The Tor Browser: js/src/jit-test/tests/sunspider/check-access-nbody.js@6474c204b198 (annotated)

js/src/jit-test/tests/sunspider/check-access-nbody.js@6474c204b198 (annotated)

js/src/jit-test/tests/sunspider/check-access-nbody.js

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* The Great Computer Language Shootout
    http://shootout.alioth.debian.org/
    contributed by Isaac Gouy */
 var PI = 3.141592653589793;
 var SOLAR_MASS = 4 * PI * PI;
 var DAYS_PER_YEAR = 365.24;
 function Body(x,y,z,vx,vy,vz,mass){
    this.x = x;
    this.y = y;
    this.z = z;
    this.vx = vx;
    this.vy = vy;
    this.vz = vz;
    this.mass = mass;
 }
 Body.prototype.offsetMomentum = function(px,py,pz) {
    this.vx = -px / SOLAR_MASS;
    this.vy = -py / SOLAR_MASS;
    this.vz = -pz / SOLAR_MASS;
    return this;
 }
 function Jupiter(){
    return new Body(
 .84143144246472090e+00,
       -1.16032004402742839e+00,
       -1.03622044471123109e-01,
 .66007664274403694e-03 * DAYS_PER_YEAR,
 .69901118419740425e-03 * DAYS_PER_YEAR,
       -6.90460016972063023e-05 * DAYS_PER_YEAR,
 .54791938424326609e-04 * SOLAR_MASS
    );
 }
 function Saturn(){
    return new Body(
 .34336671824457987e+00,
 .12479856412430479e+00,
       -4.03523417114321381e-01,
       -2.76742510726862411e-03 * DAYS_PER_YEAR,
 .99852801234917238e-03 * DAYS_PER_YEAR,
 .30417297573763929e-05 * DAYS_PER_YEAR,
 .85885980666130812e-04 * SOLAR_MASS
    );
 }
 function Uranus(){
    return new Body(
 .28943695621391310e+01,
       -1.51111514016986312e+01,
       -2.23307578892655734e-01,
 .96460137564761618e-03 * DAYS_PER_YEAR,
 .37847173959480950e-03 * DAYS_PER_YEAR,
       -2.96589568540237556e-05 * DAYS_PER_YEAR,
 .36624404335156298e-05 * SOLAR_MASS
    );
 }
 function Neptune(){
    return new Body(
 .53796971148509165e+01,
       -2.59193146099879641e+01,
 .79258772950371181e-01,
 .68067772490389322e-03 * DAYS_PER_YEAR,
 .62824170038242295e-03 * DAYS_PER_YEAR,
       -9.51592254519715870e-05 * DAYS_PER_YEAR,
 .15138902046611451e-05 * SOLAR_MASS
    );
 }
 function Sun(){
    return new Body(0.0, 0.0, 0.0, 0.0, 0.0, 0.0, SOLAR_MASS);
 }
 function NBodySystem(bodies){
    this.bodies = bodies;
    var px = 0.0;
    var py = 0.0;
    var pz = 0.0;
    var size = this.bodies.length;
    for (var i=0; i<size; i++){
       var b = this.bodies[i];
       var m = b.mass;
       px += b.vx * m;
       py += b.vy * m;
       pz += b.vz * m;
    }
    this.bodies[0].offsetMomentum(px,py,pz);
 }
 NBodySystem.prototype.advance = function(dt){
    var dx, dy, dz, distance, mag;
    var size = this.bodies.length;
    for (var i=0; i<size; i++) {
       var bodyi = this.bodies[i];
       for (var j=i+1; j<size; j++) {
          var bodyj = this.bodies[j];
          dx = bodyi.x - bodyj.x;
          dy = bodyi.y - bodyj.y;
          dz = bodyi.z - bodyj.z;
          distance = Math.sqrt(dx*dx + dy*dy + dz*dz);
          mag = dt / (distance * distance * distance);
          bodyi.vx -= dx * bodyj.mass * mag;
          bodyi.vy -= dy * bodyj.mass * mag;
          bodyi.vz -= dz * bodyj.mass * mag;
          bodyj.vx += dx * bodyi.mass * mag;
          bodyj.vy += dy * bodyi.mass * mag;
          bodyj.vz += dz * bodyi.mass * mag;
       }
    }
    for (var i=0; i<size; i++) {
       var body = this.bodies[i];
       body.x += dt * body.vx;
       body.y += dt * body.vy;
       body.z += dt * body.vz;
    }
 }
 NBodySystem.prototype.energy = function(){
    var dx, dy, dz, distance;
    var e = 0.0;
    var size = this.bodies.length;
    for (var i=0; i<size; i++) {
       var bodyi = this.bodies[i];
       e += 0.5 * bodyi.mass *
          ( bodyi.vx * bodyi.vx
          + bodyi.vy * bodyi.vy
          + bodyi.vz * bodyi.vz );
       for (var j=i+1; j<size; j++) {
          var bodyj = this.bodies[j];
          dx = bodyi.x - bodyj.x;
          dy = bodyi.y - bodyj.y;
          dz = bodyi.z - bodyj.z;
          distance = Math.sqrt(dx*dx + dy*dy + dz*dz);
          e -= (bodyi.mass * bodyj.mass) / distance;
       }
    }
    return e;
 }
 var ret;
 for ( var n = 3; n <= 24; n *= 2 ) {
     (function(){
         var bodies = new NBodySystem( Array(
            Sun(),Jupiter(),Saturn(),Uranus(),Neptune()
         ));
         var max = n * 100;
         ret = bodies.energy();
         for (var i=0; i<max; i++){
             bodies.advance(0.01);
         }
         ret = bodies.energy();
     })();
 }
 assertEq(ret, -0.16906933525822856)