diff --git a/src/opr/impl/search_policy/profiler.cpp b/src/opr/impl/search_policy/profiler.cpp
index f3befdc2f9391c3e6db89d6e285c61f4d135310d..d2272abe40306db02cf69ae3171846f331d2dd64 100644
--- a/src/opr/impl/search_policy/profiler.cpp
+++ b/src/opr/impl/search_policy/profiler.cpp
@@ -154,6 +154,64 @@ double TimedProfiler<Opr>::init_timeout_setting() {
     mgb::apply([&](const auto&... args) { return statement; }, \
                std::tuple_cat(__VA_ARGS__))
 
+template <typename Opr>
+void TimedProfiler<Opr>::preprocess(const TensorLayoutArray&,
+                                    const megdnn::SmallVector<DeviceTensorND>&,
+                                    intl::UniqPtrWithCN<Opr>&,
+                                    megdnn::Workspace&,
+                                    std::array<TensorLayout, arity>&,
+                                    std::array<DeviceTensorND, arity_in>&,
+                                    PreprocessFilter<Opr>&) {
+    // Opr is neither convbias nor convolution.This function do nothing.
+}
+
+//! convbias
+template <>
+void TimedProfiler<megdnn::ConvBias>::preprocess(
+        const TensorLayoutArray& preprocessed_layout,
+        const SmallVector<DeviceTensorND>& flt_val,
+        intl::UniqPtrWithCN<megdnn::ConvBias>& megdnn_opr,
+        megdnn::Workspace& mdn_workspace,
+        std::array<TensorLayout, arity>& layouts,
+        std::array<DeviceTensorND, arity_in>& inp_val,
+        PreprocessFilter<megdnn::ConvBias>& prep_flt) {
+    if (!preprocessed_layout.empty()) {
+        auto&& pf = prep_flt;
+        pf.algorithm_id = nullptr;
+        pf.tensors.resize(flt_val.size());
+        for (size_t i = 0; i < flt_val.size(); i++) {
+            pf.tensors[i] = flt_val[i].as_megdnn();
+        }
+        APPLY(megdnn_opr->exec_preprocess(args..., &pf, mdn_workspace),
+              std::forward_as_tuple(layouts[0], inp_val[1].as_megdnn(),
+                                    inp_val[2].as_megdnn()),
+              array_skip<arity_in - 1>(layouts));
+    }
+}
+
+//! convolution
+template <>
+void TimedProfiler<megdnn::ConvolutionForward>::preprocess(
+        const TensorLayoutArray& preprocessed_layout,
+        const megdnn::SmallVector<DeviceTensorND>& flt_val,
+        intl::UniqPtrWithCN<megdnn::ConvolutionForward>& megdnn_opr,
+        megdnn::Workspace& mdn_workspace,
+        std::array<TensorLayout, arity>& layouts,
+        std::array<DeviceTensorND, arity_in>& inp_val,
+        PreprocessFilter<megdnn::ConvolutionForward>& prep_flt) {
+    if (!preprocessed_layout.empty()) {
+        auto&& pf = prep_flt;
+        pf.algorithm_id = nullptr;
+        pf.tensors.resize(flt_val.size());
+        for (size_t i = 0; i < flt_val.size(); i++) {
+            pf.tensors[i] = flt_val[i].as_megdnn();
+        }
+        APPLY(megdnn_opr->exec_preprocess(args..., &pf, mdn_workspace),
+              std::forward_as_tuple(layouts[0], inp_val[1].as_megdnn()),
+              array_skip<2>(layouts));
+    }
+}
+
 template <typename Opr>
 typename TimedProfiler<Opr>::TResult TimedProfiler<Opr>::prof_impl(
         const TParam& raw_param) {
@@ -258,36 +316,8 @@ typename TimedProfiler<Opr>::TResult TimedProfiler<Opr>::prof_impl(
     }
 
     PreprocessFilter<Opr> prep_flt;
-    if_constexpr<opr_supports_preprocess<Opr>()>([&](auto _) {
-        if (!preprocessed_layout.empty()) {
-            auto&& pf = _(prep_flt);
-            pf.algorithm_id = nullptr;
-            pf.tensors.resize(flt_val.size());
-            for (size_t i = 0; i < flt_val.size(); i++) {
-                pf.tensors[i] = flt_val[i].as_megdnn();
-            }
-            if_constexpr<opr_contain_bias<Opr>()>(
-                    //! convbias
-                    [&](auto __) {
-                        APPLY(__(megdnn_opr)
-                                      ->exec_preprocess(args..., &pf,
-                                                        mdn_workspace),
-                              std::forward_as_tuple(layouts[0],
-                                                    inp_val[1].as_megdnn(),
-                                                    inp_val[2].as_megdnn()),
-                              array_skip<arity_in - 1>(layouts));
-                    },
-                    //! Convolution
-                    [&](auto __) {
-                        APPLY(__(megdnn_opr)
-                                      ->exec_preprocess(args..., &pf,
-                                                        mdn_workspace),
-                              std::forward_as_tuple(layouts[0],
-                                                    inp_val[1].as_megdnn()),
-                              array_skip<arity_in>(layouts));
-                    });
-        }
-    });
+    preprocess(preprocessed_layout, flt_val, megdnn_opr, mdn_workspace, layouts,
+               inp_val, prep_flt);
 
     RealTimer timer;
     auto ev_start = cn.create_event(CompNode::Event::NEED_TIMER),
diff --git a/src/opr/include/megbrain/opr/search_policy/profiler.h b/src/opr/include/megbrain/opr/search_policy/profiler.h
index 062e58671ee3cb1adf674ac7a4ffe18f31245e8a..d1bf34aa347a55f3dc89cc2c00850349e59be536 100644
--- a/src/opr/include/megbrain/opr/search_policy/profiler.h
+++ b/src/opr/include/megbrain/opr/search_policy/profiler.h
@@ -16,6 +16,8 @@
 #include "megbrain/utils/timer.h"
 #include "megbrain/system.h"
 #include "megbrain/comp_node.h"
+#include "megbrain/tensor.h"
+#include "megbrain/opr/internal/megdnn_opr_wrapper.h"
 
 #include "megdnn/basic_types.h"
 #include "megdnn/oprs.h"
@@ -149,6 +151,13 @@ private:
     static const double timeout_setting;
 
     static double init_timeout_setting();
+    static void preprocess(const megdnn::TensorLayoutArray& preprocessed_layout,
+                           const SmallVector<DeviceTensorND>& flt_val,
+                           intl::UniqPtrWithCN<Opr>& megdnn_opr,
+                           megdnn::Workspace& mdn_workspace,
+                           std::array<TensorLayout, arity>& layouts,
+                           std::array<DeviceTensorND, arity_in>& inp_val,
+                           PreprocessFilter<Opr>& prep_flt);
     static TResult prof_impl(const TParam& raw_param);
     static void prof_init_device(const TParam& raw_param);
 };