60 lines
2.0 KiB
JavaScript
60 lines
2.0 KiB
JavaScript
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var XoroShiro128Plus = (function () {
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function XoroShiro128Plus(s01, s00, s11, s10) {
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this.s01 = s01;
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this.s00 = s00;
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this.s11 = s11;
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this.s10 = s10;
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}
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XoroShiro128Plus.prototype.clone = function () {
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return new XoroShiro128Plus(this.s01, this.s00, this.s11, this.s10);
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};
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XoroShiro128Plus.prototype.next = function () {
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var nextRng = new XoroShiro128Plus(this.s01, this.s00, this.s11, this.s10);
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var out = nextRng.unsafeNext();
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return [out, nextRng];
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};
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XoroShiro128Plus.prototype.unsafeNext = function () {
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var out = (this.s00 + this.s10) | 0;
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var a0 = this.s10 ^ this.s00;
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var a1 = this.s11 ^ this.s01;
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var s00 = this.s00;
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var s01 = this.s01;
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this.s00 = (s00 << 24) ^ (s01 >>> 8) ^ a0 ^ (a0 << 16);
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this.s01 = (s01 << 24) ^ (s00 >>> 8) ^ a1 ^ ((a1 << 16) | (a0 >>> 16));
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this.s10 = (a1 << 5) ^ (a0 >>> 27);
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this.s11 = (a0 << 5) ^ (a1 >>> 27);
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return out;
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};
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XoroShiro128Plus.prototype.jump = function () {
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var nextRng = new XoroShiro128Plus(this.s01, this.s00, this.s11, this.s10);
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nextRng.unsafeJump();
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return nextRng;
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};
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XoroShiro128Plus.prototype.unsafeJump = function () {
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var ns01 = 0;
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var ns00 = 0;
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var ns11 = 0;
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var ns10 = 0;
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var jump = [0xd8f554a5, 0xdf900294, 0x4b3201fc, 0x170865df];
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for (var i = 0; i !== 4; ++i) {
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for (var mask = 1; mask; mask <<= 1) {
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if (jump[i] & mask) {
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ns01 ^= this.s01;
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ns00 ^= this.s00;
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ns11 ^= this.s11;
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ns10 ^= this.s10;
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}
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this.unsafeNext();
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}
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}
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this.s01 = ns01;
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this.s00 = ns00;
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this.s11 = ns11;
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this.s10 = ns10;
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};
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return XoroShiro128Plus;
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}());
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export var xoroshiro128plus = function (seed) {
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return new XoroShiro128Plus(-1, ~seed, seed | 0, 0);
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};
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