diff --git a/.gitignore b/.gitignore
index ba65bc3..7b8fe0e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,4 @@ example/example.uvguix.gabriel
 example/GCC_Out
 documents/.DS_Store
 documents/Doxygen
+*.gabriel
diff --git a/README.md b/README.md
index 8461f87..3e1b87b 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# perf_counter (v1.9.7)
+# perf_counter (v1.9.8-dev)
 A dedicated performance counter for Cortex-M Systick. It shares the SysTick with users' original SysTick function(s) without interfering with it. This library will bring new functionalities, such as performance counter,` delay_us` and `clock()` service defined in `time.h`.
 
 ### Features:
diff --git a/example/RTE/_gcc_lib/RTE_Components.h b/example/RTE/_gcc_lib/RTE_Components.h
index 2d41ab0..eb631d3 100644
--- a/example/RTE/_gcc_lib/RTE_Components.h
+++ b/example/RTE/_gcc_lib/RTE_Components.h
@@ -16,7 +16,7 @@
  */
 #define CMSIS_device_header "ARMCM0.h"
 
-/* GorgonMeducer.Performance Counter::Utilities:perf_counter:Core:Library:1.9.4 */
+/* GorgonMeducer.Performance Counter::Utilities:perf_counter:Core:Library:1.9.6 */
 #define __PERF_COUNTER__
 
 
diff --git a/lib/libperf_counter_gcc.a b/lib/libperf_counter_gcc.a
index dfbc78c..50b7f85 100644
Binary files a/lib/libperf_counter_gcc.a and b/lib/libperf_counter_gcc.a differ
diff --git a/lib/perf_counter.h b/lib/perf_counter.h
index 813d589..856cade 100644
--- a/lib/perf_counter.h
+++ b/lib/perf_counter.h
@@ -35,9 +35,9 @@ extern "C" {
  */
 #define __PERF_COUNTER_VER_MAJOR__          1
 #define __PERF_COUNTER_VER_MINOR__          9
-#define __PERF_COUNTER_VER_REVISE__         7
+#define __PERF_COUNTER_VER_REVISE__         8
 
-#define __PERF_COUNTER_VER_STR__            "rel"
+#define __PERF_COUNTER_VER_STR__            "dev"
 
 #define __PER_COUNTER_VER__    (__PERF_COUNTER_VER_MAJOR__ * 10000ul            \
                                +__PERF_COUNTER_VER_MINOR__ * 100ul              \
diff --git a/lib/perf_counter.lib b/lib/perf_counter.lib
index 6910393..9c8f107 100644
Binary files a/lib/perf_counter.lib and b/lib/perf_counter.lib differ
diff --git a/perf_counter.c b/perf_counter.c
index 17575bb..9b297e9 100644
--- a/perf_counter.c
+++ b/perf_counter.c
@@ -295,13 +295,16 @@ void __perf_counter_init(void)
 
 void delay_us(int32_t nUs)
 {
-    int64_t lUs = nUs * s_nUSUnit;
+    int64_t lUs = (int64_t)nUs * (int64_t)s_nUSUnit;
+    int32_t iCompensate = g_nOffset > PERF_CNT_DELAY_US_COMPENSATION
+                        ? g_nOffset 
+                        : PERF_CNT_DELAY_US_COMPENSATION;
 
-    if (lUs <= PERF_CNT_DELAY_US_COMPENSATION) {
+    if (lUs <= iCompensate) {
         return ;
     }
 
-    lUs -= PERF_CNT_DELAY_US_COMPENSATION;
+    lUs -= iCompensate;
 
     lUs += get_system_ticks();
     while(get_system_ticks() < lUs);
@@ -310,13 +313,16 @@ void delay_us(int32_t nUs)
 
 void delay_ms(int32_t nMs)
 {
-    int64_t lUs = nMs * s_nMSUnit;
+    int64_t lUs = (int64_t)nMs * (int64_t)s_nMSUnit;
+    int32_t iCompensate = g_nOffset > PERF_CNT_DELAY_US_COMPENSATION
+                        ? g_nOffset 
+                        : PERF_CNT_DELAY_US_COMPENSATION;
 
-    if (lUs <= PERF_CNT_DELAY_US_COMPENSATION) {
+    if (lUs <= iCompensate) {
         return ;
     }
 
-    lUs -= PERF_CNT_DELAY_US_COMPENSATION;
+    lUs -= iCompensate;
 
     lUs += get_system_ticks();
     while(get_system_ticks() < lUs);
diff --git a/perf_counter.h b/perf_counter.h
index 813d589..856cade 100644
--- a/perf_counter.h
+++ b/perf_counter.h
@@ -35,9 +35,9 @@ extern "C" {
  */
 #define __PERF_COUNTER_VER_MAJOR__          1
 #define __PERF_COUNTER_VER_MINOR__          9
-#define __PERF_COUNTER_VER_REVISE__         7
+#define __PERF_COUNTER_VER_REVISE__         8
 
-#define __PERF_COUNTER_VER_STR__            "rel"
+#define __PERF_COUNTER_VER_STR__            "dev"
 
 #define __PER_COUNTER_VER__    (__PERF_COUNTER_VER_MAJOR__ * 10000ul            \
                                +__PERF_COUNTER_VER_MINOR__ * 100ul              \