Sunny Cove wide

By: anon (spam.delete.delete.delete@this.this.this.spam.com), December 13, 2018 1:11 pm
Room: Moderated Discussions
Travis Downs (travis.downs.delete@this.gmail.com) on December 13, 2018 11:27 am wrote:
> anon (spam.delete.delete.delete@this.this.this.spam.com) on December 13, 2018 11:09 am wrote:
> > Either way a third 512b unit seems unlikely and the leap from "port 1 gets 512b
> > shuffles" to "port 1 gets its own 512b with shuffles and FMA" seems a bit far.
>
> Yes, if I had to guess I'd say ICL retains 2 512b units. The p1 shuffle
> and hence the breaking of the p0/p1 symmetry thing is weird though.
>
> These chips already have 512b of shuffle units on p5, so if you wanted to add just another 256b of shuffle
> throughput, it seems like you'd just re-use that hardware, not put another 256b unit on p1. So maybe the slides
> are wrong, or maybe p1 now has access to the other half of the 512p hardware behind p5 or something else.
>

I'd guess that they've either added the 256b hardware because it's cheap enough and chose port 1 to not have all asymmetric hardware (fpDIV + shuffle) on the same unit or it's actually a 512b shuffle unit and they just didn't want shuffles on all 3 ports, similar to how SKL-X doesn't get 256b FMA on port 5.

> >
> > Either way two shuffle ports are nice to have. Even if they are not 512b it's
> > still nice getting the same throughput with 256b without having to use AVX512
> > or getting a massive boost when you actually want independent 256b shuffles.
>
> Definitely. It's been a decade of writing code that uses more blends but
> fewer shuffles or whatever to get around p5 shuffle pressure. This would
> provide a nice boost to a lot of those things (after a re-write though!).
>
>

I forgot to mention it would also help for code that isn't quite as optimized or simply can't substitute shuffles without a rewrite.
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