; LLVM IR from AlgoGenesis/C :: Binary Tree Algorithms/The Nearest Common Ancestor of a BST (program)

; 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 }

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

10:                                               ; preds = %3
  store ptr null, ptr %4, align 8
  br label %51

11:                                               ; preds = %3
  %12 = load ptr, ptr %6, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.Node, ptr %12, i32 0, i32 0
  %14 = load i32, ptr %13, align 8, !tbaa !9
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.Node, ptr %15, i32 0, i32 0
  %17 = load i32, ptr %16, align 8, !tbaa !9
  %18 = sub nsw i32 %14, %17
  %19 = load ptr, ptr %7, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.Node, ptr %19, i32 0, i32 0
  %21 = load i32, ptr %20, align 8, !tbaa !9
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.Node, ptr %22, i32 0, i32 0
  %24 = load i32, ptr %23, align 8, !tbaa !9
  %25 = sub nsw i32 %21, %24
  %26 = mul nsw i32 %18, %25
  %27 = icmp sgt i32 %26, 0
  br i1 %27, label %28, label %49

28:                                               ; preds = %11
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.Node, ptr %29, i32 0, i32 0
  %31 = load i32, ptr %30, align 8, !tbaa !9
  %32 = load ptr, ptr %6, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.Node, ptr %32, i32 0, i32 0
  %34 = load i32, ptr %33, align 8, !tbaa !9
  %35 = icmp sgt i32 %31, %34
  br i1 %35, label %36, label %40

36:                                               ; preds = %28
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.Node, ptr %37, i32 0, i32 1
  %39 = load ptr, ptr %38, align 8, !tbaa !12
  br label %44

40:                                               ; preds = %28
  %41 = load ptr, ptr %5, align 8, !tbaa !5
  %42 = getelementptr inbounds %struct.Node, ptr %41, i32 0, i32 2
  %43 = load ptr, ptr %42, align 8, !tbaa !13
  br label %44

44:                                               ; preds = %40, %36
  %45 = phi ptr [ %39, %36 ], [ %43, %40 ]
  %46 = load ptr, ptr %6, align 8, !tbaa !5
  %47 = load ptr, ptr %7, align 8, !tbaa !5
  %48 = call ptr @recursive_find_LCA(ptr noundef %45, ptr noundef %46, ptr noundef %47)
  store ptr %48, ptr %4, align 8
  br label %51

49:                                               ; preds = %11
  %50 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %50, ptr %4, align 8
  br label %51

51:                                               ; preds = %49, %44, %10
  %52 = load ptr, ptr %4, align 8
  ret ptr %52
}

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, !11, i64 0}
!10 = !{!"Node", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = !{!10, !6, i64 16}


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

.lr.ph:                                           ; preds = %3
  %5 = load i32, ptr %1, align 8, !tbaa !5
  %6 = load i32, ptr %2, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %.lr.ph, %tailrecurse
  %.tr16 = phi ptr [ %0, %.lr.ph ], [ %14, %tailrecurse ]
  %8 = load i32, ptr %.tr16, align 8, !tbaa !5
  %9 = sub nsw i32 %5, %8
  %10 = sub nsw i32 %6, %8
  %11 = mul nsw i32 %10, %9
  %12 = icmp sgt i32 %11, 0
  br i1 %12, label %tailrecurse, label %._crit_edge

tailrecurse:                                      ; preds = %7
  %13 = icmp sgt i32 %8, %5
  %.in.v = select i1 %13, i64 8, i64 16
  %.in = getelementptr inbounds i8, ptr %.tr16, i64 %.in.v
  %14 = load ptr, ptr %.in, align 8, !tbaa !11
  %15 = icmp eq ptr %14, null
  br i1 %15, label %._crit_edge, label %7

._crit_edge:                                      ; preds = %tailrecurse, %7, %3
  %.0 = phi ptr [ null, %3 ], [ %.tr16, %7 ], [ null, %tailrecurse ]
  ret ptr %.0
}

attributes #0 = { nofree norecurse nosync nounwind 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, !7, i64 0}
!6 = !{!"Node", !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}


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