; LLVM IR from lzyrapx/Competitive-Programming :: LibreOJ (109（并查集）)

; 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"

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@fa = external dso_local global [8000010 x i32], align 16
@ans = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [7 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z9getfatheri(i32 noundef) #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #1 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  %11 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n, ptr noundef @m)
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  store i32 1, ptr %5, align 4, !tbaa !5
  br label %12

12:                                               ; preds = %22, %0
  %13 = load i32, ptr %5, align 4, !tbaa !5
  %14 = load i32, ptr @n, align 4, !tbaa !5
  %15 = icmp sle i32 %13, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  br label %25

17:                                               ; preds = %12
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = load i32, ptr %5, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [8000010 x i32], ptr @fa, i64 0, i64 %20
  store i32 %18, ptr %21, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %17
  %23 = load i32, ptr %5, align 4, !tbaa !5
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr %5, align 4, !tbaa !5
  br label %12, !llvm.loop !9

25:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  store i32 1, ptr %6, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %71, %25
  %27 = load i32, ptr %6, align 4, !tbaa !5
  %28 = load i32, ptr @m, align 4, !tbaa !5
  %29 = icmp sle i32 %27, %28
  br i1 %29, label %31, label %30

30:                                               ; preds = %26
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  br label %74

31:                                               ; preds = %26
  %32 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %2, ptr noundef %3, ptr noundef %4)
  %33 = load i32, ptr %2, align 4, !tbaa !5
  %34 = icmp eq i32 %33, 0
  br i1 %34, label %35, label %49

35:                                               ; preds = %31
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  %36 = load i32, ptr %3, align 4, !tbaa !5
  %37 = call noundef i32 @_Z9getfatheri(i32 noundef %36)
  store i32 %37, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #4
  %38 = load i32, ptr %4, align 4, !tbaa !5
  %39 = call noundef i32 @_Z9getfatheri(i32 noundef %38)
  store i32 %39, ptr %8, align 4, !tbaa !5
  %40 = load i32, ptr %7, align 4, !tbaa !5
  %41 = load i32, ptr %8, align 4, !tbaa !5
  %42 = icmp ne i32 %40, %41
  br i1 %42, label %43, label %48

43:                                               ; preds = %35
  %44 = load i32, ptr %8, align 4, !tbaa !5
  %45 = load i32, ptr %7, align 4, !tbaa !5
  %46 = sext i32 %45 to i64
  %47 = getelementptr inbounds [8000010 x i32], ptr @fa, i64 0, i64 %46
  store i32 %44, ptr %47, align 4, !tbaa !5
  br label %48

48:                                               ; preds = %43, %35
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %70

49:                                               ; preds = %31
  %50 = load i32, ptr %2, align 4, !tbaa !5
  %51 = icmp eq i32 %50, 1
  br i1 %51, label %52, label %69

52:                                               ; preds = %49
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #4
  %53 = load i32, ptr %3, align 4, !tbaa !5
  %54 = call noundef i32 @_Z9getfatheri(i32 noundef %53)
  store i32 %54, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #4
  %55 = load i32, ptr %4, align 4, !tbaa !5
  %56 = call noundef i32 @_Z9getfatheri(i32 noundef %55)
  store i32 %56, ptr %10, align 4, !tbaa !5
  %57 = load i32, ptr %9, align 4, !tbaa !5
  %58 = load i32, ptr %10, align 4, !tbaa !5
  %59 = icmp eq i32 %57, %58
  br i1 %59, label %60, label %65

60:                                               ; preds = %52
  %61 = load i32, ptr @ans, align 4, !tbaa !5
  %62 = mul nsw i32 %61, 2
  %63 = add nsw i32 %62, 1
  %64 = srem i32 %63, 998244353
  store i32 %64, ptr @ans, align 4, !tbaa !5
  br label %68

65:                                               ; preds = %52
  %66 = load i32, ptr @ans, align 4, !tbaa !5
  %67 = mul nsw i32 %66, 2
  store i32 %67, ptr @ans, align 4, !tbaa !5
  br label %68

68:                                               ; preds = %65, %60
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #4
  br label %69

69:                                               ; preds = %68, %49
  br label %70

70:                                               ; preds = %69, %48
  br label %71

71:                                               ; preds = %70
  %72 = load i32, ptr %6, align 4, !tbaa !5
  %73 = add nsw i32 %72, 1
  store i32 %73, ptr %6, align 4, !tbaa !5
  br label %26, !llvm.loop !11

74:                                               ; preds = %30
  %75 = load i32, ptr @ans, align 4, !tbaa !5
  %76 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %75)
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  %77 = load i32, ptr %1, align 4
  ret i32 %77
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

declare i32 @__isoc99_scanf(ptr noundef, ...) #3

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

declare i32 @printf(ptr noundef, ...) #3

attributes #0 = { mustprogress 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 = { mustprogress norecurse 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { "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 #4 = { 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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; 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"

