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In this Lab you will code 8086 assembler equivalents (Virgo) for common C control flow instructions. This will give you an appreciation for how control flow is implemented in assembly (and machine) language. You will find that it is not quite as simple as it is with a high-level language. See special instructions for submission at the end of this file.This lab contains a BONUS section worth an additional 4 points on your final mark! Here is a list of the C instructions for which you will code assembly language equivalents:
If statementC codeif (condition) {statements}If-Else statementC codeif (condition) {then_statements} else {else_statements}While loopC codewhile (condition) {statements}Do-While loopC codedo {statements} while (condition);For loopC codefor (initialization; condition; increment) {statements}Switch statementC codeswitch (expression) {case val_1:case_1_statementscase val_2:case_2_statementscase val_n:case_n_statementsdefault:default_statements}Normally, C Switch statements have a Break statement at the end of each case. You will also need to implement Break and Continue statements which can be used inside some of these control flow instructions.Break statementsA Break statement can occur inside a C loop or Switch statement. It is implemented as an unconditional branch to a label immediately following the loop or Switch statement.Continue statementsA Continue statement can occur inside a C loop. For While and Do-While loops, it is implemented as an unconditional branch to a label for the condition test of the While or Do-While statement.A Continue statement in a For loop is implemented as an unconditional branch to a label immediately preceding the code to implement the increment statement.
Note that the assembly code you develop for these C-structure equivalents need only be shown as pseudocode; that is, since the actual conditions are not given, neither the test for the condition nor the jump statement for this test can actually be shown. Typically, the test will be some sort of compare (cmp) instruction and the jump will be one of the many jmp variants. It is only necessary to state that a test must be done at a certain point and that a jump relating to that test should then be done at some other point. In the second and third parts of the assignment, you will code and test two of these instructions using actual assembly language.
Coding for the IF statement is given below as an example of the syntax required. Use a similar syntax for the remaining control flow instructions.
If statementC codeif (condition) {statements}Assembler pseudo-codeIF:test conditionjump to Next if falseassembly code for statementsNext:Part A) Write pseudo-code for the remaining five control flow statements given above and for the Break and Continue statements.Part B) Code a Do-While loop for the following C-code example in Virgo assembly language (assumeint's are words of 2 bytes). Place each C-code statement at the appropriate place in your assembly code as a comment:int x = 0;do{x++;if (x == 5) continue;sum += x;} while (x < 10);Bonus) Code a Switch statement for the following C-code example in assembly language (assume int's are words of 2 bytes). Place each C-code statement at the appropriate place in your assembly code as a comment:
int a;int b = 0x12;int c = 0x34;int p = some constant value;switch (p){case 0: a = b + c; break;case 1: a = b - c; break;case 3: a = b; break;case 7: a = c; break;default: a = 0;}
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