; LLVM IR from div-bargali/Data-Structures-and-Algorithms :: C/Algorithms/Graph-Algorithms (tree_traversal)

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

@root = external dso_local global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local void @insert(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %7 = call noalias ptr @malloc(i64 noundef 24) #4
  store ptr %7, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = load ptr, ptr %3, align 8, !tbaa !9
  %10 = getelementptr inbounds %struct.node, ptr %9, i32 0, i32 0
  store i32 %8, ptr %10, align 8, !tbaa !11
  %11 = load ptr, ptr %3, align 8, !tbaa !9
  %12 = getelementptr inbounds %struct.node, ptr %11, i32 0, i32 1
  store ptr null, ptr %12, align 8, !tbaa !13
  %13 = load ptr, ptr %3, align 8, !tbaa !9
  %14 = getelementptr inbounds %struct.node, ptr %13, i32 0, i32 2
  store ptr null, ptr %14, align 8, !tbaa !14
  %15 = load ptr, ptr @root, align 8, !tbaa !9
  %16 = icmp eq ptr %15, null
  br i1 %16, label %17, label %19

17:                                               ; preds = %1
  %18 = load ptr, ptr %3, align 8, !tbaa !9
  store ptr %18, ptr @root, align 8, !tbaa !9
  br label %52

19:                                               ; preds = %1
  %20 = load ptr, ptr @root, align 8, !tbaa !9
  store ptr %20, ptr %4, align 8, !tbaa !9
  store ptr null, ptr %5, align 8, !tbaa !9
  br label %21

21:                                               ; preds = %51, %19
  br label %22

22:                                               ; preds = %21
  %23 = load ptr, ptr %4, align 8, !tbaa !9
  store ptr %23, ptr %5, align 8, !tbaa !9
  %24 = load i32, ptr %2, align 4, !tbaa !5
  %25 = load ptr, ptr %5, align 8, !tbaa !9
  %26 = getelementptr inbounds %struct.node, ptr %25, i32 0, i32 0
  %27 = load i32, ptr %26, align 8, !tbaa !11
  %28 = icmp slt i32 %24, %27
  br i1 %28, label %29, label %40

29:                                               ; preds = %22
  %30 = load ptr, ptr %4, align 8, !tbaa !9
  %31 = getelementptr inbounds %struct.node, ptr %30, i32 0, i32 1
  %32 = load ptr, ptr %31, align 8, !tbaa !13
  store ptr %32, ptr %4, align 8, !tbaa !9
  %33 = load ptr, ptr %4, align 8, !tbaa !9
  %34 = icmp eq ptr %33, null
  br i1 %34, label %35, label %39

35:                                               ; preds = %29
  %36 = load ptr, ptr %3, align 8, !tbaa !9
  %37 = load ptr, ptr %5, align 8, !tbaa !9
  %38 = getelementptr inbounds %struct.node, ptr %37, i32 0, i32 1
  store ptr %36, ptr %38, align 8, !tbaa !13
  store i32 1, ptr %6, align 4
  br label %53

39:                                               ; preds = %29
  br label %51

40:                                               ; preds = %22
  %41 = load ptr, ptr %4, align 8, !tbaa !9
  %42 = getelementptr inbounds %struct.node, ptr %41, i32 0, i32 2
  %43 = load ptr, ptr %42, align 8, !tbaa !14
  store ptr %43, ptr %4, align 8, !tbaa !9
  %44 = load ptr, ptr %4, align 8, !tbaa !9
  %45 = icmp eq ptr %44, null
  br i1 %45, label %46, label %50

46:                                               ; preds = %40
  %47 = load ptr, ptr %3, align 8, !tbaa !9
  %48 = load ptr, ptr %5, align 8, !tbaa !9
  %49 = getelementptr inbounds %struct.node, ptr %48, i32 0, i32 2
  store ptr %47, ptr %49, align 8, !tbaa !14
  store i32 1, ptr %6, align 4
  br label %53

50:                                               ; preds = %40
  br label %51

51:                                               ; preds = %50, %39
  br label %21

52:                                               ; preds = %17
  store i32 0, ptr %6, align 4
  br label %53

53:                                               ; preds = %52, %46, %35
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  %54 = load i32, ptr %6, align 4
  switch i32 %54, label %56 [
    i32 0, label %55
    i32 1, label %55
  ]

55:                                               ; preds = %53, %53
  ret void

56:                                               ; preds = %53
  unreachable
}

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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

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

attributes #0 = { 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 = { nounwind allocsize(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 }
attributes #4 = { nounwind allocsize(0) }

!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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"node", !6, i64 0, !10, i64 8, !10, i64 16}
!13 = !{!12, !10, i64 8}
!14 = !{!12, !10, 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"

@root = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nofree nounwind uwtable
define dso_local void @insert(i32 noundef %0) local_unnamed_addr #0 {
  %2 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #3
  store i32 %0, ptr %2, align 8, !tbaa !5
  %3 = getelementptr inbounds i8, ptr %2, i64 8
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %3, i8 0, i64 16, i1 false)
  %4 = load ptr, ptr @root, align 8, !tbaa !11
  %5 = icmp eq ptr %4, null
  br i1 %5, label %20, label %.preheader

.preheader:                                       ; preds = %1, %.preheader.backedge
  %.0 = phi ptr [ %.0.be, %.preheader.backedge ], [ %4, %1 ]
  %6 = load i32, ptr %.0, align 8, !tbaa !5
  %7 = icmp sgt i32 %6, %0
  br i1 %7, label %8, label %14

8:                                                ; preds = %.preheader
  %9 = getelementptr inbounds i8, ptr %.0, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !12
  %11 = icmp eq ptr %10, null
  br i1 %11, label %12, label %.preheader.backedge

12:                                               ; preds = %8
  %13 = getelementptr inbounds i8, ptr %.0, i64 8
  br label %20

14:                                               ; preds = %.preheader
  %15 = getelementptr inbounds i8, ptr %.0, i64 16
  %16 = load ptr, ptr %15, align 8, !tbaa !13
  %17 = icmp eq ptr %16, null
  br i1 %17, label %18, label %.preheader.backedge

.preheader.backedge:                              ; preds = %14, %8
  %.0.be = phi ptr [ %10, %8 ], [ %16, %14 ]
  br label %.preheader

18:                                               ; preds = %14
  %19 = getelementptr inbounds i8, ptr %.0, i64 16
  br label %20

20:                                               ; preds = %1, %18, %12
  %root.sink = phi ptr [ %19, %18 ], [ %13, %12 ], [ @root, %1 ]
  store ptr %2, ptr %root.sink, align 8, !tbaa !11
  ret void
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

attributes #0 = { nofree 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 nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 #2 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #3 = { nounwind allocsize(0) }

!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, !7, i64 0}
!6 = !{!"node", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!10, !10, i64 0}
!12 = !{!6, !10, i64 8}
!13 = !{!6, !10, i64 16}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopSimplifyPass,LoopUnrollPass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass