COMP 3050 Computer Architecture
Homework #1/2 Summer, 2021
• This assignment is due no later than midnight (11:59:59 PM) May 26.
• Your submission must be made electronically using the submit command as described below.
• File 1: A short write-up that first specifies what you think your degree of success with a
project is (from 0% to 100%), followed by a brief discussion of your approach to the project
along with a detailed description of any problems that you were not able to resolve for this
project. Failure to specifically provide this information will result in a 0 grade on your
assignment. If you do not disclose problems in your write-up and problems are detected
when your program is tested, you will receive a grade of 0. Make sure that you include
your email address in your write-up so that the corrector can email you your grade.
• File(s) 2(a, b, c, …): Your complete source code, in one or more .c and/or .h files
• File 3: A make file to build your assignment. This file must be named Makefile. You should
be familiar with makefiles from the prerequisite courses. If you are not, google it. The first
few hits will be tutorials, including those at Colby.edu and pitt.edu.
• File 4: A file that includes your resulting output run(s) from your project. This is a simple
text file that shows your output, but make sure that you annotate it so that it is self-descriptive
and that all detailed output is well identified.
• The files described above should be the only files placed in one of your subdirectories, and this
subdirectory should be the target of your submit command (see the on-line file
Assignment_Submit_Details.pdf for specific directions).
• This problem requires you to add two positive only IEEE floating point numbers together by
emulating the floating point hardware in software:
- You are only allowed to use the integer operations in C (i.e. shift, integer add, bitwise logical
operators, etc.) to do the addition. - You will need to scan in two floating point numbers into unions which allows access to the
mantissa, exponent and sign components as shown in class. - Using the bit field components of the two numbers you must compute the result of their addition
and rebuild a new floating point number which you can printf as output. As shown below, you must
include printed bit output which shows the steps you’re using to complete the addition.
• Your program interface must look like what follows between the two lines of asterisks. (What is
below that second line of them are descriptive hints for you.)
This program will emulate the addition of two IEEE 754 floating point numbers
Please enter two positive floating point values each with: - no more than 6 significant digits
- a value between + 1037 and 10-37
Enter Float 1: 34.5
Enter Float 2: 1.250
Original pattern of Float 1: 0 1000 0100 000 1010 0000 0000 0000 0000
Original pattern of Float 2: 0 0111 1111 010 0000 0000 0000 0000 0000
Bit pattern of result : 0 1000 0100 000 1111 0000 0000 0000 0000
EMULATED FLOATING RESULT FROM PRINTF ==>>> 35.75
HARDWARE FLOATING RESULT FROM PRINTF ==>>> 35.75
To get the result of the addition constructed into the union for the example
shown above you must:
-COPY THE MASNTISSA PARTS INTO THEIR OWN HELPER INT VARIABLES AND
-EXPOSE HIDDEN BITS INTO MANTISSA HELPER VARIABLES TO GET 24 BITS:
Slam hidden bit into Float 1: 1000 1010 0000 0000 0000 0000
Slam hidden bit into Float 2: 1010 0000 0000 0000 0000 0000
-SHIFT MANTISSA OF SMALER VALUE FOR COMMON EXPONENT:
Post shift pattern of mant. 1: 1000 1010 0000 0000 0000 0000
Post shift pattern of mant. 2: 0000 0101 0000 0000 0000 0000
-ADD AND ADJUST FINAL MANTISSA OF RESULT:
Bit sums before adjustment: 1000 1111 0000 0000 0000 0000
-SINCE HIDDEN BIT IS PERFECT FOR RESULT JUST REMOVE IT
Final 23 bit pattern for result: 000 1111 0000 0000 0000 0000
-NOW PUT RESULT INTO THE MANTISSA BIT PART OF THE FINAL ANSWER
-WITH COMMON EXPONENT AND CORRECT SIGN PLACED IN THEIR BIT FIELDS
AND PRINT THE UNIT AS A FLOAT
• You must generate output for at least the numbers that are found in this file on Blackboard:
COMP3050_Assignment2_testdata.txt