MIPS汇编二进制转10进制

使用MIPS汇编语言输入二进制转化成10进制输出

##############################
# Register Usege in Main:
# $a0 : number
# $t1 : save '\n'
# $t2 : save a char
# $t3 : buffer pointer
# $t4 : save '0'
# $t5 : save '1'
###############################
.data
binbuf:	.space 33
error: 	.asciiz "wrong input"
.text
	li $v0,8
	la $a0,binbuf
	li $a1,33
	syscall
	
	li $a0,0x0a 	 #0x0a = 10 ,means '\n'
	li $v0,11
	syscall
	
	li $t1,0x0a
	li $t4,0x30		#0x30 is '0'
	li $t5,0x31		#0x31 is '1'
	la $t3,binbuf
	move $a0,$0
redo:
	lb $t2,0($t3)
	beq $t2,0x0a,finish	#if $t2 = '\n' or space ,means the end of the string
	beq $t2,$0,finish
	blt $t2,$t4,err		#if $t2 <'0' or > '1' ,the input is invalid
	bgt $t2,$t5,err
	
	addi $t2,$t2,-0x30	#transfer the char to int 
	sll $a0,$a0,1		#$a0 << 1
	add $a0,$a0,$t2
	addi $t3,$t3,1		#binbuf pointer + 1
	j redo
err:
	la $a0,error
	li $v0,4
	syscall
	li $v0,10
	syscall
finish:
	li $v0,1
	syscall
	li $v0,10
	syscall