; LLVM IR from JessonYue/LeetCodeLearning :: Array/linchuanxin/homework/homework_0714_0718/homework3 (bst)

; 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.node = type { i32, ptr, ptr }

@root = external dso_local global ptr, align 8

; Function Attrs: nounwind uwtable
declare dso_local i32 @keyComp(i32 noundef, i32 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local ptr @treeSearch(i32 noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %7 = load ptr, ptr @root, align 8, !tbaa !9
  store ptr %7, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  br label %8

8:                                                ; preds = %33, %1
  %9 = load ptr, ptr %4, align 8, !tbaa !9
  %10 = icmp ne ptr %9, null
  br i1 %10, label %11, label %34

11:                                               ; preds = %8
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = load ptr, ptr %4, align 8, !tbaa !9
  %14 = getelementptr inbounds %struct.node, ptr %13, i32 0, i32 0
  %15 = load i32, ptr %14, align 8, !tbaa !11
  %16 = call i32 @keyComp(i32 noundef %12, i32 noundef %15)
  store i32 %16, ptr %5, align 4, !tbaa !5
  %17 = load i32, ptr %5, align 4, !tbaa !5
  %18 = icmp eq i32 %17, 1
  br i1 %18, label %19, label %21

19:                                               ; preds = %11
  %20 = load ptr, ptr %4, align 8, !tbaa !9
  store ptr %20, ptr %2, align 8
  store i32 1, ptr %6, align 4
  br label %35

21:                                               ; preds = %11
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = icmp eq i32 %22, 2
  br i1 %23, label %24, label %28

24:                                               ; preds = %21
  %25 = load ptr, ptr %4, align 8, !tbaa !9
  %26 = getelementptr inbounds %struct.node, ptr %25, i32 0, i32 2
  %27 = load ptr, ptr %26, align 8, !tbaa !13
  store ptr %27, ptr %4, align 8, !tbaa !9
  br label %32

28:                                               ; preds = %21
  %29 = load ptr, ptr %4, align 8, !tbaa !9
  %30 = getelementptr inbounds %struct.node, ptr %29, i32 0, i32 1
  %31 = load ptr, ptr %30, align 8, !tbaa !14
  store ptr %31, ptr %4, align 8, !tbaa !9
  br label %32

32:                                               ; preds = %28, %24
  br label %33

33:                                               ; preds = %32
  br label %8, !llvm.loop !15

34:                                               ; preds = %8
  store ptr null, ptr %2, align 8
  store i32 1, ptr %6, align 4
  br label %35

35:                                               ; preds = %34, %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %36 = load ptr, ptr %2, align 8
  ret ptr %36
}

; 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

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 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"node", !6, i64 0, !10, i64 8, !10, i64 16}
!13 = !{!12, !10, i64 16}
!14 = !{!12, !10, i64 8}
!15 = distinct !{!15, !16}
!16 = !{!"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"

@root = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nounwind uwtable
declare dso_local i32 @keyComp(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef ptr @treeSearch(i32 noundef %0) local_unnamed_addr #0 {
  %.0810 = load ptr, ptr @root, align 8, !tbaa !5
  %.not11 = icmp eq ptr %.0810, null
  br i1 %.not11, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %5
  %.0812 = phi ptr [ %.08, %5 ], [ %.0810, %1 ]
  %2 = load i32, ptr %.0812, align 8, !tbaa !9
  %3 = tail call i32 @keyComp(i32 noundef %0, i32 noundef %2)
  switch i32 %3, label %4 [
    i32 1, label %._crit_edge
    i32 2, label %5
  ]

4:                                                ; preds = %.lr.ph
  br label %5

5:                                                ; preds = %.lr.ph, %4
  %.sink = phi i64 [ 8, %4 ], [ 16, %.lr.ph ]
  %6 = getelementptr inbounds i8, ptr %.0812, i64 %.sink
  %.08 = load ptr, ptr %6, align 8, !tbaa !5
  %.not = icmp eq ptr %.08, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12

._crit_edge:                                      ; preds = %.lr.ph, %5, %1
  %.08.lcssa = phi ptr [ null, %1 ], [ null, %5 ], [ %.0812, %.lr.ph ]
  ret ptr %.08.lcssa
}

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" }

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


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