; LLVM IR from xxks-kkk/algo :: linkedList/lazy-deletion (lazyDeleteLinkedList)

; 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.Node = type { i32, ptr, i32 }

@numNodes = external hidden global i32, align 4
@numDeleted = external hidden global i32, align 4

; 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 void @deleteNode(i32 noundef %0, ptr noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store i32 %0, ptr %3, align 4, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %7 = load ptr, ptr %4, align 8, !tbaa !9
  %8 = getelementptr inbounds %struct.Node, ptr %7, i32 0, i32 1
  %9 = load ptr, ptr %8, align 8, !tbaa !11
  store ptr %9, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %10 = load ptr, ptr %4, align 8, !tbaa !9
  store ptr %10, ptr %6, align 8, !tbaa !9
  br label %11

11:                                               ; preds = %26, %2
  %12 = load ptr, ptr %5, align 8, !tbaa !9
  %13 = icmp ne ptr %12, null
  br i1 %13, label %14, label %31

14:                                               ; preds = %11
  %15 = load ptr, ptr %5, align 8, !tbaa !9
  %16 = getelementptr inbounds %struct.Node, ptr %15, i32 0, i32 0
  %17 = load i32, ptr %16, align 8, !tbaa !13
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = icmp eq i32 %17, %18
  br i1 %19, label %20, label %25

20:                                               ; preds = %14
  %21 = load ptr, ptr %5, align 8, !tbaa !9
  %22 = getelementptr inbounds %struct.Node, ptr %21, i32 0, i32 2
  store i32 1, ptr %22, align 8, !tbaa !14
  %23 = load i32, ptr @numDeleted, align 4, !tbaa !5
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr @numDeleted, align 4, !tbaa !5
  br label %25

25:                                               ; preds = %20, %14
  br label %26

26:                                               ; preds = %25
  %27 = load ptr, ptr %5, align 8, !tbaa !9
  store ptr %27, ptr %6, align 8, !tbaa !9
  %28 = load ptr, ptr %5, align 8, !tbaa !9
  %29 = getelementptr inbounds %struct.Node, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !11
  store ptr %30, ptr %5, align 8, !tbaa !9
  br label %11, !llvm.loop !15

31:                                               ; preds = %11
  %32 = load i32, ptr @numDeleted, align 4, !tbaa !5
  %33 = load i32, ptr @numNodes, align 4, !tbaa !5
  %34 = load i32, ptr @numDeleted, align 4, !tbaa !5
  %35 = sub nsw i32 %33, %34
  %36 = icmp eq i32 %32, %35
  br i1 %36, label %37, label %39

37:                                               ; preds = %31
  %38 = load ptr, ptr %4, align 8, !tbaa !9
  call void @deleteMarkedNodes(ptr noundef %38)
  br label %39

39:                                               ; preds = %37, %31
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret void
}

; Function Attrs: nounwind uwtable
declare dso_local void @deleteMarkedNodes(ptr noundef) #1

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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !10, i64 8}
!12 = !{!"Node", !6, i64 0, !10, i64 8, !6, i64 16}
!13 = !{!12, !6, i64 0}
!14 = !{!12, !6, i64 16}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


; 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"

@numNodes = external hidden local_unnamed_addr global i32, align 4
@numDeleted = external hidden local_unnamed_addr global i32, align 4

; Function Attrs: nounwind uwtable
define dso_local void @deleteNode(i32 noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %numDeleted.promoted = load i32, ptr @numDeleted, align 4, !tbaa !5
  %.0.in8 = getelementptr inbounds i8, ptr %1, i64 8
  %.09 = load ptr, ptr %.0.in8, align 8, !tbaa !9
  %.not10 = icmp eq ptr %.09, null
  br i1 %.not10, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %9
  %.011 = phi ptr [ %.0, %9 ], [ %.09, %2 ]
  %3 = phi i32 [ %10, %9 ], [ %numDeleted.promoted, %2 ]
  %4 = load i32, ptr %.011, align 8, !tbaa !12
  %5 = icmp eq i32 %4, %0
  br i1 %5, label %6, label %9

6:                                                ; preds = %.lr.ph
  %7 = getelementptr inbounds i8, ptr %.011, i64 16
  store i32 1, ptr %7, align 8, !tbaa !13
  %8 = add nsw i32 %3, 1
  store i32 %8, ptr @numDeleted, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %.lr.ph, %6
  %10 = phi i32 [ %3, %.lr.ph ], [ %8, %6 ]
  %.0.in = getelementptr inbounds i8, ptr %.011, i64 8
  %.0 = load ptr, ptr %.0.in, align 8, !tbaa !9
  %.not = icmp eq ptr %.0, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !14

._crit_edge:                                      ; preds = %9, %2
  %11 = phi i32 [ %numDeleted.promoted, %2 ], [ %10, %9 ]
  %12 = load i32, ptr @numNodes, align 4, !tbaa !5
  %13 = sub nsw i32 %12, %11
  %14 = icmp eq i32 %11, %13
  br i1 %14, label %15, label %16

15:                                               ; preds = %._crit_edge
  tail call void @deleteMarkedNodes(ptr noundef %1)
  br label %16

16:                                               ; preds = %15, %._crit_edge
  ret void
}

; Function Attrs: nounwind uwtable
declare dso_local void @deleteMarkedNodes(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, !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 = !{!"Node", !6, i64 0, !11, i64 8, !6, i64 16}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!10, !6, i64 0}
!13 = !{!10, !6, i64 16}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass