Diffusion Ant (master) Code

ant/tests/bench_call_fallback.js
457d5953e6c8master

bench_call_fallback.js
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			// Benchmark: interpreter fallback-call overhead.
			//
			// This targets the paths in silver/engine.c that call sv_vm_call(...) and then
			// continue executing in the current frame. It is useful for tracking the cost
			// of refreshing cached frame/stack locals after re-entrant native calls.

			const now =
			typeof performance !== "undefined" && performance && typeof performance.now === "function"
			? () => performance.now()
			: () => Date.now();

			let sink = 0;

			function bench(name, iterations, fn) {
			for (let i = 0; i < 3; i++) fn(iterations >> 3 \|\| 1);

			const start = now();
			const ops = fn(iterations);
			const elapsed = now() - start;
			const nsPerOp = (elapsed * 1e6) / ops;
			const opsPerSec = (ops * 1000) / elapsed;

			console.log(
			name +
			": " +
			elapsed.toFixed(2) +
			"ms (" +
			ops +
			" ops, " +
			nsPerOp.toFixed(2) +
			" ns/op, " +
			opsPerSec.toFixed(0) +
			" ops/s)"
			);
			}

			function jsAdd(a, b) {
			return a + b;
			}

			bench("js direct call", 5000000, function(n) {
			let sum = 0;
			for (let i = 0; i < n; i++) sum += jsAdd(i, 1);
			sink = sum;
			return n;
			});

			bench("native method Math.abs", 5000000, function(n) {
			let sum = 0;
			for (let i = 0; i < n; i++) sum += Math.abs(-i);
			sink = sum;
			return n;
			});

			bench("native method Math.imul", 5000000, function(n) {
			let sum = 0;
			for (let i = 0; i < n; i++) sum += Math.imul(i, 3);
			sink = sum;
			return n;
			});

			bench("native method array push/pop", 3000000, function(n) {
			const arr = [];
			let sum = 0;
			for (let i = 0; i < n; i++) {
			arr.push(i);
			sum += arr.pop();
			}
			sink = sum + arr.length;
			return n * 2;
			});

			bench("native method string charCodeAt", 5000000, function(n) {
			const str = "fallback";
			let sum = 0;
			for (let i = 0; i < n; i++) sum += str.charCodeAt(i & 7);
			sink = sum;
			return n;
			});

			bench("native method Date.now", 1000000, function(n) {
			let sum = 0;
			for (let i = 0; i < n; i++) sum += Date.now() & 1;
			sink = sum;
			return n;
			});

			console.log("sink:", sink);

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