1. Left offset operation SHL/SHLD

1.1. Instruction Description

The instruction shifts the value of the input register (S) by N bits to the left and loads the result into the output register (D). The shift instruction adds 0 to each shifted bit. If the number of shifts (N) is greater than or equal to 16 (SHLD instruction is 32), the value can be shifted up to 16 times (SHLD instruction is 32). If the number of shifts is greater than 0, the value of the last shift will be copied to the shift instruction overflow flag (M8166). If the result of the shift operation is 0, set the zero flag (M8167) of the shift instruction to 0.

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 word Instruction(SHL)

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(SHLD)

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

SHL D0 K1 D1 // Shift D0 left by 1 bit and output to D1

NETWORK 001

LD X001

SHLD D2 K16 D4 // Shift (D2, D3) by 16 bits to the left and output it to (D4, D5). In reality, D4=D3, D5=0.

图1 SHL