--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.snippets/src/com/oracle/graal/snippets/nodes/BitScanForwardNode.java	Tue Jul 24 17:32:42 2012 +0200
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2012, 2012, 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.snippets.nodes;
+
+import com.oracle.graal.api.meta.*;
+import com.oracle.graal.compiler.gen.*;
+import com.oracle.graal.compiler.target.*;
+import com.oracle.graal.lir.*;
+import com.oracle.graal.nodes.*;
+import com.oracle.graal.nodes.calc.*;
+import com.oracle.graal.nodes.spi.*;
+import com.oracle.graal.nodes.type.*;
+import com.oracle.graal.snippets.target.amd64.*;
+import com.oracle.graal.snippets.target.amd64.AMD64BitScanOp.IntrinsicOpcode;
+
+
+public class BitScanForwardNode extends FloatingNode implements LIRGenLowerable, Canonicalizable {
+    @Input private ValueNode value;
+
+    public BitScanForwardNode(ValueNode value) {
+        super(StampFactory.forInteger(Kind.Int, 0, value.kind().bits()));
+        this.value = value;
+    }
+
+    @Override
+    public ValueNode canonical(CanonicalizerTool tool) {
+        if (value.isConstant()) {
+            long v = value.asConstant().asLong();
+            if (kind().isInt()) {
+                return ConstantNode.forInt(Integer.numberOfTrailingZeros((int) v), graph());
+            } else if (kind().isLong()) {
+                return ConstantNode.forLong(Long.numberOfTrailingZeros(v), graph());
+            }
+        }
+        return this;
+    }
+
+    @NodeIntrinsic
+    public static int scan(@SuppressWarnings("unused") int v) {
+        throw new UnsupportedOperationException("This method may only be compiled with the Graal compiler");
+    }
+
+    @NodeIntrinsic
+    public static int scan(@SuppressWarnings("unused") long v) {
+        throw new UnsupportedOperationException("This method may only be compiled with the Graal compiler");
+    }
+
+    @Override
+    public void generate(LIRGenerator gen) {
+        Variable result = gen.newVariable(Kind.Int);
+        gen.append(new AMD64BitScanOp(IntrinsicOpcode.BSF, result, gen.operand(value)));
+        gen.setResult(this, result);
+    }
+
+}