; LLVM IR from AdarshGaur/Competitive-Programming :: Atcoder/AtCoder Beginner Contest 233/c2.ll (Z3dfsll)

; 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::vector<long>, std::allocator<std::vector<long>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::vector<long>, std::allocator<std::vector<long>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::vector<long>, std::allocator<std::vector<long>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::vector<long>, std::allocator<std::vector<long>>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.__gnu_cxx::__normal_iterator" = type { ptr }

@L = external dso_local global %"class.std::vector", align 8
@ans = external dso_local global i64, align 8
@n = external dso_local global i64, align 8
@x = external dso_local global i64, align 8

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsll(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 = load i64, ptr @n, align 8, !tbaa !5
  %11 = icmp eq i64 %9, %10
  br i1 %11, label %12, label %20

12:                                               ; preds = %2
  %13 = load i64, ptr %4, align 8, !tbaa !5
  %14 = load i64, ptr @x, align 8, !tbaa !5
  %15 = icmp eq i64 %13, %14
  br i1 %15, label %16, label %19

16:                                               ; preds = %12
  %17 = load i64, ptr @ans, align 8, !tbaa !5
  %18 = add nsw i64 %17, 1
  store i64 %18, ptr @ans, align 8, !tbaa !5
  br label %19

19:                                               ; preds = %16, %12
  br label %50

20:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %21 = load i64, ptr %3, align 8, !tbaa !5
  %22 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IlSaIlEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) @L, i64 noundef %21) #4
  store ptr %22, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  %23 = load ptr, ptr %5, align 8, !tbaa !9
  %24 = call ptr @_ZNSt6vectorIlSaIlEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %23) #4
  %25 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %6, i32 0, i32 0
  store ptr %24, ptr %25, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %26 = load ptr, ptr %5, align 8, !tbaa !9
  %27 = call ptr @_ZNSt6vectorIlSaIlEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %26) #4
  %28 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %7, i32 0, i32 0
  store ptr %27, ptr %28, align 8
  br label %29

29:                                               ; preds = %47, %20
  %30 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPlSt6vectorIlSaIlEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %6, ptr noundef nonnull align 8 dereferenceable(8) %7) #4
  br i1 %30, label %32, label %31

31:                                               ; preds = %29
  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 %49

32:                                               ; preds = %29
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %33 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPlSt6vectorIlSaIlEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #4
  %34 = load i64, ptr %33, align 8, !tbaa !5
  store i64 %34, ptr %8, align 8, !tbaa !5
  %35 = load i64, ptr %4, align 8, !tbaa !5
  %36 = load i64, ptr @x, align 8, !tbaa !5
  %37 = load i64, ptr %8, align 8, !tbaa !5
  %38 = sdiv i64 %36, %37
  %39 = icmp sle i64 %35, %38
  br i1 %39, label %40, label %46

40:                                               ; preds = %32
  %41 = load i64, ptr %3, align 8, !tbaa !5
  %42 = add nsw i64 %41, 1
  %43 = load i64, ptr %4, align 8, !tbaa !5
  %44 = load i64, ptr %8, align 8, !tbaa !5
  %45 = mul nsw i64 %43, %44
  call void @_Z3dfsll(i64 noundef %42, i64 noundef %45)
  br label %46

46:                                               ; preds = %40, %32
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  br label %47

47:                                               ; preds = %46
  %48 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPlSt6vectorIlSaIlEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #4
  br label %29

49:                                               ; preds = %31
  br label %50

50:                                               ; preds = %49, %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 noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IlSaIlEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIlSaIlEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIlSaIlEE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZN9__gnu_cxxneIPlSt6vectorIlSaIlEEEEbRKNS_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_iteratorIPlSt6vectorIlSaIlEEEdeEv(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_iteratorIPlSt6vectorIlSaIlEEEppEv(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", !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<std::vector<long>, std::allocator<std::vector<long>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::vector<long>, std::allocator<std::vector<long>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::vector<long>, std::allocator<std::vector<long>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::vector<long>, std::allocator<std::vector<long>>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.__gnu_cxx::__normal_iterator" = type { ptr }

@L = external dso_local global %"class.std::vector", align 8
@ans = external dso_local local_unnamed_addr global i64, align 8
@n = external dso_local local_unnamed_addr global i64, align 8
@x = external dso_local local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3dfsll(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %4 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %5 = load i64, ptr @n, align 8, !tbaa !5
  %6 = icmp eq i64 %5, %0
  br i1 %6, label %7, label %13

7:                                                ; preds = %2
  %8 = load i64, ptr @x, align 8, !tbaa !5
  %9 = icmp eq i64 %8, %1
  br i1 %9, label %10, label %29

10:                                               ; preds = %7
  %11 = load i64, ptr @ans, align 8, !tbaa !5
  %12 = add nsw i64 %11, 1
  store i64 %12, ptr @ans, align 8, !tbaa !5
  br label %29

13:                                               ; preds = %2
  %14 = tail call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IlSaIlEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) @L, i64 noundef %0) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  %15 = tail call ptr @_ZNSt6vectorIlSaIlEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %14) #3
  store ptr %15, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  %16 = tail call ptr @_ZNSt6vectorIlSaIlEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %14) #3
  store ptr %16, ptr %4, align 8
  %17 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPlSt6vectorIlSaIlEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %3, ptr noundef nonnull align 8 dereferenceable(8) %4) #3
  br i1 %17, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %13
  %18 = add nsw i64 %0, 1
  br label %19

._crit_edge:                                      ; preds = %26, %13
  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

19:                                               ; preds = %.lr.ph, %26
  %20 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPlSt6vectorIlSaIlEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #3
  %21 = load i64, ptr %20, align 8, !tbaa !5
  %22 = load i64, ptr @x, align 8, !tbaa !5
  %23 = sdiv i64 %22, %21
  %.not = icmp slt i64 %23, %1
  br i1 %.not, label %26, label %24

24:                                               ; preds = %19
  %25 = mul nsw i64 %21, %1
  call void @_Z3dfsll(i64 noundef %18, i64 noundef %25)
  br label %26

26:                                               ; preds = %24, %19
  %27 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPlSt6vectorIlSaIlEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #3
  %28 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPlSt6vectorIlSaIlEEEEbRKNS_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 %19, label %._crit_edge

29:                                               ; preds = %7, %10, %._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 noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IlSaIlEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIlSaIlEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIlSaIlEE3endEv(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_cxxneIPlSt6vectorIlSaIlEEEEbRKNS_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_iteratorIPlSt6vectorIlSaIlEEEdeEv(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_iteratorIPlSt6vectorIlSaIlEEEppEv(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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


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