2011-12-05  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/50904
	* tree-ssa-loop-im.c (struct mem_ref): Remove vops member.
	(MEM_ANALYZABLE): New.
	(memory_references): Remove clobbered_vops and vop_ref_map
	members, add all_refs_stored_in_loop member.
	(memref_free): Adjust.
	(mem_ref_alloc): Likewise.
	(gather_mem_refs_stmt): Do not record clobbers, instead
	record refs for unanalyzable stmts.
	(gather_mem_refs_in_loops): Do not propagate clobbers.
	(struct vop_to_refs_elt, vtoe_hash, vtoe_eq, vtoe_free,
	record_vop_access, get_vop_accesses, get_vop_stores,
	add_vop_ref_mapping): Remove.
	(create_vop_ref_mapping_loop): Adjust to simply record all
	stores.
	(analyze_memory_references): Adjust.
	(refs_independent_p): Check for not analyzable refs.
	(can_sm_ref_p): Likewise.
	(ref_indep_loop_p_1): Simplify.
	(tree_ssa_lim_finalize): Adjust.

	* tree-ssa-loop-im.c (stmt_cost): Simplify, use LIM_EXPENSIVE
	rather than magic constants.  Assign zero cost to PAREN_EXPR
	and SSA_NAME copies.  Assign cost proportional to the vector
	size for vector constructors.

From-SVN: r182010