docs: prebuilt binaries on Linux and WIndows x86_64 are no longer compiled with target-cpu=native

jqnatividad · jqnatividad · commit 5f892a10a11b · 2025-11-11T05:49:39.000-05:00
as there are too many CPU variants for those platforms and it's causing folks to report SIGILL (Illegal Instruction) bug reports

Though we still compile prebuilts with CPU optimization enabled on more homogenous platforms like Apple Silicon, WIndows for ARM, PowerPC and S390x.

[skip ci]
diff --git a/README.md b/README.md
@@ -140,7 +140,7 @@ Full-featured prebuilt [binary variants](#variants) of the latest qsv version fo
 <a target="_blank" href="https://qsv.dathere.com/download/windows-gnu"><img src="https://github.com/user-attachments/assets/771660f3-e898-4ee2-acb5-e5f268434752" width="200" /></a>
 </div>
 
-These prebuilt binaries are also built with CPU optimizations enabled for x86_64 (e.g. [SSE4.2](https://en.wikipedia.org/wiki/SSE4#SSE4.2), [AVX2](https://en.wikipedia.org/wiki/Advanced_Vector_Extensions#Advanced_Vector_Extensions_2), [AVX512](https://en.wikipedia.org/wiki/Advanced_Vector_Extensions#Advanced_Vector_Extensions_512), etc. on Intel and AMD processors) and Apple Silicon processors ([ARM64 SIMD NEON](https://eclecticlight.co/2021/08/06/accelerating-the-m1-mac-an-introduction-to-simd/)) for even more performance gains. This may prevent some older CPUs from running qsv. If so, "portable" binaries (all CPU optimizations disabled) are also included in the release zip archives (qsv with a "p" suffix - e.g. `qsvp`, `qsvplite` `qsvpdp`).
+Prebuilt binaries for Apple Silicon, Windows for ARM, PowerPC and S390x have CPU optimizations enabled ([`target-cpu=native`](https://rust-lang.github.io/packed_simd/perf-guide/target-feature/rustflags.html#target-cpu)) for even more performance gains. This may prevent some older CPUs from running qsv. If so, "portable" binaries (all CPU optimizations disabled) are also included in the release zip archives (qsv with a "p" suffix - e.g. `qsvp`, `qsvplite` `qsvpdp`).
 
 For Windows, an MSI "Easy installer" for the x86_64 MSVC `qsvp` binary is also available. After downloading and installing the Easy installer, launch the Easy installer and click "Install qsv" to download the latest `qsvp` pre-built binary to a folder that is added to your `PATH`. Afterwards qsv should be installed and you may launch a new terminal to use qsv.
 
