; LLVM IR from eyangch/competitive-programming :: Codeforces/1704/e.ll (Z5dfs_ixx)

; 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 }

@A = external dso_local global [1000 x i64], align 16
@mxi = external dso_local global [1000 x i64], align 16
@R = external dso_local global [1000 x %"class.std::vector"], align 16
@vis = external dso_local global [1000 x [1000 x i8]], align 16
@mxd = external dso_local global i64, align 8

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5dfs_ixx(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 [1000 x [1000 x i8]], ptr @vis, i64 0, i64 %9
  %11 = load i64, ptr %4, align 8, !tbaa !5
  %12 = getelementptr inbounds [1000 x i8], ptr %10, i64 0, i64 %11
  %13 = load i8, ptr %12, align 1, !tbaa !9, !range !11, !noundef !12
  %14 = trunc i8 %13 to i1
  br i1 %14, label %15, label %16

15:                                               ; preds = %2
  br label %50

16:                                               ; preds = %2
  %17 = load i64, ptr %3, align 8, !tbaa !5
  %18 = getelementptr inbounds [1000 x [1000 x i8]], ptr @vis, i64 0, i64 %17
  %19 = load i64, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds [1000 x i8], ptr %18, i64 0, i64 %19
  store i8 1, ptr %20, align 1, !tbaa !9
  %21 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) @mxd, ptr noundef nonnull align 8 dereferenceable(8) %4)
  %22 = load i64, ptr %21, align 8, !tbaa !5
  store i64 %22, ptr @mxd, align 8, !tbaa !5
  %23 = load i64, ptr %4, align 8, !tbaa !5
  %24 = getelementptr inbounds [1000 x i64], ptr @mxi, i64 0, i64 %23
  %25 = load i64, ptr %3, align 8, !tbaa !5
  %26 = getelementptr inbounds [1000 x i64], ptr @A, i64 0, i64 %25
  %27 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %24, ptr noundef nonnull align 8 dereferenceable(8) %26)
  %28 = load i64, ptr %27, align 8, !tbaa !5
  %29 = load i64, ptr %4, align 8, !tbaa !5
  %30 = getelementptr inbounds [1000 x i64], ptr @mxi, i64 0, i64 %29
  store i64 %28, ptr %30, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %31 = load i64, ptr %3, align 8, !tbaa !5
  %32 = getelementptr inbounds [1000 x %"class.std::vector"], ptr @R, i64 0, i64 %31
  store ptr %32, ptr %5, align 8, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  %33 = load ptr, ptr %5, align 8, !tbaa !13
  %34 = call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %33) #4
  %35 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %6, i32 0, i32 0
  store ptr %34, ptr %35, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %36 = load ptr, ptr %5, align 8, !tbaa !13
  %37 = call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %36) #4
  %38 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %7, i32 0, i32 0
  store ptr %37, ptr %38, align 8
  br label %39

39:                                               ; preds = %48, %16
  %40 = 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 %40, label %42, label %41

41:                                               ; preds = %39
  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 %50

42:                                               ; preds = %39
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %43 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #4
  %44 = load i64, ptr %43, align 8, !tbaa !5
  store i64 %44, ptr %8, align 8, !tbaa !5
  %45 = load i64, ptr %8, align 8, !tbaa !5
  %46 = load i64, ptr %4, align 8, !tbaa !5
  %47 = add nsw i64 %46, 1
  call void @_Z5dfs_ixx(i64 noundef %45, i64 noundef %47)
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  br label %48

48:                                               ; preds = %42
  %49 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #4
  br label %39

50:                                               ; preds = %41, %15
  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 = !{!"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 }

@A = external dso_local global [1000 x i64], align 16
@mxi = external dso_local global [1000 x i64], align 16
@R = external dso_local global [1000 x %"class.std::vector"], align 16
@vis = external dso_local local_unnamed_addr global [1000 x [1000 x i8]], align 16
@mxd = external dso_local global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z5dfs_ixx(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
  store i64 %1, ptr %3, align 8, !tbaa !5
  %6 = getelementptr inbounds [1000 x [1000 x i8]], ptr @vis, i64 0, i64 %0, i64 %1
  %7 = load i8, ptr %6, align 1, !tbaa !9, !range !11, !noundef !12
  %8 = trunc nuw i8 %7 to i1
  br i1 %8, label %29, label %9

9:                                                ; preds = %2
  store i8 1, ptr %6, align 1, !tbaa !9
  %10 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) @mxd, ptr noundef nonnull align 8 dereferenceable(8) %3)
  %11 = load i64, ptr %10, align 8, !tbaa !5
  store i64 %11, ptr @mxd, align 8, !tbaa !5
  %12 = load i64, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds [1000 x i64], ptr @mxi, i64 0, i64 %12
  %14 = getelementptr inbounds [1000 x i64], ptr @A, i64 0, i64 %0
  %15 = 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) %14)
  %16 = load i64, ptr %15, align 8, !tbaa !5
  %17 = load i64, ptr %3, align 8, !tbaa !5
  %18 = getelementptr inbounds [1000 x i64], ptr @mxi, i64 0, i64 %17
  store i64 %16, ptr %18, align 8, !tbaa !5
  %19 = getelementptr inbounds [1000 x %"class.std::vector"], ptr @R, i64 0, i64 %0
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  %20 = call ptr @_ZNSt6vectorIxSaIxEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %19) #3
  store ptr %20, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %5) #3
  %21 = call ptr @_ZNSt6vectorIxSaIxEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %19) #3
  store ptr %21, ptr %5, align 8
  %22 = 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 %22, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %9
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #3
  br label %29

.lr.ph:                                           ; preds = %9, %.lr.ph
  %23 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPxSt6vectorIxSaIxEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %4) #3
  %24 = load i64, ptr %23, align 8, !tbaa !5
  %25 = load i64, ptr %3, align 8, !tbaa !5
  %26 = add nsw i64 %25, 1
  call void @_Z5dfs_ixx(i64 noundef %24, 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

29:                                               ; preds = %2, %._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"}
!9 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}


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