; LLVM IR from VastoLorde95/Competitive-Programming :: Codeforces/Educational 14/Problem A (A)

; 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
@cnt = external dso_local global i32, align 4
@a = external dso_local global i32, align 4
@last = 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 [4 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %18, %0
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %7 = icmp slt i32 %5, %6
  br i1 %7, label %9, label %8

8:                                                ; preds = %4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  br label %21

9:                                                ; preds = %4
  %10 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @a)
  %11 = load i32, ptr @a, align 4, !tbaa !5
  %12 = icmp eq i32 %11, 1
  br i1 %12, label %13, label %17

13:                                               ; preds = %9
  %14 = load i32, ptr @cnt, align 4, !tbaa !5
  %15 = add nsw i32 %14, 1
  store i32 %15, ptr @cnt, align 4, !tbaa !5
  %16 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %16, ptr @last, align 4, !tbaa !5
  br label %17

17:                                               ; preds = %13, %9
  br label %18

18:                                               ; preds = %17
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = add nsw i32 %19, 1
  store i32 %20, ptr %2, align 4, !tbaa !5
  br label %4, !llvm.loop !9

21:                                               ; preds = %8
  %22 = load i32, ptr @n, align 4, !tbaa !5
  %23 = icmp eq i32 %22, 1
  br i1 %23, label %24, label %29

24:                                               ; preds = %21
  %25 = load i32, ptr @cnt, align 4, !tbaa !5
  %26 = icmp eq i32 %25, 1
  br i1 %26, label %27, label %29

27:                                               ; preds = %24
  %28 = call i32 @puts(ptr noundef @.str.1)
  br label %45

29:                                               ; preds = %24, %21
  %30 = load i32, ptr @n, align 4, !tbaa !5
  %31 = icmp eq i32 %30, 1
  br i1 %31, label %32, label %34

32:                                               ; preds = %29
  %33 = call i32 @puts(ptr noundef @.str.2)
  br label %44

34:                                               ; preds = %29
  %35 = load i32, ptr @cnt, align 4, !tbaa !5
  %36 = load i32, ptr @n, align 4, !tbaa !5
  %37 = sub nsw i32 %36, 1
  %38 = icmp eq i32 %35, %37
  br i1 %38, label %39, label %41

39:                                               ; preds = %34
  %40 = call i32 @puts(ptr noundef @.str.1)
  br label %43

41:                                               ; preds = %34
  %42 = call i32 @puts(ptr noundef @.str.2)
  br label %43

43:                                               ; preds = %41, %39
  br label %44

44:                                               ; preds = %43, %32
  br label %45

45:                                               ; preds = %44, %27
  ret i32 0
}

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

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

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" }
attributes #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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
@cnt = external dso_local local_unnamed_addr global i32, align 4
@a = external dso_local global i32, align 4
@last = 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 [4 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 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 = icmp sgt i32 %2, 0
  br i1 %3, label %.lr.ph, label %.thread

.thread:                                          ; preds = %0
  %4 = load i32, ptr @cnt, align 4
  br label %18

._crit_edge:                                      ; preds = %14
  %5 = icmp eq i32 %16, 1
  %6 = load i32, ptr @cnt, align 4
  %7 = icmp eq i32 %6, 1
  %or.cond = select i1 %5, i1 %7, i1 false
  %.str.1.mux = select i1 %or.cond, ptr @.str.1, ptr @.str.2
  br i1 %5, label %22, label %18

.lr.ph:                                           ; preds = %0, %14
  %.05 = phi i32 [ %15, %14 ], [ 0, %0 ]
  %8 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @a)
  %9 = load i32, ptr @a, align 4, !tbaa !5
  %10 = icmp eq i32 %9, 1
  br i1 %10, label %11, label %14

11:                                               ; preds = %.lr.ph
  %12 = load i32, ptr @cnt, align 4, !tbaa !5
  %13 = add nsw i32 %12, 1
  store i32 %13, ptr @cnt, align 4, !tbaa !5
  store i32 %.05, ptr @last, align 4, !tbaa !5
  br label %14

14:                                               ; preds = %.lr.ph, %11
  %15 = add nuw nsw i32 %.05, 1
  %16 = load i32, ptr @n, align 4, !tbaa !5
  %17 = icmp slt i32 %15, %16
  br i1 %17, label %.lr.ph, label %._crit_edge, !llvm.loop !9

18:                                               ; preds = %._crit_edge, %.thread
  %.lcssa911 = phi i32 [ %2, %.thread ], [ %16, %._crit_edge ]
  %19 = phi i32 [ %4, %.thread ], [ %6, %._crit_edge ]
  %20 = add nsw i32 %.lcssa911, -1
  %21 = icmp eq i32 %19, %20
  %.str.1..str.2 = select i1 %21, ptr @.str.1, ptr @.str.2
  br label %22

22:                                               ; preds = %._crit_edge, %18
  %.str.2.sink = phi ptr [ %.str.1.mux, %._crit_edge ], [ %.str.1..str.2, %18 ]
  %23 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) %.str.2.sink)
  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: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass