2008-04-27  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/18754
	PR tree-optimization/34223
	* tree-pass.h (pass_complete_unrolli): Declare.
	* tree-ssa-loop-ivcanon.c (try_unroll_loop_completely): Print
	loop size before and after unconditionally of UL_NO_GROWTH in effect.
	Rewrite loop into loop closed SSA form if it is not already.
	(tree_unroll_loops_completely): Re-structure to iterate over
	innermost loops with intermediate CFG cleanups.
	Unroll outermost loops only if requested or the code does not grow
	doing so.
	* tree-ssa-loop.c (gate_tree_vectorize): Don't shortcut if no
	loops are available.
	(tree_vectorize): Instead do so here.
	(tree_complete_unroll): Also unroll outermost loops.
	(tree_complete_unroll_inner): New function.
	(gate_tree_complete_unroll_inner): Likewise.
	(pass_complete_unrolli): New pass.
	* tree-ssa-loop-manip.c (find_uses_to_rename_use): Only record
	uses outside of the loop.
	(tree_duplicate_loop_to_header_edge): Only verify loop-closed SSA
	form if it is available.  
	* tree-flow.h (tree_unroll_loops_completely): Add extra parameter.
	* passes.c (init_optimization_passes): Schedule complete inner
	loop unrolling pass before the first CCP pass after final inlining.

	* gcc.dg/tree-ssa/loop-36.c: New testcase.
	* gcc.dg/tree-ssa/loop-37.c: Likewise.
	* gcc.dg/vect/vect-118.c: Likewise.
	* gcc.dg/Wunreachable-8.c: XFAIL bogus warning.
	* gcc.dg/vect/vect-66.c: Increase loop trip count.
	* gcc.dg/vect/no-section-anchors-vect-66.c: Likewise.
	* gcc.dg/vect/no-section-anchors-vect-69.c: Likewise.
	* gcc.dg/vect/vect-76.c: Likewise.
	* gcc.dg/vect/vect-outer-6.c: Likewise.
	* gcc.dg/vect/vect-outer-1.c: Likewise.
	* gcc.dg/vect/vect-outer-1a.c: Likewise.
	* gcc.dg/vect/vect-11a.c: Likewise.
	* gcc.dg/vect/vect-shift-1.c: Likewise.
	* gcc.target/i386/vectorize1.c: Likewise.

From-SVN: r134730