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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 14:35:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94420

--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
cprop1 has done

LOCAL COPY-PROP: Replacing reg 2 in insn 7 with reg 118

which is wrong: the insn isn't valid after that.  But there is nothing
that expresses that, the "R" constraint "just" becomes unsatisfiable.=