1; RUN: llc -mtriple=amdgcn-- -verify-machineinstrs -o /dev/null %s
2; This testcase produces a situation with unused value numbers in subregister
3; liveranges that get distributed by ConnectedVNInfoEqClasses.
4
5define amdgpu_kernel void @hoge() {
6bb:
7  %tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
8  br i1 undef, label %bb2, label %bb23
9
10bb2:
11  br i1 undef, label %bb6, label %bb8
12
13bb6:
14  %tmp7 = or i64 undef, undef
15  br label %bb8
16
17bb8:
18  %tmp9 = phi i64 [ %tmp7, %bb6 ], [ undef, %bb2 ]
19  %tmp10 = icmp eq i32 %tmp, 0
20  br i1 %tmp10, label %bb11, label %bb23
21
22bb11:
23  br i1 undef, label %bb20, label %bb17
24
25bb17:
26  br label %bb20
27
28bb20:
29  %tmp21 = phi i64 [ undef, %bb17 ], [ %tmp9, %bb11 ]
30  %tmp22 = trunc i64 %tmp21 to i32
31  br label %bb23
32
33bb23:
34  %tmp24 = phi i32 [ %tmp22, %bb20 ], [ undef, %bb8 ], [ undef, %bb ]
35  br label %bb25
36
37bb25:
38  %tmp26 = phi i32 [ %tmp24, %bb23 ], [ undef, %bb25 ]
39  br i1 undef, label %bb25, label %bb30
40
41bb30:
42  br i1 undef, label %bb32, label %bb34
43
44bb32:
45  %tmp33 = zext i32 %tmp26 to i64
46  br label %bb34
47
48bb34:
49  ret void
50}
51
52declare i32 @llvm.amdgcn.workitem.id.x()
53