Macro safe_arch::extract_i16_as_i32_m128i

macro_rules! extract_i16_as_i32_m128i {
    ($a:expr, $imm:expr) => { ... };
}

Gets an i16 value out of an m128i, returns as i32.

The lane to get must be a constant. If you select outside the range 0..8 then the selection is wrapped to be in range (only the lowest 3 bits of the input are used).

let a = m128i::from([0xA_i16, 0xB, 0xC, 0xD, 0, 0, 0, 0]);
//
assert_eq!(extract_i16_as_i32_m128i!(a, 0), 0xA);
assert_eq!(extract_i16_as_i32_m128i!(a, 1), 0xB);
// the lane requested is "wrapped" to be a valid index.
assert_eq!(50 & 0b111, 2);
assert_eq!(extract_i16_as_i32_m128i!(a, 50), 0xC);