; LLVM IR from UtkarshPathrabe/Competitive-Coding :: Model Algorithms/Binary Tree (Convert to  Children Sum Property)

; 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 uwtable
declare dso_local void @_Z9incrementP4nodei(ptr noundef, i32 noundef) #1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z18convertChildrenSumP4node(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %18, label %8

8:                                                ; preds = %1
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.node, ptr %9, i32 0, i32 1
  %11 = load ptr, ptr %10, align 8, !tbaa !9
  %12 = icmp eq ptr %11, null
  br i1 %12, label %13, label %19

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

18:                                               ; preds = %13, %1
  br label %72

19:                                               ; preds = %13, %8
  %20 = load ptr, ptr %2, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.node, ptr %20, i32 0, i32 1
  %22 = load ptr, ptr %21, align 8, !tbaa !9
  call void @_Z18convertChildrenSumP4node(ptr noundef %22)
  %23 = load ptr, ptr %2, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.node, ptr %23, i32 0, i32 2
  %25 = load ptr, ptr %24, align 8, !tbaa !12
  call void @_Z18convertChildrenSumP4node(ptr noundef %25)
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %26 = load ptr, ptr %2, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.node, ptr %26, i32 0, i32 1
  %28 = load ptr, ptr %27, align 8, !tbaa !9
  %29 = icmp ne ptr %28, null
  br i1 %29, label %30, label %36

30:                                               ; preds = %19
  %31 = load ptr, ptr %2, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.node, ptr %31, i32 0, i32 1
  %33 = load ptr, ptr %32, align 8, !tbaa !9
  %34 = getelementptr inbounds %struct.node, ptr %33, i32 0, i32 0
  %35 = load i32, ptr %34, align 8, !tbaa !14
  store i32 %35, ptr %3, align 4, !tbaa !13
  br label %36

36:                                               ; preds = %30, %19
  %37 = load ptr, ptr %2, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.node, ptr %37, i32 0, i32 2
  %39 = load ptr, ptr %38, align 8, !tbaa !12
  %40 = icmp ne ptr %39, null
  br i1 %40, label %41, label %47

41:                                               ; preds = %36
  %42 = load ptr, ptr %2, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.node, ptr %42, i32 0, i32 2
  %44 = load ptr, ptr %43, align 8, !tbaa !12
  %45 = getelementptr inbounds %struct.node, ptr %44, i32 0, i32 0
  %46 = load i32, ptr %45, align 8, !tbaa !14
  store i32 %46, ptr %4, align 4, !tbaa !13
  br label %47

47:                                               ; preds = %41, %36
  %48 = load i32, ptr %3, align 4, !tbaa !13
  %49 = load i32, ptr %4, align 4, !tbaa !13
  %50 = add nsw i32 %48, %49
  %51 = load ptr, ptr %2, align 8, !tbaa !5
  %52 = getelementptr inbounds %struct.node, ptr %51, i32 0, i32 0
  %53 = load i32, ptr %52, align 8, !tbaa !14
  %54 = sub nsw i32 %50, %53
  store i32 %54, ptr %5, align 4, !tbaa !13
  %55 = load i32, ptr %5, align 4, !tbaa !13
  %56 = icmp sgt i32 %55, 0
  br i1 %56, label %57, label %63

57:                                               ; preds = %47
  %58 = load i32, ptr %5, align 4, !tbaa !13
  %59 = load ptr, ptr %2, align 8, !tbaa !5
  %60 = getelementptr inbounds %struct.node, ptr %59, i32 0, i32 0
  %61 = load i32, ptr %60, align 8, !tbaa !14
  %62 = add nsw i32 %61, %58
  store i32 %62, ptr %60, align 8, !tbaa !14
  br label %71

63:                                               ; preds = %47
  %64 = load i32, ptr %5, align 4, !tbaa !13
  %65 = icmp slt i32 %64, 0
  br i1 %65, label %66, label %70

66:                                               ; preds = %63
  %67 = load ptr, ptr %2, align 8, !tbaa !5
  %68 = load i32, ptr %5, align 4, !tbaa !13
  %69 = sub nsw i32 0, %68
  call void @_Z9incrementP4nodei(ptr noundef %67, i32 noundef %69)
  br label %70

70:                                               ; preds = %66, %63
  br label %71

71:                                               ; preds = %70, %57
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  br label %72

72:                                               ; preds = %71, %18
  ret void
}

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}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 16}
!13 = !{!11, !11, i64 0}
!14 = !{!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 uwtable
declare dso_local void @_Z9incrementP4nodei(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z18convertChildrenSumP4node(ptr noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq ptr %0, null
  br i1 %2, label %31, 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
  br i1 %6, label %7, label %11

7:                                                ; preds = %3
  %8 = getelementptr inbounds i8, ptr %0, i64 16
  %9 = load ptr, ptr %8, align 8, !tbaa !11
  %10 = icmp eq ptr %9, null
  br i1 %10, label %31, label %11

11:                                               ; preds = %7, %3
  tail call void @_Z18convertChildrenSumP4node(ptr noundef %5)
  %12 = getelementptr inbounds i8, ptr %0, i64 16
  %13 = load ptr, ptr %12, align 8, !tbaa !11
  tail call void @_Z18convertChildrenSumP4node(ptr noundef %13)
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %.not = icmp eq ptr %14, null
  br i1 %.not, label %17, label %15

15:                                               ; preds = %11
  %16 = load i32, ptr %14, align 8, !tbaa !12
  br label %17

17:                                               ; preds = %15, %11
  %.0 = phi i32 [ %16, %15 ], [ 0, %11 ]
  %18 = load ptr, ptr %12, align 8, !tbaa !11
  %.not22 = icmp eq ptr %18, null
  br i1 %.not22, label %21, label %19

19:                                               ; preds = %17
  %20 = load i32, ptr %18, align 8, !tbaa !12
  br label %21

21:                                               ; preds = %19, %17
  %.017 = phi i32 [ %20, %19 ], [ 0, %17 ]
  %22 = add nsw i32 %.017, %.0
  %23 = load i32, ptr %0, align 8, !tbaa !12
  %24 = sub nsw i32 %22, %23
  %25 = icmp sgt i32 %24, 0
  br i1 %25, label %26, label %27

26:                                               ; preds = %21
  store i32 %22, ptr %0, align 8, !tbaa !12
  br label %31

27:                                               ; preds = %21
  %28 = icmp slt i32 %24, 0
  br i1 %28, label %29, label %31

29:                                               ; preds = %27
  %30 = sub nsw i32 0, %24
  tail call void @_Z9incrementP4nodei(ptr noundef nonnull %0, i32 noundef %30)
  br label %31

31:                                               ; preds = %26, %29, %27, %1, %7
  ret void
}

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, !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}
!12 = !{!6, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass