Macro safe_arch::extract_i32_from_m256i

macro_rules! extract_i32_from_m256i {
    ($a:expr, $imm:expr) => { ... };
}

This is supported with target feature avx only.

Extracts an i32 lane from m256i

let a = m256i::from([9, 10, 11, 12, 13, 14, 15, 16]);
assert_eq!(extract_i32_from_m256i!(a, 3), 12);