[Bug tree-optimization/88440] size optimization of memcpy-like code

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88440

--- Comment #25 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri May 24 08:48:14 2019
New Revision: 271595

URL: https://gcc.gnu.org/viewcvs?rev=271595&root=gcc&view=rev
Log:
2019-05-23  Richard Biener  <rguent...@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.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ldist-37.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ldist-38.c