2008-07-15  Daniel Berlin  <dberlin@dberlin.org>

	* tree-ssa-sccvn.c (expressions_equal_p): Check type equality.
	* tree-ssa-pre.c (pre_expr_eq): Ditto
	(get_constant_for_value_id): Take a type as an argument.
	(fully_constant_expression): Pass in type.
	(find_or_generate_expression): Short circuit constant case.
	(create_expression_by_pieces): Remove special casing of
	pointer_plus.
	(do_regular_insertion): Short circuit constant case.
	(do_partial_partial_insertion): Ditto.

From-SVN: r137859