1min snip

Embedded cover image

477: One Thousand New Instructions

Embedded

NOTE

SIMD on a Cortex-M4 Processor

A significant performance improvement of 16x was achieved by avoiding re-initializing the histogram for every pixel, transitioning from O(N^2) to O(2N) complexity. This optimization is crucial for MCUs, where even small changes make a massive difference. By leveraging SIMD on a Cortex-M4 processor, it is possible to compute multiple columns of the histogram simultaneously, by utilizing a specific instruction that operates on four bytes at a time. This capability has been available in Cortex-M4 processors for over a decade, enabling parallel additions and preventing overflow, thereby enhancing computational efficiency.

00:00

Get the Snipd
podcast app

Unlock the knowledge in podcasts with the podcast player of the future.
App store bannerPlay store banner

AI-powered
podcast player

Listen to all your favourite podcasts with AI-powered features

Discover
highlights

Listen to the best highlights from the podcasts you love and dive into the full episode

Save any
moment

Hear something you like? Tap your headphones to save it with AI-generated key takeaways

Share
& Export

Send highlights to Twitter, WhatsApp or export them to Notion, Readwise & more

AI-powered
podcast player

Listen to all your favourite podcasts with AI-powered features

Discover
highlights

Listen to the best highlights from the podcasts you love and dive into the full episode