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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/101668] BB vectorizer doesn't handle lowpart
 of existing vector
Date: Fri, 20 May 2022 09:03:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101668

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot =
gnu.org
             Status|NEW                         |ASSIGNED

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Some pending enhancements would allow us to use VEC_PERM_EXPR with different
input modes from output mode and thus make implementation of this easier.
vectorizable_slp_permutation doesn't yet support that though.

For the special case of a contiguous permutation we can also vectorize it
as BIT_FIELD_REF of course.=