The Tor Browser / file comparison
comparison: js/src/devtools/jint/sunspider/access-nbody.js
js/src/devtools/jint/sunspider/access-nbody.js
- branch
- TOR_BUG_9701
- changeset 9
- a63d609f5ebe
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| -1:000000000000 | 0:00edc60eecd8 |
|---|---|
| 1 /* The Great Computer Language Shootout | |
| 2 http://shootout.alioth.debian.org/ | |
| 3 contributed by Isaac Gouy */ | |
| 4 | |
| 5 var PI = 3.141592653589793; | |
| 6 var SOLAR_MASS = 4 * PI * PI; | |
| 7 var DAYS_PER_YEAR = 365.24; | |
| 8 | |
| 9 function Body(x,y,z,vx,vy,vz,mass){ | |
| 10 this.x = x; | |
| 11 this.y = y; | |
| 12 this.z = z; | |
| 13 this.vx = vx; | |
| 14 this.vy = vy; | |
| 15 this.vz = vz; | |
| 16 this.mass = mass; | |
| 17 } | |
| 18 | |
| 19 Body.prototype.offsetMomentum = function(px,py,pz) { | |
| 20 this.vx = -px / SOLAR_MASS; | |
| 21 this.vy = -py / SOLAR_MASS; | |
| 22 this.vz = -pz / SOLAR_MASS; | |
| 23 return this; | |
| 24 } | |
| 25 | |
| 26 function Jupiter(){ | |
| 27 return new Body( | |
| 28 4.84143144246472090e+00, | |
| 29 -1.16032004402742839e+00, | |
| 30 -1.03622044471123109e-01, | |
| 31 1.66007664274403694e-03 * DAYS_PER_YEAR, | |
| 32 7.69901118419740425e-03 * DAYS_PER_YEAR, | |
| 33 -6.90460016972063023e-05 * DAYS_PER_YEAR, | |
| 34 9.54791938424326609e-04 * SOLAR_MASS | |
| 35 ); | |
| 36 } | |
| 37 | |
| 38 function Saturn(){ | |
| 39 return new Body( | |
| 40 8.34336671824457987e+00, | |
| 41 4.12479856412430479e+00, | |
| 42 -4.03523417114321381e-01, | |
| 43 -2.76742510726862411e-03 * DAYS_PER_YEAR, | |
| 44 4.99852801234917238e-03 * DAYS_PER_YEAR, | |
| 45 2.30417297573763929e-05 * DAYS_PER_YEAR, | |
| 46 2.85885980666130812e-04 * SOLAR_MASS | |
| 47 ); | |
| 48 } | |
| 49 | |
| 50 function Uranus(){ | |
| 51 return new Body( | |
| 52 1.28943695621391310e+01, | |
| 53 -1.51111514016986312e+01, | |
| 54 -2.23307578892655734e-01, | |
| 55 2.96460137564761618e-03 * DAYS_PER_YEAR, | |
| 56 2.37847173959480950e-03 * DAYS_PER_YEAR, | |
| 57 -2.96589568540237556e-05 * DAYS_PER_YEAR, | |
| 58 4.36624404335156298e-05 * SOLAR_MASS | |
| 59 ); | |
| 60 } | |
| 61 | |
| 62 function Neptune(){ | |
| 63 return new Body( | |
| 64 1.53796971148509165e+01, | |
| 65 -2.59193146099879641e+01, | |
| 66 1.79258772950371181e-01, | |
| 67 2.68067772490389322e-03 * DAYS_PER_YEAR, | |
| 68 1.62824170038242295e-03 * DAYS_PER_YEAR, | |
| 69 -9.51592254519715870e-05 * DAYS_PER_YEAR, | |
| 70 5.15138902046611451e-05 * SOLAR_MASS | |
| 71 ); | |
| 72 } | |
| 73 | |
| 74 function Sun(){ | |
| 75 return new Body(0.0, 0.0, 0.0, 0.0, 0.0, 0.0, SOLAR_MASS); | |
| 76 } | |
| 77 | |
| 78 | |
| 79 function NBodySystem(bodies){ | |
| 80 this.bodies = bodies; | |
| 81 var px = 0.0; | |
| 82 var py = 0.0; | |
| 83 var pz = 0.0; | |
| 84 var size = this.bodies.length; | |
| 85 /* BEGIN LOOP */ | |
