Question

How many clock cycles does the following code take

li          $t2, -32

lw        $t1, 0($t5)

div       $t1, $t1, $t2

sw        $t1, 0($t5)

Answer 1

li          $t2, -32

This instruction obtains one clock cycle

lw        $t1, 0($t5)

This too obtains one clock cycle

div       $t1, $t1, $t2

Gets 3 clock cycles; 2-cycles are necessary for fetch and decode and in 3rd cycle value intended is put in register

sw        $t1, 0($t5)

Obtains two clock cycles

Therefore the code obtains only 7 clock cycles in entirety.