Robert Nystrom
e4c8b49dcc
Change-Id: I1362ada67a02b0ed352612fc29c727e94d8cd254 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/394901 Commit-Queue: Daco Harkes <dacoharkes@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Daco Harkes <dacoharkes@google.com>
47 lines
1.4 KiB
Dart
47 lines
1.4 KiB
Dart
// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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//
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// Measure performance of string comparison.
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// Using string interpolation could change what this test is measuring.
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// ignore_for_file: prefer_interpolation_to_compose_strings
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import 'package:benchmark_harness/benchmark_harness.dart';
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int equalCount = 0;
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class LongStringCompare extends BenchmarkBase {
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final int reps;
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final List<String> s = [];
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String generateLongString(int lengthPower) {
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return 'abc' * (1 << lengthPower) + 'def';
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}
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LongStringCompare(int lengthPower, this.reps)
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: super('LongStringCompare.${1 << lengthPower}.${reps}reps') {
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final single = generateLongString(lengthPower);
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s.add(single + '.' + single);
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s.add(single + '!' + single);
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}
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@override
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void run() {
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for (int i = 0; i < reps; i++) {
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// Make string comparison code hoisting harder for the compiler to do.
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final bool comparison = s[i % 2] == s[(i + 1) % 2];
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if (comparison) {
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equalCount++;
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}
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}
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}
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}
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void main() {
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LongStringCompare(1, 3000).report();
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LongStringCompare(5, 1000).report();
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LongStringCompare(10, 30).report();
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if (equalCount > 0) throw StateError('Unexpected equalCount: $equalCount');
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}
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