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2a1499b04b
hashBits() is used to generate a hash code from the same 64 bits used to represent a Wren number as a double. When building a map containing a large number of integer keys, it's important for this to do a good job scattering the bits across the 32-bit key space. Alas, it does not. Worse, the benchmark to test this happens to stop just before the performance falls off a cliff, so this was easy to overlook. This replaces it with the hash function V8 uses, which has much better performance across the numeric range.
25 lines
487 B
Plaintext
25 lines
487 B
Plaintext
// Skipping this for now because it is >10x slower than the other languages (!)
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// and makes the benchmark running annoyingly slow.
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main() {
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Stopwatch watch = new Stopwatch();
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watch.start();
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var map = {};
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for (var i = 1; i <= 2000000; i++) {
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map[i] = i;
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}
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var sum = 0;
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for (var i = 1; i <= 2000000; i++) {
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sum += map[i];
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}
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print(sum);
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for (var i = 1; i <= 2000000; i++) {
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map.remove(i);
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}
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print("elapsed: ${watch.elapsedMilliseconds / 1000}");
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}
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