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-rw-r--r--test/codegen/issue42610.go30
1 files changed, 30 insertions, 0 deletions
diff --git a/test/codegen/issue42610.go b/test/codegen/issue42610.go
new file mode 100644
index 0000000..c7eeddc
--- /dev/null
+++ b/test/codegen/issue42610.go
@@ -0,0 +1,30 @@
+// 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
+ }
+ // ppc64le: -"RLWNIM"
+ // ppc64: -"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
+ }
+ // ppc64le: -"RLDIC"
+ // ppc64: -"RLDIC"
+ a[0] = g(8) >> 1
+}