1 files changed, 17 insertions, 0 deletions
diff --git a/tests/mir-opt/pre-codegen/mem_replace.rs b/tests/mir-opt/pre-codegen/mem_replace.rs
new file mode 100644
index 000000000..e5066c38b
--- /dev/null
+++ b/tests/mir-opt/pre-codegen/mem_replace.rs
@@ -0,0 +1,17 @@
+// compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2
+// only-64bit
+// ignore-debug
+
+#![crate_type = "lib"]
+
+// EMIT_MIR mem_replace.manual_replace.PreCodegen.after.mir
+pub fn manual_replace(r: &mut u32, v: u32) -> u32 {
+    let temp = *r;
+    *r = v;
+    temp
+}
+
+// EMIT_MIR mem_replace.mem_replace.PreCodegen.after.mir
+pub fn mem_replace(r: &mut u32, v: u32) -> u32 {
+    std::mem::replace(r, v)
+}