Question

What are the machine codes for the following MIPS assembly codes?

               a. sub   $t0, $s0, $s1

               b. lw       $t0, 20($s0)

Answer 1

a) For above compiled MIPS C code will be as follows

• a = b - c;
• a will be stored in $t0, b in $s0, c in $s1

Compiled MIPS code is

• sub $t0, $s0, $s1
• where the result of substration is stored in $t0

b) C code for above MIPS code is

• a = A[5];
• index 5 requires offset of 20 the value of A[5] will be loaded in variable a.