; LLVM IR from eyangch/competitive-programming :: Codeforces/1611/e2.ll (Z4dfsLxx)

; 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 }

@F = external dso_local global [200000 x i8], align 16
@mk = external dso_local global [200000 x i8], align 16
@graph = external dso_local global [200000 x %"class.std::vector"], 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 zeroext i1 @_Z4dfsLxx(i64 noundef %0, i64 noundef %1) #3 {
  %3 = alloca i1, align 1
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  %10 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %11 = alloca %"class.__gnu_cxx::__normal_iterator", 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
  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 8, ptr %7) #4
  store i64 0, ptr %7, align 8, !tbaa !5
  %13 = load i64, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds [200000 x i8], ptr @F, i64 0, i64 %13
  %15 = load i8, ptr %14, align 1, !tbaa !9, !range !11, !noundef !12
  %16 = trunc i8 %15 to i1
  br i1 %16, label %17, label %20

17:                                               ; preds = %2
  %18 = load i64, ptr %4, align 8, !tbaa !5
  %19 = getelementptr inbounds [200000 x i8], ptr @mk, i64 0, i64 %18
  store i8 1, ptr %19, align 1, !tbaa !9
  store i1 false, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %60

20:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #4
  %21 = load i64, ptr %4, align 8, !tbaa !5
  %22 = getelementptr inbounds [200000 x %"class.std::vector"], ptr @graph, i64 0, i64 %21
  store ptr %22, ptr %9, align 8, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #4
  %23 = load ptr, ptr %9, align 8, !tbaa !13
  %24 = call ptr @_ZNSt6vectorIxSaIxEE5beginEv(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
  call void @llvm.lifetime.start.p0(i64 8, ptr %11) #4
  %26 = load ptr, ptr %9, align 8, !tbaa !13
  %27 = call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %26) #4
  %28 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %11, i32 0, i32 0
  store ptr %27, ptr %28, align 8
  br label %29

29:                                               ; preds = %51, %20
  %30 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPxSt6vectorIxSaIxEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %10, ptr noundef nonnull align 8 dereferenceable(8) %11) #4
  br i1 %30, label %32, label %31

31:                                               ; preds = %29
  store i32 2, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %11) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #4
  br label %53

32:                                               ; preds = %29
  call void @llvm.lifetime.start.p0(i64 8, ptr %12) #4
  %33 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %10) #4
  %34 = load i64, ptr %33, align 8, !tbaa !5
  store i64 %34, ptr %12, align 8, !tbaa !5
  %35 = load i64, ptr %12, align 8, !tbaa !5
  %36 = load i64, ptr %5, align 8, !tbaa !5
  %37 = icmp eq i64 %35, %36
  br i1 %37, label %38, label %39

38:                                               ; preds = %32
  store i32 3, ptr %8, align 4
  br label %48

39:                                               ; preds = %32
  %40 = load i64, ptr %6, align 8, !tbaa !5
  %41 = add nsw i64 %40, 1
  store i64 %41, ptr %6, align 8, !tbaa !5
  %42 = load i64, ptr %12, align 8, !tbaa !5
  %43 = load i64, ptr %4, align 8, !tbaa !5
  %44 = call noundef zeroext i1 @_Z4dfsLxx(i64 noundef %42, i64 noundef %43)
  %45 = zext i1 %44 to i64
  %46 = load i64, ptr %7, align 8, !tbaa !5
  %47 = or i64 %46, %45
  store i64 %47, ptr %7, align 8, !tbaa !5
  store i32 0, ptr %8, align 4
  br label %48

48:                                               ; preds = %39, %38
  call void @llvm.lifetime.end.p0(i64 8, ptr %12) #4
  %49 = load i32, ptr %8, align 4
  switch i32 %49, label %62 [
    i32 0, label %50
    i32 3, label %51
  ]

50:                                               ; preds = %48
  br label %51

51:                                               ; preds = %50, %48
  %52 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %10) #4
  br label %29

53:                                               ; preds = %31
  %54 = load i64, ptr %6, align 8, !tbaa !5
  %55 = icmp eq i64 %54, 0
  br i1 %55, label %56, label %57

56:                                               ; preds = %53
  store i1 true, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %60

57:                                               ; preds = %53
  %58 = load i64, ptr %7, align 8, !tbaa !5
  %59 = icmp ne i64 %58, 0
  store i1 %59, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %60

60:                                               ; preds = %57, %56, %17
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #4
  %61 = load i1, ptr %3, align 1
  ret i1 %61

62:                                               ; preds = %48
  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 = !{i8 0, i8 2}
!12 = !{}
!13 = !{!14, !14, i64 0}
!14 = !{!"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 }

@F = external dso_local local_unnamed_addr global [200000 x i8], align 16
@mk = external dso_local local_unnamed_addr global [200000 x i8], align 16
@graph = external dso_local global [200000 x %"class.std::vector"], 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 zeroext i1 @_Z4dfsLxx(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 i8], ptr @F, i64 0, i64 %0
  %6 = load i8, ptr %5, align 1, !tbaa !5, !range !9, !noundef !10
  %7 = trunc nuw i8 %6 to i1
  br i1 %7, label %8, label %10

8:                                                ; preds = %2
  %9 = getelementptr inbounds [200000 x i8], ptr @mk, i64 0, i64 %0
  store i8 1, ptr %9, align 1, !tbaa !5
  br label %29

10:                                               ; preds = %2
  %11 = 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
  %12 = tail call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %11) #3
  store ptr %12, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  %13 = tail call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %11) #3
  store ptr %13, ptr %4, align 8
  %14 = 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 %14, label %.lr.ph, label %._crit_edge

._crit_edge.loopexit:                             ; preds = %26
  %15 = icmp eq i64 %.1, 0
  %16 = icmp ne i64 %.115, 0
  %17 = select i1 %15, i1 true, i1 %16
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %10
  %.013.lcssa = phi i1 [ true, %10 ], [ %17, %._crit_edge.loopexit ]
  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 %29

.lr.ph:                                           ; preds = %10, %26
  %.01318 = phi i64 [ %.1, %26 ], [ 0, %10 ]
  %.01417 = phi i64 [ %.115, %26 ], [ 0, %10 ]
  %18 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #3
  %19 = load i64, ptr %18, align 8, !tbaa !11
  %20 = icmp eq i64 %19, %1
  br i1 %20, label %26, label %21

21:                                               ; preds = %.lr.ph
  %22 = add nsw i64 %.01318, 1
  %23 = call noundef zeroext i1 @_Z4dfsLxx(i64 noundef %19, i64 noundef %0)
  %24 = zext i1 %23 to i64
  %25 = or i64 %.01417, %24
  br label %26

26:                                               ; preds = %.lr.ph, %21
  %.115 = phi i64 [ %25, %21 ], [ %.01417, %.lr.ph ]
  %.1 = phi i64 [ %22, %21 ], [ %.01318, %.lr.ph ]
  %27 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #3
  %28 = 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 %28, label %.lr.ph, label %._crit_edge.loopexit

29:                                               ; preds = %._crit_edge, %8
  %.0 = phi i1 [ false, %8 ], [ %.013.lcssa, %._crit_edge ]
  ret i1 %.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 = !{!"bool", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{i8 0, i8 2}
!10 = !{}
!11 = !{!12, !12, i64 0}
!12 = !{!"long long", !7, i64 0}


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