; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/cp/total_pairs_chosen.ll (Z3DFSi)

; 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"

%"struct.std::_List_iterator" = type { ptr }
%"class.std::__cxx11::list" = type { %"class.std::__cxx11::_List_base" }
%"class.std::__cxx11::_List_base" = type { %"struct.std::__cxx11::_List_base<int, std::allocator<int>>::_List_impl" }
%"struct.std::__cxx11::_List_base<int, std::allocator<int>>::_List_impl" = type { %"struct.std::__detail::_List_node_header" }
%"struct.std::__detail::_List_node_header" = type { %"struct.std::__detail::_List_node_base", i64 }
%"struct.std::__detail::_List_node_base" = type { ptr, ptr }

@_Z2adB5cxx11 = external dso_local global ptr, align 8
@visited = external dso_local global ptr, align 8
@vertices = external dso_local global i32, align 4

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3DFSi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca %"struct.std::_List_iterator", align 8
  %4 = alloca %"struct.std::_List_iterator", align 8
  %5 = alloca %"struct.std::_List_iterator", align 8
  %6 = alloca %"struct.std::_List_iterator", align 8
  store i32 %0, ptr %2, align 4, !tbaa !5
  %7 = load ptr, ptr @visited, align 8, !tbaa !9
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds i32, ptr %7, i64 %9
  store i32 1, ptr %10, align 4, !tbaa !5
  %11 = load i32, ptr @vertices, align 4, !tbaa !5
  %12 = add nsw i32 %11, 1
  store i32 %12, ptr @vertices, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  call void @_ZNSt14_List_iteratorIiEC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %3) #4
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #4
  %13 = load ptr, ptr @_Z2adB5cxx11, align 8, !tbaa !9
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds %"class.std::__cxx11::list", ptr %13, i64 %15
  %17 = call ptr @_ZNSt7__cxx114listIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %16) #4
  %18 = getelementptr inbounds %"struct.std::_List_iterator", ptr %4, i32 0, i32 0
  store ptr %17, ptr %18, align 8
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %3, ptr align 8 %4, i64 8, i1 false), !tbaa.struct !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #4
  br label %19

19:                                               ; preds = %44, %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %20 = load ptr, ptr @_Z2adB5cxx11, align 8, !tbaa !9
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds %"class.std::__cxx11::list", ptr %20, i64 %22
  %24 = call ptr @_ZNSt7__cxx114listIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %23) #4
  %25 = getelementptr inbounds %"struct.std::_List_iterator", ptr %5, i32 0, i32 0
  store ptr %24, ptr %25, align 8
  %26 = call noundef zeroext i1 @_ZStneRKSt14_List_iteratorIiES2_(ptr noundef nonnull align 8 dereferenceable(8) %3, ptr noundef nonnull align 8 dereferenceable(8) %5) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  br i1 %26, label %27, label %47

27:                                               ; preds = %19
  %28 = load ptr, ptr @visited, align 8, !tbaa !9
  %29 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #4
  %30 = load i32, ptr %29, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds i32, ptr %28, i64 %31
  %33 = load i32, ptr %32, align 4, !tbaa !5
  %34 = icmp eq i32 %33, 0
  br i1 %34, label %35, label %43

35:                                               ; preds = %27
  %36 = load ptr, ptr @visited, align 8, !tbaa !9
  %37 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #4
  %38 = load i32, ptr %37, align 4, !tbaa !5
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds i32, ptr %36, i64 %39
  store i32 1, ptr %40, align 4, !tbaa !5
  %41 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #4
  %42 = load i32, ptr %41, align 4, !tbaa !5
  call void @_Z3DFSi(i32 noundef %42)
  br label %43

43:                                               ; preds = %35, %27
  br label %44

44:                                               ; preds = %43
  %45 = call ptr @_ZNSt14_List_iteratorIiEppEi(ptr noundef nonnull align 8 dereferenceable(8) %3, i32 noundef 0) #4
  %46 = getelementptr inbounds %"struct.std::_List_iterator", ptr %6, i32 0, i32 0
  store ptr %45, ptr %46, align 8
  br label %19, !llvm.loop !12

47:                                               ; preds = %19
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #4
  ret void
}

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt14_List_iteratorIiEC2Ev(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt7__cxx114listIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #3

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZStneRKSt14_List_iteratorIiES2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt7__cxx114listIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt14_List_iteratorIiEppEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #2 align 2

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 = { 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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{i64 0, i64 8, !9}
!12 = distinct !{!12, !13}
!13 = !{!"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"

%"struct.std::_List_iterator" = type { ptr }
%"class.std::__cxx11::list" = type { %"class.std::__cxx11::_List_base" }
%"class.std::__cxx11::_List_base" = type { %"struct.std::__cxx11::_List_base<int, std::allocator<int>>::_List_impl" }
%"struct.std::__cxx11::_List_base<int, std::allocator<int>>::_List_impl" = type { %"struct.std::__detail::_List_node_header" }
%"struct.std::__detail::_List_node_header" = type { %"struct.std::__detail::_List_node_base", i64 }
%"struct.std::__detail::_List_node_base" = type { ptr, ptr }

@_Z2adB5cxx11 = external dso_local local_unnamed_addr global ptr, align 8
@visited = external dso_local local_unnamed_addr global ptr, align 8
@vertices = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3DFSi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = alloca %"struct.std::_List_iterator", align 8
  %3 = alloca %"struct.std::_List_iterator", align 8
  %4 = load ptr, ptr @visited, align 8, !tbaa !5
  %5 = sext i32 %0 to i64
  %6 = getelementptr inbounds i32, ptr %4, i64 %5
  store i32 1, ptr %6, align 4, !tbaa !9
  %7 = load i32, ptr @vertices, align 4, !tbaa !9
  %8 = add nsw i32 %7, 1
  store i32 %8, ptr @vertices, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #2
  call void @_ZNSt14_List_iteratorIiEC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %2) #2
  %9 = load ptr, ptr @_Z2adB5cxx11, align 8, !tbaa !5
  %10 = getelementptr inbounds %"class.std::__cxx11::list", ptr %9, i64 %5
  %11 = call ptr @_ZNSt7__cxx114listIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %10) #2
  store ptr %11, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #2
  %12 = load ptr, ptr @_Z2adB5cxx11, align 8, !tbaa !5
  %13 = getelementptr inbounds %"class.std::__cxx11::list", ptr %12, i64 %5
  %14 = call ptr @_ZNSt7__cxx114listIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %13) #2
  store ptr %14, ptr %3, align 8
  %15 = call noundef zeroext i1 @_ZStneRKSt14_List_iteratorIiES2_(ptr noundef nonnull align 8 dereferenceable(8) %2, ptr noundef nonnull align 8 dereferenceable(8) %3) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #2
  br i1 %15, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1, %31
  %16 = load ptr, ptr @visited, align 8, !tbaa !5
  %17 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %2) #2
  %18 = load i32, ptr %17, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds i32, ptr %16, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !9
  %22 = icmp eq i32 %21, 0
  br i1 %22, label %23, label %31

23:                                               ; preds = %.lr.ph
  %24 = load ptr, ptr @visited, align 8, !tbaa !5
  %25 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %2) #2
  %26 = load i32, ptr %25, align 4, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds i32, ptr %24, i64 %27
  store i32 1, ptr %28, align 4, !tbaa !9
  %29 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %2) #2
  %30 = load i32, ptr %29, align 4, !tbaa !9
  call void @_Z3DFSi(i32 noundef %30)
  br label %31

31:                                               ; preds = %.lr.ph, %23
  %32 = call ptr @_ZNSt14_List_iteratorIiEppEi(ptr noundef nonnull align 8 dereferenceable(8) %2, i32 noundef 0) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #2
  %33 = load ptr, ptr @_Z2adB5cxx11, align 8, !tbaa !5
  %34 = getelementptr inbounds %"class.std::__cxx11::list", ptr %33, i64 %5
  %35 = call ptr @_ZNSt7__cxx114listIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %34) #2
  store ptr %35, ptr %3, align 8
  %36 = call noundef zeroext i1 @_ZStneRKSt14_List_iteratorIiES2_(ptr noundef nonnull align 8 dereferenceable(8) %2, ptr noundef nonnull align 8 dereferenceable(8) %3) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #2
  br i1 %36, label %.lr.ph, label %._crit_edge, !llvm.loop !11

._crit_edge:                                      ; preds = %31, %1
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #2
  ret void
}

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt14_List_iteratorIiEC2Ev(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt7__cxx114listIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZStneRKSt14_List_iteratorIiES2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt7__cxx114listIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt14_List_iteratorIiEppEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #0 align 2

attributes #0 = { 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 #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass