You're right. I don't know why, but I didn't realize that neither method of multiplication required you to use more than 2 registers here. The use of a temporar

You're right. I don't know why, but I didn't realize that neither method of multiplication required you to use more than 2 registers here. The use of a temporary register was probably coincidental. Maybe it wouldn't have used an extra register if it had needed to spill to the stack in order to use one, and instead maybe it would have written one of the alternatives you wrote. Thanks for letting me know.