1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -gvn -S | FileCheck %s
3
4; This test checks that we don't hang trying to split a critical edge in loadpre
5; when the control flow uses a callbr instruction.
6
7%struct.pluto = type <{ i8, i8 }>
8
9define void @widget(%struct.pluto** %tmp1) {
10; CHECK-LABEL: @widget(
11; CHECK-NEXT:  bb:
12; CHECK-NEXT:    callbr void asm sideeffect "", "X,X"(i8* blockaddress(@widget, [[BB5:%.*]]), i8* blockaddress(@widget, [[BB8:%.*]]))
13; CHECK-NEXT:    to label [[BB4:%.*]] [label [[BB5]], label %bb8]
14; CHECK:       bb4:
15; CHECK-NEXT:    br label [[BB5]]
16; CHECK:       bb5:
17; CHECK-NEXT:    [[TMP6:%.*]] = load %struct.pluto*, %struct.pluto** [[TMP1:%.*]]
18; CHECK-NEXT:    [[TMP7:%.*]] = getelementptr inbounds [[STRUCT_PLUTO:%.*]], %struct.pluto* [[TMP6]], i64 0, i32 1
19; CHECK-NEXT:    br label [[BB8]]
20; CHECK:       bb8:
21; CHECK-NEXT:    [[TMP9:%.*]] = phi i8* [ [[TMP7]], [[BB5]] ], [ null, [[BB:%.*]] ]
22; CHECK-NEXT:    [[TMP10:%.*]] = load %struct.pluto*, %struct.pluto** [[TMP1]]
23; CHECK-NEXT:    [[TMP11:%.*]] = getelementptr inbounds [[STRUCT_PLUTO]], %struct.pluto* [[TMP10]], i64 0, i32 0
24; CHECK-NEXT:    [[TMP12:%.*]] = load i8, i8* [[TMP11]]
25; CHECK-NEXT:    tail call void @spam(i8* [[TMP9]], i8 [[TMP12]])
26; CHECK-NEXT:    ret void
27;
28bb:
29  callbr void asm sideeffect "", "X,X"(i8* blockaddress(@widget, %bb5), i8* blockaddress(@widget, %bb8))
30  to label %bb4 [label %bb5, label %bb8]
31
32bb4:                                              ; preds = %bb
33  br label %bb5
34
35bb5:                                              ; preds = %bb4, %bb
36  %tmp6 = load %struct.pluto*, %struct.pluto** %tmp1
37  %tmp7 = getelementptr inbounds %struct.pluto, %struct.pluto* %tmp6, i64 0, i32 1
38  br label %bb8
39
40bb8:                                              ; preds = %bb5, %bb
41  %tmp9 = phi i8* [ %tmp7, %bb5 ], [ null, %bb ]
42  %tmp10 = load %struct.pluto*, %struct.pluto** %tmp1
43  %tmp11 = getelementptr inbounds %struct.pluto, %struct.pluto* %tmp10, i64 0, i32 0
44  %tmp12 = load i8, i8* %tmp11
45  tail call void @spam(i8* %tmp9, i8 %tmp12)
46  ret void
47}
48
49declare void @spam(i8*, i8)
50