On Thu, May 20, 2021 at 4:54 PM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: Thomas, > > AMX is analogous to the multiplier used by AVX-512. > > The architectural state must exist on every CPU, including HT siblings. > > Today, the HT siblings share the same execution unit, > > and I have no reason to expect that will change. > > I'm well aware that HT siblings share the same execution unit for > AVX. > > Though AMX is if I remember the discussions two years ago correctly > shared by more than the HT siblings which makes things worse. I regret that we were unable to get together in the last year to have an updated discussion. I think if we had, then we would have saved a lot of mis-understanding and a lot of email! So let me emphasize here: There is one TMUL execution unit per core. It is shared by the HT siblings within that core. So the comparison to the AVX-512 multiplier is a good one. Len Brown, Intel Open Source Technology Center
