; LLVM IR from nonstriater/Learn-Algorithms :: 4 Tree/1-二叉树 /btree (bintree)

; 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 }
%struct.Queue = type { ptr, ptr, i32 }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #1

; 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 i32 @enQueue(ptr noundef %0, ptr noundef %1) #2 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %8 = call noalias ptr @malloc(i64 noundef 16) #4
  store ptr %8, ptr %6, align 8, !tbaa !5
  %9 = load ptr, ptr %6, align 8, !tbaa !5
  %10 = icmp ne ptr %9, null
  br i1 %10, label %12, label %11

11:                                               ; preds = %2
  store i32 0, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %30

12:                                               ; preds = %2
  %13 = load ptr, ptr %5, align 8, !tbaa !5
  %14 = load ptr, ptr %6, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.QNode, ptr %14, i32 0, i32 1
  store ptr %13, ptr %15, align 8, !tbaa !9
  %16 = load ptr, ptr %6, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.QNode, ptr %16, i32 0, i32 0
  store ptr null, ptr %17, align 8, !tbaa !11
  %18 = load ptr, ptr %6, align 8, !tbaa !5
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.Queue, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !12
  %22 = getelementptr inbounds %struct.QNode, ptr %21, i32 0, i32 0
  store ptr %18, ptr %22, align 8, !tbaa !11
  %23 = load ptr, ptr %6, align 8, !tbaa !5
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.Queue, ptr %24, i32 0, i32 1
  store ptr %23, ptr %25, align 8, !tbaa !12
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.Queue, ptr %26, i32 0, i32 2
  %28 = load i32, ptr %27, align 8, !tbaa !15
  %29 = add nsw i32 %28, 1
  store i32 %29, ptr %27, align 8, !tbaa !15
  store i32 1, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %30

30:                                               ; preds = %12, %11
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  %31 = load i32, ptr %3, align 4
  ret i32 %31
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 #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, !6, i64 8}
!10 = !{!"QNode", !6, i64 0, !6, i64 8}
!11 = !{!10, !6, i64 0}
!12 = !{!13, !6, i64 8}
!13 = !{!"", !6, i64 0, !6, i64 8, !14, i64 16}
!14 = !{!"int", !7, i64 0}
!15 = !{!13, !14, 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: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nofree nounwind willreturn memory(write, argmem: readwrite, inaccessiblemem: readwrite) uwtable
define dso_local range(i32 0, 2) i32 @enQueue(ptr nocapture noundef %0, ptr noundef %1) local_unnamed_addr #1 {
  %3 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #2
  %.not = icmp eq ptr %3, null
  br i1 %.not, label %11, label %4

4:                                                ; preds = %2
  %5 = getelementptr inbounds i8, ptr %3, i64 8
  store ptr %1, ptr %5, align 8, !tbaa !5
  store ptr null, ptr %3, align 8, !tbaa !10
  %6 = getelementptr inbounds i8, ptr %0, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !11
  store ptr %3, ptr %7, align 8, !tbaa !10
  store ptr %3, ptr %6, align 8, !tbaa !11
  %8 = getelementptr inbounds i8, ptr %0, i64 16
  %9 = load i32, ptr %8, align 8, !tbaa !14
  %10 = add nsw i32 %9, 1
  store i32 %10, ptr %8, align 8, !tbaa !14
  br label %11

11:                                               ; preds = %2, %4
  %.0 = phi i32 [ 1, %4 ], [ 0, %2 ]
  ret i32 %.0
}

attributes #0 = { 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 #1 = { mustprogress nofree nounwind willreturn memory(write, argmem: readwrite, inaccessiblemem: readwrite) 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 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, !7, i64 8}
!6 = !{!"QNode", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!6, !7, i64 0}
!11 = !{!12, !7, i64 8}
!12 = !{!"", !7, i64 0, !7, i64 8, !13, i64 16}
!13 = !{!"int", !8, i64 0}
!14 = !{!12, !13, i64 16}


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