xref: /aosp_15_r20/external/llvm/test/Analysis/DivergenceAnalysis/AMDGPU/phi-undef.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58)
1; RUN: opt -mtriple=amdgcn-- -analyze -divergence %s | FileCheck %s
2
3; CHECK-LABEL: 'test1':
4; CHECK-NEXT: DIVERGENT: i32 %bound
5; CHECK-NEXT: DIVERGENT: %break = icmp sge i32 %counter, %bound
6; CHECK-NEXT: DIVERGENT: br i1 %break, label %footer, label %body
7; CHECK-NEXT: DIVERGENT: br i1 %break, label %end, label %header
8; Note: %counter is not divergent!
9define amdgpu_ps void @test1(i32 %bound) {
10entry:
11  br label %header
12
13header:
14  %counter = phi i32 [ 0, %entry ], [ %counter.footer, %footer ]
15  %break = icmp sge i32 %counter, %bound
16  br i1 %break, label %footer, label %body
17
18body:
19  %counter.next = add i32 %counter, 1
20  br label %footer
21
22footer:
23  %counter.footer = phi i32 [ %counter.next, %body ], [ undef, %header ]
24  br i1 %break, label %end, label %header
25
26end:
27  ret void
28}
29