CS 218 – Assignment #3

Description

Purpose: Become familiar with the MIPS stack, function calling, and the MIPS standard calling

convention.

Points: 80

√	b[ i ] − a [ i ]

Note, the routine is must call the gnomeSort() function for the diagonals array before returning.

• Write a MIPS assembly language function, gnomeSort(), to sort the volumes into ascending order (small to large). To sort the numbers, use the following Gnome sort² algorithm:

gnomeSort(a[0..size-1]) {

i := 1

j := 2

while (i < size) {

if (a[i-1] >= a[i]) {

i := j

j := j + 1

} else {

swap a[i-1] and a[i]

i := i – 1

if (i = 0) i := 1

}

}

}

You must use the above gnome sort algorithm above (i.e., do not use a different sort). Note, the algorithm assumes array index’s start at 0. As necessary, you can define additional variables. Submissions not based on this algorithm will not be scored.

• Write a void MIPS function, diagonalsStats(), that will find the minimum, maximum, median, and float average of the diagonals array.

• Write a value returning MIPS function, findSum(), to find the sum of an array.

Write a value returning MIPS function, findAverage(), to find the floating point average of an array. The function must call the findSum() function and perform the required type conversions.

• Write a value returning MIPS assembly language function, iSqrt(), to compute the integer square root of an integer. To estimate the square root of a number, set the initial estimate, iSqrtest to the number and use the following algorithm iterated 50 times.

(		iNumber			) + iSqrt est
			iSqrt est
iSqrt est =
				2

• Write a void MIPS function, displayStats(), to print the diagonals array (seven per line) and the statistical information (minimum, maximum, median, and float average). Most of the code is provided, except for the loop to display the diagonals array. Five (5) spaces should be printed before each number and only seven numbers should be printed on each line in the format shown in the example.

Submission:

• All source files must assemble and execute with QtSpim/SPIM MIPS simulator.

• Submit source file

  • Submit a copy of the program source file via the on-line submission

• Once you submit, the system will score the project and provide feedback.

  • If you do not get full score, you can (and should) correct and resubmit.

  • You can re-submit an unlimited number of times before the due date/time.

• Late submissions will be accepted for a period of 24 hours after the due date/time for any given lab. Late submissions will be subject to a ~2% reduction in points per an hour late. If you submit 1 minute – 1 hour late -2%, 1-2 hours late -4%, … , 23-24 hours late -50%. This means after 24 hours late submissions will receive an automatic 0.

Program Header Block

All source files must include your name, section number, assignment, NSHE number, and program description. The required format is as follows:

• Name: <your name>

• NSHE ID: <your id>

• Section: <section>

• Assignment: <assignment number>

• Description: <short description of program goes here>

Scoring Rubric

Scoring will include functionality, code quality, and documentation. Below is a summary of the scoring rubric for this assignment.

Criteria	Weight	Summary
Assemble	–	Failure to assemble will result in a score
		of 0.
Program Header	3%	Must include header block in the
		required format (see above).
General Comments	7%	Must include an appropriate level of
		program documentation.
Program Functionality	90%	Program must meet the functional
(and on-time)		requirements as outlined in the
		assignment. Must be submitted on time
		for full score.

Example Output:

The program must display the results to the console window. The output should look something like the following (with all of the correct answers displayed for all data sets):

MIPS Assignment #3

Trapezoid Diagonals Program

****************************************************************
Trapezoid		Data Set #1
Length:	15
Diagonals		– Values:	154	155	156	158	159
150		154
159		160	161	162	162	162	163
166
Diagonals		– Stats:
min	=	150
max	=	166
med	=	159
float ave = 158.73333740

****************************************************************

Trapezoid Data Set #2

Length: 75

. . . output truncated . . .