; LLVM IR from eyangch/competitive-programming :: Codeforces/1174/f.ll (Z7dfs_updxx)

; 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 @_Z7dfs_updxx(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 i8, align 1
  %8 = alloca ptr, align 8
  %9 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %10 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %11 = alloca i32, align 4
  %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 = load i64, ptr %5, align 8, !tbaa !5
  %15 = icmp eq i64 %13, %14
  br i1 %15, label %16, label %17

16:                                               ; preds = %2
  store i64 0, ptr %3, align 8
  br label %72

17:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  store i64 0, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %7) #4
  store i8 1, ptr %7, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %18 = load i64, ptr %4, align 8, !tbaa !5
  %19 = getelementptr inbounds [200000 x %"class.std::vector"], ptr @graph, i64 0, i64 %18
  store ptr %19, ptr %8, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #4
  %20 = load ptr, ptr %8, align 8, !tbaa !11
  %21 = call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %20) #4
  %22 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %9, i32 0, i32 0
  store ptr %21, ptr %22, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #4
  %23 = load ptr, ptr %8, align 8, !tbaa !11
  %24 = call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %23) #4
  %25 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %10, i32 0, i32 0
  store ptr %24, ptr %25, align 8
  br label %26

26:                                               ; preds = %59, %17
  %27 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPxSt6vectorIxSaIxEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %9, ptr noundef nonnull align 8 dereferenceable(8) %10) #4
  br i1 %27, label %29, label %28

28:                                               ; preds = %26
  store i32 2, ptr %11, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  br label %61

29:                                               ; preds = %26
  call void @llvm.lifetime.start.p0(i64 8, ptr %12) #4
  %30 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %9) #4
  %31 = load i64, ptr %30, align 8, !tbaa !5
  store i64 %31, ptr %12, align 8, !tbaa !5
  %32 = load i64, ptr %12, align 8, !tbaa !5
  %33 = getelementptr inbounds [200000 x i64], ptr @sz, i64 0, i64 %32
  %34 = load i64, ptr %33, align 8, !tbaa !5
  %35 = load i64, ptr %4, align 8, !tbaa !5
  %36 = getelementptr inbounds [200000 x i64], ptr @sz, i64 0, i64 %35
  %37 = load i64, ptr %36, align 8, !tbaa !5
  %38 = icmp sgt i64 %34, %37
  br i1 %38, label %39, label %40

39:                                               ; preds = %29
  store i32 3, ptr %11, align 4
  br label %56

40:                                               ; preds = %29
  %41 = load i64, ptr %12, align 8, !tbaa !5
  %42 = load i64, ptr %5, align 8, !tbaa !5
  %43 = icmp ne i64 %41, %42
  br i1 %43, label %44, label %50

44:                                               ; preds = %40
  %45 = load i64, ptr %12, align 8, !tbaa !5
  %46 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %45
  %47 = load i64, ptr %46, align 8, !tbaa !5
  %48 = icmp eq i64 %47, 0
  br i1 %48, label %49, label %50

49:                                               ; preds = %44
  store i32 3, ptr %11, align 4
  br label %56

50:                                               ; preds = %44, %40
  store i8 0, ptr %7, align 1, !tbaa !9
  %51 = load i64, ptr %12, align 8, !tbaa !5
  %52 = load i64, ptr %5, align 8, !tbaa !5
  %53 = call noundef i64 @_Z7dfs_updxx(i64 noundef %51, i64 noundef %52)
  %54 = load i64, ptr %6, align 8, !tbaa !5
  %55 = add nsw i64 %54, %53
  store i64 %55, ptr %6, align 8, !tbaa !5
  store i32 0, ptr %11, align 4
  br label %56

56:                                               ; preds = %50, %49, %39
  call void @llvm.lifetime.end.p0(i64 8, ptr %12) #4
  %57 = load i32, ptr %11, align 4
  switch i32 %57, label %74 [
    i32 0, label %58
    i32 3, label %59
  ]

58:                                               ; preds = %56
  br label %59

59:                                               ; preds = %58, %56
  %60 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %9) #4
  br label %26

