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//! Run-time feature detection for MIPS on Linux.
use super::auxvec;
use crate::detect::{bit, cache, Feature};
/// Performs run-time feature detection.
#[inline]
pub fn check_for(x: Feature) -> bool {
cache::test(x as u32, detect_features)
}
/// Try to read the features from the auxiliary vector, and if that fails, try
/// to read them from `/proc/cpuinfo`.
fn detect_features() -> cache::Initializer {
let mut value = cache::Initializer::default();
let enable_feature = |value: &mut cache::Initializer, f, enable| {
if enable {
value.set(f as u32);
}
};
// The values are part of the platform-specific [asm/hwcap.h][hwcap]
//
// [hwcap]: https://github.com/torvalds/linux/blob/master/arch/arm64/include/uapi/asm/hwcap.h
if let Ok(auxv) = auxvec::auxv() {
enable_feature(&mut value, Feature::msa, bit::test(auxv.hwcap, 1));
return value;
}
// TODO: fall back via `cpuinfo`.
value
}
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