1; RUN: opt -S -loop-predication < %s 2>&1 | FileCheck %s
2; RUN: opt -S -passes='require<scalar-evolution>,loop(loop-predication)' < %s 2>&1 | FileCheck %s
3
4declare void @llvm.experimental.guard(i1, ...)
5
6define i32 @test_visited(i32* %array, i32 %length, i32 %n, i32 %x) {
7; CHECK-LABEL: @test_visited
8entry:
9  %tmp5 = icmp eq i32 %n, 0
10  br i1 %tmp5, label %exit, label %loop.preheader
11
12loop.preheader:
13; CHECK: loop.preheader:
14; CHECK: [[iteration_count:[^ ]+]] = add i32 %n, -1
15; CHECK-NEXT: [[wide_cond:[^ ]+]] = icmp ult i32 [[iteration_count]], %length
16; CHECK-NEXT: br label %loop
17  br label %loop
18
19loop:
20; CHECK: loop:
21; CHECK: %unrelated.cond = icmp eq i32 %x, %i
22; CHECK: [[guard_cond:[^ ]+]] = and i1 %unrelated.cond, [[wide_cond]]
23; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[guard_cond]], i32 9) [ "deopt"() ]
24  %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ]
25  %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ]
26  %within.bounds = icmp ult i32 %i, %length
27  %unrelated.cond = icmp eq i32 %x, %i
28  %guard.cond.2 = and i1 %within.bounds, %unrelated.cond
29  %guard.cond.3 = and i1 %guard.cond.2, %unrelated.cond
30  %guard.cond.4 = and i1 %guard.cond.3, %guard.cond.2
31  %guard.cond.5 = and i1 %guard.cond.4, %guard.cond.3
32  %guard.cond.6 = and i1 %guard.cond.5, %guard.cond.4
33  %guard.cond.7 = and i1 %guard.cond.6, %guard.cond.5
34  %guard.cond.8 = and i1 %guard.cond.7, %guard.cond.6
35  %guard.cond.9 = and i1 %guard.cond.8, %guard.cond.7
36  %guard.cond.10 = and i1 %guard.cond.9, %guard.cond.8
37  %guard.cond.11 = and i1 %guard.cond.10, %guard.cond.9
38  %guard.cond.12 = and i1 %guard.cond.11, %guard.cond.10
39  %guard.cond.13 = and i1 %guard.cond.12, %guard.cond.11
40  %guard.cond.14 = and i1 %guard.cond.13, %guard.cond.12
41  %guard.cond.15 = and i1 %guard.cond.14, %guard.cond.13
42  %guard.cond.16 = and i1 %guard.cond.15, %guard.cond.14
43  %guard.cond.17 = and i1 %guard.cond.16, %guard.cond.15
44  %guard.cond.18 = and i1 %guard.cond.17, %guard.cond.16
45  %guard.cond.19 = and i1 %guard.cond.18, %guard.cond.17
46  %guard.cond.20 = and i1 %guard.cond.19, %guard.cond.18
47  %guard.cond.21 = and i1 %guard.cond.20, %guard.cond.19
48  %guard.cond.22 = and i1 %guard.cond.21, %guard.cond.20
49  %guard.cond.23 = and i1 %guard.cond.22, %guard.cond.21
50  %guard.cond.24 = and i1 %guard.cond.23, %guard.cond.22
51  %guard.cond.25 = and i1 %guard.cond.24, %guard.cond.23
52  %guard.cond.26 = and i1 %guard.cond.25, %guard.cond.24
53  %guard.cond.27 = and i1 %guard.cond.26, %guard.cond.25
54  %guard.cond.28 = and i1 %guard.cond.27, %guard.cond.26
55  %guard.cond.29 = and i1 %guard.cond.28, %guard.cond.27
56  %guard.cond.30 = and i1 %guard.cond.29, %guard.cond.28
57  %guard.cond.31 = and i1 %guard.cond.30, %guard.cond.29
58  %guard.cond.32 = and i1 %guard.cond.31, %guard.cond.30
59  %guard.cond.33 = and i1 %guard.cond.32, %guard.cond.31
60  %guard.cond.34 = and i1 %guard.cond.33, %guard.cond.32
61  %guard.cond.35 = and i1 %guard.cond.34, %guard.cond.33
62  %guard.cond.36 = and i1 %guard.cond.35, %guard.cond.34
63  %guard.cond.37 = and i1 %guard.cond.36, %guard.cond.35
64  %guard.cond.38 = and i1 %guard.cond.37, %guard.cond.36
65  %guard.cond.39 = and i1 %guard.cond.38, %guard.cond.37
66  %guard.cond.40 = and i1 %guard.cond.39, %guard.cond.38
67  %guard.cond.41 = and i1 %guard.cond.40, %guard.cond.39
68  %guard.cond.42 = and i1 %guard.cond.41, %guard.cond.40
69  %guard.cond.43 = and i1 %guard.cond.42, %guard.cond.41
70  %guard.cond.44 = and i1 %guard.cond.43, %guard.cond.42
71  %guard.cond.45 = and i1 %guard.cond.44, %guard.cond.43
72  %guard.cond.46 = and i1 %guard.cond.45, %guard.cond.44
