; LLVM IR from DionysiosB/CodeForces :: 0700-0799 (768E-GameOfStones)

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

8:                                                ; preds = %25, %0
  %9 = load i64, ptr %2, align 8, !tbaa !5
  %10 = add nsw i64 %9, -1
  store i64 %10, ptr %2, align 8, !tbaa !5
  %11 = icmp ne i64 %9, 0
  br i1 %11, label %12, label %29

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %13 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %4)
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  store i64 1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  store i64 1, ptr %6, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %18, %12
  %15 = load i64, ptr %4, align 8, !tbaa !5
  %16 = load i64, ptr %5, align 8, !tbaa !5
  %17 = icmp sge i64 %15, %16
  br i1 %17, label %18, label %25

18:                                               ; preds = %14
  %19 = load i64, ptr %5, align 8, !tbaa !5
  %20 = load i64, ptr %4, align 8, !tbaa !5
  %21 = sub nsw i64 %20, %19
  store i64 %21, ptr %4, align 8, !tbaa !5
  %22 = load i64, ptr %5, align 8, !tbaa !5
  store i64 %22, ptr %6, align 8, !tbaa !5
  %23 = load i64, ptr %5, align 8, !tbaa !5
  %24 = add nsw i64 %23, 1
  store i64 %24, ptr %5, align 8, !tbaa !5
  br label %14, !llvm.loop !9

25:                                               ; preds = %14
  %26 = load i64, ptr %6, align 8, !tbaa !5
  %27 = load i64, ptr %3, align 8, !tbaa !5
  %28 = xor i64 %27, %26
  store i64 %28, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %8, !llvm.loop !11

29:                                               ; preds = %8
  %30 = load i64, ptr %3, align 8, !tbaa !5
  %31 = icmp ne i64 %30, 0
  %32 = zext i1 %31 to i64
  %33 = select i1 %31, ptr @.str.1, ptr @.str.2
  %34 = call i32 @puts(ptr noundef %33)
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  ret i32 0
}

; 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 @puts(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 = 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"

@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 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
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %1) #3
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1)
  %4 = load i64, ptr %1, align 8, !tbaa !5
  %5 = add nsw i64 %4, -1
  store i64 %5, ptr %1, align 8, !tbaa !5
  %.not14 = icmp eq i64 %4, 0
  br i1 %.not14, label %._crit_edge18, label %.lr.ph17

.lr.ph17:                                         ; preds = %0, %._crit_edge
  %.0815 = phi i64 [ %10, %._crit_edge ], [ 0, %0 ]
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %2)
  %.promoted = load i64, ptr %2, align 8, !tbaa !5
  %.not1112 = icmp slt i64 %.promoted, 1
  br i1 %.not1112, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph17, %.lr.ph
  %.0713 = phi i64 [ %9, %.lr.ph ], [ 1, %.lr.ph17 ]
  %7 = phi i64 [ %8, %.lr.ph ], [ %.promoted, %.lr.ph17 ]
  %8 = sub nsw i64 %7, %.0713
  %9 = add nuw nsw i64 %.0713, 1
  %.not11.not = icmp sgt i64 %8, %.0713
  br i1 %.not11.not, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %.lr.ph17
  %.0.lcssa = phi i64 [ 1, %.lr.ph17 ], [ %.0713, %.lr.ph ]
  %10 = xor i64 %.0.lcssa, %.0815
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  %11 = load i64, ptr %1, align 8, !tbaa !5
  %12 = add nsw i64 %11, -1
  store i64 %12, ptr %1, align 8, !tbaa !5
  %.not = icmp eq i64 %11, 0
  br i1 %.not, label %._crit_edge18.loopexit, label %.lr.ph17, !llvm.loop !11

._crit_edge18.loopexit:                           ; preds = %._crit_edge
  %13 = icmp eq i64 %.0.lcssa, %.0815
  %14 = select i1 %13, ptr @.str.2, ptr @.str.1
  br label %._crit_edge18

._crit_edge18:                                    ; preds = %._crit_edge18.loopexit, %0
  %.08.lcssa = phi ptr [ @.str.2, %0 ], [ %14, %._crit_edge18.loopexit ]
  %15 = call i32 @puts(ptr noundef nonnull dereferenceable(1) %.08.lcssa)
  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 @puts(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: DSEPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass