diff --git a/teavm-classlib/pom.xml b/teavm-classlib/pom.xml
index 1bf13a0ec..da8355cad 100644
--- a/teavm-classlib/pom.xml
+++ b/teavm-classlib/pom.xml
@@ -54,6 +54,9 @@
             <configuration>
               <minifying>false</minifying>
               <numThreads>1</numThreads>
+              <wildcards>
+                <param>**.ArraysTest</param>
+              </wildcards>
             </configuration>
           </execution>
         </executions>
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TArrayList.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TArrayList.java
index 761cf083e..943794448 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TArrayList.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TArrayList.java
@@ -128,10 +128,10 @@ public class TArrayList<E> extends TAbstractList<E> implements TCloneable, TSeri
         }
         ensureCapacity(size + c.size());
         int gap = c.size();
-        size += gap;
-        for (int i = gap - 1; i > index; --i) {
-            array[i] = array[i - gap];
+        for (int i = size - 1; i >= index; --i) {
+            array[i + gap] = array[i];
         }
+        size += gap;
         TIterator<? extends E> iter = c.iterator();
         for (int i = 0; i < gap; ++i) {
             array[index++] = iter.next();
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java
index 9cc2a55d3..10598dd18 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java
@@ -182,4 +182,99 @@ public class TArrays extends TObject {
     public static void fill(TObject[] a, TObject val) {
         fill(a, 0, a.length, val);
     }
+
+
+    public static void sort(Object[] a) {
+        sort(a, new NaturalOrder());
+    }
+
+    public static void sort(Object[] a, int fromIndex, int toIndex) {
+        sort(a, fromIndex, toIndex, new NaturalOrder());
+    }
+
+    private static class NaturalOrder implements TComparator<Object> {
+        @SuppressWarnings({ "rawtypes", "unchecked" })
+        @Override public int compare(Object o1, Object o2) {
+            if (o1 != null) {
+                return ((TComparable)o1).compareTo((TComparable)o2);
+            } else if (o2 != null) {
+                return ((TComparable)o2).compareTo((TComparable)o1);
+            } else {
+                return 0;
+            }
+        }
+    }
+
+    public static <T> void sort(T[] a, int fromIndex, int toIndex, TComparator<? super T> c) {
+        @SuppressWarnings("unchecked")
+        T[] subarray = (T[])new Object[toIndex - fromIndex];
+        for (int i = fromIndex; i < toIndex; ++i) {
+            subarray[i - fromIndex] = a[i];
+        }
+        sort(subarray, c);
+        for (int i = fromIndex; i < toIndex; ++i) {
+            a[i] = subarray[i - fromIndex];
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public static <T> void sort(T[] a, TComparator<? super T> c) {
+        Object[] first = a;
+        Object[] second = new Object[a.length];
+        int chunkSize = 1;
+        while (chunkSize < a.length) {
+            for (int i = 0; i < first.length; i += chunkSize * 2) {
+                merge(first, second, i, Math.min(first.length, i + chunkSize),
+                        Math.min(first.length, i + 2 * chunkSize), (TComparator<Object>)c);
+            }
+            Object[] tmp = first;
+            first = second;
+            second = tmp;
+            chunkSize *= 2;
+        }
+        if (first != a) {
+            for (int i = 0; i < first.length; ++i) {
+                second[i] = first[i];
+            }
+        }
+    }
+
+    private static void merge(Object[] a, Object[] b, int from, int split, int to, TComparator<Object> comp) {
+        int index = from;
+        int from2 = split;
+        while (true) {
+            if (from == split) {
+                while (from2 < to) {
+                    b[index++] = a[from2++];
+                }
+                break;
+            } else if (from2 == to) {
+                while (from < split) {
+                    b[index++] = a[from++];
+                }
+                break;
+            }
+            Object p = a[from];
+            Object q = a[from2];
+            if (comp.compare(p, q) <= 0) {
+                b[index++] = p;
+                ++from;
+            } else {
+                b[index++] = q;
+                ++from2;
+            }
+        }
+    }
+
+    @SafeVarargs
+    public static <T> TList<T> asList(final T... a) {
+        return new TAbstractList<T>() {
+            @Override public T get(int index) {
+                return a[index];
+            }
+            @Override public int size() {
+                return a.length;
+            }
+        };
+    }
 }
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TCollections.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TCollections.java
new file mode 100644
index 000000000..ef02b031c
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TCollections.java
@@ -0,0 +1,135 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.java.util;
+
+import org.teavm.classlib.java.lang.*;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public class TCollections extends TObject {
+    public static <T> TIterator<T> emptyIterator() {
+        return new TIterator<T>() {
+            @Override public boolean hasNext() {
+                return false;
+            }
+            @Override public T next() {
+                throw new TNoSuchElementException();
+            }
+            @Override public void remove() {
+                throw new TIllegalStateException();
+            }
+        };
+    }
+
+    public static <T> TListIterator<T> emptyListIterator() {
+        return new TListIterator<T>() {
+            @Override public boolean hasNext() {
+                return false;
+            }
+            @Override public T next() {
+                throw new TNoSuchElementException();
+            }
+            @Override public void remove() {
+                throw new TIllegalStateException();
+            }
+            @Override public boolean hasPrevious() {
+                return false;
+            }
+            @Override public T previous() {
+                throw new TNoSuchElementException();
+            }
+            @Override public int nextIndex() {
+                return 0;
+            }
+            @Override public int previousIndex() {
+                return -1;
+            }
+            @Override public void set(T e) {
+                throw new TUnsupportedOperationException();
+            }
+            @Override public void add(T e) {
+                throw new TUnsupportedOperationException();
+            }
+        };
+    }
+
+    public static final <T> TList<T> emptyList() {
+        return new TAbstractList<T>() {
+            @Override public T get(int index) {
+                throw new TIndexOutOfBoundsException();
+            }
+            @Override public int size() {
+                return 0;
+            }
+        };
+    }
+
+    public static <T> TList<T> singletonList(final T o) {
+        return new TAbstractList<T>() {
+            @Override public T get(int index) {
+                if (index != 0) {
+                    throw new TIndexOutOfBoundsException();
+                }
+                return o;
+            }
+            @Override public int size() {
+                return 1;
+            }
+        };
+    }
+
+    public static <T> TList<T> nCopies(final int n, final T o) {
+        return new TAbstractList<T>() {
+            @Override public T get(int index) {
+                if (index < 0 || index >= n) {
+                    throw new TIndexOutOfBoundsException();
+                }
+                return o;
+            }
+            @Override public int size() {
+                return n;
+            }
+        };
+    }
+
+    public static void swap(TList<?> list, int i, int j) {
+        @SuppressWarnings("unchecked")
+        TList<Object> objList = (TList<Object>)list;
+        Object tmp = objList.get(i);
+        objList.set(i, objList.get(j));
+        objList.set(j, tmp);
+    }
+
+    public static <T> void sort(TList<T> list, TComparator<? super T> c) {
+        @SuppressWarnings("unchecked")
+        T[] array = (T[])new Object[list.size()];
+        list.toArray(array);
+        TArrays.sort(array, c);
+        for (int i = 0; i < array.length; ++i) {
+            list.set(i, array[i]);
+        }
+    }
+
+    public static <T extends TComparable<? super T>> void sort(TList<T> list) {
+        sort(list, new TComparator<T>() {
+            @Override public int compare(T o1, T o2) {
+                return o1 != null ? o1.compareTo(o2) : -o2.compareTo(o1);
+            }
+        });
+    }
+}
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TComparator.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TComparator.java
index 1e8435af6..9cd08220f 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TComparator.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TComparator.java
@@ -15,14 +15,10 @@
  */
 package org.teavm.classlib.java.util;
 
-import org.teavm.classlib.java.lang.TObject;
-
 /**
  *
  * @author Alexey Andreev <konsoletyper@gmail.com>
  */
-public interface TComparator<T extends TObject> {
+public interface TComparator<T> {
     int compare(T o1, T o2);
-
-    boolean equals(TObject obj);
 }
diff --git a/teavm-classlib/src/test/java/org/teavm/classlib/java/lang/util/ArrayListTest.java b/teavm-classlib/src/test/java/org/teavm/classlib/java/lang/util/ArrayListTest.java
index 57ca456ad..ac15aaaee 100644
--- a/teavm-classlib/src/test/java/org/teavm/classlib/java/lang/util/ArrayListTest.java
+++ b/teavm-classlib/src/test/java/org/teavm/classlib/java/lang/util/ArrayListTest.java
@@ -78,6 +78,35 @@ public class ArrayListTest {
         }
     }
 
+    @Test
+    public void manyElementsAdded() {
+        List<Integer> list = fillFromZeroToNine();
+        list.addAll(3, fillFromZeroToNine());
+        assertEquals(20, list.size());
+        assertEquals(Integer.valueOf(2), list.get(2));
+        assertEquals(Integer.valueOf(0), list.get(3));
+        assertEquals(Integer.valueOf(9), list.get(12));
+        assertEquals(Integer.valueOf(3), list.get(13));
+        assertEquals(Integer.valueOf(9), list.get(19));
+    }
+
+    @Test
+    public void manyElementsRemoved() {
+        List<Integer> list = fillFromZeroToNine();
+        list.subList(2, 4).clear();
+        assertEquals(8, list.size());
+        assertEquals(Integer.valueOf(1), list.get(1));
+        assertEquals(Integer.valueOf(4), list.get(2));
+        assertEquals(Integer.valueOf(9), list.get(7));
+    }
+
+    @Test
+    public void elementIndexFound() {
+        List<Integer> list = fillFromZeroToNine();
+        assertEquals(3, list.indexOf(3));
+        assertEquals(-1, list.indexOf(100));
+    }
+
     private List<Integer> fillFromZeroToNine() {
         List<Integer> list = new ArrayList<>();
         for (int i = 0; i < 10; ++i) {
diff --git a/teavm-classlib/src/test/java/org/teavm/classlib/java/lang/util/ArraysTest.java b/teavm-classlib/src/test/java/org/teavm/classlib/java/lang/util/ArraysTest.java
new file mode 100644
index 000000000..2fb4597dc
--- /dev/null
+++ b/teavm-classlib/src/test/java/org/teavm/classlib/java/lang/util/ArraysTest.java
@@ -0,0 +1,47 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.java.lang.util;
+
+import static org.junit.Assert.*;
+import java.util.Arrays;
+import java.util.List;
+import org.junit.Test;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public class ArraysTest {
+    @Test
+    public void arraySorted() {
+        Integer[] array = { 2, 5, 7, 3, 5, 6 };
+        Arrays.sort(array);
+        assertEquals(Integer.valueOf(2), array[0]);
+        assertEquals(Integer.valueOf(3), array[1]);
+        assertEquals(Integer.valueOf(5), array[2]);
+        assertEquals(Integer.valueOf(5), array[3]);
+        assertEquals(Integer.valueOf(6), array[4]);
+        assertEquals(Integer.valueOf(7), array[5]);
+    }
+
+    @Test
+    public void arrayExposedAsList() {
+        Integer[] array = { 2, 3, 4 };
+        List<Integer> list = Arrays.asList(array);
+        assertEquals(3, list.size());
+        assertEquals(Integer.valueOf(4), list.get(2));
+    }
+}
diff --git a/teavm-core/src/main/java/org/teavm/common/GraphBuilder.java b/teavm-core/src/main/java/org/teavm/common/GraphBuilder.java
index 4f6bfdd03..e3b965916 100644
--- a/teavm-core/src/main/java/org/teavm/common/GraphBuilder.java
+++ b/teavm-core/src/main/java/org/teavm/common/GraphBuilder.java
@@ -43,8 +43,8 @@ public class GraphBuilder {
     }
 
     public void addEdge(int from, int to) {
-        if (to < 0) {
-            throw new IllegalArgumentException("To is negative: " + to);
+        if (to < 0 || from < 0) {
+            throw new IllegalArgumentException();
         }
         sz = Math.max(sz, Math.max(from, to) + 1);
         builtGraph = null;
diff --git a/teavm-core/src/main/java/org/teavm/dependency/DependencyChecker.java b/teavm-core/src/main/java/org/teavm/dependency/DependencyChecker.java
index b08c5d9ef..12c965910 100644
--- a/teavm-core/src/main/java/org/teavm/dependency/DependencyChecker.java
+++ b/teavm-core/src/main/java/org/teavm/dependency/DependencyChecker.java
@@ -141,7 +141,6 @@ public class DependencyChecker implements DependencyInfo {
     }
 
     public void schedulePropagation(final DependencyConsumer consumer, final String type) {
-        System.out.print("");
         executor.executeFast(new Runnable() {
             @Override public void run() {
                 consumer.consume(type);
diff --git a/teavm-core/src/main/java/org/teavm/dependency/DependencyNodeToNodeTransition.java b/teavm-core/src/main/java/org/teavm/dependency/DependencyNodeToNodeTransition.java
index b13d1a467..d6be0a30a 100644
--- a/teavm-core/src/main/java/org/teavm/dependency/DependencyNodeToNodeTransition.java
+++ b/teavm-core/src/main/java/org/teavm/dependency/DependencyNodeToNodeTransition.java
@@ -41,8 +41,8 @@ class DependencyNodeToNodeTransition implements DependencyConsumer {
         }
         if (!destination.hasType(type)) {
             destination.propagate(type);
-            source.getArrayItem().connect(destination.getArrayItem());
-            destination.getArrayItem().connect(source.getArrayItem());
         }
+        source.getArrayItem().connect(destination.getArrayItem());
+        destination.getArrayItem().connect(source.getArrayItem());
     }
 }
diff --git a/teavm-core/src/main/java/org/teavm/model/util/InstructionVariableMapper.java b/teavm-core/src/main/java/org/teavm/model/util/InstructionVariableMapper.java
new file mode 100644
index 000000000..49eb8ca05
--- /dev/null
+++ b/teavm-core/src/main/java/org/teavm/model/util/InstructionVariableMapper.java
@@ -0,0 +1,226 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.model.util;
+
+import org.teavm.model.Variable;
+import org.teavm.model.instructions.*;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public abstract class InstructionVariableMapper implements InstructionVisitor {
+    protected abstract Variable map(Variable var);
+
+    @Override
+    public void visit(EmptyInstruction insn) {
+    }
+
+    @Override
+    public void visit(ClassConstantInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+    }
+
+    @Override
+    public void visit(NullConstantInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+    }
+
+    @Override
+    public void visit(IntegerConstantInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+    }
+
+    @Override
+    public void visit(LongConstantInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+    }
+
+    @Override
+    public void visit(FloatConstantInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+    }
+
+    @Override
+    public void visit(DoubleConstantInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+    }
+
+    @Override
+    public void visit(StringConstantInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+    }
+
+    @Override
+    public void visit(BinaryInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        insn.setFirstOperand(map(insn.getFirstOperand()));
+        insn.setSecondOperand(map(insn.getSecondOperand()));
+    }
+
+    @Override
+    public void visit(NegateInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        insn.setOperand(map(insn.getOperand()));
+    }
+
+    @Override
+    public void visit(AssignInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        insn.setAssignee(map(insn.getAssignee()));
+    }
+
+    @Override
+    public void visit(CastInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        insn.setValue(map(insn.getValue()));
+    }
+
+    @Override
+    public void visit(CastNumberInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        insn.setValue(map(insn.getValue()));
+    }
+
+    @Override
+    public void visit(CastIntegerInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        insn.setValue(map(insn.getValue()));
+    }
+
+    @Override
+    public void visit(BranchingInstruction insn) {
+        insn.setOperand(map(insn.getOperand()));
+    }
+
+    @Override
+    public void visit(BinaryBranchingInstruction insn) {
+        insn.setFirstOperand(map(insn.getFirstOperand()));
+        insn.setSecondOperand(map(insn.getSecondOperand()));
+    }
+
+    @Override
+    public void visit(JumpInstruction insn) {
+    }
+
+    @Override
+    public void visit(SwitchInstruction insn) {
+        insn.setCondition(insn.getCondition());
+    }
+
+    @Override
+    public void visit(ExitInstruction insn) {
+        if (insn.getValueToReturn() != null) {
+            insn.setValueToReturn(map(insn.getValueToReturn()));
+        }
+    }
+
+    @Override
+    public void visit(RaiseInstruction insn) {
+        insn.setException(map(insn.getException()));
+    }
+
+    @Override
+    public void visit(ConstructArrayInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        insn.setSize(map(insn.getSize()));
+    }
+
+    @Override
+    public void visit(ConstructInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+    }
+
+    @Override
+    public void visit(ConstructMultiArrayInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        for (int i = 0; i < insn.getDimensions().size(); ++i) {
+            insn.getDimensions().set(i, map(insn.getDimensions().get(i)));
+        }
+    }
+
+    @Override
+    public void visit(GetFieldInstruction insn) {
+        if (insn.getInstance() != null) {
+            insn.setInstance(map(insn.getInstance()));
+        }
+        insn.setReceiver(map(insn.getReceiver()));
+    }
+
+    @Override
+    public void visit(PutFieldInstruction insn) {
+        if (insn.getInstance() != null) {
+            insn.setInstance(map(insn.getInstance()));
+        }
+        insn.setValue(map(insn.getValue()));
+    }
+
+    @Override
+    public void visit(ArrayLengthInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        insn.setArray(map(insn.getArray()));
+    }
+
+    @Override
+    public void visit(CloneArrayInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        insn.setArray(map(insn.getArray()));
+    }
+
+    @Override
+    public void visit(UnwrapArrayInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        insn.setArray(map(insn.getArray()));
+    }
+
+    @Override
+    public void visit(GetElementInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        insn.setArray(map(insn.getArray()));
+        insn.setIndex(map(insn.getIndex()));
+    }
+
+    @Override
+    public void visit(PutElementInstruction insn) {
+        insn.setValue(map(insn.getValue()));
+        insn.setArray(map(insn.getArray()));
+        insn.setIndex(map(insn.getIndex()));
+    }
+
+    @Override
+    public void visit(InvokeInstruction insn) {
+        if (insn.getReceiver() != null) {
+            insn.setReceiver(map(insn.getReceiver()));
+        }
+        if (insn.getInstance() != null) {
+            insn.setInstance(map(insn.getInstance()));
+        }
+        for (int i = 0; i < insn.getArguments().size(); ++i) {
+            insn.getArguments().set(i, map(insn.getArguments().get(i)));
+        }
+    }
+
+    @Override
+    public void visit(IsInstanceInstruction insn) {
+        insn.setReceiver(map(insn.getReceiver()));
+        insn.setValue(map(insn.getValue()));
+    }
+
+    @Override
+    public void visit(InitClassInstruction insn) {
+    }
+
+}
diff --git a/teavm-core/src/main/java/org/teavm/model/util/RegisterAllocator.java b/teavm-core/src/main/java/org/teavm/model/util/RegisterAllocator.java
index c991cfeb8..78d2fd03c 100644
--- a/teavm-core/src/main/java/org/teavm/model/util/RegisterAllocator.java
+++ b/teavm-core/src/main/java/org/teavm/model/util/RegisterAllocator.java
@@ -150,11 +150,15 @@ public class RegisterAllocator {
                 copy.incoming.setValue(program.variableAt(copy.original));
                 for (MutableGraphEdge edge : interferenceGraph.get(varClass).getEdges()
                         .toArray(new MutableGraphEdge[0])) {
-                    edge.setFirst(interferenceGraph.get(newClass));
+                    if (edge.getFirst() != null) {
+                        edge.setFirst(interferenceGraph.get(newClass));
+                    }
                 }
                 for (MutableGraphEdge edge : interferenceGraph.get(origClass).getEdges()
                         .toArray(new MutableGraphEdge[0])) {
-                    edge.setFirst(interferenceGraph.get(newClass));
+                    if (edge.getFirst() != null) {
+                        edge.setFirst(interferenceGraph.get(newClass));
+                    }
                 }
             }
         }
diff --git a/teavm-core/src/main/java/org/teavm/optimization/ClassSetOptimizer.java b/teavm-core/src/main/java/org/teavm/optimization/ClassSetOptimizer.java
index 4c7073f0f..c926727e6 100644
--- a/teavm-core/src/main/java/org/teavm/optimization/ClassSetOptimizer.java
+++ b/teavm-core/src/main/java/org/teavm/optimization/ClassSetOptimizer.java
@@ -36,7 +36,7 @@ public class ClassSetOptimizer {
     }
 
     private List<MethodOptimization> getOptimizations() {
-        return Arrays.<MethodOptimization>asList(new CommonSubexpressionElimination(), new UnusedVariableElimination());
+        return Arrays.<MethodOptimization>asList(new UnusedVariableElimination());
     }
 
     public void optimizeAll(ListableClassHolderSource classSource) {
diff --git a/teavm-core/src/main/java/org/teavm/optimization/CommonSubexpressionElimination.java b/teavm-core/src/main/java/org/teavm/optimization/CommonSubexpressionElimination.java
index 916854413..397621e90 100644
--- a/teavm-core/src/main/java/org/teavm/optimization/CommonSubexpressionElimination.java
+++ b/teavm-core/src/main/java/org/teavm/optimization/CommonSubexpressionElimination.java
@@ -15,7 +15,9 @@
  */
 package org.teavm.optimization;
 
+import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import org.teavm.common.DominatorTree;
 import org.teavm.common.Graph;
@@ -52,6 +54,7 @@ public class CommonSubexpressionElimination implements MethodOptimization {
         for (int i = 0; i < map.length; ++i) {
             map[i] = i;
         }
+        List<List<Incoming>> outgoings = findOutgoings(program);
 
         int[] stack = new int[cfg.size() * 2];
         int top = 0;
@@ -64,7 +67,7 @@ public class CommonSubexpressionElimination implements MethodOptimization {
             int v = stack[--top];
             currentBlockIndex = v;
             BasicBlock block = program.basicBlockAt(v);
-            for (int i = 0; i < block.getPhis().size(); ++i) {
+            /*for (int i = 0; i < block.getPhis().size(); ++i) {
                 Phi phi = block.getPhis().get(i);
                 int sharedValue = -2;
                 for (Incoming incoming : phi.getIncomings()) {
@@ -77,32 +80,31 @@ public class CommonSubexpressionElimination implements MethodOptimization {
                     }
                 }
                 if (sharedValue != -1) {
-                    map[phi.getReceiver().getIndex()] = sharedValue;
+                    if (sharedValue != -2) {
+                        AssignInstruction assignInsn = new AssignInstruction();
+                        assignInsn.setReceiver(phi.getReceiver());
+                        assignInsn.setAssignee(program.variableAt(sharedValue));
+                        block.getInstructions().add(0, assignInsn);
+                    }
                     block.getPhis().remove(i--);
                 }
-            }
+            }*/
             for (int i = 0; i < block.getInstructions().size(); ++i) {
                 Instruction currentInsn = block.getInstructions().get(i);
                 currentInsn.acceptVisitor(optimizer);
                 if (eliminate) {
-                    block.getInstructions().remove(i--);
+                    block.getInstructions().set(i, new EmptyInstruction());
                     eliminate = false;
                 }
             }
+            for (Incoming incoming : outgoings.get(v)) {
+                int value = map[incoming.getValue().getIndex()];
+                incoming.setValue(program.variableAt(value));
+            }
             for (int succ : dom.outgoingEdges(v)) {
                 stack[top++] = succ;
             }
         }
-        for (int v = 0; v < program.basicBlockCount(); ++v) {
-            BasicBlock block = program.basicBlockAt(v);
-            for (int i = 0; i < block.getPhis().size(); ++i) {
-                Phi phi = block.getPhis().get(i);
-                for (Incoming incoming : phi.getIncomings()) {
-                    int value = map[incoming.getValue().getIndex()];
-                    incoming.setValue(program.variableAt(value));
-                }
-            }
-        }
 
         for (int i = 0; i < map.length; ++i) {
             if (map[i] != i) {
@@ -114,6 +116,21 @@ public class CommonSubexpressionElimination implements MethodOptimization {
         program = null;
     }
 
+    private List<List<Incoming>> findOutgoings(Program program) {
+        List<List<Incoming>> outgoings = new ArrayList<>();
+        for (int i = 0; i < program.basicBlockCount(); ++i) {
+            outgoings.add(new ArrayList<Incoming>());
+        }
+        for (int i = 0; i < program.basicBlockCount(); ++i) {
+            for (Phi phi : program.basicBlockAt(i).getPhis()) {
+                for (Incoming incoming : phi.getIncomings()) {
+                    outgoings.get(incoming.getSource().getIndex()).add(incoming);
+                }
+            }
+        }
+        return outgoings;
+    }
+
     private void bind(int var, String value) {
         KnownValue known = knownValues.get(value);
         if (known != null && domTree.dominates(known.location, currentBlockIndex)) {
@@ -166,16 +183,19 @@ public class CommonSubexpressionElimination implements MethodOptimization {
             int b = map[insn.getSecondOperand().getIndex()];
             insn.setFirstOperand(program.variableAt(a));
             insn.setSecondOperand(program.variableAt(b));
+            boolean commutative = false;
             String value;
             switch (insn.getOperation()) {
                 case ADD:
                     value = "+";
+                    commutative = true;
                     break;
                 case SUBTRACT:
                     value = "-";
                     break;
                 case MULTIPLY:
                     value = "*";
+                    commutative = true;
                     break;
                 case DIVIDE:
                     value = "/";
@@ -188,12 +208,15 @@ public class CommonSubexpressionElimination implements MethodOptimization {
                     break;
                 case AND:
                     value = "&";
+                    commutative = true;
                     break;
                 case OR:
                     value = "|";
+                    commutative = true;
                     break;
                 case XOR:
                     value = "^";
+                    commutative = true;
                     break;
                 case SHIFT_LEFT:
                     value = "<<";
@@ -207,8 +230,10 @@ public class CommonSubexpressionElimination implements MethodOptimization {
                 default:
                     return;
             }
-            value = "@" + a + value + "@" + b;
-            bind(insn.getReceiver().getIndex(), value);
+            bind(insn.getReceiver().getIndex(), "@" + a + value + "@" + b);
+            if (commutative) {
+                bind(insn.getReceiver().getIndex(), "@" + b + value + "@" + a);
+            }
         }
 
         @Override