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AREA gcd2, CODE, READONLY ; name this block of code
ENTRY ; mark first instruction
; to execute
start
MOV r0, #1 ; Set up parameters
MOV r1, #2
BL gcd ; Call subroutine
SWI 0x11 ; terminate
gcd
CMP r0, r1
SUBGT r0, r0, r1
SUBLT r1, r1, r0
BNE gcd
MOV pc,lr
END ; mark end of file
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