1 files changed, 50 insertions, 0 deletions
diff --git a/benchmarks/regression/LoopingBackwardsBenchmark.java b/benchmarks/regression/LoopingBackwardsBenchmark.java
new file mode 100644
index 0000000..054eff9
--- /dev/null
+++ b/benchmarks/regression/LoopingBackwardsBenchmark.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2010 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;
+
+/**
+ * Testing the old canard that looping backwards is faster.
+ *
+ * @author Kevin Bourrillion
+ */
+public class LoopingBackwardsBenchmark extends SimpleBenchmark {
+  @Param({"2", "20", "2000", "20000000"}) int max;
+
+  public int timeForwards(int reps) {
+    int dummy = 0;
+    for (int i = 0; i < reps; i++) {
+      for (int j = 0; j < max; j++) {
+        dummy += j;
+      }
+    }
+    return dummy;
+  }
+
+  public int timeBackwards(int reps) {
+    int dummy = 0;
+    for (int i = 0; i < reps; i++) {
+      for (int j = max - 1; j >= 0; j--) {
+        dummy += j;
+      }
+    }
+    return dummy;
+  }
+}