llvm/llvm/test/CodeGen/AMDGPU/virtregrewrite-undef-identity-copy.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=amdgcn-amd-amdhsa -start-before=greedy,0 -stop-after=virtregrewriter,1 -verify-machineinstrs -o - %s | FileCheck %s

# The undef copy of %4 is allocated to $vgpr3, and the identity copy
# was deleted, and $vgpr3 was considered undef. The code to replace
# the undef copy with a kill was incorrectly checking the dest
# operand, rather than the source.

--- |
  define amdgpu_kernel void @undef_identity_copy() {
    ret void
  }

  declare hidden float @bar(<4 x float>)
  declare hidden void @foo()

...
---
name:            undef_identity_copy
tracksRegLiveness: true
frameInfo:
  maxAlignment:    4
  adjustsStack:    true
  hasCalls:        true
machineFunctionInfo:
  isEntryFunction: true
  scratchRSrcReg:  '$sgpr0_sgpr1_sgpr2_sgpr3'
  frameOffsetReg:  '$sgpr95'
  stackPtrOffsetReg: '$sgpr32'
body:             |
  bb.0:
    ; CHECK-LABEL: name: undef_identity_copy
    ; CHECK: [[FLAT_LOAD_DWORDX4_:%[0-9]+]]:vreg_128 = FLAT_LOAD_DWORDX4 undef %1:vreg_64, 0, 0, implicit $exec, implicit $flat_scr :: (load (s128), addrspace 1)
    ; CHECK-NEXT: renamable $sgpr6_sgpr7 = SI_PC_ADD_REL_OFFSET target-flags(amdgpu-rel32-lo) @foo + 4, target-flags(amdgpu-rel32-hi) @foo + 4, implicit-def dead $scc
    ; CHECK-NEXT: ADJCALLSTACKUP 0, 0, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95, implicit-def $scc
    ; CHECK-NEXT: $sgpr4 = COPY $sgpr95
    ; CHECK-NEXT: dead $sgpr30_sgpr31 = SI_CALL killed renamable $sgpr6_sgpr7, @foo, csr_amdgpu, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr4
    ; CHECK-NEXT: ADJCALLSTACKDOWN 0, 4, implicit-def $scc, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
    ; CHECK-NEXT: renamable $sgpr6_sgpr7 = SI_PC_ADD_REL_OFFSET target-flags(amdgpu-rel32-lo) @bar + 4, target-flags(amdgpu-rel32-hi) @bar + 4, implicit-def dead $scc
    ; CHECK-NEXT: ADJCALLSTACKUP 0, 0, implicit-def $scc, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
    ; CHECK-NEXT: $sgpr4 = COPY $sgpr95
    ; CHECK-NEXT: $vgpr0 = COPY [[FLAT_LOAD_DWORDX4_]].sub0
    ; CHECK-NEXT: $vgpr1 = COPY [[FLAT_LOAD_DWORDX4_]].sub1
    ; CHECK-NEXT: $vgpr2 = COPY [[FLAT_LOAD_DWORDX4_]].sub2
    ; CHECK-NEXT: $vgpr3 = COPY undef %4:vgpr_32
    ; CHECK-NEXT: dead $sgpr30_sgpr31 = SI_CALL killed renamable $sgpr6_sgpr7, @bar, csr_amdgpu, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr4, implicit $vgpr0, implicit killed $vgpr1, implicit killed $vgpr2, implicit killed $vgpr3, implicit-def $vgpr0
    ; CHECK-NEXT: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr0
    ; CHECK-NEXT: ADJCALLSTACKDOWN 0, 4, implicit-def $scc, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
    ; CHECK-NEXT: FLAT_STORE_DWORD undef %6:vreg_64, [[COPY]], 0, 0, implicit $exec, implicit $flat_scr :: (store (s32), addrspace 1)
    ; CHECK-NEXT: S_ENDPGM 0
    %0:vreg_128 = FLAT_LOAD_DWORDX4 undef %1:vreg_64, 0, 0, implicit $exec, implicit $flat_scr :: (load (s128), addrspace 1)
    %2:sreg_64 = SI_PC_ADD_REL_OFFSET target-flags(amdgpu-rel32-lo) @foo + 4, target-flags(amdgpu-rel32-hi) @foo + 4, implicit-def dead $scc
    ADJCALLSTACKUP 0, 0, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95, implicit-def $scc
    $sgpr4 = COPY $sgpr95
    dead $sgpr30_sgpr31 = SI_CALL %2, @foo, csr_amdgpu, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr4
    ADJCALLSTACKDOWN 0, 4, implicit-def $scc, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
    %3:sreg_64 = SI_PC_ADD_REL_OFFSET target-flags(amdgpu-rel32-lo) @bar + 4, target-flags(amdgpu-rel32-hi) @bar + 4, implicit-def dead $scc
    ADJCALLSTACKUP 0, 0, implicit-def $scc, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
    $sgpr4 = COPY $sgpr95
    $vgpr0 = COPY %0.sub0
    $vgpr1 = COPY %0.sub1
    $vgpr2 = COPY %0.sub2
    $vgpr3 = COPY undef %4:vgpr_32
    dead $sgpr30_sgpr31 = SI_CALL %3, @bar, csr_amdgpu, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr4, implicit $vgpr0, implicit killed $vgpr1, implicit killed $vgpr2, implicit killed $vgpr3, implicit-def $vgpr0
    %5:vgpr_32 = COPY $vgpr0
    ADJCALLSTACKDOWN 0, 4, implicit-def $scc, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
    FLAT_STORE_DWORD undef %6:vreg_64, %5, 0, 0, implicit $exec, implicit $flat_scr :: (store (s32), addrspace 1)
    S_ENDPGM 0

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