; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 14. Tree/all_traversal_of_tree_using_recursion_and_iteration.ll (Z14printPostorderP4Node)

; 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::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%struct.Node = type { i32, ptr, ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [2 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_Z6insertP5stackP4Node(ptr noundef, ptr 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_Z3popRP5stack(ptr noundef nonnull align 8 dereferenceable(8)) #0

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #2

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #3

; Function Attrs: mustprogress uwtable
define dso_local void @_Z14printPostorderP4Node(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %8, label %10

8:                                                ; preds = %1
  %9 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef @.str.1)
  br label %56

10:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #4
  store ptr null, ptr %4, align 8, !tbaa !5
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = call noundef ptr @_Z6insertP5stackP4Node(ptr noundef %11, ptr noundef %12)
  store ptr %13, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  store ptr null, ptr %5, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %43, %10
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = icmp ne ptr %15, null
  br i1 %16, label %17, label %44

17:                                               ; preds = %14
  %18 = call noundef ptr @_Z3popRP5stack(ptr noundef nonnull align 8 dereferenceable(8) %4)
  store ptr %18, ptr %3, align 8, !tbaa !5
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = call noundef ptr @_Z6insertP5stackP4Node(ptr noundef %19, ptr noundef %20)
  store ptr %21, ptr %5, align 8, !tbaa !5
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.Node, ptr %22, i32 0, i32 1
  %24 = load ptr, ptr %23, align 8, !tbaa !9
  %25 = icmp ne ptr %24, null
  br i1 %25, label %26, label %32

26:                                               ; preds = %17
  %27 = load ptr, ptr %4, align 8, !tbaa !5
  %28 = load ptr, ptr %3, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.Node, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !9
  %31 = call noundef ptr @_Z6insertP5stackP4Node(ptr noundef %27, ptr noundef %30)
  store ptr %31, ptr %4, align 8, !tbaa !5
  br label %32

32:                                               ; preds = %26, %17
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.Node, ptr %33, i32 0, i32 2
  %35 = load ptr, ptr %34, align 8, !tbaa !12
  %36 = icmp ne ptr %35, null
  br i1 %36, label %37, label %43

37:                                               ; preds = %32
  %38 = load ptr, ptr %4, align 8, !tbaa !5
  %39 = load ptr, ptr %3, align 8, !tbaa !5
  %40 = getelementptr inbounds %struct.Node, ptr %39, i32 0, i32 2
  %41 = load ptr, ptr %40, align 8, !tbaa !12
  %42 = call noundef ptr @_Z6insertP5stackP4Node(ptr noundef %38, ptr noundef %41)
  store ptr %42, ptr %4, align 8, !tbaa !5
  br label %43

43:                                               ; preds = %37, %32
  br label %14, !llvm.loop !13

44:                                               ; preds = %14
  br label %45

45:                                               ; preds = %48, %44
  %46 = load ptr, ptr %5, align 8, !tbaa !5
  %47 = icmp ne ptr %46, null
  br i1 %47, label %48, label %55

48:                                               ; preds = %45
  %49 = call noundef ptr @_Z3popRP5stack(ptr noundef nonnull align 8 dereferenceable(8) %5)
  store ptr %49, ptr %3, align 8, !tbaa !5
  %50 = load ptr, ptr %3, align 8, !tbaa !5
  %51 = getelementptr inbounds %struct.Node, ptr %50, i32 0, i32 0
  %52 = load i32, ptr %51, align 8, !tbaa !15
  %53 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %52)
  %54 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) %53, ptr noundef @.str)
  br label %45, !llvm.loop !16

55:                                               ; preds = %45
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #4
  br label %56

56:                                               ; preds = %55, %8
  ret void
}

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 = { inlinehint 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 #3 = { "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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"_ZTS4Node", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 16}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!10, !11, i64 0}
!16 = distinct !{!16, !14}


; 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::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [2 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_Z6insertP5stackP4Node(ptr noundef, ptr 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 nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_Z3popRP5stack(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #0

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #2

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #3

; Function Attrs: mustprogress uwtable
define dso_local void @_Z14printPostorderP4Node(ptr noundef %0) local_unnamed_addr #0 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = icmp eq ptr %0, null
  br i1 %4, label %5, label %7

5:                                                ; preds = %1
  %6 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef nonnull @.str.1)
  br label %28

7:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #4
  %8 = tail call noundef ptr @_Z6insertP5stackP4Node(ptr noundef null, ptr noundef nonnull %0)
  store ptr %8, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #4
  %.not13 = icmp eq ptr %8, null
  br i1 %.not13, label %._crit_edge, label %.lr.ph

.preheader:                                       ; preds = %22
  %9 = icmp eq ptr %12, null
  br i1 %9, label %._crit_edge, label %.lr.ph15

.lr.ph:                                           ; preds = %7, %22
  %10 = phi ptr [ %12, %22 ], [ null, %7 ]
  %11 = call noundef ptr @_Z3popRP5stack(ptr noundef nonnull align 8 dereferenceable(8) %2)
  %12 = call noundef ptr @_Z6insertP5stackP4Node(ptr noundef %10, ptr noundef %11)
  store ptr %12, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds i8, ptr %11, i64 8
  %14 = load ptr, ptr %13, align 8, !tbaa !9
  %.not11 = icmp eq ptr %14, null
  %.pr.pre.pre = load ptr, ptr %2, align 8, !tbaa !5
  br i1 %.not11, label %17, label %15

15:                                               ; preds = %.lr.ph
  %16 = call noundef ptr @_Z6insertP5stackP4Node(ptr noundef %.pr.pre.pre, ptr noundef nonnull %14)
  store ptr %16, ptr %2, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %15, %.lr.ph
  %.pr.pre = phi ptr [ %16, %15 ], [ %.pr.pre.pre, %.lr.ph ]
  %18 = getelementptr inbounds i8, ptr %11, i64 16
  %19 = load ptr, ptr %18, align 8, !tbaa !12
  %.not12 = icmp eq ptr %19, null
  br i1 %.not12, label %22, label %20

20:                                               ; preds = %17
  %21 = call noundef ptr @_Z6insertP5stackP4Node(ptr noundef %.pr.pre, ptr noundef nonnull %19)
  store ptr %21, ptr %2, align 8, !tbaa !5
  br label %22

22:                                               ; preds = %20, %17
  %.pr = phi ptr [ %21, %20 ], [ %.pr.pre, %17 ]
  %.not = icmp eq ptr %.pr, null
  br i1 %.not, label %.preheader, label %.lr.ph, !llvm.loop !13

.lr.ph15:                                         ; preds = %.preheader, %.lr.ph15
  %23 = call noundef ptr @_Z3popRP5stack(ptr noundef nonnull align 8 dereferenceable(8) %3)
  %24 = load i32, ptr %23, align 8, !tbaa !15
  %25 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %24)
  %26 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) %25, ptr noundef nonnull @.str)
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %.not10 = icmp eq ptr %27, null
  br i1 %.not10, label %._crit_edge, label %.lr.ph15, !llvm.loop !16

._crit_edge:                                      ; preds = %.lr.ph15, %7, %.preheader
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #4
  br label %28

28:                                               ; preds = %._crit_edge, %5
  ret void
}

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 = { inlinehint 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 #3 = { "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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"_ZTS4Node", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 16}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!10, !11, i64 0}
!16 = distinct !{!16, !14}


; Effective O3 passes: DSEPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass