; LLVM IR from swifterfit/algorithm :: linkedList/linkedList (detectCycle)

; 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: nounwind uwtable
define dso_local ptr @detectCycle(ptr noundef %0) #0 {
  %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
  store ptr %0, ptr %3, align 8, !tbaa !5
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = icmp eq ptr %7, null
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  store ptr null, ptr %2, align 8
  br label %62

10:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %11, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %12, ptr %5, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %40, %10
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.listNode, ptr %14, i32 0, i32 1
  %16 = load ptr, ptr %15, align 8, !tbaa !9
  %17 = icmp ne ptr %16, null
  br i1 %17, label %18, label %25

18:                                               ; preds = %13
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.listNode, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  %22 = getelementptr inbounds %struct.listNode, ptr %21, i32 0, i32 1
  %23 = load ptr, ptr %22, align 8, !tbaa !9
  %24 = icmp ne ptr %23, null
  br label %25

25:                                               ; preds = %18, %13
  %26 = phi i1 [ false, %13 ], [ %24, %18 ]
  br i1 %26, label %27, label %41

27:                                               ; preds = %25
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.listNode, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !9
  store ptr %30, ptr %4, align 8, !tbaa !5
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.listNode, ptr %31, i32 0, i32 1
  %33 = load ptr, ptr %32, align 8, !tbaa !9
  %34 = getelementptr inbounds %struct.listNode, ptr %33, i32 0, i32 1
  %35 = load ptr, ptr %34, align 8, !tbaa !9
  store ptr %35, ptr %5, align 8, !tbaa !5
  %36 = load ptr, ptr %4, align 8, !tbaa !5
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = icmp eq ptr %36, %37
  br i1 %38, label %39, label %40

39:                                               ; preds = %27
  br label %41

40:                                               ; preds = %27
  br label %13, !llvm.loop !12

41:                                               ; preds = %39, %25
  %42 = load ptr, ptr %4, align 8, !tbaa !5
  %43 = load ptr, ptr %5, align 8, !tbaa !5
  %44 = icmp ne ptr %42, %43
  br i1 %44, label %45, label %46

45:                                               ; preds = %41
  store ptr null, ptr %2, align 8
  store i32 1, ptr %6, align 4
  br label %61

46:                                               ; preds = %41
  %47 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %47, ptr %5, align 8, !tbaa !5
  br label %48

48:                                               ; preds = %52, %46
  %49 = load ptr, ptr %5, align 8, !tbaa !5
  %50 = load ptr, ptr %4, align 8, !tbaa !5
  %51 = icmp ne ptr %49, %50
  br i1 %51, label %52, label %59

52:                                               ; preds = %48
  %53 = load ptr, ptr %4, 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 %4, align 8, !tbaa !5
  %56 = load ptr, ptr %5, 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 %5, align 8, !tbaa !5
  br label %48, !llvm.loop !14

59:                                               ; preds = %48
  %60 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %60, ptr %2, align 8
  store i32 1, ptr %6, align 4
  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
  br label %62

62:                                               ; preds = %61, %9
  %63 = load ptr, ptr %2, align 8
  ret ptr %63
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 {
  %2 = icmp eq ptr %0, null
  br i1 %2, label %.loopexit, label %.preheader31

.preheader31:                                     ; preds = %1, %8
  %.018 = phi ptr [ %10, %8 ], [ %0, %1 ]
  %.0 = phi ptr [ %7, %8 ], [ %0, %1 ]
  %3 = getelementptr inbounds i8, ptr %.0, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %.not = icmp eq ptr %4, null
  br i1 %.not, label %.critedge, label %5

5:                                                ; preds = %.preheader31
  %6 = getelementptr inbounds i8, ptr %4, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !5
  %.not28 = icmp eq ptr %7, null
  br i1 %.not28, label %.critedge, label %8

8:                                                ; preds = %5
  %9 = getelementptr inbounds i8, ptr %.018, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !5
  %11 = icmp eq ptr %10, %7
  br i1 %11, label %.critedge, label %.preheader31, !llvm.loop !11

.critedge:                                        ; preds = %.preheader31, %8, %5
  %.119 = phi ptr [ %10, %8 ], [ %.018, %5 ], [ %.018, %.preheader31 ]
  %.1 = phi ptr [ %7, %8 ], [ %.0, %5 ], [ %.0, %.preheader31 ]
  %.not29 = icmp eq ptr %.119, %.1
  br i1 %.not29, label %.preheader, label %.loopexit

.preheader:                                       ; preds = %.critedge
  %.not3032 = icmp eq ptr %.119, %0
  br i1 %.not3032, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.234 = phi ptr [ %15, %.lr.ph ], [ %0, %.preheader ]
  %.22033 = phi ptr [ %13, %.lr.ph ], [ %.119, %.preheader ]
  %12 = getelementptr inbounds i8, ptr %.22033, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %.234, i64 8
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  %.not30 = icmp eq ptr %15, %13
  br i1 %.not30, label %.loopexit, label %.lr.ph, !llvm.loop !13

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %.critedge, %1
  %.122 = phi ptr [ null, %1 ], [ null, %.critedge ], [ %0, %.preheader ], [ %15, %.lr.ph ]
  ret ptr %.122
}

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: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass