From: "Gary Weinhold" <[email protected]> Sent: Tuesday, August 11, 2020 7:49 AM
it may go back to the idea that SR might require an extra step to set/propagate the sign while SLR wouldn't.
Subtraction requires that the second operand is complemented, unity is added, and the operands are summed. The sign is not "propagated"; there is no special work required to produce the most-significant bit of the result. The only difference between SR and SLR is in the setting of the condition code.
But I don't know if that actually ever made a timing difference on any machine.
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