Question

5. Consider the following C code: int main() int x = 1; switch (x) case 1: i=1; case 2: i=5; return 0; Based on this code, answer the following: (a) Convert the above C code to MIPS assembly. (b) The condition you are testing is met at Case 1. You do not want the Case 2 to be tested. Add appropriate instructions in MIPS for this implementation. (c) If int x is any integer other than 1 or 2, you want 'i' to be 0. First, add C code that implements this, then add the appropriate instructions in MIPS for this implementation.

Answer 1

Please find the code below::

a)

aCtoMips6.asm li $s0,1 # int x-1 1 beq $s0,1,casel #if x==1 jump to case1 2 beq $s0,2, case2 #if x==2 jump to case2 j exit case1: li $s1,1 #i=1 7 8 jexit case2: 10 li $s1,5 #i=5 11 j exit 12 13 14 exit 15 16. st ,C

li $s0,1 # int x=1
beq $s0,1,case1 #if x==1 , jump to case1
beq $s0,2,case2 #if x==2 , jump to case2
j exit

case1:
li $s1,1 #i=1
j exit

case2:
li $s1,5 #i=5
j exit

exit:

C)

C code:

int main(){

int x=1;
switch(x)

{

case 1 : i=1;
case 2 : i=5;
default : i=0;
}

return 0
}

mips:

0101 Edit Execute aCtoMips6.asm li $s0,1 # int x-1 1 beq $s0,1,casel #if x==1 jump to case1 2 beq $s0,2, case2 #if x==2 jump to case2 default: 4 li $s1,0 #i=0 j еxit 6 7 case1: li $s1,1 #1=1 j еxit 10 11 case2: 12 13 li $s1,5 #i=5 j еxit 14 15 16 exit: 17 18 LC C

li $s0,1 # int x=1
beq $s0,1,case1 #if x==1 , jump to case1
beq $s0,2,case2 #if x==2 , jump to case2
default:
li $s1,0 #i=0
j exit

case1:
li $s1,1 #i=1
j exit

case2:
li $s1,5 #i=5
j exit

exit: