1 files changed, 62 insertions, 0 deletions
diff --git a/benchmark/stringbuilder-append/src/StringBuilderAppendBenchmark.java b/benchmark/stringbuilder-append/src/StringBuilderAppendBenchmark.java
new file mode 100644
index 0000000000..1550e81bf7
--- /dev/null
+++ b/benchmark/stringbuilder-append/src/StringBuilderAppendBenchmark.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+public class StringBuilderAppendBenchmark {
+    public static String string1 = "s1";
+    public static String string2 = "s2";
+    public static String longString1 = "This is a long string 1";
+    public static String longString2 = "This is a long string 2";
+    public static int int1 = 42;
+
+    public void timeAppendStrings(int count) {
+        String s1 = string1;
+        String s2 = string2;
+        int sum = 0;
+        for (int i = 0; i < count; ++i) {
+            String result = s1 + s2;
+            sum += result.length();  // Make sure the append is not optimized away.
+        }
+        if (sum != count * (s1.length() + s2.length())) {
+            throw new AssertionError();
+        }
+    }
+
+    public void timeAppendLongStrings(int count) {
+        String s1 = longString1;
+        String s2 = longString2;
+        int sum = 0;
+        for (int i = 0; i < count; ++i) {
+            String result = s1 + s2;
+            sum += result.length();  // Make sure the append is not optimized away.
+        }
+        if (sum != count * (s1.length() + s2.length())) {
+            throw new AssertionError();
+        }
+    }
+
+    public void timeAppendStringAndInt(int count) {
+        String s1 = string1;
+        int i1 = int1;
+        int sum = 0;
+        for (int i = 0; i < count; ++i) {
+            String result = s1 + i1;
+            sum += result.length();  // Make sure the append is not optimized away.
+        }
+        if (sum != count * (s1.length() + Integer.toString(i1).length())) {
+            throw new AssertionError();
+        }
+    }
+}