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Rotate                                           Flags:  O D I T S Z A P C
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                                                         ±               ±
 
Syntax:  RCL dest,1
         RCL dest,CL
         RCL dest,number (80186/286/386 Only)
 
  Rotates the bits in the destination operand the number of times
  specified in the source operand.  RCL and ROL rotate the bits left;
  RCR and ROR rotate right.
 
  ROL and ROR rotate the number of bits in the operand. For each
  rotation, the leftmost or rightmost bit is copied to the carry flag as
  well as rotated. RCL and RCR rotate through the carry flag. The
  carry flag becomes an extension of the operand so that a 9-bit rotation
  is done for 8-bit operands, or a 17-bit rotation for 16-bit operands.
 
  On the 8088 and 8086, the source operand can be either CL or 1.  On
  the 80186-80386, the source operand can be CL or an 8-bit constant.
  On the 80186-80386, rotate counts larger than 31 are masked off, but
  on the 8088 and 8086, larger rotate counts are performed despite the
  inefficiency involved.  The overflow flag is only modified by
  single-bit variations of the instruction; for multiple-bit variations
  it is undefined.
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