1. store_src_rg                   p = src.rg
    2. init_lane_masks                CondMask = LoopMask = RetMask = true
    3. store_dst                      $0..3 = dst.rgba
    4. copy_2_slots_unmasked          $4..5 = p
    5. swizzle_2                      $4..5 = ($4..5).yx
    6. load_src_rg                    src.rg = $4..5
    7. invoke_shader                  invoke_shader 0x00000000
    8. load_dst                       dst.rgba = $0..3
    9. store_src                      $0..3 = src.rgba
   10. copy_4_slots_unmasked          [main].result = $0..3
   11. load_src                       src.rgba = [main].result