Rotate vs Shift

[TDarcos]

Folks seem to be asking, "What's _ROL and _ROR?  How are the different from the bit shifting routines for _SHL and _SHR?"

Simple answer:

Shift is like a bulldozer pushing the bits off the edge. The bits are replaced by 0 for non-negative numbers and 1 for negative numbers.

Rotate is like putting the bits on a conveyor belt or a lazy Susan. the bits that roll off come back around.