; LLVM IR from sunkafei/xcpc-algorithm-templates :: 算法/树算法/虚树.ll (Z4dfs1iii)

; 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 }

@dep = external dso_local global [1110000 x i32], align 16
@sz = external dso_local global [1110000 x i32], align 16
@pa = external dso_local global [1110000 x i32], align 16
@son = external dso_local global [1110000 x i32], align 16
@dfn = external dso_local global [1110000 x i32], align 16
@clk = external dso_local global i32, align 4
@G = external dso_local global [1110000 x %"class.std::vector"], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z4dfs1iii(i32 noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %9 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %10 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !5
  %11 = load i32, ptr @clk, align 4, !tbaa !5
  %12 = add nsw i32 %11, 1
  store i32 %12, ptr @clk, align 4, !tbaa !5
  %13 = load i32, ptr %4, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [1110000 x i32], ptr @dfn, i64 0, i64 %14
  store i32 %12, ptr %15, align 4, !tbaa !5
  %16 = load i32, ptr %6, align 4, !tbaa !5
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [1110000 x i32], ptr @dep, i64 0, i64 %18
  store i32 %16, ptr %19, align 4, !tbaa !5
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [1110000 x i32], ptr @sz, i64 0, i64 %21
  store i32 1, ptr %22, align 4, !tbaa !5
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [1110000 x i32], ptr @son, i64 0, i64 %24
  store i32 0, ptr %25, align 4, !tbaa !5
  %26 = load i32, ptr %5, align 4, !tbaa !5
  %27 = load i32, ptr %4, align 4, !tbaa !5
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [1110000 x i32], ptr @pa, i64 0, i64 %28
  store i32 %26, ptr %29, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds [1110000 x %"class.std::vector"], ptr @G, i64 0, i64 %31
  store ptr %32, ptr %7, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %33 = load ptr, ptr %7, align 8, !tbaa !9
  %34 = call ptr @_ZNSt6vectorIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %33) #4
  %35 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %8, i32 0, i32 0
  store ptr %34, ptr %35, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #4
  %36 = load ptr, ptr %7, align 8, !tbaa !9
  %37 = call ptr @_ZNSt6vectorIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %36) #4
  %38 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %9, i32 0, i32 0
  store ptr %37, ptr %38, align 8
  br label %39

39:                                               ; preds = %81, %3
  %40 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %8, ptr noundef nonnull align 8 dereferenceable(8) %9) #4
  br i1 %40, label %42, label %41

41:                                               ; preds = %39
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #4
  br label %83

42:                                               ; preds = %39
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #4
  %43 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %8) #4
  %44 = load i32, ptr %43, align 4, !tbaa !5
  store i32 %44, ptr %10, align 4, !tbaa !5
  %45 = load i32, ptr %10, align 4, !tbaa !5
  %46 = load i32, ptr %5, align 4, !tbaa !5
  %47 = icmp ne i32 %45, %46
  br i1 %47, label %48, label %80

48:                                               ; preds = %42
  %49 = load i32, ptr %10, align 4, !tbaa !5
  %50 = load i32, ptr %4, align 4, !tbaa !5
  %51 = load i32, ptr %6, align 4, !tbaa !5
  %52 = add nsw i32 %51, 1
  call void @_Z4dfs1iii(i32 noundef %49, i32 noundef %50, i32 noundef %52)
  %53 = load i32, ptr %10, align 4, !tbaa !5
  %54 = sext i32 %53 to i64
  %55 = getelementptr inbounds [1110000 x i32], ptr @sz, i64 0, i64 %54
  %56 = load i32, ptr %55, align 4, !tbaa !5
  %57 = load i32, ptr %4, align 4, !tbaa !5
  %58 = sext i32 %57 to i64
  %59 = getelementptr inbounds [1110000 x i32], ptr @sz, i64 0, i64 %58
  %60 = load i32, ptr %59, align 4, !tbaa !5
  %61 = add nsw i32 %60, %56
  store i32 %61, ptr %59, align 4, !tbaa !5
  %62 = load i32, ptr %4, align 4, !tbaa !5
  %63 = sext i32 %62 to i64
  %64 = getelementptr inbounds [1110000 x i32], ptr @son, i64 0, i64 %63
  %65 = load i32, ptr %64, align 4, !tbaa !5
  %66 = sext i32 %65 to i64
  %67 = getelementptr inbounds [1110000 x i32], ptr @sz, i64 0, i64 %66
  %68 = load i32, ptr %67, align 4, !tbaa !5
  %69 = load i32, ptr %10, align 4, !tbaa !5
  %70 = sext i32 %69 to i64
  %71 = getelementptr inbounds [1110000 x i32], ptr @sz, i64 0, i64 %70
  %72 = load i32, ptr %71, align 4, !tbaa !5
  %73 = icmp slt i32 %68, %72
  br i1 %73, label %74, label %79

