re PR target/88834 ([SVE] Poor addressing mode choices for LD2 and ST2)

re PR target/88834 ([SVE] Poor addressing mode choices for LD2 and ST2)

gcc/ChangeLog:

2019-06-13  Kugan Vivekanandarajah  <kugan.vivekanandarajah@linaro.org>

	PR target/88834
	* tree-ssa-loop-ivopts.c (get_mem_type_for_internal_fn): Handle
	IFN_MASK_LOAD_LANES and IFN_MASK_STORE_LANES.
	(get_alias_ptr_type_for_ptr_address): Likewise.
	(add_iv_candidate_for_use): Add scaled index candidate if useful.
	* tree-ssa-address.c (preferred_mem_scale_factor): New.
	* config/aarch64/aarch64.c (aarch64_classify_address): Relax
	allow_reg_index_p.

gcc/testsuite/ChangeLog:

2019-06-13  Kugan Vivekanandarajah  <kugan.vivekanandarajah@linaro.org>

	PR target/88834
	* gcc.target/aarch64/pr88834.c: New test.
	* gcc.target/aarch64/sve/struct_vect_1.c: Adjust.
	* gcc.target/aarch64/sve/struct_vect_14.c: Likewise.
	* gcc.target/aarch64/sve/struct_vect_15.c: Likewise.
	* gcc.target/aarch64/sve/struct_vect_16.c: Likewise.
	* gcc.target/aarch64/sve/struct_vect_17.c: Likewise.
	* gcc.target/aarch64/sve/struct_vect_7.c: Likewise.

From-SVN: r272232