InClassActivity05-sol

# InClassActivity05-sol - 10:03 AM Activity#05(solutions...

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2/3/03 10:03 AM ECSE-2660 Computer Architecture, Networks, & Operating Systems, Spring 2003 Page 1 of 3 Activity #05 (solutions) Activity 5.1 (First hour) Learning to go from MIPS Assembler Pseudo code C Program 1. (25 points) 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 of instructions in the MIPS code. Then, create a corresponding C/C++ program, and infer the program’s behavior from the C program. a0=n begin: addi \$t0, \$zero, 0 t0=0 add \$t1, \$zero, \$a0 t1=n Loop: slt \$t3, \$t1, \$zero bne \$t3, \$zero, finish if(t1 < 0) go to finish add \$t0, \$t0, \$t1 t0 = t0 + t1 addi \$t1, \$t1, -1 t1 = t1 - 1 j loop goto loop finish: add \$t0, \$t0, \$t0 t0 = t0 + t0 add \$t0, \$t0, \$t0 t0 = t0 + t0 addi \$v0, \$t0, 0 v0 = t0 C program: a0 = n; t0 = 0; t1 = n; while (t1 >= 0) { t0 = t0 + t1; t1 = t1 - 1; } t0 = 2*t0; t0 = 2*t0; v0 = t0; This program calculates the sum 4n + … + 12 + 8 + 4

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## This note was uploaded on 04/25/2010 for the course ECSE ecse-2340 taught by Professor Wozny during the Spring '09 term at Rensselaer Polytechnic Institute.

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InClassActivity05-sol - 10:03 AM Activity#05(solutions...

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