; LLVM IR from begeekmyfriend/leetcode :: 0102_binary_tree_level_order_traversal (bst_bfs)

; 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 }

@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca %struct.TreeNode, align 8
  %3 = alloca [2 x %struct.TreeNode], align 16
  %4 = alloca [4 x %struct.TreeNode], align 16
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 24, ptr %2) #3
  %10 = getelementptr inbounds %struct.TreeNode, ptr %2, i32 0, i32 0
  store i32 3, ptr %10, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 48, ptr %3) #3
  %11 = getelementptr inbounds [2 x %struct.TreeNode], ptr %3, i64 0, i64 0
  %12 = getelementptr inbounds %struct.TreeNode, ptr %11, i32 0, i32 0
  store i32 9, ptr %12, align 16, !tbaa !5
  %13 = getelementptr inbounds [2 x %struct.TreeNode], ptr %3, i64 0, i64 1
  %14 = getelementptr inbounds %struct.TreeNode, ptr %13, i32 0, i32 0
  store i32 20, ptr %14, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 96, ptr %4) #3
  %15 = getelementptr inbounds [4 x %struct.TreeNode], ptr %4, i64 0, i64 2
  %16 = getelementptr inbounds %struct.TreeNode, ptr %15, i32 0, i32 0
  store i32 15, ptr %16, align 16, !tbaa !5
  %17 = getelementptr inbounds [4 x %struct.TreeNode], ptr %4, i64 0, i64 3
  %18 = getelementptr inbounds %struct.TreeNode, ptr %17, i32 0, i32 0
  store i32 7, ptr %18, align 8, !tbaa !5
  %19 = getelementptr inbounds [2 x %struct.TreeNode], ptr %3, i64 0, i64 0
  %20 = getelementptr inbounds %struct.TreeNode, ptr %2, i32 0, i32 1
  store ptr %19, ptr %20, align 8, !tbaa !11
  %21 = getelementptr inbounds [2 x %struct.TreeNode], ptr %3, i64 0, i64 1
  %22 = getelementptr inbounds %struct.TreeNode, ptr %2, i32 0, i32 2
  store ptr %21, ptr %22, align 8, !tbaa !12
  %23 = getelementptr inbounds [2 x %struct.TreeNode], ptr %3, i64 0, i64 0
  %24 = getelementptr inbounds %struct.TreeNode, ptr %23, i32 0, i32 1
  store ptr null, ptr %24, align 8, !tbaa !11
  %25 = getelementptr inbounds [2 x %struct.TreeNode], ptr %3, i64 0, i64 0
  %26 = getelementptr inbounds %struct.TreeNode, ptr %25, i32 0, i32 2
  store ptr null, ptr %26, align 16, !tbaa !12
  %27 = getelementptr inbounds [4 x %struct.TreeNode], ptr %4, i64 0, i64 2
  %28 = getelementptr inbounds [2 x %struct.TreeNode], ptr %3, i64 0, i64 1
  %29 = getelementptr inbounds %struct.TreeNode, ptr %28, i32 0, i32 1
  store ptr %27, ptr %29, align 8, !tbaa !11
  %30 = getelementptr inbounds [4 x %struct.TreeNode], ptr %4, i64 0, i64 3
  %31 = getelementptr inbounds [2 x %struct.TreeNode], ptr %3, i64 0, i64 1
  %32 = getelementptr inbounds %struct.TreeNode, ptr %31, i32 0, i32 2
  store ptr %30, ptr %32, align 8, !tbaa !12
  %33 = getelementptr inbounds [4 x %struct.TreeNode], ptr %4, i64 0, i64 0
  %34 = getelementptr inbounds %struct.TreeNode, ptr %33, i32 0, i32 1
  store ptr null, ptr %34, align 8, !tbaa !11
  %35 = getelementptr inbounds [4 x %struct.TreeNode], ptr %4, i64 0, i64 0
  %36 = getelementptr inbounds %struct.TreeNode, ptr %35, i32 0, i32 2
  store ptr null, ptr %36, align 16, !tbaa !12
  %37 = getelementptr inbounds [4 x %struct.TreeNode], ptr %4, i64 0, i64 1
  %38 = getelementptr inbounds %struct.TreeNode, ptr %37, i32 0, i32 1
  store ptr null, ptr %38, align 8, !tbaa !11
  %39 = getelementptr inbounds [4 x %struct.TreeNode], ptr %4, i64 0, i64 1
  %40 = getelementptr inbounds %struct.TreeNode, ptr %39, i32 0, i32 2
  store ptr null, ptr %40, align 8, !tbaa !12
  %41 = getelementptr inbounds [4 x %struct.TreeNode], ptr %4, i64 0, i64 2
  %42 = getelementptr inbounds %struct.TreeNode, ptr %41, i32 0, i32 1
  store ptr null, ptr %42, align 8, !tbaa !11
  %43 = getelementptr inbounds [4 x %struct.TreeNode], ptr %4, i64 0, i64 2
  %44 = getelementptr inbounds %struct.TreeNode, ptr %43, i32 0, i32 2
  store ptr null, ptr %44, align 16, !tbaa !12
  %45 = getelementptr inbounds [4 x %struct.TreeNode], ptr %4, i64 0, i64 3
  %46 = getelementptr inbounds %struct.TreeNode, ptr %45, i32 0, i32 1
  store ptr null, ptr %46, align 8, !tbaa !11
  %47 = getelementptr inbounds [4 x %struct.TreeNode], ptr %4, i64 0, i64 3
  %48 = getelementptr inbounds %struct.TreeNode, ptr %47, i32 0, i32 2
  store ptr null, ptr %48, align 8, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  store i32 0, ptr %7, align 4, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  %49 = call ptr @levelOrder(ptr noundef %2, ptr noundef %7, ptr noundef %8)
  store ptr %49, ptr %9, align 8, !tbaa !14
  store i32 0, ptr %5, align 4, !tbaa !13
  br label %50

