; LLVM IR from eyangch/competitive-programming :: Codeforces/1675/f.ll (Z7dfs_subxxx)

; 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 }

@M = external dso_local global [200000 x i64], align 16
@D = external dso_local global [200000 x i64], align 16
@S = external dso_local global [200000 x i64], align 16
@G = external dso_local global [200000 x %"class.std::vector"], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z7dfs_subxxx(i64 noundef %0, i64 noundef %1, i64 noundef %2) #0 {
  %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
  store i64 %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !5
  %12 = load i64, ptr %4, align 8, !tbaa !5
  %13 = getelementptr inbounds [200000 x i64], ptr @M, i64 0, i64 %12
  %14 = load i64, ptr %13, align 8, !tbaa !5
  %15 = load i64, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds [200000 x i64], ptr @S, i64 0, i64 %15
  store i64 %14, ptr %16, align 8, !tbaa !5
  %17 = load i64, ptr %6, align 8, !tbaa !5
  %18 = load i64, ptr %4, align 8, !tbaa !5
  %19 = getelementptr inbounds [200000 x i64], ptr @D, i64 0, i64 %18
  store i64 %17, ptr %19, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %20 = load i64, ptr %4, align 8, !tbaa !5
  %21 = getelementptr inbounds [200000 x %"class.std::vector"], ptr @G, i64 0, i64 %20
  store ptr %21, ptr %7, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %22 = load ptr, ptr %7, align 8, !tbaa !9
  %23 = call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %22) #4
  %24 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %8, i32 0, i32 0
  store ptr %23, ptr %24, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #4
  %25 = load ptr, ptr %7, align 8, !tbaa !9
  %26 = call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %25) #4
  %27 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %9, i32 0, i32 0
  store ptr %26, ptr %27, align 8
  br label %28

28:                                               ; preds = %53, %3
  %29 = 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 %29, label %31, label %30

30:                                               ; preds = %28
  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 %55

31:                                               ; preds = %28
  call void @llvm.lifetime.start.p0(i64 8, ptr %11) #4
  %32 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %8) #4
  %33 = load i64, ptr %32, align 8, !tbaa !5
  store i64 %33, ptr %11, align 8, !tbaa !5
  %34 = load i64, ptr %11, align 8, !tbaa !5
  %35 = load i64, ptr %5, align 8, !tbaa !5
  %36 = icmp eq i64 %34, %35
  br i1 %36, label %37, label %38

37:                                               ; preds = %31
  store i32 3, ptr %10, align 4
  br label %50

38:                                               ; preds = %31
  %39 = load i64, ptr %11, align 8, !tbaa !5
  %40 = load i64, ptr %4, align 8, !tbaa !5
  %41 = load i64, ptr %6, align 8, !tbaa !5
  %42 = add nsw i64 %41, 1
  call void @_Z7dfs_subxxx(i64 noundef %39, i64 noundef %40, i64 noundef %42)
  %43 = load i64, ptr %11, align 8, !tbaa !5
  %44 = getelementptr inbounds [200000 x i64], ptr @S, i64 0, i64 %43
  %45 = load i64, ptr %44, align 8, !tbaa !5
  %46 = load i64, ptr %4, align 8, !tbaa !5
  %47 = getelementptr inbounds [200000 x i64], ptr @S, i64 0, i64 %46
  %48 = load i64, ptr %47, align 8, !tbaa !5
  %49 = add nsw i64 %48, %45
  store i64 %49, ptr %47, align 8, !tbaa !5
  store i32 0, ptr %10, align 4
  br label %50

50:                                               ; preds = %38, %37
  call void @llvm.lifetime.end.p0(i64 8, ptr %11) #4
  %51 = load i32, ptr %10, align 4
  switch i32 %51, label %56 [
    i32 0, label %52
    i32 3, label %53
  ]

52:                                               ; preds = %50
  br label %53

53:                                               ; preds = %52, %50
  %54 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %8) #4
  br label %28

55:                                               ; preds = %30
  ret void

56:                                               ; preds = %50
  unreachable
}

; 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 ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 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)) #3

; 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)) #2 align 2

; 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 nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8)) #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 = { 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 #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 }

@M = external dso_local local_unnamed_addr global [200000 x i64], align 16
@D = external dso_local local_unnamed_addr global [200000 x i64], align 16
@S = external dso_local local_unnamed_addr global [200000 x i64], align 16
@G = external dso_local global [200000 x %"class.std::vector"], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z7dfs_subxxx(i64 noundef %0, i64 noundef %1, i64 noundef %2) local_unnamed_addr #0 {
  %4 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %5 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %6 = getelementptr inbounds [200000 x i64], ptr @M, i64 0, i64 %0
  %7 = load i64, ptr %6, align 8, !tbaa !5
  %8 = getelementptr inbounds [200000 x i64], ptr @S, i64 0, i64 %0
  store i64 %7, ptr %8, align 8, !tbaa !5
  %9 = getelementptr inbounds [200000 x i64], ptr @D, i64 0, i64 %0
  store i64 %2, ptr %9, align 8, !tbaa !5
  %10 = getelementptr inbounds [200000 x %"class.std::vector"], ptr @G, i64 0, i64 %0
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  %11 = tail call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %10) #3
  store ptr %11, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %5) #3
  %12 = tail call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %10) #3
  store ptr %12, ptr %5, align 8
  %13 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPxSt6vectorIxSaIxEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %4, ptr noundef nonnull align 8 dereferenceable(8) %5) #3
  br i1 %13, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3
  %14 = add nsw i64 %2, 1
  br label %15

._crit_edge:                                      ; preds = %24, %3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #3
  ret void

15:                                               ; preds = %.lr.ph, %24
  %16 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %4) #3
  %17 = load i64, ptr %16, align 8, !tbaa !5
  %18 = icmp eq i64 %17, %1
  br i1 %18, label %24, label %19

19:                                               ; preds = %15
  call void @_Z7dfs_subxxx(i64 noundef %17, i64 noundef %0, i64 noundef %14)
  %20 = getelementptr inbounds [200000 x i64], ptr @S, i64 0, i64 %17
  %21 = load i64, ptr %20, align 8, !tbaa !5
  %22 = load i64, ptr %8, align 8, !tbaa !5
  %23 = add nsw i64 %22, %21
  store i64 %23, ptr %8, align 8, !tbaa !5
  br label %24

24:                                               ; preds = %15, %19
  %25 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %4) #3
  %26 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPxSt6vectorIxSaIxEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %4, ptr noundef nonnull align 8 dereferenceable(8) %5) #3
  br i1 %26, label %15, label %._crit_edge
}

; 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 ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 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 #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 nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8)) 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 = { 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,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass