; 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.Node = type { i32, ptr }

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z12insertAtHeadRP4Nodei(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef) unnamed_addr #3 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) #4

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z12insertAtTailRP4Nodei(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z16insertAtPositionRP4NodeS1_ii(ptr noundef nonnull align 8 dereferenceable(8) %0, ptr noundef nonnull align 8 dereferenceable(8) %1, i32 noundef %2, i32 noundef %3) #0 personality ptr @__gxx_personality_v0 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  %12 = alloca ptr, align 8
  %13 = alloca ptr, align 8
  %14 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  %15 = load i32, ptr %7, align 4, !tbaa !9
  %16 = icmp eq i32 %15, 1
  br i1 %16, label %17, label %20

17:                                               ; preds = %4
  %18 = load ptr, ptr %6, align 8, !tbaa !5
  %19 = load i32, ptr %8, align 4, !tbaa !9
  call void @_Z12insertAtHeadRP4Nodei(ptr noundef nonnull align 8 dereferenceable(8) %18, i32 noundef %19)
  br label %56

20:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #5
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = load ptr, ptr %21, align 8, !tbaa !5
  store ptr %22, ptr %9, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #5
  store i32 1, ptr %10, align 4, !tbaa !9
  br label %23

23:                                               ; preds = %28, %20
  %24 = load i32, ptr %10, align 4, !tbaa !9
  %25 = load i32, ptr %7, align 4, !tbaa !9
  %26 = sub nsw i32 %25, 1
  %27 = icmp slt i32 %24, %26
  br i1 %27, label %28, label %34

28:                                               ; preds = %23
  %29 = load ptr, ptr %9, align 8, !tbaa !5
  %30 = getelementptr inbounds %class.Node, ptr %29, i32 0, i32 1
  %31 = load ptr, ptr %30, align 8, !tbaa !11
  store ptr %31, ptr %9, align 8, !tbaa !5
  %32 = load i32, ptr %10, align 4, !tbaa !9
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %10, align 4, !tbaa !9
  br label %23, !llvm.loop !13

34:                                               ; preds = %23
  %35 = load ptr, ptr %9, align 8, !tbaa !5
  %36 = getelementptr inbounds %class.Node, ptr %35, i32 0, i32 1
  %37 = load ptr, ptr %36, align 8, !tbaa !11
  %38 = icmp eq ptr %37, null
  br i1 %38, label %39, label %42

39:                                               ; preds = %34
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  %41 = load i32, ptr %8, align 4, !tbaa !9
  call void @_Z12insertAtTailRP4Nodei(ptr noundef nonnull align 8 dereferenceable(8) %40, i32 noundef %41)
  store i32 1, ptr %11, align 4
  br label %54

42:                                               ; preds = %34
  call void @llvm.lifetime.start.p0(i64 8, ptr %12) #5
  %43 = call noalias noundef nonnull ptr @_Znwm(i64 noundef 16) #6
  %44 = load i32, ptr %8, align 4, !tbaa !9
  invoke void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16) %43, i32 noundef %44)
          to label %45 unwind label %57

45:                                               ; preds = %42
  store ptr %43, ptr %12, align 8, !tbaa !5
  %46 = load ptr, ptr %9, align 8, !tbaa !5
  %47 = getelementptr inbounds %class.Node, ptr %46, i32 0, i32 1
  %48 = load ptr, ptr %47, align 8, !tbaa !11
  %49 = load ptr, ptr %12, align 8, !tbaa !5
  %50 = getelementptr inbounds %class.Node, ptr %49, i32 0, i32 1
  store ptr %48, ptr %50, align 8, !tbaa !11
  %51 = load ptr, ptr %12, align 8, !tbaa !5
  %52 = load ptr, ptr %9, align 8, !tbaa !5
  %53 = getelementptr inbounds %class.Node, ptr %52, i32 0, i32 1
  store ptr %51, ptr %53, align 8, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %12) #5
  store i32 0, ptr %11, align 4
  br label %54

54:                                               ; preds = %45, %39
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #5
  %55 = load i32, ptr %11, align 4
  switch i32 %55, label %66 [
    i32 0, label %56
    i32 1, label %56
  ]

56:                                               ; preds = %54, %54, %17
  ret void

57:                                               ; preds = %42
  %58 = landingpad { ptr, i32 }
          cleanup
  %59 = extractvalue { ptr, i32 } %58, 0
  store ptr %59, ptr %13, align 8
  %60 = extractvalue { ptr, i32 } %58, 1
  store i32 %60, ptr %14, align 4
  call void @_ZdlPvm(ptr noundef %43, i64 noundef 16) #7
  call void @llvm.lifetime.end.p0(i64 8, ptr %12) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #5
  br label %61

61:                                               ; preds = %57
  %62 = load ptr, ptr %13, align 8
  %63 = load i32, ptr %14, align 4
  %64 = insertvalue { ptr, i32 } poison, ptr %62, 0
  %65 = insertvalue { ptr, i32 } %64, i32 %63, 1
  resume { ptr, i32 } %65

