I was trying to multiply three numbers in assembly language with c++. Can someon
ID: 3862982 • Letter: I
Question
I was trying to multiply three numbers in assembly language with c++. Can someone check and let me know what I am doing wrong and how I can do to improve this code?
.global main
.func main
main:
PUSH {LR}
LDR R0, value1
BL printf
SUB SP, SP, #4
LDR R0, =scanformat
MOV R1, SP
BL scanf
LDR R4, [SP]
LDR R0, value2
BL printf
SUB SP, SP, #4
LDR R0, =scanformat
MOV R1, SP
BL scanf
LDR R5, [SP]
LDR R0, value3
BL printf
SUB SP, SP, #4
LDR R0, =scanformat
MOV R1, SP
BL scanf
LDR R6, [SP]
MOV R0, R4
MOV R1, R5
MOV R2, R6
BL printf
MUL R7, R4, R5
MUL R7, R7, R6
LDR R0, =product
MOV R1, R4
MOV R2, R5
MOV R3, R6
MOV R4, R7
BL printf
ADD SP, SP, #4
POP {PC}
_exit:
MOV PC, LR
value1: .word first
value2: .word second
value3: .word third
.data
string:
product: .asciz "The product of %d,%d, and %d is %d "
first: .asciz "Enter First Number: "
second: .asciz "Enter Second Number: "
third: .asciz "Enter Third Number: "
scanformat: .asciz "%d"
Explanation / Answer
.global main
.func main
main:
PUSH {LR}
LDR R0, value1
BL printf
SUB SP, SP, #4
LDR R0, =scanformat
MOV R1, SP
BL scanf
LDR R4, [SP]
LDR R0, value2
BL printf
SUB SP, SP, #4
LDR R0, =scanformat
MOV R1, SP
BL scanf
LDR R5, [SP]
LDR R0, value3
BL printf
SUB SP, SP, #4
LDR R0, =scanformat
MOV R1, SP
BL scanf
LDR R6, [SP]
MOV R0, R4
MOV R1, R5
MOV R2, R6
BL printf
MUL R7, R4, R5
MUL R7, R7, R6
LDR R0, =product
MOV R1, R4
MOV R2, R5
MOV R3, R6
MOV R4, R7
BL printf
ADD SP, SP, #4
POP {PC}
_exit:
MOV PC, LR
value1: .word first
value2: .word second
value3: .word third
.data
string:
product: .asciz "The product of %d,%d, and %d is %d "
first: .asciz "Enter First Number: "
second: .asciz "Enter Second Number: "
third: .asciz "Enter Third Number: "
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