Diffusion Ant (master) Code

ant/tests/bench_lkp.js
dce8e2e6fb90master

bench_lkp.js
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			// Benchmark: property read paths (lkp_val vs lkp + propref)

			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. Global variable read (sv_global_get_interned)
			var gval = 42;
			bench("global read", function(n) {
			let sum = 0;
			for (let i = 0; i < n; i++) sum += gval;
			return sum;
			}, 5000000);

			// 2. Object property read
			bench("prop read", function(n) {
			let o = { x: 1, y: 2, z: 3 };
			let sum = 0;
			for (let i = 0; i < n; i++) sum += o.x + o.y + o.z;
			return sum;
			}, 5000000);

			// 3. Prototype chain lookup
			bench("proto chain read", function(n) {
			function Foo() {}
			let o = new Foo();
			let sum = 0;
			for (let i = 0; i < n; i++) sum += o.constructor ? 1 : 0;
			return sum;
			}, 1000000);

			// 4. Array .length read
			bench("array length read", function(n) {
			let arr = [1, 2, 3, 4, 5];
			let sum = 0;
			for (let i = 0; i < n; i++) sum += arr.length;
			return sum;
			}, 5000000);

			// 5. Function .name read
			bench("func name read", function(n) {
			function myFunc() {}
			let count = 0;
			for (let i = 0; i < n; i++) count += myFunc.name.length;
			return count;
			}, 1000000);

			// 6. Repeated prop reads on large object
			bench("10-prop obj repeated read", function(n) {
			let o = { a: 1, b: 2, c: 3, d: 4, e: 5, f: 6, g: 7, h: 8, i: 9, j: 10 };
			let sum = 0;
			for (let i = 0; i < n; i++) {
			sum += o.a + o.b + o.c + o.d + o.e + o.f + o.g + o.h + o.i + o.j;
			}
			return sum;
			}, 1000000);

			// 7. Constructor prototype lookup (string method)
			bench("ctor proto lookup", function(n) {
			let sum = 0;
			for (let i = 0; i < n; i++) {
			let s = "hello";
			sum += s.length;
			}
			return sum;
			}, 5000000);

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