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From: "olegendo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111001] SH: ICE during RTL pass: sh_treg_combine2
Date: Fri, 13 Oct 2023 06:03:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111001

--- Comment #3 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to Oleg Endo from comment #2)
> I've briefly tried on a local gcc version 13.1.1 20230714=20
>=20
> While it doesn't crash, the sh_treg_combine2 pass seems to be stuck in an
> infinite loop.  It produces a log file > 200 MByte.

It trips on the following insn:

(insn 1431 1430 179 19 (set (reg/v:DI 264 [ blk_cnt ])
        (reg/v:DI 264 [ blk_cnt ])) "rw_bitmaps.c":341:11 -1
     (nil))

... which is a reg-reg move on itself (i.e. a nop).  For some reason this i=
nsn
is emitted by the split1 pass, which runs before sh_treg_combine2.=