1 files changed, 21 insertions, 0 deletions
diff --git a/tests/codegen-llvm/refs.rs b/tests/codegen-llvm/refs.rs
new file mode 100644
index 00000000000..97c36295085
--- /dev/null
+++ b/tests/codegen-llvm/refs.rs
@@ -0,0 +1,21 @@
+//@ compile-flags: -C no-prepopulate-passes -Zmir-opt-level=0 -Copt-level=0
+
+#![crate_type = "lib"]
+
+// Hack to get the correct size for the length part in slices
+// CHECK: @helper([[USIZE:i[0-9]+]] %_1)
+#[no_mangle]
+pub fn helper(_: usize) {}
+
+// CHECK-LABEL: @ref_dst
+#[no_mangle]
+pub fn ref_dst(s: &[u8]) {
+    // We used to generate an extra alloca and memcpy to ref the dst, so check that we copy
+    // directly to the alloca for "x"
+    // CHECK: store ptr %s.0, {{.*}} %x
+    // CHECK: [[X1:%[0-9]+]] = getelementptr inbounds i8, {{.*}} %x, {{i32 4|i64 8}}
+    // CHECK: store [[USIZE]] %s.1, {{.*}} [[X1]]
+
+    let x = &*s;
+    &x; // keep variable in an alloca
+}