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From: "tschwinge at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/102302] [12 Regression] ICE during RTL pass: expand:
 in gen_lowpart_general, at rtlhooks.c:57
Date: Mon, 13 Sep 2021 08:49:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102302

Thomas Schwinge <tschwinge at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
                 CC|                            |liuhongt at gcc dot gnu.or=
g,
                   |                            |tschwinge at gcc dot gnu.o=
rg
   Last reconfirmed|                            |2021-09-13
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
I've ran into this, too, and found that it's due to recent commit
r12-3457-g57b7c432cce893e1ba60d9b94a9606df6b419379 'Revert "Get rid of all
float-int special cases in validate_subreg."'.=