{"slug": "fearless-simd", "name": "fearless_simd", "category": "dev-libs", "category_name": "Libraries and frameworks", "description": "", "recommenders": 4, "commenters": 4, "warners": 0, "score": 3.871, "rising": 2.67, "first": "2026-07-22", "latest": "2026-09-28", "why": "Fearless SIMD is what finally allowed my FFT crate, PhastFT, to run on stable Rust", "why_is_quote": true, "has_verdict": false, "sentiment": {"recommend": 5, "neutral": 0, "compare": 0, "warn": 0}, "spark": [0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 3, 0], "listed": true, "loved": [], "caveat": "", "short_quote": "Fearless SIMD is what finally allowed my FFT crate, PhastFT, to run on stable Rust", "kind": "", "icon": true, "domain": null, "github_repo": "github.com/linebender/fearless_simd", "official_url": "https://github.com/linebender/fearless_simd", "pricing": "", "aliases": ["fearless_simd", "Fearless SIMD"], "verdict": null, "praise": [{"label": "", "summary": "", "quotes": [{"id": 798103664, "item_id": 49881479, "url": "https://news.ycombinator.com/item?id=49881479", "by": "syncontrol", "date": "2026-09-28", "version": null, "stance": "recommend", "quote": "You are in luck, Fearless SIMD published 1.0 just a few days ago", "excerpt": "You are in luck, Fearless SIMD published 1.0 just a few days ago: https://crates.io/crates/fearless_simd It's the closest thing to Google's Highway. (I am not connected to Fearless SIMD in any way other than as a user.)", "context": "user, not affiliated", "use_case": "SIMD vector library", "switched_from": "", "story": "The state of SIMD in Rust in 2026"}, {"id": 797396561, "item_id": 49837285, "url": "https://news.ycombinator.com/item?id=49837285", "by": "O3marchnative", "date": "2026-09-24", "version": null, "stance": "recommend", "quote": "Fearless SIMD is what finally allowed my FFT crate, PhastFT, to run on stable Rust", "excerpt": "This is quite amazing. Fearless SIMD is what finally allowed my FFT crate, PhastFT, to run on stable Rust [0]. PhastFT previously depended on Rust\u2019s std::simd (as well as multiversion), which still requires nightly [1]. One of the main contributors to v1.0 of fearless_simd started out by helping me evaluate portable SIMD crates for PhastFT. Once we landed on fearless_simd, he ported PhastFT from std::simd to fearless", "context": "", "use_case": "portable SIMD in Rust", "switched_from": "std::simd", "story": "Fearless SIMD v1.0"}, {"id": 797386128, "item_id": 49836633, "url": "https://news.ycombinator.com/item?id=49836633", "by": "Dr_Emann", "date": "2026-09-24", "version": null, "stance": "recommend", "quote": "Have been really happy with Fearless simd", "excerpt": "Have been really happy with Fearless simd, I used it to write [memchr-n][1], which searches for instances of an arbitrary set of bytes, with simd, which actually tends to [outperform][2] the rust memchr crate, even for sets of 1-3 bytes (what's supported by memchr) [1]: https://github.com/Dr-Emann/memchr_n#performance [2]: https://github.com/BurntSushi/memchr/pull/241", "context": "", "use_case": "SIMD byte search", "switched_from": "", "story": "Fearless SIMD v1.0"}, {"id": 787989664, "item_id": 49249354, "url": "https://news.ycombinator.com/item?id=49249354", "by": "O3marchnative", "date": "2026-08-10", "version": null, "stance": "recommend", "quote": "we had to switch to the fearless_simd crate in order to get a portable SIMD solution that works on stable", "excerpt": "The author mentions Rust's portable SIMD library [0]. The only issue with portable SIMD is it's only available on nightly. I used it in my FFT crate, but we had to switch to the fearless_simd crate in order to get a portable SIMD solution that works on stable [1]. [0] https://doc.rust-lang.org/std/simd/index.html [1] https://github.com/linebender/fearless_simd", "context": "", "use_case": "portable SIMD in FFT crate", "switched_from": "std::simd", "story": "Rust SIMD on the GPU"}]}], "caveats": [], "who": [{"by": "syncontrol", "context": "user, not affiliated", "url": "https://news.ycombinator.com/item?id=49881479", "date": "2026-09-28"}], "tags": [], "use_cases": ["simd vector library", "portable simd in rust", "simd byte search", "portable simd in fft crate", "simd in rust"], "compared": [], "makers": [], "threads": [{"url": "https://news.ycombinator.com/item?id=49800085", "title": "Fearless SIMD v1.0", "mentions": 2}, {"url": "https://news.ycombinator.com/item?id=49844629", "title": "The state of SIMD in Rust in 2026", "mentions": 1}, {"url": "https://news.ycombinator.com/item?id=49247477", "title": "Rust SIMD on the GPU", "mentions": 1}, {"url": "https://news.ycombinator.com/item?id=49010648", "title": "Everyone Should Know SIMD", "mentions": 1}], "sentiment_by_month": {"2025-11": {}, "2025-12": {}, "2026-01": {}, "2026-02": {}, "2026-03": {}, "2026-04": {}, "2026-05": {}, "2026-06": {}, "2026-07": {"recommend": 1}, "2026-08": {"recommend": 1}, "2026-09": {"recommend": 3}, "2026-10": {}}, "versions": [], "version_unnamed": 0, "family_ref": null, "runs_on": null, "lines": [], "quotes": [{"id": 798103664, "item_id": 49881479, "url": "https://news.ycombinator.com/item?id=49881479", "by": "syncontrol", "date": "2026-09-28", "version": null, "stance": "recommend", "quote": "You are in luck, Fearless SIMD published 1.0 just a few days ago", "excerpt": "You are in luck, Fearless SIMD published 1.0 just a few days ago: https://crates.io/crates/fearless_simd It's the closest thing to Google's Highway. (I am not connected to Fearless SIMD in any way other than as a user.)", "context": "user, not affiliated", "use_case": "SIMD vector library", "switched_from": "", "story": "The state of SIMD in Rust in 2026"}, {"id": 797396561, "item_id": 49837285, "url": "https://news.ycombinator.com/item?id=49837285", "by": "O3marchnative", "date": "2026-09-24", "version": null, "stance": "recommend", "quote": "Fearless SIMD is what finally allowed my FFT crate, PhastFT, to run on stable Rust", "excerpt": "This is quite amazing. Fearless SIMD is what finally allowed my FFT crate, PhastFT, to run on stable Rust [0]. PhastFT previously depended on Rust\u2019s std::simd (as well as multiversion), which still requires nightly [1]. One of the main contributors to v1.0 of fearless_simd started out by helping me evaluate portable SIMD crates for PhastFT. Once we landed on fearless_simd, he ported PhastFT from std::simd to fearless", "context": "", "use_case": "portable SIMD in Rust", "switched_from": "std::simd", "story": "Fearless SIMD v1.0"}, {"id": 797386128, "item_id": 49836633, "url": "https://news.ycombinator.com/item?id=49836633", "by": "Dr_Emann", "date": "2026-09-24", "version": null, "stance": "recommend", "quote": "Have been really happy with Fearless simd", "excerpt": "Have been really happy with Fearless simd, I used it to write [memchr-n][1], which searches for instances of an arbitrary set of bytes, with simd, which actually tends to [outperform][2] the rust memchr crate, even for sets of 1-3 bytes (what's supported by memchr) [1]: https://github.com/Dr-Emann/memchr_n#performance [2]: https://github.com/BurntSushi/memchr/pull/241", "context": "", "use_case": "SIMD byte search", "switched_from": "", "story": "Fearless SIMD v1.0"}, {"id": 787989664, "item_id": 49249354, "url": "https://news.ycombinator.com/item?id=49249354", "by": "O3marchnative", "date": "2026-08-10", "version": null, "stance": "recommend", "quote": "we had to switch to the fearless_simd crate in order to get a portable SIMD solution that works on stable", "excerpt": "The author mentions Rust's portable SIMD library [0]. The only issue with portable SIMD is it's only available on nightly. I used it in my FFT crate, but we had to switch to the fearless_simd crate in order to get a portable SIMD solution that works on stable [1]. [0] https://doc.rust-lang.org/std/simd/index.html [1] https://github.com/linebender/fearless_simd", "context": "", "use_case": "portable SIMD in FFT crate", "switched_from": "std::simd", "story": "Rust SIMD on the GPU"}, {"id": 784207776, "item_id": 49012986, "url": "https://news.ycombinator.com/item?id=49012986", "by": "arijun", "date": "2026-07-22", "version": null, "stance": "recommend", "quote": "", "excerpt": "> Every developer should\u2026 most importantly, not be scared of SIMD Seems like he should be recommending fearless_simd [1], the Rust crate by Raph Levian and the folks at Linebender :) More seriously, if you\u2019re looking to add SIMD to your Rust code, that\u2019s the package to start with. [1] https://crates.io/crates/fearless_simd", "context": "", "use_case": "SIMD in Rust", "switched_from": "", "story": "Everyone Should Know SIMD"}]}