This is on caller-saved and callee-saved registers working with MIPS for a program writen by diffrent programer that aggre on input and return value of procB. replace X, Y, P, and Q with the smallest set of instructions to save/restore values on the stack and update the stack pointer. Assume that procA and procB were written independently by two different programmers who are following the MIPS guidelines for caller-saved and callee-saved registers.

$s0 = ... $s1 = ... $s2 = ... $t0 = ... $t1 = ... $t2 = ... X $a0 = ... $a1 = ... jal procB Y ... = $s1 ... = $t0 ... = $t1 ... = $a0 jr $ra procB: P ... = $a0 ... = $a1 $s2 = ... $t0 = ... Q jr $ra