2.1.2.10 Shift operators
The following instructions perform byte-wise shifts of the contents of
`rA' and `rX'.
SLASRASLAXSRAXSLCSRC- Shift rA or rAX left, right, or rAX circularly (see example below)
left or right. M specifies the number of bytes to be shifted.
OPCODE = 6, MOD = 0, 1, 2, 3, 4, 5.
If we begin with, say, `[rA]' = - 01 02 03 04 05, we would
have the following modifications to `rA' contents when performing
the instructions on the left column:
| SLA 2 | [rA] = - 03 04 05 00 00
|
| SLA 6 | [rA] = - 00 00 00 00 00
|
| SRA 1 | [rA] = - 00 01 02 03 04
|
Note that the sign is unaffected by shift operations. On the other
hand, `SLC', `SRC', `SLAX' and `SRAX' treat
`rA' and `rX' as a single 10-bytes register (ignoring again
the signs). For instance, if we begin with `[rA]' = + 01 02 03 04 05 and `[rX]' = - 06 07 08 09 10, we would have:
| SLC 3 | [rA] = + 04 05 06 07 08 | [rX] = - 09 10 01 02 03
|
| SLAX 3 | [rA] = + 04 05 06 07 08 | [rX] = - 09 10 00 00 00
|
| SRC 4 | [rA] = + 07 08 09 10 01 | [rX] = - 02 03 04 05 06
|
| SRAX 4 | [rA] = + 00 00 00 00 01 | [rX] = - 02 03 04 05 06
|