This will be the second assignment using ARMv7 assembly language in the VisUAL emulator.

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Computer Architecture

This will be the second assignment using ARMv7 assembly language in the VisUAL emulator. The assignment will be similar to one used in the instructor's older  classes. This program is intended to validate a United States Postal Service ZIP code, and to return the state associated with that ZIP code. You will receive an array of DCD statements, starting label Zips, which comprises 61 triplets of integer numbers:The state code

 

• The lowest ZIP code in that state's range

• The highest ZIP code in that state's range

 

(The state code is based upon the old Federal Information Processing Standards (FIPS), which are now part of an ANSI standard.) This triplet corresponds to the following C++ struct:

 

For example, the values for the state of California are:

 

 

The label Z6 is provided because the VisUAL emulator requires one for DCD statements. The state code is 6, the low ZIP code is 90000, and the high ZIP code for California is 96199.

 

Note that some states have more than one ZIP code range associated with them. These labels will have letters appended to the name. The labels have no particular significance for the solution of this problem.

 

You will be given an integer input value containing a ZIP code (the search ZIP code). This ZIP code will be contained in a DCD with the label ThisZip. Your program should do the following: Determine if the ZIP code (ThisZip) is within limits (ZIP > 0 and ZIP < 99999)

• Search the table from beginning to end looking for the state which contains this ZIP code:

o The low ZIP code in the table entry is less than or equal to the search ZIP code.

o The high ZIP code in the table entry is greater than or equal to the search ZIP code.

• When a matching table entry is found, set the following result variables:

o The DCD GoodZip shall be set to 1 if valid if ThisZip is valid and contained in a table entry

o The DCD ThisSt shall be set to the state code from the matching table entry if found

• If no matching table entry is found, set the GoodZip and ThisSt variables to zero.

• The program ends at this point.

 

For grading, the instructor will set various valid, invalid, and missing ZIP codes into the ThisZip variable. Your test data should include:

 

 

• a negative number,

• zero,

• a ZIP code which is within limits but not found in any table entry (such as 333),

• a valid ZIP code (such as 91371, the Pierce College ZIP code), and

• a number greater than 99999 You do not turn in the test data.

The input will be the following variable in your program:

 

The actual number of array entries will be in a variable named maxI. You may use this as a limit in a for loop. The output of your program will be the values placed in the following variables:

• GoodZip : a value of 1 if the ZIP code in ThisZip is valid and found in the table, or 0 if not

• ThisSt: the state code from the matching entry in the table, or zero if the ZIP code did not match any entry Your program must use the variable names ThisZip, GoodZip, and ThisSt.

Your program will be tested with the set of values shown later in this assignment. Copy and paste the Zips table into your program. You may assume that the Zips array will contain the number of entries in the maxI value.

 

Grading

 

The following standard will be used for grading:

 

• Successful assembly and execution with no error messages: 8 points

 

• Correct output values in the GoodZip and ThisSt variables: a total of 32 points allocated among several test cases Your program should include the following line at the begining:

Points will be deducted if this is missing or incorrect. "Last, first" is your name, and "nnnnn" is your section number.

Note On File Type

The VisUAL emulator saves files with an extension of ".s". Please upload your program with that extension, not .cpp, .c, .m, .asm, or any other extension.

 

Attachments:

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