summaryrefslogtreecommitdiffstats
path: root/src/test/codegen/nrvo.rs
diff options
context:
space:
mode:
Diffstat (limited to 'src/test/codegen/nrvo.rs')
-rw-r--r--src/test/codegen/nrvo.rs17
1 files changed, 17 insertions, 0 deletions
diff --git a/src/test/codegen/nrvo.rs b/src/test/codegen/nrvo.rs
new file mode 100644
index 000000000..fddb0d1fb
--- /dev/null
+++ b/src/test/codegen/nrvo.rs
@@ -0,0 +1,17 @@
+// compile-flags: -O
+
+#![crate_type = "lib"]
+
+// Ensure that we do not call `memcpy` for the following function.
+// `memset` and `init` should be called directly on the return pointer.
+#[no_mangle]
+pub fn nrvo(init: fn(&mut [u8; 4096])) -> [u8; 4096] {
+ // CHECK-LABEL: nrvo
+ // CHECK: @llvm.memset
+ // CHECK-NOT: @llvm.memcpy
+ // CHECK: ret
+ // CHECK-EMPTY
+ let mut buf = [0; 4096];
+ init(&mut buf);
+ buf
+}