diff --git a/include/triton/tools/sha1.hpp b/include/triton/tools/sha1.hpp
index 93b9869c4..630a3fd77 100644
--- a/include/triton/tools/sha1.hpp
+++ b/include/triton/tools/sha1.hpp
@@ -54,7 +54,7 @@ namespace sha1
             }
         }
 
-        void innerHash(unsigned int* result, unsigned int* w)
+        inline void innerHash(unsigned int* result, unsigned int* w)
         {
             unsigned int a = result[0];
             unsigned int b = result[1];
@@ -114,7 +114,7 @@ namespace sha1
         }
     } // namespace
 
-    void calc(const void* src, const int bytelength, unsigned char* hash)
+    inline void calc(const void* src, const int bytelength, unsigned char* hash)
     {
         // Init the result array.
         unsigned int result[5] = { 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0 };
@@ -170,7 +170,7 @@ namespace sha1
         }
     }
 
-    void toHexString(const unsigned char* hash, char* hexstring)
+    inline void toHexString(const unsigned char* hash, char* hexstring)
     {
         const char hexDigits[] = { "0123456789abcdef" };
 
diff --git a/lib/driver/module.cc b/lib/driver/module.cc
index f0035fc84..7c7286d3e 100755
--- a/lib/driver/module.cc
+++ b/lib/driver/module.cc
@@ -26,6 +26,9 @@
 #include "triton/driver/module.h"
 #include "triton/driver/context.h"
 #include "triton/driver/error.h"
+#include "triton/tools/sha1.hpp"
+#include "triton/tools/sys/getenv.hpp"
+#include "triton/tools/sys/mkdir.hpp"
 #include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/Verifier.h"
 #include "llvm/IR/IRPrintingPasses.h"
@@ -346,7 +349,31 @@ cu_module::cu_module(driver::device* device, std::unique_ptr<llvm::Module> ll_mo
   llvm::raw_string_ostream oss(llir_);
   oss << *ll_module;
   oss.flush();
-  ptx_ = compile_llvm_module(std::move(ll_module), device);
+  std::string cache_path = tools::getenv("TRITON_DEBUG_CACHE_PATH");
+  if(cache_path.empty())
+    ptx_ = compile_llvm_module(std::move(ll_module), device);
+  else{
+    tools::mkdir(cache_path);
+    // update cache path to PTX file
+    unsigned char hash[20];
+    sha1::calc((void*)llir_.data(), llir_.size(), hash);
+    char _hex[40];
+    sha1::toHexString(hash, _hex);
+    std::string hex(_hex, _hex + 40);
+    cache_path += "/" + hex;
+    // read
+    std::ifstream ifs(cache_path);
+    std::ostringstream _ptx;
+    if(ifs)
+      _ptx << ifs.rdbuf();
+    ptx_ = _ptx.str();
+    // compile and write-back if read empty
+    if(ptx_.empty()){
+      ptx_ = compile_llvm_module(std::move(ll_module), device);
+      std::ofstream ofs(cache_path);
+      ofs << ptx_;
+    }
+  }
   init_from_ptx(ptx_);
 }
 
diff --git a/tutorials/01-matmul.cc b/tutorials/01-matmul.cc
index c878a5a54..1188b222d 100644
--- a/tutorials/01-matmul.cc
+++ b/tutorials/01-matmul.cc
@@ -184,7 +184,7 @@ float triton_dot(drv::context* context,  drv::stream* stream,
   rt::add_arg(oss, *dlocks->cu());
   // function
   rt::function function(src::dot, opt, device);
-//  std::cout << function.get_kernels()[0].second->get_asm(rt::ASM_LLIR) << std::endl;
+//  std::cout << function.get_kernels()[0].second->get_asm(rt::ASM_NV_PTX) << std::endl;
   // grid
   auto ceil = [](size_t x, size_t y) { return (x + y - 1) / y; };
   auto grid = [ceil, M, N](const rt::options_t& x) {