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I understand the from the terms that RCR would rotate the bit from the right to left, taking the bit from the carry while ROR will rotate the bit from right to left, taking the bit from the right but is that the only difference between them? If this is so, both of the instructions seem to do the same work. Please help out. Thanks
RCR includes the carry flag in the rotation, so it’s effectively an N+1 bit rotate, whereas ROR does not include the carry flag, so it’s just an N bit rotate.
Some nice diagrams from http://www.c-jump.com: