1. Loop left offset ROL/ROLD

1.1. Instruction Description

The instruction moves the input word (S) value by N bits in a loop to the left and loads the result into the output word (D). If the number of shifts (N) is greater than or equal to 16 (ROLD is 32), a modulo operation of modulus 16 (ROLD is 32) will be performed before executing the cyclic shift, resulting in an effective number of shifts (N), so that the number of shifts is between 0 and 15 (ROLD is between 0 and 31). If the number of shifts is greater than 0, the cyclic shift instruction is executed, and the last shifted value is copied to the shift instruction overflow flag (M8166). If the number of shifts is 0, the cyclic shift instruction is not executed, and the shift instruction zero flag (M8167) is set to 0.

When using signed data types, the sign bits are also shifted.

Related registers	Description
M8166	The last bit to be removed.
M8167	The result of the shift operation is 0.

1.2. The valid operands of the instruction

1.2.1. Single Character Instruction (ROL)

Input/Output	Data Type	operand	Description
IN1	16 bit unsigned integer	D/CV/TV/AI/AO/K/H/V/Z/FD, bit composite word (X/Y/M/C/T/S), local variable (LW)	Input
IN2	16 bit unsigned integer	D/CV/TV/AI/AO/K/H/V/Z/FD, bit composite word (X/Y/M/C/T/S), local variable (LW)	shift
OUT	16 bit integer	D/CV/TV/AO/V/Z, bit composite word (Y/M/C/T/S), local variable (LW)	output

1.2.2. Double word instruction(ROLD)

Input/Output	Data Type	operand	Description
IN1	32-bit unsigned integer	D/CV/K/H/FD, bit composite word (X/Y/M/C/T/S), local variable (LD)	input
IN2	32-bit unsigned integer	D/CV/K/H/FD, bit composite word (X/Y/M/C/T/S), local variable (LD)	shift
OUT	32-bit integer	D/CV, bit composite word (Y/M/C/T/S), local variable (LD)	output

1.3. Example

Command table

NETWORK 000

LD X000

ROL D0 K1 D1 // Move D0 cycle left by 1 bit and output to D1

NETWORK 001

LD X001

ROLD D2 K16 D4 // Cycle (D2, D3) to the left by 16 bits and output it to (D4, D5). In reality, D4=D3, D5=D2

图1 ROL