; LLVM IR from tangjz/acm-icpc :: lydsy (2582)

; 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 }

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@nn = external dso_local global i32, align 4
@mm = external dso_local global i32, align 4
@ans = external dso_local global i32, align 4
@edge = external dso_local global [100001 x %"class.std::vector"], align 16
@vis = external dso_local global [100001 x i8], align 16
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1

; 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 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
  %5 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n, ptr noundef @m)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  store i32 0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  br label %7

7:                                                ; preds = %20, %0
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = load i32, ptr @m, align 4, !tbaa !5
  %10 = icmp slt i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  br label %23

12:                                               ; preds = %7
  %13 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %3, ptr noundef %4)
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [100001 x %"class.std::vector"], ptr @edge, i64 0, i64 %15
  call void @_ZNSt6vectorIiSaIiEE9push_backERKi(ptr noundef nonnull align 8 dereferenceable(24) %16, ptr noundef nonnull align 4 dereferenceable(4) %4)
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [100001 x %"class.std::vector"], ptr @edge, i64 0, i64 %18
  call void @_ZNSt6vectorIiSaIiEE9push_backERKi(ptr noundef nonnull align 8 dereferenceable(24) %19, ptr noundef nonnull align 4 dereferenceable(4) %3)
  br label %20

20:                                               ; preds = %12
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %2, align 4, !tbaa !5
  br label %7, !llvm.loop !9

23:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #5
  store i32 1, ptr %5, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %68, %23
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = load i32, ptr @n, align 4, !tbaa !5
  %27 = icmp sle i32 %25, %26
  br i1 %27, label %29, label %28

28:                                               ; preds = %24
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #5
  br label %71

29:                                               ; preds = %24
  %30 = load i32, ptr %5, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds [100001 x i8], ptr @vis, i64 0, i64 %31
  %33 = load i8, ptr %32, align 1, !tbaa !11, !range !13, !noundef !14
  %34 = trunc i8 %33 to i1
  br i1 %34, label %40, label %35

35:                                               ; preds = %29
  %36 = load i32, ptr %5, align 4, !tbaa !5
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds [100001 x %"class.std::vector"], ptr @edge, i64 0, i64 %37
  %39 = call noundef zeroext i1 @_ZNKSt6vectorIiSaIiEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(24) %38) #5
  br i1 %39, label %40, label %41

40:                                               ; preds = %35, %29
  br label %68

41:                                               ; preds = %35
  store i32 0, ptr @mm, align 4, !tbaa !5
  store i32 0, ptr @nn, align 4, !tbaa !5
  %42 = load i32, ptr %5, align 4, !tbaa !5
  call void @_Z3dfsi(i32 noundef %42)
  %43 = load i32, ptr @mm, align 4, !tbaa !5
  %44 = ashr i32 %43, 1
  store i32 %44, ptr @mm, align 4, !tbaa !5
  %45 = load i32, ptr @nn, align 4, !tbaa !5
  %46 = load i32, ptr @mm, align 4, !tbaa !5
  %47 = add nsw i32 %46, 1
  %48 = icmp eq i32 %45, %47
  br i1 %48, label %49, label %57

49:                                               ; preds = %41
  %50 = load i32, ptr @ans, align 4, !tbaa !5
  %51 = sext i32 %50 to i64
  %52 = load i32, ptr @nn, align 4, !tbaa !5
  %53 = sext i32 %52 to i64
  %54 = mul nsw i64 %51, %53
  %55 = srem i64 %54, 1000000007
  %56 = trunc i64 %55 to i32
  store i32 %56, ptr @ans, align 4, !tbaa !5
  br label %67

57:                                               ; preds = %41
  %58 = load i32, ptr @nn, align 4, !tbaa !5
  %59 = load i32, ptr @mm, align 4, !tbaa !5
  %60 = icmp eq i32 %58, %59
  br i1 %60, label %61, label %65

61:                                               ; preds = %57
  %62 = load i32, ptr @ans, align 4, !tbaa !5
  %63 = shl i32 %62, 1
  %64 = srem i32 %63, 1000000007
  store i32 %64, ptr @ans, align 4, !tbaa !5
  br label %66

65:                                               ; preds = %57
  store i32 0, ptr @ans, align 4, !tbaa !5
  br label %66

66:                                               ; preds = %65, %61
  br label %67

67:                                               ; preds = %66, %49
  br label %68

68:                                               ; preds = %67, %40
  %69 = load i32, ptr %5, align 4, !tbaa !5
  %70 = add nsw i32 %69, 1
  store i32 %70, ptr %5, align 4, !tbaa !5
  br label %24, !llvm.loop !15

71:                                               ; preds = %28
  %72 = load i32, ptr @ans, align 4, !tbaa !5
  %73 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %72)
  ret i32 0
}

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

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEE9push_backERKi(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(4)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt6vectorIiSaIiEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(24)) #4 align 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 = { 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 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !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"

%"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 }

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@nn = external dso_local local_unnamed_addr global i32, align 4
@mm = external dso_local local_unnamed_addr global i32, align 4
@ans = external dso_local local_unnamed_addr global i32, align 4
@edge = external dso_local global [100001 x %"class.std::vector"], align 16
@vis = external dso_local local_unnamed_addr global [100001 x i8], align 16
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1

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

; 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 #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n, ptr noundef nonnull @m)
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #5
  %4 = load i32, ptr @m, align 4, !tbaa !5
  %5 = icmp sgt i32 %4, 0
  br i1 %5, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %0
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #5
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %.not10 = icmp slt i32 %6, 1
  br i1 %.not10, label %._crit_edge14, label %.lr.ph13

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.079 = phi i32 [ %14, %.lr.ph ], [ 0, %0 ]
  %7 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1, ptr noundef nonnull %2)
  %8 = load i32, ptr %1, align 4, !tbaa !5
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds [100001 x %"class.std::vector"], ptr @edge, i64 0, i64 %9
  call void @_ZNSt6vectorIiSaIiEE9push_backERKi(ptr noundef nonnull align 8 dereferenceable(24) %10, ptr noundef nonnull align 4 dereferenceable(4) %2)
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [100001 x %"class.std::vector"], ptr @edge, i64 0, i64 %12
  call void @_ZNSt6vectorIiSaIiEE9push_backERKi(ptr noundef nonnull align 8 dereferenceable(24) %13, ptr noundef nonnull align 4 dereferenceable(4) %1)
  %14 = add nuw nsw i32 %.079, 1
  %15 = load i32, ptr @m, align 4, !tbaa !5
  %16 = icmp slt i32 %14, %15
  br i1 %16, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge14:                                    ; preds = %45, %._crit_edge
  %17 = load i32, ptr @ans, align 4, !tbaa !5
  %18 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %17)
  ret i32 0

.lr.ph13:                                         ; preds = %._crit_edge, %45
  %indvars.iv = phi i64 [ %indvars.iv.next, %45 ], [ 1, %._crit_edge ]
  %19 = getelementptr inbounds [100001 x i8], ptr @vis, i64 0, i64 %indvars.iv
  %20 = load i8, ptr %19, align 1, !tbaa !11, !range !13, !noundef !14
  %21 = trunc nuw i8 %20 to i1
  br i1 %21, label %45, label %22

22:                                               ; preds = %.lr.ph13
  %23 = getelementptr inbounds [100001 x %"class.std::vector"], ptr @edge, i64 0, i64 %indvars.iv
  %24 = call noundef zeroext i1 @_ZNKSt6vectorIiSaIiEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(24) %23) #5
  br i1 %24, label %45, label %25

25:                                               ; preds = %22
  store i32 0, ptr @mm, align 4, !tbaa !5
  store i32 0, ptr @nn, align 4, !tbaa !5
  %26 = trunc nuw nsw i64 %indvars.iv to i32
  call void @_Z3dfsi(i32 noundef %26)
  %27 = load i32, ptr @mm, align 4, !tbaa !5
  %28 = ashr i32 %27, 1
  store i32 %28, ptr @mm, align 4, !tbaa !5
  %29 = load i32, ptr @nn, align 4, !tbaa !5
  %30 = add nsw i32 %28, 1
  %31 = icmp eq i32 %29, %30
  br i1 %31, label %32, label %39

32:                                               ; preds = %25
  %33 = load i32, ptr @ans, align 4, !tbaa !5
  %34 = sext i32 %33 to i64
  %35 = sext i32 %29 to i64
  %36 = mul nsw i64 %34, %35
  %37 = srem i64 %36, 1000000007
  %38 = trunc nsw i64 %37 to i32
  br label %.sink.split

39:                                               ; preds = %25
  %40 = icmp eq i32 %29, %28
  br i1 %40, label %41, label %.sink.split

41:                                               ; preds = %39
  %42 = load i32, ptr @ans, align 4, !tbaa !5
  %43 = shl i32 %42, 1
  %44 = srem i32 %43, 1000000007
  br label %.sink.split

.sink.split:                                      ; preds = %39, %41, %32
  %.sink = phi i32 [ %38, %32 ], [ %44, %41 ], [ 0, %39 ]
  store i32 %.sink, ptr @ans, align 4, !tbaa !5
  br label %45

45:                                               ; preds = %.sink.split, %.lr.ph13, %22
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %46 = load i32, ptr @n, align 4, !tbaa !5
  %47 = sext i32 %46 to i64
  %.not.not = icmp slt i64 %indvars.iv, %47
  br i1 %.not.not, label %.lr.ph13, label %._crit_edge14, !llvm.loop !15
}

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

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEE9push_backERKi(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt6vectorIiSaIiEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #4 align 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 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 = { 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 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !10}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass