llvm/llvm/test/CodeGen/AMDGPU/postra-machine-sink.mir

# RUN: llc -mtriple=amdgcn -mcpu=gfx908 -run-pass=postra-machine-sink -verify-machineinstrs -o - %s | FileCheck %s

# Don't sink copy that writes sub-register of another copy source register
# CHECK-LABEL: name: donotsinkcopy
# CHECK-LABEL: bb.0:
# CHECK: renamable $sgpr1 = COPY renamable $sgpr2
# CHECK-LABEL: bb.1:
# CHECK: liveins: $sgpr0_sgpr1
# CHECK: renamable $vgpr1_vgpr2 = COPY renamable $sgpr0_sgpr1

---
name: donotsinkcopy
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $sgpr0, $sgpr2, $vgpr3
    S_CMP_LT_U32 renamable $sgpr2, target-flags(amdgpu-gotprel32-lo) 2, implicit-def $scc
    renamable $sgpr1 = COPY renamable $sgpr2
    renamable $vgpr1_vgpr2 = COPY renamable $sgpr0_sgpr1
    S_CBRANCH_SCC0 %bb.2, implicit $scc

  bb.1:
    liveins: $vgpr2, $sgpr0_sgpr1:0x00000003
    S_BRANCH %bb.4

  bb.2:
    liveins: $sgpr1

  bb.4:
   S_ENDPGM 0
...