50:                                               ; preds = %79, %0
  %51 = load i32, ptr %5, align 4, !tbaa !13
  %52 = load i32, ptr %7, align 4, !tbaa !13
  %53 = icmp slt i32 %51, %52
  br i1 %53, label %54, label %82

54:                                               ; preds = %50
  store i32 0, ptr %6, align 4, !tbaa !13
  br label %55

55:                                               ; preds = %74, %54
  %56 = load i32, ptr %6, align 4, !tbaa !13
  %57 = load ptr, ptr %8, align 8, !tbaa !14
  %58 = load i32, ptr %5, align 4, !tbaa !13
  %59 = sext i32 %58 to i64
  %60 = getelementptr inbounds i32, ptr %57, i64 %59
  %61 = load i32, ptr %60, align 4, !tbaa !13
  %62 = icmp slt i32 %56, %61
  br i1 %62, label %63, label %77

63:                                               ; preds = %55
  %64 = load ptr, ptr %9, align 8, !tbaa !14
  %65 = load i32, ptr %5, align 4, !tbaa !13
  %66 = sext i32 %65 to i64
  %67 = getelementptr inbounds ptr, ptr %64, i64 %66
  %68 = load ptr, ptr %67, align 8, !tbaa !14
  %69 = load i32, ptr %6, align 4, !tbaa !13
  %70 = sext i32 %69 to i64
  %71 = getelementptr inbounds i32, ptr %68, i64 %70
  %72 = load i32, ptr %71, align 4, !tbaa !13
  %73 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %72)
  br label %74

74:                                               ; preds = %63
  %75 = load i32, ptr %6, align 4, !tbaa !13
  %76 = add nsw i32 %75, 1
  store i32 %76, ptr %6, align 4, !tbaa !13
  br label %55, !llvm.loop !15

77:                                               ; preds = %55
  %78 = call i32 (ptr, ...) @printf(ptr noundef @.str.1)
  br label %79

79:                                               ; preds = %77
  %80 = load i32, ptr %5, align 4, !tbaa !13
  %81 = add nsw i32 %80, 1
  store i32 %81, ptr %5, align 4, !tbaa !13
  br label %50, !llvm.loop !17

82:                                               ; preds = %50
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 96, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 48, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 24, ptr %2) #3
  ret i32 0
}

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

; Function Attrs: nounwind uwtable
declare hidden ptr @levelOrder(ptr noundef, ptr noundef, ptr noundef) #0

declare i32 @printf(ptr 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 = { "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, !7, i64 0}
!6 = !{!"TreeNode", !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 = !{!6, !10, i64 8}
!12 = !{!6, !10, i64 16}
!13 = !{!7, !7, i64 0}
!14 = !{!10, !10, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}
!17 = distinct !{!17, !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"

