bench_call_fallback.js
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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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