    1. store_src_rg                   coords = src.rg
    2. init_lane_masks                CondMask = LoopMask = RetMask = true
    3. zero_2_slots_unmasked          x, y = 0
    4. copy_constant                  $0 = 0x3F800000 (1.0)
    5. copy_slot_unmasked             y = $0
    6. copy_slot_unmasked             x = $0
    7. zero_3_slots_unmasked          a, b, c = 0
    8. zero_slot_unmasked             $0 = 0
    9. copy_slot_unmasked             c = $0
   10. copy_slot_unmasked             b = $0
   11. copy_slot_unmasked             a = $0
   12. copy_slot_unmasked             $1 = b
   13. mul_float                      $0 *= $1
   14. copy_slot_unmasked             $1 = x
   15. copy_slot_unmasked             $2 = c
   16. copy_slot_unmasked             $3 = y
   17. load_src                       src.rgba = $0..3