--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/CountingConditionProfile.java	Wed Jun 17 10:58:08 2015 +0200
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.api.utilities;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
+
+/**
+ * Utility class to speculate on conditions to be never true or to be never false. Additionally to
+ * {@link BinaryConditionProfile} this implementation of {@link ConditionProfile} also counts the
+ * number of times the condition was true and false. This information is reported to the underlying
+ * optimization system using {@link CompilerDirectives#injectBranchProbability(double, boolean)}.
+ * Condition profiles are intended to be used as part of if conditions.
+ *
+ * @see ConditionProfile#createCountingProfile()
+ */
+public final class CountingConditionProfile extends ConditionProfile {
+
+    @CompilationFinal private int trueCount;
+    @CompilationFinal private int falseCount;
+
+    CountingConditionProfile() {
+        /* package protected constructor */
+    }
+
+    @Override
+    public boolean profile(boolean value) {
+        if (value) {
+            if (trueCount == 0) {
+                CompilerDirectives.transferToInterpreterAndInvalidate();
+            }
+            if (CompilerDirectives.inInterpreter()) {
+                trueCount++;
+            }
+        } else {
+            if (falseCount == 0) {
+                CompilerDirectives.transferToInterpreterAndInvalidate();
+            }
+            if (CompilerDirectives.inInterpreter()) {
+                falseCount++;
+            }
+        }
+        return CompilerDirectives.injectBranchProbability((double) trueCount / (double) (trueCount + falseCount), value);
+    }
+
+    public int getTrueCount() {
+        return trueCount;
+    }
+
+    public int getFalseCount() {
+        return falseCount;
+    }
+
+    @Override
+    public String toString() {
+        return String.format("%s(trueCount=%s, falseCount=%s)@%x", getClass().getSimpleName(), trueCount, falseCount, hashCode());
+    }
+}