1; RUN: llc -verify-machineinstrs -o /dev/null %s
2; Check that renameDisconnectedComponents() does not create vregs without a
3; definition on every path (there should at least be IMPLICIT_DEF instructions).
4target triple = "amdgcn--"
5
6define void @func() {
7B0:
8  br i1 undef, label %B1, label %B2
9
10B1:
11  br label %B2
12
13B2:
14  %v0 = phi <4 x float> [ zeroinitializer, %B1 ], [ <float 0.0, float 0.0, float 0.0, float undef>, %B0 ]
15  br i1 undef, label %B20.1, label %B20.2
16
17B20.1:
18  br label %B20.2
19
20B20.2:
21  %v2 = phi <4 x float> [ zeroinitializer, %B20.1 ], [ %v0, %B2 ]
22  br i1 undef, label %B30.1, label %B30.2
23
24B30.1:
25  %sub = fsub <4 x float> %v2, undef
26  br label %B30.2
27
28B30.2:
29  %v3 = phi <4 x float> [ %sub, %B30.1 ], [ %v2, %B20.2 ]
30  %ve0 = extractelement <4 x float> %v3, i32 0
31  store float %ve0, float addrspace(3)* undef, align 4
32  ret void
33}
34