# RUN: llc -run-pass=livedebugvalues %s -o - -experimental-debug-variable-locations | FileCheck %s --check-prefixes=CHECK

# Test that we do not drop debug values when joining a VPHI and a Def that use
# the same value.
# In this test case, the live out value for "a" from bb.4 is a VPHI with a
# defined value, the value live-in register $esi at bb.3. In bb.5, we also have
# a DBG_INSTR_REF that explicitly defines "a" as holding that same value. When
# joining these values to determine the live-in value of "a" at bb.6, we should
# recognize that these values are identical and produce a valid live-in debug
# value.

# CHECK: ![[VAR:[0-9]+]] = !DILocalVariable(name: "a"

# CHECK-LABEL: bb.6
# CHECK: DBG_VALUE_LIST ![[VAR]], !DIExpression(DW_OP_LLVM_arg, 0), $esi

--- |
  target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
  target triple = "x86_64-unknown-linux-gnu"

  ; Function Attrs: mustprogress uwtable
  define dso_local noundef i32 @"?foo@@YAHH@Z"(i32 noundef %0) local_unnamed_addr #0 !dbg !8 {
    call void @llvm.dbg.value(metadata i32 %0, metadata !14, metadata !DIExpression()), !dbg !16
    %2 = tail call noundef i32 @"?bar@@YAHXZ"(), !dbg !17
    br label %3, !dbg !18

  3:                                                ; preds = %13, %1
    %4 = phi i32 [ %0, %1 ], [ %14, %13 ]
    %5 = phi i32 [ %2, %1 ], [ %7, %13 ], !dbg !16
    call void @llvm.dbg.value(metadata i32 %4, metadata !14, metadata !DIExpression()), !dbg !16
    %6 = tail call noundef i32 @"?bar@@YAHXZ"(), !dbg !19
    %7 = sub nsw i32 %5, %6, !dbg !19
    %8 = srem i32 %7, 3, !dbg !21
    %9 = icmp eq i32 %8, 0, !dbg !21
    br i1 %9, label %10, label %13, !dbg !21

  10:                                               ; preds = %3
    %11 = tail call noundef i32 @"?bar@@YAHXZ"(), !dbg !22
    %12 = add nsw i32 %11, %4, !dbg !22
    call void @llvm.dbg.value(metadata i32 %12, metadata !14, metadata !DIExpression()), !dbg !16
    br label %13, !dbg !25

  13:                                               ; preds = %10, %3
    %14 = phi i32 [ %12, %10 ], [ %4, %3 ]
    call void @llvm.dbg.value(metadata i32 %14, metadata !14, metadata !DIExpression()), !dbg !16
    %15 = icmp sgt i32 %7, 0, !dbg !26
    br i1 %15, label %3, label %16, !dbg !26, !llvm.loop !27

  16:                                               ; preds = %13
    %17 = and i32 %7, 1, !dbg !30
    %18 = icmp eq i32 %17, 0, !dbg !30
    br i1 %18, label %19, label %22, !dbg !30

  19:                                               ; preds = %16
    %20 = tail call noundef i32 @"?bar@@YAHXZ"(), !dbg !31
    %21 = add nsw i32 %20, %14, !dbg !31
    call void @llvm.dbg.value(metadata i32 %21, metadata !14, metadata !DIExpression()), !dbg !16
    br label %22, !dbg !34

  22:                                               ; preds = %19, %16
    %23 = phi i32 [ %21, %19 ], [ %14, %16 ], !dbg !16
    call void @llvm.dbg.value(metadata i32 %23, metadata !14, metadata !DIExpression()), !dbg !16
    ret i32 %23, !dbg !35
  }

  declare dso_local noundef i32 @"?bar@@YAHXZ"() local_unnamed_addr #1

  ; Function Attrs: nocallback nofree nosync nounwind readnone speculatable willreturn
  declare void @llvm.dbg.value(metadata, metadata, metadata) #2

  attributes #0 = { mustprogress uwtable "frame-pointer"="none" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
  attributes #1 = { "frame-pointer"="none" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
  attributes #2 = { nocallback nofree nosync nounwind readnone speculatable willreturn }

  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!3, !4, !5, !6}
  !llvm.ident = !{!7}

  !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 15.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
  !1 = !DIFile(filename: "test.cpp", directory: "\")
  !3 = !{i32 2, !"Debug Info Version", i32 3}
  !4 = !{i32 1, !"wchar_size", i32 2}
  !5 = !{i32 7, !"PIC Level", i32 2}
  !6 = !{i32 7, !"uwtable", i32 2}
  !7 = !{!"clang version 15.0.0"}
  !8 = distinct !DISubprogram(name: "foo", linkageName: "?foo@@YAHH@Z", scope: !9, file: !9, line: 3, type: !10, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !13)
  !9 = !DIFile(filename: ".\\test.cpp", directory: "\")
  !10 = !DISubroutineType(types: !11)
  !11 = !{!12, !12}
  !12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !13 = !{!14}
  !14 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !9, line: 3, type: !12)
  !16 = !DILocation(line: 0, scope: !8)
  !17 = !DILocation(line: 4, scope: !8)
  !18 = !DILocation(line: 5, scope: !8)
  !19 = !DILocation(line: 6, scope: !20)
  !20 = distinct !DILexicalBlock(scope: !8, file: !9, line: 5)
  !21 = !DILocation(line: 7, scope: !20)
  !22 = !DILocation(line: 8, scope: !23)
  !23 = distinct !DILexicalBlock(scope: !24, file: !9, line: 7)
  !24 = distinct !DILexicalBlock(scope: !20, file: !9, line: 7)
  !25 = !DILocation(line: 9, scope: !23)
  !26 = !DILocation(line: 10, scope: !20)
  !27 = distinct !{!27, !18, !28, !29}
  !28 = !DILocation(line: 10, scope: !8)
  !29 = !{!"llvm.loop.mustprogress"}
  !30 = !DILocation(line: 11, scope: !8)
  !31 = !DILocation(line: 12, scope: !32)
  !32 = distinct !DILexicalBlock(scope: !33, file: !9, line: 11)
  !33 = distinct !DILexicalBlock(scope: !8, file: !9, line: 11)
  !34 = !DILocation(line: 13, scope: !32)
  !35 = !DILocation(line: 14, scope: !8)

...
---
name:            '?foo@@YAHH@Z'
alignment:       16
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
failedISel:      false
tracksRegLiveness: true
hasWinCFI:       true
callsEHReturn:   false
callsUnwindInit: false
hasEHCatchret:   false
hasEHScopes:     false
hasEHFunclets:   false
failsVerification: false
tracksDebugUserValues: true
debugInstrRef: true
registers:       []
liveins:
  - { reg: '$ecx', virtual-reg: '' }
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       56
  offsetAdjustment: -56
  maxAlignment:    8
  adjustsStack:    true
  hasCalls:        true
  stackProtector:  ''
  functionContext: ''
  maxCallFrameSize: 32
  cvBytesOfCalleeSavedRegisters: 16
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  hasTailCall:     false
  localFrameSize:  0
  savePoint:       ''
  restorePoint:    ''
fixedStack:
  - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default,
      callee-saved-register: '$rdi', callee-saved-restored: true, debug-info-variable: '',
      debug-info-expression: '', debug-info-location: '' }
  - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
      callee-saved-register: '$rsi', callee-saved-restored: true, debug-info-variable: '',
      debug-info-expression: '', debug-info-location: '' }
stack:           []
callSites:       []
debugValueSubstitutions: []
constants:       []
machineFunctionInfo: {}
body:             |
  bb.0 (%ir-block.1):
    successors: %bb.1(0x80000000)
    liveins: $ecx, $rsi, $rdi

    DBG_VALUE $ecx, $noreg, !14, !DIExpression(), debug-location !16
    frame-setup PUSH64r killed $rsi, implicit-def $rsp, implicit $rsp
    frame-setup SEH_PushReg 57
    frame-setup PUSH64r killed $rdi, implicit-def $rsp, implicit $rsp
    frame-setup SEH_PushReg 53
    $rsp = frame-setup SUB64ri8 $rsp, 40, implicit-def dead $eflags
    frame-setup SEH_StackAlloc 40
    frame-setup SEH_EndPrologue
    $esi = MOV32rr $ecx
    CALL64pcrel32 @"?bar@@YAHXZ", csr_win64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-instr-number 8, debug-location !17
    $edi = MOV32rr $eax, debug-location !17
    JMP_1 %bb.1

  bb.3 (%ir-block.13, align 16):
    successors: %bb.1(0x7c000000), %bb.4(0x04000000)
    liveins: $edi, $esi

    DBG_PHI $esi, 5
    TEST32rr renamable $edi, renamable $edi, implicit-def $eflags, debug-location !26
    JCC_1 %bb.4, 14, implicit $eflags, debug-location !26

  bb.1 (%ir-block.3):
    successors: %bb.2(0x30000000), %bb.3(0x50000000)
    liveins: $edi, $esi

    DBG_PHI $esi, 3
    DBG_PHI $edi, 2
    DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(3, 0), debug-location !16
    CALL64pcrel32 @"?bar@@YAHXZ", csr_win64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !19
    renamable $edi = nsw SUB32rr killed renamable $edi, killed renamable $eax, implicit-def dead $eflags, debug-instr-number 1, debug-location !19
    renamable $eax = IMUL32rri renamable $edi, -1431655765, implicit-def dead $eflags, debug-location !21
    renamable $eax = ADD32ri killed renamable $eax, 715827882, implicit-def dead $eflags, debug-location !21
    CMP32ri killed renamable $eax, 1431655764, implicit-def $eflags, debug-location !21
    JCC_1 %bb.3, 7, implicit $eflags, debug-location !21

  bb.2 (%ir-block.10):
    successors: %bb.3(0x80000000)
    liveins: $edi, $esi

    CALL64pcrel32 @"?bar@@YAHXZ", csr_win64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !22
    renamable $esi = nsw ADD32rr killed renamable $esi, killed renamable $eax, implicit-def dead $eflags, debug-instr-number 4, debug-location !22
    DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(4, 0), debug-location !16
    JMP_1 %bb.3

  bb.4 (%ir-block.16):
    successors: %bb.5(0x40000000), %bb.6(0x40000000)
    liveins: $edi, $esi

    TEST8ri renamable $dil, 1, implicit-def $eflags, implicit killed $edi, debug-location !30
    JCC_1 %bb.6, 5, implicit $eflags, debug-location !30

  bb.5 (%ir-block.19):
    successors: %bb.6(0x80000000)
    liveins: $esi

    CALL64pcrel32 @"?bar@@YAHXZ", csr_win64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !31
    DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(5, 0), debug-location !16

  bb.6 (%ir-block.22):
    liveins: $esi

    $eax = MOV32rr killed $esi, debug-location !35
    SEH_Epilogue debug-location !35
    $rsp = frame-destroy ADD64ri8 $rsp, 40, implicit-def dead $eflags, debug-location !35
    $rdi = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !35
    $rsi = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !35
    RET64 $eax, debug-location !35

...