code: function rlc (cpu, n) {
      const r = n << 1 | n >> 7;
  
      cpu.f = 0;
      if ((r & 0xff) == 0) cpu.f |= FLAG_Z;
      if ((n & 0x80) != 0) cpu.f |= FLAG_C;
  
      return r;
  }
docs: RLC n
  
  Description
  Rotate n left. Old bit 7 to Carry flag.
  
  Use with:
  n = A, B, C, D, E, H, L, (HL)
  
  Flags affected:
  Z - Set if result is zero.
  N - Reset.
  H - Reset.
  C - Contains old bit 7 data.
  
  Opcodes:
  Instruction    Parameters    Opcode    Cycles
  RLC            A             CB 07     8
  RLC            B             CB 00     8
  RLC            C             CB 01     8
  RLC            D             CB 02     8
  RLC            E             CB 03     8
  RLC            H             CB 04     8
  RLC            L             CB 05     8
  RLC            (HL)          CB 06     16