2005-04-02  Daniel Berlin  <dberlin@dberlin.org>
	    Diego Novillo <dnovillo@redhat.com>

	Fix PR tree-optimization/20703
	Fix PR tree-optimization/20725

	* tree-ssa-pre.c (phi_translate): Handle tcc_comparison.
	(create_expression_by_pieces): Ditto.
	(valid_in_set): Ditto. Also handle tcc_declaration.
	(find_or_generate_expression): Handle comparison class.
	(insert_into_preds_of_block): Ditto.
	(insert_aux): Ditto.
	(create_value_expr_from): Handle comparison class, recursively
	handle reference nodes.
	(compute_avail): Handle comparison classes, rewrite a little cleaner.
	(execute_pre): Fix spacing.
	(do_fre): Renamed to execute_fre.

Co-Authored-By: Diego Novillo <dnovillo@redhat.com>

From-SVN: r97567