re PR tree-optimization/56034 (ICE: verify_gimple failed (invalid PHI argument) with -ftree-loop-distribution)

2013-01-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/56034
	* tree-loop-distribution.c (enum partition_kind): Add
	PKIND_REDUCTION.
	(partition_builtin_p): Adjust.
	(generate_code_for_partition): Handle PKIND_REDUCTION.  Assert
	it is the last partition.
	(rdg_flag_uses): Check SSA_NAME_IS_DEFAULT_DEF before looking
	up the vertex for the definition.
	(classify_partition): Classify whether a partition is a
	PKIND_REDUCTION, thus has uses outside of the loop.
	(ldist_gen): Inherit PKIND_REDUCTION when merging partitions.
	Merge all PKIND_REDUCTION partitions into the last partition.
	(tree_loop_distribution): Seed partitions from reductions as well.

	* gcc.dg/torture/pr56034.c: New testcase.

From-SVN: r195508