; LLVM IR from wuzhouhui/leetcode :: 222_count_comp_bin_tree (countNodes)

; 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 }

; Function Attrs: nounwind uwtable
define dso_local i32 @countNodes(ptr noundef %0) #0 {
  %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 ne ptr %7, null
  br i1 %8, label %10, label %9

9:                                                ; preds = %1
  store i32 0, ptr %2, align 4
  br label %34

10:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = call i32 @lheight(ptr noundef %11)
  store i32 %12, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = call i32 @rheight(ptr noundef %13)
  store i32 %14, ptr %5, align 4, !tbaa !9
  %15 = load i32, ptr %4, align 4, !tbaa !9
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = icmp eq i32 %15, %16
  br i1 %17, label %18, label %22

18:                                               ; preds = %10
  %19 = load i32, ptr %4, align 4, !tbaa !9
  %20 = shl i32 1, %19
  %21 = sub nsw i32 %20, 1
  store i32 %21, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %33

22:                                               ; preds = %10
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.TreeNode, ptr %23, i32 0, i32 1
  %25 = load ptr, ptr %24, align 8, !tbaa !11
  %26 = call i32 @countNodes(ptr noundef %25)
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.TreeNode, ptr %27, i32 0, i32 2
  %29 = load ptr, ptr %28, align 8, !tbaa !13
  %30 = call i32 @countNodes(ptr noundef %29)
  %31 = add nsw i32 %26, %30
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %33

33:                                               ; preds = %22, %18
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %34

34:                                               ; preds = %33, %9
  %35 = load i32, ptr %2, align 4
  ret i32 %35
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
declare hidden i32 @lheight(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare hidden i32 @rheight(ptr noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 8}
!12 = !{!"TreeNode", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!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"

; Function Attrs: nounwind uwtable
define dso_local i32 @countNodes(ptr noundef %0) local_unnamed_addr #0 {
  br label %tailrecurse

tailrecurse:                                      ; preds = %8, %1
  %accumulator.tr = phi i32 [ 0, %1 ], [ %15, %8 ]
  %.tr = phi ptr [ %0, %1 ], [ %13, %8 ]
  %.not = icmp eq ptr %.tr, null
  br i1 %.not, label %common.ret, label %2

2:                                                ; preds = %tailrecurse
  %3 = tail call i32 @lheight(ptr noundef nonnull %.tr)
  %4 = tail call i32 @rheight(ptr noundef nonnull %.tr)
  %5 = icmp eq i32 %3, %4
  br i1 %5, label %6, label %8

6:                                                ; preds = %2
  %notmask = shl nsw i32 -1, %3
  %7 = xor i32 %notmask, -1
  br label %common.ret

common.ret:                                       ; preds = %tailrecurse, %6
  %common.ret.op = phi i32 [ 0, %tailrecurse ], [ %7, %6 ]
  %accumulator.ret.tr = add i32 %common.ret.op, %accumulator.tr
  ret i32 %accumulator.ret.tr

8:                                                ; preds = %2
  %9 = getelementptr inbounds i8, ptr %.tr, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !5
  %11 = tail call i32 @countNodes(ptr noundef %10)
  %12 = getelementptr inbounds i8, ptr %.tr, i64 16
  %13 = load ptr, ptr %12, align 8, !tbaa !11
  %14 = add i32 %11, 1
  %15 = add i32 %14, %accumulator.tr
  br label %tailrecurse
}

; Function Attrs: nounwind uwtable
declare hidden i32 @lheight(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare hidden i32 @rheight(ptr noundef) local_unnamed_addr #0

attributes #0 = { 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" }

!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 = !{!"TreeNode", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 16}


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