Question

Assume that $s1 = 0x87654321. Determine the content of registers $s2 to $s4 after executing

the following instructions:

sll $s2,$s1, 16 # $s2 =

srl $s3,$s1, 8 # $s3 =

sra $s4,$s1, 12 # $s4 =

Write a mips assembly language program to execute these instructions and verify the content of registers $s2 to $s4.

Answer 1

1)

sll $s2, $s1, 16 => $s2 = $s1 << 16 => $s2 = 0x87654321 << 16 => $s2 = 0x4321

srl $s3, $s1, 8 => $s2 = $s1 >> 8 => $s2 = 0x87654321 >> 8 => $s2 = 0x00876543

sra $s4, $s1, 12 => $s2 = $s1 >> 12 => $s2 = 0x87654321 >> 12 => $s2 = 0xFFF87654

2)

MIPS PROGRAM :-

.data

.text

.globl main

main:

sll $s2, $s1, 16

addi $v0, $0, 1

add $a0, $0, $s2 #printing $s2

syscall

srl $s3, $s1, 8

addi $v0, $0, 1

add $a0, $0, $s3 #printing $s3

syscall

sra $s4, $s1, 12

addi $v0, $0, 1

add $a0, $0, $s4 #printing $s4

syscall

#system exit

addi $v0, $0, 10

syscall