; LLVM IR from gargarchit/Data_Structure_n_Algorithms :: Binary_Tree (Level_order_traversal)

; 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.Qnode = type { ptr, ptr }

@last = external dso_local global ptr, align 8

; 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
declare dso_local ptr @createNode(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @enqueue(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = call ptr @createNode(ptr noundef %5)
  store ptr %6, ptr %3, align 8, !tbaa !5
  %7 = load ptr, ptr @last, align 8, !tbaa !5
  %8 = icmp eq ptr %7, null
  br i1 %8, label %9, label %14

9:                                                ; preds = %1
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %10, ptr @last, align 8, !tbaa !5
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = load ptr, ptr @last, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.Qnode, ptr %12, i32 0, i32 1
  store ptr %11, ptr %13, align 8, !tbaa !9
  store i32 1, ptr %4, align 4
  br label %24

14:                                               ; preds = %1
  %15 = load ptr, ptr @last, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.Qnode, ptr %15, i32 0, i32 1
  %17 = load ptr, ptr %16, align 8, !tbaa !9
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.Qnode, ptr %18, i32 0, i32 1
  store ptr %17, ptr %19, align 8, !tbaa !9
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = load ptr, ptr @last, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.Qnode, ptr %21, i32 0, i32 1
  store ptr %20, ptr %22, align 8, !tbaa !9
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %23, ptr @last, align 8, !tbaa !5
  store i32 0, ptr %4, align 4
  br label %24

24:                                               ; preds = %14, %9
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  %25 = load i32, ptr %4, align 4
  switch i32 %25, label %27 [
    i32 0, label %26
    i32 1, label %26
  ]

26:                                               ; preds = %24, %24
  ret void

27:                                               ; preds = %24
  unreachable
}

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 }

!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, !6, i64 8}
!10 = !{!"Qnode", !6, i64 0, !6, i64 8}


; 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"

@last = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nounwind uwtable
declare dso_local ptr @createNode(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @enqueue(ptr noundef %0) local_unnamed_addr #0 {
  %2 = tail call ptr @createNode(ptr noundef %0)
  %3 = load ptr, ptr @last, align 8, !tbaa !5
  %4 = icmp eq ptr %3, null
  br i1 %4, label %5, label %7

5:                                                ; preds = %1
  %6 = getelementptr inbounds i8, ptr %2, i64 8
  br label %11

7:                                                ; preds = %1
  %8 = getelementptr inbounds i8, ptr %3, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !9
  %10 = getelementptr inbounds i8, ptr %2, i64 8
  store ptr %9, ptr %10, align 8, !tbaa !9
  br label %11

11:                                               ; preds = %7, %5
  %.sink = phi ptr [ %8, %7 ], [ %6, %5 ]
  store ptr %2, ptr %.sink, align 8, !tbaa !9
  store ptr %2, ptr @last, align 8
  ret void
}

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


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,MergedLoadStoreMotionPass,SROAPass,SimplifyCFGPass,TailCallElimPass