Fix PR43023: fuse_partitions_with_similar_memory_accesses.

Fix PR43023: fuse_partitions_with_similar_memory_accesses.

2010-12-10  Sebastian Pop  <sebastian.pop@amd.com>

	PR tree-optimization/43023
	* tree-data-ref.c (mem_write_stride_of_same_size_as_unit_type_p):
	Removed.
	(stores_zero_from_loop): Call stmt_stores_zero.
	* tree-data-ref.h (stmt_stores_zero): New.
	* tree-loop-distribution.c (generate_memset_zero): Do not return a
	boolean.  Call gcc_assert on stride_of_unit_type_p.
	(generate_builtin): Call stmt_stores_zero.
	(rdg_flag_all_uses): Removed.
	(rdg_flag_similar_memory_accesses): Removed.
	(build_rdg_partition_for_component): Removed parameter
	other_stores.  Removed call to rdg_flag_similar_memory_accesses.
	(can_generate_builtin): New.
	(similar_memory_accesses): New.
	(fuse_partitions_with_similar_memory_accesses): New.
	(rdg_build_partitions): Call
	fuse_partitions_with_similar_memory_accesses.

	* gfortran.dg/ldist-1.f90: Adjust pattern.
	* gfortran.dg/ldist-pr43023.f90: New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@167697 138bc75d-0d04-0410-961f-82ee72b054a4