diff options
Diffstat (limited to 'src/tools/rustfmt/tests/source/cfg_if/detect/os/linux/mips.rs')
-rw-r--r-- | src/tools/rustfmt/tests/source/cfg_if/detect/os/linux/mips.rs | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/tools/rustfmt/tests/source/cfg_if/detect/os/linux/mips.rs b/src/tools/rustfmt/tests/source/cfg_if/detect/os/linux/mips.rs new file mode 100644 index 000000000..c0a5fb2e5 --- /dev/null +++ b/src/tools/rustfmt/tests/source/cfg_if/detect/os/linux/mips.rs @@ -0,0 +1,31 @@ +//! Run-time feature detection for MIPS on Linux. + +use crate::detect::{Feature, cache, bit}; +use super::auxvec; + +/// 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 +} |