bench_jit_missing_params.cjs
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bench_jit_missing_params.cjs
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	const now = () => (typeof performance !== 'undefined' && performance.now ? performance.now() : Date.now());

	function readScale() {
	if (typeof process === 'undefined' \|\| !process \|\| !process.argv) return 1;
	const raw = Number(process.argv[2]);
	return Number.isFinite(raw) && raw > 0 ? raw : 1;
	}

	const SCALE = readScale();
	const REPEATS = 5;

	function bench(name, rounds, fn) {
	fn(Math.max(1, (rounds / 8) \| 0));

	const samples = [];
	let out = 0;
	for (let i = 0; i < REPEATS; i++) {
	const t0 = now();
	out = fn(rounds);
	samples.push(now() - t0);
	}

	let best = samples[0];
	let sum = 0;
	for (let i = 0; i < samples.length; i++) {
	if (samples[i] < best) best = samples[i];
	sum += samples[i];
	}

	const avg = sum / samples.length;
	console.log(`${name}: best ${best.toFixed(2)} ms, avg ${avg.toFixed(2)} ms, out ${out}`);
	return out;
	}

	function hotMissingParamWrite(rounds) {
	function f(val, options) {
	options = options \|\| {};
	if (typeof val === 'number') return options.long ? 2 : 3;
	return 0;
	}

	let sum = 0;
	for (let i = 0; i < rounds; i++) sum += f(i);
	return sum;
	}

	function hotPresentParamWrite(rounds) {
	function f(val, options) {
	options = options \|\| {};
	if (typeof val === 'number') return options.long ? 2 : 3;
	return 0;
	}

	const shared = {};
	let sum = 0;
	for (let i = 0; i < rounds; i++) sum += f(i, shared);
	return sum;
	}

	function hotNoParamWrite(rounds) {
	function f(val, options) {
	if (!options) options = {};
	if (typeof val === 'number') return options.long ? 2 : 3;
	return 0;
	}

	const shared = {};
	let sum = 0;
	for (let i = 0; i < rounds; i++) sum += f(i, shared);
	return sum;
	}

	function hotLocalWrite(rounds) {
	function f(val, options) {
	let opts = options \|\| {};
	if (typeof val === 'number') return opts.long ? 2 : 3;
	return 0;
	}

	let sum = 0;
	for (let i = 0; i < rounds; i++) sum += f(i);
	return sum;
	}

	const rounds = 8_000_000 * SCALE;
	console.log(`jit missing-parameter benchmark (${rounds} rounds)`);
	bench('missing param write', rounds, hotMissingParamWrite);
	bench('present param write', rounds, hotPresentParamWrite);
	bench('no param write', rounds, hotNoParamWrite);
	bench('local alias write', rounds, hotLocalWrite);

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