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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/109093] [13 regression] csmith: a February runtime bug ?
Date: Wed, 15 Mar 2023 19:50:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109093

--- Comment #21 from H.J. Lu <hjl.tools at gmail dot com> ---
REG_EQUIV is added by IRA:

          if (DF_REG_DEF_COUNT (regno) =3D=3D 1
              && note
              && !rtx_varies_p (XEXP (note, 0), 0)
              && (!may_trap_or_fault_p (XEXP (note, 0))
                  || def_dominates_uses (regno)))=20
            {
              rtx note_value =3D XEXP (note, 0);
              remove_note (insn, note);
              set_unique_reg_note (insn, REG_EQUIV, note_value);
            }=