If there is no objection, I'm going to backport the m_SAPPHIRERAPIDS
and m_ALDERLAKE change to GCC 12.
Uros Bizjak via Gcc-patches <gcc-patches@gcc.gnu.org> 于2022年12月7日周三 15:11写道：
>
> On Wed, Dec 7, 2022 at 7:36 AM Hongyu Wang <hongyu.w...@intel.com> wrote:
> >
> > For Alderlake there is similar issue like PR 81616, enable
> > avoid_fma256_chain will also benefit on Intel latest platforms
> > Alderlake and Sapphire Rapids.
> >
> > Bootstrapped/regtested on x86_64-pc-linux-gnu{-m32,}.
> >
> > Ok for master?
> >
> > gcc/ChangeLog:
> >
> > * config/i386/x86-tune.def (X86_TUNE_AVOID_256FMA_CHAINS): Add
> > m_SAPPHIRERAPIDS, m_ALDERLAKE and m_CORE_ATOM.
>
> OK.
>
> Thanks,
> Uros.
>
> > ---
> > gcc/config/i386/x86-tune.def | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/gcc/config/i386/x86-tune.def b/gcc/config/i386/x86-tune.def
> > index cd66f335113..db85de20bae 100644
> > --- a/gcc/config/i386/x86-tune.def
> > +++ b/gcc/config/i386/x86-tune.def
> > @@ -499,7 +499,8 @@ DEF_TUNE (X86_TUNE_AVOID_128FMA_CHAINS,
> > "avoid_fma_chains", m_ZNVER)
> >
> > /* X86_TUNE_AVOID_256FMA_CHAINS: Avoid creating loops with tight 256bit or
> > smaller FMA chain. */
> > -DEF_TUNE (X86_TUNE_AVOID_256FMA_CHAINS, "avoid_fma256_chains", m_ZNVER2 |
> > m_ZNVER3)
> > +DEF_TUNE (X86_TUNE_AVOID_256FMA_CHAINS, "avoid_fma256_chains", m_ZNVER2 |
> > m_ZNVER3
> > + | m_ALDERLAKE | m_SAPPHIRERAPIDS | m_CORE_ATOM)
> >
> > /* X86_TUNE_V2DF_REDUCTION_PREFER_PHADDPD: Prefer haddpd
> > for v2df vector reduction. */
> > --
> > 2.18.1
> >
