Viewing profile — Remnant44

This was an unexpected find on HN but I found it very moving. Good writing lets you do something that is almost impossible otherwise; to get a glimpse inside someone else's mind an…

I haven't had a chance to dig into the repo at all, so that's excellent, thank you!

Looks very promising - I've been looking for a good delaunay library that supports constrained delaunay. It looks like their performance benchmark is including multithreading, whic…

Do you have any sources for this? I have also heard of rabbit starvation many times over the years, and it has always been in the context of too taking in too little fat -- essenti…

I agree with you, but also: outside of anything else, amdahls law means that as the parallel performance grows, we become _more_ limited by the inherently serial code, and thus sin…

It's a little dramatic to say avx512 is dead versus 10 - rather, I would say that avx10 finalizes a universally available set of avx512 extensions. For AVX 10.1, there's essentiall…

There's a whole lot of us out there. I don't know if there's still a future in the thing that I love, which is where all the malaise comes from.

I love me some isa extension, I'd love to know what these are intended and useful for for though. 1 bit inference? I hear they could be useful in crypto as well, but that's out of …

While you may be correct in the sense that, in a public acquisition statement, people should be inferring enormous context and not taking anything said at face value. It's simultan…

Fort what it's worth, I had the exact same experience you did when I started writing SIMD code explicitly with intrinsics. I avoided it for a long time because, well, it was so dam…

AVX doesn't require alignment of any memory operands, with the exception of the specific load aligned instruction. So you/the compiler are free to use the reg,mem form interchangib…

There are many situations where your data is essentially _majority_ unaligned. Considerable effort by the hardware guys has gone into making that situation work well. A great examp…

which honestly, shouldn't be neccessary today with avx512. There's essentially no reason to prefer the aligned load/store commands over the unaligned ones - if the actual pointer i…

In practical use for simd, various min/max operations. On Intel at least, they propagate nan or not based on operand order

I've run into this as well. Problem is that linear RGB is most definitely not a perceptually uniform space, so blending in it frequently does something different than you want. Use…

Essentially ever other use case for a computer. Whether you're playing games, or editing videos, or doing 3D work, or trying to digest the latest bloated react mess on some website…

I've had just the smallest touch of this caring for my elderly parents, and you have my deep empathy. It's exhausting and really really hard.

totally - especially given how bandwidth constrained CPUs still are, going wider than 512 doesn't make much sense. 512 itself was a stretch for quite a long time (and all the negat…

Sure.. in detail and abstracted slightly, the byte table problem: Maybe you're remapping RGB values [0..255] with a tone curve in graphics, or doing a mapping lookup of IDs to inde…

Yes and no. I think neon is undersized for today at 128bit registers -- if you're working with doubles for example, that's only two values per register, which is pretty anemic. Thi…

I'm just happy that finally, with the popularity of zen4 and 5 chips, AVX512 is around ~20% of the running hardware in the steam hardware survey. It's going to be a long while befo…

I think the most interesting thing here is the near-lack of NUMA effects on memory access, giving fairly easy to achieve high bandwidth memory. Combined with the double-width fabri…

For sure.. for what it's worth though, I have run across several references to arm also implementing uop caches as a power optimization versus just running the decoders, so I'm inc…

I was going to mention this as well. Source: chipsandcheese.com memory latency graphs

ARM instructions are fixed size, while x86 are variable. This makes a wide decoder fairly trivial for ARM, while it is complex and difficult for x86. However, this doesn't really h…