1 files changed, 28 insertions, 0 deletions
diff --git a/test/codegen/issue42610.go b/test/codegen/issue42610.go
new file mode 100644
index 0000000..41d0e90
--- /dev/null
+++ b/test/codegen/issue42610.go
@@ -0,0 +1,28 @@
+// asmcheck
+
+// Copyright 2020 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.
+
+// Don't allow 0 masks in shift lowering rules on ppc64x.
+// See issue 42610.
+
+package codegen
+
+func f32(a []int32, i uint32) {
+        g := func(p int32) int32 {
+                i = uint32(p) * (uint32(p) & (i & 1))
+                return 1
+        }
+        // ppc64x: -"RLWNIM"
+        a[0] = g(8) >> 1
+}
+
+func f(a []int, i uint) {
+	g := func(p int) int {
+		i = uint(p) * (uint(p) & (i & 1))
+		return 1
+	}
+	// ppc64x: -"RLDIC"
+	a[0] = g(8) >> 1
+}