Spent 1h today trying to implement an equivalent of vpermilps (_mm_permutevar_ps) in SSE, only to find that my "solution" used a per-lane shift (vpsrlvd)… which is only available in AVX2 🙄 SIMD on Intel is really the Swiss cheese of APIs; so difficult to do anything without an extensive knowledge of all the quirks and holes in the API. In the end the correct solution was to use pshufb, which is probably obvious if you’re familiar enough with SIMD but requires jumping through hoops. #simd #sse

Spent 1h today trying to implement an equivalent of vpermilps (_mm_permutevar_ps) in SSE, only to find that my "solution" used a per-lane shift (vpsrlvd)… which is only available in AVX2 🙄 SIMD on Intel is really the Swiss cheese of APIs; so difficult to do anything without an extensive knowledge of all the quirks and holes in the API. In the end the correct solution was to use pshufb, which is probably obvious if you’re familiar enough with SIMD but requires jumping through hoops. #simd #sse

High-performance C++ hash table using grouped SIMD metadata scanning

https://github.com/Cranot/grouped-simd-hashtable

#HackerNews #HighPerformance #C++ #HashTable #SIMD #MetadataScanning #TechnologyOptimization #GitHub

SIMD City: Auto-Vectorisation

https://xania.org/202512/20-simd-city

#HackerNews #SIMD #City #Auto-Vectorisation #SIMD #City #Vectorisation #Tech #News #Programming #Insights

Hey all! 👋🏻
I’m looking for some shader-like pipeline/#rendering system/library/framework for 1-bit graphics with 2x #framebuffer (double-buffered — actual & previous) with #blitting on #SIMD and #SWAR? CPU-only, mostly targeting ARM32/64/Thumb1.
I understand that it’s rare and mostly impossible to exist, so I just need some source-based guidance/hints of oldschool/demoscene- tricks and algorithms which I don’t know yet (I know a lot already, I’m 40)) and of course i can port.

The state of SIMD in Rust in 2025

https://shnatsel.medium.com/the-state-of-simd-in-rust-in-2025-32c263e5f53d

#HackerNews #SIMD #Rust #2025 #RustProgramming #Technology #Trends #FutureDevelopment

A story about never ever giving up...❤️‍🔥

After several weeks, questioning my life choices, I've finally figured out why my #Whisper #SpeechToText system had been so slow on #Windows:

It was because apparently the #Rust-FFI wrapped #CPlusPlus code (Whisper.cpp) didn't compile with AVX and AVX2 enabled ( #SIMD!). I've tried it on two Windows machines (both AVX-capable). On one of the machines, with #Linux, it has successfully detected AVX/AVX2, though and has run fast.

1/?

A story about never ever giving up...❤️‍🔥

After several weeks, questioning my life choices, I've finally figured out why my #Whisper #SpeechToText system had been so slow on #Windows:

It was because apparently the #Rust-FFI wrapped #CPlusPlus code (Whisper.cpp) didn't compile with AVX and AVX2 enabled ( #SIMD!). I've tried it on two Windows machines (both AVX-capable). On one of the machines, with #Linux, it has successfully detected AVX/AVX2, though and has run fast.

1/?

I decided to share my Arm NEON optimizations for the FFmpeg Cinepak encoder. On Apple Silicon / RPI / NEON 32/64-bit, it gets a 250-300% speedup for encoding:

https://github.com/bitbank2/FFmpeg-in-Xcode

#FOSS
#Optimization
#SIMD
#NEON