Diffusion Ant (type-hints-typescript) Code

ant/tests/bench_property_hotspots.js
899dad6b8a9etype-hints-typescript

bench_property_hotspots.js
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			function nowMs() {
			if (typeof performance !== 'undefined' && performance && typeof performance.now === 'function') {
			return performance.now();
			}
			return Date.now();
			}

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

			function percentile(sorted, p) {
			if (sorted.length === 0) return 0;
			if (sorted.length === 1) return sorted[0];
			const pos = (sorted.length - 1) * p;
			const base = Math.floor(pos);
			const frac = pos - base;
			const next = sorted[base + 1];
			if (next === undefined) return sorted[base];
			return sorted[base] + (next - sorted[base]) * frac;
			}

			function stableNumericSort(values) {
			const out = values.slice();
			for (let i = 1; i < out.length; i++) {
			const x = out[i];
			let j = i - 1;
			while (j >= 0 && out[j] > x) {
			out[j + 1] = out[j];
			j--;
			}
			out[j + 1] = x;
			}
			return out;
			}

			const SCALE = parseScale();
			const BENCH_WARMUP_RUNS = 2;
			const BENCH_SAMPLE_RUNS = 7;
			let benchSink = 0;

			function scaledIters(base) {
			return Math.max(1, Math.floor(base * SCALE));
			}

			function section(title) {
			console.log('\n=== ' + title + ' ===');
			}

			function bench(label, fn, iters) {
			const warmupIters = Math.max(1, Math.min(iters, Math.max(10_000, (iters / 4) \| 0)));
			for (let i = 0; i < BENCH_WARMUP_RUNS; i++) benchSink ^= fn(warmupIters) \| 0;

			let result = 0;
			const samples = [];
			for (let i = 0; i < BENCH_SAMPLE_RUNS; i++) {
			const t0 = nowMs();
			const r = fn(iters);
			const dt = nowMs() - t0;
			if (i === 0) result = r;
			samples.push(dt);
			}

			const sorted = stableNumericSort(samples);
			const min = sorted[0];
			const med = percentile(sorted, 0.5);
			const p95 = percentile(sorted, 0.95);
			const max = sorted[sorted.length - 1];
			const opsPerMs = med > 0 ? (iters / med).toFixed(2) : 'inf';

			benchSink ^= result \| 0;
			console.log(
			label +
			': median ' + med.toFixed(2) + 'ms (' + opsPerMs + ' ops/ms)' +
			', p95 ' + p95.toFixed(2) + 'ms' +
			', min ' + min.toFixed(2) + 'ms' +
			', max ' + max.toFixed(2) + 'ms' +
			' result=' + result
			);
			}

			function benchCfuncProtoCallApply(n) {
			const fn = parseInt;
			let sum = 0;
			for (let i = 0; i < n; i++) {
			if (fn.call) sum++;
			if (fn.apply) sum++;
			}
			return sum;
			}

			function benchCfuncProtoBind(n) {
			const fn = parseInt;
			let sum = 0;
			for (let i = 0; i < n; i++) {
			if (fn.bind) sum++;
			}
			return sum;
			}

			const DATA_DESC = {
			value: 1,
			writable: true,
			enumerable: true,
			configurable: true,
			};

			function benchDefinePropertyFresh(n) {
			let sum = 0;
			for (let i = 0; i < n; i++) {
			const obj = {};
			Object.defineProperty(obj, 'x', DATA_DESC);
			sum += obj.x;
			}
			return sum;
			}

			const ACCESSOR_DESC = {
			get() { return 1; },
			set(v) { benchSink ^= v \| 0; },
			enumerable: true,
			configurable: true,
			};

			function benchDefineAccessorFresh(n) {
			let sum = 0;
			for (let i = 0; i < n; i++) {
			const obj = {};
			Object.defineProperty(obj, 'x', ACCESSOR_DESC);
			sum += obj.x;
			}
			return sum;
			}

			function benchWithGet(n) {
			const scopeObj = { x: 1 };
			let sum = 0;
			with (scopeObj) {
			for (let i = 0; i < n; i++) sum += x;
			}
			return sum;
			}

			function makeReusableRangeIterable(limit) {
			return {
			[Symbol.iterator]() {
			let i = 0;
			const result = { done: false, value: 0 };
			return {
			next() {
			if (i < limit) {
			result.done = false;
			result.value = i++;
			} else {
			result.done = true;
			result.value = undefined;
			}
			return result;
			}
			};
			}
			};
			}

			function benchForOfReusableResult(n) {
			let sum = 0;
			for (const v of makeReusableRangeIterable(n)) sum += v;
			return sum;
			}

			function benchArrayLiteralCreate(n) {
			let sum = 0;
			for (let i = 0; i < n; i++) {
			const arr = [];
			sum += arr.length;
			}
			return sum;
			}

			function benchObjectLiteralCreate(n) {
			let sum = 0;
			for (let i = 0; i < n; i++) {
			const obj = {};
			if (obj) sum++;
			}
			return sum;
			}

			function benchStringProtoDotRead(n) {
			const str = ' hello ';
			let sum = 0;
			for (let i = 0; i < n; i++) {
			if (str.trim) sum++;
			if (str.toUpperCase) sum++;
			}
			return sum;
			}

			function benchNumberProtoDotRead(n) {
			const num = 123.456;
			let sum = 0;
			for (let i = 0; i < n; i++) {
			if (num.toFixed) sum++;
			if (num.toString) sum++;
			}
			return sum;
			}

			function benchComputedMissingShortKey(n) {
			const obj = {};
			const key = 'missing';
			let sum = 0;
			for (let i = 0; i < n; i++) {
			if (obj[key] === undefined) sum++;
			}
			return sum;
			}

			function benchComputedMissingLongKey(n) {
			const obj = {};
			const key = 'missing_property_name_that_is_long_enough_to_force_a_heap_alloc_in_sv_getprop_fallback_len_0123456789';
			let sum = 0;
			for (let i = 0; i < n; i++) {
			if (obj[key] === undefined) sum++;
			}
			return sum;
			}

			console.log('property hotspot benchmark');
			console.log('scale=' + SCALE);

			section('1. lkp_proto T_CFUNC branch re-interns');
			console.log('sanity parseInt.call=' + (typeof parseInt.call));
			bench('cfunc_proto_call_apply', benchCfuncProtoCallApply, scaledIters(2_000_000));
			bench('cfunc_proto_bind', benchCfuncProtoBind, scaledIters(1_500_000));

			section('2. ensure_string_shape_slot miss path');
			console.log('sanity defineProperty=' + (typeof Object.defineProperty));
			bench('defineProperty_fresh_data', benchDefinePropertyFresh, scaledIters(300_000));
			bench('defineProperty_fresh_accessor', benchDefineAccessorFresh, scaledIters(200_000));

			section('3. with lookup existence-check plus re-fetch');
			console.log('sanity with=' + benchWithGet(3));
			bench('with_get_var', benchWithGet, scaledIters(1_500_000));

			section('4. iterator done/value generic reads');
			console.log('sanity for_of=' + benchForOfReusableResult(8));
			bench('for_of_reusable_result', benchForOfReusableResult, scaledIters(600_000));

			section('5. ctor.prototype lookup on allocation');
			console.log('sanity literals=' + (benchArrayLiteralCreate(3) + benchObjectLiteralCreate(3)));
			bench('array_literal_create', benchArrayLiteralCreate, scaledIters(2_000_000));
			bench('object_literal_create', benchObjectLiteralCreate, scaledIters(2_000_000));

			section('6. primitive proto reads through generic path');
			console.log('sanity primitive=' + (benchStringProtoDotRead(2) + benchNumberProtoDotRead(2)));
			bench('string_proto_dot_read', benchStringProtoDotRead, scaledIters(2_000_000));
			bench('number_proto_dot_read', benchNumberProtoDotRead, scaledIters(2_000_000));

			section('7. computed missing-key reads through sv_getprop_fallback_len');
			console.log('sanity computed=' + (benchComputedMissingShortKey(2) + benchComputedMissingLongKey(2)));
			bench('computed_missing_short_key', benchComputedMissingShortKey, scaledIters(2_000_000));
			bench('computed_missing_long_key', benchComputedMissingLongKey, scaledIters(1_000_000));

			console.log('\nbenchSink=' + benchSink);

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