1; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck %s
2
3; The branch instruction in LOOP49 has a uniform condition, but PHI instructions
4; introduced by the structurizecfg pass previously caused a false divergence
5; which ended up in an assertion (or incorrect code) because
6; SIAnnotateControlFlow and structurizecfg had different ideas about which
7; branches are uniform.
8;
9; CHECK-LABEL: {{^}}main:
10; CHECK: ; %LOOP49
11; CHECK: v_cmp_ne_u32_e32 vcc,
12; CHECK: s_cbranch_vccnz
13; CHECK: ; %ENDIF53
14define amdgpu_vs float @main(i32 %in) {
15main_body:
16  %cmp = mul i32 %in, 2
17  br label %LOOP
18
19LOOP:                                             ; preds = %ENDLOOP48, %main_body
20  %counter = phi i32 [ 0, %main_body ], [ %counter.next, %ENDLOOP48 ]
21  %v.LOOP = phi i32 [ 0, %main_body ], [ %v.ENDLOOP48, %ENDLOOP48 ]
22  %tmp7 = icmp slt i32 %cmp, %counter
23  br i1 %tmp7, label %IF, label %LOOP49
24
25IF:                                               ; preds = %LOOP
26  %r = bitcast i32 %v.LOOP to float
27  ret float %r
28
29LOOP49:                                           ; preds = %LOOP
30  %tmp8 = icmp ne i32 %counter, 0
31  br i1 %tmp8, label %ENDLOOP48, label %ENDIF53
32
33ENDLOOP48:                                        ; preds = %ENDIF53, %LOOP49
34  %v.ENDLOOP48 = phi i32 [ %v.LOOP, %LOOP49 ], [ %v.ENDIF53, %ENDIF53 ]
35  %counter.next = add i32 %counter, 1
36  br label %LOOP
37
38ENDIF53:                                          ; preds = %LOOP49
39  %v.ENDIF53 = add i32 %v.LOOP, %counter
40  br label %ENDLOOP48
41}
42