From f9c765ed76bcaa9aa2ccc902e61e3de91ec96837 Mon Sep 17 00:00:00 2001
From: Jamie Hill-Daniel <jamie@hill-daniel.co.uk>
Date: Tue, 26 Aug 2025 13:44:00 +0000
Subject: [PATCH] Test `instrument-mcount`

---
 tests/assembly-llvm/x86_64-mcount.rs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 tests/assembly-llvm/x86_64-mcount.rs

diff --git a/tests/assembly-llvm/x86_64-mcount.rs b/tests/assembly-llvm/x86_64-mcount.rs
new file mode 100644
index 000000000000..0428272cfc59
--- /dev/null
+++ b/tests/assembly-llvm/x86_64-mcount.rs
@@ -0,0 +1,24 @@
+//@ assembly-output: emit-asm
+//@ compile-flags: -Zinstrument-mcount=y -Cllvm-args=-x86-asm-syntax=intel
+
+//@ revisions: x86_64-linux
+//@[x86_64-linux] compile-flags: --target=x86_64-unknown-linux-gnu
+//@[x86_64-linux] needs-llvm-components: x86
+//@[x86_64-linux] only-x86_64-unknown-linux-gnu
+
+//@ revisions: x86_64-darwin
+//@[x86_64-darwin] compile-flags: --target=x86_64-apple-darwin
+//@[x86_64-darwin] needs-llvm-components: x86
+//@[x86_64-darwin] only-x86_64-apple-darwin
+
+#![crate_type = "lib"]
+
+// CHECK-LABEL: mcount_func:
+#[no_mangle]
+pub fn mcount_func() {
+    // CHECK: call mcount
+
+    std::hint::black_box(());
+
+    // CHECK: ret
+}