2004-06-16 Daniel Berlin <dberlin@dberlin.org>

	* tree-ssa-pre.c (compute_avail): Value number uses as well.
	Strip useless type conversions.
	Casts have to be treated slightly different than normal unaries.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@83283 138bc75d-0d04-0410-961f-82ee72b054a4