29 instructions

store_src_rg                   coords = src.rg
init_lane_masks                CondMask = LoopMask = RetMask = true
splat_4_constants              color = 0
copy_uniform                   $0 = colorWhite(0)
cmpeq_imm_float                $0 = equal($0, 0x3F800000 (1.0))
branch_if_no_active_lanes_eq   branch +2 (label 0 at #8) if no lanes of $0 == 0xFFFFFFFF
copy_constant                  color(1) = 0x3F800000 (1.0)
label                          label 0
copy_uniform                   $0 = colorWhite(0)
cmpeq_imm_float                $0 = equal($0, 0x40000000 (2.0))
branch_if_no_active_lanes_eq   branch +2 (label 2 at #13) if no lanes of $0 == 0xFFFFFFFF
jump                           jump +3 (label 3 at #15)
label                          label 0x00000002
copy_constant                  color(3) = 0x3F800000 (1.0)
label                          label 0x00000003
store_loop_mask                $0 = LoopMask
jump                           jump +2 (label 5 at #19)
label                          label 0x00000006
label                          label 0x00000005
copy_uniform                   $1 = colorWhite(0)
cmpeq_imm_float                $1 = equal($1, 0x40000000 (2.0))
merge_loop_mask                LoopMask &= $1
stack_rewind
branch_if_any_lanes_active     branch_if_any_lanes_active -6 (label 6 at #18)
label                          label 0x00000004
load_loop_mask                 LoopMask = $0
store_loop_mask                $0 = LoopMask
label                          label 0x00000008
copy_uniform                   $1 = colorWhite(0)
cmpeq_imm_float                $1 = equal($1, 0x40000000 (2.0))
merge_loop_mask                LoopMask &= $1
stack_rewind
branch_if_any_lanes_active     branch_if_any_lanes_active -5 (label 8 at #28)
label                          label 0x00000007
load_loop_mask                 LoopMask = $0
copy_4_slots_unmasked          $0..3 = color
load_src                       src.rgba = $0..3