fn i(x : i32) -> i32 {
  return ~x;
}

fn u(x : u32) -> u32 {
  return ~x;
}

fn vi(x : vec4<i32>) -> vec4<i32> {
  return ~x;
}

fn vu(x : vec4<u32>) -> vec4<u32> {
  return ~x;
}