re PR tree-optimization/59058 (wrong code at -O3 on x86_64-linux-gnu (affecting gcc...

re PR tree-optimization/59058 (wrong code at -O3 on x86_64-linux-gnu (affecting gcc 4.6 to trunk))

2013-11-21  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/59058
	* tree-scalar-evolution.h (number_of_exit_cond_executions): Remove.
	* tree-scalar-evolution.c (number_of_exit_cond_executions): Likewise.
	* tree-vectorizer.h (LOOP_PEELING_FOR_ALIGNMENT): Rename to ...
	(LOOP_VINFO_PEELING_FOR_ALIGNMENT): ... this.
	(NITERS_KNOWN_P): Fold into ...
	(LOOP_VINFO_NITERS_KNOWN_P): ... this.
	(LOOP_VINFO_PEELING_FOR_NITER): Add.
	* tree-vect-loop-manip.c (vect_gen_niters_for_prolog_loop):
	Use LOOP_VINFO_PEELING_FOR_ALIGNMENT.
	(vect_do_peeling_for_alignment): Re-use precomputed niter
	instead of re-emitting it.
	* tree-vect-data-refs.c (vect_enhance_data_refs_alignment):
	Use LOOP_VINFO_PEELING_FOR_ALIGNMENT.
	* tree-vect-loop.c (vect_get_loop_niters): Use
	number_of_latch_executions.
	(new_loop_vec_info): Initialize LOOP_VINFO_PEELING_FOR_NITER.
	(vect_analyze_loop_form): Simplify.
	(vect_analyze_loop_operations): Move epilogue peeling code ...
	(vect_analyze_loop_2): ... here and adjust it to compute
	LOOP_VINFO_PEELING_FOR_NITER.
	(vect_estimate_min_profitable_iters): Use
	LOOP_VINFO_PEELING_FOR_ALIGNMENT.
	(vect_build_loop_niters): Emit on the preheader.
	(vect_generate_tmps_on_preheader): Likewise.
	(vect_transform_loop): Use LOOP_VINFO_PEELING_FOR_NITER instead
	of recomputing it.  Adjust.

From-SVN: r205217