https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112572
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |ebotcazou at gcc dot gnu.org
--- 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 explicitly.
