Shift operators

The following instructions perform byte-wise shifts of the contents of rA and rX.

SLA

SRA

SLAX

SRAX

SLC

SRC

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