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@fa = external dso_local local_unnamed_addr global [8000010 x i32], align 16
@ans = external dso_local local_unnamed_addr global i32, align 4
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [7 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z9getfatheri(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #4
  %4 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n, ptr noundef nonnull @m)
  %5 = load i32, ptr @n, align 4, !tbaa !5
  %.not19 = icmp slt i32 %5, 1
  br i1 %.not19, label %.preheader, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %0
  %6 = add nuw i32 %5, 1
  %wide.trip.count = zext i32 %6 to i64
  %7 = zext nneg i32 %5 to i64
  %min.iters.check = icmp ult i32 %5, 8
  br i1 %min.iters.check, label %.lr.ph.preheader26, label %vector.ph

.lr.ph.preheader26:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 1, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  br label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %7, 2147483640
  %ind.end = or disjoint i64 %n.vec, 1
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.ind = phi <4 x i32> [ <i32 1, i32 2, i32 3, i32 4>, %vector.ph ], [ %vec.ind.next, %vector.body ]
  %step.add = add <4 x i32> %vec.ind, <i32 4, i32 4, i32 4, i32 4>
  %offset.idx = or disjoint i64 %index, 1
  %8 = getelementptr inbounds [8000010 x i32], ptr @fa, i64 0, i64 %offset.idx
  %9 = getelementptr inbounds i8, ptr %8, i64 16
  store <4 x i32> %vec.ind, ptr %8, align 4, !tbaa !5
  store <4 x i32> %step.add, ptr %9, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %vec.ind.next = add <4 x i32> %vec.ind, <i32 8, i32 8, i32 8, i32 8>
  %10 = icmp eq i64 %index.next, %n.vec
  br i1 %10, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %7
  br i1 %cmp.n, label %.preheader, label %.lr.ph.preheader26

.preheader:                                       ; preds = %.lr.ph, %middle.block, %0
  %11 = load i32, ptr @m, align 4, !tbaa !5
  %.not1721 = icmp slt i32 %11, 1
  br i1 %.not1721, label %._crit_edge, label %.lr.ph23

.lr.ph:                                           ; preds = %.lr.ph.preheader26, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader26 ]
  %12 = getelementptr inbounds [8000010 x i32], ptr @fa, i64 0, i64 %indvars.iv
  %13 = trunc nuw nsw i64 %indvars.iv to i32
  store i32 %13, ptr %12, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %.preheader, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %38, %.preheader
  %14 = load i32, ptr @ans, align 4, !tbaa !5
  %15 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %14)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #4
  ret i32 0

.lr.ph23:                                         ; preds = %.preheader, %38
  %.01322 = phi i32 [ %39, %38 ], [ 1, %.preheader ]
  %16 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %1, ptr noundef nonnull %2, ptr noundef nonnull %3)
  %17 = load i32, ptr %1, align 4, !tbaa !5
  switch i32 %17, label %38 [
    i32 0, label %18
    i32 1, label %26
  ]

18:                                               ; preds = %.lr.ph23
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = call noundef i32 @_Z9getfatheri(i32 noundef %19)
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = call noundef i32 @_Z9getfatheri(i32 noundef %21)
  %.not18 = icmp eq i32 %20, %22
  br i1 %.not18, label %38, label %23

23:                                               ; preds = %18
  %24 = sext i32 %20 to i64
  %25 = getelementptr inbounds [8000010 x i32], ptr @fa, i64 0, i64 %24
  store i32 %22, ptr %25, align 4, !tbaa !5
  br label %38

26:                                               ; preds = %.lr.ph23
  %27 = load i32, ptr %2, align 4, !tbaa !5
  %28 = call noundef i32 @_Z9getfatheri(i32 noundef %27)
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = call noundef i32 @_Z9getfatheri(i32 noundef %29)
  %31 = icmp eq i32 %28, %30
  %32 = load i32, ptr @ans, align 4, !tbaa !5
  %33 = shl nsw i32 %32, 1
  br i1 %31, label %34, label %37

34:                                               ; preds = %26
  %35 = or disjoint i32 %33, 1
  %36 = srem i32 %35, 998244353
  br label %37

37:                                               ; preds = %26, %34
  %storemerge = phi i32 [ %36, %34 ], [ %33, %26 ]
  store i32 %storemerge, ptr @ans, align 4, !tbaa !5
  br label %38

38:                                               ; preds = %.lr.ph23, %18, %23, %37
  %39 = add nuw nsw i32 %.01322, 1
  %40 = load i32, ptr @m, align 4, !tbaa !5
  %.not17.not = icmp slt i32 %.01322, %40
  br i1 %.not17.not, label %.lr.ph23, label %._crit_edge, !llvm.loop !14
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

attributes #0 = { mustprogress 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 = { mustprogress norecurse 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { nofree nounwind "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 #4 = { 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++ TBAA"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}
!14 = distinct !{!14, !10}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass