[js-perf-test] Add microbenchmarks for Array.prototype.join/toString.

Bug: v8:1956
Change-Id: Ic4c67392af2337ac35f9473073dae01264c5ac00
Reviewed-on: https://chromium-review.googlesource.com/590428Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46957}

test/js-perf-test/Array/join.js

+// Copyright 2017 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.
+
+function benchy(name, test, testSetup) {
+  new BenchmarkSuite(name, [1000],
+      [
+        new Benchmark(name, false, false, 0, test, testSetup, ()=>{})
+      ]);
+}
+
+benchy('SmiJoin', SmiJoin, SmiJoinSetup);
+benchy('SmiJoin', SmiJoin, SmiJoinSetup);
+benchy('SparseSmiJoin', SparseSmiJoin, SparseSmiJoinSetup);
+benchy('SparseStringJoin', SparseStringJoin, SparseStringJoinSetup);
+
+var array;
+var result;
+var array_size = 1000;
+
+
+// Although these functions have the same code, they are separated for
+// clean IC feedback.
+function SmiJoin() {
+  result = array.join();
+}
+function StringJoin() {
+  result = array.join();
+}
+function SparseSmiJoin() {
+  result = array.join();
+}
+function SparseStringJoin() {
+  result = array.join();
+}
+
+function SmiJoinSetup() {
+  array = new Array();
+  for (var i = 0; i < array_size; ++i) array[i] = i;
+}
+function StringJoinSetup() {
+  array = new Array();
+  for (var i = 0; i < array_size; ++i) array[i] = `Item no. ${i}`;
+}
+function SparseSmiJoinSetup() {
+  SmiJoinSetup();
+  array.length = array.length * 2;
+}
+function SparseStringJoinSetup() {
+  StringJoinSetup();
+  array.length = array.length * 2;
+}

test/js-perf-test/Array/run.js

@@ -8,9 +8,11 @@ load('../base.js');
 load('filter.js');
 load('map.js');
 load('every.js');
+load('join.js');
 load('some.js');
 load('reduce.js');
 load('reduce-right.js');
+load('to-string.js');
 
 var success = true;
 

test/js-perf-test/Array/to-string.js

+// Copyright 2017 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.
+
+function benchy(name, test, testSetup) {
+  new BenchmarkSuite(name, [1000],
+      [
+        new Benchmark(name, false, false, 0, test, testSetup, ()=>{})
+      ]);
+}
+
+benchy('SmiToString', SmiToString, SmiToStringSetup);
+benchy('SmiToString', SmiToString, SmiToStringSetup);
+benchy('SparseSmiToString', SparseSmiToString, SparseSmiToStringSetup);
+benchy('SparseStringToString', SparseStringToString, SparseStringToStringSetup);
+
+var array;
+var result;
+var array_size = 1000;
+
+
+// Although these functions have the same code, they are separated for
+// clean IC feedback.
+function SmiToString() {
+  result = array.toString();
+}
+function StringToString() {
+  result = array.toString();
+}
+function SparseSmiToString() {
+  result = array.toString();
+}
+function SparseStringToString() {
+  result = array.toString();
+}
+
+function SmiToStringSetup() {
+  array = new Array();
+  for (var i = 0; i < array_size; ++i) array[i] = i;
+}
+function StringToStringSetup() {
+  array = new Array();
+  for (var i = 0; i < array_size; ++i) array[i] = `Item no. ${i}`;
+}
+function SparseSmiToStringSetup() {
+  SmiToStringSetup();
+  array.length = array.length * 2;
+}
+function SparseStringToStringSetup() {
+  StringToStringSetup();
+  array.length = array.length * 2;
+}

test/js-perf-test/JSTests.json

@@ -334,7 +334,8 @@
       "path": ["Array"],
       "main": "run.js",
       "resources": [
-        "filter.js", "map.js", "every.js", "some.js", "reduce.js", "reduce-right.js"
+        "filter.js", "map.js", "every.js", "join.js", "some.js",
+        "reduce.js", "reduce-right.js", "to-string.js"
       ],
       "flags": [
         "--allow-natives-syntax"
@@ -358,6 +359,10 @@
         {"name": "FastEvery"},
         {"name": "ObjectEvery"},
 	{"name": "OptFastEvery"},
+	      {"name": "SmiJoin"},
+	      {"name": "StringJoin"},
+	      {"name": "SparseSmiJoin"},
+	      {"name": "SparseStringJoin"},
         {"name": "DoubleSome"},
         {"name": "SmiSome"},
         {"name": "FastSome"},
@@ -372,7 +377,11 @@
         {"name": "SmiReduceRight"},
         {"name": "FastReduceRight"},
         {"name": "ObjectReduceRight"},
-	{"name": "OptFastReduceRight"}
+	{"name": "OptFastReduceRight"},
+	      {"name": "SmiToString"},
+	      {"name": "StringToString"},
+	      {"name": "SparseSmiToString"},
+	      {"name": "SparseStringToString"}
       ]
     },
     {