# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -run-pass=machine-scheduler -verify-machineinstrs %s -o - | FileCheck %s

# The sequence of DBG_VALUEs forms a scheduling region with 0 real
# instructions. The RegPressure tracker would end up skipping over any
# debug instructions, so it would point to the instruction
# before/outside of the region, hitting this assert:
#  assert((BotRPTracker.getPos() == RegionEnd ||
#          (RegionEnd->isDebugInstr() &&
#           BotRPTracker.getPos() == priorNonDebug(RegionEnd, RegionBegin))) &&
#         "Can't find the region bottom");

---
name:            only_dbg_value_sched_region
tracksRegLiveness: true
machineFunctionInfo:
  isEntryFunction: true
  waveLimiter:     true
body:             |
  ; CHECK-LABEL: name: only_dbg_value_sched_region
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr0
  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:vreg_64 = IMPLICIT_DEF
  ; CHECK-NEXT:   [[GLOBAL_LOAD_DWORDX2_:%[0-9]+]]:vreg_64 = GLOBAL_LOAD_DWORDX2 [[DEF]], 0, 0, implicit $exec
  ; CHECK-NEXT:   [[GLOBAL_LOAD_DWORD:%[0-9]+]]:vgpr_32 = GLOBAL_LOAD_DWORD [[DEF]], 8, 0, implicit $exec
  ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:vreg_64 = COPY [[GLOBAL_LOAD_DWORDX2_]]
  ; CHECK-NEXT:   undef %6.sub0:vreg_64 = V_ADD_F32_e32 [[DEF]].sub0, [[COPY1]].sub0, implicit $mode, implicit $exec
  ; CHECK-NEXT:   dead undef %6.sub1:vreg_64 = V_ADD_F32_e32 [[DEF]].sub1, [[COPY1]].sub0, implicit $mode, implicit $exec
  ; CHECK-NEXT:   [[GLOBAL_LOAD_DWORD1:%[0-9]+]]:vgpr_32 = GLOBAL_LOAD_DWORD [[COPY1]], 0, 0, implicit $exec
  ; CHECK-NEXT:   undef %4.sub0:vreg_64 = V_MOV_B32_e32 111, implicit $exec
  ; CHECK-NEXT:   [[DEF1:%[0-9]+]]:vreg_64 = IMPLICIT_DEF
  ; CHECK-NEXT:   %4.sub1:vreg_64 = V_ADD_U32_e32 [[COPY]], [[COPY]], implicit $exec
  ; CHECK-NEXT:   undef %19.sub1:vreg_64 = V_ADD_F32_e32 [[GLOBAL_LOAD_DWORD]], [[GLOBAL_LOAD_DWORD]], implicit $mode, implicit $exec
  ; CHECK-NEXT:   %19.sub0:vreg_64 = V_ADD_F32_e32 [[GLOBAL_LOAD_DWORD1]], [[GLOBAL_LOAD_DWORDX2_]].sub0, implicit $mode, implicit $exec
  ; CHECK-NEXT:   GLOBAL_STORE_DWORDX2 %19, %4, 32, 0, implicit $exec
  ; CHECK-NEXT:   undef %11.sub0:vreg_64 = GLOBAL_LOAD_DWORD [[DEF1]], 0, 0, implicit $exec
  ; CHECK-NEXT:   [[DEF2:%[0-9]+]]:vreg_64 = IMPLICIT_DEF
  ; CHECK-NEXT:   [[DEF3:%[0-9]+]]:vreg_64 = IMPLICIT_DEF
  ; CHECK-NEXT:   [[DEF2]].sub0:vreg_64 = GLOBAL_LOAD_DWORD [[DEF3]], 0, 0, implicit $exec
  ; CHECK-NEXT:   %11.sub1:vreg_64 = IMPLICIT_DEF
  ; CHECK-NEXT:   [[DEF4:%[0-9]+]]:vreg_64 = IMPLICIT_DEF
  ; CHECK-NEXT:   [[DEF5:%[0-9]+]]:vreg_64 = IMPLICIT_DEF
  ; CHECK-NEXT:   dead %20:vgpr_32 = GLOBAL_LOAD_DWORD %11, 0, 0, implicit $exec
  ; CHECK-NEXT:   dead %21:vgpr_32 = GLOBAL_LOAD_DWORD [[DEF4]], 0, 0, implicit $exec
  ; CHECK-NEXT:   dead %22:vgpr_32 = GLOBAL_LOAD_DWORD [[DEF5]], 0, 0, implicit $exec
  ; CHECK-NEXT:   [[DEF6:%[0-9]+]]:vgpr_32 = IMPLICIT_DEF
  ; CHECK-NEXT:   [[DEF7:%[0-9]+]]:vgpr_32 = IMPLICIT_DEF
  ; CHECK-NEXT:   [[DEF8:%[0-9]+]]:vgpr_32 = IMPLICIT_DEF
  ; CHECK-NEXT:   [[V_MOV_B32_e32_:%[0-9]+]]:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
  ; CHECK-NEXT:   [[V_LSHLREV_B64_e64_:%[0-9]+]]:vreg_64 = V_LSHLREV_B64_e64 2, [[DEF2]], implicit $exec
  ; CHECK-NEXT:   [[V_MOV_B32_e32_1:%[0-9]+]]:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
  ; CHECK-NEXT:   S_NOP 0, implicit [[DEF7]], implicit [[V_LSHLREV_B64_e64_]].sub0, implicit [[DEF6]], implicit [[V_MOV_B32_e32_]]
  ; CHECK-NEXT:   GLOBAL_STORE_DWORD [[DEF5]], [[V_MOV_B32_e32_1]], 0, 0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.2(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SETREG_IMM32_B32 0, 1, implicit-def $mode, implicit $mode
  ; CHECK-NEXT:   DBG_VALUE
  ; CHECK-NEXT:   DBG_VALUE
  ; CHECK-NEXT:   DBG_VALUE
  ; CHECK-NEXT:   S_SETREG_IMM32_B32 0, 1, implicit-def $mode, implicit $mode
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   S_NOP 0, implicit [[COPY]]
  ; CHECK-NEXT:   S_NOP 0, implicit [[DEF8]]
  ; CHECK-NEXT:   S_ENDPGM 0
  bb.0:
    liveins: $vgpr0

    %0:vgpr_32 = COPY $vgpr0
    %1:vreg_64 = IMPLICIT_DEF
    %2:vreg_64 = GLOBAL_LOAD_DWORDX2 %1, 0, 0, implicit $exec
    %3:vgpr_32 = GLOBAL_LOAD_DWORD %1, 8, 0, implicit $exec
    undef %4.sub1:vreg_64 = V_ADD_U32_e32 %0, %0, implicit $exec
    %4.sub0:vreg_64 = V_MOV_B32_e32 111, implicit $exec
    %5:vreg_64 = COPY %2
    undef %6.sub0:vreg_64 = V_ADD_F32_e32 %1.sub0, %5.sub0, implicit $mode, implicit $exec
    %6.sub1:vreg_64 = V_ADD_F32_e32 %1.sub1, %5.sub0, implicit $mode, implicit $exec
    %7:vgpr_32 = GLOBAL_LOAD_DWORD %5, 0, 0, implicit $exec
    %8:vreg_64 = IMPLICIT_DEF
    %9:vreg_64 = IMPLICIT_DEF
    %10:vreg_64 = IMPLICIT_DEF
    undef %11.sub1:vreg_64 = IMPLICIT_DEF
    %12:vgpr_32 = IMPLICIT_DEF
    %13:vgpr_32 = IMPLICIT_DEF
    %14:vreg_64 = IMPLICIT_DEF
    %15:vreg_64 = IMPLICIT_DEF
    %16:vgpr_32 = IMPLICIT_DEF
    %17:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
    %18:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
    undef %19.sub0:vreg_64 = V_ADD_F32_e32 %7, %2.sub0, implicit $mode, implicit $exec
    %19.sub1:vreg_64 = V_ADD_F32_e32 %3, %3, implicit $mode, implicit $exec
    GLOBAL_STORE_DWORDX2 %19, %4, 32, 0, implicit $exec
    %11.sub0:vreg_64 = GLOBAL_LOAD_DWORD %9, 0, 0, implicit $exec
    %8.sub0:vreg_64 = GLOBAL_LOAD_DWORD %10, 0, 0, implicit $exec
    %20:vgpr_32 = GLOBAL_LOAD_DWORD %11, 0, 0, implicit $exec
    %21:vgpr_32 = GLOBAL_LOAD_DWORD %14, 0, 0, implicit $exec
    %22:vgpr_32 = GLOBAL_LOAD_DWORD %15, 0, 0, implicit $exec
    %23:vreg_64 = V_LSHLREV_B64_e64 2, %8, implicit $exec
    S_NOP 0, implicit %13, implicit %23.sub0, implicit %12, implicit %17
    GLOBAL_STORE_DWORD %15, %18, 0, 0, implicit $exec

  bb.1:
    S_SETREG_IMM32_B32 0, 1, implicit-def $mode, implicit $mode
    DBG_VALUE
    DBG_VALUE
    DBG_VALUE
    S_SETREG_IMM32_B32 0, 1, implicit-def $mode, implicit $mode

  bb.2:
    S_NOP 0, implicit %0
    S_NOP 0, implicit %16
    S_ENDPGM 0

...