; LLVM IR from DionysiosB/CodeForces :: 1806B-MexMaster (main)

; 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"

@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = 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
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i8, align 1
  %6 = alloca i8, align 1
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  %9 = alloca i64, align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  %10 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2)
  br label %11

11:                                               ; preds = %58, %0
  %12 = load i64, ptr %2, align 8, !tbaa !5
  %13 = add nsw i64 %12, -1
  store i64 %13, ptr %2, align 8, !tbaa !5
  %14 = icmp ne i64 %12, 0
  br i1 %14, label %15, label %61

15:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %16 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %3)
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  store i64 0, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %5) #3
  store i8 0, ptr %5, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 1, ptr %6) #3
  store i8 0, ptr %6, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  store i64 0, ptr %7, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %40, %15
  %18 = load i64, ptr %7, align 8, !tbaa !5
  %19 = load i64, ptr %3, align 8, !tbaa !5
  %20 = icmp slt i64 %18, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  br label %43

22:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %23 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %8)
  %24 = load i64, ptr %8, align 8, !tbaa !5
  %25 = icmp eq i64 %24, 0
  br i1 %25, label %26, label %29

26:                                               ; preds = %22
  %27 = load i64, ptr %4, align 8, !tbaa !5
  %28 = add nsw i64 %27, 1
  store i64 %28, ptr %4, align 8, !tbaa !5
  br label %39

29:                                               ; preds = %22
  %30 = load i64, ptr %8, align 8, !tbaa !5
  %31 = icmp eq i64 %30, 1
  br i1 %31, label %32, label %33

32:                                               ; preds = %29
  store i8 1, ptr %5, align 1, !tbaa !9
  br label %38

33:                                               ; preds = %29
  %34 = load i64, ptr %8, align 8, !tbaa !5
  %35 = icmp sgt i64 %34, 1
  br i1 %35, label %36, label %37

36:                                               ; preds = %33
  store i8 1, ptr %6, align 1, !tbaa !9
  br label %37

37:                                               ; preds = %36, %33
  br label %38

38:                                               ; preds = %37, %32
  br label %39

39:                                               ; preds = %38, %26
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  br label %40

40:                                               ; preds = %39
  %41 = load i64, ptr %7, align 8, !tbaa !5
  %42 = add nsw i64 %41, 1
  store i64 %42, ptr %7, align 8, !tbaa !5
  br label %17, !llvm.loop !11

43:                                               ; preds = %21
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  store i64 0, ptr %9, align 8, !tbaa !5
  %44 = load i64, ptr %4, align 8, !tbaa !5
  %45 = load i64, ptr %3, align 8, !tbaa !5
  %46 = add nsw i64 %45, 1
  %47 = sdiv i64 %46, 2
  %48 = icmp sgt i64 %44, %47
  br i1 %48, label %49, label %58

49:                                               ; preds = %43
  %50 = load i8, ptr %5, align 1, !tbaa !9, !range !13, !noundef !14
  %51 = trunc i8 %50 to i1
  br i1 %51, label %52, label %55

52:                                               ; preds = %49
  %53 = load i8, ptr %6, align 1, !tbaa !9, !range !13, !noundef !14
  %54 = trunc i8 %53 to i1
  br i1 %54, label %55, label %56

55:                                               ; preds = %52, %49
  store i64 1, ptr %9, align 8, !tbaa !5
  br label %57

56:                                               ; preds = %52
  store i64 2, ptr %9, align 8, !tbaa !5
  br label %57

57:                                               ; preds = %56, %55
  br label %58

58:                                               ; preds = %57, %43
  %59 = load i64, ptr %9, align 8, !tbaa !5
  %60 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i64 noundef %59)
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  br label %11, !llvm.loop !15

61:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  %62 = load i32, ptr %1, align 4
  ret i32 %62
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

declare i32 @printf(ptr noundef, ...) #2

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 = { 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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !12}


; 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"

@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = 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 = alloca i64, align 8
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %1) #3
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1)
  %5 = load i64, ptr %1, align 8, !tbaa !5
  %6 = add nsw i64 %5, -1
  store i64 %6, ptr %1, align 8, !tbaa !5
  %.not25 = icmp eq i64 %5, 0
  br i1 %.not25, label %._crit_edge28, label %.lr.ph27

.lr.ph27:                                         ; preds = %0, %14
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  %7 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %2)
  %8 = load i64, ptr %2, align 8, !tbaa !5
  %9 = icmp sgt i64 %8, 0
  br i1 %9, label %.lr.ph, label %.thread

.thread:                                          ; preds = %.lr.ph27
  %10 = icmp slt i64 %8, -2
  br label %14

._crit_edge:                                      ; preds = %26
  %11 = add nsw i64 %28, 1
  %12 = sdiv i64 %11, 2
  %13 = icmp sgt i64 %.113, %12
  %. = select i1 %.1, i64 1, i64 2
  %spec.select40 = select i1 %.111, i64 %., i64 1
  br label %14

14:                                               ; preds = %._crit_edge, %.thread
  %15 = phi i1 [ %10, %.thread ], [ %13, %._crit_edge ]
  %16 = phi i64 [ 1, %.thread ], [ %spec.select40, %._crit_edge ]
  %.0 = select i1 %15, i64 %16, i64 0
  %17 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i64 noundef %.0)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  %18 = load i64, ptr %1, align 8, !tbaa !5
  %19 = add nsw i64 %18, -1
  store i64 %19, ptr %1, align 8, !tbaa !5
  %.not = icmp eq i64 %18, 0
  br i1 %.not, label %._crit_edge28, label %.lr.ph27, !llvm.loop !9

.lr.ph:                                           ; preds = %.lr.ph27, %26
  %.0821 = phi i64 [ %27, %26 ], [ 0, %.lr.ph27 ]
  %.0920 = phi i1 [ %.1, %26 ], [ false, %.lr.ph27 ]
  %.01019 = phi i1 [ %.111, %26 ], [ false, %.lr.ph27 ]
  %.01218 = phi i64 [ %.113, %26 ], [ 0, %.lr.ph27 ]
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  %20 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %3)
  %21 = load i64, ptr %3, align 8, !tbaa !5
  switch i64 %21, label %24 [
    i64 0, label %22
    i64 1, label %26
  ]

22:                                               ; preds = %.lr.ph
  %23 = add nsw i64 %.01218, 1
  br label %26

24:                                               ; preds = %.lr.ph
  %25 = icmp sgt i64 %21, 1
  %spec.select = select i1 %25, i1 true, i1 %.0920
  br label %26

26:                                               ; preds = %24, %.lr.ph, %22
  %.113 = phi i64 [ %23, %22 ], [ %.01218, %.lr.ph ], [ %.01218, %24 ]
  %.111 = phi i1 [ %.01019, %22 ], [ true, %.lr.ph ], [ %.01019, %24 ]
  %.1 = phi i1 [ %.0920, %22 ], [ %.0920, %.lr.ph ], [ %spec.select, %24 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  %27 = add nuw nsw i64 %.0821, 1
  %28 = load i64, ptr %2, align 8, !tbaa !5
  %29 = icmp slt i64 %27, %28
  br i1 %29, label %.lr.ph, label %._crit_edge, !llvm.loop !11

._crit_edge28:                                    ; preds = %14, %0
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %1) #3
  ret i32 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: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #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 = !{!"long", !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: AggressiveInstCombinePass,CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass