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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94420] [8/9/10 Regression] ICE error: insn does not
 satisfy its constraints
Date: Tue, 31 Mar 2020 14:36:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94420

--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
It is undefined behaviour to access such a register in any way -- sure,
you *can* inspect it, there just is no guarantee at all what value you
will get.

It still is a useful thing to do in debug code and the like, of course.=