Computing Machinery I Assignment 6 Solution

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 ______ _____%