; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -march=amdgcn -mcpu=gfx1010 | FileCheck %s --check-prefix=GCN

define void @vgpr_descriptor_waterfall_loop_idom_update(<4 x i32>* %arg) {
; GCN-LABEL: vgpr_descriptor_waterfall_loop_idom_update:
; GCN:       ; %bb.0: ; %entry
; GCN-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GCN-NEXT:    s_waitcnt_vscnt null, 0x0
; GCN-NEXT:    ; implicit-def: $vcc_hi
; GCN-NEXT:  BB0_1: ; %bb0
; GCN-NEXT:    ; =>This Loop Header: Depth=1
; GCN-NEXT:    ; Child Loop BB0_2 Depth 2
; GCN-NEXT:    v_add_co_u32_e64 v2, vcc_lo, v0, 8
; GCN-NEXT:    s_mov_b32 s5, exec_lo
; GCN-NEXT:    v_add_co_ci_u32_e32 v3, vcc_lo, 0, v1, vcc_lo
; GCN-NEXT:    flat_load_dwordx2 v[2:3], v[2:3]
; GCN-NEXT:    flat_load_dwordx2 v[4:5], v[0:1]
; GCN-NEXT:  BB0_2: ; Parent Loop BB0_1 Depth=1
; GCN-NEXT:    ; => This Inner Loop Header: Depth=2
; GCN-NEXT:    s_waitcnt vmcnt(0) lgkmcnt(0)
; GCN-NEXT:    v_readfirstlane_b32 s8, v4
; GCN-NEXT:    v_readfirstlane_b32 s9, v5
; GCN-NEXT:    v_readfirstlane_b32 s10, v2
; GCN-NEXT:    v_readfirstlane_b32 s11, v3
; GCN-NEXT:    v_cmp_eq_u64_e32 vcc_lo, s[8:9], v[4:5]
; GCN-NEXT:    v_cmp_eq_u64_e64 s4, s[10:11], v[2:3]
; GCN-NEXT:    s_and_b32 s4, vcc_lo, s4
; GCN-NEXT:    s_and_saveexec_b32 s4, s4
; GCN-NEXT:    s_nop 0
; GCN-NEXT:    buffer_store_dword v0, v0, s[8:11], 0 offen
; GCN-NEXT:    v_nop
; GCN-NEXT:    s_xor_b32 exec_lo, exec_lo, s4
; GCN-NEXT:    s_cbranch_execnz BB0_2
; GCN-NEXT:  ; %bb.3: ; in Loop: Header=BB0_1 Depth=1
; GCN-NEXT:    s_mov_b32 exec_lo, s5
; GCN-NEXT:    s_branch BB0_1
entry:
  br label %bb0

bb0:
  %desc = load <4 x i32>, <4 x i32>* %arg, align 8
  tail call void @llvm.amdgcn.buffer.store.f32(float undef, <4 x i32> %desc, i32 0, i32 undef, i1 zeroext false, i1 zeroext false)
  br label %bb0
}

; Function Attrs: nounwind writeonly
declare void @llvm.amdgcn.buffer.store.f32(float, <4 x i32>, i32, i32, i1 immarg, i1 immarg)