; LLVM IR from eyangch/competitive-programming :: USACOcontests/platinum/2020.01/cave.ll (Z3dfsxxxx)

; 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 }

@par = external dso_local global [1000 x [1000 x i64]], align 16
@graph = external dso_local global [2 x [1000 x %"class.std::vector"]], align 16
@vis = external dso_local global [2 x [1000 x i8]], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsxxxx(i64 noundef %0, i64 noundef %1, i64 noundef %2, i64 noundef %3) #0 {
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  %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 %5, align 8, !tbaa !5
  store i64 %1, ptr %6, align 8, !tbaa !5
  store i64 %2, ptr %7, align 8, !tbaa !5
  store i64 %3, ptr %8, align 8, !tbaa !5
  %13 = load i64, ptr %5, align 8, !tbaa !5
  %14 = getelementptr inbounds [2 x [1000 x i8]], ptr @vis, i64 0, i64 %13
  %15 = load i64, ptr %6, align 8, !tbaa !5
  %16 = getelementptr inbounds [1000 x i8], ptr %14, i64 0, i64 %15
  %17 = load i8, ptr %16, align 1, !tbaa !9, !range !11, !noundef !12
  %18 = trunc i8 %17 to i1
  br i1 %18, label %19, label %20

19:                                               ; preds = %4
  br label %59

20:                                               ; preds = %4
  %21 = load i64, ptr %5, align 8, !tbaa !5
  %22 = getelementptr inbounds [2 x [1000 x i8]], ptr @vis, i64 0, i64 %21
  %23 = load i64, ptr %6, align 8, !tbaa !5
  %24 = getelementptr inbounds [1000 x i8], ptr %22, i64 0, i64 %23
  store i8 1, ptr %24, align 1, !tbaa !9
  %25 = load i64, ptr %5, align 8, !tbaa !5
  %26 = icmp eq i64 %25, 0
  br i1 %26, label %27, label %33

27:                                               ; preds = %20
  %28 = load i64, ptr %8, align 8, !tbaa !5
  %29 = load i64, ptr %7, align 8, !tbaa !5
  %30 = getelementptr inbounds [1000 x [1000 x i64]], ptr @par, i64 0, i64 %29
  %31 = load i64, ptr %6, align 8, !tbaa !5
  %32 = getelementptr inbounds [1000 x i64], ptr %30, i64 0, i64 %31
  store i64 %28, ptr %32, align 8, !tbaa !5
  br label %33

33:                                               ; preds = %27, %20
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #4
  %34 = load i64, ptr %5, align 8, !tbaa !5
  %35 = getelementptr inbounds [2 x [1000 x %"class.std::vector"]], ptr @graph, i64 0, i64 %34
  %36 = load i64, ptr %6, align 8, !tbaa !5
  %37 = getelementptr inbounds [1000 x %"class.std::vector"], ptr %35, i64 0, i64 %36
  store ptr %37, ptr %9, align 8, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #4
  %38 = load ptr, ptr %9, align 8, !tbaa !13
  %39 = call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %38) #4
  %40 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %10, i32 0, i32 0
  store ptr %39, ptr %40, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %11) #4
  %41 = load ptr, ptr %9, align 8, !tbaa !13
  %42 = call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %41) #4
  %43 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %11, i32 0, i32 0
  store ptr %42, ptr %43, align 8
  br label %44

44:                                               ; preds = %57, %33
  %45 = 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 %45, label %47, label %46

46:                                               ; preds = %44
  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 %59

47:                                               ; preds = %44
  call void @llvm.lifetime.start.p0(i64 8, ptr %12) #4
  %48 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %10) #4
  %49 = load i64, ptr %48, align 8, !tbaa !5
  store i64 %49, ptr %12, align 8, !tbaa !5
  %50 = load i64, ptr %5, align 8, !tbaa !5
  %51 = icmp ne i64 %50, 0
  %52 = xor i1 %51, true
  %53 = zext i1 %52 to i64
  %54 = load i64, ptr %12, align 8, !tbaa !5
  %55 = load i64, ptr %7, align 8, !tbaa !5
  %56 = load i64, ptr %8, align 8, !tbaa !5
  call void @_Z3dfsxxxx(i64 noundef %53, i64 noundef %54, i64 noundef %55, i64 noundef %56)
  call void @llvm.lifetime.end.p0(i64 8, ptr %12) #4
  br label %57

57:                                               ; preds = %47
  %58 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %10) #4
  br label %44

59:                                               ; preds = %46, %19
  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 = !{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 }

@par = external dso_local local_unnamed_addr global [1000 x [1000 x i64]], align 16
@graph = external dso_local global [2 x [1000 x %"class.std::vector"]], align 16
@vis = external dso_local local_unnamed_addr global [2 x [1000 x i8]], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3dfsxxxx(i64 noundef %0, i64 noundef %1, i64 noundef %2, i64 noundef %3) local_unnamed_addr #0 {
  %5 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %6 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %7 = getelementptr inbounds [2 x [1000 x i8]], ptr @vis, i64 0, i64 %0, i64 %1
  %8 = load i8, ptr %7, align 1, !tbaa !5, !range !9, !noundef !10
  %9 = trunc nuw i8 %8 to i1
  br i1 %9, label %25, label %10

10:                                               ; preds = %4
  store i8 1, ptr %7, align 1, !tbaa !5
  %11 = icmp eq i64 %0, 0
  br i1 %11, label %12, label %14

12:                                               ; preds = %10
  %13 = getelementptr inbounds [1000 x [1000 x i64]], ptr @par, i64 0, i64 %2, i64 %1
  store i64 %3, ptr %13, align 8, !tbaa !11
  br label %14

14:                                               ; preds = %12, %10
  %15 = getelementptr inbounds [2 x [1000 x %"class.std::vector"]], ptr @graph, i64 0, i64 %0, i64 %1
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %5) #3
  %16 = tail call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %15) #3
  store ptr %16, ptr %5, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %6) #3
  %17 = tail call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %15) #3
  store ptr %17, ptr %6, align 8
  %18 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPxSt6vectorIxSaIxEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %5, ptr noundef nonnull align 8 dereferenceable(8) %6) #3
  br i1 %18, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %14
  %19 = zext i1 %11 to i64
  br label %20

._crit_edge:                                      ; preds = %20, %14
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %5) #3
  br label %25

20:                                               ; preds = %.lr.ph, %20
  %21 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %5) #3
  %22 = load i64, ptr %21, align 8, !tbaa !11
  call void @_Z3dfsxxxx(i64 noundef %19, i64 noundef %22, i64 noundef %2, i64 noundef %3)
  %23 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %5) #3
  %24 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPxSt6vectorIxSaIxEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %5, ptr noundef nonnull align 8 dereferenceable(8) %6) #3
  br i1 %24, label %20, label %._crit_edge

25:                                               ; preds = %4, %._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 = !{!"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,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass