###### tags: `110-2學校上課`
# MIPS
## 基本參數
1. .word = 整數
2. .asciiz,space,ascii = 文字
3. .float = 經度小數
4. .double = 倍經度小數
## 線段數
```mips=
.data
array: .space 404
tree:.space 1616
space:.asciiz "\n"
.text
la $s0,array #$s0 = &array
la $s1,tree #
add $t0,$0,1 # i =0
for1:
beq $t0,101,endfor1
sll $t1,$t0,2 # $t1 = $t0*4
add $t2,$t1,$s0 #$t2 = $t1+$s0
addi $v0,$0,42
addi $a0,$0,0
addi $a1,$0,100
syscall
sb $a0,0($t2)
add $t0,$t0,1 # i ++
j for1
endfor1:
addi $a0,$0,1
addi $a1,$0,1
addi $a2,$0,4
jal build
j endbuild
build:
addi $sp,$sp,-16
sw $a0,($sp)#index
sw $a1,4($sp)#left
sw $a2,8($sp)#right
sw $ra,12($sp)#ra
bne $a1,$a2,process
sll $a0,$a0,2
sll $a1,$a1,2
la $s0,tree
la $s1,array
add $t0,$s0,$a0#tree[index]
add $t1,$s1,$a1#array[left]
lw $t1,($t1)
sw $t1,($t0)
lw $t0,12($sp)
addi $sp,$sp,16
jr $t0
process:
lw $t0,($sp)
lw $t1,4($sp)
lw $t2,8($sp)
add $t3,$t1,$t2#left+right
srl $t3,$t3,1#(left+right)/=2
sll $t0,$t0,1 # index*2
add $a0,$0,$t0
add $a1,$0,$t1
add $a2,$0,$t3
jal build
lw $t0,($sp)
lw $t1,4($sp)
lw $t2,8($sp)
add $t3,$t1,$t2#left+right
srl $t3,$t3,1#(left+right)/=2
addi $t3,$t3,1#(left+right)/=2+1
sll $t0,$t0,1 # index*2
addi $t0,$t0,1 # index*2+1
add $a0,$0,$t0
add $a1,$0,$t3
add $a2,$0,$t2
jal build
lw $t0,0($sp)
lw $t1,4($sp)
lw $t2,8($sp)
la $s0,tree
sll $t3,$t0,3
sll $t4,$t0,3
addi $t4,$t4,4
sll $t5,$t0,2
add $s1,$s0,$t3#tree[2*index]
add $s2,$s0,$t4#tree[2*index+1]
add $s3,$s0,$t5#tree[index]
lw $s1,($s1)
lw $s2,($s2)
add $t0,$s1,$s2
sw $t0,($s3)
lw $t0,12($sp)
addi $sp,$sp,16
jr $t0
endbuild:
la $s1,tree #
add $t0,$0,1 # i =0
for2:
beq $t0,16,Exit
add $v0,$0,1
sll $t1,$t0,2 # $t1 = $t0*4
add $t2,$t1,$s0 #$t2 = $t1+$s0
lw $a0,0($t2)
syscall
add $t0,$t0,1 # i ++
addi $v0, $zero, 4 # print_string syscall
la $a0, space # load address of the string
syscall
j for2
Exit:
```
## Read interger and print
```mips=
.data
istrution:.ascii "Read a interger to print:"
.text
main:
li $v0,4
la $a0,istrution
syscall
li $v0,5
syscall
move $a0,$v0
li $v0,1
syscall
```
## Read float and print
```mips=
.data
istrution:.ascii "Read a float to print:"
.text
main:
li $v0,4
la $a0,istrution
syscall
li $v0,6
syscall
mov.s $f12,$f0
li $v0,2
syscall
```
## Read str and print
```mips=
.data
istrution:.asciiz "Read a string to print:"
buffer: .space 8080
.text
main:
li $v0,4
la $a0,istrution
syscall
li $v0,8
la $a0,buffer
la $a1,100
syscall
li $v0,4
la $a0,buffer
syscall
```
## print ramdom nuber
```mips=
.data
istrution:.ascii "Print a Random(1~100):"
.text
main:
li $v0,4# Load print string service
la $a0,istrution#Load argument
syscall
li $v0,42#Load read interget service
la $a1,100
syscall
move $a0,$v0#move address $v0 to $a0
li $v0,1#Load print interget service
syscall
```
## Input Output Dialog
```mips=
.data
istrution:.ascii "Input output dialog "
str_empty:.asciiz ""
str_buffer:.asciiz ""
str_maxsize:.word 100
.text
main:
li $v0,4# Load print string service
la $a0,istrution#Load argument
syscall
li $v0,54#Load Input Dialog service
la $a0,str_empty
la $a1,str_buffer
lw $a2,str_maxsize
syscall
li $v0,59
