1 files changed, 23 insertions, 0 deletions
diff --git a/src/test/codegen/refs.rs b/src/test/codegen/refs.rs
new file mode 100644
index 000000000..0b796754d
--- /dev/null
+++ b/src/test/codegen/refs.rs
@@ -0,0 +1,23 @@
+// compile-flags: -C no-prepopulate-passes -Zmir-opt-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: [[X0:%[0-9]+]] = getelementptr inbounds { {{\[0 x i8\]\*|ptr}}, [[USIZE]] }, {{.*}}  %x, i32 0, i32 0
+// CHECK: store {{\[0 x i8\]\*|ptr}} %s.0, {{.*}} [[X0]]
+// CHECK: [[X1:%[0-9]+]] = getelementptr inbounds { {{\[0 x i8\]\*|ptr}}, [[USIZE]] }, {{.*}} %x, i32 0, i32 1
+// CHECK: store [[USIZE]] %s.1, {{.*}} [[X1]]
+
+    let x = &*s;
+    &x; // keep variable in an alloca
+}