; LLVM IR from tangjz/acm-icpc :: codeforces/gym/101955A.ll (Z3dfsi)

; 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::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" = type { ptr, ptr, ptr }

@tot = external dso_local global i32, align 4
@val = external dso_local global [20001 x i32], align 16
@son = external dso_local global [20001 x [27 x i32]], align 16
@typ = external dso_local global [4001 x i32], align 16
@e = external dso_local global [4001 x %"class.std::vector"], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z3dfsi(i32 noundef %0) #1 personality ptr @__gxx_personality_v0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca %"class.std::vector", align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 24, ptr %4) #3
  call void @_ZNSt6vectorIiSaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(24) %4) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %10

10:                                               ; preds = %35, %1
  %11 = load i32, ptr %5, align 4, !tbaa !5
  %12 = icmp slt i32 %11, 26
  br i1 %12, label %14, label %13

13:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  br label %42

14:                                               ; preds = %10
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [20001 x [27 x i32]], ptr @son, i64 0, i64 %16
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [27 x i32], ptr %17, i64 0, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = icmp ne i32 %21, 0
  br i1 %22, label %24, label %23

23:                                               ; preds = %14
  br label %35

24:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %25 = load i32, ptr %3, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [20001 x [27 x i32]], ptr @son, i64 0, i64 %26
  %28 = load i32, ptr %5, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [27 x i32], ptr %27, i64 0, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !5
  %32 = invoke noundef i32 @_Z3dfsi(i32 noundef %31)
          to label %33 unwind label %38

33:                                               ; preds = %24
  store i32 %32, ptr %6, align 4, !tbaa !5
  invoke void @_ZNSt6vectorIiSaIiEE9push_backEOi(ptr noundef nonnull align 8 dereferenceable(24) %4, ptr noundef nonnull align 4 dereferenceable(4) %6)
          to label %34 unwind label %38

34:                                               ; preds = %33
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %35

35:                                               ; preds = %34, %23
  %36 = load i32, ptr %5, align 4, !tbaa !5
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %5, align 4, !tbaa !5
  br label %10, !llvm.loop !9

38:                                               ; preds = %33, %24
  %39 = landingpad { ptr, i32 }
          cleanup
  %40 = extractvalue { ptr, i32 } %39, 0
  store ptr %40, ptr %7, align 8
  %41 = extractvalue { ptr, i32 } %39, 1
  store i32 %41, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  call void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %4) #3
  call void @llvm.lifetime.end.p0(i64 24, ptr %4) #3
  br label %69

42:                                               ; preds = %13
  %43 = load i32, ptr %3, align 4, !tbaa !5
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds [20001 x i32], ptr @val, i64 0, i64 %44
  %46 = load i32, ptr %45, align 4, !tbaa !5
  %47 = icmp ne i32 %46, 0
  br i1 %47, label %54, label %48

48:                                               ; preds = %42
  %49 = call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %4) #3
  %50 = icmp eq i64 %49, 1
  br i1 %50, label %51, label %54

51:                                               ; preds = %48
  %52 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEE4backEv(ptr noundef nonnull align 8 dereferenceable(24) %4) #3
  %53 = load i32, ptr %52, align 4, !tbaa !5
  store i32 %53, ptr %2, align 4
  store i32 1, ptr %9, align 4
  br label %67

54:                                               ; preds = %48, %42
  %55 = load i32, ptr %3, align 4, !tbaa !5
  %56 = sext i32 %55 to i64
  %57 = getelementptr inbounds [20001 x i32], ptr @val, i64 0, i64 %56
  %58 = load i32, ptr %57, align 4, !tbaa !5
  %59 = load i32, ptr @tot, align 4, !tbaa !5
  %60 = add nsw i32 %59, 1
  store i32 %60, ptr @tot, align 4, !tbaa !5
  %61 = sext i32 %60 to i64
  %62 = getelementptr inbounds [4001 x i32], ptr @typ, i64 0, i64 %61
  store i32 %58, ptr %62, align 4, !tbaa !5
  %63 = load i32, ptr @tot, align 4, !tbaa !5
  %64 = sext i32 %63 to i64
  %65 = getelementptr inbounds [4001 x %"class.std::vector"], ptr @e, i64 0, i64 %64
  call void @_ZNSt6vectorIiSaIiEE4swapERS1_(ptr noundef nonnull align 8 dereferenceable(24) %65, ptr noundef nonnull align 8 dereferenceable(24) %4) #3
  %66 = load i32, ptr @tot, align 4, !tbaa !5
  store i32 %66, ptr %2, align 4
  store i32 1, ptr %9, align 4
  br label %67

67:                                               ; preds = %54, %51
  call void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %4) #3
  call void @llvm.lifetime.end.p0(i64 24, ptr %4) #3
  %68 = load i32, ptr %2, align 4
  ret i32 %68

69:                                               ; preds = %38
  %70 = load ptr, ptr %7, align 8
  %71 = load i32, ptr %8, align 4
  %72 = insertvalue { ptr, i32 } poison, ptr %70, 0
  %73 = insertvalue { ptr, i32 } %72, i32 %71, 1
  resume { ptr, i32 } %73
}

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

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEE9push_backEOi(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(4)) #1 align 2

declare i32 @__gxx_personality_v0(...)

