| 摘要 |
A method to perform a shift-add operation on two values loaded in two memories of a processor where the first memory has a low bit (LB) and a high bit (HB). If the LB is zero, then this is case (1), if the HB is also zero, shifting the first value lower one bit-position and setting the HB to zero, thereby arriving at a new value in the first memory, and alternately if the HB is one, then this is case (2), and proceed shifting the first value lower one bit-position and setting the HB to one, thereby arriving at the new value. However, if the LB is one, then adding the second value to the first value in the first memory and if this does not produce a carry, proceeding as if at case (1) and otherwise proceeding as if at case (2). |
