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Activity05 Soln - SOLUTIONS Activity#05 Activity 4.1(First...

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ECSE-2660 Computer Architecture, Networks, & Operating Systems, Spring 2001 Page 1 of 3 SOLUTIONS Activity #05 Activity 4.1 (First hour) Learning to go from MIPS Assembler Pseudo code C Program a. (25 pts) Describe what the following MIPS code returns in the output register $v0. Assume that $a0 is used for the input and initially contains "n", a positive integer. First, start by creating a pseudo-code description, then a C/C++ program, and infer the program’s behavior from the C program. a0=n begin: addi $t0, $zero, 0 t0=0 addi $t1, $zero, 0 t1=0 addi $t2, $zero, 0 t2=0 loop: slt $t3, $a0, $t2 bne $t3, $zero, finish if(a0 < t2 ) go to finish add $t0, $t0, $t1 t0 = t0 + t1 addi $t1, $t1, 1 t1 = t1 + 1 addi $t2, $t2, 1 t2 = t2 +1 j loop goto loop finish: addi $v0, $t0, 0 v0 = t0 C program: A0 = n; T0=t1=t2 = 0; While (a0 !< t2) { T0 = t0 +t1; T1 = t1 +1; T2 = t2+1; } v0 = t0; This program calculates the sum 1 + 2 + ..... n Grading: There are 3 parts to this question: Pseudocode (10 pts), C program (10 pts), final answer (5 pts). For the 5 pt parts, give 2 pts for trying, and 5 for correct answer. For the 10-point parts, point out errors, and deduct one point for
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