73  %guard.cond.47 = and i1 %guard.cond.46, %guard.cond.45
74  %guard.cond.48 = and i1 %guard.cond.47, %guard.cond.46
75  %guard.cond.49 = and i1 %guard.cond.48, %guard.cond.47
76  %guard.cond.50 = and i1 %guard.cond.49, %guard.cond.48
77  %guard.cond.51 = and i1 %guard.cond.50, %guard.cond.49
78  %guard.cond.52 = and i1 %guard.cond.51, %guard.cond.50
79  %guard.cond.53 = and i1 %guard.cond.52, %guard.cond.51
80  %guard.cond.54 = and i1 %guard.cond.53, %guard.cond.52
81  %guard.cond.55 = and i1 %guard.cond.54, %guard.cond.53
82  %guard.cond.56 = and i1 %guard.cond.55, %guard.cond.54
83  %guard.cond.57 = and i1 %guard.cond.56, %guard.cond.55
84  %guard.cond.58 = and i1 %guard.cond.57, %guard.cond.56
85  %guard.cond.59 = and i1 %guard.cond.58, %guard.cond.57
86  %guard.cond.60 = and i1 %guard.cond.59, %guard.cond.58
87  %guard.cond.61 = and i1 %guard.cond.60, %guard.cond.59
88  %guard.cond.62 = and i1 %guard.cond.61, %guard.cond.60
89  %guard.cond.63 = and i1 %guard.cond.62, %guard.cond.61
90  %guard.cond.64 = and i1 %guard.cond.63, %guard.cond.62
91  %guard.cond.65 = and i1 %guard.cond.64, %guard.cond.63
92  %guard.cond.66 = and i1 %guard.cond.65, %guard.cond.64
93  %guard.cond.67 = and i1 %guard.cond.66, %guard.cond.65
94  %guard.cond.68 = and i1 %guard.cond.67, %guard.cond.66
95  %guard.cond.69 = and i1 %guard.cond.68, %guard.cond.67
96  %guard.cond.70 = and i1 %guard.cond.69, %guard.cond.68
97  %guard.cond.71 = and i1 %guard.cond.70, %guard.cond.69
98  %guard.cond.72 = and i1 %guard.cond.71, %guard.cond.70
99  %guard.cond.73 = and i1 %guard.cond.72, %guard.cond.71
100  %guard.cond.74 = and i1 %guard.cond.73, %guard.cond.72
101  %guard.cond.75 = and i1 %guard.cond.74, %guard.cond.73
102  %guard.cond.76 = and i1 %guard.cond.75, %guard.cond.74
103  %guard.cond.77 = and i1 %guard.cond.76, %guard.cond.75
104  %guard.cond.78 = and i1 %guard.cond.77, %guard.cond.76
105  %guard.cond.79 = and i1 %guard.cond.78, %guard.cond.77
106  %guard.cond.80 = and i1 %guard.cond.79, %guard.cond.78
107  %guard.cond.81 = and i1 %guard.cond.80, %guard.cond.79
108  %guard.cond.82 = and i1 %guard.cond.81, %guard.cond.80
109  %guard.cond.83 = and i1 %guard.cond.82, %guard.cond.81
110  %guard.cond.84 = and i1 %guard.cond.83, %guard.cond.82
111  %guard.cond.85 = and i1 %guard.cond.84, %guard.cond.83
112  %guard.cond.86 = and i1 %guard.cond.85, %guard.cond.84
113  %guard.cond.87 = and i1 %guard.cond.86, %guard.cond.85
114  %guard.cond.88 = and i1 %guard.cond.87, %guard.cond.86
115  %guard.cond.89 = and i1 %guard.cond.88, %guard.cond.87
116  %guard.cond.90 = and i1 %guard.cond.89, %guard.cond.88
117  %guard.cond.91 = and i1 %guard.cond.90, %guard.cond.89
118  %guard.cond.92 = and i1 %guard.cond.91, %guard.cond.90
119  %guard.cond.93 = and i1 %guard.cond.92, %guard.cond.91
120  %guard.cond.94 = and i1 %guard.cond.93, %guard.cond.92
121  %guard.cond.95 = and i1 %guard.cond.94, %guard.cond.93
122  %guard.cond.96 = and i1 %guard.cond.95, %guard.cond.94
123  %guard.cond.97 = and i1 %guard.cond.96, %guard.cond.95
124  %guard.cond.98 = and i1 %guard.cond.97, %guard.cond.96
125  %guard.cond.99 = and i1 %guard.cond.98, %guard.cond.97
126  call void (i1, ...) @llvm.experimental.guard(i1 %guard.cond.99, i32 9) [ "deopt"() ]
127
128  %i.i64 = zext i32 %i to i64
129  %array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
130  %array.i = load i32, i32* %array.i.ptr, align 4
131  %loop.acc.next = add i32 %loop.acc, %array.i
132
133  %i.next = add nuw i32 %i, 1
134  %continue = icmp ult i32 %i.next, %n
135  br i1 %continue, label %loop, label %exit
136
137exit:
138  %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ]
139  ret i32 %result
140}