2008-04-03  Richard Guenther  <rguenther@suse.de>

	* tree-vrp.c (extract_range_from_unary_expr): Handle all
	conversions.  Simplify code.

	* gcc.dg/tree-ssa/vrp43.c: New testcase.
	* gcc.dg/tree-ssa/vrp44.c: Likewise.
	* gcc.dg/tree-ssa/vrp45.c: Likewise.

From-SVN: r133866