re PR tree-optimization/84362 (Auto-vectorization regression when accessing member...

re PR tree-optimization/84362 (Auto-vectorization regression when accessing member variable through getter/accessor)

2018-12-20  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/84362
	* tree-ssa-loop-im.c: Include alias.h, builtins.h and tree-dfa.h.
	(struct im_mem_ref): add ref_canonical flag.
	(struct mem_ref_hasher): Use ao_ref as compare_type.
	(mem_ref_hasher::equal): Adjust and add variant comparing ao_ref
	parts.
	(mem_ref_alloc): Take ao_ref parameter, initialize ref_canonical
	member.
	(gather_mem_refs_stmt): Set up ao_ref early and do the lookup
	using it.  If we have non-equal refs canonicalize the one
	in the hashtable used for insertion.
	(tree_ssa_lim_initialize): Adjust.

	* g++.dg/vect/pr84362.cc: New testcase.

From-SVN: r267296