Viewing profile — corsix

In this case, "atomic 128-bit store" is the special instruction, with the twist that half of those 128 bits contain a pointer.

You can start with this idea, and then make it _very_ performant by using bit counting instructions. See https://www.corsix.org/content/higher-quality-random-floats for an expositi…

Indeed, LuaJIT support for Windows/Arm64 was added in https://github.com/LuaJIT/LuaJIT/issues/593 , and there’s experimental out-of-tree support for Windows/Arm64EC in https://gith…

For an implementation of logical immediate encoding without the loop, see https://github.com/LuaJIT/LuaJIT/blob/04dca7911ea255f37be799...

AArch64 NEON has the URSQRTE instruction, which gets closer to the OP's question than you might think; view a 32-bit value as a fixed-precision integer with 32 fractional bits (so …

Unfortunately things aren't so simple, as when doing JIT compilation, LuaJIT _will_ try to shorten the lifetimes of local variables. Using the latest available version of LuaJIT ( …

Some compute might be on the AMX units (dedicated matrix multiplication coprocessor, closely attached to the CPU, distinct from both ANE and GPU). They gained bf16 support in M2.

close() is documented as a cancellation point, and is the kind of syscall that might crop up in a destructor.

Using your cdf framing, while there is a point about [0, 1) versus (0, 1] intervals, the bigger point of the article is about whether said cdf holds for any IEEE-754 double-precisi…

Oh, cute. It looks like they ever-so-slightly overweight the probability of values whose mantissa is entirely zeroes though. For example, the probability of hitting exactly 0.5 sho…

https://www.corsix.org/content/whirlwind-tour-aarch64-vector... is my take on NEON, albeit not quite the same form factor as the OP.

I think https://github.com/LuaJIT/LuaJIT/commit/6a2163a6b45d6d251599... improved things a bit, notably making automatic tarballs work again.

I’m pleased to see FUTEX2_SIZE_U64, but saddened that it isn’t actually implemented. It has always seemed like a very useful primitive to have.

Also interesting is that https://luajit.org/status.html now states “LuaJIT is actively developed and maintained” (whereas for the last ~5 years, “actively” isn’t a word I’d have us…

Per https://www.stateof.ai/compute , one of the players in the market has ten thousand GPUs in a private cloud. Out-computing just that one player is hard enough, let alone out-com…

The trie structure described in the article can be (ab)used to export an infinite number of symbols from a library: https://www.corsix.org/content/exporting-an-infinite-number-...

From a hardware perspective, vector instructions operate on small 1D vectors, whereas tensor instructions operate on small 2D matrices. I say “instructions”, but it’s really only m…

Assuming that you're after "round to nearest with ties toward even", then the quoted numpy code gets very close to `vcvtps2ph`, and one minor tweak gets it to bitwise identical: re…

The first niche that came to mind was x86 code running under Rosetta 2; despite ARM having an equivalent to F16C, Rosetta 2 doesn’t translate AVX, and F16C doesn’t have a non-AVX e…

Using the notation from the article, N+K is sufficient for RS(N,K). One point of confusion is that different authors use different notation; some use RS(num data shards, num parity…

The next article in blog order is one application: https://www.corsix.org/content/reed-solomon-for-software-rai... Another application is crypto: the SubBytes step of AES maps very…

Alternatively, the following pair of articles, the first of which is already referenced as a footnote in the OP: http://www.corsix.org/content/galois-field-instructions-2021... htt…

Lua gets this right - the lowering of loops (e.g. https://www.lua.org/manual/5.1/manual.html#2.4.5 ) says “var is invisible” and has “local v = var”, the latter akin to Go’s “item …