la $a0,str_empty
la $a1,str_buffer
syscall
```
## Array 操作
```mips=
.data
array:.space 40 # array is a array divide by 4
.text
li $v0,1
la $t0,array # $t0 = &array
li $s0,10 # $s0=10
sw $s0,0($t0) #$t0 = $s0
lw $a0,($t0)
syscall
```
## IF
```
.text
li $v0 ,1
li $t0,10
li $t1,11
beq $t0,$t1,else
la $a0,100
j exp
else:
la $a0,99
exp:
syscall
```
# print 0~99
```mips=
.text
li $t0,0
Loop:
li $v0,1
move $a0,$t0
syscall
addi $t0,$t0,1
bne $t0,100,Loop
```
## 費式數列
```mips=
.text
main:
addi $a0,$0,12
jal fact
j exit
fact:
addi $sp,$sp,-16
sw $a0,0($sp)
sw $ra,4($sp)
bgt $a0,1,re
add $v0,$a0,$0
lw $t0,4($sp)
addi $sp,$sp,16
jr $t0
re:
lw $t0,($sp)
addi $a0,$t0,-1
jal fact
sw $v0,8($sp)
lw $t0,($sp)
addi $a0,$t0,-2
jal fact
sw $v0,12($sp)
lw $t0,8($sp)
lw $t1,12($sp)
add $v0,$t0,$t1
lw $t0,4($sp)
addi $sp,$sp,16
jr $t0
exit:
add $a0,$0,$v0
addi $v0,$0,1
syscall
```
```mips
addi $a0,$0,1
addi $a1,$0,1
addi $a2,$0,100
j for2
jal build
build:
addi $sp,$sp,-16
bne $a1,$a2,process
addi $sp,$sp,16
sll $a0,$a0,2
sll $a1,$a1,2
la $s0,array
la $s1,tree
add $s0,$s0,$a1#tree[index]
add $s1,$s1,$a0#array[left]
sw $s1,($s0)
lw $t0,12($sp)
jr $t0
process:
sw $a0,($sp)#index
sw $a1,4($sp)#left
sw $a2,8($sp)#right
sw $ra,12($sp)#right
lw $t0,($sp)
lw $t1,4($sp)
lw $t2,8($sp)
add $t3,$t1,$t2#left+right
srl $t3,$t3,1#(left+right)/=2
sll $t0,$t0,1 # index*2
lw $a0,($t0)
lw $a1,($t1)
lw $a2,($t3)
jal build
lw $t0,($sp)
lw $t1,4($sp)
lw $t2,8($sp)
add $t3,$t1,$t2#left+right
srl $t3,$t3,1#(left+right)/=2
addi $t3,$t3,1#(left+right)/=2+1
sll $t0,$t0,1 # index*2
addi $t0,$t0,1 # index*2+1
lw $a0,($t0)
lw $a1,($t3)
lw $a2,($t2)
jal build
lw $t0,0($sp)
lw $t1,4($sp)
lw $t2,8($sp)
la $s0,tree
sll $t3,$t0,2
sll $t4,$t0,2
sll $t5,$t0,2
addi $t4,$t4,1
add $s1,$s0,$t3#tree[2*index]
add $s2,$s0,$t4#tree[2*index+1]
add $s3,$s0,$t5#tree[index]
add $t0,$s1,$s2
sw $t0,($s3)
addi $sp,$sp,16
lw $t0,12($sp)
jr $t0
Exit2:
```
## 考試
### BMI
```mips
.data
input_w :.asciiz "Input Weight"
input_h:.asciiz "Input Height"
.text
main:
addi $v0,$0,4
la $a0,input_w
syscall
addi $v0,$0,6
syscall
mov.s $f3,$f0
addi $v0,$0,4
la $a0,input_h
syscall
addi $v0,$0,6
syscall
mov.s $f4,$f0
mul.s $f4,$f4,$f4
div.s $f12,$f3,$f4
addi $v0,$0,2
syscall
#bmi = weight/height^2
```
## 乘法器
```mips=
.data
A:.word 9487
B:.word 9487
.text
addi $t0,$0,1#i
addi $t1,$0,0#ans
la $t2,A
lw $t2,($t2)
la $t3,B
lw $t3,($t3)
For:
beq $t0,32,EndFor
andi $t4,$t3,1
beq $t4,0,Else
True:
add $t1,$t1,$t2
Else:
addi $t0,$t0,1
srl $t3,$t3,1
sll $t2,$t2,1
j For
EndFor:
li $v0,1
add $a0,$0,$t1
syscall
```
## 除法器
```mips=
.data
A:.word 9487
B:.word 3
.text
addi $t0,$0,1#i
addi $t1,$0,0#ans
la $t2,A
lw $t2,($t2)
la $t3,B
lw $t3,($t3)
la $t7,B
lw $t7,($t7)
Align:
bgt $t3,$t2,End_Align
sll $t3,$t3,1
j Align
End_Align:
srl $t3,$t3,1
For:
beq $t0,32,EndFor
sub $t4,$t2,$t3
blt $t4,0,Else
True:
addi $t1,$t1,1
sub $t2,$t2,$t3
Else:
addi $t0,$t0,1
srl $t3,$t3,1
beq $t2,0,EndFor
blt $t3,$t7,EndFor
sll $t1,$t1,1
j For
EndFor:
li $v0,1
add $a0,$0,$t1
syscall
```
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