llvm/test/CodeGen/AMDGPU/schedule-regpressure.mir

# RUN: llc -mtriple=amdgcn -misched=converge -run-pass machine-scheduler %s -o - -debug-only=machine-scheduler 2>&1 | FileCheck %s
# RUN: llc -mtriple=amdgcn -misched-regpressure=false -run-pass machine-scheduler %s -o - -debug-only=machine-scheduler 2>&1 | FileCheck %s --check-prefix=NORP

# REQUIRES: asserts

# Check there is no SReg_32 pressure created by DS_* instructions because of M0 use

# CHECK: ScheduleDAGMILive::schedule starting
# CHECK: SU({{.*}} = DS_READ_B32 {{.*}} implicit $m0, implicit $exec
# CHECK: Pressure Diff : {{$}}
# CHECK: SU({{.*}} DS_WRITE_B32

# NORP: ScheduleDAGMILive::schedule starting
# NORP: GenericScheduler RegionPolicy:  ShouldTrackPressure=0
# NORP-NOT: Pressure Diff : {{$}}
# NORP-NOT: Pressure Diff : {{$}}
# NORP-NOT: Pressure Diff : {{$}}
# NORP-NOT: Pressure Diff : {{$}}
# NORP-NOT: Pressure Diff : {{$}}
# NORP-NOT: Pressure Diff : {{$}}
# NORP-NOT: Bottom Pressure:
# NORP-NOT: UpdateRegP
# NORP-NOT: UpdateRegP
# NORP-NOT: UpdateRegP

---
name:            mo_pset
alignment:       1
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
tracksRegLiveness: true
registers:
  - { id: 0, class: sgpr_128 }
  - { id: 1, class: sgpr_64 }
  - { id: 2, class: sreg_32_xm0 }
  - { id: 3, class: sgpr_32 }
  - { id: 4, class: vgpr_32 }
  - { id: 5, class: sreg_32_xm0_xexec }
  - { id: 6, class: vgpr_32 }
  - { id: 7, class: vgpr_32 }
  - { id: 8, class: vgpr_32 }
liveins:
  - { reg: '$sgpr4_sgpr5', virtual-reg: '%1' }
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    0
  adjustsStack:    false
  hasCalls:        false
  maxCallFrameSize: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
body:             |
  bb.0:
    liveins: $sgpr4_sgpr5

    %1 = COPY $sgpr4_sgpr5
    %5 = S_LOAD_DWORD_IMM %1, 0, 0 :: (non-temporal dereferenceable invariant load (s32) from `ptr addrspace(4) poison`)
    $m0 = S_MOV_B32 -1
    %7 = COPY %5
    %6 = DS_READ_B32 %7, 0, 0, implicit $m0, implicit $exec
    DS_WRITE_B32 %7, %6, 4, 0, implicit killed $m0, implicit $exec
    S_ENDPGM 0

...