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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113133] [14 Regression] ICE: SIGSEGV in
 mark_label_nuses(rtx_def*) (emit-rtl.cc:3896) with -O -fno-tree-ter -mavx512f
 -march=barcelona
Date: Thu, 28 Dec 2023 19:36:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113133

Uro=C5=A1 Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-12-28
             Status|UNCONFIRMED                 |ASSIGNED
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |ubizjak at gmail do=
t com

--- Comment #1 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
Created attachment 56962
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D56962&action=3Dedit
Proposed patch

Patch in testing.

lowpart_subreg can't handle:

lowpart_subreg (V4SFmode, operands[0], DFmode);

and

lowpart_subreg (V2DFmode, operands[0], SFmode);

subreg conversions and will return NULL_RTX for these cases.=