Diffusion Ant (type-hints-typescript) Code

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

bench_const_eq.js
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			// Benchmark: constant eq/seq inline — measures overhead of calling
			// jit_helper_eq/jit_helper_seq when one operand is a compile-time
			// constant (true, false, undefined, null) vs. an inline beq/bne.

			function bench(name, fn, iterations) {
			const start = Date.now();
			fn(iterations);
			const elapsed = Date.now() - start;
			console.log(name + ": " + elapsed + "ms (" + iterations + " iters, " + (elapsed / iterations * 1000).toFixed(2) + "µs/op)");
			}

			// 1. === true (most common pattern: result === true)
			bench("=== true", function(n) {
			let count = 0;
			let v = true;
			for (let i = 0; i < n; i++)
			if (v === true) count++;
			return count;
			}, 10000000);

			// 2. === false
			bench("=== false", function(n) {
			let count = 0;
			let v = false;
			for (let i = 0; i < n; i++)
			if (v === false) count++;
			return count;
			}, 10000000);

			// 3. === undefined
			bench("=== undefined", function(n) {
			let count = 0;
			let v = undefined;
			for (let i = 0; i < n; i++)
			if (v === undefined) count++;
			return count;
			}, 10000000);

			// 4. === null
			bench("=== null", function(n) {
			let count = 0;
			let v = null;
			for (let i = 0; i < n; i++)
			if (v === null) count++;
			return count;
			}, 10000000);

			// 5. == null (coercing — catches both null and undefined)
			bench("== null", function(n) {
			let count = 0;
			let v = undefined;
			for (let i = 0; i < n; i++)
			if (v == null) count++;
			return count;
			}, 10000000);

			// 6. Branching on === true/false (switch-like pattern)
			bench("branch true/false/other", function(n) {
			let sum = 0;
			let vals = [true, false, 42];
			for (let i = 0; i < n; i++) {
			let v = vals[i % 3];
			if (v === true) sum += 1;
			else if (v === false) sum += 2;
			else sum += 3;
			}
			return sum;
			}, 5000000);

			// 7. Optional field check (obj.x === undefined)
			bench("field === undefined", function(n) {
			let o = { a: 1 };
			let count = 0;
			for (let i = 0; i < n; i++)
			if (o.b === undefined) count++;
			return count;
			}, 5000000);

			// 8. Truthiness after === (the truthy-dance pattern from newt)
			bench("(x === y) === true", function(n) {
			let count = 0;
			let a = 5, b = 5;
			for (let i = 0; i < n; i++)
			if ((a === b) === true) count++;
			return count;
			}, 10000000);

			// 9. !== undefined guard
			bench("!== undefined", function(n) {
			let count = 0;
			let v = 42;
			for (let i = 0; i < n; i++)
			if (v !== undefined) count++;
			return count;
			}, 10000000);

			// 10. Mixed constant comparisons in one function body
			bench("mixed const cmp", function(n) {
			let sum = 0;
			let t = true, f = false, u = undefined, z = null;
			for (let i = 0; i < n; i++) {
			if (t === true) sum++;
			if (f === false) sum++;
			if (u === undefined) sum++;
			if (z === null) sum++;
			}
			return sum;
			}, 5000000);

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