: pr18181.part4)
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