diff options
Diffstat (limited to 'src/tools/rustfmt/tests/target/cfg_if/detect/os/linux/powerpc.rs')
-rw-r--r-- | src/tools/rustfmt/tests/target/cfg_if/detect/os/linux/powerpc.rs | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/tools/rustfmt/tests/target/cfg_if/detect/os/linux/powerpc.rs b/src/tools/rustfmt/tests/target/cfg_if/detect/os/linux/powerpc.rs new file mode 100644 index 000000000..dc19bc8ed --- /dev/null +++ b/src/tools/rustfmt/tests/target/cfg_if/detect/os/linux/powerpc.rs @@ -0,0 +1,41 @@ +//! Run-time feature detection for PowerPC on Linux. + +use super::{auxvec, cpuinfo}; +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, 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/cputable.h][cputable] + // + // [cputable]: https://github.com/torvalds/linux/blob/master/arch/powerpc/include/uapi/asm/cputable.h + if let Ok(auxv) = auxvec::auxv() { + // note: the PowerPC values are the mask to do the test (instead of the + // index of the bit to test like in ARM and Aarch64) + enable_feature(&mut value, Feature::altivec, auxv.hwcap & 0x10000000 != 0); + enable_feature(&mut value, Feature::vsx, auxv.hwcap & 0x00000080 != 0); + enable_feature(&mut value, Feature::power8, auxv.hwcap2 & 0x80000000 != 0); + return value; + } + + // PowerPC's /proc/cpuinfo lacks a proper Feature field, + // but `altivec` support is indicated in the `cpu` field. + if let Ok(c) = cpuinfo::CpuInfo::new() { + enable_feature(&mut value, Feature::altivec, c.field("cpu").has("altivec")); + return value; + } + value +} |