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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99781] [11 Regression] ICE in partial_subreg_p, at
 rtl.h:3144
Date: Tue, 30 Mar 2021 10:57:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99781

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rsandifo at gcc dot gnu.or=
g,
                   |                            |vmakarov at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Seems in *.ira dump the v1 (33) register is only used in OImode, so
reg->biggest_mode being E_OImode makes sense.
But for some reason LRA has added
     (expr_list:REG_DEAD (reg:VNx8BF 33 v1)
and the code is unhappy to see partial_subreg_p called for unordered modes.=