    1. store_src_rg                   coords = src.rg
    2. init_lane_masks                CondMask = LoopMask = RetMask = true
    3. copy_constant                  $0 = 0x3F800000 (1.0)
    4. swizzle_4                      $0..3 = ($0..3).xxxx
    5. copy_4_slots_unmasked          x = $0..3
    6. store_loop_mask                $0 = LoopMask
    7. label                          label 0x00000001
    8. copy_slot_unmasked             $1 = x(0)
    9. copy_constant                  $2 = 0x3E800000 (0.25)
   10. sub_float                      $1 -= $2
   11. copy_slot_masked               x(0) = Mask($1)
   12. store_condition_mask           $1 = CondMask
   13. copy_slot_unmasked             $2 = x(0)
   14. zero_slot_unmasked             $3 = 0
   15. cmple_float                    $2 = lessThanEqual($2, $3)
   16. merge_condition_mask           CondMask = $1 & $2
   17. branch_if_all_lanes_active     branch_if_all_lanes_active +9 (label 0 at #26)
   18. mask_off_loop_mask             LoopMask &= ~(CondMask & LoopMask & RetMask)
   19. load_condition_mask            CondMask = $1
   20. copy_slot_unmasked             $1 = x(3)
   21. copy_constant                  $2 = 0x3F800000 (1.0)
   22. cmpeq_float                    $1 = equal($1, $2)
   23. merge_loop_mask                LoopMask &= $1
   24. stack_rewind
   25. branch_if_any_lanes_active     branch_if_any_lanes_active -18 (label 1 at #7)
   26. label                          label 0x00000000
   27. load_loop_mask                 LoopMask = $0
   28. store_loop_mask                $0 = LoopMask
   29. label                          label 0x00000003
   30. zero_slot_unmasked             $4 = 0
   31. copy_slot_unmasked             $1 = x(2)
   32. copy_constant                  $2 = 0x3E800000 (0.25)
   33. sub_float                      $1 -= $2
   34. copy_slot_masked               x(2) = Mask($1)
   35. store_condition_mask           $1 = CondMask
   36. copy_slot_unmasked             $2 = x(3)
   37. copy_constant                  $3 = 0x3F800000 (1.0)
   38. cmpeq_float                    $2 = equal($2, $3)
   39. merge_condition_mask           CondMask = $1 & $2
   40. copy_constant                  $5 = 0xFFFFFFFF
   41. copy_slot_masked               $4 = Mask($5)
   42. mask_off_loop_mask             LoopMask &= ~(CondMask & LoopMask & RetMask)
   43. load_condition_mask            CondMask = $1
   44. zero_slot_unmasked             $1 = 0
   45. copy_slot_masked               x(1) = Mask($1)
   46. reenable_loop_mask             LoopMask |= $4
   47. zero_slot_unmasked             $1 = 0
   48. copy_slot_unmasked             $2 = x(2)
   49. cmplt_float                    $1 = lessThan($1, $2)
   50. merge_loop_mask                LoopMask &= $1
   51. stack_rewind
   52. branch_if_any_lanes_active     branch_if_any_lanes_active -23 (label 3 at #29)
   53. label                          label 0x00000002
   54. load_loop_mask                 LoopMask = $0
   55. copy_4_slots_unmasked          $0..3 = x
   56. load_src                       src.rgba = $0..3