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEE4backEv(ptr noundef nonnull align 8 dereferenceable(24)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEE4swapERS1_(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 8 dereferenceable(24)) #0 align 2

attributes #0 = { 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 #1 = { 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 #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = distinct !{!9, !10}
!10 = !{!"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"

%"class.std::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" = type { ptr, ptr, ptr }

@tot = external dso_local local_unnamed_addr global i32, align 4
@val = external dso_local local_unnamed_addr global [20001 x i32], align 16
@son = external dso_local local_unnamed_addr global [20001 x [27 x i32]], align 16
@typ = external dso_local local_unnamed_addr global [4001 x i32], align 16
@e = external dso_local global [4001 x %"class.std::vector"], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z3dfsi(i32 noundef %0) local_unnamed_addr #1 personality ptr @__gxx_personality_v0 {
  %2 = alloca %"class.std::vector", align 8
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %2) #3
  call void @_ZNSt6vectorIiSaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(24) %2) #3
  %4 = sext i32 %0 to i64
  br label %8

5:                                                ; preds = %15
  %6 = getelementptr inbounds [20001 x i32], ptr @val, i64 0, i64 %4
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %.not = icmp eq i32 %7, 0
  br i1 %.not, label %18, label %23

8:                                                ; preds = %1, %15
  %indvars.iv = phi i64 [ 0, %1 ], [ %indvars.iv.next, %15 ]
  %9 = getelementptr inbounds [20001 x [27 x i32]], ptr @son, i64 0, i64 %4, i64 %indvars.iv
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %.not11 = icmp eq i32 %10, 0
  br i1 %.not11, label %15, label %11

11:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #3
  %12 = invoke noundef i32 @_Z3dfsi(i32 noundef %10)
          to label %13 unwind label %16

13:                                               ; preds = %11
  store i32 %12, ptr %3, align 4, !tbaa !5
  invoke void @_ZNSt6vectorIiSaIiEE9push_backEOi(ptr noundef nonnull align 8 dereferenceable(24) %2, ptr noundef nonnull align 4 dereferenceable(4) %3)
          to label %14 unwind label %16

14:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #3
  br label %15

15:                                               ; preds = %8, %14
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, 26
  br i1 %exitcond.not, label %5, label %8, !llvm.loop !9

16:                                               ; preds = %13, %11
  %17 = landingpad { ptr, i32 }
          cleanup
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #3
  call void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %2) #3
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %2) #3
  resume { ptr, i32 } %17

18:                                               ; preds = %5
  %19 = call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %2) #3
  %20 = icmp eq i64 %19, 1
  br i1 %20, label %21, label %._crit_edge

._crit_edge:                                      ; preds = %18
  %.pre = load i32, ptr %6, align 4, !tbaa !5
  br label %23

21:                                               ; preds = %18
  %22 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEE4backEv(ptr noundef nonnull align 8 dereferenceable(24) %2) #3
  br label %30

23:                                               ; preds = %._crit_edge, %5
  %24 = phi i32 [ %.pre, %._crit_edge ], [ %7, %5 ]
  %25 = load i32, ptr @tot, align 4, !tbaa !5
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr @tot, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [4001 x i32], ptr @typ, i64 0, i64 %27
  store i32 %24, ptr %28, align 4, !tbaa !5
  %29 = getelementptr inbounds [4001 x %"class.std::vector"], ptr @e, i64 0, i64 %27
  call void @_ZNSt6vectorIiSaIiEE4swapERS1_(ptr noundef nonnull align 8 dereferenceable(24) %29, ptr noundef nonnull align 8 dereferenceable(24) %2) #3
  br label %30

30:                                               ; preds = %23, %21
  %.0.in = phi ptr [ @tot, %23 ], [ %22, %21 ]
  %.0 = load i32, ptr %.0.in, align 4, !tbaa !5
  call void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %2) #3
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %2) #3
  ret i32 %.0
}

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

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEE9push_backEOi(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #1 align 2

declare i32 @__gxx_personality_v0(...)

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEE4backEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEE4swapERS1_(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

attributes #0 = { 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 #1 = { 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 #2 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LICMPass,LoopRotatePass,SROAPass,SimplifyCFGPass