diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 488f77a..6cb106c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -12,7 +12,10 @@ add_library(compiler
         pass/onnx_combine.cpp
         pass/onnx_rewrite.cpp
         pass/onnx_decompose.cpp
-        pass/passes.hpp)
+        pass/passes.hpp
+        dialect/onnx/const_operands_interface.hpp
+        dialect/onnx/attribute_promotion.cpp
+        )
 
 # Include root src directory.
 target_include_directories(compiler PRIVATE ${ONNF_SRC_ROOT})
@@ -47,12 +50,18 @@ onnf_tablegen(onnx_rewrite.inc -gen-rewriters)
 add_public_tablegen_target(gen_onnx_rewrite)
 add_dependencies(compiler gen_onnx_rewrite)
 
+add_subdirectory(dialect/onnx)
+
 set(LLVM_TARGET_DEFINITIONS dialect/onnx/onnx.td)
 onnf_tablegen(onnx.hpp.inc -gen-op-decls "-I${CMAKE_SOURCE_DIR}/compiler/pass")
 onnf_tablegen(onnx.cpp.inc -gen-op-defs "-I${CMAKE_SOURCE_DIR}/compiler/pass")
 set(GEN_DOC_FILE ${CMAKE_BINARY_DIR}/docs/Dialects/onnx.md)
 add_public_tablegen_target(gen_onnx)
+
+add_dependencies(gen_onnx gen_shape_inference)
+add_dependencies(gen_onnx gen_const_operands_interface)
 add_dependencies(compiler gen_onnx)
+
 add_onnf_dialect_doc(onnx dialect/onnx/onnx.td)
 
 set(LLVM_TARGET_DEFINITIONS dialect/krnl/krnl_ops.td)
@@ -66,7 +75,7 @@ target_include_directories(onnf_onnx_decompose
         PRIVATE ${ONNF_SRC_ROOT} ${ONNF_BIN_ROOT}
         ${ONNF_SRC_ROOT})
 target_link_libraries(onnf_onnx_decompose ${MLIRLibs})
-add_dependencies(onnf_onnx_decompose gen_krnl_ops)
+add_dependencies(onnf_onnx_decompose gen_onnx)
 
 add_library(onnf_shape_inference pass/shape_inference_pass.cpp)
 target_include_directories(onnf_shape_inference
diff --git a/src/dialect/onnx/CMakeLists.txt b/src/dialect/onnx/CMakeLists.txt
new file mode 100644
index 0000000..0eda4b6
--- /dev/null
+++ b/src/dialect/onnx/CMakeLists.txt
@@ -0,0 +1,11 @@
+#add_library(onnf_fold_const_operand_to_attribute fold_const_operand_to_attribute.hpp)
+#target_include_directories(onnf_fold_const_operand_to_attribute
+#        PRIVATE ${ONNF_SRC_ROOT} ${ONNF_BIN_ROOT})
+#target_link_libraries(onnf_fold_const_operand_to_attribute ${MLIRLibs})
+
+set(LLVM_TARGET_DEFINITIONS const_operands_interface.td)
+onnf_tablegen(const_operands_interface.hpp.inc -gen-op-interface-decls)
+onnf_tablegen(const_operands_interface.cpp.inc -gen-op-interface-defs)
+message("TBLGENOUT" ${TABLEGEN_OUTPUT})
+add_public_tablegen_target(gen_const_operands_interface)
+add_dependencies(compiler gen_const_operands_interface)
\ No newline at end of file
diff --git a/src/dialect/onnx/attribute_promotion.cpp b/src/dialect/onnx/attribute_promotion.cpp
new file mode 100644
index 0000000..b076dfe
--- /dev/null
+++ b/src/dialect/onnx/attribute_promotion.cpp
@@ -0,0 +1,79 @@
+//===----- shape_inference_pass.cpp - Shape Inference ---------------------===//
+//
+// Copyright 2019 The IBM Research Authors.
+//
+// =============================================================================
+//
+// This file implements a Function level pass performing propagation of array
+// shapes through function specialization.
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/Pass/Pass.h"
+#include "llvm/Support/raw_ostream.h"
+
+#include "src/dialect/onnx/const_operands_interface.hpp"
+#include "src/dialect/onnx/onnx_ops.hpp"
+#include "src/pass/passes.hpp"
+
+using namespace mlir;
+
+#include "src/dialect/onnx/const_operands_interface.cpp.inc"
+
+namespace {
+/*!
+ *  FunctionPass that performs shape inference by iterating over a list of
+ *  candidate operations and propagating the shape information until the list
+ *  of operations is empty [credit MLIR authors].
+ */
+class AttributePromotionPass
+    : public mlir::FunctionPass<AttributePromotionPass> {
+public:
+  void runOnFunction() override {
+    auto f = getFunction();
+
+    llvm::Optional<mlir::Value> none;
+    f.walk([&](mlir::Operation *op) {
+      if (op->getNumResults() && op->getOpResult(0).getType().isa<NoneType>())
+        none = op->getOpResult(0);
+    });
+
+    if (!none) {
+      OpBuilder builder(f.getContext());
+      builder.setInsertionPointToStart(&f.front());
+      none =
+          builder.create<mlir::ConstantOp>(f.getLoc(), builder.getUnitAttr());
+    }
+
+    // Iterate on the operations that need shape inference i.e the operations
+    // that return a dynamic shape.
+    f.walk([&](mlir::Operation *op) {
+      if (IdentifyConstOperandsOpInterface opWithConstOperand =
+              dyn_cast<IdentifyConstOperandsOpInterface>(op)) {
+        auto promotableOperands = opWithConstOperand.identifyPromotableConstOperands();
+        for (const auto& operandNameToIdx : promotableOperands) {
+          auto name = operandNameToIdx.first;
+          auto idx = operandNameToIdx.second;
+
+          auto operandToPromote = op->getOperand(idx);
+          if (auto constantOp =
+                  dyn_cast_or_null<ConstantOp>(operandToPromote.getDefiningOp())) {
+            op->setAttr(name, constantOp.value());
+            op->setOperand(idx, *none);
+          }
+        }
+      }
+    });
+  }
+};
+} // end anonymous namespace
+
+/*!
+ * Create a Shape Inference pass.
+ */
+std::unique_ptr<mlir::Pass> mlir::createAttributePromotionPass() {
+  return std::make_unique<AttributePromotionPass>();
+}
+
+static PassRegistration<AttributePromotionPass> pass(
+    "attribute-promotion", "Shape inference for frontend dialects.");
diff --git a/src/dialect/onnx/const_operands_interface.hpp b/src/dialect/onnx/const_operands_interface.hpp
new file mode 100644
index 0000000..66c01f0
--- /dev/null
+++ b/src/dialect/onnx/const_operands_interface.hpp
@@ -0,0 +1,24 @@
+//===- shape_inference_interface.hpp - Definition for ShapeInference --------=//
+//
+// Copyright 2019 The IBM Research Authors.
+//
+// =============================================================================
+//
+// This file contains the declarations of the shape inference interfaces defined
+// in ShapeInferenceInterface.td.
+//
+//===----------------------------------------------------------------------===//
+
+#pragma once
+
+#include <map>
+#include <string>
+
+#include "mlir/IR/OpDefinition.h"
+
+namespace mlir {
+
+/// Include the auto-generated declarations.
+#include "src/dialect/onnx/const_operands_interface.hpp.inc"
+
+}  // end namespace mlir
\ No newline at end of file
diff --git a/src/dialect/onnx/const_operands_interface.td b/src/dialect/onnx/const_operands_interface.td
new file mode 100644
index 0000000..080ee7f
--- /dev/null
+++ b/src/dialect/onnx/const_operands_interface.td
@@ -0,0 +1,32 @@
+//=- shape_inference_interface.td - Shape Inference Interface -*- tablegen -==//
+//
+// Copyright 2019 The IBM Research Authors.
+//
+// =============================================================================
+//
+// Defines the operations of the Shape Inference Op Interface.
+//
+//===----------------------------------------------------------------------===//
+
+#ifdef IDENTIFY_PROMOTABLE_CONST_OPERANDS_OP_INTERFACE
+#else
+#define IDENTIFY_PROMOTABLE_CONST_OPERANDS_OP_INTERFACE
+
+#ifdef OP_BASE
+#else
+include "mlir/IR/OpBase.td"
+#endif // OP_BASE
+
+def IdentifyConstOperandsOpInterface : OpInterface<"IdentifyConstOperandsOpInterface"> {
+  let description = [{
+    Interface to access a registered method to infer the return types for an
+    operation that can be used during type inference.
+  }];
+
+  let methods = [
+    InterfaceMethod<"Infer and set the output shape for the current operation.",
+                    "std::map<std::string, size_t>", "identifyPromotableConstOperands">
+  ];
+}
+
+#endif // IDENTIFY_PROMOTABLE_CONST_OPERANDS_OP_INTERFACE
diff --git a/src/dialect/onnx/onnx.td b/src/dialect/onnx/onnx.td
index 68dbbf6..09acf6c 100644
--- a/src/dialect/onnx/onnx.td
+++ b/src/dialect/onnx/onnx.td
@@ -22,6 +22,11 @@ include "mlir/IR/OpBase.td"
 include "pass/shape_inference_interface.td"
 #endif // SHAPE_INFERENCE_INTERFACE
 
+#ifdef IDENTIFY_PROMOTABLE_CONST_OPERANDS_OP_INTERFACE
+#else
+include "dialect/onnx/const_operands_interface.td"
+#endif // IDENTIFY_PROMOTABLE_CONST_OPERANDS_OP_INTERFACE
+
 def ONNX_Dialect : Dialect {
   let name = "onnx";
   let cppNamespace = "";
diff --git a/src/dialect/onnx/onnx_ops.hpp b/src/dialect/onnx/onnx_ops.hpp
index 1ba9669..ab4ca65 100644
--- a/src/dialect/onnx/onnx_ops.hpp
+++ b/src/dialect/onnx/onnx_ops.hpp
@@ -10,6 +10,9 @@
 
 #pragma once
 
+#include <map>
+#include <string>
+
 #include "mlir/Dialect/StandardOps/Ops.h"
 #include "mlir/IR/Builders.h"
 #include "mlir/IR/Dialect.h"
@@ -17,6 +20,7 @@
 #include "mlir/IR/StandardTypes.h"
 
 #include "src/pass/shape_inference_interface.hpp"
+#include "src/dialect/onnx/const_operands_interface.hpp"
 
 namespace mlir {
 
diff --git a/src/dialect/onnx/onnxop.inc b/src/dialect/onnx/onnxop.inc
index c64e1e6..9091556 100644
--- a/src/dialect/onnx/onnxop.inc
+++ b/src/dialect/onnx/onnxop.inc
@@ -26,7 +26,7 @@ def ONNXAbsOp:ONNX_Op<"Abs",
       outputTypes.emplace_back(UnrankedTensorType::get(elementType));
       build(builder, state, outputTypes, operands, attributes);
     }]>
-    ];
+  ];
 }
 
 def ONNXAcosOp:ONNX_Op<"Acos",
@@ -2501,7 +2501,9 @@ def ONNXReluOp:ONNX_Op<"Relu",
 }
 
 def ONNXReshapeOp:ONNX_Op<"Reshape",
-  [NoSideEffect, DeclareOpInterfaceMethods<ShapeInferenceOpInterface>]> {
+  [NoSideEffect,
+   DeclareOpInterfaceMethods<ShapeInferenceOpInterface>,
+   OpInterface<"IdentifyConstOperandsOpInterface">]> {
   let summary = "ONNX Reshape operation";
   let description = [{
   "Reshape the input tensor similar to numpy.reshape."
@@ -2512,8 +2514,11 @@ def ONNXReshapeOp:ONNX_Op<"Reshape",
   "from the input tensor)."
   }];
   let arguments = (ins AnyTypeOf<[AnyMemRef, AnyTensor]>:$data,
-    AnyTypeOf<[AnyMemRef, AnyTensor]>:$shape);
+    AnyTypeOf<[AnyMemRef, AnyTensor, NoneType]>:$shape);
   let results = (outs AnyTypeOf<[AnyMemRef, AnyTensor]>:$reshaped);
+  let extraClassDeclaration = [{
+    std::map<std::string, size_t> identifyPromotableConstOperands() { return {{"shape", 1}}; }
+  }];
 }
 
 def ONNXResizeOp:ONNX_Op<"Resize",
diff --git a/src/main.cpp b/src/main.cpp
index 9500d31..b5f5cf0 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -126,6 +126,7 @@ int main(int argc, char *argv[]) {
   pm.addPass(mlir::createShapeInferencePass());
   pm.addPass(mlir::createCanonicalizerPass());
   pm.addPass(mlir::createShapeInferencePass());
+  pm.addPass(mlir::createAttributePromotionPass());
 
   if (emissionTarget >= EmitMLIR) {
     pm.addPass(mlir::createLowerToKrnlPass());
diff --git a/src/pass/passes.hpp b/src/pass/passes.hpp
index b7bdc96..cbe9961 100644
--- a/src/pass/passes.hpp
+++ b/src/pass/passes.hpp
@@ -20,6 +20,8 @@ std::unique_ptr<Pass> createDecomposeONNXToONNXPass();
 
 std::unique_ptr<Pass> createShapeInferencePass();
 
+std::unique_ptr<Pass> createAttributePromotionPass();
+
 /// Add pass for lowering to Krnl IR.
 std::unique_ptr<Pass> createLowerToKrnlPass();
 
diff --git a/src/pass/shape_inference_pass.cpp b/src/pass/shape_inference_pass.cpp
index 8df3d66..9c3ab85 100644
--- a/src/pass/shape_inference_pass.cpp
+++ b/src/pass/shape_inference_pass.cpp
@@ -12,9 +12,9 @@
 #include "mlir/Pass/Pass.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/Support/raw_ostream.h"
+#include "mlir/IR/StandardTypes.h"
 
 #include "shape_inference_interface.hpp"
-#include "src/dialect/onnx/onnx_ops.hpp"
 
 #include "passes.hpp"