; LLVM IR from eyangch/competitive-programming :: Codeforces/1537/f.ll (Z3dfsxx)

; 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 }

@alt = external dso_local global [200000 x i64], align 16
@graph = external dso_local global [200000 x %"class.std::vector"], align 16
@bipartite = external dso_local global i8, align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsxx(i64 noundef %0, i64 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca ptr, align 8
  %6 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %7 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %8 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !5
  %9 = load i64, ptr %3, align 8, !tbaa !5
  %10 = getelementptr inbounds [200000 x i64], ptr @alt, i64 0, i64 %9
  %11 = load i64, ptr %10, align 8, !tbaa !5
  %12 = icmp eq i64 %11, -1
  br i1 %12, label %13, label %29

13:                                               ; preds = %2
  %14 = load i64, ptr %3, align 8, !tbaa !5
  %15 = icmp ne i64 %14, 0
  br i1 %15, label %16, label %23

16:                                               ; preds = %13
  %17 = load i64, ptr %4, align 8, !tbaa !5
  %18 = getelementptr inbounds [200000 x i64], ptr @alt, i64 0, i64 %17
  %19 = load i64, ptr %18, align 8, !tbaa !5
  %20 = icmp ne i64 %19, 0
  %21 = xor i1 %20, true
  %22 = zext i1 %21 to i32
  br label %24

23:                                               ; preds = %13
  br label %24

24:                                               ; preds = %23, %16
  %25 = phi i32 [ %22, %16 ], [ 0, %23 ]
  %26 = sext i32 %25 to i64
  %27 = load i64, ptr %3, align 8, !tbaa !5
  %28 = getelementptr inbounds [200000 x i64], ptr @alt, i64 0, i64 %27
  store i64 %26, ptr %28, align 8, !tbaa !5
  br label %39

29:                                               ; preds = %2
  %30 = load i64, ptr %3, align 8, !tbaa !5
  %31 = getelementptr inbounds [200000 x i64], ptr @alt, i64 0, i64 %30
  %32 = load i64, ptr %31, align 8, !tbaa !5
  %33 = load i64, ptr %4, align 8, !tbaa !5
  %34 = getelementptr inbounds [200000 x i64], ptr @alt, i64 0, i64 %33
  %35 = load i64, ptr %34, align 8, !tbaa !5
  %36 = icmp eq i64 %32, %35
  br i1 %36, label %37, label %38

37:                                               ; preds = %29
  store i8 0, ptr @bipartite, align 1, !tbaa !9
  br label %38

38:                                               ; preds = %37, %29
  br label %58

39:                                               ; preds = %24
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %40 = load i64, ptr %3, align 8, !tbaa !5
  %41 = getelementptr inbounds [200000 x %"class.std::vector"], ptr @graph, i64 0, i64 %40
  store ptr %41, ptr %5, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  %42 = load ptr, ptr %5, align 8, !tbaa !11
  %43 = call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %42) #4
  %44 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %6, i32 0, i32 0
  store ptr %43, ptr %44, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %45 = load ptr, ptr %5, align 8, !tbaa !11
  %46 = call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %45) #4
  %47 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %7, i32 0, i32 0
  store ptr %46, ptr %47, align 8
  br label %48

48:                                               ; preds = %56, %39
  %49 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPxSt6vectorIxSaIxEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %6, ptr noundef nonnull align 8 dereferenceable(8) %7) #4
  br i1 %49, label %51, label %50

50:                                               ; preds = %48
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  br label %58

51:                                               ; preds = %48
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %52 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #4
  %53 = load i64, ptr %52, align 8, !tbaa !5
  store i64 %53, ptr %8, align 8, !tbaa !5
  %54 = load i64, ptr %8, align 8, !tbaa !5
  %55 = load i64, ptr %3, align 8, !tbaa !5
  call void @_Z3dfsxx(i64 noundef %54, i64 noundef %55)
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  br label %56

56:                                               ; preds = %51
  %57 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #4
  br label %48

58:                                               ; preds = %50, %38
  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 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 = !{!"bool", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"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 }

@alt = external dso_local local_unnamed_addr global [200000 x i64], align 16
@graph = external dso_local global [200000 x %"class.std::vector"], align 16
@bipartite = external dso_local local_unnamed_addr global i8, align 1

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3dfsxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %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 @alt, i64 0, i64 %0
  %6 = load i64, ptr %5, align 8, !tbaa !5
  %7 = icmp eq i64 %6, -1
  br i1 %7, label %8, label %19

8:                                                ; preds = %2
  %.not = icmp eq i64 %0, 0
  br i1 %.not, label %13, label %9

9:                                                ; preds = %8
  %10 = getelementptr inbounds [200000 x i64], ptr @alt, i64 0, i64 %1
  %11 = load i64, ptr %10, align 8, !tbaa !5
  %.not10 = icmp eq i64 %11, 0
  %12 = zext i1 %.not10 to i64
  br label %13

13:                                               ; preds = %8, %9
  %14 = phi i64 [ %12, %9 ], [ 0, %8 ]
  store i64 %14, ptr %5, align 8, !tbaa !5
  %15 = 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
  %16 = tail call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %15) #3
  store ptr %16, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  %17 = tail call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %15) #3
  store ptr %17, ptr %4, align 8
  %18 = 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 %18, label %.lr.ph, label %._crit_edge

19:                                               ; preds = %2
  %20 = getelementptr inbounds [200000 x i64], ptr @alt, i64 0, i64 %1
  %21 = load i64, ptr %20, align 8, !tbaa !5
  %22 = icmp eq i64 %6, %21
  br i1 %22, label %23, label %28

23:                                               ; preds = %19
  store i8 0, ptr @bipartite, align 1, !tbaa !9
  br label %28

._crit_edge:                                      ; preds = %.lr.ph, %13
  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 %28

.lr.ph:                                           ; preds = %13, %.lr.ph
  %24 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #3
  %25 = load i64, ptr %24, align 8, !tbaa !5
  call void @_Z3dfsxx(i64 noundef %25, i64 noundef %0)
  %26 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #3
  %27 = 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 %27, label %.lr.ph, label %._crit_edge

28:                                               ; preds = %19, %23, %._crit_edge
  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 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"}
!9 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}


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