Mine

bit* monomeLeds = new bit[256] //256 bits
bit** transform90 = { 0xf0000000000000000, 0xf00000000000000, ... } //256 arrays of 256 bits

bit* transform90(bit* monomeMap) {

  bit* monomeMapTransformed = new bit[256]

  for(int i=0: i<256: i++) {
    *bit next = monomeMapTransformed+i
    *next = *monomeMap & *(transform90+i) //logical & over 256 bits
  }

  return monomeMapTransformed 
}