; LLVM IR from tangjz/acm-icpc :: codeforces/complete (719A)

; 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
@pre = external dso_local global i32, align 4
@cur = 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 [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 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 @n)
  br label %3

3:                                                ; preds = %7, %0
  %4 = load i32, ptr @n, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr @n, align 4, !tbaa !5
  %6 = icmp ne i32 %4, 0
  br i1 %6, label %7, label %10

7:                                                ; preds = %3
  %8 = load i32, ptr @cur, align 4, !tbaa !5
  store i32 %8, ptr @pre, align 4, !tbaa !5
  %9 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @cur)
  br label %3, !llvm.loop !9

10:                                               ; preds = %3
  %11 = load i32, ptr @pre, align 4, !tbaa !5
  %12 = icmp eq i32 %11, -1
  br i1 %12, label %13, label %27

13:                                               ; preds = %10
  %14 = load i32, ptr @cur, align 4, !tbaa !5
  %15 = icmp ne i32 %14, 15
  br i1 %15, label %16, label %20

16:                                               ; preds = %13
  %17 = load i32, ptr @cur, align 4, !tbaa !5
  %18 = icmp ne i32 %17, 0
  br i1 %18, label %19, label %20

19:                                               ; preds = %16
  br label %25

20:                                               ; preds = %16, %13
  %21 = load i32, ptr @cur, align 4, !tbaa !5
  %22 = icmp eq i32 %21, 0
  %23 = zext i1 %22 to i64
  %24 = select i1 %22, ptr @.str.2, ptr @.str.3
  br label %25

25:                                               ; preds = %20, %19
  %26 = phi ptr [ @.str.1, %19 ], [ %24, %20 ]
  br label %43

27:                                               ; preds = %10
  %28 = load i32, ptr @pre, align 4, !tbaa !5
  %29 = load i32, ptr @cur, align 4, !tbaa !5
  %30 = icmp slt i32 %28, %29
  %31 = zext i1 %30 to i32
  %32 = load i32, ptr @cur, align 4, !tbaa !5
  %33 = icmp eq i32 %32, 15
  br i1 %33, label %37, label %34

34:                                               ; preds = %27
  %35 = load i32, ptr @cur, align 4, !tbaa !5
  %36 = icmp eq i32 %35, 0
  br label %37

37:                                               ; preds = %34, %27
  %38 = phi i1 [ true, %27 ], [ %36, %34 ]
  %39 = zext i1 %38 to i32
  %40 = icmp ne i32 %31, %39
  %41 = zext i1 %40 to i64
  %42 = select i1 %40, ptr @.str.2, ptr @.str.3
  br label %43

43:                                               ; preds = %37, %25
  %44 = phi ptr [ %26, %25 ], [ %42, %37 ]
  %45 = call i32 @puts(ptr noundef %44)
  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"}


; 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
@pre = external dso_local local_unnamed_addr global i32, align 4
@cur = 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 [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 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 @n)
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %3 = add nsw i32 %2, -1
  store i32 %3, ptr @n, align 4, !tbaa !5
  %.not5 = icmp eq i32 %2, 0
  br i1 %.not5, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %4 = load i32, ptr @cur, align 4, !tbaa !5
  store i32 %4, ptr @pre, align 4, !tbaa !5
  %5 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @cur)
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %7 = add nsw i32 %6, -1
  store i32 %7, ptr @n, align 4, !tbaa !5
  %.not = icmp eq i32 %6, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %0
  %8 = load i32, ptr @pre, align 4, !tbaa !5
  %9 = icmp eq i32 %8, -1
  %10 = load i32, ptr @cur, align 4
  br i1 %9, label %11, label %12

11:                                               ; preds = %._crit_edge
  %switch.selectcmp = icmp eq i32 %10, 0
  %switch.select = select i1 %switch.selectcmp, ptr @.str.2, ptr @.str.1
  %switch.selectcmp3 = icmp eq i32 %10, 15
  %switch.select4 = select i1 %switch.selectcmp3, ptr @.str.3, ptr %switch.select
  br label %18

12:                                               ; preds = %._crit_edge
  %13 = icmp slt i32 %8, %10
  %14 = icmp ne i32 %10, 15
  %15 = icmp ne i32 %10, 0
  %16 = and i1 %14, %15
  %.not2 = xor i1 %13, %16
  %17 = select i1 %.not2, ptr @.str.3, ptr @.str.2
  br label %18

18:                                               ; preds = %11, %12
  %19 = phi ptr [ %17, %12 ], [ %switch.select4, %11 ]
  %20 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) %19)
  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"}


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