MIPS

本文最后更新于 2024年10月6日 晚上

数据声明

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.data 
pi:.double 3.145926
str:.asciiz "hello, world\n"
i:.word 3 
array1:.byte 'a','b'#声明一个存储2个字符的数组
array2:.space 40#声明一个存放40字节的空间

基本运算

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sub	$t2,$t3,$t4	#  $t2 = $t3 - $t4
addi	$t2,$t3, 5	#  $t2 = $t3 + 5;   "add immediate" (no sub immediate)
addu	$t1,$t6,$t7	#  $t1 = $t6 + $t7;   add as unsigned integers
subu	$t1,$t6,$t7	#  $t1 = $t6 + $t7;   subtract as unsigned integers

mult	$t3,$t4		#  multiply 32-bit quantities in $t3 and $t4, and store 64-bit
			#  result in special registers Lo and Hi:  (Hi,Lo) = $t3 * $t4
　　　　　　　　　　　　　　　　　　　　　　　　　# 运算结果存储在hi,lo（hi高位数据， lo地位数据）
div	$t5,$t6		#  Lo = $t5 / $t6   (integer quotient)
			#  Hi = $t5 mod $t6   (remainder)
　　　　　　　　　　　　　　　　　　　　　　　　　# 商数存放在 lo, 余数存放在 hi
mfhi	$t0		#  move quantity in special register Hi to $t0:   $t0 = Hi
				# 不能直接获取 hi 或 lo中的值， 需要mfhi, mflo指令传值给寄存器
mflo	$t1		#  move quantity in special register Lo to $t1:   $t1 = Lo
			#  used to get at result of product or quotient

move	$t2,$t3	#  $t2 = $t3

Syscall

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.data
	myFloat:.float 123.456
	pi:.double 3.1415926
	zeroDouble:.double 0
	enter:.asciiz "\n"
	i:.word 3
.macro ent
	li $v0, 4
	la $a0, enter
	syscall
.end_macro

.macro done
	li $v0, 10
	syscall
.end_macro 

.macro writeInt(%k)
	move $a0, %k
	li $v0, 1
	syscall
.end_macro 

.text
#print integer
li $v0, 1
li $a0, 12
syscall

ent
#print float
li $v0, 2
ldc1 $f12, myFloat
syscall

ent
#print double
li $v0,3
ldc1 $f2, pi
ldc1 $f0, zeroDouble
add.d $f12, $f2, $f0
syscall

ent
#use macro as a write function
li $t0, 4
writeInt($t0)

ent
#read and then print integer
li $v0, 5
syscall
add $a0, $0, $v0
li $v0, 1
syscall	

ent
#read string
li $v0, 8
li $a1, 100
syscall
li $v0, 4
syscall

macro

宏

堆栈

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#放入堆栈
.macro push(%i)
	addi $sp, $sp, -4
	sw %i, 0($sp)
.end_macro
#从堆栈中取出
.macro pop(%i)
	lw %i, 0($sp)
	addi $sp, $sp, 4
.end_macro

for循环(从0到n)

C语言:

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for (int i = 0; i < n; i++){
    // body
}

MIPS

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.macro for_begin(%startLabel, %endLabel, %n)
	li $t7, 0
	%startLabel:
	bge $t7, %n, %endLabel
.end_macro

.macro for_end(%startLabel, %endLabel)
	addi $t7, $t7, 1
	j %startLabel
	%endLabel:
.end_macro

for循环(从low到high)

C

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for (int i = low; i < high; i++){
    // body, 循环high-low次
}

MIPS

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.macro for_begin(%startLabel, %endLabel, %low, %high)
	move $t7, %low
	%startLabel:
	bge $t7, %high, %endLabel
.end_macro

.macro for_end(%startLabel, %endLabel)
	addi $t7, $t7, 1
	j %startLabel
	%endLabel:
.end_macro

while循环(两数比较)

C

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while (num1 < num2){
    // body
}

MIPS

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.macro while_begin(%startLabel, %endLabel, %num1, %num2)
	%startLabel:
	bge %num1, %num2, %endLabel
.end_macro

.macro while_end(%startLabel, %endLabel)
	j %startLabel
	%endLabel:
.end_macro
#CO
MIPS
https://meteor041.git.io/2024/09/23/MIPS/
作者
meteor041
发布于
2024年9月23日
许可协议