Macro is_powerpc64_feature_detected

macro_rules! is_powerpc64_feature_detected {
    ("altivec") => { ... };
    ("vsx") => { ... };
    ("power8") => { ... };
    ("power8-altivec") => { ... };
    ("power8-vector") => { ... };
    ("power8-crypto") => { ... };
    ("power9") => { ... };
    ("power9-altivec") => { ... };
    ("power9-vector") => { ... };
    ($t:tt,) => { ... };
    ($t:tt) => { ... };
}

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.