[Bug tree-optimization/83232] fma3d spec2000 regression on zen with -Ofast (generic tuning) after r255268 by missed SLP oppurtunity

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83232

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Dec  1 13:33:40 2017
New Revision: 255307

URL: https://gcc.gnu.org/viewcvs?rev=255307&root=gcc&view=rev
Log:
2017-12-01  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/83232
        * tree-vect-data-refs.c (vect_analyze_data_ref_accesses): Fix
        detection of same access. Instead of breaking the group here
        do not consider the duplicate.  Add comment explaining real fix.

        * gfortran.dg/vect/pr83232.f90: New testcase.

Added:
    trunk/gcc/testsuite/gfortran.dg/vect/pr83232.f90
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-data-refs.c