; LLVM IR from UtkarshPathrabe/Competitive-Coding :: Model Algorithms/Binary Tree/Children Sum Property.ll (Z8checkSumP4node)

; 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
define dso_local noundef i32 @_Z8checkSumP4node(ptr noundef %0) #1 {
  %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
  store ptr %0, ptr %3, align 8, !tbaa !5
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = icmp eq ptr %7, null
  br i1 %8, label %19, label %9

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, %1
  store i32 1, ptr %2, align 4
  br label %65

20:                                               ; preds = %14, %9
  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
  store i32 0, ptr %5, align 4, !tbaa !13
  %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 = icmp ne ptr %23, null
  br i1 %24, label %25, label %31

25:                                               ; preds = %20
  %26 = load ptr, ptr %3, 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 = getelementptr inbounds %struct.node, ptr %28, i32 0, i32 0
  %30 = load i32, ptr %29, align 8, !tbaa !14
  store i32 %30, ptr %4, align 4, !tbaa !13
  br label %31

31:                                               ; preds = %25, %20
  %32 = load ptr, ptr %3, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.node, ptr %32, i32 0, i32 2
  %34 = load ptr, ptr %33, align 8, !tbaa !12
  %35 = icmp ne ptr %34, null
  br i1 %35, label %36, label %42

36:                                               ; preds = %31
  %37 = load ptr, ptr %3, 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 = getelementptr inbounds %struct.node, ptr %39, i32 0, i32 0
  %41 = load i32, ptr %40, align 8, !tbaa !14
  store i32 %41, ptr %5, align 4, !tbaa !13
  br label %42

42:                                               ; preds = %36, %31
  %43 = load ptr, ptr %3, align 8, !tbaa !5
  %44 = getelementptr inbounds %struct.node, ptr %43, i32 0, i32 0
  %45 = load i32, ptr %44, align 8, !tbaa !14
  %46 = load i32, ptr %4, align 4, !tbaa !13
  %47 = load i32, ptr %5, align 4, !tbaa !13
  %48 = add nsw i32 %46, %47
  %49 = icmp eq i32 %45, %48
  br i1 %49, label %50, label %63

50:                                               ; preds = %42
  %51 = load ptr, ptr %3, align 8, !tbaa !5
  %52 = getelementptr inbounds %struct.node, ptr %51, i32 0, i32 1
  %53 = load ptr, ptr %52, align 8, !tbaa !9
  %54 = call noundef i32 @_Z8checkSumP4node(ptr noundef %53)
  %55 = icmp ne i32 %54, 0
  br i1 %55, label %56, label %63

56:                                               ; preds = %50
  %57 = load ptr, ptr %3, align 8, !tbaa !5
  %58 = getelementptr inbounds %struct.node, ptr %57, i32 0, i32 2
  %59 = load ptr, ptr %58, align 8, !tbaa !12
  %60 = call noundef i32 @_Z8checkSumP4node(ptr noundef %59)
  %61 = icmp ne i32 %60, 0
  br i1 %61, label %62, label %63

62:                                               ; preds = %56
  store i32 1, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %64

63:                                               ; preds = %56, %50, %42
  store i32 0, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %64

64:                                               ; preds = %63, %62
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %65

65:                                               ; preds = %64, %19
  %66 = load i32, ptr %2, align 4
  ret i32 %66
}

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 nofree nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef range(i32 0, 2) i32 @_Z8checkSumP4node(ptr noundef readonly %0) local_unnamed_addr #0 {
  %2 = icmp eq ptr %0, null
  br i1 %2, label %24, 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 %.thread

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 %24, label %.thread.thread

.thread:                                          ; preds = %3
  %11 = load i32, ptr %5, align 8, !tbaa !12
  %.phi.trans.insert = getelementptr inbounds i8, ptr %0, i64 16
  %.pre = load ptr, ptr %.phi.trans.insert, align 8, !tbaa !11
  %.not17 = icmp eq ptr %.pre, null
  br i1 %.not17, label %14, label %.thread.thread

.thread.thread:                                   ; preds = %7, %.thread
  %.01222 = phi i32 [ %11, %.thread ], [ 0, %7 ]
  %12 = phi ptr [ %.pre, %.thread ], [ %9, %7 ]
  %13 = load i32, ptr %12, align 8, !tbaa !12
  br label %14

14:                                               ; preds = %.thread.thread, %.thread
  %.01223 = phi i32 [ %.01222, %.thread.thread ], [ %11, %.thread ]
  %15 = phi ptr [ %12, %.thread.thread ], [ null, %.thread ]
  %.0 = phi i32 [ %13, %.thread.thread ], [ 0, %.thread ]
  %16 = load i32, ptr %0, align 8, !tbaa !12
  %17 = add nsw i32 %.0, %.01223
  %18 = icmp eq i32 %16, %17
  br i1 %18, label %19, label %23

19:                                               ; preds = %14
  %20 = tail call noundef i32 @_Z8checkSumP4node(ptr noundef %5)
  %.not18 = icmp eq i32 %20, 0
  br i1 %.not18, label %23, label %21

21:                                               ; preds = %19
  %22 = tail call noundef i32 @_Z8checkSumP4node(ptr noundef %15)
  %.not19 = icmp eq i32 %22, 0
  br i1 %.not19, label %23, label %24

23:                                               ; preds = %21, %19, %14
  br label %24

24:                                               ; preds = %23, %21, %1, %7
  %.1 = phi i32 [ 1, %7 ], [ 1, %1 ], [ 0, %23 ], [ 1, %21 ]
  ret 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" }

!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: BDCEPass,CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass