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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99025] [11 Regression] ICE Segmentation fault since
 r11-6351-g12ae2bc70846a2be
Date: Tue, 09 Feb 2021 18:51:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99025

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

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

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 50154
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50154&action=3Dedit
gcc11-pr99025.patch

Untested fix.
The problem is that when simplify_gen_subreg is called on a SUBREG and
simplify_subreg fails to simplify it, because of mismatching element mode as
well as mismatching size, then simplify_gen_subreg just returns NULL instea=
d of
creating the subreg.  The patch forces those SUBREGs into regs so that
simplify_gen_subreg will then always work.=