2007-09-06  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/33302
	* tree-ssa-dse.c (tree_ssa_dse): Connect infinite loops
	to the exit block before doing the post-dominator walk.
	* domwalk.c (walk_dominator_tree): The exit block is
	interesting even if it is not reachable.

	* gcc.dg/tree-ssa/ssa-dse-11.c: New testcase.

From-SVN: r128180