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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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