CS/COE 447: Spring 2010 Lab 5

YOUR NAME:                        

YOUR PARTNER'S NAME:

Each of you should hand in a hardcopy of your own solution.

This lab will give you MIPS programming practice.


1.	# Write MIPS code that clears bits 11 and 13 
	# (makes them 0) in $t0. The code should preserve 
	# the contents of all other bits.
	#
        # Use lui and ori to place the mask into, say, register $t1.  
        # Then use an "and" instruction.
        #
        # Example:  suppose $t0 = 0xFF81EBFF
        # After, it should be FF81C3FF
        # Make sure you understand why!

2.	# Write MIPS code that prints the value for 
	# bits 15, 16, and 17 in $t0.  The code should 
	# print a single integer number that corresponds
	# to the 3 digit binary number in bits 15, 16, 17.
	# For example, if $t0 is 0x20000, the value printed is 4
        #              if $t0 is 0xFFFFFFFF, the value printed is 7
        # The value of $t0 should not be changed.

3. 	# Write MIPS code that sets bits 7 and 9 (makes 
	# them 1) in $t0. The code should preserve the 
	# contents of all other bits. 
	# For example, if $t0 is 0xFF00007F, the new value should be
        # 0xFF0002FF

4.	# Write MIPS code that prints "It is negative" 
	# when the value in register $t1 is less than 0,
	# prints "It is positive", when the value in register $t1 is 
        # positive, and prints "It is 0", when the value is 0.  This
        # question is to give you practice writing an if-then-else
	# statement, and also with carrying out the tests.
   
5.      # Translate the following C code into MIPS.
        # Use the following to set up the variables:
        .data
        a: .word 3
        b: .word 2
        d: .word 4,2,6,4,5,6,7,2,3,4,5,6  
        while (a < 14){
           D[a] = b + a;
           a += 1;
        }