If we execute the following MIPS code fragments show only th

If we execute the following MIPS code fragments, show only the changes that occur in the register file and memory at the table of \'After Execution\'. Decimal numbers are used for data and addresses 4. add $1, $2, S3 lw $4, 4($1) sub S3, $5, $4 sw $3, 4($2) lw $2, 8(S3) lw S5, 4(S3) J 100 Before Execution Register File Memor data 100 100 $1 $2 S3 $4 S5 addr 100 104 108 112 116 data 100 120 140 160 180 200 260

Solution

Only changes occured in registers and memory are as abelow:
Register File Memory
#   data Addr    data
$1   108(i.e.$1=$2+$3) 100   100
$2   $2=180 104   120
$3   $3=140   ($3=$5-$4) 108   140
   then on execution of sw
   sw $3,4($2)
   $3=mem[$2+4]
   $3=140
$4   120(i.e.$4=mem[$1+4) 112   160
       $4=mem[104]
       $4=120              
$5   160 116   180