--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.lir/src/org/graalvm/compiler/lir/ssi/SSIBuilderBase.java	2016-12-09 00:54:32.437674723 -0800
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2016, 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 org.graalvm.compiler.lir.ssi;
+
+import java.util.BitSet;
+
+import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;
+import org.graalvm.compiler.debug.Debug;
+import org.graalvm.compiler.debug.GraalError;
+import org.graalvm.compiler.debug.Indent;
+import org.graalvm.compiler.lir.LIR;
+import org.graalvm.compiler.lir.StandardOp.BlockEndOp;
+import org.graalvm.compiler.lir.StandardOp.LabelOp;
+
+import jdk.vm.ci.meta.Value;
+
+public abstract class SSIBuilderBase {
+
+    protected static final int LOG_LEVEL = Debug.INFO_LOG_LEVEL;
+    protected final Value[] operands;
+    protected final LIR lir;
+
+    public SSIBuilderBase(LIR lir) {
+        this.lir = lir;
+        this.operands = new Value[lir.numVariables()];
+    }
+
+    protected LIR getLIR() {
+        return lir;
+    }
+
+    abstract BitSet getLiveIn(AbstractBlockBase<?> block);
+
+    abstract BitSet getLiveOut(AbstractBlockBase<?> block);
+
+    public final void build() {
+        buildIntern();
+        // check that the liveIn set of the first block is empty
+        AbstractBlockBase<?> startBlock = getLIR().getControlFlowGraph().getStartBlock();
+        if (getLiveIn(startBlock).cardinality() != 0) {
+            // bailout if this occurs in product mode.
+            throw new GraalError("liveIn set of first block must be empty: " + getLiveIn(startBlock));
+        }
+    }
+
+    protected abstract void buildIntern();
+
+    @SuppressWarnings("try")
+    public final void finish() {
+        // iterate all blocks in reverse order
+        for (AbstractBlockBase<?> block : (AbstractBlockBase<?>[]) lir.getControlFlowGraph().getBlocks()) {
+            try (Indent indent = Debug.logAndIndent(LOG_LEVEL, "Finish Block %s", block)) {
+                // set label
+                buildOutgoing(block, getLiveOut(block));
+                buildIncoming(block, getLiveIn(block));
+            }
+        }
+    }
+
+    private void buildIncoming(AbstractBlockBase<?> block, BitSet liveIn) {
+        /*
+         * Collect live out of predecessors since there might be values not used in this block which
+         * might cause out/in mismatch.
+         */
+        BitSet predLiveOut = new BitSet(liveIn.length());
+        for (AbstractBlockBase<?> pred : block.getPredecessors()) {
+            predLiveOut.or(getLiveOut(pred));
+        }
+        if (predLiveOut.isEmpty()) {
+            return;
+        }
+
+        Value[] values = new Value[predLiveOut.cardinality()];
+        assert values.length > 0;
+        int cnt = 0;
+        for (int i = predLiveOut.nextSetBit(0); i >= 0; i = predLiveOut.nextSetBit(i + 1)) {
+            values[cnt++] = liveIn.get(i) ? operands[i] : Value.ILLEGAL;
+        }
+        LabelOp label = SSIUtil.incoming(getLIR(), block);
+        label.addIncomingValues(values);
+    }
+
+    private void buildOutgoing(AbstractBlockBase<?> block, BitSet liveOut) {
+        if (liveOut.isEmpty()) {
+            return;
+        }
+        Value[] values = new Value[liveOut.cardinality()];
+        assert values.length > 0;
+        int cnt = 0;
+        for (int i = liveOut.nextSetBit(0); i >= 0; i = liveOut.nextSetBit(i + 1)) {
+            values[cnt++] = operands[i];
+        }
+        BlockEndOp blockEndOp = SSIUtil.outgoing(getLIR(), block);
+        blockEndOp.addOutgoingValues(values);
+    }
+}