[Bug tree-optimization/66051] can't vectorize reductions inside an SLP group

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66051

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Dec  3 11:26:56 2015
New Revision: 231225

URL: https://gcc.gnu.org/viewcvs?rev=231225&root=gcc&view=rev
Log:
2015-12-03  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/66051
        * tree-vect-slp.c (vect_build_slp_tree_1): Remove restriction
        on load group size.  Do not pass in vectorization_factor.
        (vect_transform_slp_perm_load): Do not require any permute support.
        (vect_build_slp_tree): Do not pass in vectorization factor.
        (vect_analyze_slp_instance): Do not compute vectorization
        factor estimate.  Use vector size instead of vectorization factor
        estimate to split store groups for BB vectorization.

        * gcc.dg/vect/slp-42.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/vect/slp-42.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-slp.c