; LLVM IR from tangjz/acm-icpc :: 51nod (1287)

; 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"

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@seg = external dso_local global [100003 x i32], align 16
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [5 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z8seg_initii(i32 noundef, 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: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7seg_idxii(i32 noundef, i32 noundef) #2

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

; 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 @_Z7seg_updiii(i32 noundef, i32 noundef, i32 noundef) #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z7seg_queii(i32 noundef, i32 noundef) #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #4 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.2, ptr noundef @n, ptr noundef @m)
  %5 = load i32, ptr @n, align 4, !tbaa !5
  call void @_Z8seg_initii(i32 noundef 1, i32 noundef %5)
  br label %6

6:                                                ; preds = %32, %30, %0
  %7 = load i32, ptr @m, align 4, !tbaa !5
  %8 = add nsw i32 %7, -1
  store i32 %8, ptr @m, align 4, !tbaa !5
  %9 = icmp ne i32 %7, 0
  br i1 %9, label %10, label %33

10:                                               ; preds = %6
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  %11 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2)
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = call noundef i32 @_Z7seg_idxii(i32 noundef 1, i32 noundef 1)
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [100003 x i32], ptr @seg, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = icmp sle i32 %12, %16
  br i1 %17, label %26, label %18

18:                                               ; preds = %10
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = load i32, ptr @n, align 4, !tbaa !5
  %21 = call noundef i32 @_Z7seg_idxii(i32 noundef 1, i32 noundef %20)
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [100003 x i32], ptr @seg, i64 0, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = icmp sgt i32 %19, %24
  br i1 %25, label %26, label %27

26:                                               ; preds = %18, %10
  store i32 2, ptr %3, align 4
  br label %30, !llvm.loop !9

27:                                               ; preds = %18
  %28 = load i32, ptr @n, align 4, !tbaa !5
  %29 = load i32, ptr %2, align 4, !tbaa !5
  call void @_Z7seg_updiii(i32 noundef 1, i32 noundef %28, i32 noundef %29)
  store i32 0, ptr %3, align 4
  br label %30

30:                                               ; preds = %27, %26
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  %31 = load i32, ptr %3, align 4
  switch i32 %31, label %35 [
    i32 0, label %32
    i32 2, label %6
  ]

32:                                               ; preds = %30
  br label %6, !llvm.loop !9

33:                                               ; preds = %6
  %34 = load i32, ptr @n, align 4, !tbaa !5
  call void @_Z7seg_queii(i32 noundef 1, i32 noundef %34)
  ret i32 0

35:                                               ; preds = %30
  unreachable
}

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 = { inlinehint 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 = { "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 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 #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"}


; 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"

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@seg = external dso_local local_unnamed_addr global [100003 x i32], align 16
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [5 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z8seg_initii(i32 noundef, 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: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7seg_idxii(i32 noundef, i32 noundef) local_unnamed_addr #2

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

; 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 uwtable
declare dso_local void @_Z7seg_updiii(i32 noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z7seg_queii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #4 {
  %1 = alloca i32, align 4
  %2 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.2, ptr noundef nonnull @n, ptr noundef nonnull @m)
  %3 = load i32, ptr @n, align 4, !tbaa !5
  tail call void @_Z8seg_initii(i32 noundef 1, i32 noundef %3)
  %4 = load i32, ptr @m, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr @m, align 4, !tbaa !5
  %.not2 = icmp eq i32 %4, 0
  br i1 %.not2, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %23
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1)
  %7 = load i32, ptr %1, align 4, !tbaa !5
  %8 = call noundef i32 @_Z7seg_idxii(i32 noundef 1, i32 noundef 1)
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds [100003 x i32], ptr @seg, i64 0, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %.not1 = icmp sgt i32 %7, %11
  br i1 %.not1, label %12, label %23, !llvm.loop !9

12:                                               ; preds = %.lr.ph
  %13 = load i32, ptr %1, align 4, !tbaa !5
  %14 = load i32, ptr @n, align 4, !tbaa !5
  %15 = call noundef i32 @_Z7seg_idxii(i32 noundef 1, i32 noundef %14)
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [100003 x i32], ptr @seg, i64 0, i64 %16
  %18 = load i32, ptr %17, align 4, !tbaa !5
  %19 = icmp sgt i32 %13, %18
  br i1 %19, label %23, label %20, !llvm.loop !9

20:                                               ; preds = %12
  %21 = load i32, ptr @n, align 4, !tbaa !5
  %22 = load i32, ptr %1, align 4, !tbaa !5
  call void @_Z7seg_updiii(i32 noundef 1, i32 noundef %21, i32 noundef %22)
  br label %23

23:                                               ; preds = %.lr.ph, %12, %20
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #5
  %24 = load i32, ptr @m, align 4, !tbaa !5
  %25 = add nsw i32 %24, -1
  store i32 %25, ptr @m, align 4, !tbaa !5
  %.not = icmp eq i32 %24, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %23, %0
  %26 = load i32, ptr @n, align 4, !tbaa !5
  call void @_Z7seg_queii(i32 noundef 1, i32 noundef %26)
  ret i32 0
}

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 = { inlinehint 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 = { 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 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 #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"}


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