[Bug tree-optimization/69882] [6 regression] Excessive reduction statements generated by SLP

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69882

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Feb 22 14:53:17 2016
New Revision: 233605

URL: https://gcc.gnu.org/viewcvs?rev=233605&root=gcc&view=rev
Log:
2016-02-22  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/69882
        * tree-vect-slp.c (vect_attempt_slp_rearrange_stmts): Properly
        preserve permutations present because of gaps.
        (vect_supported_load_permutation_p): Always continue checking
        permutations after vect_attempt_slp_rearrange_stmts.

        * gfortran.dg/vect/pr69882.f90: New testcase.

Added:
    trunk/gcc/testsuite/gfortran.dg/vect/pr69882.f90
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-slp.c