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//! Run-time feature detection for ARM on FreeBSD
use super::auxvec;
use crate::detect::{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
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);
}
};
if let Ok(auxv) = auxvec::auxv() {
enable_feature(&mut value, Feature::neon, auxv.hwcap & 0x00001000 != 0);
enable_feature(&mut value, Feature::pmull, auxv.hwcap2 & 0x00000002 != 0);
return value;
}
value
}
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