; LLVM IR from Tunghohin/Competitive_Coding :: Codeforces (cf1567_B)

; 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::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }

@xor_prefix = external dso_local global [300010 x i32], align 16
@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5solvev() #0

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

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) #2

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

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #3 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %4 = call noundef zeroext i1 @_ZNSt8ios_base15sync_with_stdioEb(i1 noundef zeroext false)
  %5 = load ptr, ptr @_ZSt3cin, align 8, !tbaa !5
  %6 = getelementptr i8, ptr %5, i64 -24
  %7 = load i64, ptr %6, align 8
  %8 = getelementptr inbounds i8, ptr @_ZSt3cin, i64 %7
  %9 = call noundef ptr @_ZNSt9basic_iosIcSt11char_traitsIcEE3tieEPSo(ptr noundef nonnull align 8 dereferenceable(264) %8, ptr noundef null)
  %10 = load ptr, ptr @_ZSt4cout, align 8, !tbaa !5
  %11 = getelementptr i8, ptr %10, i64 -24
  %12 = load i64, ptr %11, align 8
  %13 = getelementptr inbounds i8, ptr @_ZSt4cout, i64 %12
  %14 = call noundef ptr @_ZNSt9basic_iosIcSt11char_traitsIcEE3tieEPSo(ptr noundef nonnull align 8 dereferenceable(264) %13, ptr noundef null)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  %15 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %2)
  store i32 0, ptr @xor_prefix, align 16, !tbaa !8
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  store i32 1, ptr %3, align 4, !tbaa !8
  br label %16

16:                                               ; preds = %31, %0
  %17 = load i32, ptr %3, align 4, !tbaa !8
  %18 = icmp sle i32 %17, 300000
  br i1 %18, label %20, label %19

19:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  br label %34

20:                                               ; preds = %16
  %21 = load i32, ptr %3, align 4, !tbaa !8
  %22 = load i32, ptr %3, align 4, !tbaa !8
  %23 = sub nsw i32 %22, 1
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [300010 x i32], ptr @xor_prefix, i64 0, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !8
  %27 = xor i32 %21, %26
  %28 = load i32, ptr %3, align 4, !tbaa !8
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [300010 x i32], ptr @xor_prefix, i64 0, i64 %29
  store i32 %27, ptr %30, align 4, !tbaa !8
  br label %31

31:                                               ; preds = %20
  %32 = load i32, ptr %3, align 4, !tbaa !8
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %3, align 4, !tbaa !8
  br label %16, !llvm.loop !11

34:                                               ; preds = %19
  br label %35

35:                                               ; preds = %39, %34
  %36 = load i32, ptr %2, align 4, !tbaa !8
  %37 = add nsw i32 %36, -1
  store i32 %37, ptr %2, align 4, !tbaa !8
  %38 = icmp ne i32 %36, 0
  br i1 %38, label %39, label %40

39:                                               ; preds = %35
  call void @_Z5solvev()
  br label %35, !llvm.loop !13

40:                                               ; preds = %35
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  %41 = load i32, ptr %1, align 4
  ret i32 %41
}

declare noundef zeroext i1 @_ZNSt8ios_base15sync_with_stdioEb(i1 noundef zeroext) #2

; Function Attrs: mustprogress nounwind uwtable
declare noundef ptr @_ZNSt9basic_iosIcSt11char_traitsIcEE3tieEPSo(ptr noundef nonnull align 8 dereferenceable(264), ptr noundef) #4 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 = { "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 = { 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 #4 = { 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 #5 = { 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 = !{!"vtable pointer", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !10, i64 0}
!10 = !{!"omnipotent char", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !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::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }

@xor_prefix = external dso_local local_unnamed_addr global [300010 x i32], align 16
@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5solvev() local_unnamed_addr #0

