; LLVM IR from eyangch/competitive-programming :: Codeforces/1174/f.ll (Z6dfs_tdxx)

; 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::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl" }
%"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl" = type { %"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl_data" }
%"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.__gnu_cxx::__normal_iterator" = type { ptr }

@graph = external dso_local global [200000 x %"class.std::vector"], align 16
@sz = external dso_local global [200000 x i64], align 16
@sb = external dso_local global [200000 x i64], align 16

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

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) #1 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZN9__gnu_cxxneIPxSt6vectorIxSaIxEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8)) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z6dfs_tdxx(i64 noundef %0, i64 noundef %1) #3 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca ptr, align 8
  %8 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %9 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %10 = alloca i32, align 4
  %11 = alloca i64, align 8
  %12 = alloca i64, align 8
  store i64 %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !5
  %13 = load i64, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %13
  %15 = load i64, ptr %14, align 8, !tbaa !5
  %16 = load i64, ptr %5, align 8, !tbaa !5
  %17 = sdiv i64 %16, 3
  %18 = icmp sle i64 %15, %17
  br i1 %18, label %19, label %20

19:                                               ; preds = %2
  store i64 -1, ptr %3, align 8
  br label %88

20:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  %21 = load i64, ptr %4, align 8, !tbaa !5
  store i64 %21, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %22 = load i64, ptr %4, align 8, !tbaa !5
  %23 = getelementptr inbounds [200000 x %"class.std::vector"], ptr @graph, i64 0, i64 %22
  store ptr %23, ptr %7, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %24 = load ptr, ptr %7, align 8, !tbaa !9
  %25 = call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %24) #4
  %26 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %8, i32 0, i32 0
  store ptr %25, ptr %26, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #4
  %27 = load ptr, ptr %7, align 8, !tbaa !9
  %28 = call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %27) #4
  %29 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %9, i32 0, i32 0
  store ptr %28, ptr %29, align 8
  br label %30

30:                                               ; preds = %84, %20
  %31 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPxSt6vectorIxSaIxEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %8, ptr noundef nonnull align 8 dereferenceable(8) %9) #4
  br i1 %31, label %33, label %32

32:                                               ; preds = %30
  store i32 2, ptr %10, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #4
  br label %86

33:                                               ; preds = %30
  call void @llvm.lifetime.start.p0(i64 8, ptr %11) #4
  %34 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %8) #4
  %35 = load i64, ptr %34, align 8, !tbaa !5
  store i64 %35, ptr %11, align 8, !tbaa !5
  %36 = load i64, ptr %11, align 8, !tbaa !5
  %37 = getelementptr inbounds [200000 x i64], ptr @sz, i64 0, i64 %36
  %38 = load i64, ptr %37, align 8, !tbaa !5
  %39 = load i64, ptr %4, align 8, !tbaa !5
  %40 = getelementptr inbounds [200000 x i64], ptr @sz, i64 0, i64 %39
  %41 = load i64, ptr %40, align 8, !tbaa !5
  %42 = icmp sgt i64 %38, %41
  br i1 %42, label %43, label %44

43:                                               ; preds = %33
  store i32 3, ptr %10, align 4
  br label %81

44:                                               ; preds = %33
  call void @llvm.lifetime.start.p0(i64 8, ptr %12) #4
  %45 = load i64, ptr %11, align 8, !tbaa !5
  %46 = load i64, ptr %5, align 8, !tbaa !5
  %47 = call noundef i64 @_Z6dfs_tdxx(i64 noundef %45, i64 noundef %46)
  store i64 %47, ptr %12, align 8, !tbaa !5
  %48 = load i64, ptr %12, align 8, !tbaa !5
  %49 = icmp eq i64 %48, -1
  br i1 %49, label %50, label %51

50:                                               ; preds = %44
  store i32 3, ptr %10, align 4
  br label %78

51:                                               ; preds = %44
  %52 = load i64, ptr %12, align 8, !tbaa !5
  %53 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %52
  %54 = load i64, ptr %53, align 8, !tbaa !5
  %55 = load i64, ptr %6, align 8, !tbaa !5
  %56 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %55
  %57 = load i64, ptr %56, align 8, !tbaa !5
  %58 = icmp slt i64 %54, %57
  br i1 %58, label %75, label %59

59:                                               ; preds = %51
  %60 = load i64, ptr %12, align 8, !tbaa !5
  %61 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %60
  %62 = load i64, ptr %61, align 8, !tbaa !5
  %63 = load i64, ptr %6, align 8, !tbaa !5
  %64 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %63
  %65 = load i64, ptr %64, align 8, !tbaa !5
  %66 = icmp eq i64 %62, %65
  br i1 %66, label %67, label %77

67:                                               ; preds = %59
  %68 = load i64, ptr %12, align 8, !tbaa !5
  %69 = getelementptr inbounds [200000 x i64], ptr @sz, i64 0, i64 %68
  %70 = load i64, ptr %69, align 8, !tbaa !5
  %71 = load i64, ptr %6, align 8, !tbaa !5
  %72 = getelementptr inbounds [200000 x i64], ptr @sz, i64 0, i64 %71
  %73 = load i64, ptr %72, align 8, !tbaa !5
  %74 = icmp slt i64 %70, %73
  br i1 %74, label %75, label %77

