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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/112572] [14 regression] LLVM miscompiled since
 r14-5355-g3cd3a09b3f91a1
Date: Sun, 19 Nov 2023 09:24:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112572

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ebotcazou at gcc dot gnu.o=
rg

--- Comment #26 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Eric B. mentioned back in 2011, neither REG_DEAD nor REG_UNUSED needs to =
be
> kept up to date:
> https://gcc.gnu.org/pipermail/gcc-patches/2011-October/326733.html
> Also see PR 48773 where he mentioned the same.
> He mentioned the same thing again in 2018 even:
> https://gcc.gnu.org/pipermail/gcc-patches/2018-October/508057.html

REG_DEAD and REG_UNUSED notes are recomputed by DF so they do not need to be
maintained explicitly (although you may do it of course).  REG_EQUAL and
REG_EQUIV notes are not recomputed by DF so they need to maintained explici=
tly.=