; LLVM IR from UtkarshPathrabe/Competitive-Coding :: Model Algorithms/Graphs (Topological Sorting)

; 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::_List_iterator" = type { ptr }
%class.Graph = type { i32, ptr }
%"class.std::__cxx11::list" = type { %"class.std::__cxx11::_List_base" }
%"class.std::__cxx11::_List_base" = type { %"struct.std::__cxx11::_List_base<int, std::allocator<int>>::_List_impl" }
%"struct.std::__cxx11::_List_base<int, std::allocator<int>>::_List_impl" = type { %"struct.std::__detail::_List_node_header" }
%"struct.std::__detail::_List_node_header" = type { %"struct.std::__detail::_List_node_base", i64 }
%"struct.std::__detail::_List_node_base" = type { ptr, ptr }

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN5Graph19topologicalSortUtilEiPbRSt5stackIiSt5dequeIiSaIiEEE(ptr noundef nonnull align 8 dereferenceable(16) %0, i32 noundef %1, ptr noundef %2, ptr noundef nonnull align 8 dereferenceable(80) %3) #0 align 2 {
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca %"struct.std::_List_iterator", align 8
  %10 = alloca %"struct.std::_List_iterator", align 8
  %11 = alloca %"struct.std::_List_iterator", align 8
  %12 = alloca %"struct.std::_List_iterator", 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
  %13 = load ptr, ptr %5, align 8
  %14 = load ptr, ptr %7, align 8, !tbaa !5
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds i8, ptr %14, i64 %16
  store i8 1, ptr %17, align 1, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #4
  call void @_ZNSt14_List_iteratorIiEC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %9) #4
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #4
  %18 = getelementptr inbounds %class.Graph, ptr %13, i32 0, i32 1
  %19 = load ptr, ptr %18, align 8, !tbaa !13
  %20 = load i32, ptr %6, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds %"class.std::__cxx11::list", ptr %19, i64 %21
  %23 = call ptr @_ZNSt7__cxx114listIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %22) #4
  %24 = getelementptr inbounds %"struct.std::_List_iterator", ptr %10, i32 0, i32 0
  store ptr %23, ptr %24, align 8
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %9, ptr align 8 %10, i64 8, i1 false), !tbaa.struct !15
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #4
  br label %25

25:                                               ; preds = %48, %4
  call void @llvm.lifetime.start.p0(i64 8, ptr %11) #4
  %26 = getelementptr inbounds %class.Graph, ptr %13, i32 0, i32 1
  %27 = load ptr, ptr %26, align 8, !tbaa !13
  %28 = load i32, ptr %6, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds %"class.std::__cxx11::list", ptr %27, i64 %29
  %31 = call ptr @_ZNSt7__cxx114listIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %30) #4
  %32 = getelementptr inbounds %"struct.std::_List_iterator", ptr %11, i32 0, i32 0
  store ptr %31, ptr %32, align 8
  %33 = call noundef zeroext i1 @_ZStneRKSt14_List_iteratorIiES2_(ptr noundef nonnull align 8 dereferenceable(8) %9, ptr noundef nonnull align 8 dereferenceable(8) %11) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %11) #4
  br i1 %33, label %34, label %51

34:                                               ; preds = %25
  %35 = load ptr, ptr %7, align 8, !tbaa !5
  %36 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %9) #4
  %37 = load i32, ptr %36, align 4, !tbaa !9
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds i8, ptr %35, i64 %38
  %40 = load i8, ptr %39, align 1, !tbaa !11, !range !16, !noundef !17
  %41 = trunc i8 %40 to i1
  br i1 %41, label %47, label %42

42:                                               ; preds = %34
  %43 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %9) #4
  %44 = load i32, ptr %43, align 4, !tbaa !9
  %45 = load ptr, ptr %7, align 8, !tbaa !5
  %46 = load ptr, ptr %8, align 8, !tbaa !5
  call void @_ZN5Graph19topologicalSortUtilEiPbRSt5stackIiSt5dequeIiSaIiEEE(ptr noundef nonnull align 8 dereferenceable(16) %13, i32 noundef %44, ptr noundef %45, ptr noundef nonnull align 8 dereferenceable(80) %46)
  br label %47

47:                                               ; preds = %42, %34
  br label %48

48:                                               ; preds = %47
  %49 = call ptr @_ZNSt14_List_iteratorIiEppEi(ptr noundef nonnull align 8 dereferenceable(8) %9, i32 noundef 0) #4
  %50 = getelementptr inbounds %"struct.std::_List_iterator", ptr %12, i32 0, i32 0
  store ptr %49, ptr %50, align 8
  br label %25, !llvm.loop !18

51:                                               ; preds = %25
  %52 = load ptr, ptr %8, align 8, !tbaa !5
  call void @_ZNSt5stackIiSt5dequeIiSaIiEEE4pushERKi(ptr noundef nonnull align 8 dereferenceable(80) %52, ptr noundef nonnull align 4 dereferenceable(4) %6)
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #4
  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 void @_ZNSt14_List_iteratorIiEC2Ev(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt7__cxx114listIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #3

; 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 zeroext i1 @_ZStneRKSt14_List_iteratorIiES2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt7__cxx114listIiSaIiEE3endEv(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 @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt14_List_iteratorIiEppEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
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 = !{!"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 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = !{!14, !6, i64 8}
!14 = !{!"_ZTS5Graph", !10, i64 0, !6, i64 8}
!15 = !{i64 0, i64 8, !5}
!16 = !{i8 0, i8 2}
!17 = !{}
!18 = distinct !{!18, !19}
!19 = !{!"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::_List_iterator" = type { ptr }
%"class.std::__cxx11::list" = type { %"class.std::__cxx11::_List_base" }
%"class.std::__cxx11::_List_base" = type { %"struct.std::__cxx11::_List_base<int, std::allocator<int>>::_List_impl" }
%"struct.std::__cxx11::_List_base<int, std::allocator<int>>::_List_impl" = type { %"struct.std::__detail::_List_node_header" }
%"struct.std::__detail::_List_node_header" = type { %"struct.std::__detail::_List_node_base", i64 }
%"struct.std::__detail::_List_node_base" = type { ptr, ptr }

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN5Graph19topologicalSortUtilEiPbRSt5stackIiSt5dequeIiSaIiEEE(ptr nocapture noundef nonnull readonly align 8 dereferenceable(16) %0, i32 noundef %1, ptr nocapture noundef %2, ptr noundef nonnull align 8 dereferenceable(80) %3) local_unnamed_addr #0 align 2 {
  %5 = alloca i32, align 4
  %6 = alloca %"struct.std::_List_iterator", align 8
  %7 = alloca %"struct.std::_List_iterator", align 8
  store i32 %1, ptr %5, align 4, !tbaa !5
  %8 = sext i32 %1 to i64
  %9 = getelementptr inbounds i8, ptr %2, i64 %8
  store i8 1, ptr %9, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %6) #3
  call void @_ZNSt14_List_iteratorIiEC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %6) #3
  %10 = getelementptr inbounds i8, ptr %0, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  %12 = getelementptr inbounds %"class.std::__cxx11::list", ptr %11, i64 %8
  %13 = call ptr @_ZNSt7__cxx114listIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) %12) #3
  store ptr %13, ptr %6, align 8, !tbaa !14
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %7) #3
  %14 = load ptr, ptr %10, align 8, !tbaa !11
  %15 = getelementptr inbounds %"class.std::__cxx11::list", ptr %14, i64 %8
  %16 = call ptr @_ZNSt7__cxx114listIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %15) #3
  store ptr %16, ptr %7, align 8
  %17 = call noundef zeroext i1 @_ZStneRKSt14_List_iteratorIiES2_(ptr noundef nonnull align 8 dereferenceable(8) %6, ptr noundef nonnull align 8 dereferenceable(8) %7) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %7) #3
  br i1 %17, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %4, %27
  %18 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #3
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds i8, ptr %2, i64 %20
  %22 = load i8, ptr %21, align 1, !tbaa !9, !range !15, !noundef !16
  %23 = trunc nuw i8 %22 to i1
  br i1 %23, label %27, label %24

24:                                               ; preds = %.lr.ph
  %25 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #3
  %26 = load i32, ptr %25, align 4, !tbaa !5
  call void @_ZN5Graph19topologicalSortUtilEiPbRSt5stackIiSt5dequeIiSaIiEEE(ptr noundef nonnull align 8 dereferenceable(16) %0, i32 noundef %26, ptr noundef nonnull %2, ptr noundef nonnull align 8 dereferenceable(80) %3)
  br label %27

27:                                               ; preds = %.lr.ph, %24
  %28 = call ptr @_ZNSt14_List_iteratorIiEppEi(ptr noundef nonnull align 8 dereferenceable(8) %6, i32 noundef 0) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %7) #3
  %29 = load ptr, ptr %10, align 8, !tbaa !11
  %30 = getelementptr inbounds %"class.std::__cxx11::list", ptr %29, i64 %8
  %31 = call ptr @_ZNSt7__cxx114listIiSaIiEE3endEv(ptr noundef nonnull align 8 dereferenceable(24) %30) #3
  store ptr %31, ptr %7, align 8
  %32 = call noundef zeroext i1 @_ZStneRKSt14_List_iteratorIiES2_(ptr noundef nonnull align 8 dereferenceable(8) %6, ptr noundef nonnull align 8 dereferenceable(8) %7) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %7) #3
  br i1 %32, label %.lr.ph, label %._crit_edge, !llvm.loop !17

._crit_edge:                                      ; preds = %27, %4
  call void @_ZNSt5stackIiSt5dequeIiSaIiEEE4pushERKi(ptr noundef nonnull align 8 dereferenceable(80) %3, ptr noundef nonnull align 4 dereferenceable(4) %5)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %6) #3
  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 void @_ZNSt14_List_iteratorIiEC2Ev(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt7__cxx114listIiSaIiEE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) 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 zeroext i1 @_ZStneRKSt14_List_iteratorIiES2_(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 ptr @_ZNSt7__cxx114listIiSaIiEE3endEv(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 @_ZNKSt14_List_iteratorIiEdeEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt14_List_iteratorIiEppEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) 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 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{!12, !13, i64 8}
!12 = !{!"_ZTS5Graph", !6, i64 0, !13, i64 8}
!13 = !{!"any pointer", !7, i64 0}
!14 = !{!13, !13, i64 0}
!15 = !{i8 0, i8 2}
!16 = !{}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}


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