diff --git a/tests/assembly/ilog2.rs b/tests/assembly/ilog2.rs
new file mode 100644
index 00000000..3dad216f
--- /dev/null
+++ b/tests/assembly/ilog2.rs
@@ -0,0 +1,13 @@
+// assembly-output: bpf-linker
+// compile-flags: --crate-type cdylib -C link-arg=--unroll-loops -C link-arg=-O3
+#![no_std]
+// bpf target did not historically support the ilog2 operation because LLVM did
+// not have a way to do leading/trailing bits
+
+// aux-build: loop-panic-handler.rs
+extern crate loop_panic_handler;
+
+#[no_mangle]
+fn foo(arg: &mut u64) {
+    *arg = arg.ilog2() as u64;
+}