1 files changed, 24 insertions, 0 deletions
diff --git a/test/codegen/logic.go b/test/codegen/logic.go
new file mode 100644
index 0000000..9afdfd7
--- /dev/null
+++ b/test/codegen/logic.go
@@ -0,0 +1,24 @@
+// 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 gx, gy int
+
+// Test to make sure that (CMPQ (ANDQ x y) [0]) does not get rewritten to
+// (TESTQ x y) if the ANDQ has other uses. If that rewrite happens, then one
+// of the args of the ANDQ needs to be saved so it can be used as the arg to TESTQ.
+func andWithUse(x, y int) int {
+	// Load x,y into registers, so those MOVQ will not appear at the z := x&y line.
+	gx, gy = x, y
+	// amd64:-"MOVQ"
+	z := x & y
+	if z == 0 {
+		return 77
+	}
+	// use z by returning it
+	return z
+}