; LLVM IR from Py-Contributors/AlgorithmsAndDataStructure :: C++/Algorithms/Flody's Cycle Detection Algorithm (floydCycleDetectionAlgorithm)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::map" = type { %"class.std::_Rb_tree" }
%"class.std::_Rb_tree" = type { %"struct.std::_Rb_tree<Node *, std::pair<Node *const, bool>, std::_Select1st<std::pair<Node *const, bool>>, std::less<Node *>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<Node *, std::pair<Node *const, bool>, std::_Select1st<std::pair<Node *const, bool>>, std::less<Node *>>::_Rb_tree_impl" = type { [8 x i8], %"struct.std::_Rb_tree_header" }
%"struct.std::_Rb_tree_header" = type { %"struct.std::_Rb_tree_node_base", i64 }
%"struct.std::_Rb_tree_node_base" = type { i32, ptr, ptr, ptr }
%class.Node = type { i32, ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str.2 = external hidden unnamed_addr constant [20 x i8], align 1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

declare i32 @__gxx_personality_v0(...)

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #1

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #2 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #1

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #3

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z10detectLoopP4Node(ptr noundef %0) #2 personality ptr @__gxx_personality_v0 {
  %2 = alloca i1, align 1
  %3 = alloca ptr, align 8
  %4 = alloca %"class.std::map", align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = icmp eq ptr %9, null
  br i1 %10, label %11, label %12

11:                                               ; preds = %1
  store i1 false, ptr %2, align 1
  br label %46

12:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 48, ptr %4) #5
  call void @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEEC2Ev(ptr noundef nonnull align 8 dereferenceable(48) %4) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #5
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %13, ptr %5, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %40, %12
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = icmp ne ptr %15, null
  br i1 %16, label %17, label %44

17:                                               ; preds = %14
  %18 = invoke noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEEixERS5_(ptr noundef nonnull align 8 dereferenceable(48) %4, ptr noundef nonnull align 8 dereferenceable(8) %5)
          to label %19 unwind label %34

19:                                               ; preds = %17
  %20 = load i8, ptr %18, align 1, !tbaa !9, !range !11, !noundef !12
  %21 = trunc i8 %20 to i1
  %22 = zext i1 %21 to i32
  %23 = icmp eq i32 %22, 1
  br i1 %23, label %24, label %38

24:                                               ; preds = %19
  %25 = invoke noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef @.str.2)
          to label %26 unwind label %34

26:                                               ; preds = %24
  %27 = load ptr, ptr %5, align 8, !tbaa !5
  %28 = getelementptr inbounds %class.Node, ptr %27, i32 0, i32 0
  %29 = load i32, ptr %28, align 8, !tbaa !13
  %30 = invoke noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) %25, i32 noundef %29)
          to label %31 unwind label %34

31:                                               ; preds = %26
  %32 = invoke noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %30, ptr noundef @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
          to label %33 unwind label %34

33:                                               ; preds = %31
  store i1 true, ptr %2, align 1
  store i32 1, ptr %8, align 4
  br label %45

34:                                               ; preds = %38, %31, %26, %24, %17
  %35 = landingpad { ptr, i32 }
          cleanup
  %36 = extractvalue { ptr, i32 } %35, 0
  store ptr %36, ptr %6, align 8
  %37 = extractvalue { ptr, i32 } %35, 1
  store i32 %37, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  call void @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEED2Ev(ptr noundef nonnull align 8 dereferenceable(48) %4) #5
  call void @llvm.lifetime.end.p0(i64 48, ptr %4) #5
  br label %48

38:                                               ; preds = %19
  %39 = invoke noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEEixERS5_(ptr noundef nonnull align 8 dereferenceable(48) %4, ptr noundef nonnull align 8 dereferenceable(8) %5)
          to label %40 unwind label %34

40:                                               ; preds = %38
  store i8 1, ptr %39, align 1, !tbaa !9
  %41 = load ptr, ptr %5, align 8, !tbaa !5
  %42 = getelementptr inbounds %class.Node, ptr %41, i32 0, i32 1
  %43 = load ptr, ptr %42, align 8, !tbaa !16
  store ptr %43, ptr %5, align 8, !tbaa !5
  br label %14, !llvm.loop !17

44:                                               ; preds = %14
  store i1 false, ptr %2, align 1
  store i32 1, ptr %8, align 4
  br label %45

45:                                               ; preds = %44, %33
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  call void @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEED2Ev(ptr noundef nonnull align 8 dereferenceable(48) %4) #5
  call void @llvm.lifetime.end.p0(i64 48, ptr %4) #5
  br label %46

46:                                               ; preds = %45, %11
  %47 = load i1, ptr %2, align 1
  ret i1 %47

48:                                               ; preds = %34
  %49 = load ptr, ptr %6, align 8
  %50 = load i32, ptr %7, align 4
  %51 = insertvalue { ptr, i32 } poison, ptr %49, 0
  %52 = insertvalue { ptr, i32 } %51, i32 %50, 1
  resume { ptr, i32 } %52
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEEC2Ev(ptr noundef nonnull align 8 dereferenceable(48)) unnamed_addr #4 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEEixERS5_(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEED2Ev(ptr noundef nonnull align 8 dereferenceable(48)) unnamed_addr #4 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #4 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #5 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = !{!14, !15, i64 0}
!14 = !{!"_ZTS4Node", !15, i64 0, !6, i64 8}
!15 = !{!"int", !7, i64 0}
!16 = !{!14, !6, i64 8}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::map" = type { %"class.std::_Rb_tree" }
%"class.std::_Rb_tree" = type { %"struct.std::_Rb_tree<Node *, std::pair<Node *const, bool>, std::_Select1st<std::pair<Node *const, bool>>, std::less<Node *>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<Node *, std::pair<Node *const, bool>, std::_Select1st<std::pair<Node *const, bool>>, std::less<Node *>>::_Rb_tree_impl" = type { [8 x i8], %"struct.std::_Rb_tree_header" }
%"struct.std::_Rb_tree_header" = type { %"struct.std::_Rb_tree_node_base", i64 }
%"struct.std::_Rb_tree_node_base" = type { i32, ptr, ptr, ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str.2 = external hidden unnamed_addr constant [20 x i8], align 1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #2 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #1

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #3

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z10detectLoopP4Node(ptr noundef %0) local_unnamed_addr #2 personality ptr @__gxx_personality_v0 {
  %2 = alloca %"class.std::map", align 8
  %3 = alloca ptr, align 8
  %4 = icmp eq ptr %0, null
  br i1 %4, label %26, label %5

5:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 48, ptr nonnull %2) #5
  call void @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEEC2Ev(ptr noundef nonnull align 8 dereferenceable(48) %2) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #5
  store ptr %0, ptr %3, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %5, %22
  %7 = invoke noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEEixERS5_(ptr noundef nonnull align 8 dereferenceable(48) %2, ptr noundef nonnull align 8 dereferenceable(8) %3)
          to label %8 unwind label %.loopexit5

8:                                                ; preds = %6
  %9 = load i8, ptr %7, align 1, !tbaa !9, !range !11, !noundef !12
  %10 = trunc nuw i8 %9 to i1
  br i1 %10, label %11, label %20

11:                                               ; preds = %8
  %12 = invoke noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef nonnull @.str.2)
          to label %13 unwind label %.loopexit.split-lp

13:                                               ; preds = %11
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = load i32, ptr %14, align 8, !tbaa !13
  %16 = invoke noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) %12, i32 noundef %15)
          to label %17 unwind label %.loopexit.split-lp

17:                                               ; preds = %13
  %18 = invoke noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %16, ptr noundef nonnull @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
          to label %.loopexit unwind label %.loopexit.split-lp

.loopexit5:                                       ; preds = %6, %20
  %lpad.loopexit = landingpad { ptr, i32 }
          cleanup
  br label %19

.loopexit.split-lp:                               ; preds = %11, %13, %17
  %lpad.loopexit.split-lp = landingpad { ptr, i32 }
          cleanup
  br label %19

19:                                               ; preds = %.loopexit.split-lp, %.loopexit5
  %lpad.phi = phi { ptr, i32 } [ %lpad.loopexit, %.loopexit5 ], [ %lpad.loopexit.split-lp, %.loopexit.split-lp ]
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #5
  call void @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEED2Ev(ptr noundef nonnull align 8 dereferenceable(48) %2) #5
  call void @llvm.lifetime.end.p0(i64 48, ptr nonnull %2) #5
  resume { ptr, i32 } %lpad.phi

20:                                               ; preds = %8
  %21 = invoke noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEEixERS5_(ptr noundef nonnull align 8 dereferenceable(48) %2, ptr noundef nonnull align 8 dereferenceable(8) %3)
          to label %22 unwind label %.loopexit5

22:                                               ; preds = %20
  store i8 1, ptr %21, align 1, !tbaa !9
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = getelementptr inbounds i8, ptr %23, i64 8
  %25 = load ptr, ptr %24, align 8, !tbaa !16
  store ptr %25, ptr %3, align 8, !tbaa !5
  %.not.not = icmp eq ptr %25, null
  br i1 %.not.not, label %.loopexit, label %6, !llvm.loop !17

.loopexit:                                        ; preds = %22, %17
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #5
  call void @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEED2Ev(ptr noundef nonnull align 8 dereferenceable(48) %2) #5
  call void @llvm.lifetime.end.p0(i64 48, ptr nonnull %2) #5
  br label %26

26:                                               ; preds = %1, %.loopexit
  %.1 = phi i1 [ %10, %.loopexit ], [ false, %1 ]
  ret i1 %.1
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEEC2Ev(ptr noundef nonnull align 8 dereferenceable(48)) unnamed_addr #4 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEEixERS5_(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt3mapIP4NodebSt4lessIS1_ESaISt4pairIKS1_bEEED2Ev(ptr noundef nonnull align 8 dereferenceable(48)) unnamed_addr #4 align 2

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #4 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #5 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = !{!14, !15, i64 0}
!14 = !{!"_ZTS4Node", !15, i64 0, !6, i64 8}
!15 = !{!"int", !7, i64 0}
!16 = !{!14, !6, i64 8}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass