1 files changed, 37 insertions, 0 deletions
diff --git a/test/fixedbugs/issue16985.go b/test/fixedbugs/issue16985.go
new file mode 100644
index 0000000..0cb0dae
--- /dev/null
+++ b/test/fixedbugs/issue16985.go
@@ -0,0 +1,37 @@
+// run
+
+// Copyright 2016 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.
+
+// issue 16985: intrinsified AMD64 atomic ops should clobber flags
+
+package main
+
+import "sync/atomic"
+
+var count uint32
+
+func main() {
+	buffer := []byte("T")
+	for i := 0; i < len(buffer); {
+		atomic.AddUint32(&count, 1)
+		_ = buffer[i]
+		i++
+		i++
+	}
+
+	for i := 0; i < len(buffer); {
+		atomic.CompareAndSwapUint32(&count, 0, 1)
+		_ = buffer[i]
+		i++
+		i++
+	}
+
+	for i := 0; i < len(buffer); {
+		atomic.SwapUint32(&count, 1)
+		_ = buffer[i]
+		i++
+		i++
+	}
+}