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From: "kevin.bracey at alifsemi dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107714] New: MVE: Invalid addressing mode generated for
 VLD2
Date: Wed, 16 Nov 2022 12:56:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107714

            Bug ID: 107714
           Summary: MVE: Invalid addressing mode generated for VLD2
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kevin.bracey at alifsemi dot com
  Target Milestone: ---

Created attachment 53909
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53909&action=3Dedit
Stripped-down reproducer source

While I was working on some Helium intrinsics, GCC produced some invalid co=
de,
meaning my optimisation can only be enabled in our armclang builds. Problem
seems to be still present on GCC trunk.

Posted at https://godbolt.org/z/h3EhMvxao

Compilation options -O2 -mcpu=3Dcortex-m55 -mfloat-abi=3Dhard

Error: instruction does not accept this addressing mode -- `vld21.8
{q4,q5},[r3],r2'

Compiler Explorer output for trunk shows the same invalid addressing mode.

(It also shows non-existent registers q8 and up in use - I don't know why. =
Not
a problem in my local GCC, obtained from Arm's embedded distribution).=