| 86 for (var i=0; i<size; i++){ | |
| 87 var b = this.bodies[i]; | |
| 88 var m = b.mass; | |
| 89 px += b.vx * m; | |
| 90 py += b.vy * m; | |
| 91 pz += b.vz * m; | |
| 92 } | |
| 93 /* END LOOP */ | |
| 94 this.bodies[0].offsetMomentum(px,py,pz); | |
| 95 } | |
| 96 | |
| 97 NBodySystem.prototype.advance = function(dt){ | |
| 98 var dx, dy, dz, distance, mag; | |
| 99 var size = this.bodies.length; | |
| 100 | |
| 101 /* BEGIN LOOP */ | |
| 102 for (var i=0; i<size; i++) { | |
| 103 var bodyi = this.bodies[i]; | |
| 104 /* BEGIN LOOP */ | |
| 105 for (var j=i+1; j<size; j++) { | |
| 106 var bodyj = this.bodies[j]; | |
| 107 dx = bodyi.x - bodyj.x; | |
| 108 dy = bodyi.y - bodyj.y; | |
| 109 dz = bodyi.z - bodyj.z; | |
| 110 | |
| 111 distance = Math.sqrt(dx*dx + dy*dy + dz*dz); | |
| 112 mag = dt / (distance * distance * distance); | |
| 113 | |
| 114 bodyi.vx -= dx * bodyj.mass * mag; | |
| 115 bodyi.vy -= dy * bodyj.mass * mag; | |
| 116 bodyi.vz -= dz * bodyj.mass * mag; | |
| 117 | |
| 118 bodyj.vx += dx * bodyi.mass * mag; | |
| 119 bodyj.vy += dy * bodyi.mass * mag; | |
| 120 bodyj.vz += dz * bodyi.mass * mag; | |
| 121 } | |
| 122 /* END LOOP */ | |
| 123 } | |
| 124 /* END LOOP */ | |
| 125 | |
| 126 /* BEGIN LOOP */ | |
| 127 for (var i=0; i<size; i++) { | |
| 128 var body = this.bodies[i]; | |
| 129 body.x += dt * body.vx; | |
| 130 body.y += dt * body.vy; | |
| 131 body.z += dt * body.vz; | |
| 132 } | |
| 133 /* END LOOP */ | |
| 134 } | |
| 135 | |
| 136 NBodySystem.prototype.energy = function(){ | |
| 137 var dx, dy, dz, distance; | |
| 138 var e = 0.0; | |
| 139 var size = this.bodies.length; | |
| 140 | |
| 141 /* BEGIN LOOP */ | |
| 142 for (var i=0; i<size; i++) { | |
| 143 var bodyi = this.bodies[i]; | |
| 144 | |
| 145 e += 0.5 * bodyi.mass * | |
| 146 ( bodyi.vx * bodyi.vx | |
| 147 + bodyi.vy * bodyi.vy | |
| 148 + bodyi.vz * bodyi.vz ); | |
| 149 | |
| 150 /* BEGIN LOOP */ | |
| 151 for (var j=i+1; j<size; j++) { | |
| 152 var bodyj = this.bodies[j]; | |
| 153 dx = bodyi.x - bodyj.x; | |
| 154 dy = bodyi.y - bodyj.y; | |
| 155 dz = bodyi.z - bodyj.z; | |
| 156 | |
| 157 distance = Math.sqrt(dx*dx + dy*dy + dz*dz); | |
| 158 e -= (bodyi.mass * bodyj.mass) / distance; | |
| 159 } | |
| 160 /* END LOOP */ | |
| 161 } | |
| 162 /* END LOOP */ | |
| 163 return e; | |
| 164 } | |
| 165 | |
| 166 var ret; | |
| 167 | |
| 168 /* BEGIN LOOP */ | |
| 169 for ( var n = 3; n <= 24; n *= 2 ) { | |
| 170 (function(){ | |
| 171 var bodies = new NBodySystem( Array( | |
| 172 Sun(),Jupiter(),Saturn(),Uranus(),Neptune() | |
| 173 )); | |
| 174 var max = n * 100; | |
| 175 | |
| 176 ret = bodies.energy(); | |
| 177 /* BEGIN LOOP */ | |
| 178 for (var i=0; i<max; i++){ | |
| 179 bodies.advance(0.01); | |
| 180 } | |
| 181 /* END LOOP */ | |
| 182 ret = bodies.energy(); | |
| 183 })(); | |
| 184 } | |
| 185 /* END LOOP */ |
