Viewing profile — janwas

That is not at all my experience :) Please expand on what "vertically-oriented scope" means.

If you are running on large-scale data, have you validated at that scale (comparing results)? From a quick look at the code, it looks like there is a 42-bit hash (computed via sing…

hm, maybe not so trivially correct here. Do I understand correctly that incorrect results can happen as a result of a 42-bit hash collision? That could happen after less than one M…

Author/Highway TL here. Happy to discuss.

Impressive result. Congrats!

Oops, the final T got cut off somehow, sorry about that. https://gcc.godbolt.org/z/KM3ben7ET

Any suggestions for improvement? We went through >5 iterations of the dispatching and I am fairly confident this is about as good as it gets in current C++. I suppose "macro hell" …

Working on one together with fastcode.org :)

To be clear, "better abstractions" here seems to mean macros for assembly language. To each their own. What bothers me is advocating for this, or denigrating more generally useful …

Correction (typo): Z13 lacks fp32.

Oh, interesting :) I meant Fastcode.org.

Is this a good faith reply? The particular abstraction we built, and is being discussed, is manifestly and obviously not a lowest common denominator. Looks like you are deploying a…

?? Where did you see mention of AI?

Thanks for sharing. The first link seems non public indeed. I can imagine there is some compile issue we could reasonably fix, with the help of someone who has Z13 access. Please e…

Fair point. If it helps, our security team has called Highway critical infrastructure and helped to harden the repo. The flip side of standardization is that it would be much harde…

:) I figure there is always something left to improve. For some kernels which really want to keep 30+ live registers, the compiler might not do as good a job as careful manual tuni…

Yes, the EMU128 target is scalar only, with for loops. This is a fun way to see how well autovectorization works, with the same source code. That works on any CPU. Curious which pr…

In such discussions, whenever you mention abstractions are universally "pretty poor", to the extent anyone is listening, I think this hyperbole can do real damage. Maybe it prevent…

This works today :) Highway provides such an abstraction for arbitrary vector lengths and maps them to intrinsics. All on the library level, no need to wait years for compiler or l…

:) I agree a tutorial would be helpful. We are working on one with Fastcode.

Have you considered our Highway library? Runtime dispatch need not be a PITA :) It's basically portable intrinsics, and a much more complete set (>300) than the ~50 in std.

Highway TL here. I agree with the main points, with a few clarifications: > tag-dispatched free functions like hn::Mul(d, a, b) We only require tags for certain ops, mainly memory,…

Looks like the ratification plan for Zvzip is November. So maybe 3y until HW is actually usable? That's a neat trick with wmacc, congrats. But still, half the speed for quite a fun…

(Personal opinion) I get the impression that RISC-V-related discussions often lack of awareness of prior work/alternatives. A large amount of (x86) software actually uses our Highw…

:D Your code was nicely written and it was a pleasure to port to SIMD because it was already very data-parallel.