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From: "stammark at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/110255] New: arm: MVE intrinsics C++ polymorphism with
 -flax-vector-conversions
Date: Wed, 14 Jun 2023 17:24:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110255

            Bug ID: 110255
           Summary: arm: MVE intrinsics C++ polymorphism with
                    -flax-vector-conversions
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: stammark at gcc dot gnu.org
  Target Milestone: ---

Hi all,
See: https://godbolt.org/z/53ME1fGfM

The compiler with the error is the one that is using -flax-vector-conversio=
ns
through the C++ frontend.
Unsure if this is something to do with the C++ front-end or something in the
target backend (and how the builtins are registered with the front-end).

This seems to happen regardless of if the vaddq intrinsic has been
"restructured" by Christophe's
https://gcc.gnu.org/pipermail/gcc-patches/2023-April/615997.html (so going =
back
to older GCC12,13 still gives the error), but another intrinsic, like vbicq,
doesn't give the error at all (although that has a different context of the
`int` immediate having to be a compile-time constant).
(clang handles all this fine FWIW)

Has anyone seen this kind of thing before, have any ideas on workarounds, or
have any insight on if this this invalid C++ to begin with?=