Assembly-Online

Example Fibonacci Program

MOV R0, #1
MOV R1, #1
fib:
MOV R2, R0
ADD R0, R0, R1
MOV R1, R2
B print
CMP R0, #40
BGT exit
B fib
exit: \

Instruction Set

ADD Rx, Ry, Op - Adds the value of Rx to Ry and stores the result in Rx.
ADDS Rx, Ry, Op - Adds the value of Rx to Ry and stores the result in Rx. Also stores the value in the CPSR (used for conditional branching).
SUB Rx, Ry, Op - Subtracts the value of Ry from Rx and stores the result in Rx.
SUBS Rx, Ry, Op - Subtracts the value of Ry from Rx and stores the result in Rx. Also stores the value in the CPSR
MOV Rx, Op - Stores the value of Op in Rx.
AND Rx, Ry, Op - Ands the value of Rx and Ry and stores the result in Rx.
ANDS Rx, Ry, Op - Ands the value of Rx and Ry and stores the result in Rx. Also stores the value in the CPSR
ORR Rx, Ry, Op - Ors the value of Rx and Ry and stores the result in Rx.
ORRS Rx, Ry, Op - Ors the value of Rx and Ry and stores the result in Rx. Also stores the value in the CPSR
CMP Rx, Ry, Op - Compares the value of Rx and Ry and stores the result in the CPSR.
B Op - Branches to the label Op.
BNE Op - Branches to the label Op if the value in the CPSR is not equal to 0 (2 elements compared are not equal).
BEQ Op - Branches to the label Op if the value in the CPSR is equal to 0 (2 elements compared are equal).
BGT Op - Branches to the label Op if the value in the CPSR is greater than 0 (1st element compared is greater).
BLT Op - Branches to the label Op if the value in the CPSR is less than 0 (1st element compared is less). \