Macro is_powerpc_feature_detected 

macro_rules! is_powerpc_feature_detected {
    ("altivec") => { ... };
    ("vsx") => { ... };
    ("power8") => { ... };
    ("power8-altivec") => { ... };
    ("power8-vector") => { ... };
    ("power8-crypto") => { ... };
    ("power9") => { ... };
    ("power9-altivec") => { ... };
    ("power9-vector") => { ... };
    ($t:tt,) => { ... };
    ($t:tt) => { ... };
}

🔬This is a nightly-only experimental API. (stdarch_powerpc_feature_detection #111191)

Check for the presence of a CPU feature at runtime.

When the feature is known to be enabled at compile time (e.g. via -Ctarget-feature) the macro expands to true.