Question

1. Translate the following C code to MIPS assembly.

int a = 1;

int b = 2;

if (a<b)

          a=a+1;

b = b + a;

printf("The value of b is: %d", b);

2. Translate the following C code to MIPS assembly.

int a = 2;

int b = 2;

if (a<b)

          a=a+1;

else

          a=a-1;

b = b + a;

printf("The value of b is: %d", b);

Answer 1

Answer:

Note: I am writing the given code in main() function and also included #include <stdio.h> header file for proper compilation.

1)

.LC0:

.ascii "The value of b is: %d\000"

main:

daddiu $sp,$sp,-48

sd $31,40($sp)

sd $fp,32($sp)

sd $28,24($sp)

move $fp,$sp

lui $28,%hi(%neg(%gp_rel(main)))

daddu $28,$28,$25

daddiu $28,$28,%lo(%neg(%gp_rel(main)))

li $2,1 # 0x1

sw $2,0($fp)

li $2,2 # 0x2

sw $2,4($fp)

lw $3,0($fp)

lw $2,4($fp)

slt $2,$3,$2

beq $2,$0,.L2

nop

lw $2,0($fp)

addiu $2,$2,1

sw $2,0($fp)

.L2:

lw $3,4($fp)

lw $2,0($fp)

addu $2,$3,$2

sw $2,4($fp)

lw $2,4($fp)

move $5,$2

ld $2,%got_page(.LC0)($28)

daddiu $4,$2,%got_ofst(.LC0)

ld $2,%call16(printf)($28)

move $25,$2

1: jalr $25

nop

move $2,$0

move $sp,$fp

ld $31,40($sp)

ld $fp,32($sp)

ld $28,24($sp)

daddiu $sp,$sp,48

j $31

nop

2)

.LC0:

.ascii "The value of b is: %d\000"

main:

daddiu $sp,$sp,-48

sd $31,40($sp)

sd $fp,32($sp)

sd $28,24($sp)

move $fp,$sp

lui $28,%hi(%neg(%gp_rel(main)))

daddu $28,$28,$25

daddiu $28,$28,%lo(%neg(%gp_rel(main)))

li $2,2 # 0x2

sw $2,0($fp)

li $2,2 # 0x2

sw $2,4($fp)

lw $3,0($fp)

lw $2,4($fp)

slt $2,$3,$2

beq $2,$0,.L2

nop

lw $2,0($fp)

addiu $2,$2,1

sw $2,0($fp)

b .L3

nop

.L2:

lw $2,0($fp)

addiu $2,$2,-1

sw $2,0($fp)

.L3:

lw $3,4($fp)

lw $2,0($fp)

addu $2,$3,$2

sw $2,4($fp)

lw $2,4($fp)

move $5,$2

ld $2,%got_page(.LC0)($28)

daddiu $4,$2,%got_ofst(.LC0)

ld $2,%call16(printf)($28)

move $25,$2

1: jalr $25

nop

move $2,$0

move $sp,$fp

ld $31,40($sp)

ld $fp,32($sp)

ld $28,24($sp)

daddiu $sp,$sp,48

j $31

nop