; LLVM IR from chachaxw/data-structure-and-algorithm :: leetcode/binary_tree/binary_tree.ll (Z11printLevel2P8TreeNodei)

; 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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%struct.TreeNode = type { i32, i32, ptr, ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z11printLevel2P8TreeNodei(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %6 = load ptr, ptr %4, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %11, label %8

8:                                                ; preds = %2
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = icmp slt i32 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %8, %2
  store i32 0, ptr %3, align 4
  br label %34

12:                                               ; preds = %8
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = icmp eq i32 %13, 0
  br i1 %14, label %15, label %20

15:                                               ; preds = %12
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.TreeNode, ptr %16, i32 0, i32 0
  %18 = load i32, ptr %17, align 8, !tbaa !11
  %19 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %18)
  store i32 1, ptr %3, align 4
  br label %34

20:                                               ; preds = %12
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.TreeNode, ptr %21, i32 0, i32 2
  %23 = load ptr, ptr %22, align 8, !tbaa !13
  %24 = load i32, ptr %5, align 4, !tbaa !9
  %25 = sub nsw i32 %24, 1
  %26 = call noundef i32 @_Z11printLevel2P8TreeNodei(ptr noundef %23, i32 noundef %25)
  %27 = load ptr, ptr %4, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.TreeNode, ptr %27, i32 0, i32 3
  %29 = load ptr, ptr %28, align 8, !tbaa !14
  %30 = load i32, ptr %5, align 4, !tbaa !9
  %31 = sub nsw i32 %30, 1
  %32 = call noundef i32 @_Z11printLevel2P8TreeNodei(ptr noundef %29, i32 noundef %31)
  %33 = add nsw i32 %26, %32
  store i32 %33, ptr %3, align 4
  br label %34

34:                                               ; preds = %20, %15, %11
  %35 = load i32, ptr %3, align 4
  ret i32 %35
}

attributes #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, !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, !10, i64 4, !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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z11printLevel2P8TreeNodei(ptr noundef readonly %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = icmp eq ptr %0, null
  %4 = icmp slt i32 %1, 0
  %or.cond15 = or i1 %3, %4
  br i1 %or.cond15, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %2, %tailrecurse
  %.tr1118 = phi i32 [ %11, %tailrecurse ], [ %1, %2 ]
  %.tr17 = phi ptr [ %14, %tailrecurse ], [ %0, %2 ]
  %accumulator.tr16 = phi i32 [ %15, %tailrecurse ], [ 0, %2 ]
  %5 = icmp eq i32 %.tr1118, 0
  br i1 %5, label %6, label %tailrecurse

6:                                                ; preds = %.lr.ph
  %7 = load i32, ptr %.tr17, align 8, !tbaa !5
  %8 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %7)
  br label %.loopexit

tailrecurse:                                      ; preds = %.lr.ph
  %9 = getelementptr inbounds i8, ptr %.tr17, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !11
  %11 = add nsw i32 %.tr1118, -1
  %12 = tail call noundef i32 @_Z11printLevel2P8TreeNodei(ptr noundef %10, i32 noundef %11)
  %13 = getelementptr inbounds i8, ptr %.tr17, i64 16
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  %15 = add nsw i32 %12, %accumulator.tr16
  %16 = icmp eq ptr %14, null
  br i1 %16, label %.loopexit, label %.lr.ph

.loopexit:                                        ; preds = %tailrecurse, %2, %6
  %accumulator.tr14 = phi i32 [ %accumulator.tr16, %6 ], [ 0, %2 ], [ %15, %tailrecurse ]
  %.0 = phi i32 [ 1, %6 ], [ 0, %2 ], [ 0, %tailrecurse ]
  %accumulator.ret.tr = add nsw i32 %.0, %accumulator.tr14
  ret i32 %accumulator.ret.tr
}

attributes #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, !7, i64 0}
!6 = !{!"_ZTS8TreeNode", !7, i64 0, !7, i64 4, !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}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass