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56db793abf
2004-06-21 Daniel Berlin <dberlin@dberlin.org>
Fix PR optimization/15982
* tree-ssa-pre.c: Update a few comments and todos to
reflect constants change.
(get_value_handle): Constants now value number to themselves.
(lookup): Constants lookup to themselves.
(add_to_value): Adjust to always be on.
(set_contains_value): Adjust for constants change.
(find_leader): Ditto.
(phi_translate): 'r' nodes are never ANTIC right now.
(valid_in_set): Ditto.
(get_expr_set): New function.
(find_or_generate_expression): New function, broken out from
insert_aux.
(create_expression_by_pieces): Ditto, plus additional
machinery to handle complex values.
(compute_avail): Remove dead RETURN_EXPR handling.
From-SVN: r83453
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