diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/CodeGenerator.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/CodeGenerator.kt
new file mode 100644
index 00000000000..9f55533c3e8
--- /dev/null
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/CodeGenerator.kt
@@ -0,0 +1,67 @@
+package org.jetbrains.kotlin.backend.native.llvm
+
+import llvm.*
+import org.jetbrains.kotlin.descriptors.FunctionDescriptor
+import org.jetbrains.kotlin.ir.declarations.IrFunction
+import org.jetbrains.kotlin.types.KotlinType
+import java.util.*
+
+
+/**
+ *
+ * Created by minamoto on 07/10/2016.
+ */
+
+internal class CodeGenerator(override val context:Context) : ContextUtils {
+    var currentFunction:FunctionDescriptor? = null
+
+    fun function(declaration: IrFunction) {
+        index = 0
+        currentFunction = declaration.descriptor
+        val fn = LLVMAddFunction(context.llvmModule, declaration.descriptor.symbolName, getLlvmFunctionType(declaration.descriptor))
+        val block = LLVMAppendBasicBlock(fn, "entry")
+        LLVMPositionBuilderAtEnd(context.llvmBuilder, block)
+        function2variables.put(declaration.descriptor, mutableMapOf())
+        declaration.descriptor.valueParameters.forEachIndexed { i, descriptor ->
+            val name = descriptor.name.asString()
+            val type = descriptor.type
+            val v = alloca(type, name)
+            store(LLVMGetParam(fn, i)!!, v)
+            currentFunction!!.registerVariable(name, v)
+        }
+
+    }
+
+    fun tmpVariable():String = currentFunction!!.tmpVariable()
+
+    val variablesGlobal = mapOf<String, LLVMOpaqueValue?>()
+    fun variable(varName:String):LLVMOpaqueValue? = currentFunction!!.variable(varName)
+
+    fun FunctionDescriptor.param(num:Int):LLVMOpaqueValue? = LLVMGetParam(llvmFunction.getLlvmValue(), num)
+
+    var index:Int = 0
+    private var FunctionDescriptor.tmpVariableIndex: Int
+        get() = index
+        set(i:Int){ index = i}
+
+    fun FunctionDescriptor.tmpVariable():String = "tmp${tmpVariableIndex++}"
+
+    fun registerVariable(varName: String, value:LLVMOpaqueValue) = currentFunction!!.registerVariable(varName, value)
+
+    val function2variables = mutableMapOf<FunctionDescriptor, MutableMap<String, LLVMOpaqueValue?>>()
+
+
+    val FunctionDescriptor.variables: MutableMap<String, LLVMOpaqueValue?>
+        get() = this@CodeGenerator.function2variables[this]!!
+
+
+    fun FunctionDescriptor.registerVariable(varName: String, value:LLVMOpaqueValue?) = variables.put(varName, value)
+    private fun FunctionDescriptor.variable(varName: String): LLVMOpaqueValue? = variables[varName]
+
+    fun plus(arg0:LLVMOpaqueValue, arg1:LLVMOpaqueValue, result:String):LLVMOpaqueValue = LLVMBuildAdd(context.llvmBuilder, arg0, arg1, result)!!
+    fun alloca(type: KotlinType, varName: String):LLVMOpaqueValue = LLVMBuildAlloca(context.llvmBuilder, getLLVMType(type), varName)!!
+    fun load(value:LLVMOpaqueValue, varName: String):LLVMOpaqueValue = LLVMBuildLoad(context.llvmBuilder, value, varName)!!
+    fun store(value:LLVMOpaqueValue, ptr:LLVMOpaqueValue):LLVMOpaqueValue = LLVMBuildStore(context.llvmBuilder, value, ptr)!!
+}
+
+
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/IrToBitcode.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/IrToBitcode.kt
index f3dd316e968..7fc5e0448d1 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/IrToBitcode.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/IrToBitcode.kt
@@ -3,7 +3,10 @@ package org.jetbrains.kotlin.backend.native.llvm
 import llvm.*
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.declarations.IrClass
+import org.jetbrains.kotlin.ir.declarations.IrFunction
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
+import org.jetbrains.kotlin.ir.declarations.IrVariable
+import org.jetbrains.kotlin.ir.expressions.*
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 
@@ -16,6 +19,7 @@ fun emitLLVM(module: IrModuleFragment, runtimeFile: String, outFile: String) {
     val context = Context(module, runtime, llvmModule) // TODO: dispose
 
     module.accept(RTTIGeneratorVisitor(context), null)
+    module.accept(CodeGeneratorVisitor(context), null)
     LLVMWriteBitcodeToFile(llvmModule, outFile)
 }
 
@@ -31,4 +35,71 @@ internal class RTTIGeneratorVisitor(context: Context) : IrElementVisitorVoid {
         generator.generate(declaration.descriptor)
     }
 
-}
\ No newline at end of file
+}
+
+/**
+ * TODO: split CodeGeneratorVisitor on Visitor and Generator :)
+ */
+internal class CodeGeneratorVisitor(val context: Context) : IrElementVisitorVoid {
+    val generator = CodeGenerator(context)
+    override fun visitFunction(declaration: IrFunction) {
+        generator.function(declaration)
+        declaration.acceptChildrenVoid(this)
+    }
+
+    override fun visitElement(element: IrElement) {
+        element.acceptChildrenVoid(this)
+    }
+
+    override fun visitSetVariable(expression: IrSetVariable) {
+        val value = evaluateExpression(generator.tmpVariable(), expression.value)
+        generator.store(value!!, generator.variable(expression.descriptor.name.asString())!!)
+    }
+
+    private fun evaluateExpression(tmpVariableName: String, value: IrExpression?): LLVMOpaqueValue? {
+        when (value) {
+            is IrCall -> return evaluateCall(tmpVariableName, value)
+            is IrGetValue -> return generator.load(generator.variable(value.descriptor.name.asString())!!, tmpVariableName)
+            null -> return null
+            else -> {
+                TODO()
+            }
+        }
+    }
+
+    private fun evaluateCall(tmpVariableName: String, value: IrCall?): LLVMOpaqueValue? {
+        /* TODO: should we count on receiver?
+         * val tmp = tmpVar()
+         * val lhs = evaluateExpression(tmp, value.dispatchReceiver!!)
+         */
+        val args = mutableListOf<LLVMOpaqueValue?>()
+        value!!.acceptChildrenVoid(object:IrElementVisitorVoid{
+            override fun visitElement(element: IrElement) {
+                val tmp = generator.tmpVariable()
+                args.add(evaluateExpression(tmp, element as IrExpression))
+            }
+        })
+        when (value!!.origin) {
+            IrStatementOrigin.PLUS -> return generator.plus(args[0]!!, args[1]!!, tmpVariableName)
+            else -> {
+                TODO()
+            }
+        }
+        TODO()
+    }
+
+    override fun visitVariable(declaration: IrVariable) {
+        val variableName = declaration.descriptor.name.asString()
+        val variableType = declaration.descriptor.type
+        generator.registerVariable(variableName, generator.alloca(variableType, variableName))
+
+        evaluateExpression(variableName, declaration.initializer)
+    }
+
+    override fun visitReturn(expression: IrReturn) {
+        val tmpVarName = generator.tmpVariable()
+        val value:LLVMOpaqueValue?
+        value = evaluateExpression(tmpVarName, expression.value)
+        LLVMBuildRet(context.llvmBuilder, value)
+    }
+}
diff --git a/backend.native/tests/Makefile b/backend.native/tests/Makefile
new file mode 100644
index 00000000000..33df8c2c53f
--- /dev/null
+++ b/backend.native/tests/Makefile
@@ -0,0 +1,43 @@
+TESTS := sum
+
+BIN_TESTS=$(foreach t, ${TESTS},${t}_test)
+
+VPATH=codegen/function
+
+LLC=llc-mp-3.8
+CC=clang-mp-3.8
+JAVA=java
+
+TOP=../..
+RUNTIME=${TOP}/runtime
+BACKEND=${TOP}/backend.native
+BACKEND_CLASSES=${TOP}/backend.native/build/classes
+KOTLIN_DIST=${BACKEND}/kotlin-ir/dist
+KOTLIN_NATIVE_CLASSPATH=${BACKEND_CLASSES}/bc_frontend:${BACKEND_CLASSES}/cli_bc:${BACKEND_CLASSES}/compiler:${KOTLIN_DIST}/kotlinc/lib/kotlin-reflect.jar:${KOTLIN_DIST}kotlinc/lib/kotlin-stdlib.jar:${KOTLIN_DIST}/kotlinc/lib/kotlin-compiler.jar:${KOTLIN_DIST}/kotlinc/lib/kotlin-runtime.jar:${TOP}/Interop/Runtime/build/classes/main
+
+
+define PROTO
+$(1)_test: main.c $1-test.c $1.S
+	$(CC) -o $$@ $$^
+
+${1}_run:${1}_test
+	./${1}_test
+endef
+
+$(foreach test,${TESTS},$(eval $(call PROTO,$(test))))
+
+all:${BIN_TESTS}
+
+run:$(foreach test,${TESTS},${test}_run)
+
+clean:
+	${RM} *.o *.S *.BCkt ${BIN_TESTS}
+
+
+%.S:%.BCkt
+	${LLC} -o $@ $<
+
+
+%.BCkt:%.kt
+	${JAVA} -cp ${KOTLIN_NATIVE_CLASSPATH} -Djava.library.path=${BACKEND}/build/nativelibs org.jetbrains.kotlin.cli.bc.K2NativeKt -output $@ -runtime ${RUNTIME}/build/runtime.bc $<
+
diff --git a/backend.native/tests/codegen/function/sum-test.c b/backend.native/tests/codegen/function/sum-test.c
new file mode 100644
index 00000000000..2658fe58131
--- /dev/null
+++ b/backend.native/tests/codegen/function/sum-test.c
@@ -0,0 +1,10 @@
+extern void *resolve_symbol(const char*);
+
+int
+run_test() {
+  int (*sum)(int, int) = resolve_symbol("kfun:sum");
+  
+  if (sum(2, 3) != 5) return 1;
+
+  return 0;
+}
diff --git a/backend.native/tests/codegen/function/sum.kt b/backend.native/tests/codegen/function/sum.kt
new file mode 100644
index 00000000000..38215fdce2d
--- /dev/null
+++ b/backend.native/tests/codegen/function/sum.kt
@@ -0,0 +1 @@
+fun sum(a:Int, b:Int) = a + b
\ No newline at end of file
diff --git a/backend.native/tests/codegen/function/sum_func.kt b/backend.native/tests/codegen/function/sum_func.kt
new file mode 100644
index 00000000000..24a5ca9713a
--- /dev/null
+++ b/backend.native/tests/codegen/function/sum_func.kt
@@ -0,0 +1,3 @@
+fun foo():Int = 1
+//fun bar():Int = 2
+//fun sum():Int = foo() + bar()
\ No newline at end of file
diff --git a/backend.native/tests/codegen/function/sum_silly.kt b/backend.native/tests/codegen/function/sum_silly.kt
new file mode 100644
index 00000000000..89087067188
--- /dev/null
+++ b/backend.native/tests/codegen/function/sum_silly.kt
@@ -0,0 +1,5 @@
+fun sum(a:Int, b:Int):Int {
+ var c:Int
+ c = a + b
+ return c
+}
\ No newline at end of file
diff --git a/backend.native/tests/main.c b/backend.native/tests/main.c
new file mode 100644
index 00000000000..e6f0c27defd
--- /dev/null
+++ b/backend.native/tests/main.c
@@ -0,0 +1,19 @@
+#include <dlfcn.h>
+#include <stdio.h>
+/**
+ * > llc-mp-3.8 b.out -o b.S
+ * > /opt/local/libexec/llvm-3.8/bin/clang main.c b.S -o sum-test
+ */
+
+extern int run_test();
+
+void * resolve_symbol(char *name) {
+  /* here we can add here some magic to resolve symbols in kotlin native*/
+  return dlsym(RTLD_SELF, name);
+}
+    
+
+int
+main() {
+  return run_test();
+}
diff --git a/sum.c b/sum.c
new file mode 100644
index 00000000000..a7f7e84f208
--- /dev/null
+++ b/sum.c
@@ -0,0 +1,5 @@
+int foo(int a, int b){
+  int c;
+  c = a + b;
+  return c;
+}
diff --git a/sum_func.c b/sum_func.c
new file mode 100644
index 00000000000..2f7f6f96434
--- /dev/null
+++ b/sum_func.c
@@ -0,0 +1,3 @@
+int foo() { return 1; }
+int bar() {return 2;}
+int sum() {return foo() + bar();}