; LLVM IR from JessonYue/LeetCodeLearning :: Array/caiweixiong/c (homework_029)

; 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 }

@pre = external dso_local global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local void @convertBiNode_(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  %6 = icmp ne ptr %5, null
  br i1 %6, label %8, label %7

7:                                                ; preds = %2
  br label %29

8:                                                ; preds = %2
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.TreeNode, ptr %9, i32 0, i32 2
  %11 = load ptr, ptr %10, align 8, !tbaa !9
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  call void @convertBiNode_(ptr noundef %11, ptr noundef %12)
  %13 = load ptr, ptr @pre, align 8, !tbaa !5
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.TreeNode, ptr %14, i32 0, i32 2
  store ptr %13, ptr %15, align 8, !tbaa !9
  %16 = load ptr, ptr @pre, align 8, !tbaa !5
  %17 = icmp ne ptr %16, null
  br i1 %17, label %18, label %21

18:                                               ; preds = %8
  %19 = load ptr, ptr @pre, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.TreeNode, ptr %19, i32 0, i32 1
  store ptr null, ptr %20, align 8, !tbaa !12
  br label %21

21:                                               ; preds = %18, %8
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %22, ptr @pre, align 8, !tbaa !5
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %23, ptr %24, align 8, !tbaa !5
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.TreeNode, ptr %25, i32 0, i32 1
  %27 = load ptr, ptr %26, align 8, !tbaa !12
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  call void @convertBiNode_(ptr noundef %27, ptr noundef %28)
  br label %29

29:                                               ; preds = %21, %7
  ret void
}

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


; 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"

@pre = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nofree nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @convertBiNode_(ptr noundef %0, ptr nocapture noundef writeonly %1) local_unnamed_addr #0 {
  %.not12 = icmp eq ptr %0, null
  br i1 %.not12, label %tailrecurse._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %tailrecurse
  %.tr13 = phi ptr [ %9, %tailrecurse ], [ %0, %2 ]
  %3 = getelementptr inbounds i8, ptr %.tr13, i64 16
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  tail call void @convertBiNode_(ptr noundef %4, ptr noundef %1)
  %5 = load ptr, ptr @pre, align 8, !tbaa !11
  store ptr %5, ptr %3, align 8, !tbaa !5
  %.not10 = icmp eq ptr %5, null
  br i1 %.not10, label %tailrecurse, label %6

6:                                                ; preds = %.lr.ph
  %7 = getelementptr inbounds i8, ptr %5, i64 8
  store ptr null, ptr %7, align 8, !tbaa !12
  br label %tailrecurse

tailrecurse:                                      ; preds = %6, %.lr.ph
  store ptr %.tr13, ptr @pre, align 8, !tbaa !11
  store ptr %.tr13, ptr %1, align 8, !tbaa !11
  %8 = getelementptr inbounds i8, ptr %.tr13, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !12
  %.not = icmp eq ptr %9, null
  br i1 %.not, label %tailrecurse._crit_edge, label %.lr.ph

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %2
  ret void
}

attributes #0 = { nofree 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 16}
!6 = !{!"TreeNode", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!10, !10, i64 0}
!12 = !{!6, !10, i64 8}


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