Question

Write the assembly code that will transform a squared image into a negative print. (HARD-CODED OUTPUT WILL RESULT IN ZERO.)

That is, every pixel whose unsigned value is 0 should change to 255, 1 should change to 254, 2 should change to 253, ... 255 should change to 0.

$a0 contains the address of the input buffer, $a1 contains the address of the output buffer address, and $a2 contains the image dimension. Look at the below image for your reference:

(Note: You can testify the following in MARS; however, we only evaluate the logic of your program.) (YOU CANNOT ASSUME IT'S A 3X3 IMAGE.)

j main .data input_3x3: .byte 0, 1, 2, 127, 128, 129, 253, 254, 255 output_3x3: .space 9 expected_output_3x3: .byte 255, 254, 253, 128, 127, 126, 2, 1, 0 .text

##################### #a0: input buffer address #a1: output buffer address #a2: image dimension (Image will be square sized, i.e. total size = a2*a2) ##################### image_negative: ############## your code begins here #################

############## your code ends here ################## jr $ra #############################

main: la $a0, input_3x3 la $a1, output_3x3 li $a2, 3 jal image_negative

li $t0, 9 la $t1, output_3x3 print_3x3: lbu $a0, ($t1) li $v0, 1 syscall li $v0, 11 li $a0, 32 syscall addi $t0, $t0, -1 addi $t1, $t1, 1 bnez $t0, print_3x3

_end: #end program li $v0, 10 syscall

Answer 1

Please find the answer below.
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Code.asm

a 2*a 2) 9 #a0: input buffer address 10 #al: output buffer address 11 #a2: image dimension (Image will be square sized, i.e. total size 12 ###### ######### 13 image_negative: 14 15 ############## your code begins here ################# 16 mul $50, $a2,$a2 #get number of element in 2d array 17 li $t0,0 #index 18 li $87,255 #load max values 19 loop: 20 mul $t1,$t0,1 #get index of i 21 add $t2,$t1,$al #get value of output_3x3[i] 22 add $t1,$t1,$a #get value of input_3x3[i] 23 lb $t1, ($t1) #get value of array[i] 24 sub $t1,$57,$t1 #get 255 current index 25 sb $t1, ($t2) #store data in out 26 addi $t0,$t0,1 27 blt $t0,$50 loop #Loop for all element 28 ############## your code ends here ###### ####### 29 jr $ra 30 ###### ##### 31 main: 32 la $a0, input_3x3

.data
input_3x3: .byte 0, 1, 2, 127, 128, 129, 253, 254, 255
output_3x3: .space 9
expected_output_3x3: .byte 255, 254, 253, 128, 127, 126, 2, 1, 0
.text
j main

#####################
#a0: input buffer address
#a1: output buffer address
#a2: image dimension (Image will be square sized, i.e. total size = a2*a2)
#####################
image_negative:

############## your code begins here #################
mul $s0,$a2,$a2 #get number of element in 2d array
li $t0,0 #index
li $s7,255 #load max values
loop:
mul $t1,$t0,1 #get index of i
add $t2,$t1,$a1 #get value of output_3x3[i]
add $t1,$t1,$a0 #get value of input_3x3[i]
lb $t1,($t1) #get value of array[i]
sub $t1,$s7,$t1 #get 255 - current index
sb $t1,($t2) #store data in out
addi $t0,$t0,1
blt $t0,$s0 loop #Loop for all element
############## your code ends here ##################
jr $ra
#############################
main:
la $a0, input_3x3
la $a1, output_3x3
li $a2, 3
jal image_negative
li $t0, 9
la $t1, output_3x3
print_3x3:
lbu $a0, ($t1)
li $v0, 1
syscall
li $v0, 11
li $a0, 32
syscall
addi $t0, $t0, -1
addi $t1, $t1, 1
bnez $t0, print_3x3
_end:
#end program
li $v0, 10
syscall

output

Clear 255 254 253 128 127 126 2 1 0 program is finished running