1 files changed, 121 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopUnswitch/unswitch-equality-undef.ll b/llvm/test/Transforms/LoopUnswitch/unswitch-equality-undef.ll
new file mode 100644
index 00000000000..d77de7bd571
--- /dev/null
+++ b/llvm/test/Transforms/LoopUnswitch/unswitch-equality-undef.ll
@@ -0,0 +1,121 @@
+; RUN: opt < %s -instcombine -licm -loop-unswitch -loop-unswitch-threshold=1000 -disable-output -stats 2>&1| FileCheck %s
+; Check no loop unswitch is done because unswitching of equality expr with
+; undef is unsafe before the freeze patch is committed.
+; CHECK-NOT: Number of branches unswitched
+
+define void @ham(i64 %arg) local_unnamed_addr {
+bb:
+  %tmp = icmp eq i64 %arg, 0
+  br i1 %tmp, label %bb3, label %bb1
+
+bb1:                                              ; preds = %bb
+  %tmp2 = load volatile i64, i64* @global, align 8
+  br label %bb3
+
+bb3:                                              ; preds = %bb1, %bb
+  %tmp4 = phi i64 [ %tmp2, %bb1 ], [ undef, %bb ]
+  %tmp5 = load i64, i64* @global.1, align 8
+  br label %bb6
+
+bb6:                                              ; preds = %bb21, %bb3
+  %tmp7 = phi i64 [ 3, %bb21 ], [ %tmp5, %bb3 ]
+  %tmp8 = phi i64 [ %tmp25, %bb21 ], [ 0, %bb3 ]
+  %tmp9 = icmp eq i64 %tmp7, %arg
+  br i1 %tmp9, label %bb10, label %bb28
+
+bb10:                                             ; preds = %bb6
+  %tmp11 = icmp eq i64 %tmp7, 0
+  br i1 %tmp11, label %bb21, label %bb12
+
+bb12:                                             ; preds = %bb10
+  %tmp13 = load i64, i64* @global.2, align 8
+  %tmp14 = add nsw i64 %tmp13, 1
+  store i64 %tmp14, i64* @global.2, align 8
+  %tmp15 = load i64, i64* @global.3, align 8
+  %tmp16 = icmp eq i64 %tmp15, %tmp4
+  br i1 %tmp16, label %bb17, label %bb21
+
+bb17:                                             ; preds = %bb12
+  %tmp18 = phi i64 [ %tmp15, %bb12 ]
+  %tmp19 = load i64, i64* @global.4, align 8
+  %tmp20 = add nsw i64 %tmp19, %tmp18
+  store i64 %tmp20, i64* @global.5, align 8
+  br label %bb29
+
+bb21:                                             ; preds = %bb12, %bb10
+  %tmp22 = load i64, i64* @global.3, align 8
+  %tmp23 = load volatile i64, i64* @global, align 8
+  %tmp24 = add nsw i64 %tmp23, %tmp22
+  store i64 %tmp24, i64* @global.5, align 8
+  store i64 3, i64* @global.1, align 8
+  %tmp25 = add nsw i64 %tmp8, 1
+  %tmp26 = load i64, i64* @global.6, align 8
+  %tmp27 = icmp slt i64 %tmp25, %tmp26
+  br i1 %tmp27, label %bb6, label %bb28
+
+bb28:                                             ; preds = %bb21, %bb6
+  br label %bb29
+
+bb29:                                             ; preds = %bb28, %bb17
+  ret void
+}
+
+define void @zot(i64 %arg, i64 %arg1) local_unnamed_addr {
+bb:
+  %tmp = icmp eq i64 %arg, 0
+  %tmp2 = select i1 %tmp, i64 %arg1, i64 undef
+  %tmp3 = load i64, i64* @global.1, align 8
+  br label %bb4
+
+bb4:                                              ; preds = %bb19, %bb
+  %tmp5 = phi i64 [ 3, %bb19 ], [ %tmp3, %bb ]
+  %tmp6 = phi i64 [ %tmp23, %bb19 ], [ 0, %bb ]
+  %tmp7 = icmp eq i64 %tmp5, %arg
+  br i1 %tmp7, label %bb8, label %bb26
+
+bb8:                                              ; preds = %bb4
+  %tmp9 = icmp eq i64 %tmp5, 0
+  br i1 %tmp9, label %bb19, label %bb10
+
+bb10:                                             ; preds = %bb8
+  %tmp11 = load i64, i64* @global.2, align 8
+  %tmp12 = add nsw i64 %tmp11, 1
+  store i64 %tmp12, i64* @global.2, align 8
+  %tmp13 = load i64, i64* @global.3, align 8
+  %tmp14 = icmp eq i64 %tmp13, %tmp2
+  br i1 %tmp14, label %bb15, label %bb19
+
+bb15:                                             ; preds = %bb10
+  %tmp16 = phi i64 [ %tmp13, %bb10 ]
+  %tmp17 = load i64, i64* @global.4, align 8
+  %tmp18 = add nsw i64 %tmp17, %tmp16
+  store i64 %tmp18, i64* @global.5, align 8
+  br label %bb27
+
+bb19:                                             ; preds = %bb10, %bb8
+  %tmp20 = load i64, i64* @global.3, align 8
+  %tmp21 = load volatile i64, i64* @global, align 8
+  %tmp22 = add nsw i64 %tmp21, %tmp20
+  store i64 %tmp22, i64* @global.5, align 8
+  store i64 3, i64* @global.1, align 8
+  %tmp23 = add nsw i64 %tmp6, 1
+  %tmp24 = load i64, i64* @global.6, align 8
+  %tmp25 = icmp slt i64 %tmp23, %tmp24
+  br i1 %tmp25, label %bb4, label %bb26
+
+bb26:                                             ; preds = %bb19, %bb4
+  br label %bb27
+
+bb27:                                             ; preds = %bb26, %bb15
+  ret void
+}
+
+@global = common global i64 0, align 8
+@global.1 = common global i64 0, align 8
+@global.2 = common global i64 0, align 8
+@global.3 = common global i64 0, align 8
+@global.4 = common global i64 0, align 8
+@global.5 = common global i64 0, align 8
+@global.6 = common global i64 0, align 8
+
+