; LLVM IR from wuzhouhui/leetcode :: 145_bin_tree_post_trav (postorderTraversal)

; 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 ptr @postorderTraversal(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = icmp ne ptr %10, null
  br i1 %11, label %14, label %12

12:                                               ; preds = %2
  %13 = load ptr, ptr %5, align 8, !tbaa !5
  store i32 0, ptr %13, align 4, !tbaa !9
  store ptr null, ptr %3, align 8
  br label %43

14:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.TreeNode, ptr %15, i32 0, i32 1
  %17 = load ptr, ptr %16, align 8, !tbaa !11
  %18 = icmp ne ptr %17, null
  br i1 %18, label %33, label %19

19:                                               ; preds = %14
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.TreeNode, ptr %20, i32 0, i32 2
  %22 = load ptr, ptr %21, align 8, !tbaa !13
  %23 = icmp ne ptr %22, null
  br i1 %23, label %33, label %24

24:                                               ; preds = %19
  %25 = call noalias ptr @malloc(i64 noundef 4) #4
  store ptr %25, ptr %6, align 8, !tbaa !5
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.TreeNode, ptr %26, i32 0, i32 0
  %28 = load i32, ptr %27, align 8, !tbaa !14
  %29 = load ptr, ptr %6, align 8, !tbaa !5
  %30 = getelementptr inbounds i32, ptr %29, i64 0
  store i32 %28, ptr %30, align 4, !tbaa !9
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  store i32 1, ptr %31, align 4, !tbaa !9
  %32 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %32, ptr %3, align 8
  store i32 1, ptr %9, align 4
  br label %42

33:                                               ; preds = %19, %14
  store i32 16, ptr %7, align 4, !tbaa !9
  store i32 0, ptr %8, align 4, !tbaa !9
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = sext i32 %34 to i64
  %36 = mul i64 %35, 4
  %37 = call noalias ptr @malloc(i64 noundef %36) #4
  store ptr %37, ptr %6, align 8, !tbaa !5
  %38 = load ptr, ptr %4, align 8, !tbaa !5
  call void @post_trav(ptr noundef %38, ptr noundef %6, ptr noundef %7, ptr noundef %8)
  %39 = load i32, ptr %8, align 4, !tbaa !9
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  store i32 %39, ptr %40, align 4, !tbaa !9
  %41 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %41, ptr %3, align 8
  store i32 1, ptr %9, align 4
  br label %42

42:                                               ; preds = %33, %24
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br label %43

43:                                               ; preds = %42, %12
  %44 = load ptr, ptr %3, align 8
  ret ptr %44
}

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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; Function Attrs: nounwind uwtable
declare hidden void @post_trav(ptr noundef, ptr noundef, ptr noundef, 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 allocsize(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 #3 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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}
!14 = !{!12, !10, 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: nounwind uwtable
define dso_local ptr @postorderTraversal(ptr noundef %0, ptr nocapture noundef writeonly %1) local_unnamed_addr #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %6, label %7

6:                                                ; preds = %2
  store i32 0, ptr %1, align 4, !tbaa !5
  br label %21

7:                                                ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %5) #3
  %8 = getelementptr inbounds i8, ptr %0, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !9
  %.not10 = icmp eq ptr %9, null
  br i1 %.not10, label %10, label %16

10:                                               ; preds = %7
  %11 = getelementptr inbounds i8, ptr %0, i64 16
  %12 = load ptr, ptr %11, align 8, !tbaa !12
  %.not11 = icmp eq ptr %12, null
  br i1 %.not11, label %13, label %16

13:                                               ; preds = %10
  %14 = tail call noalias dereferenceable_or_null(4) ptr @malloc(i64 noundef 4) #4
  %15 = load i32, ptr %0, align 8, !tbaa !13
  store i32 %15, ptr %14, align 4, !tbaa !5
  store i32 1, ptr %1, align 4, !tbaa !5
  br label %20

16:                                               ; preds = %10, %7
  store i32 16, ptr %4, align 4, !tbaa !5
  store i32 0, ptr %5, align 4, !tbaa !5
  %17 = tail call noalias dereferenceable_or_null(64) ptr @malloc(i64 noundef 64) #4
  store ptr %17, ptr %3, align 8, !tbaa !14
  call void @post_trav(ptr noundef nonnull %0, ptr noundef nonnull %3, ptr noundef nonnull %4, ptr noundef nonnull %5)
  %18 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %18, ptr %1, align 4, !tbaa !5
  %19 = load ptr, ptr %3, align 8, !tbaa !14
  br label %20

20:                                               ; preds = %16, %13
  %.0 = phi ptr [ %19, %16 ], [ %14, %13 ]
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %5) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  br label %21

21:                                               ; preds = %20, %6
  %.1 = phi ptr [ %.0, %20 ], [ null, %6 ]
  ret ptr %.1
}

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

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #2

; Function Attrs: nounwind uwtable
declare hidden void @post_trav(ptr noundef, ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 #3 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 8}
!10 = !{!"TreeNode", !6, i64 0, !11, i64 8, !11, i64 16}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!10, !11, i64 16}
!13 = !{!10, !6, i64 0}
!14 = !{!11, !11, i64 0}


; Effective O3 passes: DSEPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,TailCallElimPass