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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/94873] [8/9/10/11 Regression] wrong code with
 -O -fno-merge-constants -fno-split-wide-types -fno-tree-fre
Date: Fri, 01 May 2020 18:31:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94873

--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> ---
REG_EQ* is documented as only being allowed on insns that set only one
register.  If you want to change that, you'll have to check *all* code
that consumes this, see if they rely on that fact or not, and if so,
change that.=