    1. store_src_rg                   coords = src.rg
    2. init_lane_masks                CondMask = LoopMask = RetMask = true
    3. copy_constant                  $0 = unknownInput
    4. zero_slot_unmasked             $1 = 0
    5. cmpne_float                    $0 = notEqual($0, $1)
    6. copy_slot_unmasked             b = $0
    7. swizzle_4                      $0..3 = ($0..3).xxxx
    8. copy_4_slots_unmasked          b4 = $0..3
    9. copy_slot_unmasked             $0 = b
   10. copy_slot_unmasked             $1 = $0
   11. zero_slot_unmasked             $2 = 0
   12. copy_constant                  $3 = 0xFFFFFFFF
   13. copy_4_slots_unmasked          b4 = $0..3
   14. zero_slot_unmasked             $0 = 0
   15. copy_slot_unmasked             $1 = b
   16. copy_constant                  $2 = 0xFFFFFFFF
   17. zero_slot_unmasked             $3 = 0
   18. copy_4_slots_unmasked          b4 = $0..3
   19. zero_slot_unmasked             $0 = 0
   20. copy_slot_unmasked             $1 = b
   21. zero_slot_unmasked             $2 = 0
   22. copy_slot_unmasked             $3 = b
   23. copy_4_slots_unmasked          b4 = $0..3
   24. copy_constant                  $4 = 0x3F800000 (1.0)
   25. swizzle_4                      $4..7 = ($4..7).xxxx
   26. bitwise_and_4_ints             $0..3 &= $4..7
   27. copy_4_slots_unmasked          [main].result = $0..3
   28. load_src                       src.rgba = [main].result