; LLVM IR from JessonYue/LeetCodeLearning :: Array/wuchao/tree/7-15 BST 实现 (BinarySearchTree)

; 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 }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local void @freeNode(ptr noundef %0) #1 {
  %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 = load ptr, ptr %6, align 8, !tbaa !5
  %8 = icmp eq ptr %7, null
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  br label %43

10:                                               ; preds = %1
  %11 = load ptr, ptr %2, align 8, !tbaa !5
  %12 = load ptr, ptr %11, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.TreeNode, ptr %12, i32 0, i32 1
  %14 = load ptr, ptr %13, align 8, !tbaa !9
  %15 = icmp ne ptr %14, null
  br i1 %15, label %16, label %24

16:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  %18 = load ptr, ptr %17, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.TreeNode, ptr %18, i32 0, i32 1
  %20 = load ptr, ptr %19, align 8, !tbaa !9
  store ptr %20, ptr %3, align 8, !tbaa !5
  %21 = load ptr, ptr %2, align 8, !tbaa !5
  %22 = load ptr, ptr %21, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.TreeNode, ptr %22, i32 0, i32 1
  store ptr null, ptr %23, align 8, !tbaa !9
  call void @freeNode(ptr noundef %3)
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  br label %24

24:                                               ; preds = %16, %10
  %25 = load ptr, ptr %2, align 8, !tbaa !5
  %26 = load ptr, ptr %25, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.TreeNode, ptr %26, i32 0, i32 2
  %28 = load ptr, ptr %27, align 8, !tbaa !12
  %29 = icmp ne ptr %28, null
  br i1 %29, label %30, label %38

30:                                               ; preds = %24
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %31 = load ptr, ptr %2, align 8, !tbaa !5
  %32 = load ptr, ptr %31, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.TreeNode, ptr %32, i32 0, i32 2
  %34 = load ptr, ptr %33, align 8, !tbaa !12
  store ptr %34, ptr %4, align 8, !tbaa !5
  %35 = load ptr, ptr %2, align 8, !tbaa !5
  %36 = load ptr, ptr %35, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.TreeNode, ptr %36, i32 0, i32 2
  store ptr null, ptr %37, align 8, !tbaa !12
  call void @freeNode(ptr noundef %4)
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %38

38:                                               ; preds = %30, %24
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %39 = load ptr, ptr %2, align 8, !tbaa !5
  %40 = load ptr, ptr %39, align 8, !tbaa !5
  store ptr %40, ptr %5, align 8, !tbaa !5
  %41 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr null, ptr %41, align 8, !tbaa !5
  %42 = load ptr, ptr %5, align 8, !tbaa !5
  call void @free(ptr noundef %42) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  br label %43

43:                                               ; preds = %38, %9
  ret void
}

; Function Attrs: nounwind
declare void @free(ptr noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 = { 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/C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"TreeNode", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, 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"

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local void @freeNode(ptr nocapture noundef %0) local_unnamed_addr #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = load ptr, ptr %0, align 8, !tbaa !5
  %5 = icmp eq ptr %4, null
  br i1 %5, label %17, label %6

6:                                                ; preds = %1
  %7 = getelementptr inbounds i8, ptr %4, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !9
  %.not = icmp eq ptr %8, null
  br i1 %.not, label %10, label %9

9:                                                ; preds = %6
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  store ptr %8, ptr %2, align 8, !tbaa !5
  store ptr null, ptr %7, align 8, !tbaa !9
  call void @freeNode(ptr noundef nonnull %2)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  %.pre = load ptr, ptr %0, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %9, %6
  %11 = phi ptr [ %.pre, %9 ], [ %4, %6 ]
  %12 = getelementptr inbounds i8, ptr %11, i64 16
  %13 = load ptr, ptr %12, align 8, !tbaa !12
  %.not10 = icmp eq ptr %13, null
  br i1 %.not10, label %15, label %14

14:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  store ptr %13, ptr %3, align 8, !tbaa !5
  store ptr null, ptr %12, align 8, !tbaa !12
  call void @freeNode(ptr noundef nonnull %3)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  %.pre11 = load ptr, ptr %0, align 8, !tbaa !5
  br label %15

15:                                               ; preds = %14, %10
  %16 = phi ptr [ %.pre11, %14 ], [ %11, %10 ]
  store ptr null, ptr %0, align 8, !tbaa !5
  tail call void @free(ptr noundef %16) #3
  br label %17

17:                                               ; preds = %1, %15
  ret void
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #2

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, 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 #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, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"TreeNode", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 16}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass