; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/ds/iterative_preorder.ll (Z8preorderP8TreeNode)

; 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 @_Z8preorderP8TreeNode(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %5, 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
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef %4, ptr noundef %6)
  br label %7

7:                                                ; preds = %27, %1
  %8 = call noundef i32 @_Z7isEmptyPP5Stack(ptr noundef %4)
  %9 = icmp ne i32 %8, 0
  %10 = xor i1 %9, true
  br i1 %10, label %11, label %28

11:                                               ; preds = %7
  %12 = call noundef ptr @_Z3popPP5Stack(ptr noundef %4)
  store ptr %12, ptr %3, align 8, !tbaa !5
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = icmp ne ptr %13, null
  br i1 %14, label %15, label %27

15:                                               ; preds = %11
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %class.TreeNode, ptr %16, i32 0, i32 0
  %18 = load i8, ptr %17, align 8, !tbaa !9
  %19 = sext i8 %18 to i32
  %20 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %19)
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = getelementptr inbounds %class.TreeNode, ptr %21, i32 0, i32 2
  %23 = load ptr, ptr %22, align 8, !tbaa !11
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef %4, ptr noundef %23)
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  %25 = getelementptr inbounds %class.TreeNode, ptr %24, i32 0, i32 1
  %26 = load ptr, ptr %25, align 8, !tbaa !12
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef %4, ptr noundef %26)
  br label %27

27:                                               ; preds = %15, %11
  br label %7, !llvm.loop !13

28:                                               ; preds = %7
  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, !7, i64 0}
!10 = !{!"_ZTS8TreeNode", !7, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!10, !6, i64 16}
!12 = !{!10, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"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"

@.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 @_Z8preorderP8TreeNode(ptr noundef %0) local_unnamed_addr #0 {
  %2 = 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 @_Z4pushPP5StackP8TreeNode(ptr noundef nonnull %2, ptr noundef %0)
  %3 = call noundef i32 @_Z7isEmptyPP5Stack(ptr noundef nonnull %2)
  %.not7 = icmp eq i32 %3, 0
  br i1 %.not7, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1, %13
  %4 = call noundef ptr @_Z3popPP5Stack(ptr noundef nonnull %2)
  %.not6 = icmp eq ptr %4, null
  br i1 %.not6, label %13, label %5

5:                                                ; preds = %.lr.ph
  %6 = load i8, ptr %4, align 8, !tbaa !9
  %7 = sext i8 %6 to i32
  %8 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %7)
  %9 = getelementptr inbounds i8, ptr %4, i64 16
  %10 = load ptr, ptr %9, align 8, !tbaa !11
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef nonnull %2, ptr noundef %10)
  %11 = getelementptr inbounds i8, ptr %4, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !12
  call void @_Z4pushPP5StackP8TreeNode(ptr noundef nonnull %2, ptr noundef %12)
  br label %13

13:                                               ; preds = %5, %.lr.ph
  %14 = call noundef i32 @_Z7isEmptyPP5Stack(ptr noundef nonnull %2)
  %.not = icmp eq i32 %14, 0
  br i1 %.not, label %.lr.ph, label %._crit_edge, !llvm.loop !13

._crit_edge:                                      ; preds = %13, %1
  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, !7, i64 0}
!10 = !{!"_ZTS8TreeNode", !7, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!10, !6, i64 16}
!12 = !{!10, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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