1. store_src_rg                   xy = src.rg
    2. init_lane_masks                CondMask = LoopMask = RetMask = true
    3. zero_slot_unmasked             r = 0
    4. copy_constant                  g = 0x3F800000 (1.0)
    5. copy_slot_unmasked             x = r
    6. copy_slot_unmasked             [opt_barrier].result = x
    7. copy_slot_unmasked             $0 = [opt_barrier].result
    8. label                          label 0x00000000
    9. copy_constant                  $1 = 0x3F800000 (1.0)
   10. zero_slot_unmasked             $2 = 0
   11. copy_slot_unmasked             x = g
   12. copy_slot_unmasked             [opt_barrier].result = x
   13. copy_slot_unmasked             $3 = [opt_barrier].result
   14. label                          label 0x00000002
   15. copy_2_slots_unmasked          rg = $2..3
   16. copy_2_slots_unmasked          [compute_ba].result = $2..3
   17. label                          label 0x00000001
   18. copy_4_slots_unmasked          [main].result = $0..3
   19. load_src                       src.rgba = [main].result