8 instructions

store_src_rg                   coords = src.rg
init_lane_masks                CondMask = LoopMask = RetMask = true
copy_constant                  $4 = 0xFFFFFFFF
branch_if_no_active_lanes_eq   branch +3 (label 0 at #7) if no lanes of $4 == 0xFFFFFFFF
copy_4_uniforms                $0..3 = colorGreen
jump                           jump +3 (label 1 at #9)
label                          label 0
copy_4_uniforms                $0..3 = colorRed
label                          label 0x00000001
load_src                       src.rgba = $0..3