T-Head C908:
rgb24_to_y_8_c:            2.0
rgb24_to_y_8_rvv_i32:      2.7
rgb24_to_y_128_c:         26.2
rgb24_to_y_128_rvv_i32:    9.2
rgb24_to_y_1080_c:       219.5
rgb24_to_y_1080_rvv_i32:  76.2
rgb24_to_y_1280_c:       276.2
rgb24_to_y_1280_rvv_i32:  89.7
rgb24_to_y_1920_c:       389.7
rgb24_to_y_1920_rvv_i32: 134.2

SpacemiT X60:
rgb24_to_y_8_c:            1.7
rgb24_to_y_8_rvv_i32:      2.2
rgb24_to_y_128_c:         23.2
rgb24_to_y_128_rvv_i32:    4.2
rgb24_to_y_1080_c:       195.0
rgb24_to_y_1080_rvv_i32:  33.7
rgb24_to_y_1280_c:       231.0
rgb24_to_y_1280_rvv_i32:  40.0
rgb24_to_y_1920_c:       346.2
rgb24_to_y_1920_rvv_i32:  59.7