Question

2. Basic arithmetic calculation.
   1. Use instruction “li” to initialize register $t1 with a constant value 10.

li $t1, 10   # [$t1] <- 10

finish the following calculation using MIPS assembly code.

$t2 = $t1 + $t1

$t3 = $t1 << 2 (shift to left by 2 bits)

$t4 = $t1 & 0x0000ffff (bitwise AND)

$t5 = $t1 | 0x0000fffff (bitwise OR)

$t6 = $t2 + $t3 + $t4 + $t5

Write MIPS assembly code to finish the above calculation and print out the result, value of $t6.

Answer 1

Write MIPS assembly language code to perform the following calculation and print the result in $t6:

$t1 = 10

$t2 = $t1 + $t1

$t3 = $t1 << 2 (shift to left by 2 bits)

$t4 = $t1 & 0x0000ffff (bitwise AND)

$t5 = $t1 | 0x0000fffff (bitwise OR)

$t6 = $t2 + $t3 + $t4 + $t5

Answer:

li $t1, 10

add $t2, $t1, $t1

sll $t3, $t1, 2

andi $t4, $t1, 0xFFFF

ori $t5, $t1, 0xFFFF

add $t8, $t2, $t3

add $t9, $t4, $t5

add $t6, $t8, $t9

li $v0, 1

move $a0, $t6

syscall

Description:

Assembly code:

Instruction Description:

li $t1, 10 # load the immediate value 10 in $t1 register.

add $t2, $t1, $t1 # addition of $t1 and $t1 and then store the result in $t2 register.

sll $t3, $t1, 2 # shift left logical $t1 by 2 bits and store the result in $t3 register.

andi $t4, $t1, 0xFFFF # Bitwise and immediate of $t1 and 0xFFFF, store the result in $t4.

ori $t5, $t1, 0xFFFF # Bitwise or immediate of $t1 and 0xFFFF, store the result in $t5.

add $t8, $t2, $t3 #  addition of $t2 and $t3 and then store the result in $t8 register.

add $t9, $t4, $t5 # addition of $t4 and $t5 and then store the result in $t9 register.

add $t6, $t8, $t9 # $t6 = $8 + $t9 = $t2 + $t3 + $t4 + $t5

li $v0, 1 # $v0 = 1 system call means that we want to display or print an integer

move $a0, $t6 # System call will look at $a0 to print the value. (move $t6 to $a0)

syscall