EE 361 Homework

Homework 2

Due Date: 9/7 (fri.)

Assignment:

• [2 pt]Textbook problem 2.13.
• [2 pt]Problem A. What are the MIPS assembly language instructions for the following words (see back cover of textbook for instruction format and op codes).

  000000 01101 00000 00000 00000 001000
  000000 00001 00010 00011 00000 100010
  000010 00000 00000 00000 00000 001100
  100011 00011 00100 00000 00000 000100
  

• [2 pts]Problem B. Convert each of the following lines of C language code to MIPS assembly language. Note that two of the six lines are done as examples, so you only need to do the other four. The variables "k" and "j" are stored in registers $3 and $4, respectively. You may use register $2 for temporary storage.
  1. if (k == j) k = 0;

             bne    $3,$4,Skip      #  if (k != j) goto Skip
             add    $3,$0,$0        #  k = 0;
     Skip:
     

  2. if (k != j) k = 0;

  3. if (k > j) k = 0;

             #  if (k <= j) goto Skip
             slt   $2,$4,$3      # if (k > j) then $2 = 1
                                 # Otherwise, "k <= j" and $2 = 0
             beq   $2,$0,Skip    # if (k <= j) goto Skip
             add   $3,$0,$0
     Skip:
     

  4. if (k < j) k = 0;

  5. if (k >= j) k = 0;

  6. if (k <= j) k = 0;

• [2 pt]Textbook problem 3.1.
• [2 pts]Problem C. Implement the following function using MIPS assembly language. Assume the input parameters are passed through register $3, $4, and $5, and the return value is passed through register $2. You may use registers $10-$12 for temporary storage.

  /*  This function checks if 
  int between(int i, int j, int k)
  {
  if (i <= j && j <= k) return 1;
  else return 0;
  }