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bench_bigint.js
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bench_bigint.js
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const now = () => (typeof performance !== 'undefined' && typeof performance.now === 'function' ? performance.now() : Date.now());
if (typeof BigInt !== 'function') {
console.log('BigInt is not available in this runtime.');
} else {
console.log('BigInt Bench (new feature coverage)');
let sinkBig = 0n;
let sinkNum = 0;
const HASH_BIAS = 11400714819323198485n;
const mixBig = x => {
sinkBig ^= x + HASH_BIAS;
};
const mixNum = x => {
sinkNum = (sinkNum * 1664525 + (x >>> 0) + 1013904223) >>> 0;
};
function bench(name, iterations, fn) {
const start = now();
for (let i = 0; i < iterations; i++) fn(i);
const ms = now() - start;
const opsPerSec = ms > 0 ? Math.round((iterations * 1000) / ms) : 0;
console.log(`${name}: ${ms.toFixed(2)}ms (${opsPerSec} ops/s)`);
}
const prefHex = BigInt('0xff');
const prefBin = BigInt('0b1010101010101010');
const prefOct = BigInt('0o777777');
const trimmed = BigInt(' 123456789 ');
const literalSeed = 0xffn + 0b1010n + 0o77n + trimmed;
const a0 = (1n << 260n) + (1n << 129n) + 12345678901234567890123n + literalSeed;
const b0 = (1n << 192n) + (1n << 67n) + 987654321123456789n + prefHex + prefBin;
const c0 = (1n << 73n) + 12345n + prefOct;
bench('parse prefixed strings x120000', 120000, i => {
const v = BigInt('0xff') + BigInt('0b1011') + BigInt('0o77') + BigInt(' 42 ') + BigInt('');
mixBig(v + BigInt(i & 31));
});
bench('prefixed literal arith x180000', 180000, i => {
const v = (0xffn << 12n) + 0b101010n + 0o777n + BigInt(i);
mixBig(v ^ literalSeed);
});
bench('add/sub x300000', 300000, i => {
const ai = a0 + BigInt(i);
const bi = b0 - BigInt(i);
mixBig(ai + bi - c0);
});
bench('mul x70000', 70000, i => {
const x = (a0 + BigInt(i)) * (c0 + BigInt((i & 31) + 1));
mixBig(x >> 11n);
});
bench('div/mod x70000', 70000, i => {
const x = (a0 << 17n) + BigInt(i);
const q = x / c0;
const r = x % c0;
mixBig(q ^ r);
});
bench('shift x250000', 250000, i => {
const s1 = BigInt(i & 63);
const s2 = BigInt((i + 7) & 63);
const x = (a0 << s1) >> s2;
mixBig(x);
});
bench('toString(10) x4000', 4000, i => {
const s = (a0 + BigInt(i)).toString(10);
mixNum(s.length + s.charCodeAt(0));
});
bench('toString(16) x6000', 6000, i => {
const s = (b0 + BigInt(i)).toString(16);
mixNum(s.length + s.charCodeAt(s.length - 1));
});
bench('toString(2) x1200', 1200, i => {
const s = (c0 << BigInt((i & 255) + 128)).toString(2);
mixNum(s.length);
});
bench('asIntN/asUintN x250000', 250000, i => {
const x = a0 + BigInt(i);
const y = BigInt.asIntN(127, x);
const z = BigInt.asUintN(127, -x);
mixBig(y ^ z);
});
console.log('sinkBig:', sinkBig.toString(16));
console.log('sinkNum:', sinkNum);
}

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