arm day1

 

.text
.global _start
_start:
	mov r0,#0x9
	mov r1,#0x15

loop:
	cmp r0,r1
	beq stop
	subhi r0,r0,r1
	subcc r1,r1,r0
	b loop
stop:
	b stop
.end
	
	

 2.用for循环实现1~100之间的和 13BA for(i=1;i<=100;i++) { sum= sum+i; }

.text
.global _start
_start:
	mov r0,#0x1
	bl sum
	b stop
sum:
	cmp r0,#0x64
	movhi pc,lr
	add r1,r1,r0
	add r0,r0,#0x1
	bne sum
	
stop:
	b stop
.end