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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/110935] Missed BB reduction vectorization
 because of missed eliding of a permute
Date: Mon, 07 Aug 2023 13:30:34 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110935

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |x86_64-*-*
      Known to fail|                            |13.2.1, 14.0
                 CC|                            |rsandifo at gcc dot gnu.org
           Keywords|                            |missed-optimization

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I didn't find where we make sure to elide the "outgoing" permute of a
reduction, but I think we only have testcases for the loop vectorization ca=
se.=20
Can you suggest where we'd do this?  Note we do not represent the plus
reduction
operation but the whole SLP instance has just a single node (with load
permutation)=