This pure javascript code simulates how multiplication is done by mips processors.
Mips multiplication simulator
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>MIPS MULTIPLICATION SIMULATOR </title>
<script type="text/javascript">
/* CREATED BY SERKAN SENDUR */
function StringToNumberArray(Bin) {
var numberArray = [];
for (var i = 0; i < Bin.length; i++) {
numberArray.push(Bin.substring(i, i + 1));
}
return numberArray;
}
function ConvertToDecimal(Bin) {
var decimalNumber = 0;
var numberArray = StringToNumberArray(Bin);
numberArray.reverse();
for (var i = 0; i < numberArray.length; i++) {
decimalNumber += numberArray[i] * Math.pow(2, i);
}
return decimalNumber;
}
function ConvertToBinary(dec) {
var bits = [];
var dividend = dec;
var remainder = 0;
while (dividend >= 2) {
remainder = dividend % 2;
bits.push(remainder);
dividend = (dividend - remainder) / 2;
}
bits.push(dividend);
bits.reverse();
return bits.join("");
}
function Multiply() {
var firstNumber = document.getElementById("txtFirst").value;
var secondNumber = document.getElementById("txtSecond").value;
var multiplier = ConvertToBinary(firstNumber);
var multiplicant = ConvertToBinary(secondNumber);
var product = 0;
var step = "Initial values";
var iteration = 0;
AppendToTable(iteration, step, multiplier, multiplicant, product);
multiplicationAlgoritm(multiplier, multiplicant, product, 4);
}
function multiplicationAlgoritm(multiplier, multiplicant, product, counter) {
if (counter > 0) {
var iteration = 5 - counter;
var decProduct = ConvertToDecimal(product);
var decMultiplier = ConvertToDecimal(multiplier);
var decMultiplicant = ConvertToDecimal(multiplicant);
if (Right(multiplier, 1) == "1") {
decProduct = decProduct + decMultiplicant;
product = ConvertToBinary(decProduct);
AppendToTable(iteration, "1a", multiplier, multiplicant, product);
}
else {
AppendToTable(iteration, 1, multiplier, multiplicant, product);
}
decMultiplicant = ConvertToDecimal(multiplicant);
decMultiplicant = decMultiplicant << 1;
multiplicant = ConvertToBinary(decMultiplicant);
AppendToTable(iteration, 2, multiplier, multiplicant, product);
decMultiplier = ConvertToDecimal(multiplier);
decMultiplier = decMultiplier >> 1;
multiplier = ConvertToBinary(decMultiplier);
AppendToTable(iteration, 3, multiplier, multiplicant, product);
counter--;
multiplicationAlgoritm(multiplier, multiplicant, product, counter);
}
}
function AppendToTable(iteration, step, multiplier, multiplicant, product) {
var row = document.getElementById("tblResults").insertRow();
var cell = row.insertCell();
cell.innerText = iteration;
var cell = row.insertCell();
cell.innerText = step;
var cell = row.insertCell();
cell.innerText = multiplier;
var cell = row.insertCell();
cell.innerText = multiplicant;
var cell = row.insertCell();
cell.innerText = product;
}
function ResetTable() {
for (var i = document.getElementById("tblResults").rows.length; i > 1; i--) {
document.getElementById("tblResults").deleteRow(i - 1);
}
}
function Right(str, n) {
if (n <= 0)
return "";
else if (n > String(str).length)
return str;
else {
var iLen = String(str).length;
return String(str).substring(iLen, iLen - n);
}
}
</script>
<style type="text/css">
.style1
{
border-collapse: collapse;
border-style: solid;
border-width: 1px;
}
.style2
{
width: 6px;
}
.style4
{
color: #3366FF;
}
.style5
{
color: #0066FF;
}
</style>
</head>
<body>
<br />
<h3 class="style4">
WELCOME TO MIPS MULTIPLICATION SIMULATOR</h3>
<hr style="color: #0033CC" />
<table>
<tr>
<td class="style5">
Multiplier :
</td>
<td>
<input id="txtFirst" type="text" />
</td>
</tr>
<tr>
<td class="style5">
Multiplicant :
</td>
<td>
<input id="txtSecond" type="text" />
</td>
</tr>
<tr>
<td align="center" colspan="2">
<input id="btnMultiply" type="button" value="Multiply" onclick="ResetTable();Multiply();"
style="color: #3399FF" />
</td>
</tr>
</table>
<table class="style1" cellpadding="2" cellspacing="2" id="tblResults">
<tr style="color: White">
<td bgcolor="#3366FF">
Iteration
</td>
<td bgcolor="#3366FF">
Step
</td>
<td bgcolor="#3366FF">
Multiplier
</td>
<td bgcolor="#3366FF" class="style2">
Multiplicant
</td>
<td bgcolor="#3366FF">
Product
</td>
</tr>
</table>
</body>
</html>
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