61:                                               ; preds = %28
  %62 = load i8, ptr %7, align 1, !tbaa !9, !range !13, !noundef !14
  %63 = trunc i8 %62 to i1
  br i1 %63, label %68, label %64

64:                                               ; preds = %61
  %65 = load i64, ptr %6, align 8, !tbaa !5
  %66 = load i64, ptr %4, align 8, !tbaa !5
  %67 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %66
  store i64 %65, ptr %67, align 8, !tbaa !5
  br label %68

68:                                               ; preds = %64, %61
  %69 = load i64, ptr %4, align 8, !tbaa !5
  %70 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %69
  %71 = load i64, ptr %70, align 8, !tbaa !5
  store i64 %71, ptr %3, align 8
  store i32 1, ptr %11, align 4
  call void @llvm.lifetime.end.p0(i64 1, ptr %7) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #4
  br label %72

72:                                               ; preds = %68, %16
  %73 = load i64, ptr %3, align 8
  ret i64 %73

74:                                               ; preds = %56
  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 = !{!"bool", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"any pointer", !7, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}


; 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 @_Z7dfs_updxx(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 = icmp eq i64 %0, %1
  br i1 %5, label %32, label %6

6:                                                ; preds = %2
  %7 = 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
  %8 = tail call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %7) #3
  store ptr %8, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  %9 = tail call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %7) #3
  store ptr %9, ptr %4, align 8
  %10 = 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 %10, label %.lr.ph, label %._crit_edge.thread

._crit_edge.thread:                               ; preds = %6
  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 %._crit_edge._crit_edge

.lr.ph:                                           ; preds = %6
  %11 = getelementptr inbounds [200000 x i64], ptr @sz, i64 0, i64 %0
  br label %12

._crit_edge:                                      ; preds = %27
  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 i1 %.119, label %._crit_edge._crit_edge, label %30

._crit_edge._crit_edge:                           ; preds = %._crit_edge.thread, %._crit_edge
  %.phi.trans.insert = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %0
  %.pre = load i64, ptr %.phi.trans.insert, align 8, !tbaa !5
  br label %32

12:                                               ; preds = %.lr.ph, %27
  %.01724 = phi i64 [ 0, %.lr.ph ], [ %.1, %27 ]
  %.01823 = phi i1 [ true, %.lr.ph ], [ %.119, %27 ]
  %13 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #3
  %14 = load i64, ptr %13, align 8, !tbaa !5
  %15 = getelementptr inbounds [200000 x i64], ptr @sz, i64 0, i64 %14
  %16 = load i64, ptr %15, align 8, !tbaa !5
  %17 = load i64, ptr %11, align 8, !tbaa !5
  %18 = icmp sgt i64 %16, %17
  br i1 %18, label %27, label %19

19:                                               ; preds = %12
  %.not = icmp eq i64 %14, %1
  br i1 %.not, label %24, label %20

20:                                               ; preds = %19
  %21 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %14
  %22 = load i64, ptr %21, align 8, !tbaa !5
  %23 = icmp eq i64 %22, 0
  br i1 %23, label %27, label %24

24:                                               ; preds = %20, %19
  %25 = call noundef i64 @_Z7dfs_updxx(i64 noundef %14, i64 noundef %1)
  %26 = add nsw i64 %25, %.01724
  br label %27

27:                                               ; preds = %20, %12, %24
  %.119 = phi i1 [ false, %24 ], [ %.01823, %12 ], [ %.01823, %20 ]
  %.1 = phi i64 [ %26, %24 ], [ %.01724, %12 ], [ %.01724, %20 ]
  %28 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #3
  %29 = 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 %29, label %12, label %._crit_edge

30:                                               ; preds = %._crit_edge
  %31 = getelementptr inbounds [200000 x i64], ptr @sb, i64 0, i64 %0
  store i64 %.1, ptr %31, align 8, !tbaa !5
  br label %32

32:                                               ; preds = %30, %._crit_edge._crit_edge, %2
  %.0 = phi i64 [ 0, %2 ], [ %.pre, %._crit_edge._crit_edge ], [ %.1, %30 ]
  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: AggressiveInstCombinePass,BDCEPass,CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass