; LLVM IR from JessonYue/LeetCodeLearning :: Array/zhangjunwei/6_26环路检测 (detectCycle_6_26)

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

10:                                               ; preds = %36, %1
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = icmp ne ptr %11, null
  br i1 %12, label %13, label %21

13:                                               ; preds = %10
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = icmp ne ptr %14, null
  br i1 %15, label %16, label %21

16:                                               ; preds = %13
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.ListNode, ptr %17, i32 0, i32 1
  %19 = load ptr, ptr %18, align 8, !tbaa !9
  %20 = icmp ne ptr %19, null
  br label %21

21:                                               ; preds = %16, %13, %10
  %22 = phi i1 [ false, %13 ], [ false, %10 ], [ %20, %16 ]
  br i1 %22, label %23, label %37

23:                                               ; preds = %21
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.ListNode, ptr %24, i32 0, i32 1
  %26 = load ptr, ptr %25, align 8, !tbaa !9
  store ptr %26, ptr %5, align 8, !tbaa !5
  %27 = load ptr, ptr %4, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.ListNode, ptr %27, i32 0, i32 1
  %29 = load ptr, ptr %28, align 8, !tbaa !9
  %30 = getelementptr inbounds %struct.ListNode, ptr %29, i32 0, i32 1
  %31 = load ptr, ptr %30, align 8, !tbaa !9
  store ptr %31, ptr %4, align 8, !tbaa !5
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = load ptr, ptr %4, align 8, !tbaa !5
  %34 = icmp eq ptr %32, %33
  br i1 %34, label %35, label %36

35:                                               ; preds = %23
  br label %37

36:                                               ; preds = %23
  br label %10, !llvm.loop !12

37:                                               ; preds = %35, %21
  %38 = load ptr, ptr %4, align 8, !tbaa !5
  %39 = icmp eq ptr %38, null
  br i1 %39, label %45, label %40

40:                                               ; preds = %37
  %41 = load ptr, ptr %4, align 8, !tbaa !5
  %42 = getelementptr inbounds %struct.ListNode, ptr %41, i32 0, i32 1
  %43 = load ptr, ptr %42, align 8, !tbaa !9
  %44 = icmp eq ptr %43, null
  br i1 %44, label %45, label %46

45:                                               ; preds = %40, %37
  store ptr null, ptr %2, align 8
  store i32 1, ptr %6, align 4
  br label %61

46:                                               ; preds = %40
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %47 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %47, ptr %7, align 8, !tbaa !5
  br label %48

48:                                               ; preds = %52, %46
  %49 = load ptr, ptr %5, align 8, !tbaa !5
  %50 = load ptr, ptr %7, align 8, !tbaa !5
  %51 = icmp ne ptr %49, %50
  br i1 %51, label %52, label %59

52:                                               ; preds = %48
  %53 = load ptr, ptr %5, align 8, !tbaa !5
  %54 = getelementptr inbounds %struct.ListNode, ptr %53, i32 0, i32 1
  %55 = load ptr, ptr %54, align 8, !tbaa !9
  store ptr %55, ptr %5, align 8, !tbaa !5
  %56 = load ptr, ptr %7, align 8, !tbaa !5
  %57 = getelementptr inbounds %struct.ListNode, ptr %56, i32 0, i32 1
  %58 = load ptr, ptr %57, align 8, !tbaa !9
  store ptr %58, ptr %7, align 8, !tbaa !5
  br label %48, !llvm.loop !14

59:                                               ; preds = %48
  %60 = load ptr, ptr %7, align 8, !tbaa !5
  store ptr %60, ptr %2, align 8
  store i32 1, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  br label %61

61:                                               ; preds = %59, %45
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %62 = load ptr, ptr %2, align 8
  ret ptr %62
}

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 = !{!"ListNode", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}


; 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: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local ptr @detectCycle(ptr noundef readonly %0) local_unnamed_addr #0 {
  br label %2

2:                                                ; preds = %8, %1
  %.020 = phi ptr [ %0, %1 ], [ %12, %8 ]
  %.019 = phi ptr [ %0, %1 ], [ %10, %8 ]
  %3 = icmp ne ptr %.019, null
  %4 = icmp ne ptr %.020, null
  %or.cond = and i1 %4, %3
  br i1 %or.cond, label %5, label %.critedge

5:                                                ; preds = %2
  %6 = getelementptr inbounds i8, ptr %.020, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !5
  %.not = icmp eq ptr %7, null
  br i1 %.not, label %.loopexit, label %8

8:                                                ; preds = %5
  %9 = getelementptr inbounds i8, ptr %.019, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !5
  %11 = getelementptr inbounds i8, ptr %7, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !5
  %13 = icmp eq ptr %10, %12
  br i1 %13, label %.critedge, label %2, !llvm.loop !11

.critedge:                                        ; preds = %2, %8
  %.121 = phi ptr [ %12, %8 ], [ %.020, %2 ]
  %.1 = phi ptr [ %10, %8 ], [ %.019, %2 ]
  %14 = icmp eq ptr %.121, null
  br i1 %14, label %.loopexit, label %.critedge.thread

.critedge.thread:                                 ; preds = %.critedge
  %.phi.trans.insert = getelementptr inbounds i8, ptr %.121, i64 8
  %.pre = load ptr, ptr %.phi.trans.insert, align 8, !tbaa !5
  %15 = icmp eq ptr %.pre, null
  br i1 %15, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %.critedge.thread
  %.not2835 = icmp eq ptr %.1, %0
  br i1 %.not2835, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.037 = phi ptr [ %19, %.lr.ph ], [ %0, %.preheader ]
  %.236 = phi ptr [ %17, %.lr.ph ], [ %.1, %.preheader ]
  %16 = getelementptr inbounds i8, ptr %.236, i64 8
  %17 = load ptr, ptr %16, align 8, !tbaa !5
  %18 = getelementptr inbounds i8, ptr %.037, i64 8
  %19 = load ptr, ptr %18, align 8, !tbaa !5
  %.not28 = icmp eq ptr %17, %19
  br i1 %.not28, label %.loopexit, label %.lr.ph, !llvm.loop !13

.loopexit:                                        ; preds = %5, %.lr.ph, %.preheader, %.critedge, %.critedge.thread
  %.022 = phi ptr [ null, %.critedge.thread ], [ null, %.critedge ], [ %0, %.preheader ], [ %19, %.lr.ph ], [ null, %5 ]
  ret ptr %.022
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) 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, !10, i64 8}
!6 = !{!"ListNode", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; Effective O3 passes: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass