1; RUN: opt -mtriple amdgcn-unknown-amdhsa -analyze -divergence -use-gpu-divergence-analysis %s | FileCheck %s
2
3define amdgpu_kernel void @hidden_diverge(i32 %n, i32 %a, i32 %b) #0 {
4; CHECK-LABEL: Printing analysis 'Legacy Divergence Analysis' for function 'hidden_diverge'
5entry:
6  %tid = call i32 @llvm.amdgcn.workitem.id.x()
7  %cond.var = icmp slt i32 %tid, 0
8  br i1 %cond.var, label %B, label %C ; divergent
9; CHECK: DIVERGENT: br i1 %cond.var,
10B:
11  %cond.uni = icmp slt i32 %n, 0
12  br i1 %cond.uni, label %C, label %merge ; uniform
13; CHECK-NOT: DIVERGENT: br i1 %cond.uni,
14C:
15  %phi.var.hidden = phi i32 [ 1, %entry ], [ 2, %B  ]
16; CHECK: DIVERGENT: %phi.var.hidden = phi i32
17  br label %merge
18merge:
19  %phi.ipd = phi i32 [ %a, %B ], [ %b, %C ]
20; CHECK: DIVERGENT: %phi.ipd = phi i32
21  ret void
22}
23
24define amdgpu_kernel void @hidden_loop_ipd(i32 %n, i32 %a, i32 %b) #0 {
25; CHECK-LABEL: Printing analysis 'Legacy Divergence Analysis' for function 'hidden_loop_ipd'
26entry:
27  %tid = call i32 @llvm.amdgcn.workitem.id.x()
28  %cond.var = icmp slt i32 %tid, 0
29; CHECK: DIVERGENT: %cond.var = icmp
30  %cond.uni = icmp slt i32 %n, 0
31; CHECK-NOT: DIVERGENT: %cond.uni = icmp
32  br label %for.header
33for.header:
34  br i1 %cond.var, label %A, label %B
35A:
36  br label %C
37B:
38  br label %C
39C:
40  br i1 %cond.uni, label %E, label %D
41D:
42  br i1 %cond.var, label %for.header, label %F
43
44E:
45  %e.lcssa.uni = phi i32 [ 0, %C ]
46; CHECK-NOT: DIVERGENT: %e.lcssa.uni = phi i32
47  br label %G
48
49F:
50  %f.lcssa.uni = phi i32 [ 1, %D ]
51; CHECK-NOT: DIVERGENT: %f.lcssa.uni = phi i32
52  br label %G
53
54G:
55  %g.join.var = phi i32 [ %e.lcssa.uni, %E ], [ %f.lcssa.uni, %F ]
56; CHECK: DIVERGENT: %g.join.var = phi i32
57  ret void
58}
59
60
61declare i32 @llvm.amdgcn.workitem.id.x() #0
62
63attributes #0 = { nounwind readnone }
64