diff --git a/prefetcher_reverse/src/bin/ip_test.rs b/prefetcher_reverse/src/bin/ip_test.rs
new file mode 100644
index 0000000..ad0444b
--- /dev/null
+++ b/prefetcher_reverse/src/bin/ip_test.rs
@@ -0,0 +1,5 @@
+use prefetcher_reverse::ip_tool::tmp_test;
+
+fn main() {
+    tmp_test();
+}
diff --git a/prefetcher_reverse/src/ip_tool.rs b/prefetcher_reverse/src/ip_tool.rs
index e69de29..8bb2492 100644
--- a/prefetcher_reverse/src/ip_tool.rs
+++ b/prefetcher_reverse/src/ip_tool.rs
@@ -0,0 +1,20 @@
+global_asm!(
+    ".global timed_maccess_template",
+    "timed_maccess_template:",
+    "nop",
+    "ret",
+    ".global timed_maccess_template_end",
+    "timed_maccess_template_end:",
+    "nop",
+);
+
+extern "C" {
+    fn timed_maccess_template(pointer: *const u8) -> u64;
+    fn timed_maccess_template_end();
+}
+
+pub fn tmp_test() {
+    let size = timed_maccess_template_end as *const u8 as usize
+        - timed_maccess_template as *const u8 as usize;
+    println!("function size : {}", size);
+}
diff --git a/prefetcher_reverse/src/lib.rs b/prefetcher_reverse/src/lib.rs
index fdd1668..4706ace 100644
--- a/prefetcher_reverse/src/lib.rs
+++ b/prefetcher_reverse/src/lib.rs
@@ -1,3 +1,4 @@
+#![feature(global_asm)]
 #![deny(unsafe_op_in_unsafe_fn)]
 
 use crate::Probe::{Flush, FullFlush, Load};