[Bug tree-optimization/91975] worse code for small array copy using pointer arithmetic than array indexing

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91975

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Oct  7 07:53:45 2019
New Revision: 276645

URL: https://gcc.gnu.org/viewcvs?rev=276645&root=gcc&view=rev
Log:
2019-10-07  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/91975
        * tree-ssa-loop-ivcanon.c (constant_after_peeling): Consistently
        handle invariants.

        * g++.dg/tree-ssa/ivopts-3.C: Adjust.
        * gcc.dg/vect/vect-profile-1.c: Disable cunrolli.
        * gcc.dg/vect/vect-double-reduc-6.c: Disable unrolling of
        the innermost loop.
        * gcc.dg/vect/vect-93.c: Likewise.
        * gcc.dg/vect/vect-105.c: Likewise.
        * gcc.dg/vect/pr79920.c: Likewise.
        * gcc.dg/vect/no-vfa-vect-102.c: Likewise.
        * gcc.dg/vect/no-vfa-vect-101.c: Likewise.
        * gcc.dg/vect/pr83202-1.c: Operate on a larger array.
        * gfortran.dg/vect/vect-8.f90: Likewise.
        * gcc.dg/tree-ssa/cunroll-2.c: Scan early unrolling dump instead
        of late one.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/tree-ssa/ivopts-3.C
    trunk/gcc/testsuite/gcc.dg/tree-ssa/cunroll-2.c
    trunk/gcc/testsuite/gcc.dg/vect/no-vfa-vect-101.c
    trunk/gcc/testsuite/gcc.dg/vect/no-vfa-vect-102.c
    trunk/gcc/testsuite/gcc.dg/vect/pr79920.c
    trunk/gcc/testsuite/gcc.dg/vect/pr83202-1.c
    trunk/gcc/testsuite/gcc.dg/vect/vect-105.c
    trunk/gcc/testsuite/gcc.dg/vect/vect-93.c
    trunk/gcc/testsuite/gcc.dg/vect/vect-double-reduc-6.c
    trunk/gcc/testsuite/gcc.dg/vect/vect-profile-1.c
    trunk/gcc/testsuite/gfortran.dg/vect/vect-8.f90
    trunk/gcc/tree-ssa-loop-ivcanon.c