1; REQUIRES: asserts
2; RUN: opt < %s -instcombine -licm -loop-unswitch -loop-unswitch-threshold=1000 -disable-output -stats 2>&1| FileCheck %s
3; Check no loop unswitch is done because unswitching of equality expr with
4; undef is unsafe before the freeze patch is committed.
5; CHECK-NOT: Number of branches unswitched
6
7define void @ham(i64 %arg) local_unnamed_addr {
8bb:
9  %tmp = icmp eq i64 %arg, 0
10  br i1 %tmp, label %bb3, label %bb1
11
12bb1:                                              ; preds = %bb
13  %tmp2 = load volatile i64, i64* @global, align 8
14  br label %bb3
15
16bb3:                                              ; preds = %bb1, %bb
17  %tmp4 = phi i64 [ %tmp2, %bb1 ], [ undef, %bb ]
18  %tmp5 = load i64, i64* @global.1, align 8
19  br label %bb6
20
21bb6:                                              ; preds = %bb21, %bb3
22  %tmp7 = phi i64 [ 3, %bb21 ], [ %tmp5, %bb3 ]
23  %tmp8 = phi i64 [ %tmp25, %bb21 ], [ 0, %bb3 ]
24  %tmp9 = icmp eq i64 %tmp7, %arg
25  br i1 %tmp9, label %bb10, label %bb28
26
27bb10:                                             ; preds = %bb6
28  %tmp11 = icmp eq i64 %tmp7, 0
29  br i1 %tmp11, label %bb21, label %bb12
30
31bb12:                                             ; preds = %bb10
32  %tmp13 = load i64, i64* @global.2, align 8
33  %tmp14 = add nsw i64 %tmp13, 1
34  store i64 %tmp14, i64* @global.2, align 8
35  %tmp15 = load i64, i64* @global.3, align 8
36  %tmp16 = icmp eq i64 %tmp15, %tmp4
37  br i1 %tmp16, label %bb17, label %bb21
38
39bb17:                                             ; preds = %bb12
40  %tmp18 = phi i64 [ %tmp15, %bb12 ]
41  %tmp19 = load i64, i64* @global.4, align 8
42  %tmp20 = add nsw i64 %tmp19, %tmp18
43  store i64 %tmp20, i64* @global.5, align 8
44  br label %bb29
45
46bb21:                                             ; preds = %bb12, %bb10
47  %tmp22 = load i64, i64* @global.3, align 8
48  %tmp23 = load volatile i64, i64* @global, align 8
49  %tmp24 = add nsw i64 %tmp23, %tmp22
50  store i64 %tmp24, i64* @global.5, align 8
51  store i64 3, i64* @global.1, align 8
52  %tmp25 = add nsw i64 %tmp8, 1
53  %tmp26 = load i64, i64* @global.6, align 8
54  %tmp27 = icmp slt i64 %tmp25, %tmp26
55  br i1 %tmp27, label %bb6, label %bb28
56
57bb28:                                             ; preds = %bb21, %bb6
58  br label %bb29
59
60bb29:                                             ; preds = %bb28, %bb17
61  ret void
62}
63
64define void @zot(i64 %arg, i64 %arg1) local_unnamed_addr {
65bb:
66  %tmp = icmp eq i64 %arg, 0
67  %tmp2 = select i1 %tmp, i64 %arg1, i64 undef
68  %tmp3 = load i64, i64* @global.1, align 8
69  br label %bb4
70
71bb4:                                              ; preds = %bb19, %bb
72  %tmp5 = phi i64 [ 3, %bb19 ], [ %tmp3, %bb ]
73  %tmp6 = phi i64 [ %tmp23, %bb19 ], [ 0, %bb ]
74  %tmp7 = icmp eq i64 %tmp5, %arg
75  br i1 %tmp7, label %bb8, label %bb26
76
77bb8:                                              ; preds = %bb4
78  %tmp9 = icmp eq i64 %tmp5, 0
79  br i1 %tmp9, label %bb19, label %bb10
80
81bb10:                                             ; preds = %bb8
82  %tmp11 = load i64, i64* @global.2, align 8
83  %tmp12 = add nsw i64 %tmp11, 1
84  store i64 %tmp12, i64* @global.2, align 8
85  %tmp13 = load i64, i64* @global.3, align 8
86  %tmp14 = icmp eq i64 %tmp13, %tmp2
87  br i1 %tmp14, label %bb15, label %bb19
88
89bb15:                                             ; preds = %bb10
90  %tmp16 = phi i64 [ %tmp13, %bb10 ]
91  %tmp17 = load i64, i64* @global.4, align 8
92  %tmp18 = add nsw i64 %tmp17, %tmp16
93  store i64 %tmp18, i64* @global.5, align 8
94  br label %bb27
95
96bb19:                                             ; preds = %bb10, %bb8
97  %tmp20 = load i64, i64* @global.3, align 8
98  %tmp21 = load volatile i64, i64* @global, align 8
99  %tmp22 = add nsw i64 %tmp21, %tmp20
100  store i64 %tmp22, i64* @global.5, align 8
101  store i64 3, i64* @global.1, align 8
102  %tmp23 = add nsw i64 %tmp6, 1
103  %tmp24 = load i64, i64* @global.6, align 8
104  %tmp25 = icmp slt i64 %tmp23, %tmp24
105  br i1 %tmp25, label %bb4, label %bb26
106
107bb26:                                             ; preds = %bb19, %bb4
108  br label %bb27
109
110bb27:                                             ; preds = %bb26, %bb15
111  ret void
112}
113
114@global = common global i64 0, align 8
115@global.1 = common global i64 0, align 8
116@global.2 = common global i64 0, align 8
117@global.3 = common global i64 0, align 8
118@global.4 = common global i64 0, align 8
119@global.5 = common global i64 0, align 8
120@global.6 = common global i64 0, align 8
121
122
123