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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/101995] [9/10/11/12 Regression] regression
 built-in memset missed-optimization arm -Os since r9-3594
Date: Wed, 08 Dec 2021 20:50:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101995

--- Comment #9 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #7)
> What is this REG_RETURNED thing?

Ah, something added in ira-lives.c, and you call *that* code fragile?
I agree :-)=