tree-ssa-sccvn.c (init_vn_nary_op_from_pieces): New function.
* tree-ssa-sccvn.c (init_vn_nary_op_from_pieces): New function.
(init_vn_nary_op_from_op): New function.
(init_vn_nary_op_from_stmt): New function.
(vn_nary_op_lookup_1): New function.
(sizeof_vn_nary_op): New function.
(alloc_vn_nary_op_noinit): New function.
(alloc_vn_nary_op): New function.
(vn_nary_op_insert_into): New function.
(vn_nary_op_lookup_pieces): Rewrite to use new helper functions.
(vn_nary_op_lookup): Likewise.
(vn_nary_op_lookup_stmt): Likewise.
(vn_nary_op_insert_pieces): Likewise.
(vn_nary_op_insert): Likewise.
(vn_nary_op_insert_stmt): Likewise.
(copy_nary): Likewise.
(set_value_id_for_result): New function.
(set_hashtable_value_ids): Call it.