--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.loop/src/com/oracle/graal/loop/DerivedConvertedInductionVariable.java	Thu May 21 15:53:02 2015 +0200
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2015, 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.
+ *
+ * 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.graal.loop;
+
+import com.oracle.graal.compiler.common.type.*;
+import com.oracle.graal.nodes.*;
+import com.oracle.graal.nodes.calc.*;
+
+public class DerivedConvertedInductionVariable extends DerivedInductionVariable {
+
+    private final Stamp stamp;
+    private final ValueNode value;
+
+    public DerivedConvertedInductionVariable(LoopEx loop, InductionVariable base, Stamp stamp, ValueNode value) {
+        super(loop, base);
+        this.stamp = stamp;
+        this.value = value;
+    }
+
+    @Override
+    public ValueNode valueNode() {
+        return value;
+    }
+
+    @Override
+    public Direction direction() {
+        return base.direction();
+    }
+
+    @Override
+    public ValueNode initNode() {
+        return IntegerConvertNode.convert(base.initNode(), stamp, graph());
+    }
+
+    @Override
+    public ValueNode strideNode() {
+        return IntegerConvertNode.convert(base.strideNode(), stamp, graph());
+    }
+
+    @Override
+    public boolean isConstantInit() {
+        return base.isConstantInit();
+    }
+
+    @Override
+    public boolean isConstantStride() {
+        return base.isConstantStride();
+    }
+
+    @Override
+    public long constantInit() {
+        return base.constantInit();
+    }
+
+    @Override
+    public long constantStride() {
+        return base.constantStride();
+    }
+
+    @Override
+    public ValueNode extremumNode(boolean assumePositiveTripCount, Stamp s) {
+        return base.extremumNode(assumePositiveTripCount, s);
+    }
+
+    @Override
+    public ValueNode exitValueNode() {
+        return IntegerConvertNode.convert(base.exitValueNode(), stamp, graph());
+    }
+
+    @Override
+    public boolean isConstantExtremum() {
+        return base.isConstantExtremum();
+    }
+
+    @Override
+    public long constantExtremum() {
+        return base.constantExtremum();
+    }
+
+    @Override
+    public void deleteUnusedNodes() {
+    }
+
+    @Override
+    public String toString() {
+        return String.format("DerivedConvertedInductionVariable base (%s) %s %s", base, value.getNodeClass().shortName(), stamp);
+    }
+}

--- a/graal/com.oracle.graal.loop/src/com/oracle/graal/loop/DerivedScaledInductionVariable.java	Thu May 21 15:00:11 2015 +0200
+++ b/graal/com.oracle.graal.loop/src/com/oracle/graal/loop/DerivedScaledInductionVariable.java	Thu May 21 15:53:02 2015 +0200
@@ -42,7 +42,7 @@
 
     public DerivedScaledInductionVariable(LoopEx loop, InductionVariable base, NegateNode value) {
         super(loop, base);
-        this.scale = ConstantNode.forInt(-1, value.graph());
+        this.scale = ConstantNode.forIntegerStamp(value.stamp(), -1, value.graph());
         this.value = value;
     }
 

--- a/graal/com.oracle.graal.loop/src/com/oracle/graal/loop/LoopEx.java	Thu May 21 15:00:11 2015 +0200
+++ b/graal/com.oracle.graal.loop/src/com/oracle/graal/loop/LoopEx.java	Thu May 21 15:53:02 2015 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 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
@@ -333,6 +333,16 @@
                     iv = new DerivedScaledInductionVariable(loop, baseIv, (NegateNode) op);
                 } else if ((scale = mul(loop, op, baseIvNode)) != null) {
                     iv = new DerivedScaledInductionVariable(loop, baseIv, scale, op);
+                } else {
+                    boolean isValidConvert = op instanceof PiNode || op instanceof SignExtendNode;
+                    if (!isValidConvert && op instanceof ZeroExtendNode) {
+                        IntegerStamp inputStamp = (IntegerStamp) ((ZeroExtendNode) op).getValue().stamp();
+                        isValidConvert = inputStamp.isPositive();
+                    }
+
+                    if (isValidConvert) {
+                        iv = new DerivedConvertedInductionVariable(loop, baseIv, op.stamp(), op);
+                    }
                 }
 
                 if (iv != null) {
@@ -368,7 +378,7 @@
         if (op instanceof LeftShiftNode) {
             LeftShiftNode shift = (LeftShiftNode) op;
             if (shift.getX() == base && shift.getY().isConstant()) {
-                return ConstantNode.forInt(1 << shift.getY().asJavaConstant().asInt(), base.graph());
+                return ConstantNode.forIntegerStamp(base.stamp(), 1 << shift.getY().asJavaConstant().asInt(), base.graph());
             }
         }
         return null;