; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/ds/avl_tree.ll (Z18find_critical_nodeP4Node)

; 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, i32, 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 nounwind uwtable
declare dso_local noundef i32 @_Z19find_balance_factorP4Node(ptr noundef) #1

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_Z18find_critical_nodeP4Node(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store ptr null, ptr %3, align 8, !tbaa !5
  br label %4

4:                                                ; preds = %36, %1
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = icmp ne ptr %5, null
  br i1 %6, label %7, label %37

7:                                                ; preds = %4
  %8 = load ptr, ptr %2, align 8, !tbaa !5
  %9 = call noundef i32 @_Z19find_balance_factorP4Node(ptr noundef %8)
  %10 = load ptr, ptr %2, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.Node, ptr %10, i32 0, i32 3
  store i32 %9, ptr %11, align 4, !tbaa !9
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.Node, ptr %12, i32 0, i32 3
  %14 = load i32, ptr %13, align 4, !tbaa !9
  %15 = icmp sgt i32 %14, 1
  br i1 %15, label %16, label %21

16:                                               ; preds = %7
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %17, ptr %3, align 8, !tbaa !5
  %18 = load ptr, ptr %2, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.Node, ptr %18, i32 0, i32 0
  %20 = load ptr, ptr %19, align 8, !tbaa !12
  store ptr %20, ptr %2, align 8, !tbaa !5
  br label %36

21:                                               ; preds = %7
  %22 = load ptr, ptr %2, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.Node, ptr %22, i32 0, i32 3
  %24 = load i32, ptr %23, align 4, !tbaa !9
  %25 = icmp slt i32 %24, -1
  br i1 %25, label %26, label %31

26:                                               ; preds = %21
  %27 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %27, ptr %3, align 8, !tbaa !5
  %28 = load ptr, ptr %2, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.Node, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !13
  store ptr %30, ptr %2, align 8, !tbaa !5
  br label %35

31:                                               ; preds = %21
  %32 = load ptr, ptr %2, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.Node, ptr %32, i32 0, i32 0
  %34 = load ptr, ptr %33, align 8, !tbaa !12
  store ptr %34, ptr %2, align 8, !tbaa !5
  br label %35

35:                                               ; preds = %31, %26
  br label %36

36:                                               ; preds = %35, %16
  br label %4, !llvm.loop !14

37:                                               ; preds = %4
  %38 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret ptr %38
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 #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, !11, i64 20}
!10 = !{!"_ZTS4Node", !6, i64 0, !6, i64 8, !11, i64 16, !11, i64 20, !11, i64 24}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 0}
!13 = !{!10, !6, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


; 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 nounwind uwtable
declare dso_local noundef i32 @_Z19find_balance_factorP4Node(ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_Z18find_critical_nodeP4Node(ptr noundef %0) local_unnamed_addr #0 {
  %.not15 = icmp eq ptr %0, null
  br i1 %.not15, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.017 = phi ptr [ %.1, %.lr.ph ], [ null, %1 ]
  %.01116 = phi ptr [ %.112, %.lr.ph ], [ %0, %1 ]
  %2 = tail call noundef i32 @_Z19find_balance_factorP4Node(ptr noundef nonnull %.01116)
  %3 = getelementptr inbounds i8, ptr %.01116, i64 20
  store i32 %2, ptr %3, align 4, !tbaa !5
  %4 = icmp sgt i32 %2, 1
  %5 = icmp slt i32 %2, -1
  %spec.select.idx = select i1 %5, i64 8, i64 0
  %.112.in.idx = select i1 %4, i64 0, i64 %spec.select.idx
  %.112.in = getelementptr inbounds i8, ptr %.01116, i64 %.112.in.idx
  %6 = add i32 %2, -2
  %7 = icmp ult i32 %6, -3
  %.1 = select i1 %7, ptr %.01116, ptr %.017
  %.112 = load ptr, ptr %.112.in, align 8, !tbaa !11
  %.not = icmp eq ptr %.112, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.0.lcssa = phi ptr [ null, %1 ], [ %.1, %.lr.ph ]
  ret ptr %.0.lcssa
}

attributes #0 = { mustprogress 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, !10, i64 20}
!6 = !{!"_ZTS4Node", !7, i64 0, !7, i64 8, !10, i64 16, !10, i64 20, !10, i64 24}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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