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-rw-r--r--test/codegen/logic.go24
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diff --git a/test/codegen/logic.go b/test/codegen/logic.go
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+// 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
+}