[Bug tree-optimization/91293] [8 Regression] Wrong code with -O3 -mavx2

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91293

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Aug  2 12:07:33 2019
New Revision: 274007

URL: https://gcc.gnu.org/viewcvs?rev=274007&root=gcc&view=rev
Log:
2019-08-02  Richard Biener  <rguent...@suse.de>

        Backport from mainline
        2019-07-31  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/91280
        * tree-ssa-structalias.c (get_constraint_for_component_ref):
        Decompose MEM_REF manually for offset handling.

        * g++.dg/torture/pr91280.C: New testcase.

        2019-07-31  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/91293
        * tree-vect-slp.c (vect_build_slp_tree_2): Do not swap operands
        of reduction stmts.

        * gcc.dg/vect/pr91293-1.c: New testcase.
        * gcc.dg/vect/pr91293-2.c: Likewise.
        * gcc.dg/vect/pr91293-3.c: Likewise.

Added:
    branches/gcc-9-branch/gcc/testsuite/g++.dg/torture/pr91280.C
    branches/gcc-9-branch/gcc/testsuite/gcc.dg/vect/pr91293-1.c
    branches/gcc-9-branch/gcc/testsuite/gcc.dg/vect/pr91293-2.c
    branches/gcc-9-branch/gcc/testsuite/gcc.dg/vect/pr91293-3.c
Modified:
    branches/gcc-9-branch/gcc/ChangeLog
    branches/gcc-9-branch/gcc/testsuite/ChangeLog
    branches/gcc-9-branch/gcc/tree-ssa-structalias.c
    branches/gcc-9-branch/gcc/tree-vect-slp.c