; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/ds/ancestors_of_given_number_BST.ll (Z12level_assignP3BSTi)

; 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, i32, i32, ptr, ptr }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z12level_assignP3BSTi(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %5 = load i32, ptr %4, align 4, !tbaa !9
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.BST, ptr %6, i32 0, i32 2
  store i32 %5, ptr %7, align 8, !tbaa !11
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.BST, ptr %8, i32 0, i32 3
  %10 = load ptr, ptr %9, align 8, !tbaa !13
  %11 = icmp ne ptr %10, null
  br i1 %11, label %12, label %18

12:                                               ; preds = %2
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.BST, ptr %13, i32 0, i32 3
  %15 = load ptr, ptr %14, align 8, !tbaa !13
  %16 = load i32, ptr %4, align 4, !tbaa !9
  %17 = add nsw i32 %16, 1
  call void @_Z12level_assignP3BSTi(ptr noundef %15, i32 noundef %17)
  br label %18

18:                                               ; preds = %12, %2
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.BST, ptr %19, i32 0, i32 4
  %21 = load ptr, ptr %20, align 8, !tbaa !14
  %22 = icmp ne ptr %21, null
  br i1 %22, label %23, label %29

23:                                               ; preds = %18
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.BST, ptr %24, i32 0, i32 4
  %26 = load ptr, ptr %25, align 8, !tbaa !14
  %27 = load i32, ptr %4, align 4, !tbaa !9
  %28 = add nsw i32 %27, 1
  call void @_Z12level_assignP3BSTi(ptr noundef %26, i32 noundef %28)
  br label %29

29:                                               ; preds = %23, %18
  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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 8}
!12 = !{!"_ZTS3BST", !10, i64 0, !10, i64 4, !10, i64 8, !6, i64 16, !6, i64 24}
!13 = !{!12, !6, i64 16}
!14 = !{!12, !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 @_Z12level_assignP3BSTi(ptr nocapture noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  br label %tailrecurse

tailrecurse:                                      ; preds = %tailrecurse._crit_edge, %2
  %.tr = phi ptr [ %0, %2 ], [ %8, %tailrecurse._crit_edge ]
  %.tr9 = phi i32 [ %1, %2 ], [ %.pre, %tailrecurse._crit_edge ]
  %3 = getelementptr inbounds i8, ptr %.tr, i64 8
  store i32 %.tr9, ptr %3, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %.tr, i64 16
  %5 = load ptr, ptr %4, align 8, !tbaa !11
  %.not = icmp eq ptr %5, null
  %.pre = add nsw i32 %.tr9, 1
  br i1 %.not, label %tailrecurse._crit_edge, label %6

6:                                                ; preds = %tailrecurse
  tail call void @_Z12level_assignP3BSTi(ptr noundef nonnull %5, i32 noundef %.pre)
  br label %tailrecurse._crit_edge

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %6
  %7 = getelementptr inbounds i8, ptr %.tr, i64 24
  %8 = load ptr, ptr %7, align 8, !tbaa !12
  %.not8 = icmp eq ptr %8, null
  br i1 %.not8, label %9, label %tailrecurse

9:                                                ; preds = %tailrecurse._crit_edge
  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, !7, i64 8}
!6 = !{!"_ZTS3BST", !7, i64 0, !7, i64 4, !7, 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,LoopRotatePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass