You don't need all the permutations. If there are 32 bytes in a cache line then each instruction can only start at one of 32 possible positions. Then if you w

You don't need all the permutations. If there are 32 bytes in a cache line then each instruction can only start at one of 32 possible positions. Then if you want to decode N instructions per cycle you need N 32-to-1 muxes. You can reduce the number of inputs to the later muxes since instructions can't be zero size.