; LLVM IR from UtkarshPathrabe/Competitive-Coding :: Model Algorithms/Binary Tree/Connect Nodes at Same Level.ll (Z12connectRecurP4node)

; 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, ptr }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z12connectRecurP4node(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %4 = icmp eq ptr %3, null
  br i1 %4, label %5, label %6

5:                                                ; preds = %1
  br label %49

6:                                                ; preds = %1
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %8 = getelementptr inbounds %struct.node, ptr %7, i32 0, i32 1
  %9 = load ptr, ptr %8, align 8, !tbaa !9
  %10 = icmp ne ptr %9, null
  br i1 %10, label %11, label %19

11:                                               ; preds = %6
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.node, ptr %12, i32 0, i32 2
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  %15 = load ptr, ptr %2, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.node, ptr %15, i32 0, i32 1
  %17 = load ptr, ptr %16, align 8, !tbaa !9
  %18 = getelementptr inbounds %struct.node, ptr %17, i32 0, i32 3
  store ptr %14, ptr %18, align 8, !tbaa !13
  br label %19

19:                                               ; preds = %11, %6
  %20 = load ptr, ptr %2, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.node, ptr %20, i32 0, i32 2
  %22 = load ptr, ptr %21, align 8, !tbaa !12
  %23 = icmp ne ptr %22, null
  br i1 %23, label %24, label %42

24:                                               ; preds = %19
  %25 = load ptr, ptr %2, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.node, ptr %25, i32 0, i32 3
  %27 = load ptr, ptr %26, align 8, !tbaa !13
  %28 = icmp ne ptr %27, null
  br i1 %28, label %29, label %35

29:                                               ; preds = %24
  %30 = load ptr, ptr %2, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.node, ptr %30, i32 0, i32 3
  %32 = load ptr, ptr %31, align 8, !tbaa !13
  %33 = getelementptr inbounds %struct.node, ptr %32, i32 0, i32 1
  %34 = load ptr, ptr %33, align 8, !tbaa !9
  br label %36

35:                                               ; preds = %24
  br label %36

36:                                               ; preds = %35, %29
  %37 = phi ptr [ %34, %29 ], [ null, %35 ]
  %38 = load ptr, ptr %2, align 8, !tbaa !5
  %39 = getelementptr inbounds %struct.node, ptr %38, i32 0, i32 2
  %40 = load ptr, ptr %39, align 8, !tbaa !12
  %41 = getelementptr inbounds %struct.node, ptr %40, i32 0, i32 3
  store ptr %37, ptr %41, align 8, !tbaa !13
  br label %42

42:                                               ; preds = %36, %19
  %43 = load ptr, ptr %2, align 8, !tbaa !5
  %44 = getelementptr inbounds %struct.node, ptr %43, i32 0, i32 1
  %45 = load ptr, ptr %44, align 8, !tbaa !9
  call void @_Z12connectRecurP4node(ptr noundef %45)
  %46 = load ptr, ptr %2, align 8, !tbaa !5
  %47 = getelementptr inbounds %struct.node, ptr %46, i32 0, i32 2
  %48 = load ptr, ptr %47, align 8, !tbaa !12
  call void @_Z12connectRecurP4node(ptr noundef %48)
  br label %49

49:                                               ; preds = %42, %5
  ret void
}

attributes #0 = { mustprogress 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++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"_ZTS4node", !11, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 16}
!13 = !{!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: mustprogress nofree nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @_Z12connectRecurP4node(ptr noundef readonly %0) local_unnamed_addr #0 {
  %2 = icmp eq ptr %0, null
  br i1 %2, label %tailrecurse._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %tailrecurse
  %.tr14 = phi ptr [ %17, %tailrecurse ], [ %0, %1 ]
  %3 = getelementptr inbounds i8, ptr %.tr14, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %.not = icmp eq ptr %4, null
  %.phi.trans.insert = getelementptr inbounds i8, ptr %.tr14, i64 16
  %.pre = load ptr, ptr %.phi.trans.insert, align 8, !tbaa !11
  br i1 %.not, label %.lr.ph._crit_edge, label %5

5:                                                ; preds = %.lr.ph
  %6 = getelementptr inbounds i8, ptr %4, i64 24
  store ptr %.pre, ptr %6, align 8, !tbaa !12
  br label %.lr.ph._crit_edge

.lr.ph._crit_edge:                                ; preds = %.lr.ph, %5
  %7 = getelementptr inbounds i8, ptr %.tr14, i64 16
  %.not12 = icmp eq ptr %.pre, null
  br i1 %.not12, label %tailrecurse, label %8

8:                                                ; preds = %.lr.ph._crit_edge
  %9 = getelementptr inbounds i8, ptr %.tr14, i64 24
  %10 = load ptr, ptr %9, align 8, !tbaa !12
  %.not13 = icmp eq ptr %10, null
  br i1 %.not13, label %14, label %11

11:                                               ; preds = %8
  %12 = getelementptr inbounds i8, ptr %10, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %8, %11
  %15 = phi ptr [ %13, %11 ], [ null, %8 ]
  %16 = getelementptr inbounds i8, ptr %.pre, i64 24
  store ptr %15, ptr %16, align 8, !tbaa !12
  br label %tailrecurse

tailrecurse:                                      ; preds = %14, %.lr.ph._crit_edge
  tail call void @_Z12connectRecurP4node(ptr noundef %4)
  %17 = load ptr, ptr %7, align 8, !tbaa !11
  %18 = icmp eq ptr %17, null
  br i1 %18, label %tailrecurse._crit_edge, label %.lr.ph

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %1
  ret void
}

attributes #0 = { mustprogress 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 8}
!6 = !{!"_ZTS4node", !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 16}
!12 = !{!6, !10, i64 24}


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