src/llvm-project/llvm/test/CodeGen/AArch64/sink-and-fold-preserve-debugloc.mir

# RUN: llc %s -run-pass=machine-sink --aarch64-enable-sink-fold=true -o - | FileCheck %s
--- |
  target triple = "aarch64-linux"

  @.str = private unnamed_addr constant [12 x i8] c"result: %d\0A\00", align 1, !dbg !0

  define i32 @foo(i32 %x, i32 %y) !dbg !18 {
  entry:
    %add = add i32 %x, 3, !dbg !25
    %add1 = add i32 %add, %y, !dbg !26
    ret i32 %add1, !dbg !27
  }

  define i32 @baz(i32 %y) !dbg !28 {
  entry:
    %add1.i = add i32 %y, 23, !dbg !34
    tail call void @bar(ptr nonnull @.str, i32 %add1.i), !dbg !36
    ret i32 0, !dbg !37
  }

  declare !dbg !38 void @bar(ptr noundef, i32 noundef)

  !llvm.dbg.cu = !{!7}
  !llvm.module.flags = !{!9, !10, !11, !12, !13, !14, !15, !16}
  !llvm.ident = !{!17}

  !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
  !1 = distinct !DIGlobalVariable(scope: null, file: !2, line: 9, type: !3, isLocal: true, isDefinition: true)
  !2 = !DIFile(filename: "m.c", directory: "/home/chill")
  !3 = !DICompositeType(tag: DW_TAG_array_type, baseType: !4, size: 96, elements: !5)
  !4 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_unsigned_char)
  !5 = !{!6}
  !6 = !DISubrange(count: 12)
  !7 = distinct !DICompileUnit(language: DW_LANG_C11, file: !2, producer: "clang version 18.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, globals: !8, splitDebugInlining: false, nameTableKind: None)
  !8 = !{!0}
  !9 = !{i32 7, !"Dwarf Version", i32 5}
  !10 = !{i32 2, !"Debug Info Version", i32 3}
  !11 = !{i32 1, !"wchar_size", i32 4}
  !12 = !{i32 8, !"PIC Level", i32 2}
  !13 = !{i32 7, !"PIE Level", i32 2}
  !14 = !{i32 7, !"uwtable", i32 2}
  !15 = !{i32 7, !"frame-pointer", i32 1}
  !16 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
  !17 = !{!"clang version 18.0.0"}
  !18 = distinct !DISubprogram(name: "foo", scope: !2, file: !2, line: 1, type: !19, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !7, retainedNodes: !22)
  !19 = !DISubroutineType(types: !20)
  !20 = !{!21, !21, !21}
  !21 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !22 = !{!23, !24}
  !23 = !DILocalVariable(name: "x", arg: 1, scope: !18, file: !2, line: 1, type: !21)
  !24 = !DILocalVariable(name: "y", arg: 2, scope: !18, file: !2, line: 1, type: !21)
  !25 = !DILocation(line: 2, column: 12, scope: !18)
  !26 = !DILocation(line: 2, column: 16, scope: !18)
  !27 = !DILocation(line: 2, column: 3, scope: !18)
  !28 = distinct !DISubprogram(name: "baz", scope: !2, file: !2, line: 7, type: !29, scopeLine: 7, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !7, retainedNodes: !31)
  !29 = !DISubroutineType(types: !30)
  !30 = !{!21, !21}
  !31 = !{!32, !33}
  !32 = !DILocalVariable(name: "y", arg: 1, scope: !28, file: !2, line: 7, type: !21)
  !33 = !DILocalVariable(name: "result", scope: !28, file: !2, line: 8, type: !21)
  !34 = !DILocation(line: 2, column: 16, scope: !18, inlinedAt: !35)
  !35 = distinct !DILocation(line: 8, column: 16, scope: !28)
  !36 = !DILocation(line: 9, column: 3, scope: !28)
  !37 = !DILocation(line: 10, column: 3, scope: !28)
  !38 = !DISubprogram(name: "bar", scope: !2, file: !2, line: 5, type: !39, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
  !39 = !DISubroutineType(types: !40)
  !40 = !{null, !41, !21}
  !41 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !42, size: 64)
  !42 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !4)

...
---
name:            foo
alignment:       4
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
failedISel:      false
tracksRegLiveness: true
hasWinCFI:       false
callsEHReturn:   false
callsUnwindInit: false
hasEHCatchret:   false
hasEHScopes:     false
hasEHFunclets:   false
isOutlined:      false
debugInstrRef:   false
failsVerification: false
tracksDebugUserValues: false
registers:
  - { id: 0, class: gpr32, preferred-register: '' }
  - { id: 1, class: gpr32, preferred-register: '' }
  - { id: 2, class: gpr32common, preferred-register: '' }
  - { id: 3, class: gpr32sp, preferred-register: '' }
liveins:
  - { reg: '$w0', virtual-reg: '%0' }
  - { reg: '$w1', virtual-reg: '%1' }
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    1
  adjustsStack:    false
  hasCalls:        false
  stackProtector:  ''
  functionContext: ''
  maxCallFrameSize: 0
  cvBytesOfCalleeSavedRegisters: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  hasTailCall:     false
  localFrameSize:  0
  savePoint:       ''
  restorePoint:    ''
fixedStack:      []
stack:           []
entry_values:    []
callSites:       []
debugValueSubstitutions: []
constants:       []
machineFunctionInfo: {}
body:             |
  bb.0.entry:
    liveins: $w0, $w1

    ; CHECK-LABEL: name: foo

    ; Check the source location of the ADDWri was reused (usually the
    ; copy to $w0 carries the same debug location as the return)

    ; CHECK: $w0 = ADDWri {{.*}}, 3, 0, debug-location !26
    ; CHECK-NEXT: RET_ReallyLR implicit $w0, debug-location !27
    %1:gpr32 = COPY $w1
    %0:gpr32 = COPY $w0
    %2:gpr32common = ADDWrr %0, %1, debug-location !25
    $w0 = ADDWri %2, 3, 0, debug-location !26
    RET_ReallyLR implicit $w0, debug-location !27

...
---
name:            baz
alignment:       4
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
failedISel:      false
tracksRegLiveness: true
hasWinCFI:       false
callsEHReturn:   false
callsUnwindInit: false
hasEHCatchret:   false
hasEHScopes:     false
hasEHFunclets:   false
isOutlined:      false
debugInstrRef:   false
failsVerification: false
tracksDebugUserValues: false
registers:
  - { id: 0, class: gpr32common, preferred-register: '' }
  - { id: 1, class: gpr32sp, preferred-register: '' }
  - { id: 2, class: gpr64common, preferred-register: '' }
  - { id: 3, class: gpr32all, preferred-register: '' }
liveins:
  - { reg: '$w0', virtual-reg: '%0' }
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    1
  adjustsStack:    true
  hasCalls:        true
  stackProtector:  ''
  functionContext: ''
  maxCallFrameSize: 0
  cvBytesOfCalleeSavedRegisters: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  hasTailCall:     false
  localFrameSize:  0
  savePoint:       ''
  restorePoint:    ''
fixedStack:      []
stack:           []
entry_values:    []
callSites:       []
debugValueSubstitutions: []
constants:       []
machineFunctionInfo: {}
body:             |
  bb.0.entry:
    liveins: $w0

    ; CHECK-LABEL: name: baz

    ; Check the source location of the ADDWri was reused (usually the
    ; copy to $w1 carries the same debug location as the BL)

    ; CHECK:     $x0 = COPY  {{.*}}, debug-location !36
    ; CHECK-NEXT: $w1 = ADDWri {{.*}}, 23, 0, debug-location !34
    ; CHECK-NEXT: BL @bar, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $x0, implicit $w1, implicit-def $sp, debug-location !36

    %0:gpr32common = COPY $w0
    ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp, debug-location !36
    %2:gpr64common = MOVaddr target-flags(aarch64-page) @.str, target-flags(aarch64-pageoff, aarch64-nc) @.str, debug-location !36
    $x0 = COPY %2, debug-location !36
    $w1 = ADDWri %0, 23, 0, debug-location !34
    BL @bar, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $x0, implicit $w1, implicit-def $sp, debug-location !36
    ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp, debug-location !36
    %3:gpr32all = COPY $wzr
    $w0 = COPY %3, debug-location !37
    RET_ReallyLR implicit $w0, debug-location !37

...