; LLVM IR from VastoLorde95/Competitive-Programming :: Codeforces/254 Division 2/Problem B/B.ll (Z6sccompv)

; 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"

%"class.std::stack" = type { %"class.std::deque" }
%"class.std::deque" = type { %"class.std::_Deque_base" }
%"class.std::_Deque_base" = type { %"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl" }
%"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl" = type { %"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl_data" }
%"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl_data" = type { ptr, i64, %"struct.std::_Deque_iterator", %"struct.std::_Deque_iterator" }
%"struct.std::_Deque_iterator" = type { ptr, ptr, ptr, ptr }

@n = external dso_local global i64, align 8
@visited = external dso_local global [51 x i32], align 16
@comp = external dso_local global i32, align 4
@s = external dso_local global %"class.std::stack", align 8

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3dfsi(i32 noundef) #0

; 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

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4dfs2ii(i32 noundef, i32 noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z6sccompv() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  store i32 0, ptr %1, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %19, %0
  %5 = load i32, ptr %1, align 4, !tbaa !5
  %6 = sext i32 %5 to i64
  %7 = load i64, ptr @n, align 8, !tbaa !9
  %8 = icmp slt i64 %6, %7
  br i1 %8, label %10, label %9

9:                                                ; preds = %4
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  br label %22

10:                                               ; preds = %4
  %11 = load i32, ptr %1, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [51 x i32], ptr @visited, i64 0, i64 %12
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = icmp ne i32 %14, 0
  br i1 %15, label %18, label %16

16:                                               ; preds = %10
  %17 = load i32, ptr %1, align 4, !tbaa !5
  call void @_Z3dfsi(i32 noundef %17)
  br label %18

18:                                               ; preds = %16, %10
  br label %19

19:                                               ; preds = %18
  %20 = load i32, ptr %1, align 4, !tbaa !5
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr %1, align 4, !tbaa !5
  br label %4, !llvm.loop !11

22:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %23

23:                                               ; preds = %33, %22
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = sext i32 %24 to i64
  %26 = load i64, ptr @n, align 8, !tbaa !9
  %27 = icmp slt i64 %25, %26
  br i1 %27, label %29, label %28

28:                                               ; preds = %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %36

29:                                               ; preds = %23
  %30 = load i32, ptr %3, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds [51 x i32], ptr @visited, i64 0, i64 %31
  store i32 0, ptr %32, align 4, !tbaa !5
  br label %33

33:                                               ; preds = %29
  %34 = load i32, ptr %3, align 4, !tbaa !5
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %3, align 4, !tbaa !5
  br label %23, !llvm.loop !13

36:                                               ; preds = %28
  br label %37

37:                                               ; preds = %49, %48, %36
  %38 = call noundef zeroext i1 @_ZNKSt5stackIiSt5dequeIiSaIiEEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) @s)
  %39 = xor i1 %38, true
  br i1 %39, label %40, label %54

40:                                               ; preds = %37
  %41 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt5stackIiSt5dequeIiSaIiEEE3topEv(ptr noundef nonnull align 8 dereferenceable(80) @s)
  %42 = load i32, ptr %41, align 4, !tbaa !5
  store i32 %42, ptr %2, align 4, !tbaa !5
  call void @_ZNSt5stackIiSt5dequeIiSaIiEEE3popEv(ptr noundef nonnull align 8 dereferenceable(80) @s)
  %43 = load i32, ptr %2, align 4, !tbaa !5
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds [51 x i32], ptr @visited, i64 0, i64 %44
  %46 = load i32, ptr %45, align 4, !tbaa !5
  %47 = icmp eq i32 %46, 1
  br i1 %47, label %48, label %49

48:                                               ; preds = %40
  br label %37, !llvm.loop !14

49:                                               ; preds = %40
  %50 = load i32, ptr %2, align 4, !tbaa !5
  %51 = load i32, ptr @comp, align 4, !tbaa !5
  call void @_Z4dfs2ii(i32 noundef %50, i32 noundef %51)
  %52 = load i32, ptr @comp, align 4, !tbaa !5
  %53 = add nsw i32 %52, 1
  store i32 %53, ptr @comp, align 4, !tbaa !5
  br label %37, !llvm.loop !14

54:                                               ; preds = %37
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt5stackIiSt5dequeIiSaIiEEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt5stackIiSt5dequeIiSaIiEEE3topEv(ptr noundef nonnull align 8 dereferenceable(80)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt5stackIiSt5dequeIiSaIiEEE3popEv(ptr noundef nonnull align 8 dereferenceable(80)) #2 align 2

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { mustprogress 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 }

!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 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}
!14 = distinct !{!14, !12}


; 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"

%"class.std::stack" = type { %"class.std::deque" }
%"class.std::deque" = type { %"class.std::_Deque_base" }
%"class.std::_Deque_base" = type { %"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl" }
%"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl" = type { %"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl_data" }
%"struct.std::_Deque_base<int, std::allocator<int>>::_Deque_impl_data" = type { ptr, i64, %"struct.std::_Deque_iterator", %"struct.std::_Deque_iterator" }
%"struct.std::_Deque_iterator" = type { ptr, ptr, ptr, ptr }

@n = external dso_local local_unnamed_addr global i64, align 8
@visited = external dso_local local_unnamed_addr global [51 x i32], align 16
@comp = external dso_local local_unnamed_addr global i32, align 4
@s = external dso_local global %"class.std::stack", align 8

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3dfsi(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4dfs2ii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z6sccompv() local_unnamed_addr #0 {
  %1 = load i64, ptr @n, align 8, !tbaa !5
  %2 = icmp sgt i64 %1, 0
  br i1 %2, label %.lr.ph, label %.preheader

.preheader12:                                     ; preds = %10
  %3 = icmp sgt i64 %11, 0
  br i1 %3, label %.lr.ph15.preheader, label %.preheader

.lr.ph15.preheader:                               ; preds = %.preheader12
  %4 = shl nuw i64 %11, 2
  tail call void @llvm.memset.p0.i64(ptr nonnull align 16 @visited, i8 0, i64 %4, i1 false), !tbaa !9
  br label %.preheader

.lr.ph:                                           ; preds = %0, %10
  %5 = phi i64 [ %11, %10 ], [ %1, %0 ]
  %indvars.iv = phi i64 [ %indvars.iv.next, %10 ], [ 0, %0 ]
  %6 = getelementptr inbounds [51 x i32], ptr @visited, i64 0, i64 %indvars.iv
  %7 = load i32, ptr %6, align 4, !tbaa !9
  %.not = icmp eq i32 %7, 0
  br i1 %.not, label %8, label %10

8:                                                ; preds = %.lr.ph
  %9 = trunc nuw nsw i64 %indvars.iv to i32
  tail call void @_Z3dfsi(i32 noundef %9)
  %.pre = load i64, ptr @n, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %.lr.ph, %8
  %11 = phi i64 [ %5, %.lr.ph ], [ %.pre, %8 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %12 = icmp sgt i64 %11, %indvars.iv.next
  br i1 %12, label %.lr.ph, label %.preheader12, !llvm.loop !11

.preheader:                                       ; preds = %0, %.lr.ph15.preheader, %.preheader12
  %13 = tail call noundef zeroext i1 @_ZNKSt5stackIiSt5dequeIiSaIiEEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) @s)
  br i1 %13, label %._crit_edge, label %.lr.ph16

.lr.ph16:                                         ; preds = %.preheader, %.backedge
  %14 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt5stackIiSt5dequeIiSaIiEEE3topEv(ptr noundef nonnull align 8 dereferenceable(80) @s)
  %15 = load i32, ptr %14, align 4, !tbaa !9
  tail call void @_ZNSt5stackIiSt5dequeIiSaIiEEE3popEv(ptr noundef nonnull align 8 dereferenceable(80) @s)
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [51 x i32], ptr @visited, i64 0, i64 %16
  %18 = load i32, ptr %17, align 4, !tbaa !9
  %19 = icmp eq i32 %18, 1
  br i1 %19, label %.backedge, label %20

20:                                               ; preds = %.lr.ph16
  %21 = load i32, ptr @comp, align 4, !tbaa !9
  tail call void @_Z4dfs2ii(i32 noundef %15, i32 noundef %21)
  %22 = load i32, ptr @comp, align 4, !tbaa !9
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr @comp, align 4, !tbaa !9
  br label %.backedge

.backedge:                                        ; preds = %20, %.lr.ph16
  %24 = tail call noundef zeroext i1 @_ZNKSt5stackIiSt5dequeIiSaIiEEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) @s)
  br i1 %24, label %._crit_edge, label %.lr.ph16, !llvm.loop !13

._crit_edge:                                      ; preds = %.backedge, %.preheader
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt5stackIiSt5dequeIiSaIiEEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt5stackIiSt5dequeIiSaIiEEE3topEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt5stackIiSt5dequeIiSaIiEEE3popEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #1 align 2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

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 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 = { nocallback nofree nounwind willreturn memory(argmem: write) }

!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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


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