2004-07-04 Daniel Berlin <dberlin@dberlin.org>
* tree-ssa-pre.c (bb_value_sets): phi_gen, tmp_gen, new_sets
now are bitmap_set_t's.
(bitmap_insert_into_set): No point in inserting the value if
it's invariant.
(bitmap_set_contains): New function.
(bitmap_set_replace_value): Add comment on why we do it
this way.
(set_contains): Removed.
(bitmap_set_subtract_from_value_set): New name of
set_subtract now that it's arguments are two different
types of sets.
Update callers.
(bitmap_find_leader): Change algorithm used.
(find_or_generate_expression): Update use of functions for new
bitmap sets.
(create_expression_by_pieces): Ditto.
(insert_aux): Ditto.
(insert): Ditto.
(add_to_sets): Ditto.
(init_pre): Ditto.
(execute_pre): Ditto.
(compute_avail): Ditto.
Also ignore virtual phis.
From-SVN: r84099
