1; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
2
3; There was an infinite loop in DAGCombiner from a target build_vector
4; combine and a generic insert_vector_elt combine.
5
6; GCN-LABEL: {{^}}combine_loop:
7; GCN: flat_load_ushort
8; GCN: flat_store_short
9; GCN: v_lshlrev_b32_e32 v{{[0-9]+}}, 16,
10define amdgpu_kernel void @combine_loop(i16* %arg) #0 {
11bb:
12  br label %bb1
13
14bb1:
15  %tmp = phi <2 x i16> [ <i16 15360, i16 15360>, %bb ], [ %tmp5, %bb1 ]
16  %tmp2 = phi half [ 0xH0000, %bb ], [ %tmp8, %bb1 ]
17  %tmp3 = load volatile half, half* null, align 536870912
18  %tmp4 = bitcast half %tmp3 to i16
19  %tmp5 = insertelement <2 x i16> <i16 0, i16 undef>, i16 %tmp4, i32 1
20  %tmp6 = bitcast i16* %arg to half*
21  store half %tmp2, half* %tmp6, align 2
22  %tmp7 = bitcast <2 x i16> %tmp to <2 x half>
23  %tmp8 = extractelement <2 x half> %tmp7, i32 0
24  br label %bb1
25}
26
27attributes #0 = { nounwind }
28