diff --git a/src/klotski/CMakeLists.txt b/src/klotski/CMakeLists.txt
index 37406bc..6605b0b 100644
--- a/src/klotski/CMakeLists.txt
+++ b/src/klotski/CMakeLists.txt
@@ -29,7 +29,7 @@ add_subdirectory(fast_cal)
 ################################################
 
 #add_library(klotski STATIC klotski_ffi.cc)
-add_library(klotski SHARED ffi/klotski_ffi.cc)
+add_library(klotski SHARED ffi/klotski_ffi.cc ffi/tmain.cc)
 
 ################################################
 
diff --git a/src/klotski/ffi/klotski.h b/src/klotski/ffi/klotski.h
index 22dc2f6..8de902b 100644
--- a/src/klotski/ffi/klotski.h
+++ b/src/klotski/ffi/klotski.h
@@ -1,4 +1,12 @@
 #pragma once
 
-void short_code_speed_up_fast();
-void short_code_speed_up_normal();
+extern "C" {
+    void _tmain();
+}
+
+extern "C" {
+
+    void short_code_speed_up();
+    void short_code_speed_up_fast();
+
+}
diff --git a/src/klotski/ffi/klotski_ffi.cc b/src/klotski/ffi/klotski_ffi.cc
index 4b4c2f0..a57dbb9 100644
--- a/src/klotski/ffi/klotski_ffi.cc
+++ b/src/klotski/ffi/klotski_ffi.cc
@@ -2,10 +2,10 @@
 
 #include "short_code.h"
 
-void short_code_speed_up_fast() {
-    ShortCode::speed_up(ShortCode::FAST);
+void short_code_speed_up() {
+    ShortCode::speed_up(ShortCode::NORMAL);
 }
 
-void short_code_speed_up_normal() {
-    ShortCode::speed_up(ShortCode::NORMAL);
+void short_code_speed_up_fast() {
+    ShortCode::speed_up(ShortCode::FAST);
 }
diff --git a/src/klotski/ffi/tmain.cc b/src/klotski/ffi/tmain.cc
new file mode 100644
index 0000000..a400622
--- /dev/null
+++ b/src/klotski/ffi/tmain.cc
@@ -0,0 +1,19 @@
+#include <iostream>
+#include "klotski.h"
+
+#include "core.h"
+
+void _tmain() {
+//    std::cout << "test" << std::endl;
+
+    uint64_t raw_code = 0x0603EDF5CAFFF5E2;
+
+    auto core = Core([](uint64_t code, uint64_t mask) {
+        return;
+    });
+
+    for (uint32_t i = 0; i < 1000000; ++i) {
+        core.next_cases(raw_code, 0);
+    }
+
+}
diff --git a/src/main.cc b/src/main.cc
index f51feb8..1bf658c 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -1,5 +1,7 @@
 #include <iostream>
 
+#include "ffi/klotski.h"
+
 //#include "utils/common.h"
 //#include "all_cases/all_cases.h"
 //
@@ -13,13 +15,13 @@
 
 //#include "graph.h"
 
-#include "benchmark.h"
+//#include "benchmark.h"
 
 //#include <unistd.h>
 
 int main() {
 
-    std::cout << "start test" << std::endl;
+//    std::cout << "start test" << std::endl;
 
 //    std::cout << (uint32_t)Common::check_range(1, Common::range_reverse(0xA9BF0C00)) << std::endl;
 //
@@ -54,9 +56,15 @@ int main() {
 //        std::cout << s << std::endl;
 //    }
 
-    Benchmark::basic_ranges(std::cout);
+//    Benchmark::basic_ranges(std::cout);
+
+    auto start = clock();
+
+    _tmain();
+
+    std::cerr << (clock() - start) * 1000000 / CLOCKS_PER_SEC << "us" << std::endl;
 
-    std::cout << "end test" << std::endl;
+//    std::cout << "end test" << std::endl;
 
 //    BasicRanges::build();