74:                                               ; preds = %48
  %75 = load i32, ptr %10, align 4, !tbaa !5
  %76 = load i32, ptr %4, align 4, !tbaa !5
  %77 = sext i32 %76 to i64
  %78 = getelementptr inbounds [1110000 x i32], ptr @son, i64 0, i64 %77
  store i32 %75, ptr %78, align 4, !tbaa !5
  br label %79

79:                                               ; preds = %74, %48
  br label %80

80:                                               ; preds = %79, %42
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #4
  br label %81

81:                                               ; preds = %80
  %82 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %8) #4
  br label %39

83:                                               ; preds = %41
  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 @_ZNSt6vectorIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 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)) #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_iteratorIPiSt6vectorIiSaIiEEEppEv(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 = !{!"int", !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<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 }

@dep = external dso_local local_unnamed_addr global [1110000 x i32], align 16
@sz = external dso_local local_unnamed_addr global [1110000 x i32], align 16
@pa = external dso_local local_unnamed_addr global [1110000 x i32], align 16
@son = external dso_local local_unnamed_addr global [1110000 x i32], align 16
@dfn = external dso_local local_unnamed_addr global [1110000 x i32], align 16
@clk = external dso_local local_unnamed_addr global i32, align 4
@G = external dso_local global [1110000 x %"class.std::vector"], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z4dfs1iii(i32 noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %5 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %6 = load i32, ptr @clk, align 4, !tbaa !5
  %7 = add nsw i32 %6, 1
  store i32 %7, ptr @clk, align 4, !tbaa !5
  %8 = sext i32 %0 to i64
  %9 = getelementptr inbounds [1110000 x i32], ptr @dfn, i64 0, i64 %8
  store i32 %7, ptr %9, align 4, !tbaa !5
  %10 = getelementptr inbounds [1110000 x i32], ptr @dep, i64 0, i64 %8
  store i32 %2, ptr %10, align 4, !tbaa !5
  %11 = getelementptr inbounds [1110000 x i32], ptr @sz, i64 0, i64 %8
  store i32 1, ptr %11, align 4, !tbaa !5
  %12 = getelementptr inbounds [1110000 x i32], ptr @son, i64 0, i64 %8
  store i32 0, ptr %12, align 4, !tbaa !5
  %13 = getelementptr inbounds [1110000 x i32], ptr @pa, i64 0, i64 %8
  store i32 %1, ptr %13, align 4, !tbaa !5
  %14 = getelementptr inbounds [1110000 x %"class.std::vector"], ptr @G, i64 0, i64 %8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  %15 = tail call ptr @_ZNSt6vectorIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %14) #3
  store ptr %15, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %5) #3
  %16 = tail call ptr @_ZNSt6vectorIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %14) #3
  store ptr %16, ptr %5, align 8
  %17 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %4, ptr noundef nonnull align 8 dereferenceable(8) %5) #3
  br i1 %17, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3
  %18 = add nsw i32 %2, 1
  br label %19

._crit_edge:                                      ; preds = %35, %3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #3
  ret void

19:                                               ; preds = %.lr.ph, %35
  %20 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %4) #3
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %.not = icmp eq i32 %21, %1
  br i1 %.not, label %35, label %22

22:                                               ; preds = %19
  call void @_Z4dfs1iii(i32 noundef %21, i32 noundef %0, i32 noundef %18)
  %23 = sext i32 %21 to i64
  %24 = getelementptr inbounds [1110000 x i32], ptr @sz, i64 0, i64 %23
  %25 = load i32, ptr %24, align 4, !tbaa !5
  %26 = load i32, ptr %11, align 4, !tbaa !5
  %27 = add nsw i32 %26, %25
  store i32 %27, ptr %11, align 4, !tbaa !5
  %28 = load i32, ptr %12, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [1110000 x i32], ptr @sz, i64 0, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !5
  %32 = load i32, ptr %24, align 4, !tbaa !5
  %33 = icmp slt i32 %31, %32
  br i1 %33, label %34, label %35

34:                                               ; preds = %22
  store i32 %21, ptr %12, align 4, !tbaa !5
  br label %35

35:                                               ; preds = %22, %34, %19
  %36 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %4) #3
  %37 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPiSt6vectorIiSaIiEEEEbRKNS_17__normal_iteratorIT_T0_EESA_(ptr noundef nonnull align 8 dereferenceable(8) %4, ptr noundef nonnull align 8 dereferenceable(8) %5) #3
  br i1 %37, label %19, label %._crit_edge
}

; 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 @_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 #2

; 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 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_iteratorIPiSt6vectorIiSaIiEEEppEv(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 = !{!"int", !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