switch to O1 flag

src/main.cpp

@@ -96,10 +96,11 @@ int main(int argc, const char **argv) {
     std::make_shared<PassBuildCFG>(),
     std::make_shared<PassMem2Reg>(),
   };
-
+  if (flg_O1) {
     for (auto pass : passes) {
       pass->run(visitor.module);
     }
+  }
 
   if (emit_llvm) {
     auto llir_file = output_file.substr(0, output_file.rfind(".")) + ".ll";

src/pass_mem2reg.cpp

@@ -69,6 +69,18 @@ static void analyze_alloca(InstAllocaPtr_t ai, AllocaInfo &info) {
         info.only_in_1_block = false;
     }
   }
+  std::cout << "Alloca " << ai->name;
+  std::cout << "  Def: [";
+  for (auto blk : info.def_blocks) {
+    std::cout << blk->name << ", ";
+  }
+  std::cout << "]\n";
+  std::cout << "  Use: [";
+  for (auto blk : info.def_blocks) {
+    std::cout << blk->name << ", ";
+  }
+  std::cout << "]\n";
+  std::cout.flush();
 }
 
 // static bool rewrite_single_store(InstAllocaPtr_t ai, AllocaInfo& alloca_info) {