1 files changed, 36 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/SystemZ/buildvector-00.ll b/llvm/test/CodeGen/SystemZ/buildvector-00.ll
new file mode 100644
index 00000000000..dc1c0ffd4f6
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/buildvector-00.ll
@@ -0,0 +1,36 @@
+; Test that the dag combiner can understand that some vector operands are
+; all-zeros and then optimize the logical operations.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 | FileCheck %s
+
+define void @f1() {
+; CHECK-LABEL: f1:
+; CHECK: vno
+; CHECK-NOT: vno
+
+bb:
+  %tmp = shufflevector <2 x i64> undef, <2 x i64> undef, <2 x i32> zeroinitializer
+  br label %bb1
+
+bb1:                                              ; preds = %bb
+  %tmp2 = load i64, i64* undef, align 8
+  %tmp3 = insertelement <2 x i64> undef, i64 %tmp2, i32 1
+  %tmp4 = icmp ne <2 x i64> undef, zeroinitializer
+  %tmp5 = xor <2 x i1> %tmp4, zeroinitializer
+  %tmp6 = xor <2 x i1> zeroinitializer, %tmp5
+  %tmp7 = and <2 x i64> %tmp3, %tmp
+  %tmp8 = icmp ne <2 x i64> %tmp7, zeroinitializer
+  %tmp9 = xor <2 x i1> zeroinitializer, %tmp8
+  %tmp10 = icmp ne <2 x i64> undef, zeroinitializer
+  %tmp11 = xor <2 x i1> %tmp10, %tmp9
+  %tmp12 = and <2 x i1> %tmp6, %tmp11
+  %tmp13 = extractelement <2 x i1> %tmp12, i32 0
+  br i1 %tmp13, label %bb14, label %bb15
+
+bb14:                                             ; preds = %bb1
+  store i64 undef, i64* undef, align 8
+  br label %bb15
+
+bb15:                                             ; preds = %bb14, %bb1
+  unreachable
+}