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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/109676] [13/14 regression] ICE in simplify_subreg, at
 simplify-rtx.cc:7426 when building firefox with -O2 -march=alderlake -g since
 r13-3378-gf6c168f8c06047
Date: Mon, 01 May 2023 09:13:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109676

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gn=
u.org

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This looks like a STV bug to me.  Before the stv pass, we have correct
(debug_insn 114 47 51 8 (var_location:TI D#3 (reg:TI 91 [ p ])) -1
     (nil))
but stv changes that to invalid
(debug_insn 114 47 51 8 (var_location:TI D#3 (reg:V1TI 91 [ p ])) -1
     (nil))
where the modes no longer match.  Will have a look...=