macro_rules! t_t_l {
    (i32) => { ... };
    (i16) => { ... };
    (i8) => { ... };
    (u32) => { ... };
    (u16) => { ... };
    (u8) => { ... };
    (f32) => { ... };
}
🔬This is a nightly-only experimental API. (stdsimd #48556)
Available on PowerPC or PowerPC-64 only.