; LLVM IR from UtkarshPathrabe/Competitive-Coding :: Model Algorithms/Binary Tree/Diameter of Tree.ll (Z8diameterP4node)

; 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: 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 @_Z3maxii(i32 noundef, i32 noundef) #1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z6heightP4node(ptr noundef) #2

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z8diameterP4node(ptr noundef %0) #2 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = icmp eq ptr %8, null
  br i1 %9, label %10, label %11

10:                                               ; preds = %1
  store i32 0, ptr %2, align 4
  br label %36

11:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.node, ptr %12, i32 0, i32 1
  %14 = load ptr, ptr %13, align 8, !tbaa !9
  %15 = call noundef i32 @_Z6heightP4node(ptr noundef %14)
  store i32 %15, ptr %4, align 4, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.node, ptr %16, i32 0, i32 2
  %18 = load ptr, ptr %17, align 8, !tbaa !13
  %19 = call noundef i32 @_Z6heightP4node(ptr noundef %18)
  store i32 %19, ptr %5, align 4, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.node, ptr %20, i32 0, i32 1
  %22 = load ptr, ptr %21, align 8, !tbaa !9
  %23 = call noundef i32 @_Z8diameterP4node(ptr noundef %22)
  store i32 %23, ptr %6, align 4, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.node, ptr %24, i32 0, i32 2
  %26 = load ptr, ptr %25, align 8, !tbaa !13
  %27 = call noundef i32 @_Z8diameterP4node(ptr noundef %26)
  store i32 %27, ptr %7, align 4, !tbaa !12
  %28 = load i32, ptr %6, align 4, !tbaa !12
  %29 = load i32, ptr %7, align 4, !tbaa !12
  %30 = call noundef i32 @_Z3maxii(i32 noundef %28, i32 noundef %29)
  %31 = load i32, ptr %5, align 4, !tbaa !12
  %32 = add nsw i32 1, %31
  %33 = load i32, ptr %4, align 4, !tbaa !12
  %34 = add nsw i32 %32, %33
  %35 = call noundef i32 @_Z3maxii(i32 noundef %30, i32 noundef %34)
  store i32 %35, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %36

36:                                               ; preds = %11, %10
  %37 = load i32, ptr %2, align 4
  ret i32 %37
}

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 = { 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 #3 = { 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}
!11 = !{!"int", !7, i64 0}
!12 = !{!11, !11, i64 0}
!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: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z3maxii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z6heightP4node(ptr noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z8diameterP4node(ptr noundef readonly %0) local_unnamed_addr #1 {
  %2 = icmp eq ptr %0, null
  br i1 %2, label %common.ret10, label %3

common.ret10:                                     ; preds = %1, %3
  %common.ret10.op = phi i32 [ %17, %3 ], [ 0, %1 ]
  ret i32 %common.ret10.op

3:                                                ; preds = %1
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %6 = tail call noundef i32 @_Z6heightP4node(ptr noundef %5)
  %7 = getelementptr inbounds i8, ptr %0, i64 16
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  %9 = tail call noundef i32 @_Z6heightP4node(ptr noundef %8)
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = tail call noundef i32 @_Z8diameterP4node(ptr noundef %10)
  %12 = load ptr, ptr %7, align 8, !tbaa !11
  %13 = tail call noundef i32 @_Z8diameterP4node(ptr noundef %12)
  %14 = tail call noundef i32 @_Z3maxii(i32 noundef %11, i32 noundef %13)
  %15 = add i32 %6, 1
  %16 = add i32 %15, %9
  %17 = tail call noundef i32 @_Z3maxii(i32 noundef %14, i32 noundef %16)
  br label %common.ret10
}

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" }
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" }

!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}
!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: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass