1 files changed, 27 insertions, 0 deletions
diff --git a/tests/assembly-llvm/x86_64-indirect-branch-cs-prefix.rs b/tests/assembly-llvm/x86_64-indirect-branch-cs-prefix.rs
new file mode 100644
index 00000000000..8e4470ee451
--- /dev/null
+++ b/tests/assembly-llvm/x86_64-indirect-branch-cs-prefix.rs
@@ -0,0 +1,27 @@
+// Test that the `cs` prefix is (not) added into a `call` and a `jmp` to the
+// indirect thunk when the `-Zindirect-branch-cs-prefix` flag is (not) set.
+
+//@ revisions: unset set
+//@ assembly-output: emit-asm
+//@ compile-flags: -Copt-level=3 -Cunsafe-allow-abi-mismatch=retpoline,retpoline-external-thunk,indirect-branch-cs-prefix -Zretpoline-external-thunk
+//@ [set] compile-flags: -Zindirect-branch-cs-prefix
+//@ only-x86_64
+//@ ignore-apple Symbol is called `___x86_indirect_thunk` (Darwin's extra underscore)
+
+#![crate_type = "lib"]
+
+// CHECK-LABEL: foo:
+#[no_mangle]
+pub fn foo(g: fn()) {
+    // unset-NOT: cs
+    // unset: callq {{__x86_indirect_thunk.*}}
+    // set: cs
+    // set-NEXT: callq {{__x86_indirect_thunk.*}}
+    g();
+
+    // unset-NOT: cs
+    // unset: jmp {{__x86_indirect_thunk.*}}
+    // set: cs
+    // set-NEXT: jmp {{__x86_indirect_thunk.*}}
+    g();
+}