diff --git a/.gitignore b/.gitignore
index 3c73ba5..50c5e73 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 build/
 .antlr/
 *.log
-__pycache__/
\ No newline at end of file
+__pycache__/
+*.o
\ No newline at end of file
diff --git a/scripts/compiler.py b/scripts/compiler.py
index 5398107..7cd0b36 100644
--- a/scripts/compiler.py
+++ b/scripts/compiler.py
@@ -2,8 +2,8 @@ import os
 import subprocess
 from pretty_print import Print_C
 
-lib = "build/lib/libsysy.a"
-header = "build/include/sylib.h"
+lib = "tools/sylib/libsysy_x86.a"
+header = "tools/sylib/sylib.h"
 
 class Compiler:
     def __init__(self, scheme, testcases):
@@ -78,7 +78,11 @@ class Compiler:
         log_file = open(log, "a+")
 
         Print_C.print_procedure(f"Generating {self.scheme}.s")
-        subprocess.run(f"llc -O3 -march=arm -mcpu=cortex-a72 -float-abi=hard -filetype=asm {ir} -o {asm}".split(), stdout=log_file, stderr=log_file, bufsize=1)
+        # subprocess.run(f"llc -O3 -march=arm -mcpu=cortex-a72 -float-abi=hard -filetype=asm {ir} -o {asm}".split(), stdout=log_file, stderr=log_file, bufsize=1)
+        completed = subprocess.run(f"llc -O3 --relocation-model=pic {ir} -o {asm}".split(), stdout=log_file, stderr=log_file, bufsize=1)
+        if completed.returncode != 0:
+            Print_C.print_error(f"Generating {self.scheme}.s failed! See {log} | {ir}")
+            self.count_error += 1
 
         log_file.close()
 
@@ -91,8 +95,11 @@ class Compiler:
         log_file = open(log, "a+")
 
         Print_C.print_procedure(f"Generating {self.scheme}.o")
-        subprocess.run(f"as -march=armv7-a -mfloat-abi=hard {asm} -o {obj}".split(), stdout=log_file, stderr=log_file, bufsize=1)
-
+        # subprocess.run(f"as -march=armv7-a -mfloat-abi=hard {asm} -o {obj}".split(), stdout=log_file, stderr=log_file, bufsize=1)
+        completed = subprocess.run(f"as {asm} -o {obj}".split(), stdout=log_file, stderr=log_file, bufsize=1)
+        if completed.returncode != 0:
+            Print_C.print_error(f"Generating {self.scheme}.o failed! See {log}")
+            self.count_error += 1
         log_file.close()
 
     def obj_to_bin(self, testcase):
@@ -103,8 +110,11 @@ class Compiler:
         log_file = open(log, "a+")
 
         Print_C.print_procedure(f"Generating {self.scheme}")
-        subprocess.run(f"clang -Ofast -marm -march=armv7-a -mfpu=neon -mfloat-abi=hard {obj} {lib} -o {bin}".split(), stdout=log_file, stderr=log_file, bufsize=1)
-
+        # subprocess.run(f"clang -Ofast -marm -march=armv7-a -mfpu=neon -mfloat-abi=hard {obj} {lib} -o {bin}".split(), stdout=log_file, stderr=log_file, bufsize=1)
+        completed = subprocess.run(f"clang -Ofast -fPIE {obj} {lib} -o {bin}".split(), stdout=log_file, stderr=log_file, bufsize=1)
+        if completed.returncode != 0:
+            Print_C.print_error(f"Linking {self.scheme} failed! See {log}")
+            self.count_error += 1
         log_file.close()
 
 
@@ -148,5 +158,16 @@ class Compiler:
             if self.count_error >= 1:
                 Print_C.print_error(f"Test script stopped due to too many errors")
                 return
+    
+    def compile_reference(self, frontend_instr, category):
+        for testcase in self.testcases:
+            Print_C.print_subheader(f"[Compiling {self.scheme} | {testcase}]")
+            self.sy_to_ir(frontend_instr=frontend_instr, testcase=testcase, category=category)
+            self.ir_to_asm(testcase=testcase)
+            self.asm_to_obj(testcase=testcase)
+            self.obj_to_bin(testcase=testcase)
+            if self.count_error >= 1:
+                Print_C.print_error(f"Test script stopped due to too many errors")
+                return
 
         
\ No newline at end of file
diff --git a/scripts/tester.py b/scripts/tester.py
index 8fed9f7..d1aabcb 100644
--- a/scripts/tester.py
+++ b/scripts/tester.py
@@ -36,6 +36,9 @@ class Tester:
 
     def compile_rubbish(self, category):
         self.compiler.compile_rubbish(frontend_instr=self.frontend_instr, category=category)
+    
+    def compile_reference(self, category):
+        self.compiler.compile_reference(frontend_instr=self.frontend_instr, category=category)
 
     def run(self):
         self.runner.run_all_tests()
@@ -84,6 +87,12 @@ my_scheme = {"scheme": "my",
               "frontend_instr": my_compiler + " -S {sy} -o {ir}",
               "emit_llvm_ir": False}
 
+llir_scheme = {"scheme": "llir",
+                "frontend_instr": "clang -x c -c -fPIE -S -emit-llvm -include {header} {sy} -o {ir}",
+                "emit_llvm_ir": True}
+
+# gcc -c -fPIC -o sylib.o -include sylib.h sylib.c && ar rcs libsysy_x86.a sylib.o
+
 # ustc_ustc_scheme = {"scheme": "ustc_ustc",
 #                     "frontend_instr": ustc_compiler + "-o {asm} {sy}",
 #                     "emit_llvm_ir": False}
@@ -103,7 +112,8 @@ my_scheme = {"scheme": "my",
 
 
 if __name__ == '__main__':
-    testcases = get_sy_testcases(sub_dir="functional_test")
+    category = "functional"
+    testcases = get_sy_testcases(sub_dir=category)
     all_schemes = [clang_llvm_scheme, thu_llvm_scheme, thu_thu_scheme] # gcc_gcc_scheme, ustc_ustc_scheme, ustc_ustc_no_vec_scheme]
     testers = []
     Print_C.print_header("[Removing old data...]\n\n")
@@ -113,7 +123,8 @@ if __name__ == '__main__':
     subprocess.run("rm -rf build/log/run_log".split())
     subprocess.run("rm -rf build/log/test_result.log".split())
 
-    Tester(my_scheme, True, testcases).compile_rubbish(category="functional_test")
+    # Tester(my_scheme, True, testcases).compile_rubbish(category=category)
+    Tester(llir_scheme, True, testcases).compile_reference(category=category)
 
     # for scheme in all_schemes:
     #     tester = Tester(scheme, is_trivial=True)
diff --git a/tools/sylib/libsysy.a b/tools/sylib/libsysy.a
new file mode 100644
index 0000000..85780e5
Binary files /dev/null and b/tools/sylib/libsysy.a differ
diff --git a/tools/sylib/libsysy_x86.a b/tools/sylib/libsysy_x86.a
new file mode 100644
index 0000000..8a5af1d
Binary files /dev/null and b/tools/sylib/libsysy_x86.a differ
diff --git a/tools/sylib/sylib.c b/tools/sylib/sylib.c
new file mode 100644
index 0000000..717e8fe
--- /dev/null
+++ b/tools/sylib/sylib.c
@@ -0,0 +1,89 @@
+#include<stdio.h>
+#include<stdarg.h>
+#include<sys/time.h>
+#include"sylib.h"
+struct timeval _sysy_start,_sysy_end;
+
+int _sysy_l1[_SYSY_N],_sysy_l2[_SYSY_N];
+int _sysy_h[_SYSY_N], _sysy_m[_SYSY_N],_sysy_s[_SYSY_N],_sysy_us[_SYSY_N];
+int _sysy_idx;
+
+/* Input & output functions */
+int getint(){int t; scanf("%d",&t); return t; }
+int getch(){char c; scanf("%c",&c); return (int)c; }
+float getfloat(){
+    float n;
+    scanf("%a", &n);
+    return n;
+}
+
+int getarray(int a[]){
+  int n;
+  scanf("%d",&n);
+  for(int i=0;i<n;i++)scanf("%d",&a[i]);
+  return n;
+}
+
+int getfarray(float a[]) {
+    int n;
+    scanf("%d", &n);
+    for (int i = 0; i < n; i++) {
+        scanf("%a", &a[i]);
+    }
+    return n;
+}
+void putint(int a){ printf("%d",a);}
+void putch(int a){ printf("%c",a); }
+void putarray(int n,int a[]){
+  printf("%d:",n);
+  for(int i=0;i<n;i++)printf(" %d",a[i]);
+  printf("\n");
+}
+// void putfloat(float a) {
+//   printf("%a", a);
+// }
+void putfarray(int n, float a[]) {
+    printf("%d:", n);
+    for (int i = 0; i < n; i++) {
+        printf(" %a", a[i]);
+    }
+    printf("\n");
+}
+
+void putf(char a[], ...) {
+    va_list args;
+    va_start(args, a);
+    vfprintf(stdout, a, args);
+    va_end(args);
+}
+
+/* Timing function implementation */
+__attribute((constructor)) void before_main(){
+  for(int i=0;i<_SYSY_N;i++)
+    _sysy_h[i] = _sysy_m[i]= _sysy_s[i] = _sysy_us[i] =0;
+  _sysy_idx=1;
+}  
+__attribute((destructor)) void after_main(){
+  for(int i=1;i<_sysy_idx;i++){
+    fprintf(stderr,"Timer@%04d-%04d: %dH-%dM-%dS-%dus\n",\
+      _sysy_l1[i],_sysy_l2[i],_sysy_h[i],_sysy_m[i],_sysy_s[i],_sysy_us[i]);
+    _sysy_us[0]+= _sysy_us[i]; 
+    _sysy_s[0] += _sysy_s[i]; _sysy_us[0] %= 1000000;
+    _sysy_m[0] += _sysy_m[i]; _sysy_s[0] %= 60;
+    _sysy_h[0] += _sysy_h[i]; _sysy_m[0] %= 60;
+  }
+  fprintf(stderr,"TOTAL: %dH-%dM-%dS-%dus\n",_sysy_h[0],_sysy_m[0],_sysy_s[0],_sysy_us[0]);
+}  
+void _sysy_starttime(int lineno){
+  _sysy_l1[_sysy_idx] = lineno;
+  gettimeofday(&_sysy_start,NULL);
+}
+void _sysy_stoptime(int lineno){
+  gettimeofday(&_sysy_end,NULL);
+  _sysy_l2[_sysy_idx] = lineno;
+  _sysy_us[_sysy_idx] += 1000000 * ( _sysy_end.tv_sec - _sysy_start.tv_sec ) + _sysy_end.tv_usec - _sysy_start.tv_usec;
+  _sysy_s[_sysy_idx] += _sysy_us[_sysy_idx] / 1000000 ; _sysy_us[_sysy_idx] %= 1000000;
+  _sysy_m[_sysy_idx] += _sysy_s[_sysy_idx] / 60 ; _sysy_s[_sysy_idx] %= 60;
+  _sysy_h[_sysy_idx] += _sysy_m[_sysy_idx] / 60 ; _sysy_m[_sysy_idx] %= 60;
+  _sysy_idx ++;
+}
diff --git a/tools/sylib/sylib.h b/tools/sylib/sylib.h
new file mode 100644
index 0000000..ee22cba
--- /dev/null
+++ b/tools/sylib/sylib.h
@@ -0,0 +1,26 @@
+#ifndef __SYLIB_H_
+#define __SYLIB_H_
+
+#include<stdio.h>
+#include<stdarg.h>
+#include<sys/time.h>
+#ifdef __cplusplus
+extern "C" {
+#endif
+/* Input & output functions */
+int getint(),getch(),getarray(int a[]);
+void putint(int a),putch(int a),putarray(int n,int a[]);
+// #define putf(fmt, ...) printf(fmt, __VA_ARGS__) // TODO? 
+/* Timing function implementation */
+#define starttime() _sysy_starttime(__LINE__)
+#define stoptime()  _sysy_stoptime(__LINE__)
+#define _SYSY_N 1024
+
+__attribute((constructor)) void before_main(); 
+__attribute((destructor)) void after_main();
+void _sysy_starttime(int lineno);
+void _sysy_stoptime(int lineno);
+#ifdef __cplusplus
+}
+#endif
+#endif