; LLVM IR from wuzhouhui/leetcode :: 116_popu_next_right (connect)

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

; Function Attrs: nounwind uwtable
define dso_local void @connect(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = icmp ne ptr %5, null
  br i1 %6, label %8, label %7

7:                                                ; preds = %1
  br label %55

8:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.TreeLinkNode, ptr %9, i32 0, i32 3
  store ptr null, ptr %10, align 8, !tbaa !9
  %11 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %11, ptr %4, align 8, !tbaa !5
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.TreeLinkNode, ptr %12, i32 0, i32 1
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  store ptr %14, ptr %2, align 8, !tbaa !5
  br label %15

15:                                               ; preds = %49, %8
  %16 = load ptr, ptr %2, align 8, !tbaa !5
  %17 = icmp ne ptr %16, null
  br i1 %17, label %18, label %54

18:                                               ; preds = %15
  %19 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %19, ptr %3, align 8, !tbaa !5
  br label %20

20:                                               ; preds = %48, %18
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = icmp ne ptr %21, null
  br i1 %22, label %23, label %49

23:                                               ; preds = %20
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.TreeLinkNode, ptr %24, i32 0, i32 2
  %26 = load ptr, ptr %25, align 8, !tbaa !13
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.TreeLinkNode, ptr %27, i32 0, i32 3
  store ptr %26, ptr %28, align 8, !tbaa !9
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.TreeLinkNode, ptr %29, i32 0, i32 3
  %31 = load ptr, ptr %30, align 8, !tbaa !9
  store ptr %31, ptr %3, align 8, !tbaa !5
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.TreeLinkNode, ptr %32, i32 0, i32 3
  %34 = load ptr, ptr %33, align 8, !tbaa !9
  store ptr %34, ptr %4, align 8, !tbaa !5
  %35 = icmp ne ptr %34, null
  br i1 %35, label %36, label %45

36:                                               ; preds = %23
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.TreeLinkNode, ptr %37, i32 0, i32 1
  %39 = load ptr, ptr %38, align 8, !tbaa !12
  %40 = load ptr, ptr %3, align 8, !tbaa !5
  %41 = getelementptr inbounds %struct.TreeLinkNode, ptr %40, i32 0, i32 3
  store ptr %39, ptr %41, align 8, !tbaa !9
  %42 = load ptr, ptr %3, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.TreeLinkNode, ptr %42, i32 0, i32 3
  %44 = load ptr, ptr %43, align 8, !tbaa !9
  store ptr %44, ptr %3, align 8, !tbaa !5
  br label %48

45:                                               ; preds = %23
  %46 = load ptr, ptr %3, align 8, !tbaa !5
  %47 = getelementptr inbounds %struct.TreeLinkNode, ptr %46, i32 0, i32 3
  store ptr null, ptr %47, align 8, !tbaa !9
  br label %48

48:                                               ; preds = %45, %36
  br label %20, !llvm.loop !14

49:                                               ; preds = %20
  %50 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %50, ptr %4, align 8, !tbaa !5
  %51 = load ptr, ptr %2, align 8, !tbaa !5
  %52 = getelementptr inbounds %struct.TreeLinkNode, ptr %51, i32 0, i32 1
  %53 = load ptr, ptr %52, align 8, !tbaa !12
  store ptr %53, ptr %2, align 8, !tbaa !5
  br label %15, !llvm.loop !16

54:                                               ; preds = %15
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  br label %55

55:                                               ; preds = %54, %7
  ret void
}

; 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 24}
!10 = !{!"TreeLinkNode", !11, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = !{!10, !6, i64 16}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = distinct !{!16, !15}


; 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 norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @connect(ptr noundef %0) local_unnamed_addr #0 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %.loopexit25, label %2

2:                                                ; preds = %1
  %3 = getelementptr inbounds i8, ptr %0, i64 24
  store ptr null, ptr %3, align 8, !tbaa !5
  %.019.in28 = getelementptr inbounds i8, ptr %0, i64 8
  %.01929 = load ptr, ptr %.019.in28, align 8, !tbaa !11
  %.not2230 = icmp eq ptr %.01929, null
  br i1 %.not2230, label %.loopexit25, label %.preheader

.loopexit:                                        ; preds = %.lr.ph, %.preheader
  %.lcssa = phi ptr [ %6, %.preheader ], [ %16, %.lr.ph ]
  %4 = getelementptr inbounds i8, ptr %.lcssa, i64 24
  store ptr null, ptr %4, align 8
  %.019.in = getelementptr inbounds i8, ptr %.01932, i64 8
  %.019 = load ptr, ptr %.019.in, align 8, !tbaa !11
  %.not22 = icmp eq ptr %.019, null
  br i1 %.not22, label %.loopexit25, label %.preheader, !llvm.loop !12

.preheader:                                       ; preds = %2, %.loopexit
  %.01932 = phi ptr [ %.019, %.loopexit ], [ %.01929, %2 ]
  %.031 = phi ptr [ %.01932, %.loopexit ], [ %0, %2 ]
  %5 = getelementptr inbounds i8, ptr %.031, i64 16
  %6 = load ptr, ptr %5, align 8, !tbaa !14
  %7 = getelementptr inbounds i8, ptr %.01932, i64 24
  store ptr %6, ptr %7, align 8, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %.031, i64 24
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %.not2435 = icmp eq ptr %9, null
  br i1 %.not2435, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %10 = phi ptr [ %19, %.lr.ph ], [ %9, %.preheader ]
  %11 = phi ptr [ %16, %.lr.ph ], [ %6, %.preheader ]
  %12 = getelementptr inbounds i8, ptr %10, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !11
  %14 = getelementptr inbounds i8, ptr %11, i64 24
  store ptr %13, ptr %14, align 8
  %15 = getelementptr inbounds i8, ptr %10, i64 16
  %16 = load ptr, ptr %15, align 8, !tbaa !14
  %17 = getelementptr inbounds i8, ptr %13, i64 24
  store ptr %16, ptr %17, align 8, !tbaa !5
  %18 = getelementptr inbounds i8, ptr %10, i64 24
  %19 = load ptr, ptr %18, align 8, !tbaa !5
  %.not24 = icmp eq ptr %19, null
  br i1 %.not24, label %.loopexit, label %.lr.ph, !llvm.loop !15

.loopexit25:                                      ; preds = %.loopexit, %2, %1
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, 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 24}
!6 = !{!"TreeLinkNode", !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 8}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!6, !10, i64 16}
!15 = distinct !{!15, !13}


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