; LLVM IR from xuxping/codelife :: algorthms/tree (lowestCommonAncestor)

; 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, 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 ptr @lowestCommonAncestor(ptr noundef %0, ptr noundef %1, ptr noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store ptr %2, ptr %7, align 8, !tbaa !5
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = icmp eq ptr %11, null
  br i1 %12, label %21, label %13

13:                                               ; preds = %3
  %14 = load ptr, ptr %6, align 8, !tbaa !5
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = icmp eq ptr %14, %15
  br i1 %16, label %21, label %17

17:                                               ; preds = %13
  %18 = load ptr, ptr %7, align 8, !tbaa !5
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = icmp eq ptr %18, %19
  br i1 %20, label %21, label %23

21:                                               ; preds = %17, %13, %3
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %22, ptr %4, align 8
  br label %48

23:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.TreeNode, ptr %24, i32 0, i32 2
  %26 = load ptr, ptr %25, align 8, !tbaa !9
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  %28 = load ptr, ptr %7, align 8, !tbaa !5
  %29 = call ptr @lowestCommonAncestor(ptr noundef %26, ptr noundef %27, ptr noundef %28)
  store ptr %29, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  %30 = load ptr, ptr %5, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.TreeNode, ptr %30, i32 0, i32 3
  %32 = load ptr, ptr %31, align 8, !tbaa !12
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  %34 = load ptr, ptr %7, align 8, !tbaa !5
  %35 = call ptr @lowestCommonAncestor(ptr noundef %32, ptr noundef %33, ptr noundef %34)
  store ptr %35, ptr %9, align 8, !tbaa !5
  %36 = load ptr, ptr %8, align 8, !tbaa !5
  %37 = icmp eq ptr %36, null
  br i1 %37, label %38, label %40

38:                                               ; preds = %23
  %39 = load ptr, ptr %9, align 8, !tbaa !5
  store ptr %39, ptr %4, align 8
  store i32 1, ptr %10, align 4
  br label %47

40:                                               ; preds = %23
  %41 = load ptr, ptr %9, align 8, !tbaa !5
  %42 = icmp eq ptr %41, null
  br i1 %42, label %43, label %45

43:                                               ; preds = %40
  %44 = load ptr, ptr %8, align 8, !tbaa !5
  store ptr %44, ptr %4, align 8
  store i32 1, ptr %10, align 4
  br label %47

45:                                               ; preds = %40
  %46 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %46, ptr %4, align 8
  store i32 1, ptr %10, align 4
  br label %47

47:                                               ; preds = %45, %43, %38
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  br label %48

48:                                               ; preds = %47, %21
  %49 = load ptr, ptr %4, align 8
  ret ptr %49
}

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 }

!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 16}
!10 = !{!"TreeNode", !11, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 24}


; 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: nofree nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local ptr @lowestCommonAncestor(ptr noundef readonly %0, ptr noundef readnone %1, ptr noundef readnone %2) local_unnamed_addr #0 {
  %4 = icmp eq ptr %0, null
  %5 = icmp eq ptr %1, %0
  %or.cond = or i1 %4, %5
  %6 = icmp eq ptr %2, %0
  %or.cond22 = or i1 %or.cond, %6
  br i1 %or.cond22, label %common.ret23, label %7

common.ret23:                                     ; preds = %3, %7
  %common.ret23.op = phi ptr [ %.0, %7 ], [ %0, %3 ]
  ret ptr %common.ret23.op

7:                                                ; preds = %3
  %8 = getelementptr inbounds i8, ptr %0, i64 16
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = tail call ptr @lowestCommonAncestor(ptr noundef %9, ptr noundef %1, ptr noundef %2)
  %11 = getelementptr inbounds i8, ptr %0, i64 24
  %12 = load ptr, ptr %11, align 8, !tbaa !11
  %13 = tail call ptr @lowestCommonAncestor(ptr noundef %12, ptr noundef %1, ptr noundef %2)
  %14 = icmp eq ptr %10, null
  %15 = icmp eq ptr %13, null
  %. = select i1 %15, ptr %10, ptr %0
  %.0 = select i1 %14, ptr %13, ptr %.
  br label %common.ret23
}

attributes #0 = { nofree nosync nounwind memory(read, inaccessiblemem: none) 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, !10, i64 16}
!6 = !{!"TreeNode", !7, i64 0, !10, i64 8, !10, i64 16, !10, i64 24}
!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 24}


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