; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/ds/RootToLeafSum.ll (Z8preorderP8TreeNodei)

; 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.TreeNode = type { i32, ptr, ptr }

@total_sum = external dso_local global i32, align 4

; Function Attrs: mustprogress uwtable
define dso_local void @_Z8preorderP8TreeNodei(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  %6 = icmp eq ptr %5, null
  br i1 %6, label %7, label %8

7:                                                ; preds = %2
  br label %37

8:                                                ; preds = %2
  %9 = load i32, ptr %4, align 4, !tbaa !9
  %10 = mul nsw i32 %9, 2
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.TreeNode, ptr %11, i32 0, i32 0
  %13 = load i32, ptr %12, align 8, !tbaa !11
  %14 = add nsw i32 %10, %13
  store i32 %14, ptr %4, align 4, !tbaa !9
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.TreeNode, ptr %15, i32 0, i32 1
  %17 = load ptr, ptr %16, align 8, !tbaa !13
  %18 = icmp eq ptr %17, null
  br i1 %18, label %19, label %28

19:                                               ; preds = %8
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.TreeNode, ptr %20, i32 0, i32 2
  %22 = load ptr, ptr %21, align 8, !tbaa !14
  %23 = icmp eq ptr %22, null
  br i1 %23, label %24, label %28

24:                                               ; preds = %19
  %25 = load i32, ptr %4, align 4, !tbaa !9
  %26 = load i32, ptr @total_sum, align 4, !tbaa !9
  %27 = add nsw i32 %26, %25
  store i32 %27, ptr @total_sum, align 4, !tbaa !9
  br label %28

28:                                               ; preds = %24, %19, %8
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.TreeNode, ptr %29, i32 0, i32 1
  %31 = load ptr, ptr %30, align 8, !tbaa !13
  %32 = load i32, ptr %4, align 4, !tbaa !9
  call void @_Z8preorderP8TreeNodei(ptr noundef %31, i32 noundef %32)
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.TreeNode, ptr %33, i32 0, i32 2
  %35 = load ptr, ptr %34, align 8, !tbaa !14
  %36 = load i32, ptr %4, align 4, !tbaa !9
  call void @_Z8preorderP8TreeNodei(ptr noundef %35, i32 noundef %36)
  br label %37

37:                                               ; preds = %28, %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, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"_ZTS8TreeNode", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !6, i64 8}
!14 = !{!12, !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"

@total_sum = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, argmem: read, inaccessiblemem: none) uwtable
define dso_local void @_Z8preorderP8TreeNodei(ptr noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  br i1 %3, label %tailrecurse._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %tailrecurse
  %.tr911 = phi i32 [ %6, %tailrecurse ], [ %1, %2 ]
  %.tr10 = phi ptr [ %18, %tailrecurse ], [ %0, %2 ]
  %4 = shl nsw i32 %.tr911, 1
  %5 = load i32, ptr %.tr10, align 8, !tbaa !5
  %6 = add nsw i32 %5, %4
  %7 = getelementptr inbounds i8, ptr %.tr10, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  %9 = icmp eq ptr %8, null
  br i1 %9, label %10, label %tailrecurse

10:                                               ; preds = %.lr.ph
  %11 = getelementptr inbounds i8, ptr %.tr10, i64 16
  %12 = load ptr, ptr %11, align 8, !tbaa !12
  %13 = icmp eq ptr %12, null
  br i1 %13, label %14, label %tailrecurse

14:                                               ; preds = %10
  %15 = load i32, ptr @total_sum, align 4, !tbaa !13
  %16 = add nsw i32 %15, %6
  store i32 %16, ptr @total_sum, align 4, !tbaa !13
  br label %tailrecurse

tailrecurse:                                      ; preds = %14, %10, %.lr.ph
  tail call void @_Z8preorderP8TreeNodei(ptr noundef %8, i32 noundef %6)
  %17 = getelementptr inbounds i8, ptr %.tr10, i64 16
  %18 = load ptr, ptr %17, align 8, !tbaa !12
  %19 = icmp eq ptr %18, null
  br i1 %19, label %tailrecurse._crit_edge, label %.lr.ph

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %2
  ret void
}

attributes #0 = { mustprogress nofree nosync nounwind memory(readwrite, argmem: 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, !7, i64 0}
!6 = !{!"_ZTS8TreeNode", !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 8}
!12 = !{!6, !10, i64 16}
!13 = !{!7, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass