diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/common/OptimizationBasicInterpreter.java b/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/common/OptimizationBasicInterpreter.java
index 0b6f77703d6..1b8569d2e9e 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/common/OptimizationBasicInterpreter.java
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/common/OptimizationBasicInterpreter.java
@@ -18,16 +18,24 @@ package org.jetbrains.kotlin.codegen.optimization.common;
 
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.org.objectweb.asm.Handle;
 import org.jetbrains.org.objectweb.asm.Opcodes;
 import org.jetbrains.org.objectweb.asm.Type;
-import org.jetbrains.org.objectweb.asm.tree.AbstractInsnNode;
+import org.jetbrains.org.objectweb.asm.tree.*;
 import org.jetbrains.org.objectweb.asm.tree.analysis.AnalyzerException;
-import org.jetbrains.org.objectweb.asm.tree.analysis.BasicInterpreter;
 import org.jetbrains.org.objectweb.asm.tree.analysis.BasicValue;
+import org.jetbrains.org.objectweb.asm.tree.analysis.Interpreter;
+
+import java.util.List;
 
 import static org.jetbrains.kotlin.codegen.optimization.common.StrictBasicValue.*;
 
-public class OptimizationBasicInterpreter extends BasicInterpreter {
+public class OptimizationBasicInterpreter extends Interpreter<BasicValue> implements Opcodes {
+
+    public OptimizationBasicInterpreter() {
+        super(ASM5);
+    }
+
     @Override
     @Nullable
     public StrictBasicValue newValue(@Nullable Type type) {
@@ -67,7 +75,78 @@ public class OptimizationBasicInterpreter extends BasicInterpreter {
         if (insn.getOpcode() == Opcodes.ACONST_NULL) {
             return newValue(Type.getObjectType("java/lang/Object"));
         }
-        return super.newOperation(insn);
+
+        switch (insn.getOpcode()) {
+            case ACONST_NULL:
+                return newValue(Type.getObjectType("null"));
+            case ICONST_M1:
+            case ICONST_0:
+            case ICONST_1:
+            case ICONST_2:
+            case ICONST_3:
+            case ICONST_4:
+            case ICONST_5:
+                return StrictBasicValue.INT_VALUE;
+            case LCONST_0:
+            case LCONST_1:
+                return StrictBasicValue.LONG_VALUE;
+            case FCONST_0:
+            case FCONST_1:
+            case FCONST_2:
+                return StrictBasicValue.FLOAT_VALUE;
+            case DCONST_0:
+            case DCONST_1:
+                return StrictBasicValue.DOUBLE_VALUE;
+            case BIPUSH:
+            case SIPUSH:
+                return StrictBasicValue.INT_VALUE;
+            case LDC:
+                Object cst = ((LdcInsnNode) insn).cst;
+                if (cst instanceof Integer) {
+                    return StrictBasicValue.INT_VALUE;
+                }
+                else if (cst instanceof Float) {
+                    return StrictBasicValue.FLOAT_VALUE;
+                }
+                else if (cst instanceof Long) {
+                    return StrictBasicValue.LONG_VALUE;
+                }
+                else if (cst instanceof Double) {
+                    return StrictBasicValue.DOUBLE_VALUE;
+                }
+                else if (cst instanceof String) {
+                    return newValue(Type.getObjectType("java/lang/String"));
+                }
+                else if (cst instanceof Type) {
+                    int sort = ((Type) cst).getSort();
+                    if (sort == Type.OBJECT || sort == Type.ARRAY) {
+                        return newValue(Type.getObjectType("java/lang/Class"));
+                    }
+                    else if (sort == Type.METHOD) {
+                        return newValue(Type.getObjectType("java/lang/invoke/MethodType"));
+                    }
+                    else {
+                        throw new IllegalArgumentException("Illegal LDC constant " + cst);
+                    }
+                }
+                else if (cst instanceof Handle) {
+                    return newValue(Type.getObjectType("java/lang/invoke/MethodHandle"));
+                }
+                else {
+                    throw new IllegalArgumentException("Illegal LDC constant " + cst);
+                }
+            case GETSTATIC:
+                return newValue(Type.getType(((FieldInsnNode) insn).desc));
+            case NEW:
+                return newValue(Type.getObjectType(((TypeInsnNode) insn).desc));
+            default:
+                throw new Error("Internal error.");
+        }
+    }
+
+    @Override
+    public BasicValue copyOperation(@NotNull AbstractInsnNode insn, BasicValue value) throws AnalyzerException {
+        return value;
     }
 
     @Override
@@ -79,11 +158,194 @@ public class OptimizationBasicInterpreter extends BasicInterpreter {
         if (insn.getOpcode() == Opcodes.AALOAD) {
             Type arrayType = value1.getType();
             if (arrayType != null && arrayType.getSort() == Type.ARRAY) {
-                return new BasicValue(arrayType.getElementType());
+                return new StrictBasicValue(arrayType.getElementType());
             }
         }
 
-        return super.binaryOperation(insn, value1, value2);
+        switch (insn.getOpcode()) {
+            case IALOAD:
+            case BALOAD:
+            case CALOAD:
+            case SALOAD:
+            case IADD:
+            case ISUB:
+            case IMUL:
+            case IDIV:
+            case IREM:
+            case ISHL:
+            case ISHR:
+            case IUSHR:
+            case IAND:
+            case IOR:
+            case IXOR:
+                return StrictBasicValue.INT_VALUE;
+            case FALOAD:
+            case FADD:
+            case FSUB:
+            case FMUL:
+            case FDIV:
+            case FREM:
+                return StrictBasicValue.FLOAT_VALUE;
+            case LALOAD:
+            case LADD:
+            case LSUB:
+            case LMUL:
+            case LDIV:
+            case LREM:
+            case LSHL:
+            case LSHR:
+            case LUSHR:
+            case LAND:
+            case LOR:
+            case LXOR:
+                return StrictBasicValue.LONG_VALUE;
+            case DALOAD:
+            case DADD:
+            case DSUB:
+            case DMUL:
+            case DDIV:
+            case DREM:
+                return StrictBasicValue.DOUBLE_VALUE;
+            case AALOAD:
+                return StrictBasicValue.REFERENCE_VALUE;
+            case LCMP:
+            case FCMPL:
+            case FCMPG:
+            case DCMPL:
+            case DCMPG:
+                return StrictBasicValue.INT_VALUE;
+            case IF_ICMPEQ:
+            case IF_ICMPNE:
+            case IF_ICMPLT:
+            case IF_ICMPGE:
+            case IF_ICMPGT:
+            case IF_ICMPLE:
+            case IF_ACMPEQ:
+            case IF_ACMPNE:
+            case PUTFIELD:
+                return null;
+            default:
+                throw new Error("Internal error.");
+        }
+    }
+
+    @Override
+    public BasicValue ternaryOperation(
+            AbstractInsnNode insn, BasicValue value1, BasicValue value2, BasicValue value3
+    ) throws AnalyzerException {
+        return null;
+    }
+
+    @Override
+    public BasicValue naryOperation(
+            AbstractInsnNode insn, List<? extends BasicValue> values
+    ) throws AnalyzerException {
+        int opcode = insn.getOpcode();
+        if (opcode == MULTIANEWARRAY) {
+            return newValue(Type.getType(((MultiANewArrayInsnNode) insn).desc));
+        }
+        else if (opcode == INVOKEDYNAMIC) {
+            return newValue(Type.getReturnType(((InvokeDynamicInsnNode) insn).desc));
+        }
+        else {
+            return newValue(Type.getReturnType(((MethodInsnNode) insn).desc));
+        }
+    }
+
+    @Override
+    public void returnOperation(
+            AbstractInsnNode insn, BasicValue value, BasicValue expected
+    ) throws AnalyzerException {
+    }
+
+    @Override
+    public BasicValue unaryOperation(
+            AbstractInsnNode insn,
+            BasicValue value
+    ) throws AnalyzerException {
+        switch (insn.getOpcode()) {
+            case INEG:
+            case IINC:
+            case L2I:
+            case F2I:
+            case D2I:
+            case I2B:
+            case I2C:
+            case I2S:
+                return StrictBasicValue.INT_VALUE;
+            case FNEG:
+            case I2F:
+            case L2F:
+            case D2F:
+                return StrictBasicValue.FLOAT_VALUE;
+            case LNEG:
+            case I2L:
+            case F2L:
+            case D2L:
+                return StrictBasicValue.LONG_VALUE;
+            case DNEG:
+            case I2D:
+            case L2D:
+            case F2D:
+                return StrictBasicValue.DOUBLE_VALUE;
+            case IFEQ:
+            case IFNE:
+            case IFLT:
+            case IFGE:
+            case IFGT:
+            case IFLE:
+            case TABLESWITCH:
+            case LOOKUPSWITCH:
+            case IRETURN:
+            case LRETURN:
+            case FRETURN:
+            case DRETURN:
+            case ARETURN:
+            case PUTSTATIC:
+                return null;
+            case GETFIELD:
+                return newValue(Type.getType(((FieldInsnNode) insn).desc));
+            case NEWARRAY:
+                switch (((IntInsnNode) insn).operand) {
+                    case T_BOOLEAN:
+                        return newValue(Type.getType("[Z"));
+                    case T_CHAR:
+                        return newValue(Type.getType("[C"));
+                    case T_BYTE:
+                        return newValue(Type.getType("[B"));
+                    case T_SHORT:
+                        return newValue(Type.getType("[S"));
+                    case T_INT:
+                        return newValue(Type.getType("[I"));
+                    case T_FLOAT:
+                        return newValue(Type.getType("[F"));
+                    case T_DOUBLE:
+                        return newValue(Type.getType("[D"));
+                    case T_LONG:
+                        return newValue(Type.getType("[J"));
+                    default:
+                        throw new AnalyzerException(insn, "Invalid array type");
+                }
+            case ANEWARRAY:
+                String desc = ((TypeInsnNode) insn).desc;
+                return newValue(Type.getType("[" + Type.getObjectType(desc)));
+            case ARRAYLENGTH:
+                return StrictBasicValue.INT_VALUE;
+            case ATHROW:
+                return null;
+            case CHECKCAST:
+                desc = ((TypeInsnNode) insn).desc;
+                return newValue(Type.getObjectType(desc));
+            case INSTANCEOF:
+                return StrictBasicValue.INT_VALUE;
+            case MONITORENTER:
+            case MONITOREXIT:
+            case IFNULL:
+            case IFNONNULL:
+                return null;
+            default:
+                throw new Error("Internal error.");
+        }
     }
 
     @NotNull
diff --git a/compiler/testData/codegen/box/regressions/kt14447.kt b/compiler/testData/codegen/box/regressions/kt14447.kt
new file mode 100644
index 00000000000..7aab4c5003b
--- /dev/null
+++ b/compiler/testData/codegen/box/regressions/kt14447.kt
@@ -0,0 +1,22 @@
+class ImpulsMigration
+{
+    fun migrate(oldVersion: Long)
+    {
+        var _oldVersion = oldVersion
+
+        if (4 > 3)
+        {
+            _oldVersion = 1
+        }
+
+        if (1 > 3)
+        {
+            _oldVersion++
+        }
+    }
+}
+
+fun box(): String {
+    ImpulsMigration().migrate(1L)
+    return "OK"
+}
diff --git a/compiler/tests-ir-jvm/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java b/compiler/tests-ir-jvm/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java
index f90a01c9ca3..74363bd5e89 100644
--- a/compiler/tests-ir-jvm/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java
+++ b/compiler/tests-ir-jvm/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java
@@ -13900,6 +13900,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             doTest(fileName);
         }
 
+        @TestMetadata("kt14447.kt")
+        public void testKt14447() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/regressions/kt14447.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("kt1515.kt")
         public void testKt1515() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/regressions/kt1515.kt");
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java
index e7a70fc5956..787fdade409 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java
@@ -13900,6 +13900,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
 
+        @TestMetadata("kt14447.kt")
+        public void testKt14447() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/regressions/kt14447.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("kt1515.kt")
         public void testKt1515() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/regressions/kt1515.kt");