%struct.TreeNode = type { i32, ptr, ptr }

@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca %struct.TreeNode, align 8
  %2 = alloca [2 x %struct.TreeNode], align 16
  %3 = alloca [4 x %struct.TreeNode], align 16
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %1) #4
  store i32 3, ptr %1, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 48, ptr nonnull %2) #4
  store i32 9, ptr %2, align 16, !tbaa !5
  %6 = getelementptr inbounds i8, ptr %2, i64 24
  store i32 20, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 96, ptr nonnull %3) #4
  %7 = getelementptr inbounds i8, ptr %3, i64 48
  store i32 15, ptr %7, align 16, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %3, i64 72
  store i32 7, ptr %8, align 8, !tbaa !5
  %9 = getelementptr inbounds i8, ptr %1, i64 8
  store ptr %2, ptr %9, align 8, !tbaa !11
  %10 = getelementptr inbounds i8, ptr %1, i64 16
  store ptr %6, ptr %10, align 8, !tbaa !12
  %11 = getelementptr inbounds i8, ptr %2, i64 8
  %12 = getelementptr inbounds i8, ptr %2, i64 32
  call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %11, i8 0, i64 16, i1 false)
  store ptr %7, ptr %12, align 16, !tbaa !11
  %13 = getelementptr inbounds i8, ptr %2, i64 40
  store ptr %8, ptr %13, align 8, !tbaa !12
  %14 = getelementptr inbounds i8, ptr %3, i64 8
  %15 = getelementptr inbounds i8, ptr %3, i64 32
  %16 = getelementptr inbounds i8, ptr %3, i64 56
  %17 = getelementptr inbounds i8, ptr %3, i64 80
  call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %14, i8 0, i64 16, i1 false)
  call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(16) %15, i8 0, i64 16, i1 false)
  call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %16, i8 0, i64 16, i1 false)
  call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(16) %17, i8 0, i64 16, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #4
  store i32 0, ptr %4, align 4, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %5) #4
  %18 = call ptr @levelOrder(ptr noundef nonnull %1, ptr noundef nonnull %4, ptr noundef nonnull %5)
  %19 = load i32, ptr %4, align 4, !tbaa !13
  %20 = icmp sgt i32 %19, 0
  br i1 %20, label %.preheader, label %._crit_edge10

.preheader:                                       ; preds = %0, %._crit_edge
  %indvars.iv12 = phi i64 [ %indvars.iv.next13, %._crit_edge ], [ 0, %0 ]
  %21 = load ptr, ptr %5, align 8, !tbaa !14
  %22 = getelementptr inbounds i32, ptr %21, i64 %indvars.iv12
  %23 = load i32, ptr %22, align 4, !tbaa !13
  %24 = icmp sgt i32 %23, 0
  br i1 %24, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %.preheader
  %25 = getelementptr inbounds ptr, ptr %18, i64 %indvars.iv12
  br label %26

26:                                               ; preds = %.lr.ph, %26
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %26 ]
  %27 = load ptr, ptr %25, align 8, !tbaa !14
  %28 = getelementptr inbounds i32, ptr %27, i64 %indvars.iv
  %29 = load i32, ptr %28, align 4, !tbaa !13
  %30 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %29)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %31 = load ptr, ptr %5, align 8, !tbaa !14
  %32 = getelementptr inbounds i32, ptr %31, i64 %indvars.iv12
  %33 = load i32, ptr %32, align 4, !tbaa !13
  %34 = sext i32 %33 to i64
  %35 = icmp slt i64 %indvars.iv.next, %34
  br i1 %35, label %26, label %._crit_edge, !llvm.loop !15

._crit_edge:                                      ; preds = %26, %.preheader
  %36 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1)
  %indvars.iv.next13 = add nuw nsw i64 %indvars.iv12, 1
  %37 = load i32, ptr %4, align 4, !tbaa !13
  %38 = sext i32 %37 to i64
  %39 = icmp slt i64 %indvars.iv.next13, %38
  br i1 %39, label %.preheader, label %._crit_edge10, !llvm.loop !17

._crit_edge10:                                    ; preds = %._crit_edge, %0
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %5) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #4
  call void @llvm.lifetime.end.p0(i64 96, ptr nonnull %3) #4
  call void @llvm.lifetime.end.p0(i64 48, ptr nonnull %2) #4
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %1) #4
  ret i32 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: nounwind uwtable
declare hidden ptr @levelOrder(ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

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

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #3

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #3 = { nocallback nofree nounwind willreturn memory(argmem: write) }
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, !7, i64 0}
!6 = !{!"TreeNode", !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 = !{!6, !10, i64 8}
!12 = !{!6, !10, i64 16}
!13 = !{!7, !7, i64 0}
!14 = !{!10, !10, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}
!17 = distinct !{!17, !16}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass