--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/profiles/LongValueProfile.java	Wed Dec 16 16:38:13 2015 +0100
@@ -0,0 +1,156 @@
+/*
+ * Copyright (c) 2015, 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.profiles;
+
+import com.oracle.truffle.api.CompilerDirectives;
+import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
+import com.oracle.truffle.api.Truffle;
+
+/**
+ * <p>
+ * Specialized value profile to capture certain properties of <code>long</code> runtime values.
+ * Value profiles require a runtime check in their initialized state to verify their profiled
+ * assumption. Value profiles are limited to capture monomorphic profiles only. This means that if
+ * two or more values are profiled within a single profile then the profile has no effect. If the
+ * value assumption is invalidated in compiled code then it is invalidated.
+ * </p>
+ *
+ * <p>
+ * <b> Usage example: </b>
+ *
+ * <pre>
+ * class SampleNode extends Node {
+ *
+ *     final LongValueProfile profile = LongValueProfile.createIdentityProfile();
+ *
+ *     long execute(long input) {
+ *         long profiledValue = profile.profile(input);
+ *         // compiler may know now more about profiledValue
+ *         return profiledValue;
+ *     }
+ * }
+ * </pre>
+ * <p>
+ *
+ * {@inheritDoc}
+ *
+ * @see #createIdentityProfile()
+ * @see ValueProfile
+ */
+public abstract class LongValueProfile extends Profile {
+
+    LongValueProfile() {
+    }
+
+    public abstract long profile(long value);
+
+    /**
+     * Returns a value profile that profiles the exact value of an <code>long</code>.
+     *
+     * @see LongValueProfile
+     */
+    public static LongValueProfile createIdentityProfile() {
+        if (Truffle.getRuntime().isProfilingEnabled()) {
+            return Enabled.create();
+        } else {
+            return Disabled.INSTANCE;
+        }
+    }
+
+    static final class Enabled extends LongValueProfile {
+
+        private static final byte UNINITIALIZED = 0;
+        private static final byte SPECIALIZED = 1;
+        private static final byte GENERIC = 2;
+
+        @CompilationFinal private long cachedValue;
+        @CompilationFinal private byte state = 0;
+
+        @Override
+        public long profile(long value) {
+            byte localState = this.state;
+            if (localState != GENERIC) {
+                if (localState == SPECIALIZED) {
+                    long v = cachedValue;
+                    if (v == value) {
+                        return v;
+                    }
+                }
+                CompilerDirectives.transferToInterpreterAndInvalidate();
+                if (localState == UNINITIALIZED) {
+                    this.cachedValue = value;
+                    this.state = SPECIALIZED;
+                } else {
+                    this.state = GENERIC;
+                }
+            }
+            return value;
+        }
+
+        boolean isGeneric() {
+            return state == GENERIC;
+        }
+
+        boolean isUninitialized() {
+            return state == UNINITIALIZED;
+        }
+
+        long getCachedValue() {
+            return cachedValue;
+        }
+
+        @Override
+        public String toString() {
+            return toString(LongValueProfile.class, state == UNINITIALIZED, state == GENERIC, //
+                            String.format("value == (long)%s", cachedValue));
+        }
+
+        /* Needed for lazy class loading. */
+        static LongValueProfile create() {
+            return new Enabled();
+        }
+    }
+
+    static final class Disabled extends LongValueProfile {
+
+        static final LongValueProfile INSTANCE = new Disabled();
+
+        @Override
+        protected Object clone() {
+            return INSTANCE;
+        }
+
+        @Override
+        public long profile(long value) {
+            return value;
+        }
+
+        @Override
+        public String toString() {
+            return toStringDisabled(LongValueProfile.class);
+        }
+
+    }
+}