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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/104446] [9/10/11/12 Regression] ICE in
 trunc_int_for_mode, at explow.cc:59 since r9-6999
Date: Thu, 10 Feb 2022 07:47:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104446

--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This testcase is invalid code of course, so anything can happen.  ICEs are =
bad
though ;-)

Please add to the comment that you don't want this substitution because it
leads
to ICEs, and mention the PR # in the comment.  But better, figure out *why*
this
ICEs later on: it is perfectly normal for combine to create RTL that is
non-sensical but structurally correct, and it should simply not pass recog.
This patch avoids the problem, and does not fix it.  It would be good to kn=
ow
what the real problem is.=