; LLVM IR from tangjz/acm-icpc :: zoj (3958)

; 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"

@t = external dso_local global i32, align 4
@n = external dso_local global i32, align 4
@x = external dso_local global i32, align 4
@a = external dso_local global i32, align 4
@b = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [10 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [6 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [5 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %2 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @t)
  br label %3

3:                                                ; preds = %44, %0
  %4 = load i32, ptr @t, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr @t, align 4, !tbaa !5
  %6 = icmp ne i32 %4, 0
  br i1 %6, label %7, label %47

7:                                                ; preds = %3
  store i32 0, ptr @b, align 4, !tbaa !5
  store i32 0, ptr @a, align 4, !tbaa !5
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  br label %9

9:                                                ; preds = %32, %7
  %10 = load i32, ptr @n, align 4, !tbaa !5
  %11 = add nsw i32 %10, -1
  store i32 %11, ptr @n, align 4, !tbaa !5
  %12 = icmp ne i32 %10, 0
  br i1 %12, label %13, label %33

13:                                               ; preds = %9
  %14 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @x)
  %15 = load i32, ptr @x, align 4, !tbaa !5
  switch i32 %15, label %32 [
    i32 1, label %16
    i32 2, label %19
    i32 3, label %22
    i32 4, label %27
  ]

16:                                               ; preds = %13
  %17 = load i32, ptr @a, align 4, !tbaa !5
  %18 = add nsw i32 %17, 1
  store i32 %18, ptr @a, align 4, !tbaa !5
  br label %32

19:                                               ; preds = %13
  %20 = load i32, ptr @b, align 4, !tbaa !5
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr @b, align 4, !tbaa !5
  br label %32

22:                                               ; preds = %13
  %23 = load i32, ptr @a, align 4, !tbaa !5
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr @a, align 4, !tbaa !5
  %25 = load i32, ptr @b, align 4, !tbaa !5
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr @b, align 4, !tbaa !5
  br label %32

27:                                               ; preds = %13
  %28 = load i32, ptr @a, align 4, !tbaa !5
  %29 = add nsw i32 %28, -1
  store i32 %29, ptr @a, align 4, !tbaa !5
  %30 = load i32, ptr @b, align 4, !tbaa !5
  %31 = add nsw i32 %30, -1
  store i32 %31, ptr @b, align 4, !tbaa !5
  br label %32

32:                                               ; preds = %27, %22, %19, %16, %13
  br label %9, !llvm.loop !9

33:                                               ; preds = %9
  %34 = load i32, ptr @a, align 4, !tbaa !5
  %35 = load i32, ptr @b, align 4, !tbaa !5
  %36 = icmp sgt i32 %34, %35
  br i1 %36, label %37, label %38

37:                                               ; preds = %33
  br label %44

38:                                               ; preds = %33
  %39 = load i32, ptr @a, align 4, !tbaa !5
  %40 = load i32, ptr @b, align 4, !tbaa !5
  %41 = icmp slt i32 %39, %40
  %42 = zext i1 %41 to i64
  %43 = select i1 %41, ptr @.str.2, ptr @.str.3
  br label %44

44:                                               ; preds = %38, %37
  %45 = phi ptr [ @.str.1, %37 ], [ %43, %38 ]
  %46 = call i32 @puts(ptr noundef %45)
  br label %3, !llvm.loop !11

47:                                               ; preds = %3
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

declare i32 @puts(ptr noundef) #1

attributes #0 = { 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 #1 = { "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" }

!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 = distinct !{!11, !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"

@t = external dso_local global i32, align 4
@n = external dso_local global i32, align 4
@x = external dso_local global i32, align 4
@a = external dso_local local_unnamed_addr global i32, align 4
@b = external dso_local local_unnamed_addr global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [10 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [6 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [5 x i8], align 1

; Function Attrs: mustprogress nofree norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @t)
  %2 = load i32, ptr @t, align 4, !tbaa !5
  %3 = add nsw i32 %2, -1
  store i32 %3, ptr @t, align 4, !tbaa !5
  %.not4 = icmp eq i32 %2, 0
  br i1 %.not4, label %._crit_edge7, label %.lr.ph6

.lr.ph6:                                          ; preds = %0, %._crit_edge
  store i32 0, ptr @b, align 4, !tbaa !5
  store i32 0, ptr @a, align 4, !tbaa !5
  %4 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %5 = load i32, ptr @n, align 4, !tbaa !5
  %6 = add nsw i32 %5, -1
  store i32 %6, ptr @n, align 4, !tbaa !5
  %.not23 = icmp eq i32 %5, 0
  br i1 %.not23, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph6, %18
  %7 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @x)
  %8 = load i32, ptr @x, align 4, !tbaa !5
  switch i32 %8, label %18 [
    i32 1, label %.sink.split
    i32 2, label %9
    i32 3, label %10
    i32 4, label %13
  ]

9:                                                ; preds = %.lr.ph
  br label %.sink.split

10:                                               ; preds = %.lr.ph
  %11 = load i32, ptr @a, align 4, !tbaa !5
  %12 = add nsw i32 %11, 1
  store i32 %12, ptr @a, align 4, !tbaa !5
  br label %.sink.split

13:                                               ; preds = %.lr.ph
  %14 = load i32, ptr @a, align 4, !tbaa !5
  %15 = add nsw i32 %14, -1
  store i32 %15, ptr @a, align 4, !tbaa !5
  br label %.sink.split

.sink.split:                                      ; preds = %.lr.ph, %9, %10, %13
  %b.sink10 = phi ptr [ @b, %13 ], [ @b, %10 ], [ @b, %9 ], [ @a, %.lr.ph ]
  %.sink9 = phi i32 [ -1, %13 ], [ 1, %10 ], [ 1, %9 ], [ %8, %.lr.ph ]
  %16 = load i32, ptr %b.sink10, align 4, !tbaa !5
  %17 = add nsw i32 %16, %.sink9
  store i32 %17, ptr %b.sink10, align 4, !tbaa !5
  br label %18

18:                                               ; preds = %.sink.split, %.lr.ph
  %19 = load i32, ptr @n, align 4, !tbaa !5
  %20 = add nsw i32 %19, -1
  store i32 %20, ptr @n, align 4, !tbaa !5
  %.not2 = icmp eq i32 %19, 0
  br i1 %.not2, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %18, %.lr.ph6
  %21 = load i32, ptr @a, align 4, !tbaa !5
  %22 = load i32, ptr @b, align 4, !tbaa !5
  %23 = icmp sgt i32 %21, %22
  %24 = icmp slt i32 %21, %22
  %25 = select i1 %24, ptr @.str.2, ptr @.str.3
  %26 = select i1 %23, ptr @.str.1, ptr %25
  %27 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) %26)
  %28 = load i32, ptr @t, align 4, !tbaa !5
  %29 = add nsw i32 %28, -1
  store i32 %29, ptr @t, align 4, !tbaa !5
  %.not = icmp eq i32 %28, 0
  br i1 %.not, label %._crit_edge7, label %.lr.ph6, !llvm.loop !11

._crit_edge7:                                     ; preds = %._crit_edge, %0
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #1

attributes #0 = { mustprogress nofree norecurse 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 = { 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" }

!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 = distinct !{!11, !10}


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