GIMPLE store merging pass

GIMPLE store merging pass

2016-10-28  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	PR middle-end/22141
	* Makefile.in (OBJS): Add gimple-ssa-store-merging.o.
	* common.opt (fstore-merging): New Optimization option.
	* opts.c (default_options_table): Add entry for
	OPT_ftree_store_merging.
	* fold-const.h (can_native_encode_type_p): Declare prototype.
	* fold-const.c (can_native_encode_type_p): Define.
	* params.def (PARAM_STORE_MERGING_ALLOW_UNALIGNED): Define.
	(PARAM_MAX_STORES_TO_MERGE): Likewise.
	* timevar.def (TV_GIMPLE_STORE_MERGING): New timevar.
	* passes.def: Insert pass_tree_store_merging.
	* tree-pass.h (make_pass_store_merging): Declare extern
	prototype.
	* gimple-ssa-store-merging.c: New file.
	* doc/invoke.texi (Optimization Options): Document
	-fstore-merging.
	(--param documentation): Document store-merging-allow-unaligned
	and max-stores-to-merge.

2016-10-28  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
            Jakub Jelinek  <jakub@redhat.com>
            Andrew Pinski  <pinskia@gmail.com>

	PR middle-end/22141
	PR rtl-optimization/23684
	* gcc.c-torture/execute/pr22141-1.c: New test.
	* gcc.c-torture/execute/pr22141-2.c: Likewise.
	* gcc.target/aarch64/ldp_stp_1.c: Adjust for -fstore-merging.
	* gcc.target/aarch64/ldp_stp_4.c: Likewise.
	* gcc.dg/store_merging_1.c: New test.
	* gcc.dg/store_merging_2.c: Likewise.
	* gcc.dg/store_merging_3.c: Likewise.
	* gcc.dg/store_merging_4.c: Likewise.
	* gcc.dg/store_merging_5.c: Likewise.
	* gcc.dg/store_merging_6.c: Likewise.
	* gcc.dg/store_merging_7.c: Likewise.
	* gcc.target/i386/pr22141.c: Likewise.
	* gcc.target/i386/pr34012.c: Add -fno-store-merging to dg-options.
	* g++.dg/init/new17.C: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@241649 138bc75d-0d04-0410-961f-82ee72b054a4