Run results for: xoshiro128** various implementations

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 132

Operating system: Android

Device Platform: Mobile

Date tested: 2 months ago

Test name	Executions per second
Xoshiro128StarStar	568327.9 Ops/sec
Xoshiro128StarStar2	919162.4 Ops/sec

Script Preparation code:

class Xoshiro128StarStar {
	constructor(a, b, c, d) {
		this.a = a;
		this.b = b;
		this.c = c;
		this.d = d;
	}

	next() {
		const t = this.b << 9;
		let r = this.b * 5;
		r = ((r << 7) | (r >>> 25)) * 9;

		this.c ^= this.a;
		this.d ^= this.b;
		this.b ^= this.c;
		this.a ^= this.d;
		this.c ^= t;
		this.d = (this.d << 11) | (this.d >>> 21);

		return r >>> 0; // Ensure unsigned integer
	}

}
class Xoshiro128StarStar2 {
	constructor(a, b, c, d) {
		this.a = a;
		this.b = b;
		this.c = c;
		this.d = d;
	}

	next() {
		const s0 = this.a;
		const s1 = this.b;
		const s2 = this.c;
		const s3 = this.d;

		const x = s1 * 5;
		const r = (((x << 7) | (x >>> 25)) * 9) >>> 0;

		const t2 = s2 ^ s0;
		const t3 = s3 ^ s1;

		this.b = s1 ^ t2;
		this.a = s0 ^ t3;
		this.c = t2 ^ (s1 << 9);
		this.d = (t3 << 11) | (t3 >>> 21);

		return r;
	}
}

rngA = new Xoshiro128StarStar(3536, 4678, 2245, 778);
rngB = new Xoshiro128StarStar2(3536, 4678, 2245, 778);

Tests:

Xoshiro128StarStar
for(let i = 0; i < 100; i++) { const z = rngA.next(); }
Xoshiro128StarStar2
for(let i = 0; i < 100; i++) { const z = rngB.next(); }