1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt -S -instcombine -instcombine-infinite-loop-threshold=2 < %s | FileCheck %s
4 ; This used to cause on infinite instcombine loop.
6 define void @test(i1 %c) {
9 ; CHECK-NEXT: br i1 [[C:%.*]], label [[BB17:%.*]], label [[BB24:%.*]]
11 ; CHECK-NEXT: [[TMP0:%.*]] = phi i8* [ [[TMP1:%.*]], [[BB47:%.*]] ], [ undef, [[BB16:%.*]] ]
12 ; CHECK-NEXT: store i8* [[TMP0]], i8** undef, align 8
13 ; CHECK-NEXT: ret void
15 ; CHECK-NEXT: br i1 [[C]], label [[BB44:%.*]], label [[BB49:%.*]]
17 ; CHECK-NEXT: [[TMP467:%.*]] = load i8*, i8** inttoptr (i64 16 to i8**), align 16
18 ; CHECK-NEXT: br label [[BB47]]
20 ; CHECK-NEXT: [[TMP1]] = phi i8* [ [[TMP2:%.*]], [[BB150:%.*]] ], [ [[TMP1221:%.*]], [[BB119:%.*]] ], [ [[TMP1032:%.*]], [[BB101:%.*]] ], [ [[TMP933:%.*]], [[BB91:%.*]] ], [ [[TMP834:%.*]], [[BB81:%.*]] ], [ [[TMP705:%.*]], [[BB67:%.*]] ], [ [[TMP586:%.*]], [[BB56:%.*]] ], [ [[TMP467]], [[BB44]] ]
21 ; CHECK-NEXT: br label [[BB17]]
23 ; CHECK-NEXT: br i1 [[C]], label [[BB56]], label [[BB59:%.*]]
25 ; CHECK-NEXT: [[TMP586]] = load i8*, i8** inttoptr (i64 16 to i8**), align 16
26 ; CHECK-NEXT: br label [[BB47]]
28 ; CHECK-NEXT: br i1 [[C]], label [[BB67]], label [[BB71:%.*]]
30 ; CHECK-NEXT: [[TMP705]] = load i8*, i8** inttoptr (i64 16 to i8**), align 16
31 ; CHECK-NEXT: br label [[BB47]]
33 ; CHECK-NEXT: br i1 [[C]], label [[BB81]], label [[BB84:%.*]]
35 ; CHECK-NEXT: [[TMP834]] = load i8*, i8** inttoptr (i64 16 to i8**), align 16
36 ; CHECK-NEXT: br label [[BB47]]
38 ; CHECK-NEXT: br i1 [[C]], label [[BB91]], label [[BB94:%.*]]
40 ; CHECK-NEXT: [[TMP933]] = load i8*, i8** inttoptr (i64 16 to i8**), align 16
41 ; CHECK-NEXT: br label [[BB47]]
43 ; CHECK-NEXT: br i1 [[C]], label [[BB101]], label [[BB104:%.*]]
45 ; CHECK-NEXT: [[TMP1032]] = load i8*, i8** inttoptr (i64 16 to i8**), align 16
46 ; CHECK-NEXT: br label [[BB47]]
48 ; CHECK-NEXT: br i1 [[C]], label [[BB119]], label [[BB123:%.*]]
50 ; CHECK-NEXT: [[TMP1221]] = load i8*, i8** inttoptr (i64 16 to i8**), align 16
51 ; CHECK-NEXT: br label [[BB47]]
53 ; CHECK-NEXT: br i1 [[C]], label [[BB147:%.*]], label [[BB152:%.*]]
55 ; CHECK-NEXT: [[TMP1499:%.*]] = load i8*, i8** inttoptr (i64 16 to i8**), align 16
56 ; CHECK-NEXT: br label [[BB150]]
58 ; CHECK-NEXT: [[TMP2]] = phi i8* [ [[TMP1848:%.*]], [[BB152]] ], [ [[TMP1499]], [[BB147]] ]
59 ; CHECK-NEXT: br label [[BB47]]
61 ; CHECK-NEXT: [[TMP1848]] = load i8*, i8** inttoptr (i64 16 to i8**), align 16
62 ; CHECK-NEXT: store i1 true, i1* undef, align 1
63 ; CHECK-NEXT: br label [[BB150]]
66 br i1 %c, label %bb17, label %bb24
68 bb17: ; preds = %bb47, %bb17
69 %0 = phi i8* [ %1, %bb47 ], [ undef, %bb16 ]
70 store i8* %0, i8** undef, align 8
74 br i1 %c, label %bb44, label %bb49
77 %tmp46 = load i64*, i64** inttoptr (i64 16 to i64**), align 16
80 bb47: ; preds = %bb150, %bb119, %bb101, %bb91, %bb81, %bb67, %bb56, %bb44
81 %.in1 = phi i64* [ %.in, %bb150 ], [ %tmp122, %bb119 ], [ %tmp103, %bb101 ], [ %tmp93, %bb91 ], [ %tmp83, %bb81 ], [ %tmp70, %bb67 ], [ %tmp58, %bb56 ], [ %tmp46, %bb44 ]
82 %1 = bitcast i64* %.in1 to i8*
86 br i1 %c, label %bb56, label %bb59
89 %tmp58 = load i64*, i64** inttoptr (i64 16 to i64**), align 16
93 br i1 %c, label %bb67, label %bb71
96 %tmp70 = load i64*, i64** inttoptr (i64 16 to i64**), align 16
100 br i1 %c, label %bb81, label %bb84
102 bb81: ; preds = %bb80
103 %tmp83 = load i64*, i64** inttoptr (i64 16 to i64**), align 16
106 bb84: ; preds = %bb84
107 br i1 %c, label %bb91, label %bb94
109 bb91: ; preds = %bb90
110 %tmp93 = load i64*, i64** inttoptr (i64 16 to i64**), align 16
113 bb94: ; preds = %bb94
114 br i1 %c, label %bb101, label %bb104
116 bb101: ; preds = %bb100
117 %tmp103 = load i64*, i64** inttoptr (i64 16 to i64**), align 16
120 bb104: ; preds = %bb104
121 br i1 %c, label %bb119, label %bb123
123 bb119: ; preds = %bb118
124 %tmp122 = load i64*, i64** inttoptr (i64 16 to i64**), align 16
127 bb123: ; preds = %bb123
128 br i1 %c, label %bb147, label %bb152
130 bb147: ; preds = %bb146
131 %tmp149 = load i64*, i64** inttoptr (i64 16 to i64**), align 16
134 bb150: ; preds = %bb152, %bb147
135 %.in = phi i64* [ %tmp184, %bb152 ], [ %tmp149, %bb147 ]
138 bb152: ; preds = %bb146
139 %tmp184 = load i64*, i64** inttoptr (i64 16 to i64**), align 16
144 ; This used to cause an instcombine loop when the problem above was
145 ; addressed in a non-robust fashion.
151 define void @test_2(i1 %c) local_unnamed_addr {
152 ; CHECK-LABEL: @test_2(
154 ; CHECK-NEXT: br label [[WHILE_COND:%.*]]
156 ; CHECK-NEXT: br label [[FOR_COND:%.*]]
158 ; CHECK-NEXT: br i1 [[C:%.*]], label [[COND_TRUE133:%.*]], label [[COND_FALSE138:%.*]]
159 ; CHECK: cond.true133:
160 ; CHECK-NEXT: br label [[COND_END144:%.*]]
161 ; CHECK: cond.false138:
162 ; CHECK-NEXT: store %type_2* poison, %type_2** null, align 536870912
163 ; CHECK-NEXT: br label [[COND_END144]]
164 ; CHECK: cond.end144:
165 ; CHECK-NEXT: br label [[WHILE_COND]]
170 while.cond: ; preds = %cond.end144, %entry
171 %link.0 = phi %type_2* [ undef, %entry ], [ %cond145, %cond.end144 ]
172 %os115 = bitcast %type_2* %link.0 to %type_3*
173 %ou116 = getelementptr inbounds %type_3, %type_3* %os115, i32 0
174 %os1117 = bitcast %type_3* %ou116 to %type_1*
177 for.cond: ; preds = %while.cond
178 br i1 %c, label %cond.true133, label %cond.false138
180 cond.true133: ; preds = %sw.epilog
181 %0 = load %type_2*, %type_2** undef, align 8
182 br label %cond.end144
184 cond.false138: ; preds = %sw.epilog
185 %1 = load %type_2*, %type_2** undef, align 8
186 br label %cond.end144
188 cond.end144: ; preds = %cond.false138, %cond.true133
189 %cond145 = phi %type_2* [ %0, %cond.true133 ], [ %1, %cond.false138 ]