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osr.js
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osr.js
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const N = 500000;
function bench(name, fn) {
let start = Date.now();
let result = fn();
let elapsed = Date.now() - start;
return { name, result, elapsed };
}
let t1_start = Date.now();
let sum = 0;
for (let i = 0; i < N; i++) {
sum = sum + i;
}
let t1_ms = Date.now() - t1_start;
let t1_expected = ((N - 1) * N) / 2;
console.log(`[test1] top-level loop: ${t1_ms}ms sum=${sum} ok=${sum === t1_expected}`);
function computeOnce(n) {
let total = 0;
for (let j = 0; j < n; j++) {
total = total + j;
}
return total;
}
let t2 = bench('once-called fn', () => computeOnce(N));
let t2_expected = ((N - 1) * N) / 2;
console.log(`[test2] ${t2.name}: ${t2.elapsed}ms result=${t2.result} ok=${t2.result === t2_expected}`);
function nestedLoops(outer, inner) {
let acc = 0;
for (let a = 0; a < outer; a++) {
for (let b = 0; b < inner; b++) acc = acc + 1;
}
return acc;
}
let t3 = bench('nested loops', () => nestedLoops(20, N / 20));
let t3_expected = 20 * (N / 20);
console.log(`[test3] ${t3.name}: ${t3.elapsed}ms result=${t3.result} ok=${t3.result === t3_expected}`);
function add(a, b) {
return a + b;
}
function loopWithCall(n) {
let s = 0;
for (let k = 0; k < n; k++) {
s = add(s, k);
}
return s;
}
let t4 = bench('loop + JIT callee', () => loopWithCall(N));
let t4_expected = ((N - 1) * N) / 2;
console.log(`[test4] ${t4.name}: ${t4.elapsed}ms result=${t4.result} ok=${t4.result === t4_expected}`);
function whileLoop(n) {
let count = 0;
let x = 0;
while (x < n) {
count = count + 1;
x = x + 1;
}
return count;
}
let t5 = bench('while loop', () => whileLoop(N));
console.log(`[test5] ${t5.name}: ${t5.elapsed}ms result=${t5.result} ok=${t5.result === N}`);
function localPreservation(n) {
let a = 42;
let b = 99;
let c = 0;
for (let i = 0; i < n; i++) {
c = c + 1;
}
return a + b + c;
}
let t6 = bench('local preservation', () => localPreservation(N));
let t6_expected = 42 + 99 + N;
console.log(`[test6] ${t6.name}: ${t6.elapsed}ms result=${t6.result} ok=${t6.result === t6_expected}`);
function hotAdd(a, b) {
return a + b;
}
for (let w = 0; w < 110; w++) hotAdd(w, w);
let t7_call = bench('hot fn (call_count JIT)', () => {
let s = 0;
for (let i = 0; i < N; i++) s = hotAdd(s, i);
return s;
});
let t7_osr = bench('cold fn (OSR JIT)', () => {
function coldLoop(n) {
let s = 0;
for (let i = 0; i < n; i++) s = s + i;
return s;
}
return coldLoop(N);
});
console.log(`[test7] ${t7_call.name}: ${t7_call.elapsed}ms`);
console.log(`[test7] ${t7_osr.name}: ${t7_osr.elapsed}ms`);
console.log(`[test7] results match: ${t7_call.result === t7_osr.result}`);
let allOk =
sum === t1_expected &&
t2.result === t2_expected &&
t3.result === t3_expected &&
t4.result === t4_expected &&
t5.result === N &&
t6.result === t6_expected &&
t7_call.result === t7_osr.result;
console.log('');
console.log('=== timing summary ===');
console.log(` top-level loop: ${t1_ms}ms`);
console.log(` once-called fn: ${t2.elapsed}ms`);
console.log(` nested loops: ${t3.elapsed}ms`);
console.log(` loop + JIT callee: ${t4.elapsed}ms`);
console.log(` while loop: ${t5.elapsed}ms`);
console.log(` local preservation: ${t6.elapsed}ms`);
console.log(` hot fn (call JIT): ${t7_call.elapsed}ms`);
console.log(` cold fn (OSR JIT): ${t7_osr.elapsed}ms`);
console.log('');
console.log('all OSR tests passed:', allOk);

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