1; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=hawaii < %s | FileCheck -enable-var-scope -check-prefix=GCN %s
2
3; A call should be skipped if all lanes are zero, since we don't know
4; what side effects should be avoided inside the call.
5define hidden void @func() #1 {
6  ret void
7}
8
9; GCN-LABEL: {{^}}if_call:
10; GCN: s_and_saveexec_b64
11; GCN-NEXT: s_cbranch_execz [[END:BB[0-9]+_[0-9]+]]
12; GCN: s_swappc_b64
13; GCN: [[END]]:
14define void @if_call(i32 %flag) #0 {
15  %cc = icmp eq i32 %flag, 0
16  br i1 %cc, label %call, label %end
17
18call:
19  call void @func()
20  br label %end
21
22end:
23  ret void
24}
25
26; GCN-LABEL: {{^}}if_asm:
27; GCN: s_and_saveexec_b64
28; GCN-NEXT: s_cbranch_execz [[END:BB[0-9]+_[0-9]+]]
29; GCN: ; sample asm
30; GCN: [[END]]:
31define void @if_asm(i32 %flag) #0 {
32  %cc = icmp eq i32 %flag, 0
33  br i1 %cc, label %call, label %end
34
35call:
36  call void asm sideeffect "; sample asm", ""()
37  br label %end
38
39end:
40  ret void
41}
42
43; GCN-LABEL: {{^}}if_call_kernel:
44; GCN: s_and_saveexec_b64
45; GCN-NEXT: s_cbranch_execz BB3_2
46; GCN: s_swappc_b64
47define amdgpu_kernel void @if_call_kernel() #0 {
48  %id = call i32 @llvm.amdgcn.workitem.id.x()
49  %cc = icmp eq i32 %id, 0
50  br i1 %cc, label %call, label %end
51
52call:
53  call void @func()
54  br label %end
55
56end:
57  ret void
58}
59
60declare i32 @llvm.amdgcn.workitem.id.x() #2
61
62attributes #0 = { nounwind }
63attributes #1 = { nounwind noinline }
64attributes #2 = { nounwind readnone speculatable }
65