2013-03-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/39326
	* tree-ssa-loop-im.c (refs_independent_p): Exploit symmetry.
	(struct mem_ref): Replace mem member with ao_ref typed member.
	(MEM_ANALYZABLE): Adjust.
	(memref_eq): Likewise.
	(mem_ref_alloc): Likewise.
	(gather_mem_refs_stmt): Likewise.
	(mem_refs_may_alias_p): Use the ao_ref to query the alias oracle.
	(execute_sm_if_changed_flag_set): Adjust.
	(execute_sm): Likewise.
	(ref_always_accessed_p): Likewise.
	(refs_independent_p): Likewise.
	(can_sm_ref_p): Likewise.

From-SVN: r196768