re PR tree-optimization/53081 (memcpy/memset loop recognition)

re PR tree-optimization/53081 (memcpy/memset loop recognition)

2012-06-06  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/53081
	* tree-data-ref.h (adjacent_store_dr_p): Rename to ...
	(adjacent_dr_p): ... this and make it work for reads, too.
	* tree-loop-distribution.c (enum partition_kind): Add PKIND_MEMCPY.
	(struct partition_s): Change main_stmt to main_dr, add
	secondary_dr member.
	(build_size_arg_loc): Change to date data-reference and not
	gimplify here.
	(build_addr_arg_loc): New function split out from ...
	(generate_memset_builtin): ... here.  Use it and simplify.
	(generate_memcpy_builtin): New function.
	(generate_code_for_partition): Adjust.
	(classify_partition): Streamline pattern detection.  Detect
	memcpy.
	(ldist_gen): Adjust.
	(tree_loop_distribution): Adjust seed statements for memcpy
	recognition.

	* gcc.dg/tree-ssa/ldist-20.c: New testcase.
	* gcc.dg/tree-ssa/loop-19.c: Add -fno-tree-loop-distribute-patterns.

From-SVN: r188261