llvm-project/llvm/test/CodeGen/AMDGPU/coalescer-subreg-join.mir

# RUN: llc -march=amdgcn -run-pass simple-register-coalescing -o - %s | FileCheck %s
# Check that %11 and %20 have been coalesced.
# CHECK: IMAGE_SAMPLE_C_D_O_V1_V16 %[[REG:[0-9]+]]
# CHECK: IMAGE_SAMPLE_C_D_O_V1_V16 %[[REG]]

---
name:            main
alignment:       0
tracksRegLiveness: true
registers:
  - { id: 0, class: sreg_64 }
  - { id: 1, class: vgpr_32 }
  - { id: 2, class: vgpr_32 }
  - { id: 3, class: sreg_256 }
  - { id: 4, class: sreg_128 }
  - { id: 5, class: sreg_256 }
  - { id: 6, class: sreg_128 }
  - { id: 7, class: sreg_512 }
  - { id: 9, class: vreg_512 }
  - { id: 11, class: vreg_512 }
  - { id: 18, class: vgpr_32 }
  - { id: 20, class: vreg_512 }
  - { id: 27, class: vgpr_32 }
liveins:
  - { reg: '%sgpr2_sgpr3', virtual-reg: '%0' }
  - { reg: '%vgpr2', virtual-reg: '%1' }
  - { reg: '%vgpr3', virtual-reg: '%2' }
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: %sgpr2_sgpr3, %vgpr2, %vgpr3

    %0 = COPY %sgpr2_sgpr3
    %1 = COPY %vgpr2
    %2 = COPY %vgpr3
    %3 = S_LOAD_DWORDX8_IMM %0, 0, 0
    %4 = S_LOAD_DWORDX4_IMM %0, 12, 0
    %5 = S_LOAD_DWORDX8_IMM %0, 16, 0
    %6 = S_LOAD_DWORDX4_IMM %0, 28, 0
    undef %7.sub0 = S_MOV_B32 212739
    %20 = COPY %7
    %11 = COPY %20
    %11.sub1 = COPY %1
    %11.sub2 = COPY %1
    %11.sub3 = COPY %1
    %11.sub4 = COPY %1
    %11.sub5 = COPY %1
    %11.sub6 = COPY %1
    %11.sub7 = COPY %1
    %11.sub8 = COPY %1
    dead %18 = IMAGE_SAMPLE_C_D_O_V1_V16 %11, %3, %4, 1, 0, 0, 0, 0, 0, 0, -1, implicit %exec
    %20.sub1 = COPY %2
    %20.sub2 = COPY %2
    %20.sub3 = COPY %2
    %20.sub4 = COPY %2
    %20.sub5 = COPY %2
    %20.sub6 = COPY %2
    %20.sub7 = COPY %2
    %20.sub8 = COPY %2
    dead %27 = IMAGE_SAMPLE_C_D_O_V1_V16 %20, %5, %6, 1, 0, 0, 0, 0, 0, 0, -1, implicit %exec

...