re PR tree-optimization/88440 (size optimization of memcpy-like code)

re PR tree-optimization/88440 (size optimization of memcpy-like code)

2019-05-23  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/88440
	* opts.c (default_options_table): Enable -ftree-loop-distribute-patterns
	at -O[2s]+.
	* tree-loop-distribution.c (generate_memset_builtin): Fold the
	generated call.
	(generate_memcpy_builtin): Likewise.
	(distribute_loop): Pass in whether to only distribute patterns.
	(prepare_perfect_loop_nest): Also allow size optimization.
	(pass_loop_distribution::execute): When optimizing a loop
	nest for size allow pattern replacement.

	* gcc.dg/tree-ssa/ldist-37.c: New testcase.
	* gcc.dg/tree-ssa/ldist-38.c: Likewise.
	* gcc.dg/vect/vect.exp: Add -fno-tree-loop-distribute-patterns.
	* gcc.dg/tree-ssa/ldist-37.c: Adjust.
	* gcc.dg/tree-ssa/ldist-38.c: Likewise.
	* g++.dg/tree-ssa/pr78847.C: Likewise.
	* gcc.dg/autopar/pr39500-1.c: Likewise.
	* gcc.dg/autopar/reduc-1char.c: Likewise.
	* gcc.dg/autopar/reduc-7.c: Likewise.
	* gcc.dg/tree-ssa/ivopts-lt-2.c: Likewise.
	* gcc.dg/tree-ssa/ivopts-lt.c: Likewise.
	* gcc.dg/tree-ssa/predcom-dse-1.c: Likewise.
	* gcc.dg/tree-ssa/predcom-dse-2.c: Likewise.
	* gcc.dg/tree-ssa/predcom-dse-3.c: Likewise.
	* gcc.dg/tree-ssa/predcom-dse-4.c: Likewise.
	* gcc.dg/tree-ssa/prefetch-7.c: Likewise.
	* gcc.dg/tree-ssa/prefetch-8.c: Likewise.
	* gcc.dg/tree-ssa/prefetch-9.c: Likewise.
	* gcc.dg/tree-ssa/scev-11.c: Likewise.
	* gcc.dg/vect/costmodel/i386/costmodel-vect-31.c: Likewise.
	* gcc.dg/vect/costmodel/i386/costmodel-vect-33.c: Likewise.
	* gcc.dg/vect/costmodel/x86_64/costmodel-vect-31.c: Likewise.
	* gcc.dg/vect/costmodel/x86_64/costmodel-vect-33.c: Likewise.
	* gcc.target/i386/pr30970.c: Likewise.
	* gcc.target/i386/vect-double-1.c: Likewise.
	* gcc.target/i386/vect-double-2.c: Likewise.
	* gcc.dg/tree-ssa/gen-vect-2.c: Likewise.
	* gcc.dg/tree-ssa/gen-vect-26.c: Likewise.
	* gcc.dg/tree-ssa/gen-vect-28.c: Likewise.
	* gcc.dg/tree-ssa/gen-vect-32.c: Likewise.
	* gfortran.dg/vect/vect-5.f90: Likewise.
	* gfortran.dg/vect/vect-8.f90: Likewise.

From-SVN: r271553