[test] Add JSTest benchmark for array literal spread.

R=bmeurer@chromium.org

Bug: v8:5940
Change-Id: I8ce536f6f82225e8b05ef05a45eb3487360b14a2
Reviewed-on: https://chromium-review.googlesource.com/878126
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50778}

test/js-perf-test/ArrayLiteralSpread/run.js

@@ -0,0 +1,97 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+const input = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+
+
+// ----------------------------------------------------------------------------
+// Benchmark: Babel
+// ----------------------------------------------------------------------------
+
+function _toConsumableArray(arr) {
+  if (Array.isArray(arr)) {
+    for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) {
+      arr2[i] = arr[i];
+    }
+    return arr2;
+  } else {
+    return Array.from(arr);
+  }
+}
+
+function Babel() {
+  const result = [0].concat(_toConsumableArray(input));
+  if (result.length != 11) throw 666;
+}
+
+
+// ----------------------------------------------------------------------------
+// Benchmark: ForOfPush
+// ----------------------------------------------------------------------------
+
+
+function ForOfPush() {
+  const result = [0];
+  for (const x of input) {
+    result.push(x);
+  }
+  if (result.length != 11) throw 666;
+}
+
+
+// ----------------------------------------------------------------------------
+// Benchmark: ForOfSet
+// ----------------------------------------------------------------------------
+
+
+function ForOfSet() {
+  const result = [0];
+  for (const x of input) {
+    result[result.length] = x;
+  }
+  if (result.length != 11) throw 666;
+}
+
+
+// ----------------------------------------------------------------------------
+// Benchmark: Spread
+// ----------------------------------------------------------------------------
+
+
+function Spread() {
+  const result = [0, ...input];
+  if (result.length != 11) throw 666;
+}
+
+
+// ----------------------------------------------------------------------------
+// Setup and Run
+// ----------------------------------------------------------------------------
+
+load('../base.js');
+
+var success = true;
+
+function PrintResult(name, result) {
+  print(name + '-ArrayLiteralSpread(Score): ' + result);
+}
+
+function PrintError(name, error) {
+  PrintResult(name, error);
+  success = false;
+}
+
+function CreateBenchmark(name, f) {
+  new BenchmarkSuite(name, [100], [ new Benchmark(name, false, false, 0, f) ]);
+}
+
+CreateBenchmark('Babel', Babel);
+CreateBenchmark('ForOfPush', ForOfPush);
+CreateBenchmark('ForOfSet', ForOfSet);
+CreateBenchmark('Spread', Spread);
+
+BenchmarkSuite.config.doWarmup = undefined;
+BenchmarkSuite.config.doDeterministic = undefined;
+BenchmarkSuite.RunSuites({NotifyResult: PrintResult, NotifyError: PrintError});

test/js-perf-test/JSTests.json

@@ -59,6 +59,19 @@
       "flags": ["--harmony-function-sent"],
       "results_regexp": "^Generators\\-Generators\\(Score\\): (.+)$"
     },
+    {
+      "name": "ArrayLiteralSpread",
+      "path": ["ArrayLiteralSpread"],
+      "main": "run.js",
+      "resources": [],
+      "results_regexp": "^%s\\-ArrayLiteralSpread\\(Score\\): (.+)$",
+      "tests": [
+        {"name": "Babel"},
+        {"name": "ForOfPush"},
+        {"name": "ForOfSet"},
+        {"name": "Spread"}
+      ]
+    },
     {
       "name": "RestParameters",
       "path": ["RestParameters"],