; LLVM IR from Tunghohin/Competitive_Coding :: Nowcoder/28260_C.ll (Z5dfs_2ii)

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

@dp = external dso_local global [1000010 x i64], align 16
@res = external dso_local global [1000010 x i64], align 16
@G = external dso_local global [1000010 x %"class.std::vector"], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z5q_powiii(i32 noundef, i32 noundef, i32 noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5dfs_1ii(i32 noundef, i32 noundef) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) #0 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZN9__gnu_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_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 4 dereferenceable(4) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEppEv(ptr noundef nonnull align 8 dereferenceable(8)) #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5dfs_2ii(i32 noundef %0, i32 noundef %1) #2 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %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 i32, align 4
  %9 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [1000010 x i64], ptr @dp, i64 0, i64 %11
  %13 = load i64, ptr %12, align 8, !tbaa !9
  %14 = add nsw i64 %13, 1
  %15 = srem i64 %14, 1000000007
  %16 = icmp eq i64 %15, 0
  br i1 %16, label %17, label %27

17:                                               ; preds = %2
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = load i32, ptr %3, align 4, !tbaa !5
  call void @_Z5dfs_1ii(i32 noundef %18, i32 noundef %19)
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [1000010 x i64], ptr @dp, i64 0, i64 %21
  %23 = load i64, ptr %22, align 8, !tbaa !9
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds [1000010 x i64], ptr @res, i64 0, i64 %25
  store i64 %23, ptr %26, align 8, !tbaa !9
  br label %52

27:                                               ; preds = %2
  %28 = load i32, ptr %4, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [1000010 x i64], ptr @res, i64 0, i64 %29
  %31 = load i64, ptr %30, align 8, !tbaa !9
  %32 = load i32, ptr %3, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds [1000010 x i64], ptr @dp, i64 0, i64 %33
  %35 = load i64, ptr %34, align 8, !tbaa !9
  %36 = add nsw i64 %35, 1
  %37 = trunc i64 %36 to i32
  %38 = call noundef i32 @_Z5q_powiii(i32 noundef %37, i32 noundef 1000000005, i32 noundef 1000000007)
  %39 = sext i32 %38 to i64
  %40 = mul nsw i64 %31, %39
  %41 = add nsw i64 1, %40
  %42 = srem i64 %41, 1000000007
  %43 = load i32, ptr %3, align 4, !tbaa !5
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds [1000010 x i64], ptr @dp, i64 0, i64 %44
  %46 = load i64, ptr %45, align 8, !tbaa !9
  %47 = mul nsw i64 %42, %46
  %48 = srem i64 %47, 1000000007
  %49 = load i32, ptr %3, align 4, !tbaa !5
  %50 = sext i32 %49 to i64
  %51 = getelementptr inbounds [1000010 x i64], ptr @res, i64 0, i64 %50
  store i64 %48, ptr %51, align 8, !tbaa !9
  br label %52

52:                                               ; preds = %27, %17
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %53 = load i32, ptr %3, align 4, !tbaa !5
  %54 = sext i32 %53 to i64
  %55 = getelementptr inbounds [1000010 x %"class.std::vector"], ptr @G, i64 0, i64 %54
  store ptr %55, ptr %5, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  %56 = load ptr, ptr %5, align 8, !tbaa !11
  %57 = call ptr @_ZNSt6vectorIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %56) #4
  %58 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %6, i32 0, i32 0
  store ptr %57, ptr %58, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %59 = load ptr, ptr %5, align 8, !tbaa !11
  %60 = call ptr @_ZNSt6vectorIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %59) #4
  %61 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %7, i32 0, i32 0
  store ptr %60, ptr %61, align 8
  br label %62

62:                                               ; preds = %78, %52
  %63 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %6, ptr noundef nonnull align 8 dereferenceable(8) %7) #4
  br i1 %63, label %65, label %64

64:                                               ; preds = %62
  store i32 2, ptr %8, align 4
  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 %80

65:                                               ; preds = %62
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #4
  %66 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #4
  %67 = load i32, ptr %66, align 4, !tbaa !5
  store i32 %67, ptr %9, align 4, !tbaa !5
  %68 = load i32, ptr %9, align 4, !tbaa !5
  %69 = load i32, ptr %4, align 4, !tbaa !5
  %70 = icmp eq i32 %68, %69
  br i1 %70, label %71, label %72

71:                                               ; preds = %65
  store i32 3, ptr %8, align 4
  br label %75

72:                                               ; preds = %65
  %73 = load i32, ptr %9, align 4, !tbaa !5
  %74 = load i32, ptr %3, align 4, !tbaa !5
  call void @_Z5dfs_2ii(i32 noundef %73, i32 noundef %74)
  store i32 0, ptr %8, align 4
  br label %75

75:                                               ; preds = %72, %71
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #4
  %76 = load i32, ptr %8, align 4
  switch i32 %76, label %81 [
    i32 0, label %77
    i32 3, label %78
  ]

77:                                               ; preds = %75
  br label %78

78:                                               ; preds = %77, %75
  %79 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #4
  br label %62

80:                                               ; preds = %64
  ret void

81:                                               ; preds = %75
  unreachable
}

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"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<int, std::allocator<int>>::_Vector_impl" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.__gnu_cxx::__normal_iterator" = type { ptr }

@dp = external dso_local local_unnamed_addr global [1000010 x i64], align 16
@res = external dso_local local_unnamed_addr global [1000010 x i64], align 16
@G = external dso_local global [1000010 x %"class.std::vector"], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z5q_powiii(i32 noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; 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 nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5dfs_1ii(i32 noundef, i32 noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIiSaIiEE3endEv(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_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #3

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEppEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5dfs_2ii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #2 {
  %3 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %4 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %5 = sext i32 %0 to i64
  %6 = getelementptr inbounds [1000010 x i64], ptr @dp, i64 0, i64 %5
  %7 = load i64, ptr %6, align 8, !tbaa !5
  %8 = add nsw i64 %7, 1
  %9 = srem i64 %8, 1000000007
  %10 = icmp eq i64 %9, 0
  br i1 %10, label %11, label %13

11:                                               ; preds = %2
  tail call void @_Z5dfs_1ii(i32 noundef %0, i32 noundef %0)
  %12 = load i64, ptr %6, align 8, !tbaa !5
  br label %26

13:                                               ; preds = %2
  %14 = sext i32 %1 to i64
  %15 = getelementptr inbounds [1000010 x i64], ptr @res, i64 0, i64 %14
  %16 = load i64, ptr %15, align 8, !tbaa !5
  %17 = trunc i64 %8 to i32
  %18 = tail call noundef i32 @_Z5q_powiii(i32 noundef %17, i32 noundef 1000000005, i32 noundef 1000000007)
  %19 = sext i32 %18 to i64
  %20 = mul nsw i64 %16, %19
  %21 = add nsw i64 %20, 1
  %22 = srem i64 %21, 1000000007
  %23 = load i64, ptr %6, align 8, !tbaa !5
  %24 = mul nsw i64 %22, %23
  %25 = srem i64 %24, 1000000007
  br label %26

26:                                               ; preds = %13, %11
  %.sink = phi i64 [ %12, %11 ], [ %25, %13 ]
  %27 = getelementptr inbounds [1000010 x i64], ptr @res, i64 0, i64 %5
  store i64 %.sink, ptr %27, align 8
  %28 = getelementptr inbounds [1000010 x %"class.std::vector"], ptr @G, i64 0, i64 %5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #4
  %29 = tail call ptr @_ZNSt6vectorIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %28) #4
  store ptr %29, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #4
  %30 = tail call ptr @_ZNSt6vectorIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %28) #4
  store ptr %30, ptr %4, align 8
  %31 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %3, ptr noundef nonnull align 8 dereferenceable(8) %4) #4
  br i1 %31, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %36, %26
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #4
  ret void

.lr.ph:                                           ; preds = %26, %36
  %32 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #4
  %33 = load i32, ptr %32, align 4, !tbaa !9
  %34 = icmp eq i32 %33, %1
  br i1 %34, label %36, label %35

35:                                               ; preds = %.lr.ph
  call void @_Z5dfs_2ii(i32 noundef %33, i32 noundef %0)
  br label %36

36:                                               ; preds = %.lr.ph, %35
  %37 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %3) #4
  %38 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %3, ptr noundef nonnull align 8 dereferenceable(8) %4) #4
  br i1 %38, label %.lr.ph, label %._crit_edge
}

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 = { 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 #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 = !{!"int", !7, i64 0}


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