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

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

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

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #3 {
  %1 = alloca i32, align 4
  %2 = tail call noundef zeroext i1 @_ZNSt8ios_base15sync_with_stdioEb(i1 noundef zeroext false)
  %3 = load ptr, ptr @_ZSt3cin, align 8, !tbaa !5
  %4 = getelementptr i8, ptr %3, i64 -24
  %5 = load i64, ptr %4, align 8
  %6 = getelementptr inbounds i8, ptr @_ZSt3cin, i64 %5
  %7 = tail call noundef ptr @_ZNSt9basic_iosIcSt11char_traitsIcEE3tieEPSo(ptr noundef nonnull align 8 dereferenceable(264) %6, ptr noundef null)
  %8 = load ptr, ptr @_ZSt4cout, align 8, !tbaa !5
  %9 = getelementptr i8, ptr %8, i64 -24
  %10 = load i64, ptr %9, align 8
  %11 = getelementptr inbounds i8, ptr @_ZSt4cout, i64 %10
  %12 = tail call noundef ptr @_ZNSt9basic_iosIcSt11char_traitsIcEE3tieEPSo(ptr noundef nonnull align 8 dereferenceable(264) %11, ptr noundef null)
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  %13 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %1)
  store i32 0, ptr @xor_prefix, align 16, !tbaa !8
  br label %16

.preheader:                                       ; preds = %16
  %14 = load i32, ptr %1, align 4, !tbaa !8
  %15 = add nsw i32 %14, -1
  store i32 %15, ptr %1, align 4, !tbaa !8
  %.not7 = icmp eq i32 %14, 0
  br i1 %.not7, label %._crit_edge, label %.lr.ph

16:                                               ; preds = %16, %0
  %17 = phi i32 [ 0, %0 ], [ %34, %16 ]
  %indvars.iv = phi i64 [ 1, %0 ], [ %indvars.iv.next.5, %16 ]
  %18 = trunc nuw nsw i64 %indvars.iv to i32
  %19 = xor i32 %17, %18
  %20 = getelementptr inbounds [300010 x i32], ptr @xor_prefix, i64 0, i64 %indvars.iv
  store i32 %19, ptr %20, align 4, !tbaa !8
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %21 = trunc nuw nsw i64 %indvars.iv.next to i32
  %22 = xor i32 %19, %21
  %23 = getelementptr inbounds [300010 x i32], ptr @xor_prefix, i64 0, i64 %indvars.iv.next
  store i32 %22, ptr %23, align 4, !tbaa !8
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %24 = trunc nuw nsw i64 %indvars.iv.next.1 to i32
  %25 = xor i32 %22, %24
  %26 = getelementptr inbounds [300010 x i32], ptr @xor_prefix, i64 0, i64 %indvars.iv.next.1
  store i32 %25, ptr %26, align 4, !tbaa !8
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %27 = trunc nuw nsw i64 %indvars.iv.next.2 to i32
  %28 = xor i32 %25, %27
  %29 = getelementptr inbounds [300010 x i32], ptr @xor_prefix, i64 0, i64 %indvars.iv.next.2
  store i32 %28, ptr %29, align 4, !tbaa !8
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %30 = trunc nuw nsw i64 %indvars.iv.next.3 to i32
  %31 = xor i32 %28, %30
  %32 = getelementptr inbounds [300010 x i32], ptr @xor_prefix, i64 0, i64 %indvars.iv.next.3
  store i32 %31, ptr %32, align 4, !tbaa !8
  %indvars.iv.next.4 = add nuw nsw i64 %indvars.iv, 5
  %33 = trunc nuw nsw i64 %indvars.iv.next.4 to i32
  %34 = xor i32 %31, %33
  %35 = getelementptr inbounds [300010 x i32], ptr @xor_prefix, i64 0, i64 %indvars.iv.next.4
  store i32 %34, ptr %35, align 4, !tbaa !8
  %indvars.iv.next.5 = add nuw nsw i64 %indvars.iv, 6
  %exitcond.not.5 = icmp eq i64 %indvars.iv.next.5, 300001
  br i1 %exitcond.not.5, label %.preheader, label %16, !llvm.loop !11

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  call void @_Z5solvev()
  %36 = load i32, ptr %1, align 4, !tbaa !8
  %37 = add nsw i32 %36, -1
  store i32 %37, ptr %1, align 4, !tbaa !8
  %.not = icmp eq i32 %36, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #5
  ret i32 0
}

declare noundef zeroext i1 @_ZNSt8ios_base15sync_with_stdioEb(i1 noundef zeroext) local_unnamed_addr #2

; Function Attrs: mustprogress nounwind uwtable
declare noundef ptr @_ZNSt9basic_iosIcSt11char_traitsIcEE3tieEPSo(ptr noundef nonnull align 8 dereferenceable(264), ptr noundef) local_unnamed_addr #4 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 = { 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 #4 = { 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 #5 = { 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 = !{!"vtable pointer", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !10, i64 0}
!10 = !{!"omnipotent char", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; Effective O3 passes: BDCEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass