Question

write a program immediate.asm that adds the number 5 to a constant called first1. Note that this arithmetic must take place in a register.

Save the source file as imm.s

Answer 1

.data
first1 : .word 10 #storing the constant 10 to first1 variable
msg1 : .asciiz "first1 = "
msg2 : .asciiz "\nAfter adding 5 to First1: "

   .text
   .globl main
main:
#copy value in first1 to $t0
lw $t0,first1
#print the string in variable in msg1
li $v0,4 #print string syscall is v0 = 4
la $a0,msg1 #copy address of msg1 to $a0
syscall

#print the value in first1
li $v0,1 #print integer syscall is v0 = 1
move $a0,$t0 #copy value in $t0 to $a0
syscall

#copy value 5 to $t1
li $t1,5
#add $t0 and $t1.Result stores in $t0
add $t0,$t0,$t1
  
#print the string in variable in msg
li $v0,4 #print string syscall is v0 = 4
la $a0,msg2 #copy address of msg2 to $a0
syscall

#print the result after adding 5 to first1
li $v0,1 #print integer syscall is v0 = 1
move $a0,$t0 #copy value in $t0 to $a0
syscall

li $v0,10 #$v0 == 10 terminate the program # 1cycle
syscall #executes the above operation #3 cycles