; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 15. Binary Search Tree/BST_Traversals_MaxMin_Nodes.ll (Z16delete2childnodeP3BST)

; 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.BST = 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: mustprogress nounwind uwtable
declare dso_local void @_Z10deleteleafP3BST(ptr noundef) #1

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z16delete2childnodeP3BST(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %4 = load ptr, ptr %2, align 8, !tbaa !5
  %5 = getelementptr inbounds %struct.BST, ptr %4, i32 0, i32 2
  %6 = load ptr, ptr %5, align 8, !tbaa !9
  store ptr %6, ptr %3, align 8, !tbaa !5
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = icmp ne ptr %7, null
  br i1 %8, label %9, label %34

9:                                                ; preds = %1
  br label %10

10:                                               ; preds = %15, %9
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.BST, ptr %11, i32 0, i32 1
  %13 = load ptr, ptr %12, align 8, !tbaa !12
  %14 = icmp ne ptr %13, null
  br i1 %14, label %15, label %19

15:                                               ; preds = %10
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.BST, ptr %16, i32 0, i32 1
  %18 = load ptr, ptr %17, align 8, !tbaa !12
  store ptr %18, ptr %3, align 8, !tbaa !5
  br label %10, !llvm.loop !13

19:                                               ; preds = %10
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.BST, ptr %20, i32 0, i32 0
  %22 = load i32, ptr %21, align 8, !tbaa !15
  %23 = load ptr, ptr %2, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.BST, ptr %23, i32 0, i32 0
  store i32 %22, ptr %24, align 8, !tbaa !15
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.BST, ptr %25, i32 0, i32 2
  %27 = load ptr, ptr %26, align 8, !tbaa !9
  %28 = icmp eq ptr %27, null
  br i1 %28, label %29, label %31

29:                                               ; preds = %19
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  call void @_Z10deleteleafP3BST(ptr noundef %30)
  br label %33

31:                                               ; preds = %19
  %32 = load ptr, ptr %3, align 8, !tbaa !5
  call void @_Z16delete1childnodeP3BST(ptr noundef %32)
  br label %33

33:                                               ; preds = %31, %29
  br label %34

34:                                               ; preds = %33, %1
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z16delete1childnodeP3BST(ptr noundef) #1

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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++ TBAA"}
!9 = !{!10, !6, i64 16}
!10 = !{!"_ZTS3BST", !11, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!10, !11, i64 0}


; 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 nounwind uwtable
declare dso_local void @_Z10deleteleafP3BST(ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z16delete2childnodeP3BST(ptr nocapture noundef %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 16
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %.not = icmp eq ptr %3, null
  br i1 %.not, label %13, label %.preheader

.preheader:                                       ; preds = %1, %.preheader
  %.0 = phi ptr [ %5, %.preheader ], [ %3, %1 ]
  %4 = getelementptr inbounds i8, ptr %.0, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !11
  %.not11 = icmp eq ptr %5, null
  br i1 %.not11, label %6, label %.preheader, !llvm.loop !12

6:                                                ; preds = %.preheader
  %7 = load i32, ptr %.0, align 8, !tbaa !14
  store i32 %7, ptr %0, align 8, !tbaa !14
  %8 = getelementptr inbounds i8, ptr %.0, i64 16
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = icmp eq ptr %9, null
  br i1 %10, label %11, label %12

11:                                               ; preds = %6
  tail call void @_Z10deleteleafP3BST(ptr noundef nonnull %.0)
  br label %13

12:                                               ; preds = %6
  tail call void @_Z16delete1childnodeP3BST(ptr noundef nonnull %.0)
  br label %13

13:                                               ; preds = %11, %12, %1
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z16delete1childnodeP3BST(ptr noundef) local_unnamed_addr #0

attributes #0 = { 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" }

!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 = !{!"_ZTS3BST", !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++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 8}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!6, !7, i64 0}


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