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Why is calling my asm function from Rust slower than calling it from C?

Tea and Bits · published 27 December 2025

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Making the rav1d Video Decoder 1% Faster Read at the source ↗

ohadravid.github.io

https://en.wikipedia.org/wiki/Five_whys

en.wikipedia.org

https://github.com/memorysafety/rav1d/pull/1418

github.com

https://www.reddit.com/r/rust/comments/1pwzti4/why_is_calling_my_asm_function_from_rust_slower/

reddit.com

https://lobste.rs/s/byxxmk/why_is_calling_my_asm_function_from_rust

lobste.rs

https://news.ycombinator.com/item?id=46401982

news.ycombinator.com

https://developer.arm.com/documentation/ddi0602/2025-09/SIMD-FP-Instructions/LD1--single-structure---Load-one-single-element-structure-to-one-lane-of-one-register-?lang=en

developer.arm.com

https://www.1password.community/discussions/developers/1password-chrome-extension-is-incorrectly-manipulating--blocks/165639

1password.community

https://github.com/rust-lang/rust/issues/116963

github.com

https://github.com/memorysafety/rav1d/blob/25e5574/src/cdef.rs

github.com