1 files changed, 26 insertions, 0 deletions
diff --git a/test/fixedbugs/issue26438.go b/test/fixedbugs/issue26438.go
new file mode 100644
index 0000000..d44da21
--- /dev/null
+++ b/test/fixedbugs/issue26438.go
@@ -0,0 +1,26 @@
+// run
+
+// Copyright 2018 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 26438: arm64 backend may use 64-bit TST for
+// "if uint32(a)&uint32(b) == 0", which should be
+// 32-bit TSTW
+
+package main
+
+//go:noinline
+func tstw(a, b uint64) uint64 {
+	if uint32(a)&uint32(b) == 0 {
+		return 100
+	} else {
+		return 200
+	}
+}
+
+func main() {
+	if tstw(0xff00000000, 0xaa00000000) == 200 {
+		panic("impossible")
+	}
+}