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This is about Skylake rather than Zen2 but it's fascinating, if the subject of what's-really-in-a-register-file is fascinating to you: https://travisdowns.github.io/blog/2020/05/26/kreg2.html



When I still read architecture docs like novels, there was a group experimenting with processor-in-memory architectures. Where the demo was Memory chips doing vector processing of data in parallel.

I wonder how wide SIMD has to get before you treat it like a CPU embedded into cache memory.

Though I guess we are already looking at SIMD instructions wider than a cache line…




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