Question

Implement the following command as an assembly language. Z=(V-W)(X+Y) Address : $s1 →80000 V→80004 W→80008 X→80012 Y→80016 Z→80024 Note: Iw the value at each address, sw the result value after performing the operation.

Answer 1

lw $t0, 4($s1) => $t0 <= V (copying value from address 80000+4 = 80004 i.e. V to temporary register t0)

lw $t1, 8($s1) => $t1 <= W (copying value from address 80000+8 = 80008 i.e. W to temporary register t1)

lw $t2, 12($s1) => $t2 <= X (copying value from address 80000+12 = 80012 i.e. X to temporary register t2)

lw $t3, 16($s1) => $t4 <= Y (copying value from address 80000+16 = 80016 i.e. Y to temporary register t3)

sub $t0, $t0, $t1 => $t0 <= V - W (subtracting value of t1 from t0 and storing back result to t0)

add $t2, $t2, $t3 => $t2 <= X + Y (adding value of t2 into t3 and storing back result to t2)

mul $t0, $t0, $t2 => $t0 <= (V - W)(X + Y) (multiplying value of t0 with t2 and storing back result to t0)

sw $t0, 24($s1) => Z <= (V - W)(X + Y)

=> Storing back result to address 80000+24 = 80024 i.e. Z