1 files changed, 15 insertions, 0 deletions
diff --git a/test/codegen/issue38554.go b/test/codegen/issue38554.go
new file mode 100644
index 0000000000..84db8473d3
--- /dev/null
+++ b/test/codegen/issue38554.go
@@ -0,0 +1,15 @@
+// asmcheck
+
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test that we are zeroing directly instead of
+// copying a large zero value. Issue 38554.
+
+package codegen
+
+func retlarge() [256]byte {
+	// amd64:-"DUFFCOPY"
+	return [256]byte{}
+}