you know how the rev A 6502 from 1975 had a bug in ROR? turns out not to be true. https://youtu.be/Uk_QC1eU0Fg
The 6502 Rotate Right Myth

YouTube
@tubetime So how does the Rotate Left instruction work? Does it also have such extensive circuitry to keep the carry?
@rhialto i forgot to mention it in the video, but rotate left is kinda incredible. it just uses the ALU to add the number to itself. carry in, carry out just like a regular add!
@tubetime That is both ingenious and a bit evil at the same time!