52 instructions

store_src_rg                   xy = src.rg
init_lane_masks                CondMask = LoopMask = RetMask = true
splat_2_constants              _0_sum, _1_i = 0
label                          label 0x00000001
copy_slot_unmasked             $0 = _0_sum
copy_slot_unmasked             $6 = _1_i
copy_from_indirect_uniform_unm $1 = Indirect(u2(0) + $6)
add_float                      $0 += $1
copy_slot_unmasked             _0_sum = $0
add_imm_int                    _1_i += 0x00000001
copy_slot_unmasked             $0 = _1_i
cmplt_imm_int                  $0 = lessThan($0, 0x00000004)
stack_rewind
branch_if_no_active_lanes_eq   branch -10 (label 1 at #4) if no lanes of $0 == 0
label                          label 0
copy_constant                  _2_prod = 0x3F800000 (1.0)
copy_constant                  _3_i = 0
label                          label 0x00000003
copy_slot_unmasked             $0 = _2_prod
copy_slot_unmasked             $6 = _3_i
cmplt_imm_int                  $6 = lessThan($6, 0x00000002)
copy_slot_unmasked             $7 = _3_i
copy_constant                  $8 = 0
mix_int                        $6 = mix($7, $8, $6)
copy_from_indirect_uniform_unm $1 = Indirect(u3(0) + $6)
mul_float                      $0 *= $1
copy_slot_unmasked             _2_prod = $0
add_imm_int                    _3_i += 0x00000001
copy_slot_unmasked             $0 = _3_i
cmplt_imm_int                  $0 = lessThan($0, 0x00000004)
stack_rewind
branch_if_no_active_lanes_eq   branch -14 (label 3 at #18) if no lanes of $0 == 0
label                          label 0x00000002
copy_uniform                   $0 = u1(0)
copy_slot_unmasked             $1 = _0_sum
copy_slot_unmasked             $2 = _2_prod
store_return_mask              $3 = RetMask
copy_constant                  i = 0x00000007 (9.809089e-45)
store_loop_mask                $4 = LoopMask
jump                           jump +9 (label 7 at #49)
label                          label 0x00000008
copy_slot_unmasked             $6 = i
copy_from_indirect_uniform_unm $5 = Indirect(u4(0) + $6)
copy_slot_masked               [index_clamped_out_of_bounds].result = Mask($5)
mask_off_return_mask           RetMask &= ~(CondMask & LoopMask & RetMask)
copy_slot_unmasked             $5 = i
add_imm_int                    $5 += 0x00000001
copy_slot_masked               i = Mask($5)
label                          label 0x00000007
copy_slot_unmasked             $5 = i
cmplt_imm_int                  $5 = lessThan($5, 0x00000008)
merge_loop_mask                LoopMask &= $5
stack_rewind
branch_if_any_lanes_active     branch_if_any_lanes_active -13 (label 8 at #41)
label                          label 0x00000006
load_loop_mask                 LoopMask = $4
load_return_mask               RetMask = $3
copy_slot_unmasked             $3 = [index_clamped_out_of_bounds].result
label                          label 0x00000005
load_src                       src.rgba = $0..3