66:                                               ; preds = %54
  unreachable
}

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nobuiltin allocsize(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 = { 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 #4 = { nobuiltin nounwind "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 }
attributes #6 = { builtin allocsize(0) }
attributes #7 = { builtin 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 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 8}
!12 = !{!"_ZTS4Node", !10, i64 0, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"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"

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z12insertAtHeadRP4Nodei(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #0

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef) unnamed_addr #2 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z12insertAtTailRP4Nodei(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z16insertAtPositionRP4NodeS1_ii(ptr noundef nonnull align 8 dereferenceable(8) %0, ptr noundef nonnull align 8 dereferenceable(8) %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 personality ptr @__gxx_personality_v0 {
  %5 = icmp eq i32 %2, 1
  br i1 %5, label %10, label %.preheader

.preheader:                                       ; preds = %4
  %.017 = load ptr, ptr %1, align 8, !tbaa !5
  %6 = icmp sgt i32 %2, 2
  br i1 %6, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %.preheader
  %7 = add nsw i32 %2, -2
  %8 = add nsw i32 %2, -3
  %xtraiter = and i32 %7, 7
  %9 = icmp ult i32 %8, 7
  br i1 %9, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i32 %7, -8
  br label %.lr.ph

10:                                               ; preds = %4
  tail call void @_Z12insertAtHeadRP4Nodei(ptr noundef nonnull align 8 dereferenceable(8) %1, i32 noundef %3)
  br label %28

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %.019 = phi ptr [ %.017, %.lr.ph.preheader.new ], [ %.0.7, %.lr.ph ]
  %niter = phi i32 [ 0, %.lr.ph.preheader.new ], [ %niter.next.7, %.lr.ph ]
  %11 = getelementptr inbounds i8, ptr %.019, i64 8
  %.0 = load ptr, ptr %11, align 8, !tbaa !5
  %12 = getelementptr inbounds i8, ptr %.0, i64 8
  %.0.1 = load ptr, ptr %12, align 8, !tbaa !5
  %13 = getelementptr inbounds i8, ptr %.0.1, i64 8
  %.0.2 = load ptr, ptr %13, align 8, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %.0.2, i64 8
  %.0.3 = load ptr, ptr %14, align 8, !tbaa !5
  %15 = getelementptr inbounds i8, ptr %.0.3, i64 8
  %.0.4 = load ptr, ptr %15, align 8, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %.0.4, i64 8
  %.0.5 = load ptr, ptr %16, align 8, !tbaa !5
  %17 = getelementptr inbounds i8, ptr %.0.5, i64 8
  %.0.6 = load ptr, ptr %17, align 8, !tbaa !5
  %18 = getelementptr inbounds i8, ptr %.0.6, i64 8
  %.0.7 = load ptr, ptr %18, align 8, !tbaa !5
  %niter.next.7 = add i32 %niter, 8
  %niter.ncmp.7 = icmp eq i32 %niter.next.7, %unroll_iter
  br i1 %niter.ncmp.7, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !9

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.0.lcssa23.ph = phi ptr [ poison, %.lr.ph.preheader ], [ %.0.7, %.lr.ph ]
  %.019.unr = phi ptr [ %.017, %.lr.ph.preheader ], [ %.0.7, %.lr.ph ]
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil
  %.019.epil = phi ptr [ %.0.epil, %.lr.ph.epil ], [ %.019.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i32 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %19 = getelementptr inbounds i8, ptr %.019.epil, i64 8
  %.0.epil = load ptr, ptr %19, align 8, !tbaa !5
  %epil.iter.next = add i32 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i32 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge, label %.lr.ph.epil, !llvm.loop !11

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil, %.preheader
  %.0.lcssa = phi ptr [ %.017, %.preheader ], [ %.0.lcssa23.ph, %._crit_edge.loopexit.unr-lcssa ], [ %.0.epil, %.lr.ph.epil ]
  %20 = getelementptr inbounds i8, ptr %.0.lcssa, i64 8
  %21 = load ptr, ptr %20, align 8, !tbaa !13
  %22 = icmp eq ptr %21, null
  br i1 %22, label %23, label %24

23:                                               ; preds = %._crit_edge
  tail call void @_Z12insertAtTailRP4Nodei(ptr noundef nonnull align 8 dereferenceable(8) %0, i32 noundef %3)
  br label %28

24:                                               ; preds = %._crit_edge
  %25 = tail call noalias noundef nonnull dereferenceable(16) ptr @_Znwm(i64 noundef 16) #3
  tail call void @_ZN4NodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16) %25, i32 noundef %3)
  %26 = load ptr, ptr %20, align 8, !tbaa !13
  %27 = getelementptr inbounds i8, ptr %25, i64 8
  store ptr %26, ptr %27, align 8, !tbaa !13
  store ptr %25, ptr %20, align 8, !tbaa !13
  br label %28

28:                                               ; preds = %23, %24, %10
  ret void
}

attributes #0 = { 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 #1 = { nobuiltin allocsize(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 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 #3 = { builtin allocsize(0) }

!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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.unroll.disable"}
!13 = !{!14, !6, i64 8}
!14 = !{!"_ZTS4Node", !15, i64 0, !6, i64 8}
!15 = !{!"int", !7, i64 0}


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