; LLVM IR from PacktPublishing/CPP-Data-Structures-and-Algorithms :: Chapter07/Binary_Search_Tree/include/BSTNode.ll (ZN3BST7FindMaxEP7BSTNode)

; 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 i32 @_ZN3BST7FindMaxEP7BSTNode(ptr noundef nonnull align 8 dereferenceable(8) %0, ptr noundef %1) #0 align 2 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %6 = load ptr, ptr %4, align 8
  %7 = load ptr, ptr %5, align 8, !tbaa !5
  %8 = icmp eq ptr %7, null
  br i1 %8, label %9, label %10

9:                                                ; preds = %2
  store i32 -1, ptr %3, align 4
  br label %24

10:                                               ; preds = %2
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = getelementptr inbounds %class.BSTNode, ptr %11, i32 0, i32 2
  %13 = load ptr, ptr %12, align 8, !tbaa !9
  %14 = icmp eq ptr %13, null
  br i1 %14, label %15, label %19

15:                                               ; preds = %10
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = getelementptr inbounds %class.BSTNode, ptr %16, i32 0, i32 0
  %18 = load i32, ptr %17, align 8, !tbaa !12
  store i32 %18, ptr %3, align 4
  br label %24

19:                                               ; preds = %10
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = getelementptr inbounds %class.BSTNode, ptr %20, i32 0, i32 2
  %22 = load ptr, ptr %21, align 8, !tbaa !9
  %23 = call noundef i32 @_ZN3BST7FindMaxEP7BSTNode(ptr noundef nonnull align 8 dereferenceable(8) %6, ptr noundef %22)
  store i32 %23, ptr %3, align 4
  br label %24

24:                                               ; preds = %19, %15, %9
  %25 = load i32, ptr %3, align 4
  ret i32 %25
}

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, !6, i64 16}
!10 = !{!"_ZTS7BSTNode", !11, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !11, i64 32}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 0}


; 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 i32 @_ZN3BST7FindMaxEP7BSTNode(ptr nocapture noundef nonnull readnone align 8 dereferenceable(8) %0, ptr noundef readonly %1) local_unnamed_addr #0 align 2 {
  br label %tailrecurse

tailrecurse:                                      ; preds = %4, %2
  %.tr7 = phi ptr [ %1, %2 ], [ %6, %4 ]
  %3 = icmp eq ptr %.tr7, null
  br i1 %3, label %.loopexit, label %4

4:                                                ; preds = %tailrecurse
  %5 = getelementptr inbounds i8, ptr %.tr7, i64 16
  %6 = load ptr, ptr %5, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %8, label %tailrecurse

8:                                                ; preds = %4
  %9 = load i32, ptr %.tr7, align 8, !tbaa !11
  br label %.loopexit

.loopexit:                                        ; preds = %tailrecurse, %8
  %.0 = phi i32 [ %9, %8 ], [ -1, %tailrecurse ]
  ret i32 %.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, !10, i64 16}
!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 = !{!6, !7, i64 0}


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