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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/101895] [11 Regression] SLP Vectorizer change
 pushes VEC_PERM_EXPR into bad location spoiling further optimization
 opportunities
Date: Wed, 16 Mar 2022 07:10:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101895

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|12.0                        |11.3
            Summary|[11/12 Regression] SLP      |[11 Regression] SLP
                   |Vectorizer change pushes    |Vectorizer change pushes
                   |VEC_PERM_EXPR into bad      |VEC_PERM_EXPR into bad
                   |location spoiling further   |location spoiling further
                   |optimization opportunities  |optimization opportunities
      Known to work|                            |12.0
         Resolution|FIXED                       |---
             Status|RESOLVED                    |NEW

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk, keeping for reference purposes (backporting is not intended=
).=20
There's also still the possibility to improve how the vectorizer handles th=
is
instead of fixing up after the fact (but that's for the future).=