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Subject: [Bug tree-optimization/101178] SLP permute propagation doesn't
 handle VEC_PERM
Date: Thu, 01 Jul 2021 07:48:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101178

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:7d8211603a3d04384812b481b0ae01205a287a72

commit r12-1949-g7d8211603a3d04384812b481b0ae01205a287a72
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Jun 30 16:28:50 2021 +0200

    tree-optimization/101178 - handle VEC_PERM in SLP permute propagation

    This adds handling of VEC_PERM nodes to SLP permute propagation.
    Previously VEC_PERM acted as forced materialization of incoming
    permutes since it is a good place to do that (with the constraint
    of those only appearing for two-operator nodes).  The following
    patch, in addition to supporting (but not forcing) this, enables
    VEC_PERM nodes acting as "any" permute on the outgoing side since
    they also can consume arbitrary permutes on that side.

    This again (meh) changes how we represent permutes and materialization
    on the graph vertices now explicitely having the common incoming
    permute as well as an outgoing permute and in case both are
    different the vertex acts as materialization point of the incoming
    permute.

    2021-06-30  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/101178
            * tree-vect-slp.c (slpg_vertex::materialize): Remove.
            (slpg::perm_in): Add.
            (slpg::get_perm_in): Remove.
            (slpg::get_perm_materialized): Add.
            (vect_optimize_slp): Handle VEC_PERM nodes more optimally
            during permute propagation and materialization.

            * gcc.dg/vect/bb-slp-72.c: New testcase.
            * gcc.dg/vect/bb-slp-73.c: Likewise.
            * gcc.dg/vect/bb-slp-74.c: Likewise.=