File I/O and Floating-Point Numbers
Write an ARMv8 assembly language program to compute the function ln(x) using the series expansion shown below. Use double precision floating-point numbers. The program will read a series of input values from a file whose name is specified at the command line. The input values will be in binary format; each number will be double precision (and thus each is 8 bytes long). Read from the file using system I/O (i.e. generate an exception using the svc instruction). Process the input values one at a time using a loop (be sure to detect end-of-file correctly), calculate ln(x), and then use printf() to print out the input value and its corresponding output values in table form (i.e. in columns, with column headings) to the screen (standard output). Print out all values with a precision of 10 decimal digits to the right of the decimal point.
You can compute the function ln(x) according to the following series expansion:
where x is a real number input to the function and x 1/2. Continue to accumulate terms in the series until the absolute value of the term is less than 1.0e-13.
Run your program using the input binary file supplied on D2L. Capture its execution using the script UNIX command, and name the output file script.txt.
New Skills need for this Assignment:
Use of system I/O (exceptions) to open and read an input binary file
Understanding and use of floating-point single and double formats
Use of floating-point instructions to do simple calculations
Use of floating-point comparison instructions
Submit the following:
Your assembly source code and script via electronic submission. Use the Assignment 6 Dropbox Folder in D2L to submit electronically. Your TA will assemble and run your program to test it. Name your program a6.asm and the script as script.txt.
Computing Machinery I
Assignment 6 Grading
Student:__________________________________________
Command line arguments 2 ______
Loop to read in data 2 ______
File I/O using exceptions 4 ______
ln(x) routine 6 ______
Screen output using printf() 2 ______
Correct use of floating-point instructions 2 ______
Script showing I/O 2 ______
Complete documentation and commenting 4 ______
Formatting (use of columns and white space) 4 ______
Design quality 2 ______
Total 30 ______ _____%
