; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/cp (Binary_Tree_to_Doubly_Linked_List)

; 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.TreeNode = type { i32, ptr, ptr }

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_Z7newNodei(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: mustprogress uwtable
define dso_local noundef ptr @_Z6insertP8TreeNodeRSt5queueIS0_St5dequeIS0_SaIS0_EEEi(ptr noundef %0, ptr noundef nonnull align 8 dereferenceable(80) %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %8 = load i32, ptr %6, align 4, !tbaa !9
  %9 = call noundef ptr @_Z7newNodei(i32 noundef %8)
  store ptr %9, ptr %7, align 8, !tbaa !5
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = icmp eq i32 %10, -1
  br i1 %11, label %12, label %13

12:                                               ; preds = %3
  store ptr null, ptr %7, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %12, %3
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = icmp eq ptr %14, null
  br i1 %15, label %16, label %18

16:                                               ; preds = %13
  %17 = load ptr, ptr %7, align 8, !tbaa !5
  store ptr %17, ptr %4, align 8, !tbaa !5
  br label %39

18:                                               ; preds = %13
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80) %19)
  %21 = load ptr, ptr %20, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.TreeNode, ptr %21, i32 0, i32 1
  %23 = load ptr, ptr %22, align 8, !tbaa !11
  %24 = icmp eq ptr %23, null
  br i1 %24, label %25, label %31

25:                                               ; preds = %18
  %26 = load ptr, ptr %7, align 8, !tbaa !5
  %27 = load ptr, ptr %5, align 8, !tbaa !5
  %28 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80) %27)
  %29 = load ptr, ptr %28, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.TreeNode, ptr %29, i32 0, i32 1
  store ptr %26, ptr %30, align 8, !tbaa !11
  br label %38

31:                                               ; preds = %18
  %32 = load ptr, ptr %7, align 8, !tbaa !5
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80) %33)
  %35 = load ptr, ptr %34, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.TreeNode, ptr %35, i32 0, i32 2
  store ptr %32, ptr %36, align 8, !tbaa !13
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  call void @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80) %37)
  br label %38

38:                                               ; preds = %31, %25
  br label %39

39:                                               ; preds = %38, %16
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  call void @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80) %40, ptr noundef nonnull align 8 dereferenceable(8) %7)
  %41 = load ptr, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  ret ptr %41
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80)) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80), ptr noundef nonnull align 8 dereferenceable(8)) #0 align 2

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

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 = !{!12, !6, i64 8}
!12 = !{!"_ZTS8TreeNode", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !6, i64 16}


; 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"

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_Z7newNodei(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 uwtable
define dso_local noundef ptr @_Z6insertP8TreeNodeRSt5queueIS0_St5dequeIS0_SaIS0_EEEi(ptr noundef readnone %0, ptr noundef nonnull align 8 dereferenceable(80) %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  %5 = tail call noundef ptr @_Z7newNodei(i32 noundef %2)
  %6 = icmp eq i32 %2, -1
  %spec.store.select = select i1 %6, ptr null, ptr %5
  store ptr %spec.store.select, ptr %4, align 8
  %7 = icmp eq ptr %0, null
  br i1 %7, label %20, label %8

8:                                                ; preds = %3
  %9 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80) %1)
  %10 = load ptr, ptr %9, align 8, !tbaa !5
  %11 = getelementptr inbounds i8, ptr %10, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  %13 = icmp eq ptr %12, null
  %14 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80) %1)
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  br i1 %13, label %16, label %18

16:                                               ; preds = %8
  %17 = getelementptr inbounds i8, ptr %15, i64 8
  store ptr %spec.store.select, ptr %17, align 8, !tbaa !9
  br label %20

18:                                               ; preds = %8
  %19 = getelementptr inbounds i8, ptr %15, i64 16
  store ptr %spec.store.select, ptr %19, align 8, !tbaa !12
  tail call void @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80) %1)
  br label %20

20:                                               ; preds = %3, %16, %18
  %.0 = phi ptr [ %0, %16 ], [ %0, %18 ], [ %spec.store.select, %3 ]
  call void @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80) %1, ptr noundef nonnull align 8 dereferenceable(8) %4)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #3
  ret ptr %.0
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5queueIP8TreeNodeSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80), 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

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"_ZTS8TreeNode", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 16}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass