; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/ds/iterative_postorder.ll (Z9postorderP8TreeNode)

; 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.TreeNode = type { i8, ptr, ptr }

@.str = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4pushPP5StackP8TreeNode(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 nounwind uwtable
declare dso_local noundef ptr @_Z3popPP5Stack(ptr noundef) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7isEmptyPP5Stack(ptr noundef) #2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9postorderP8TreeNode(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
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  store ptr null, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #4
  store ptr null, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %6, ptr %5, align 8, !tbaa !5
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef %3, ptr noundef %7)
  br label %8

8:                                                ; preds = %36, %1
  %9 = call noundef i32 @_Z7isEmptyPP5Stack(ptr noundef %3)
  %10 = icmp ne i32 %9, 0
  %11 = xor i1 %10, true
  br i1 %11, label %12, label %37

12:                                               ; preds = %8
  %13 = call noundef ptr @_Z3popPP5Stack(ptr noundef %3)
  store ptr %13, ptr %5, align 8, !tbaa !5
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = icmp ne ptr %14, null
  br i1 %15, label %16, label %18

16:                                               ; preds = %12
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef %4, ptr noundef %17)
  br label %18

18:                                               ; preds = %16, %12
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = getelementptr inbounds %class.TreeNode, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  %22 = icmp ne ptr %21, null
  br i1 %22, label %23, label %27

23:                                               ; preds = %18
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = getelementptr inbounds %class.TreeNode, ptr %24, i32 0, i32 1
  %26 = load ptr, ptr %25, align 8, !tbaa !9
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef %3, ptr noundef %26)
  br label %27

27:                                               ; preds = %23, %18
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = getelementptr inbounds %class.TreeNode, ptr %28, i32 0, i32 2
  %30 = load ptr, ptr %29, align 8, !tbaa !11
  %31 = icmp ne ptr %30, null
  br i1 %31, label %32, label %36

32:                                               ; preds = %27
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = getelementptr inbounds %class.TreeNode, ptr %33, i32 0, i32 2
  %35 = load ptr, ptr %34, align 8, !tbaa !11
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef %3, ptr noundef %35)
  br label %36

36:                                               ; preds = %32, %27
  br label %8, !llvm.loop !12

37:                                               ; preds = %8
  br label %38

38:                                               ; preds = %42, %37
  %39 = call noundef i32 @_Z7isEmptyPP5Stack(ptr noundef %4)
  %40 = icmp ne i32 %39, 0
  %41 = xor i1 %40, true
  br i1 %41, label %42, label %48

42:                                               ; preds = %38
  %43 = call noundef ptr @_Z3popPP5Stack(ptr noundef %4)
  %44 = getelementptr inbounds %class.TreeNode, ptr %43, i32 0, i32 0
  %45 = load i8, ptr %44, align 8, !tbaa !14
  %46 = sext i8 %45 to i32
  %47 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %46)
  br label %38, !llvm.loop !15

48:                                               ; preds = %38
  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
  ret void
}

declare i32 @printf(ptr noundef, ...) #3

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 = { "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 = !{!"_ZTS8TreeNode", !7, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!10, !6, i64 16}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!10, !7, i64 0}
!15 = distinct !{!15, !13}


; 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"

@.str = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4pushPP5StackP8TreeNode(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 nounwind uwtable
declare dso_local noundef ptr @_Z3popPP5Stack(ptr noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7isEmptyPP5Stack(ptr noundef) local_unnamed_addr #2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9postorderP8TreeNode(ptr noundef %0) local_unnamed_addr #0 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #4
  store ptr null, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #4
  store ptr null, ptr %3, align 8, !tbaa !5
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef nonnull %2, ptr noundef %0)
  %4 = call noundef i32 @_Z7isEmptyPP5Stack(ptr noundef nonnull %2)
  %.not14 = icmp eq i32 %4, 0
  br i1 %.not14, label %.lr.ph, label %.preheader

.preheader:                                       ; preds = %16, %1
  %5 = call noundef i32 @_Z7isEmptyPP5Stack(ptr noundef nonnull %3)
  %.not1015 = icmp eq i32 %5, 0
  br i1 %.not1015, label %.lr.ph16, label %._crit_edge

.lr.ph:                                           ; preds = %1, %16
  %6 = call noundef ptr @_Z3popPP5Stack(ptr noundef nonnull %2)
  %.not11 = icmp eq ptr %6, null
  br i1 %.not11, label %8, label %7

7:                                                ; preds = %.lr.ph
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef nonnull %3, ptr noundef nonnull %6)
  br label %8

8:                                                ; preds = %7, %.lr.ph
  %9 = getelementptr inbounds i8, ptr %6, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !9
  %.not12 = icmp eq ptr %10, null
  br i1 %.not12, label %12, label %11

11:                                               ; preds = %8
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef nonnull %2, ptr noundef nonnull %10)
  br label %12

12:                                               ; preds = %11, %8
  %13 = getelementptr inbounds i8, ptr %6, i64 16
  %14 = load ptr, ptr %13, align 8, !tbaa !11
  %.not13 = icmp eq ptr %14, null
  br i1 %.not13, label %16, label %15

15:                                               ; preds = %12
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef nonnull %2, ptr noundef nonnull %14)
  br label %16

16:                                               ; preds = %15, %12
  %17 = call noundef i32 @_Z7isEmptyPP5Stack(ptr noundef nonnull %2)
  %.not = icmp eq i32 %17, 0
  br i1 %.not, label %.lr.ph, label %.preheader, !llvm.loop !12

.lr.ph16:                                         ; preds = %.preheader, %.lr.ph16
  %18 = call noundef ptr @_Z3popPP5Stack(ptr noundef nonnull %3)
  %19 = load i8, ptr %18, align 8, !tbaa !14
  %20 = sext i8 %19 to i32
  %21 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %20)
  %22 = call noundef i32 @_Z7isEmptyPP5Stack(ptr noundef nonnull %3)
  %.not10 = icmp eq i32 %22, 0
  br i1 %.not10, label %.lr.ph16, label %._crit_edge, !llvm.loop !15

._crit_edge:                                      ; preds = %.lr.ph16, %.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
  ret void
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

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 = { nofree nounwind "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 = !{!"_ZTS8TreeNode", !7, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!10, !6, i64 16}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!10, !7, i64 0}
!15 = distinct !{!15, !13}


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