; LLVM IR from eyangch/competitive-programming :: Codeforces/1547/g.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 }

@ans = external dso_local global [400000 x i64], align 16
@vis = external dso_local global [3 x [400000 x i64]], align 16
@graph = external dso_local global [400000 x %"class.std::vector"], align 16

; 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 %4, align 8, !tbaa !5
  %10 = getelementptr inbounds [3 x [400000 x i64]], ptr @vis, i64 0, i64 %9
  %11 = load i64, ptr %3, align 8, !tbaa !5
  %12 = getelementptr inbounds [400000 x i64], ptr %10, i64 0, i64 %11
  %13 = load i64, ptr %12, align 8, !tbaa !5
  %14 = icmp eq i64 %13, 2
  br i1 %14, label %15, label %21

15:                                               ; preds = %2
  %16 = load i64, ptr %4, align 8, !tbaa !5
  %17 = icmp slt i64 %16, 2
  br i1 %17, label %18, label %20

18:                                               ; preds = %15
  %19 = load i64, ptr %3, align 8, !tbaa !5
  call void @_Z3dfsxx(i64 noundef %19, i64 noundef 2)
  br label %20

20:                                               ; preds = %18, %15
  br label %68

21:                                               ; preds = %2
  %22 = load i64, ptr %4, align 8, !tbaa !5
  %23 = getelementptr inbounds [3 x [400000 x i64]], ptr @vis, i64 0, i64 %22
  %24 = load i64, ptr %3, align 8, !tbaa !5
  %25 = getelementptr inbounds [400000 x i64], ptr %23, i64 0, i64 %24
  %26 = load i64, ptr %25, align 8, !tbaa !5
  %27 = icmp eq i64 %26, 1
  br i1 %27, label %28, label %34

28:                                               ; preds = %21
  %29 = load i64, ptr %4, align 8, !tbaa !5
  %30 = icmp slt i64 %29, 1
  br i1 %30, label %31, label %33

31:                                               ; preds = %28
  %32 = load i64, ptr %3, align 8, !tbaa !5
  call void @_Z3dfsxx(i64 noundef %32, i64 noundef 1)
  br label %33

33:                                               ; preds = %31, %28
  br label %68

34:                                               ; preds = %21
  %35 = load i64, ptr %3, align 8, !tbaa !5
  %36 = getelementptr inbounds [400000 x i64], ptr @ans, i64 0, i64 %35
  %37 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %36, ptr noundef nonnull align 8 dereferenceable(8) %4)
  %38 = load i64, ptr %37, align 8, !tbaa !5
  %39 = load i64, ptr %3, align 8, !tbaa !5
  %40 = getelementptr inbounds [400000 x i64], ptr @ans, i64 0, i64 %39
  store i64 %38, ptr %40, align 8, !tbaa !5
  %41 = load i64, ptr %4, align 8, !tbaa !5
  %42 = getelementptr inbounds [3 x [400000 x i64]], ptr @vis, i64 0, i64 %41
  %43 = load i64, ptr %3, align 8, !tbaa !5
  %44 = getelementptr inbounds [400000 x i64], ptr %42, i64 0, i64 %43
  store i64 2, ptr %44, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %45 = load i64, ptr %3, align 8, !tbaa !5
  %46 = getelementptr inbounds [400000 x %"class.std::vector"], ptr @graph, i64 0, i64 %45
  store ptr %46, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  %47 = load ptr, ptr %5, align 8, !tbaa !9
  %48 = call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %47) #4
  %49 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %6, i32 0, i32 0
  store ptr %48, ptr %49, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %50 = load ptr, ptr %5, align 8, !tbaa !9
  %51 = call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %50) #4
  %52 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %7, i32 0, i32 0
  store ptr %51, ptr %52, align 8
  br label %53

53:                                               ; preds = %61, %34
  %54 = 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 %54, label %56, label %55

55:                                               ; preds = %53
  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 %63

56:                                               ; preds = %53
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %57 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #4
  %58 = load i64, ptr %57, align 8, !tbaa !5
  store i64 %58, ptr %8, align 8, !tbaa !5
  %59 = load i64, ptr %8, align 8, !tbaa !5
  %60 = load i64, ptr %4, align 8, !tbaa !5
  call void @_Z3dfsxx(i64 noundef %59, i64 noundef %60)
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  br label %61

61:                                               ; preds = %56
  %62 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #4
  br label %53

63:                                               ; preds = %55
  %64 = load i64, ptr %4, align 8, !tbaa !5
  %65 = getelementptr inbounds [3 x [400000 x i64]], ptr @vis, i64 0, i64 %64
  %66 = load i64, ptr %3, align 8, !tbaa !5
  %67 = getelementptr inbounds [400000 x i64], ptr %65, i64 0, i64 %66
  store i64 1, ptr %67, align 8, !tbaa !5
  br label %68

68:                                               ; preds = %63, %33, %20
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) #3 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) #3 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)) #1

; 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)) #3 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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)) #3 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 = { 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 #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 }

@ans = external dso_local global [400000 x i64], align 16
@vis = external dso_local local_unnamed_addr global [3 x [400000 x i64]], align 16
@graph = external dso_local global [400000 x %"class.std::vector"], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3dfsxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = alloca i64, align 8
  %4 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %5 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  br label %tailrecurse

tailrecurse:                                      ; preds = %tailrecurse.backedge, %2
  %.tr11 = phi i64 [ %1, %2 ], [ %7, %tailrecurse.backedge ]
  %6 = getelementptr inbounds [3 x [400000 x i64]], ptr @vis, i64 0, i64 %.tr11, i64 %0
  %7 = load i64, ptr %6, align 8, !tbaa !5
  switch i64 %7, label %12 [
    i64 2, label %8
    i64 1, label %10
  ]

8:                                                ; preds = %tailrecurse
  %9 = icmp slt i64 %.tr11, 2
  br i1 %9, label %tailrecurse.backedge, label %.loopexit

tailrecurse.backedge:                             ; preds = %8, %10
  br label %tailrecurse

10:                                               ; preds = %tailrecurse
  %11 = icmp slt i64 %.tr11, 1
  br i1 %11, label %tailrecurse.backedge, label %.loopexit

12:                                               ; preds = %tailrecurse
  store i64 %.tr11, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds [400000 x i64], ptr @ans, i64 0, i64 %0
  %14 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %13, ptr noundef nonnull align 8 dereferenceable(8) %3)
  %15 = load i64, ptr %14, align 8, !tbaa !5
  store i64 %15, ptr %13, align 8, !tbaa !5
  %16 = load i64, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds [3 x [400000 x i64]], ptr @vis, i64 0, i64 %16, i64 %0
  store i64 2, ptr %17, align 8, !tbaa !5
  %18 = getelementptr inbounds [400000 x %"class.std::vector"], ptr @graph, i64 0, i64 %0
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  %19 = call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %18) #3
  store ptr %19, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %5) #3
  %20 = call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %18) #3
  store ptr %20, ptr %5, align 8
  %21 = 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 %21, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %12
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #3
  %22 = load i64, ptr %3, align 8, !tbaa !5
  %23 = getelementptr inbounds [3 x [400000 x i64]], ptr @vis, i64 0, i64 %22, i64 %0
  store i64 1, ptr %23, align 8, !tbaa !5
  br label %.loopexit

.lr.ph:                                           ; preds = %12, %.lr.ph
  %24 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %4) #3
  %25 = load i64, ptr %24, align 8, !tbaa !5
  %26 = load i64, ptr %3, align 8, !tbaa !5
  call void @_Z3dfsxx(i64 noundef %25, i64 noundef %26)
  %27 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %4) #3
  %28 = 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 %28, label %.lr.ph, label %._crit_edge

.loopexit:                                        ; preds = %10, %8, %._crit_edge
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; 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 #1

; 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) #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 #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 = { 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 #2 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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: DSEPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass