%Warning-LITENDIAN: t/t_select_bad_msb.v:11: Little bit endian vector: MSB < LSB of bit range: 0:22 reg [0:22] backwd; ^ ... Use "/* verilator lint_off LITENDIAN */" and lint_on around source to disable this message. %Error: t/t_select_bad_msb.v:15: [1:4] Range extract has backward bit ordering, perhaps you wanted [4:1] : ... In instance t sel2 = mi[1:4]; ^ %Error: Exiting due to