Function u16x8_narrow_i32x4

#[target_feature(enable = "simd128")]
pub fn u16x8_narrow_i32x4(a: v128, b: v128) -> v128

Converts two input vectors into a smaller lane vector by narrowing each lane.

Signed saturation to 0x0000 or 0xffff is used and the input lanes are always interpreted as signed integers.