1 files changed, 60 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopVersioning/incorrect-phi.ll b/llvm/test/Transforms/LoopVersioning/incorrect-phi.ll
new file mode 100644
index 00000000000..de170be1376
--- /dev/null
+++ b/llvm/test/Transforms/LoopVersioning/incorrect-phi.ll
@@ -0,0 +1,60 @@
+; RUN: opt -loop-versioning -S < %s | FileCheck %s
+
+; Make sure all PHIs are properly updated in the exit block.  Based on
+; PR28037.
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+@x = external global [2 x [3 x [5 x i16]]]
+
+; CHECK-LABEL: @phi_with_undef
+define void @phi_with_undef() {
+bb6.lr.ph:                                        ; preds = %bb5.preheader
+  br label %bb6
+
+bb6:                                              ; preds = %bb6.lr.ph, %bb6
+  %_tmp1423 = phi i64 [ undef, %bb6.lr.ph ], [ %_tmp142, %bb6 ]
+  %_tmp123 = getelementptr [2 x [3 x [5 x i16]]], [2 x [3 x [5 x i16]]]* @x, i16 0, i64 undef
+  %_tmp126 = getelementptr [3 x [5 x i16]], [3 x [5 x i16]]* %_tmp123, i16 0, i64 %_tmp1423
+  %_tmp129 = getelementptr [5 x i16], [5 x i16]* %_tmp126, i16 0, i64 undef
+  %_tmp130 = load i16, i16* %_tmp129
+  store i16 undef, i16* getelementptr ([2 x [3 x [5 x i16]]], [2 x [3 x [5 x i16]]]* @x, i64 0, i64 undef, i64 undef, i64 undef)
+  %_tmp142 = add i64 %_tmp1423, 1
+  br i1 false, label %bb6, label %loop.exit
+
+loop.exit:                                ; preds = %bb6
+  %_tmp142.lcssa = phi i64 [ %_tmp142, %bb6 ]
+  %split = phi i16 [ undef, %bb6 ]
+; CHECK: %split = phi i16 [ undef, %bb6 ], [ undef, %bb6.lver.orig ]
+  br label %bb9
+
+bb9:                                              ; preds = %bb9.loopexit, %bb1
+  ret void
+}
+
+; CHECK-LABEL: @phi_with_non_loop_defined_value
+define void @phi_with_non_loop_defined_value() {
+bb6.lr.ph:                                        ; preds = %bb5.preheader
+  %t = add i16 1, 1
+  br label %bb6
+
+bb6:                                              ; preds = %bb6.lr.ph, %bb6
+  %_tmp1423 = phi i64 [ undef, %bb6.lr.ph ], [ %_tmp142, %bb6 ]
+  %_tmp123 = getelementptr [2 x [3 x [5 x i16]]], [2 x [3 x [5 x i16]]]* @x, i16 0, i64 undef
+  %_tmp126 = getelementptr [3 x [5 x i16]], [3 x [5 x i16]]* %_tmp123, i16 0, i64 %_tmp1423
+  %_tmp129 = getelementptr [5 x i16], [5 x i16]* %_tmp126, i16 0, i64 undef
+  %_tmp130 = load i16, i16* %_tmp129
+  store i16 undef, i16* getelementptr ([2 x [3 x [5 x i16]]], [2 x [3 x [5 x i16]]]* @x, i64 0, i64 undef, i64 undef, i64 undef)
+  %_tmp142 = add i64 %_tmp1423, 1
+  br i1 false, label %bb6, label %loop.exit
+
+loop.exit:                                ; preds = %bb6
+  %_tmp142.lcssa = phi i64 [ %_tmp142, %bb6 ]
+  %split = phi i16 [ %t, %bb6 ]
+; CHECK: %split = phi i16 [ %t, %bb6 ], [ %t, %bb6.lver.orig ]
+  br label %bb9
+
+bb9:                                              ; preds = %bb9.loopexit, %bb1
+  ret void
+}