Testing Big Integer performance

package.json

{
  "name": "mathbuffer-test",
  "version": "0.1.0",
  "description": "Testing Big Integer implementation performance",
  "main": "test.js",
  "dependencies": {
    "math-buffer": "~0.1.1",
    "bigi": "~1.1.0"
  },
  "author": "Brooks Boyd <[email protected]>"
}

test.js

'use strict';

var BigMath = require('math-buffer');
var BigInteger = require('bigi');

function fromHex(s) {
  return flipBuf(new Buffer(s, 'hex'));
};
function arrayToHex(a) { return a.map(function(i) { return ('00'+i.toString(16)).slice(-2); }).join(''); };
function LEhex(buf) {
  return flipBuf(buf).toString('hex');
}  
function flipBuf(buf) {
  var out = new Buffer(buf.length);
  for (var i = 0; i < buf.length; i++) {
    out[i] = buf[buf.length-i-1];
  }
  return out;
}
function fromDec(s) {
  var numDigits = s.length;
  var TEN = BigMath.fromInt(10);
  var out = BigMath.fromInt(0);
  for (var i = 0; i < numDigits; i++) {
    var value = parseInt(s[i]);
    var power = numDigits-i-1;
    var num = BigMath.fromInt(value);
    for (var j = 0; j < power; j++) {
      num = BigMath.multiply(num, TEN);
    }
    out = BigMath.add(out, num);
  }
  // Trim off zeroes
  for (var i = out.length; i >= 0; i--) {
    if (out[i] > 0) {
      return out.slice(0, i+1);
    }
  }
  return out.slice(0,1);
}

// Math Buffer testing
var q = fromHex('ffffffffffffffffffffffffffffffff7fffffff');
var a = fromHex('ffffffffffffffffffffffffffffffff7ffffffc');
var x = fromHex('4A96B5688EF57328');

var TEN = new Buffer([10]);
for (var j = 0; j < 10; j++) {
  console.time('buffer-multiply '+j);
  for (var i = 0; i < 10; i++) {
    var y = BigMath.multiply(x, TEN);
    x = y;
  }
  console.timeEnd('buffer-multiply '+j);
}

x = fromHex('4A96B5688EF57328'); // Reset
for (var j = 0; j < 10; j++) {
  console.time('buffer-square '+j);
  for (var i = 0; i < 10; i++) {
    var y = BigMath.square(x);
    //x = y;
  }
  console.timeEnd('buffer-square '+j);
}

x = fromHex('4A96B5688EF57328'); // Reset
for (var j = 0; j < 10; j++) {
  console.time('buffer-mod '+j);
  for (var i = 0; i < 10; i++) {
    var y = BigMath.multiply(x, TEN);
    var z = BigMath.divide(y, q);
    x = y;
  }
  console.timeEnd('buffer-mod '+j);
}

// Bigi testing
var q = new BigInteger('ffffffffffffffffffffffffffffffff7fffffff', 16);
var a = new BigInteger('ffffffffffffffffffffffffffffffff7ffffffc', 16);
var x = new BigInteger('4A96B5688EF57328', 16);
var TEN = new BigInteger('10');
for (var j = 0; j < 10; j++) {
  console.time('bigi-multiply '+j);
  for (var i = 0; i < 10; i++) {
    var y = x.multiply(TEN);
    x = y;
  }
  console.timeEnd('bigi-multiply '+j);
}

x = new BigInteger('4A96B5688EF57328', 16); // Reset
for (var j = 0; j < 10; j++) {
  console.time('bigi-square '+j);
  for (var i = 0; i < 10; i++) {
    var y = x.pow(2);
    //x = y;
  }
  console.timeEnd('bigi-square '+j);
}

x = new BigInteger('4A96B5688EF57328', 16); // Reset
for (var j = 0; j < 10; j++) {
  console.time('bigi-mod '+j);
  for (var i = 0; i < 10; i++) {
    var y = x.multiply(TEN);
    var z = y.remainder(q);
    x = y;
  }
  console.timeEnd('bigi-mod '+j);
}