; LLVM IR from Lakhankumawat/LearnCPP :: T-Tree/B-BinaryTree/Height_of_Tree.ll (Z6heightP4Node)

; 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, ptr }

; 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 @_Z6heightP4Node(ptr noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %8, label %9

8:                                                ; preds = %1
  store i32 0, ptr %2, align 4
  br label %39

9:                                                ; preds = %1
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.Node, ptr %10, i32 0, i32 1
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  %13 = icmp eq ptr %12, null
  br i1 %13, label %14, label %20

14:                                               ; preds = %9
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.Node, ptr %15, i32 0, i32 2
  %17 = load ptr, ptr %16, align 8, !tbaa !12
  %18 = icmp eq ptr %17, null
  br i1 %18, label %19, label %20

19:                                               ; preds = %14
  store i32 1, ptr %2, align 4
  br label %39

20:                                               ; preds = %14, %9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.Node, ptr %21, i32 0, i32 1
  %23 = load ptr, ptr %22, align 8, !tbaa !9
  %24 = call noundef i32 @_Z6heightP4Node(ptr noundef %23)
  store i32 %24, ptr %4, align 4, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.Node, ptr %25, i32 0, i32 2
  %27 = load ptr, ptr %26, align 8, !tbaa !12
  %28 = call noundef i32 @_Z6heightP4Node(ptr noundef %27)
  store i32 %28, ptr %5, align 4, !tbaa !13
  %29 = load i32, ptr %4, align 4, !tbaa !13
  %30 = load i32, ptr %5, align 4, !tbaa !13
  %31 = icmp sgt i32 %29, %30
  br i1 %31, label %32, label %34

32:                                               ; preds = %20
  %33 = load i32, ptr %4, align 4, !tbaa !13
  br label %36

34:                                               ; preds = %20
  %35 = load i32, ptr %5, align 4, !tbaa !13
  br label %36

36:                                               ; preds = %34, %32
  %37 = phi i32 [ %33, %32 ], [ %35, %34 ]
  %38 = add nsw i32 1, %37
  store i32 %38, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %39

39:                                               ; preds = %36, %19, %8
  %40 = load i32, ptr %2, align 4
  ret i32 %40
}

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, !6, i64 8}
!10 = !{!"_ZTS4Node", !11, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 16}
!13 = !{!11, !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 nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z6heightP4Node(ptr noundef readonly %0) local_unnamed_addr #0 {
  %2 = icmp eq ptr %0, null
  br i1 %2, label %common.ret10, label %3

3:                                                ; preds = %1
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %6 = icmp eq ptr %5, null
  %7 = getelementptr inbounds i8, ptr %0, i64 16
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  %9 = icmp eq ptr %8, null
  %or.cond = select i1 %6, i1 %9, i1 false
  br i1 %or.cond, label %common.ret10, label %._crit_edge

common.ret10:                                     ; preds = %1, %3, %._crit_edge
  %common.ret10.op = phi i32 [ %13, %._crit_edge ], [ 0, %1 ], [ 1, %3 ]
  ret i32 %common.ret10.op

._crit_edge:                                      ; preds = %3
  %10 = tail call noundef i32 @_Z6heightP4Node(ptr noundef %5)
  %11 = tail call noundef i32 @_Z6heightP4Node(ptr noundef %8)
  %12 = tail call i32 @llvm.smax.i32(i32 %10, i32 %11)
  %13 = add nsw i32 %12, 1
  br label %common.ret10
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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 8}
!6 = !{!"_ZTS4Node", !7, i64 0, !10, i64 8, !10, i64 16, !10, i64 24}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 16}


; Effective O3 passes: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass