; LLVM IR from bartobri/data-structures-c :: binary-tree/delete-leaf (tree)

; 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: 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: nounwind uwtable
define dso_local ptr @deleteLeaf(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.treenode, ptr %8, i32 0, i32 1
  %10 = load ptr, ptr %9, align 8, !tbaa !11
  %11 = icmp eq ptr %10, null
  br i1 %11, label %12, label %25

12:                                               ; preds = %2
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.treenode, ptr %13, i32 0, i32 2
  %15 = load ptr, ptr %14, align 8, !tbaa !13
  %16 = icmp eq ptr %15, null
  br i1 %16, label %17, label %25

17:                                               ; preds = %12
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.treenode, ptr %18, i32 0, i32 0
  %20 = load i32, ptr %19, align 8, !tbaa !14
  %21 = load i32, ptr %5, align 4, !tbaa !9
  %22 = icmp eq i32 %20, %21
  br i1 %22, label %23, label %25

23:                                               ; preds = %17
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  call void @free(ptr noundef %24) #3
  store ptr null, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %53

25:                                               ; preds = %17, %12, %2
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.treenode, ptr %26, i32 0, i32 1
  %28 = load ptr, ptr %27, align 8, !tbaa !11
  %29 = icmp ne ptr %28, null
  br i1 %29, label %30, label %38

30:                                               ; preds = %25
  %31 = load ptr, ptr %4, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.treenode, ptr %31, i32 0, i32 1
  %33 = load ptr, ptr %32, align 8, !tbaa !11
  %34 = load i32, ptr %5, align 4, !tbaa !9
  %35 = call ptr @deleteLeaf(ptr noundef %33, i32 noundef %34)
  %36 = load ptr, ptr %4, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.treenode, ptr %36, i32 0, i32 1
  store ptr %35, ptr %37, align 8, !tbaa !11
  br label %38

38:                                               ; preds = %30, %25
  %39 = load ptr, ptr %4, align 8, !tbaa !5
  %40 = getelementptr inbounds %struct.treenode, ptr %39, i32 0, i32 2
  %41 = load ptr, ptr %40, align 8, !tbaa !13
  %42 = icmp ne ptr %41, null
  br i1 %42, label %43, label %51

43:                                               ; preds = %38
  %44 = load ptr, ptr %4, align 8, !tbaa !5
  %45 = getelementptr inbounds %struct.treenode, ptr %44, i32 0, i32 2
  %46 = load ptr, ptr %45, align 8, !tbaa !13
  %47 = load i32, ptr %5, align 4, !tbaa !9
  %48 = call ptr @deleteLeaf(ptr noundef %46, i32 noundef %47)
  %49 = load ptr, ptr %4, align 8, !tbaa !5
  %50 = getelementptr inbounds %struct.treenode, ptr %49, i32 0, i32 2
  store ptr %48, ptr %50, align 8, !tbaa !13
  br label %51

51:                                               ; preds = %43, %38
  %52 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %52, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %53

53:                                               ; preds = %51, %23
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  %54 = load ptr, ptr %3, align 8
  ret ptr %54
}

; Function Attrs: nounwind
declare void @free(ptr noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { nounwind "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 }

!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 noundef ptr @deleteLeaf(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %5 = icmp eq ptr %4, null
  br i1 %5, label %6, label %.thread

6:                                                ; preds = %2
  %7 = getelementptr inbounds i8, ptr %0, i64 16
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  %9 = icmp eq ptr %8, null
  br i1 %9, label %10, label %.thread.thread18

10:                                               ; preds = %6
  %11 = load i32, ptr %0, align 8, !tbaa !12
  %12 = icmp eq i32 %11, %1
  br i1 %12, label %13, label %common.ret20

13:                                               ; preds = %10
  tail call void @free(ptr noundef nonnull %0) #2
  br label %common.ret20

.thread:                                          ; preds = %2
  %14 = tail call ptr @deleteLeaf(ptr noundef nonnull %4, i32 noundef %1)
  store ptr %14, ptr %3, align 8, !tbaa !5
  %.phi.trans.insert = getelementptr inbounds i8, ptr %0, i64 16
  %.pre = load ptr, ptr %.phi.trans.insert, align 8, !tbaa !11
  %.not16 = icmp eq ptr %.pre, null
  br i1 %.not16, label %common.ret20, label %.thread.thread18

common.ret20:                                     ; preds = %.thread, %13, %10, %.thread.thread18
  %common.ret20.op = phi ptr [ %0, %.thread.thread18 ], [ null, %13 ], [ %0, %.thread ], [ %0, %10 ]
  ret ptr %common.ret20.op

.thread.thread18:                                 ; preds = %6, %.thread
  %15 = phi ptr [ %.pre, %.thread ], [ %8, %6 ]
  %16 = getelementptr inbounds i8, ptr %0, i64 16
  %17 = tail call ptr @deleteLeaf(ptr noundef nonnull %15, i32 noundef %1)
  store ptr %17, ptr %16, align 8, !tbaa !11
  br label %common.ret20
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #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 nounwind willreturn allockind("free") memory(argmem: readwrite, 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 #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, !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}
!12 = !{!6, !7, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass