; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 15. Binary Search Tree/distance_between_2nodes.ll (Z9findlevelP4Nodeii)

; 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 { ptr, ptr, i32 }

; 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 uwtable
define dso_local noundef i32 @_Z9findlevelP4Nodeii(ptr noundef %0, i32 noundef %1, i32 noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  %9 = load ptr, ptr %5, align 8, !tbaa !5
  %10 = icmp eq ptr %9, null
  br i1 %10, label %11, label %12

11:                                               ; preds = %3
  store i32 -1, ptr %4, align 4
  br label %42

12:                                               ; preds = %3
  %13 = load ptr, ptr %5, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.Node, ptr %13, i32 0, i32 2
  %15 = load i32, ptr %14, align 8, !tbaa !11
  %16 = load i32, ptr %6, align 4, !tbaa !9
  %17 = icmp eq i32 %15, %16
  br i1 %17, label %18, label %20

18:                                               ; preds = %12
  %19 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %19, ptr %4, align 4
  br label %42

20:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.Node, ptr %21, i32 0, i32 0
  %23 = load ptr, ptr %22, align 8, !tbaa !13
  %24 = load i32, ptr %6, align 4, !tbaa !9
  %25 = load i32, ptr %7, align 4, !tbaa !9
  %26 = add nsw i32 %25, 1
  %27 = call noundef i32 @_Z9findlevelP4Nodeii(ptr noundef %23, i32 noundef %24, i32 noundef %26)
  store i32 %27, ptr %8, align 4, !tbaa !9
  %28 = load i32, ptr %8, align 4, !tbaa !9
  %29 = icmp ne i32 %28, -1
  br i1 %29, label %30, label %32

30:                                               ; preds = %20
  %31 = load i32, ptr %8, align 4, !tbaa !9
  br label %40

32:                                               ; preds = %20
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.Node, ptr %33, i32 0, i32 1
  %35 = load ptr, ptr %34, align 8, !tbaa !14
  %36 = load i32, ptr %6, align 4, !tbaa !9
  %37 = load i32, ptr %7, align 4, !tbaa !9
  %38 = add nsw i32 %37, 1
  %39 = call noundef i32 @_Z9findlevelP4Nodeii(ptr noundef %35, i32 noundef %36, i32 noundef %38)
  br label %40

40:                                               ; preds = %32, %30
  %41 = phi i32 [ %31, %30 ], [ %39, %32 ]
  store i32 %41, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %42

42:                                               ; preds = %40, %18, %11
  %43 = load i32, ptr %4, align 4
  ret i32 %43
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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" }
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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 16}
!12 = !{!"_ZTS4Node", !6, i64 0, !6, i64 8, !10, i64 16}
!13 = !{!12, !6, i64 0}
!14 = !{!12, !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"

; Function Attrs: mustprogress nofree nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z9findlevelP4Nodeii(ptr noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq ptr %0, null
  br i1 %4, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3, %tailrecurse
  %.tr1618 = phi i32 [ %10, %tailrecurse ], [ %2, %3 ]
  %.tr17 = phi ptr [ %13, %tailrecurse ], [ %0, %3 ]
  %5 = getelementptr inbounds i8, ptr %.tr17, i64 16
  %6 = load i32, ptr %5, align 8, !tbaa !5
  %7 = icmp eq i32 %6, %1
  br i1 %7, label %._crit_edge, label %8

8:                                                ; preds = %.lr.ph
  %9 = load ptr, ptr %.tr17, align 8, !tbaa !11
  %10 = add nsw i32 %.tr1618, 1
  %11 = tail call noundef i32 @_Z9findlevelP4Nodeii(ptr noundef %9, i32 noundef %1, i32 noundef %10)
  %.not = icmp eq i32 %11, -1
  br i1 %.not, label %tailrecurse, label %._crit_edge

tailrecurse:                                      ; preds = %8
  %12 = getelementptr inbounds i8, ptr %.tr17, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !12
  %14 = icmp eq ptr %13, null
  br i1 %14, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %tailrecurse, %.lr.ph, %8, %3
  %.0 = phi i32 [ -1, %3 ], [ %11, %8 ], [ %.tr1618, %.lr.ph ], [ -1, %tailrecurse ]
  ret i32 %.0
}

attributes #0 = { mustprogress nofree nosync nounwind willreturn memory(read, 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 = !{!"_ZTS4Node", !7, i64 0, !7, i64 8, !10, i64 16}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = !{!6, !7, i64 8}


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