2010-09-01 Richard Guenther <rguenther@suse.de>

2010-09-01  Richard Guenther  <rguenther@suse.de>

	* tree-vrp.c (adjust_range_with_scev): Use number of iteration
	estimate.
	(vrp_visit_phi_node): Delay using SCEV till we balloon the
	range.
	(execute_vrp): Compute number of iteration estimates.
	* cfgloop.h (estimate_numbers_of_iterations_loop): Adjust prototype.
	* tree-flow.h (estimate_numbers_of_iterations): Likewise.
	* tree-data-ref.c (estimated_loop_iterations): Adjust.
	* tree-ssa-loop-niter.c (estimate_numbers_of_iterations_loop):
	Infer loop bounds from undefined behavior based on a new
	parameter.
	(estimate_numbers_of_iterations): Likewise.
	(scev_probably_wraps_p): Adjust.
	* tree-ssa-loop.c (tree_ssa_loop_bounds): Likewise.

	* gcc.dg/vect/vect-outer-fir.c: Adjust.
	* gcc.dg/tree-ssa/vrp54.c: New testcase.
	* gcc.c-torture/execute/20100827-1.c: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@163724 138bc75d-0d04-0410-961f-82ee72b054a4