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coolbutuseless (@coolbutuseless) · 02/2023 · Tröts: 4.390 · Folger: 704
Do 11.07.2024 12:49
{callme} update - Writing a faster sqrt() which is 2.5x faster than R's builtin sqrt()
First I create a naive version in C, then unroll the loops, then introduce SIMD instructions.
What's really nice about the SIMD is that I wrote x86 AVX SIMD instructions and ran the code on my mac ARM CPU using the SIMDe library.
*x64 SIMD* instructions on a mac *ARM* CPU.
That's freaking wild! All thanks to the SIMDe "translation" library.
https://github.com/coolbutuseless/callme
https://github.com/simd-everywhere/simde
In-depth case study: A faster sqrt() In this case study, I am investigating a faster sqrt() in R. R’s sqrt() is already pretty fast as it calls the system math sqrt function internally. But can we go faster?? In the following sections I have written sqrt_simple() which is a naive implementation in C sqrt_unrolled() is an implementation in which I have manually unrolled the for loop. sqrt_simd_avx() which uses AVX SIMD instructions. This is particularly interesting as the code is running on macOS which doesn’t have AVX instructions!
A simple bespoke sqrt for R written in C.
A simple bespoke sqrt for R written in C with unrolled loops for faster execution.
A bespoke sqrt for R written in C which uses AVX instructions on mac ARM CPU using the SIMDe "translation" library. This is 2.5x faster than the builtin sqrt in R.
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