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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/116609] New: Live lane vectorization does not
 support SLP with loop masking
Date: Thu, 05 Sep 2024 08:42:21 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 15.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D116609

            Bug ID: 116609
           Summary: Live lane vectorization does not support SLP with loop
                    masking
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

It should be trivial to support for single-lane SLP (testing a patch for th=
at)
but also multi-lane might be supportable, for example using slide up/down
or easier when the number of lanes is power-of-two use a larger element
lastb extract.

In general when SLP discovery gets us multi-lanes and that fails we current=
ly
scrap the respective SLP instance but we might want to split it up to a set
of single-lane instances (also avoiding re-discovery).=