75:                                               ; preds = %67, %51
  %76 = load i64, ptr %12, align 8, !tbaa !5
  store i64 %76, ptr %6, align 8, !tbaa !5
  br label %77

77:                                               ; preds = %75, %67, %59
  store i32 0, ptr %10, align 4
  br label %78

78:                                               ; preds = %77, %50
  call void @llvm.lifetime.end.p0(i64 8, ptr %12) #4
  %79 = load i32, ptr %10, align 4
  switch i32 %79, label %81 [
    i32 0, label %80
  ]

80:                                               ; preds = %78
  store i32 0, ptr %10, align 4
  br label %81

81:                                               ; preds = %80, %78, %43
  call void @llvm.lifetime.end.p0(i64 8, ptr %11) #4
  %82 = load i32, ptr %10, align 4
  switch i32 %82, label %90 [
    i32 0, label %83
    i32 3, label %84
  ]

83:                                               ; preds = %81
  br label %84

84:                                               ; preds = %83, %81
  %85 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %8) #4
  br label %30

86:                                               ; preds = %32
  %87 = load i64, ptr %6, align 8, !tbaa !5
  store i64 %87, ptr %3, align 8
  store i32 1, ptr %10, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #4
  br label %88

88:                                               ; preds = %86, %19
  %89 = load i64, ptr %3, align 8
  ret i64 %89

90:                                               ; preds = %81
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { inlinehint 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 = { 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 #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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}


; 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::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl" }
%"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl" = type { %"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl_data" }
%"struct.std::_Vector_base<long long, std::allocator<long long>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.__gnu_cxx::__normal_iterator" = type { ptr }

@graph = external dso_local global [200000 x %"class.std::vector"], align 16
@sz = external dso_local local_unnamed_addr global [200000 x i64], align 16
@sb = external dso_local local_unnamed_addr global [200000 x i64], align 16

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

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #1 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZN9__gnu_cxxneIPxSt6vectorIxSaIxEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z6dfs_tdxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #1 {
  %3 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %4 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %5 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %0
  %6 = load i64, ptr %5, align 8, !tbaa !5
  %7 = sdiv i64 %1, 3
  %.not = icmp sgt i64 %6, %7
  br i1 %.not, label %8, label %42

8:                                                ; preds = %2
  %9 = getelementptr inbounds [200000 x %"class.std::vector"], ptr @graph, i64 0, i64 %0
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  %10 = tail call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %9) #3
  store ptr %10, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  %11 = tail call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %9) #3
  store ptr %11, ptr %4, align 8
  %12 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPxSt6vectorIxSaIxEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %3, ptr noundef nonnull align 8 dereferenceable(8) %4) #3
  br i1 %12, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %8
  %13 = getelementptr inbounds [200000 x i64], ptr @sz, i64 0, i64 %0
  br label %14

._crit_edge:                                      ; preds = %39, %8
  %.020.lcssa = phi i64 [ %0, %8 ], [ %.3, %39 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  br label %42

14:                                               ; preds = %.lr.ph, %39
  %.02025 = phi i64 [ %0, %.lr.ph ], [ %.3, %39 ]
  %15 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #3
  %16 = load i64, ptr %15, align 8, !tbaa !5
  %17 = getelementptr inbounds [200000 x i64], ptr @sz, i64 0, i64 %16
  %18 = load i64, ptr %17, align 8, !tbaa !5
  %19 = load i64, ptr %13, align 8, !tbaa !5
  %20 = icmp sgt i64 %18, %19
  br i1 %20, label %39, label %21

21:                                               ; preds = %14
  %22 = call noundef i64 @_Z6dfs_tdxx(i64 noundef %16, i64 noundef %1)
  %23 = icmp eq i64 %22, -1
  br i1 %23, label %39, label %24

24:                                               ; preds = %21
  %25 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %22
  %26 = load i64, ptr %25, align 8, !tbaa !5
  %27 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %.02025
  %28 = load i64, ptr %27, align 8, !tbaa !5
  %29 = icmp slt i64 %26, %28
  br i1 %29, label %38, label %30

30:                                               ; preds = %24
  %31 = icmp eq i64 %26, %28
  br i1 %31, label %32, label %39

32:                                               ; preds = %30
  %33 = getelementptr inbounds [200000 x i64], ptr @sz, i64 0, i64 %22
  %34 = load i64, ptr %33, align 8, !tbaa !5
  %35 = getelementptr inbounds [200000 x i64], ptr @sz, i64 0, i64 %.02025
  %36 = load i64, ptr %35, align 8, !tbaa !5
  %37 = icmp slt i64 %34, %36
  br i1 %37, label %38, label %39

38:                                               ; preds = %32, %24
  br label %39

39:                                               ; preds = %21, %38, %32, %30, %14
  %.3 = phi i64 [ %.02025, %14 ], [ %.02025, %21 ], [ %22, %38 ], [ %.02025, %32 ], [ %.02025, %30 ]
  %40 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #3
  %41 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPxSt6vectorIxSaIxEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %3, ptr noundef nonnull align 8 dereferenceable(8) %4) #3
  br i1 %41, label %14, label %._crit_edge

42:                                               ; preds = %2, %._crit_edge
  %.0 = phi i64 [ %.020.lcssa, %._crit_edge ], [ -1, %2 ]
  ret i64 %.0
}

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { inlinehint 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 = { 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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


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