; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/graphs (TopologicalSort)

; 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"

%"struct.std::_Bit_reference" = type { ptr, i64 }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9dfs_visitRSt6vectorIS_IiSaIiEESaIS1_EEiRSt5stackIiSt5dequeIiS0_EERS_IbSaIbEE(ptr noundef nonnull align 8 dereferenceable(24) %0, i32 noundef %1, ptr noundef nonnull align 8 dereferenceable(80) %2, ptr noundef nonnull align 8 dereferenceable(40) %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca %"struct.std::_Bit_reference", align 8
  %10 = alloca i32, align 4
  %11 = alloca %"struct.std::_Bit_reference", align 8
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store ptr %2, ptr %7, align 8, !tbaa !5
  store ptr %3, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 16, ptr %9) #3
  %12 = load ptr, ptr %8, align 8, !tbaa !5
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = sext i32 %13 to i64
  %15 = call { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40) %12, i64 noundef %14)
  %16 = getelementptr inbounds { ptr, i64 }, ptr %9, i32 0, i32 0
  %17 = extractvalue { ptr, i64 } %15, 0
  store ptr %17, ptr %16, align 8
  %18 = getelementptr inbounds { ptr, i64 }, ptr %9, i32 0, i32 1
  %19 = extractvalue { ptr, i64 } %15, 1
  store i64 %19, ptr %18, align 8
  %20 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt14_Bit_referenceaSEb(ptr noundef nonnull align 8 dereferenceable(16) %9, i1 noundef zeroext true) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr %9) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  store i32 0, ptr %10, align 4, !tbaa !9
  br label %21

21:                                               ; preds = %63, %4
  %22 = load i32, ptr %10, align 4, !tbaa !9
  %23 = sext i32 %22 to i64
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = load i32, ptr %6, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IiSaIiEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %24, i64 noundef %26) #3
  %28 = call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %27) #3
  %29 = icmp ult i64 %23, %28
  br i1 %29, label %31, label %30

30:                                               ; preds = %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  br label %66

31:                                               ; preds = %21
  call void @llvm.lifetime.start.p0(i64 16, ptr %11) #3
  %32 = load ptr, ptr %8, align 8, !tbaa !5
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = load i32, ptr %6, align 4, !tbaa !9
  %35 = sext i32 %34 to i64
  %36 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IiSaIiEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %33, i64 noundef %35) #3
  %37 = load i32, ptr %10, align 4, !tbaa !9
  %38 = sext i32 %37 to i64
  %39 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %36, i64 noundef %38) #3
  %40 = load i32, ptr %39, align 4, !tbaa !9
  %41 = sext i32 %40 to i64
  %42 = call { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40) %32, i64 noundef %41)
  %43 = getelementptr inbounds { ptr, i64 }, ptr %11, i32 0, i32 0
  %44 = extractvalue { ptr, i64 } %42, 0
  store ptr %44, ptr %43, align 8
  %45 = getelementptr inbounds { ptr, i64 }, ptr %11, i32 0, i32 1
  %46 = extractvalue { ptr, i64 } %42, 1
  store i64 %46, ptr %45, align 8
  %47 = call noundef zeroext i1 @_ZNKSt14_Bit_referencecvbEv(ptr noundef nonnull align 8 dereferenceable(16) %11) #3
  %48 = zext i1 %47 to i32
  %49 = icmp eq i32 %48, 0
  call void @llvm.lifetime.end.p0(i64 16, ptr %11) #3
  br i1 %49, label %50, label %62

50:                                               ; preds = %31
  %51 = load ptr, ptr %5, align 8, !tbaa !5
  %52 = load ptr, ptr %5, align 8, !tbaa !5
  %53 = load i32, ptr %6, align 4, !tbaa !9
  %54 = sext i32 %53 to i64
  %55 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IiSaIiEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %52, i64 noundef %54) #3
  %56 = load i32, ptr %10, align 4, !tbaa !9
  %57 = sext i32 %56 to i64
  %58 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %55, i64 noundef %57) #3
  %59 = load i32, ptr %58, align 4, !tbaa !9
  %60 = load ptr, ptr %7, align 8, !tbaa !5
  %61 = load ptr, ptr %8, align 8, !tbaa !5
  call void @_Z9dfs_visitRSt6vectorIS_IiSaIiEESaIS1_EEiRSt5stackIiSt5dequeIiS0_EERS_IbSaIbEE(ptr noundef nonnull align 8 dereferenceable(24) %51, i32 noundef %59, ptr noundef nonnull align 8 dereferenceable(80) %60, ptr noundef nonnull align 8 dereferenceable(40) %61)
  br label %62

62:                                               ; preds = %50, %31
  br label %63

63:                                               ; preds = %62
  %64 = load i32, ptr %10, align 4, !tbaa !9
  %65 = add nsw i32 %64, 1
  store i32 %65, ptr %10, align 4, !tbaa !9
  br label %21, !llvm.loop !11

