Macro safe_arch::extract_i64_imm_m128i

macro_rules! extract_i64_imm_m128i {
    ($a:expr, $imm:expr) => { ... };
}

Gets the i64 lane requested. Only the lowest bit is considered.

let a = m128i::from([5_i64, 6]);
assert_eq!(extract_i64_imm_m128i!(a, 1), 6_i64);