; LLVM IR from PacktPublishing/CPP-Data-Structures-and-Algorithms :: Chapter07/Binary_Search_Tree/include/BSTNode.ll (ZN3BST6SearchEP7BSTNodei)

; 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"

%class.BSTNode = type { i32, ptr, ptr, ptr, i32 }

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_ZN3BST6SearchEP7BSTNodei(ptr noundef nonnull align 8 dereferenceable(8) %0, ptr noundef %1, i32 noundef %2) #0 align 2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  %8 = load ptr, ptr %5, align 8
  %9 = load ptr, ptr %6, align 8, !tbaa !5
  %10 = icmp eq ptr %9, null
  br i1 %10, label %11, label %12

11:                                               ; preds = %3
  store ptr null, ptr %4, align 8
  br label %38

12:                                               ; preds = %3
  %13 = load ptr, ptr %6, align 8, !tbaa !5
  %14 = getelementptr inbounds %class.BSTNode, ptr %13, i32 0, i32 0
  %15 = load i32, ptr %14, align 8, !tbaa !11
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = icmp eq i32 %15, %16
  br i1 %17, label %18, label %20

18:                                               ; preds = %12
  %19 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %19, ptr %4, align 8
  br label %38

20:                                               ; preds = %12
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = getelementptr inbounds %class.BSTNode, ptr %21, i32 0, i32 0
  %23 = load i32, ptr %22, align 8, !tbaa !11
  %24 = load i32, ptr %7, align 4, !tbaa !9
  %25 = icmp slt i32 %23, %24
  br i1 %25, label %26, label %32

26:                                               ; preds = %20
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  %28 = getelementptr inbounds %class.BSTNode, ptr %27, i32 0, i32 2
  %29 = load ptr, ptr %28, align 8, !tbaa !13
  %30 = load i32, ptr %7, align 4, !tbaa !9
  %31 = call noundef ptr @_ZN3BST6SearchEP7BSTNodei(ptr noundef nonnull align 8 dereferenceable(8) %8, ptr noundef %29, i32 noundef %30)
  store ptr %31, ptr %4, align 8
  br label %38

32:                                               ; preds = %20
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  %34 = getelementptr inbounds %class.BSTNode, ptr %33, i32 0, i32 1
  %35 = load ptr, ptr %34, align 8, !tbaa !14
  %36 = load i32, ptr %7, align 4, !tbaa !9
  %37 = call noundef ptr @_ZN3BST6SearchEP7BSTNodei(ptr noundef nonnull align 8 dereferenceable(8) %8, ptr noundef %35, i32 noundef %36)
  store ptr %37, ptr %4, align 8
  br label %38

38:                                               ; preds = %32, %26, %18, %11
  %39 = load ptr, ptr %4, align 8
  ret ptr %39
}

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 0}
!12 = !{!"_ZTS7BSTNode", !10, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !10, i64 32}
!13 = !{!12, !6, i64 16}
!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 norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef ptr @_ZN3BST6SearchEP7BSTNodei(ptr nocapture noundef nonnull readnone align 8 dereferenceable(8) %0, ptr noundef readonly %1, i32 noundef %2) local_unnamed_addr #0 align 2 {
  %4 = icmp eq ptr %1, null
  br i1 %4, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3, %tailrecurse.backedge
  %.tr1416 = phi ptr [ %.tr14.be, %tailrecurse.backedge ], [ %1, %3 ]
  %5 = load i32, ptr %.tr1416, align 8, !tbaa !5
  %6 = icmp eq i32 %5, %2
  br i1 %6, label %._crit_edge, label %tailrecurse.backedge

tailrecurse.backedge:                             ; preds = %.lr.ph
  %7 = icmp slt i32 %5, %2
  %spec.select = select i1 %7, i64 16, i64 8
  %8 = getelementptr inbounds i8, ptr %.tr1416, i64 %spec.select
  %.tr14.be = load ptr, ptr %8, align 8, !tbaa !11
  %9 = icmp eq ptr %.tr14.be, null
  br i1 %9, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %tailrecurse.backedge, %.lr.ph, %3
  %.0 = phi ptr [ null, %3 ], [ %.tr1416, %.lr.ph ], [ null, %tailrecurse.backedge ]
  ret ptr %.0
}

attributes #0 = { mustprogress nofree norecurse 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, !7, i64 0}
!6 = !{!"_ZTS7BSTNode", !7, i64 0, !10, i64 8, !10, i64 16, !10, i64 24, !7, i64 32}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!10, !10, i64 0}


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