1; RUN: opt -mtriple=amdgcn-- -S -structurizecfg -si-annotate-control-flow %s | FileCheck -check-prefix=OPT %s
2; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
3
4
5; OPT-LABEL: @annotate_unreachable(
6; OPT: call { i1, i64 } @llvm.amdgcn.if.i64(
7; OPT-NOT: call void @llvm.amdgcn.end.cf
8
9
10; GCN-LABEL: {{^}}annotate_unreachable:
11; GCN: s_and_saveexec_b64
12; GCN-NOT: s_endpgm
13; GCN: .Lfunc_end0
14define amdgpu_kernel void @annotate_unreachable(<4 x float> addrspace(1)* noalias nocapture readonly %arg) #0 {
15bb:
16  %tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
17  br label %bb1
18
19bb1:                                              ; preds = %bb
20  %tmp2 = sext i32 %tmp to i64
21  %tmp3 = getelementptr inbounds <4 x float>, <4 x float> addrspace(1)* %arg, i64 %tmp2
22  %tmp4 = load <4 x float>, <4 x float> addrspace(1)* %tmp3, align 16
23  br i1 undef, label %bb3, label %bb5  ; label order reversed
24
25bb3:                                              ; preds = %bb1
26  %tmp6 = extractelement <4 x float> %tmp4, i32 2
27  %tmp7 = fcmp olt float %tmp6, 0.000000e+00
28  br i1 %tmp7, label %bb4, label %bb5
29
30bb4:                                              ; preds = %bb3
31  unreachable
32
33bb5:                                              ; preds = %bb3, %bb1
34  unreachable
35}
36
37declare i32 @llvm.amdgcn.workitem.id.x() #1
38
39attributes #0 = { nounwind }
40attributes #1 = { nounwind readnone }
41