! / 0 0 0 0 8 ` // 72 ` cpufeatures-26ba7571a322b621.cpufeatures.fa01787cfb686f3b-cgu.0.rcgu.o/ lib.rmeta/ 0 0 0 644 44304 ` ELF>░╚@@GNUюrust L╘#rustc 1.98.1 (48a229cea 2026-09-01)аШйфмRLЯ.ЕSшAЗwjL-df1bddb45adbe94bа╠Р┴<Е%Z┴>╦64┤кV`-2d2ab9fb0fe1def5а┼├<аІ├╪░Е\≤ІЕэЦЦ $▄Ц $│Шш__unless_target_featuresа__detect_target_featuresа__xgetbvа__expand_check_macroа≤ checkаШЮдИЪд⌠ ·DМ≤ мо(ё Э▀ЬК$Э&К$# [RustCrypto]: CPU Feature Detection [![crate][crate-image]][crate-link] [![Docs][docs-image]][docs-link] [![Build Status][build-image]][build-link] ![Apache2/MIT licensed][license-image] ![Rust Version][rustc-image] [![Project Chat][chat-image]][chat-link] Lightweight and efficient runtime CPU feature detection for `aarch64`, `loongarch64`, and `x86`/`x86_64` targets. Supports `no_std` as well as mobile targets including iOS and Android, providing an alternative to the `std`-dependent `is_x86_feature_detected!` macro. This crate is intended as a stopgap until Rust [RFC 2725] adding first-class target feature detection macros to `libcore` is implemented. ## Example ```rust #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] pub mod x86_backend { // This macro creates `cpuid_aes_sha` module cpufeatures::new!(cpuid_aes_sha, "aes", "sha"); pub fn run() { // `token` is a Zero Sized Type (ZST) value, which guarantees // that underlying static storage got properly initialized, // which allows to omit initialization branch let token: cpuid_aes_sha::InitToken = cpuid_aes_sha::init(); if token.get() { println!("CPU supports both SHA and AES extensions"); } else { println!("SHA and AES extensions are not supported"); } // If stored value needed only once you can get stored value // omitting the token let val = cpuid_aes_sha::get(); assert_eq!(val, token.get()); // Additionally you can get both token and value let (token, val) = cpuid_aes_sha::init_get(); assert_eq!(val, token.get()); } } ``` Note that if all tested target features are enabled via compiler options (e.g. by using `RUSTFLAGS`), the `get` method will always return `true` and `init` will not use CPUID instruction. Such behavior allows compiler to completely eliminate fallback code. After first call macro caches result and returns it in subsequent calls, thus runtime overhead for them is minimal. ## Supported target architectures *NOTE: target features with an asterisk are unstable (nightly-only) and subject to change to match upstream name changes in the Rust standard library.* ### `aarch64` Linux, iOS, and macOS/ARM only (ARM64 does not support OS-independent feature detection) Target features: - `aes`* - `sha2`* - `sha3`* ### `loongarch64` Linux only (`loongarch64` does not support OS-independent feature detection) Target features: - `32s`* - `f`* - `d`* - `frecipe`* - `div32`* - `lsx`* - `lasx`* - `lam-bh`* - `lamcas`* - `ld-seq-sa`* - `scq`* - `lbt`* - `lvz`* - `ual`* ### `x86`/`x86_64` OS independent and `no_std`-friendly Target features: - `adx` - `aes` - `avx` - `avx2` - `avx512bw`* - `avx512cd`* - `avx512dq`* - `avx512er`* - `avx512f`* - `avx512ifma`* - `avx512pf`* - `avx512vl`* - `avx512vbmi`* - `avx512vbmi2`* - `bmi1` - `bmi2` - `fma` - `mmx` - `pclmulqdq` - `popcnt` - `rdrand` - `rdseed` - `sgx` - `sha` - `sse` - `sse2` - `sse3` - `sse4.1` - `sse4.2` - `ssse3` - `sha512` - `sm3` - `sm4` If you would like detection support for a target feature which is not on this list, please [open a GitHub issue][github-issue]. ## License Licensed under either of: * [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0) * [MIT license](http://opensource.org/licenses/MIT) at your option. ### Contribution Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions. [//]: # (badges) [crate-image]: https://img.shields.io/crates/v/cpufeatures.svg [crate-link]: https://crates.io/crates/cpufeatures [docs-image]: https://docs.rs/cpufeatures/badge.svg [docs-link]: https://docs.rs/cpufeatures/ [license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg [rustc-image]: https://img.shields.io/badge/rustc-1.85+-blue.svg [chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg [chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/260052-utils [build-image]: https://github.com/RustCrypto/utils/actions/workflows/cpufeatures.yml/badge.svg?branch=master [build-link]: https://github.com/RustCrypto/utils/actions/workflows/cpufeatures.yml?query=branch:master [//]: # (general links) [RustCrypto]: https://github.com/RustCrypto [RustCrypto/utils#378]: https://github.com/RustCrypto/utils/issues/378 [RFC 2725]: https://github.com/rust-lang/rfcs/pull/2725 [github-issue]: https://github.com/RustCrypto/utils/issues/new?title=cpufeatures:%20requesting%20support%20for%20CHANGEME%20target%20feature аЭ2дDhttps://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svgа└ к(l>Ш[ЮkЪz·┴≤ ≤ої [[[<ЯЦ $╟4╞▄іІш°бІэЄвЭа-Э╦8УЭэ%Э╗MJ Evaluate the given `$body` expression any of the supplied target featuresаЭЖ,) are not enabled. 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code.а)|╟≤я┼вЗ,ь8mod_nameаDы&А8щ,Б$Г,ИЙЯ,К8Я-Л&Н8ЩО$РС,УЖЬ$В-Ы*ЭЪ┤8┴,█8ыSD▌≈│F8#╔8Ш$╘'ґ8╠$╞'Ё8┐4╣'╩Ґы8AtomicU8аDЎ$ф8╡Dх'п8о<р%з8,И8UNINITа4О&У8≥ВЗ8≥Э'Ч8MAXа─%┐84▒8STORAGEа<≤&÷8ВUD║╙8ВUD╛'Є8≤ І╧ю8©V4╨%а< Initialization tokenадп+УЖ▒ 8и4ВЩ░ 8o$Ч$┌ 8e,└ $┴ 8q,▀ 8÷ 84ё 8 InitTokenаL╙ Ё І Є ╣ %Ї 8$ф 8▌YLк у ≤<4 Initialize token, performing CPU feature detection.аЭГ 78╞ 8Ё 8initа$І ╨ ╩ (Ґ 8$ю е Р 8╨Z$ш ъ Ю <M Initialize token and return a `bool` indicating if the feature is supported.аЭ┘P8Ф8Й8init_getаDМУЖ(ЬШ├8$Э$─8б$┌┬╧8З[D·ії< Get initialized value.атл+ВЬ┤ 8Ч4ЫЪ├ 8╦4─ 8≥ 8² 8getа═ ё ╘ є 8$╔ (╚ 8б$ў Ё ┼,и 8,й 'о 8Юдя И К Ь,┘├┼,┤8Я-┬$▀▄*▌▒Б8 W<╞ І8с$Ї╩ц8о<╪е7Тх<+ Get stored value and initialization token,аЭї.<+ initializing underlying storage if needed.аЭБ.+²·╔8Ч4÷8Ё8Ї8З[D╨бц(ехь8▌YLи$р8б$тз┐8Л8resаПТ,Ж8,В'Э8ЮдЧ √≤н,ў╞Ё,╟8Я-╠$Є╣*Ї╨╪+туз8ї$ж8Т8 init_innerаTВ│┌(└8б$┤▄ь8╙8Рaў╡,Є8,╣'╨8Ъд╪ туч,жвш,ь8Я-ы$эщ%ъ8 W<Щ └8▒,┘┼²8Рa▀8▐8≥▓$■8о<√%·8Рa╪8р8▌жз8 W<э 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