third_party/llvm-7.0/llvm/test/CodeGen/AMDGPU/hazard.mir

# RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs -run-pass post-RA-hazard-rec %s -o - | FileCheck -check-prefix=GCN -check-prefix=VI %s
# RUN: llc -march=amdgcn -mcpu=gfx900 -verify-machineinstrs -run-pass post-RA-hazard-rec %s -o - | FileCheck -check-prefix=GCN -check-prefix=GFX9 %s

# GCN-LABEL: name: hazard_implicit_def
# GCN:    bb.0.entry:
# GCN:      $m0 = S_MOV_B32
# GFX9:     S_NOP 0
# VI-NOT:   S_NOP_0
# GCN:      V_INTERP_P1_F32

---
name:            hazard_implicit_def
alignment:       0
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
tracksRegLiveness: true
registers:
liveins:
  - { reg: '$sgpr7', virtual-reg: '' }
  - { reg: '$vgpr4', virtual-reg: '' }
body:             |
  bb.0.entry:
    liveins: $sgpr7, $vgpr4

    $m0 = S_MOV_B32 killed $sgpr7
    $vgpr5 = IMPLICIT_DEF
    $vgpr0 = V_INTERP_P1_F32 killed $vgpr4, 0, 0, implicit $m0, implicit $exec
    SI_RETURN_TO_EPILOG killed $vgpr5, killed $vgpr0

...

# GCN-LABEL: name: hazard_inlineasm
# GCN:    bb.0.entry:
# GCN:      $m0 = S_MOV_B32
# GFX9:     S_NOP 0
# VI-NOT:   S_NOP_0
# GCN:      V_INTERP_P1_F32
---
name:            hazard_inlineasm
alignment:       0
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
tracksRegLiveness: true
registers:
liveins:
  - { reg: '$sgpr7', virtual-reg: '' }
  - { reg: '$vgpr4', virtual-reg: '' }
body:             |
  bb.0.entry:
    liveins: $sgpr7, $vgpr4

    $m0 = S_MOV_B32 killed $sgpr7
    INLINEASM &"; no-op", 1, 327690, def $vgpr5
    $vgpr0 = V_INTERP_P1_F32 killed $vgpr4, 0, 0, implicit $m0, implicit $exec
    SI_RETURN_TO_EPILOG killed $vgpr5, killed $vgpr0
...