macro_rules! s_t_l {
    (i32x4) => { ... };
    (i16x8) => { ... };
    (i8x16) => { ... };
    (u32x4) => { ... };
    (u16x8) => { ... };
    (u8x16) => { ... };
    (f32x4) => { ... };
}
🔬This is a nightly-only experimental API. (stdsimd #48556)
Available on PowerPC or PowerPC-64 only.