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cpufeatures: add iOS support (static ARM64 capabilities only) #435

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May 26, 2021
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cpufeatures: add iOS support (static ARM64 capabilities only) #435

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25 changes: 24 additions & 1 deletion cpufeatures/src/aarch64.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -135,8 +135,31 @@ pub unsafe fn sysctlbyname(name: &[u8]) -> bool {
value != 0
}

// iOS `check!` macro.
//
// Unfortunately iOS does not provide access to the `sysctl(3)` API which means
// we can only return static values for CPU features which can be assumed to
// be present on all Apple ARM64 hardware.
//
// See discussion on this issue for more information:
// <https://github.com/RustCrypto/utils/issues/378>
#[cfg(target_os = "ios")]
#[macro_export]
#[doc(hidden)]
macro_rules! check {
("aes") => {
true
};
("sha2") => {
true
};
("sha3") => {
false
};
}

// On other targets, runtime CPU feature detection is unavailable
#[cfg(not(any(target_os = "linux", target_os = "macos")))]
#[cfg(not(any(target_os = "ios", target_os = "linux", target_os = "macos")))]
#[macro_export]
#[doc(hidden)]
macro_rules! __detect_target_features {
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