66:                                               ; preds = %30
  %67 = load ptr, ptr %7, align 8, !tbaa !5
  call void @_ZNSt5stackIiSt5dequeIiSaIiEEE4pushERKi(ptr noundef nonnull align 8 dereferenceable(80) %67, ptr noundef nonnull align 4 dereferenceable(4) %6)
  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 uwtable
declare dso_local { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40), i64 noundef) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt14_Bit_referenceaSEb(ptr noundef nonnull align 8 dereferenceable(16), i1 noundef zeroext) #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(24) ptr @_ZNSt6vectorIS_IiSaIiEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt14_Bit_referencecvbEv(ptr noundef nonnull align 8 dereferenceable(16)) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5stackIiSt5dequeIiSaIiEEE4pushERKi(ptr noundef nonnull align 8 dereferenceable(80), ptr noundef nonnull align 4 dereferenceable(4)) #0 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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; 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"

%"struct.std::_Bit_reference" = type { ptr, i64 }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9dfs_visitRSt6vectorIS_IiSaIiEESaIS1_EEiRSt5stackIiSt5dequeIiS0_EERS_IbSaIbEE(ptr noundef nonnull align 8 dereferenceable(24) %0, i32 noundef %1, ptr noundef nonnull align 8 dereferenceable(80) %2, ptr noundef nonnull align 8 dereferenceable(40) %3) local_unnamed_addr #0 {
  %5 = alloca i32, align 4
  %6 = alloca %"struct.std::_Bit_reference", align 8
  %7 = alloca %"struct.std::_Bit_reference", align 8
  store i32 %1, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %6) #3
  %8 = sext i32 %1 to i64
  %9 = tail call { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40) %3, i64 noundef %8)
  %10 = extractvalue { ptr, i64 } %9, 0
  store ptr %10, ptr %6, align 8
  %11 = getelementptr inbounds i8, ptr %6, i64 8
  %12 = extractvalue { ptr, i64 } %9, 1
  store i64 %12, ptr %11, align 8
  %13 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt14_Bit_referenceaSEb(ptr noundef nonnull align 8 dereferenceable(16) %6, i1 noundef zeroext true) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %6) #3
  %14 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IiSaIiEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %8) #3
  %15 = call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %14) #3
  %.not = icmp eq i64 %15, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %4
  %16 = getelementptr inbounds i8, ptr %7, i64 8
  br label %17

._crit_edge:                                      ; preds = %30, %4
  call void @_ZNSt5stackIiSt5dequeIiSaIiEEE4pushERKi(ptr noundef nonnull align 8 dereferenceable(80) %2, ptr noundef nonnull align 4 dereferenceable(4) %5)
  ret void

17:                                               ; preds = %.lr.ph, %30
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %30 ]
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %7) #3
  %18 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IiSaIiEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %8) #3
  %19 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %18, i64 noundef %indvars.iv) #3
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = call { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40) %3, i64 noundef %21)
  %23 = extractvalue { ptr, i64 } %22, 0
  store ptr %23, ptr %7, align 8
  %24 = extractvalue { ptr, i64 } %22, 1
  store i64 %24, ptr %16, align 8
  %25 = call noundef zeroext i1 @_ZNKSt14_Bit_referencecvbEv(ptr noundef nonnull align 8 dereferenceable(16) %7) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %7) #3
  br i1 %25, label %30, label %26

26:                                               ; preds = %17
  %27 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IiSaIiEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %8) #3
  %28 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %27, i64 noundef %indvars.iv) #3
  %29 = load i32, ptr %28, align 4, !tbaa !5
  call void @_Z9dfs_visitRSt6vectorIS_IiSaIiEESaIS1_EEiRSt5stackIiSt5dequeIiS0_EERS_IbSaIbEE(ptr noundef nonnull align 8 dereferenceable(24) %0, i32 noundef %29, ptr noundef nonnull align 8 dereferenceable(80) %2, ptr noundef nonnull align 8 dereferenceable(40) %3)
  br label %30

30:                                               ; preds = %17, %26
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %31 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNSt6vectorIS_IiSaIiEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %8) #3
  %32 = call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %31) #3
  %33 = icmp ugt i64 %32, %indvars.iv.next
  br i1 %33, label %17, label %._crit_edge, !llvm.loop !9
}

; 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 uwtable
declare dso_local { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt14_Bit_referenceaSEb(ptr noundef nonnull align 8 dereferenceable(16), i1 noundef zeroext) local_unnamed_addr #2 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(24) ptr @_ZNSt6vectorIS_IiSaIiEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt14_Bit_referencecvbEv(ptr noundef nonnull align 8 dereferenceable(16)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5stackIiSt5dequeIiSaIiEEE4pushERKi(ptr noundef nonnull align 8 dereferenceable(80), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0 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 = { mustprogress 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 = { 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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