; LLVM IR from Tunghohin/Competitive_Coding :: Daimayuan/795.ll (Z3dfsii)

; 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<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%struct.edge = type { i32, i32 }
%"struct.std::pair" = type { i32, i32 }

@timestamp = external dso_local global i32, align 4
@L = external dso_local global [200010 x i32], align 16
@R = external dso_local global [200010 x i32], align 16
@son = external dso_local global [200010 x %"class.std::vector"], align 16
@e = external dso_local global [400020 x %struct.edge], align 16
@head = external dso_local global [200010 x i32], 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 uwtable
define dso_local void @_Z3dfsii(i32 noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca %"struct.std::pair", align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  %9 = load i32, ptr @timestamp, align 4, !tbaa !5
  %10 = add nsw i32 %9, 1
  store i32 %10, ptr @timestamp, align 4, !tbaa !5
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [200010 x i32], ptr @L, i64 0, i64 %12
  store i32 %10, ptr %13, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [200010 x i32], ptr @head, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  store i32 %17, ptr %5, align 4, !tbaa !5
  br label %18

18:                                               ; preds = %47, %2
  %19 = load i32, ptr %5, align 4, !tbaa !5
  %20 = icmp ne i32 %19, 0
  br i1 %20, label %22, label %21

21:                                               ; preds = %18
  store i32 2, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  br label %53

22:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %23 = load i32, ptr %5, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [400020 x %struct.edge], ptr @e, i64 0, i64 %24
  %26 = getelementptr inbounds %struct.edge, ptr %25, i32 0, i32 0
  %27 = load i32, ptr %26, align 8, !tbaa !9
  store i32 %27, ptr %7, align 4, !tbaa !5
  %28 = load i32, ptr %7, align 4, !tbaa !5
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = icmp eq i32 %28, %29
  br i1 %30, label %31, label %32

31:                                               ; preds = %22
  store i32 4, ptr %6, align 4
  br label %44

32:                                               ; preds = %22
  %33 = load i32, ptr %7, align 4, !tbaa !5
  %34 = load i32, ptr %3, align 4, !tbaa !5
  call void @_Z3dfsii(i32 noundef %33, i32 noundef %34)
  %35 = load i32, ptr %3, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds [200010 x %"class.std::vector"], ptr @son, i64 0, i64 %36
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %38 = load i32, ptr %7, align 4, !tbaa !5
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds [200010 x i32], ptr @L, i64 0, i64 %39
  %41 = load i32, ptr %7, align 4, !tbaa !5
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds [200010 x i32], ptr @R, i64 0, i64 %42
  call void @_ZNSt4pairIiiEC2IRiS2_TnNSt9enable_ifIXaaclsr5_PCCPE22_MoveConstructiblePairIT_T0_EEclsr5_PCCPE30_ImplicitlyMoveConvertiblePairIS4_S5_EEEbE4typeELb1EEEOS4_OS5_(ptr noundef nonnull align 4 dereferenceable(8) %8, ptr noundef nonnull align 4 dereferenceable(4) %40, ptr noundef nonnull align 4 dereferenceable(4) %43)
  call void @_ZNSt6vectorISt4pairIiiESaIS1_EE9push_backEOS1_(ptr noundef nonnull align 8 dereferenceable(24) %37, ptr noundef nonnull align 4 dereferenceable(8) %8)
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  store i32 0, ptr %6, align 4
  br label %44

44:                                               ; preds = %32, %31
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  %45 = load i32, ptr %6, align 4
  switch i32 %45, label %58 [
    i32 0, label %46
    i32 4, label %47
  ]

46:                                               ; preds = %44
  br label %47

47:                                               ; preds = %46, %44
  %48 = load i32, ptr %5, align 4, !tbaa !5
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds [400020 x %struct.edge], ptr @e, i64 0, i64 %49
  %51 = getelementptr inbounds %struct.edge, ptr %50, i32 0, i32 1
  %52 = load i32, ptr %51, align 4, !tbaa !11
  store i32 %52, ptr %5, align 4, !tbaa !5
  br label %18, !llvm.loop !12

53:                                               ; preds = %21
  %54 = load i32, ptr @timestamp, align 4, !tbaa !5
  %55 = load i32, ptr %3, align 4, !tbaa !5
  %56 = sext i32 %55 to i64
  %57 = getelementptr inbounds [200010 x i32], ptr @R, i64 0, i64 %56
  store i32 %54, ptr %57, align 4, !tbaa !5
  ret void

58:                                               ; preds = %44
  unreachable
}

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorISt4pairIiiESaIS1_EE9push_backEOS1_(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(8)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt4pairIiiEC2IRiS2_TnNSt9enable_ifIXaaclsr5_PCCPE22_MoveConstructiblePairIT_T0_EEclsr5_PCCPE30_ImplicitlyMoveConvertiblePairIS4_S5_EEEbE4typeELb1EEEOS4_OS5_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) unnamed_addr #2 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 0}
!10 = !{!"_ZTS4edge", !6, i64 0, !6, i64 4}
!11 = !{!10, !6, i64 4}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; 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<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::pair<int, int>, std::allocator<std::pair<int, int>>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%struct.edge = type { i32, i32 }
%"struct.std::pair" = type { i32, i32 }

@timestamp = external dso_local local_unnamed_addr global i32, align 4
@L = external dso_local global [200010 x i32], align 16
@R = external dso_local global [200010 x i32], align 16
@son = external dso_local global [200010 x %"class.std::vector"], align 16
@e = external dso_local local_unnamed_addr global [400020 x %struct.edge], align 16
@head = external dso_local local_unnamed_addr global [200010 x i32], 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 uwtable
define dso_local void @_Z3dfsii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = alloca %"struct.std::pair", align 4
  %4 = load i32, ptr @timestamp, align 4, !tbaa !5
  %5 = add nsw i32 %4, 1
  store i32 %5, ptr @timestamp, align 4, !tbaa !5
  %6 = sext i32 %0 to i64
  %7 = getelementptr inbounds [200010 x i32], ptr @L, i64 0, i64 %6
  store i32 %5, ptr %7, align 4, !tbaa !5
  %8 = getelementptr inbounds [200010 x i32], ptr @head, i64 0, i64 %6
  %.014 = load i32, ptr %8, align 4, !tbaa !5
  %.not15 = icmp eq i32 %.014, 0
  br i1 %.not15, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2
  %9 = getelementptr inbounds [200010 x %"class.std::vector"], ptr @son, i64 0, i64 %6
  br label %12

._crit_edge.loopexit:                             ; preds = %21
  %.pre = load i32, ptr @timestamp, align 4, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %2
  %10 = phi i32 [ %.pre, %._crit_edge.loopexit ], [ %5, %2 ]
  %11 = getelementptr inbounds [200010 x i32], ptr @R, i64 0, i64 %6
  store i32 %10, ptr %11, align 4, !tbaa !5
  ret void

12:                                               ; preds = %.lr.ph, %21
  %.016 = phi i32 [ %.014, %.lr.ph ], [ %.0, %21 ]
  %13 = sext i32 %.016 to i64
  %14 = getelementptr inbounds [400020 x %struct.edge], ptr @e, i64 0, i64 %13
  %15 = load i32, ptr %14, align 8, !tbaa !9
  %16 = icmp eq i32 %15, %1
  br i1 %16, label %21, label %17

17:                                               ; preds = %12
  call void @_Z3dfsii(i32 noundef %15, i32 noundef %0)
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  %18 = sext i32 %15 to i64
  %19 = getelementptr inbounds [200010 x i32], ptr @L, i64 0, i64 %18
  %20 = getelementptr inbounds [200010 x i32], ptr @R, i64 0, i64 %18
  call void @_ZNSt4pairIiiEC2IRiS2_TnNSt9enable_ifIXaaclsr5_PCCPE22_MoveConstructiblePairIT_T0_EEclsr5_PCCPE30_ImplicitlyMoveConvertiblePairIS4_S5_EEEbE4typeELb1EEEOS4_OS5_(ptr noundef nonnull align 4 dereferenceable(8) %3, ptr noundef nonnull align 4 dereferenceable(4) %19, ptr noundef nonnull align 4 dereferenceable(4) %20)
  call void @_ZNSt6vectorISt4pairIiiESaIS1_EE9push_backEOS1_(ptr noundef nonnull align 8 dereferenceable(24) %9, ptr noundef nonnull align 4 dereferenceable(8) %3)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  br label %21

21:                                               ; preds = %12, %17
  %22 = getelementptr inbounds i8, ptr %14, i64 4
  %.0 = load i32, ptr %22, align 4, !tbaa !5
  %.not = icmp eq i32 %.0, 0
  br i1 %.not, label %._crit_edge.loopexit, label %12, !llvm.loop !11
}

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorISt4pairIiiESaIS1_EE9push_backEOS1_(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(8)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt4pairIiiEC2IRiS2_TnNSt9enable_ifIXaaclsr5_PCCPE22_MoveConstructiblePairIT_T0_EEclsr5_PCCPE30_ImplicitlyMoveConvertiblePairIS4_S5_EEEbE4typeELb1EEEOS4_OS5_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) unnamed_addr #2 align 2

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 0}
!10 = !{!"_ZTS4edge", !6, i64 0, !6, i64 4}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,LICMPass,LoopRotatePass,LoopSimplifyPass,SROAPass,SimplifyCFGPass