diff --git a/MLIR.cmake b/MLIR.cmake
index a01cbb0..af9c75e 100644
--- a/MLIR.cmake
+++ b/MLIR.cmake
@@ -67,10 +67,10 @@ find_mlir_lib(MLIRStandardOps)
 find_mlir_lib(MLIRStandardToLLVM)
 find_mlir_lib(MLIRTargetLLVMIR)
 find_mlir_lib(MLIRTransforms)
-find_mlir_lib(MLIRTransforms)
 find_mlir_lib(MLIRTransformUtils)
 find_mlir_lib(MLIRSupport)
 find_mlir_lib(MLIROptMain)
+find_mlir_lib(MLIRVectorOps)
 
 find_mlir_lib(LLVMCore)
 find_mlir_lib(LLVMSupport)
@@ -132,7 +132,9 @@ set(MLIRWholeArchiveLibs
         MLIRLLVMIR
         MLIRStandardOps
         MLIRStandardToLLVM
-        MLIRLoopToStandard)
+        MLIRTransforms
+        MLIRLoopToStandard
+        MLIRVectorOps)
 
 function(whole_archive_link target lib_dir)
   get_property(link_flags TARGET ${target} PROPERTY LINK_FLAGS)
diff --git a/src/compiler/CMakeLists.txt b/src/compiler/CMakeLists.txt
index 91dc4e0..480e2e0 100644
--- a/src/compiler/CMakeLists.txt
+++ b/src/compiler/CMakeLists.txt
@@ -45,8 +45,6 @@ target_link_libraries(compiler
         ${MLIRLibs}
         curses)
 
-add_subdirectory(tool)
-
 set(LLVM_TARGET_DEFINITIONS pass/shape_inference_interface.td)
 onnf_tablegen(shape_inference.hpp.inc -gen-op-interface-decls)
 onnf_tablegen(shape_inference.cpp.inc -gen-op-interface-defs)
@@ -69,4 +67,19 @@ onnf_tablegen(krnl.hpp.inc -gen-op-decls)
 onnf_tablegen(krnl.cpp.inc -gen-op-defs)
 add_public_tablegen_target(gen_krnl_ops)
 add_dependencies(compiler gen_krnl_ops)
-add_dependencies(onnf-opt gen_krnl_ops)
+
+add_library(onnf_shape_inference pass/shape_inference_pass.cpp)
+target_include_directories(onnf_shape_inference
+                           PRIVATE ${ONNF_SRC_ROOT} ${ONNF_BIN_ROOT}
+                                   ${ONNF_SRC_ROOT})
+target_link_libraries(onnf_shape_inference ${MLIRLibs})
+add_dependencies(onnf_shape_inference gen_krnl_ops)
+
+add_library(onnf_lower_frontend pass/lower_frontend_to_krnl.cpp)
+target_include_directories(onnf_lower_frontend
+                           PRIVATE ${ONNF_SRC_ROOT} ${ONNF_BIN_ROOT}
+                                   ${ONNF_SRC_ROOT})
+target_link_libraries(onnf_lower_frontend ${MLIRLibs})
+add_dependencies(onnf_lower_frontend gen_krnl_ops)
+
+add_subdirectory(tool)
diff --git a/src/compiler/pass/lower_frontend_to_krnl.cpp b/src/compiler/pass/lower_frontend_to_krnl.cpp
index 78097c1..7401037 100644
--- a/src/compiler/pass/lower_frontend_to_krnl.cpp
+++ b/src/compiler/pass/lower_frontend_to_krnl.cpp
@@ -280,3 +280,6 @@ void FrontendToKrnlLoweringPass::runOnModule() {
 std::unique_ptr<Pass> mlir::createLowerToKrnlPass() {
   return std::make_unique<FrontendToKrnlLoweringPass>();
 }
+
+static PassRegistration<FrontendToKrnlLoweringPass> pass(
+     "lower-frontend", "Lower frontend ops to Krnl dialect.");
diff --git a/src/compiler/pass/passes.hpp b/src/compiler/pass/passes.hpp
index ee10dd0..a268021 100644
--- a/src/compiler/pass/passes.hpp
+++ b/src/compiler/pass/passes.hpp
@@ -17,7 +17,7 @@ class Pass;
 
 std::unique_ptr<Pass> createShapeInferencePass();
 
-/// Add pass for lowering to Krnl IR.
+/// Pass for lowering frontend dialects to Krnl IR dialect.
 std::unique_ptr<mlir::Pass> createLowerToKrnlPass();
 
 // TODO: Add pass for lowering to LLVM IR.
diff --git a/src/compiler/pass/shape_inference_pass.cpp b/src/compiler/pass/shape_inference_pass.cpp
index 94e5389..fc3ed1f 100644
--- a/src/compiler/pass/shape_inference_pass.cpp
+++ b/src/compiler/pass/shape_inference_pass.cpp
@@ -105,3 +105,6 @@ class ShapeInferencePass : public mlir::FunctionPass<ShapeInferencePass> {
 std::unique_ptr<mlir::Pass> mlir::createShapeInferencePass() {
   return std::make_unique<ShapeInferencePass>();
 }
+
+static PassRegistration<ShapeInferencePass> pass(
+     "shape-inference", "Shape inference for frontend dialects.");
diff --git a/src/compiler/tool/onnf_opt/CMakeLists.txt b/src/compiler/tool/onnf_opt/CMakeLists.txt
index 3ec11da..669e999 100644
--- a/src/compiler/tool/onnf_opt/CMakeLists.txt
+++ b/src/compiler/tool/onnf_opt/CMakeLists.txt
@@ -1,10 +1,13 @@
 add_executable(onnf-opt onnf_opt.cpp)
+add_dependencies(onnf-opt gen_krnl_ops)
 
 target_include_directories(onnf-opt PRIVATE ${ONNF_SRC_ROOT})
 target_include_directories(onnf-opt PRIVATE ${ONNF_BIN_ROOT})
 
 target_link_libraries(onnf-opt compiler ${MLIRLibs})
 whole_archive_link_mlir(onnf-opt ${MLIRWholeArchiveLibs})
+whole_archive_link_onnf(onnf-opt onnf_lower_frontend)
+whole_archive_link_onnf(onnf-opt onnf_shape_inference)
 
 # TODO: need to investigate how to whole-archive link compiler pass to onnf-opt.
 target_link_libraries(onnf-opt compiler)
diff --git a/test/mlir/onnx/onnx_lowering.mlir b/test/mlir/onnx/onnx_lowering.mlir
new file mode 100644
index 0000000..9edbf58
--- /dev/null
+++ b/test/mlir/onnx/onnx_lowering.mlir
@@ -0,0 +1,23 @@
+// RUN: onnf-opt --shape-inference --lower-frontend %s -split-input-file | FileCheck %s
+
+module {
+  func @test_sigmoid(%a1 : tensor<?x10xf32>, %a2 : tensor<?x10xf32>) -> tensor<*xf32> {
+    %0 = "onnx.Add"(%a1, %a2) : (tensor<?x10xf32>, tensor<?x10xf32>) -> tensor<*xf32>
+    "std.return"(%0) : (tensor<*xf32>) -> ()
+  }
+}
+
+// CHECK: func @test_sigmoid([[ARG0:%.+]]: memref<?x10xf32>, [[ARG1:%.+]]: memref<?x10xf32>) -> memref<?x10xf32> {
+// CHECK: [[DIM_0:%.+]] = dim [[ARG0]], 0 : memref<?x10xf32>
+// CHECK: [[RES:%.+]] = alloc([[DIM_0]]) : memref<?x10xf32>
+// CHECK: [[DEF_LOOPS:%.+]]:2 = krnl.define_loops 2
+// CHECK: [[OPT_LOOPS:%.+]]:2 = krnl.optimize_loops  {
+// CHECK:   krnl.return_loops [[DEF_LOOPS]]#0, [[DEF_LOOPS]]#1
+// CHECK: } : () -> (!krnl.loop, !krnl.loop)
+// CHECK: [[DIM_2:%.+]] = dim [[ARG0]], 0 : memref<?x10xf32>
+// CHECK: krnl.iterate([[OPT_LOOPS]]#0, [[OPT_LOOPS]]#1) with ([[DEF_LOOPS]]#0 -> %arg2 = 0 to [[DIM_2]], [[DEF_LOOPS]]#1 -> %arg3 = 0 to 10) {
+// CHECK: [[LOAD1:%.+]] = load [[ARG0]][%arg2, %arg3] : memref<?x10xf32>
+// CHECK: [[LOAD2:%.+]] = load [[ARG1]][%arg2, %arg3] : memref<?x10xf32>
+// CHECK: [[ADDF:%.+]] = addf [[LOAD1]], [[LOAD2]] : f32
+// CHECK: store [[ADDF]], [[RES]][%arg2, %arg3] : memref<?x10xf32>
+// CHECK: return [[RES]] : memref<?x10xf32>