Add the code.google.com/p/dalvik benchmarks to libcore.

I'll remove them from code.google.com afterwards.

Change-Id: I369a301ed0e116c7971caebc607c5a86d06d4ee2

1 files changed, 132 insertions, 0 deletions

diff --git a/benchmarks/regression/StringBuilderBenchmark.java b/benchmarks/regression/StringBuilderBenchmark.java
new file mode 100644
index 0000000..79eff2a
--- /dev/null
+++ b/benchmarks/regression/StringBuilderBenchmark.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2009 Google Inc.
+ *
+ * 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.
+ */
+
+package benchmarks.regression;
+
+import com.google.caliper.Param;
+import com.google.caliper.Runner;
+import com.google.caliper.SimpleBenchmark;
+
+/**
+ * Tests the performance of various StringBuilder methods.
+ */
+public class StringBuilderBenchmark extends SimpleBenchmark {
+
+    @Param({"1", "10", "100"}) private int length;
+
+    public void timeAppendBoolean(int reps) {
+        for (int i = 0; i < reps; ++i) {
+            StringBuilder sb = new StringBuilder();
+            for (int j = 0; j < length; ++j) {
+                sb.append(true);
+            }
+        }
+    }
+
+    public void timeAppendChar(int reps) {
+        for (int i = 0; i < reps; ++i) {
+            StringBuilder sb = new StringBuilder();
+            for (int j = 0; j < length; ++j) {
+                sb.append('c');
+            }
+        }
+    }
+
+    public void timeAppendCharArray(int reps) {
+        char[] chars = "chars".toCharArray();
+        for (int i = 0; i < reps; ++i) {
+            StringBuilder sb = new StringBuilder();
+            for (int j = 0; j < length; ++j) {
+                sb.append(chars);
+            }
+        }
+    }
+
+    public void timeAppendCharSequence(int reps) {
+        CharSequence cs = "chars";
+        for (int i = 0; i < reps; ++i) {
+            StringBuilder sb = new StringBuilder();
+            for (int j = 0; j < length; ++j) {
+                sb.append(cs);
+            }
+        }
+    }
+
+    public void timeAppendDouble(int reps) {
+        double d = 1.2;
+        for (int i = 0; i < reps; ++i) {
+            StringBuilder sb = new StringBuilder();
+            for (int j = 0; j < length; ++j) {
+                sb.append(d);
+            }
+        }
+    }
+
+    public void timeAppendFloat(int reps) {
+        float f = 1.2f;
+        for (int i = 0; i < reps; ++i) {
+            StringBuilder sb = new StringBuilder();
+            for (int j = 0; j < length; ++j) {
+                sb.append(f);
+            }
+        }
+    }
+
+    public void timeAppendInt(int reps) {
+        int n = 123;
+        for (int i = 0; i < reps; ++i) {
+            StringBuilder sb = new StringBuilder();
+            for (int j = 0; j < length; ++j) {
+                sb.append(n);
+            }
+        }
+    }
+
+    public void timeAppendLong(int reps) {
+        long l = 123;
+        for (int i = 0; i < reps; ++i) {
+            StringBuilder sb = new StringBuilder();
+            for (int j = 0; j < length; ++j) {
+                sb.append(l);
+            }
+        }
+    }
+
+    public void timeAppendObject(int reps) {
+        // We don't want to time the toString, so ensure we're calling a trivial one...
+        Object o = new Object() {
+            @Override public String toString() {
+                return "constant";
+            }
+        };
+        for (int i = 0; i < reps; ++i) {
+            StringBuilder sb = new StringBuilder();
+            for (int j = 0; j < length; ++j) {
+                sb.append(o);
+            }
+        }
+    }
+
+    public void timeAppendString(int reps) {
+        String s = "chars";
+        for (int i = 0; i < reps; ++i) {
+            StringBuilder sb = new StringBuilder();
+            for (int j = 0; j < length; ++j) {
+                sb.append(s);
+            }
+        }
+    }
+}