1 files changed, 22 insertions, 0 deletions
diff --git a/test/codegen/issue25378.go b/test/codegen/issue25378.go
new file mode 100644
index 0000000..14aa2c3
--- /dev/null
+++ b/test/codegen/issue25378.go
@@ -0,0 +1,22 @@
+// asmcheck
+
+// 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.
+
+package codegen
+
+var wsp = [256]bool{
+	' ':  true,
+	'\t': true,
+	'\n': true,
+	'\r': true,
+}
+
+func zeroExtArgByte(ch byte) bool {
+	return wsp[ch] // amd64:-"MOVBLZX\t..,.."
+}
+
+func zeroExtArgUint16(ch uint16) bool {
+	return wsp[ch] // amd64:-"MOVWLZX\t..,.."
+}