; LLVM IR from lzyrapx/Competitive-Programming :: HDUOJ (1035)

; 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.graph = type { i8, i32 }
%"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 }

@G = external dso_local global [15 x [15 x %struct.graph]], align 16
@vis = external dso_local global [15 x [15 x i32]], align 16
@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@k = external dso_local global i32, align 4
@_ZSt3cin = external global %"class.std::basic_istream", align 8

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3gaov() #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 norecurse uwtable
define dso_local noundef i32 @main() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %5 = call noundef zeroext i1 @_ZNSt8ios_base15sync_with_stdioEb(i1 noundef zeroext false)
  br label %6

6:                                                ; preds = %60, %0
  %7 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) @n)
  %8 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %7, ptr noundef nonnull align 4 dereferenceable(4) @m)
  %9 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %8, ptr noundef nonnull align 4 dereferenceable(4) @k)
  %10 = load ptr, ptr %9, align 8, !tbaa !5
  %11 = getelementptr i8, ptr %10, i64 -24
  %12 = load i64, ptr %11, align 8
  %13 = getelementptr inbounds i8, ptr %9, i64 %12
  %14 = call noundef zeroext i1 @_ZNKSt9basic_iosIcSt11char_traitsIcEEcvbEv(ptr noundef nonnull align 8 dereferenceable(264) %13)
  br i1 %14, label %15, label %61

15:                                               ; preds = %6
  %16 = load i32, ptr @n, align 4, !tbaa !8
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %25

18:                                               ; preds = %15
  %19 = load i32, ptr @m, align 4, !tbaa !8
  %20 = icmp eq i32 %19, 0
  br i1 %20, label %21, label %25

21:                                               ; preds = %18
  %22 = load i32, ptr @k, align 4, !tbaa !8
  %23 = icmp eq i32 %22, 0
  br i1 %23, label %24, label %25

24:                                               ; preds = %21
  br label %61

25:                                               ; preds = %21, %18, %15
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  store i32 1, ptr %2, align 4, !tbaa !8
  br label %26

26:                                               ; preds = %57, %25
  %27 = load i32, ptr %2, align 4, !tbaa !8
  %28 = load i32, ptr @n, align 4, !tbaa !8
  %29 = icmp sle i32 %27, %28
  br i1 %29, label %31, label %30

30:                                               ; preds = %26
  store i32 4, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  br label %60

31:                                               ; preds = %26
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  store i32 1, ptr %4, align 4, !tbaa !8
  br label %32

32:                                               ; preds = %53, %31
  %33 = load i32, ptr %4, align 4, !tbaa !8
  %34 = load i32, ptr @m, align 4, !tbaa !8
  %35 = icmp sle i32 %33, %34
  br i1 %35, label %37, label %36

36:                                               ; preds = %32
  store i32 7, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  br label %56

37:                                               ; preds = %32
  %38 = load i32, ptr %2, align 4, !tbaa !8
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds [15 x [15 x %struct.graph]], ptr @G, i64 0, i64 %39
  %41 = load i32, ptr %4, align 4, !tbaa !8
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds [15 x %struct.graph], ptr %40, i64 0, i64 %42
  %44 = getelementptr inbounds %struct.graph, ptr %43, i32 0, i32 0
  %45 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZStrsIcSt11char_traitsIcEERSt13basic_istreamIT_T0_ES6_RS3_(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 1 dereferenceable(1) %44)
  %46 = load i32, ptr %2, align 4, !tbaa !8
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds [15 x [15 x %struct.graph]], ptr @G, i64 0, i64 %47
  %49 = load i32, ptr %4, align 4, !tbaa !8
  %50 = sext i32 %49 to i64
  %51 = getelementptr inbounds [15 x %struct.graph], ptr %48, i64 0, i64 %50
  %52 = getelementptr inbounds %struct.graph, ptr %51, i32 0, i32 1
  store i32 0, ptr %52, align 4, !tbaa !11
  br label %53

53:                                               ; preds = %37
  %54 = load i32, ptr %4, align 4, !tbaa !8
  %55 = add nsw i32 %54, 1
  store i32 %55, ptr %4, align 4, !tbaa !8
  br label %32, !llvm.loop !13

56:                                               ; preds = %36
  br label %57

57:                                               ; preds = %56
  %58 = load i32, ptr %2, align 4, !tbaa !8
  %59 = add nsw i32 %58, 1
  store i32 %59, ptr %2, align 4, !tbaa !8
  br label %26, !llvm.loop !15

60:                                               ; preds = %30
  call void @llvm.memset.p0.i64(ptr align 16 @vis, i8 0, i64 900, i1 false)
  call void @_Z3gaov()
  br label %6, !llvm.loop !16

61:                                               ; preds = %24, %6
  ret i32 0
}

declare noundef zeroext i1 @_ZNSt8ios_base15sync_with_stdioEb(i1 noundef zeroext) #3

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) #3

; Function Attrs: mustprogress uwtable
declare noundef zeroext i1 @_ZNKSt9basic_iosIcSt11char_traitsIcEEcvbEv(ptr noundef nonnull align 8 dereferenceable(264)) #0 align 2

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZStrsIcSt11char_traitsIcEERSt13basic_istreamIT_T0_ES6_RS3_(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 1 dereferenceable(1)) #3

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #4

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 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 #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 = { nocallback nofree nounwind willreturn memory(argmem: write) }
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 = !{!12, !9, i64 4}
!12 = !{!"_ZTS5graph", !10, i64 0, !9, i64 4}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}
!16 = distinct !{!16, !14}


; 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"

%struct.graph = type { i8, i32 }
%"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 }

@G = external dso_local global [15 x [15 x %struct.graph]], align 16
@vis = external dso_local local_unnamed_addr global [15 x [15 x i32]], align 16
@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@k = external dso_local global i32, align 4
@_ZSt3cin = external global %"class.std::basic_istream", align 8

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3gaov() local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  %1 = tail call noundef zeroext i1 @_ZNSt8ios_base15sync_with_stdioEb(i1 noundef zeroext false)
  %2 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) @n)
  %3 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %2, ptr noundef nonnull align 4 dereferenceable(4) @m)
  %4 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %3, ptr noundef nonnull align 4 dereferenceable(4) @k)
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %6 = getelementptr i8, ptr %5, i64 -24
  %7 = load i64, ptr %6, align 8
  %8 = getelementptr inbounds i8, ptr %4, i64 %7
  %9 = tail call noundef zeroext i1 @_ZNKSt9basic_iosIcSt11char_traitsIcEEcvbEv(ptr noundef nonnull align 8 dereferenceable(264) %8)
  br i1 %9, label %.lr.ph20, label %._crit_edge21

.lr.ph20:                                         ; preds = %0, %._crit_edge18
  %10 = load i32, ptr @n, align 4, !tbaa !8
  %11 = icmp eq i32 %10, 0
  %12 = load i32, ptr @m, align 4
  %13 = icmp eq i32 %12, 0
  %or.cond = select i1 %11, i1 %13, i1 false
  %14 = load i32, ptr @k, align 4
  %15 = icmp eq i32 %14, 0
  %or.cond3 = select i1 %or.cond, i1 %15, i1 false
  br i1 %or.cond3, label %._crit_edge21, label %.preheader13

.preheader13:                                     ; preds = %.lr.ph20
  %.not16 = icmp slt i32 %10, 1
  %16 = icmp slt i32 %12, 1
  %or.cond28 = select i1 %.not16, i1 true, i1 %16
  br i1 %or.cond28, label %._crit_edge18, label %.preheader

.preheader:                                       ; preds = %.preheader13, %._crit_edge
  %17 = phi i32 [ %27, %._crit_edge ], [ %10, %.preheader13 ]
  %18 = phi i32 [ %28, %._crit_edge ], [ %12, %.preheader13 ]
  %indvars.iv25 = phi i64 [ %indvars.iv.next26, %._crit_edge ], [ 1, %.preheader13 ]
  %.not1214 = icmp slt i32 %18, 1
  br i1 %.not1214, label %._crit_edge, label %.lr.ph

._crit_edge18:                                    ; preds = %._crit_edge, %.preheader13
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(900) @vis, i8 0, i64 900, i1 false)
  tail call void @_Z3gaov()
  %19 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) @n)
  %20 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %19, ptr noundef nonnull align 4 dereferenceable(4) @m)
  %21 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %20, ptr noundef nonnull align 4 dereferenceable(4) @k)
  %22 = load ptr, ptr %21, align 8, !tbaa !5
  %23 = getelementptr i8, ptr %22, i64 -24
  %24 = load i64, ptr %23, align 8
  %25 = getelementptr inbounds i8, ptr %21, i64 %24
  %26 = tail call noundef zeroext i1 @_ZNKSt9basic_iosIcSt11char_traitsIcEEcvbEv(ptr noundef nonnull align 8 dereferenceable(264) %25)
  br i1 %26, label %.lr.ph20, label %._crit_edge21, !llvm.loop !11

._crit_edge.loopexit:                             ; preds = %.lr.ph
  %.pre = load i32, ptr @n, align 4, !tbaa !8
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.preheader
  %27 = phi i32 [ %.pre, %._crit_edge.loopexit ], [ %17, %.preheader ]
  %28 = phi i32 [ %33, %._crit_edge.loopexit ], [ %18, %.preheader ]
  %indvars.iv.next26 = add nuw nsw i64 %indvars.iv25, 1
  %29 = sext i32 %27 to i64
  %.not.not = icmp slt i64 %indvars.iv25, %29
  br i1 %.not.not, label %.preheader, label %._crit_edge18, !llvm.loop !13

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 1, %.preheader ]
  %30 = getelementptr inbounds [15 x [15 x %struct.graph]], ptr @G, i64 0, i64 %indvars.iv25, i64 %indvars.iv
  %31 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZStrsIcSt11char_traitsIcEERSt13basic_istreamIT_T0_ES6_RS3_(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 1 dereferenceable(1) %30)
  %32 = getelementptr inbounds i8, ptr %30, i64 4
  store i32 0, ptr %32, align 4, !tbaa !15
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %33 = load i32, ptr @m, align 4, !tbaa !8
  %34 = sext i32 %33 to i64
  %.not12.not = icmp slt i64 %indvars.iv, %34
  br i1 %.not12.not, label %.lr.ph, label %._crit_edge.loopexit, !llvm.loop !17

._crit_edge21:                                    ; preds = %._crit_edge18, %.lr.ph20, %0
  ret i32 0
}

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

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 uwtable
declare noundef zeroext i1 @_ZNKSt9basic_iosIcSt11char_traitsIcEEcvbEv(ptr noundef nonnull align 8 dereferenceable(264)) local_unnamed_addr #0 align 2

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZStrsIcSt11char_traitsIcEERSt13basic_istreamIT_T0_ES6_RS3_(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 1 dereferenceable(1)) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #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 = { "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 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 = !{!"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, !14}
!14 = !{!"llvm.loop.unswitch.partial.disable"}
!15 = !{!16, !9, i64 4}
!16 = !{!"_ZTS5graph", !10, i64 0, !9, i64 4}
!17 = distinct !{!17, !12}


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