function ff_h264_h_loop_filter_luma_neon, export=1
h264_loop_filter_start
+ sxtw x1, w1
sub x0, x0, #4
ld1 {v6.8B}, [x0], x1
function ff_h264_v_loop_filter_chroma_neon, export=1
h264_loop_filter_start
+ sxtw x1, w1
sub x0, x0, x1, lsl #1
ld1 {v18.8B}, [x0], x1
function ff_h264_h_loop_filter_chroma_neon, export=1
h264_loop_filter_start
+ sxtw x1, w1
sub x0, x0, #2
ld1 {v18.S}[0], [x0], x1