; LLVM IR from DionysiosB/CodeForces :: 1300-1399 (1374B-MultiplyBy2DivideBy6)

; 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 [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 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)
  br label %8

8:                                                ; preds = %49, %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 %50

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %13 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %3)
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %14 = load i64, ptr %3, align 8, !tbaa !5
  store i64 %14, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  store i64 0, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  store i64 0, ptr %6, align 8, !tbaa !5
  br label %15

15:                                               ; preds = %19, %12
  %16 = load i64, ptr %4, align 8, !tbaa !5
  %17 = srem i64 %16, 2
  %18 = icmp eq i64 %17, 0
  br i1 %18, label %19, label %24

19:                                               ; preds = %15
  %20 = load i64, ptr %5, align 8, !tbaa !5
  %21 = add nsw i64 %20, 1
  store i64 %21, ptr %5, align 8, !tbaa !5
  %22 = load i64, ptr %4, align 8, !tbaa !5
  %23 = sdiv i64 %22, 2
  store i64 %23, ptr %4, align 8, !tbaa !5
  br label %15, !llvm.loop !9

24:                                               ; preds = %15
  br label %25

25:                                               ; preds = %29, %24
  %26 = load i64, ptr %4, align 8, !tbaa !5
  %27 = srem i64 %26, 3
  %28 = icmp eq i64 %27, 0
  br i1 %28, label %29, label %34

29:                                               ; preds = %25
  %30 = load i64, ptr %6, align 8, !tbaa !5
  %31 = add nsw i64 %30, 1
  store i64 %31, ptr %6, align 8, !tbaa !5
  %32 = load i64, ptr %4, align 8, !tbaa !5
  %33 = sdiv i64 %32, 3
  store i64 %33, ptr %4, align 8, !tbaa !5
  br label %25, !llvm.loop !11

34:                                               ; preds = %25
  %35 = load i64, ptr %4, align 8, !tbaa !5
  %36 = icmp ne i64 %35, 1
  br i1 %36, label %41, label %37

37:                                               ; preds = %34
  %38 = load i64, ptr %6, align 8, !tbaa !5
  %39 = load i64, ptr %5, align 8, !tbaa !5
  %40 = icmp slt i64 %38, %39
  br i1 %40, label %41, label %43

41:                                               ; preds = %37, %34
  %42 = call i32 @puts(ptr noundef @.str.1)
  br label %49

43:                                               ; preds = %37
  %44 = load i64, ptr %6, align 8, !tbaa !5
  %45 = mul nsw i64 2, %44
  %46 = load i64, ptr %5, align 8, !tbaa !5
  %47 = sub nsw i64 %45, %46
  %48 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i64 noundef %47)
  br label %49

49:                                               ; preds = %43, %41
  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
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  br label %8, !llvm.loop !12

50:                                               ; preds = %8
  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

declare i32 @puts(ptr noundef) #2

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

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { 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}
!12 = distinct !{!12, !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 [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
  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
  %.not22 = icmp eq i64 %4, 0
  br i1 %.not22, label %._crit_edge25, label %.lr.ph24

.lr.ph24:                                         ; preds = %0, %27
  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)
  %7 = load i64, ptr %2, align 8, !tbaa !5
  %8 = and i64 %7, 1
  %9 = icmp eq i64 %8, 0
  br i1 %9, label %.lr.ph, label %.preheader

.preheader:                                       ; preds = %.lr.ph, %.lr.ph24
  %.012.lcssa = phi i64 [ %7, %.lr.ph24 ], [ %13, %.lr.ph ]
  %.011.lcssa = phi i64 [ 0, %.lr.ph24 ], [ %12, %.lr.ph ]
  %10 = srem i64 %.012.lcssa, 3
  %11 = icmp eq i64 %10, 0
  br i1 %11, label %.lr.ph19, label %._crit_edge

.lr.ph:                                           ; preds = %.lr.ph24, %.lr.ph
  %.01115 = phi i64 [ %12, %.lr.ph ], [ 0, %.lr.ph24 ]
  %.01214 = phi i64 [ %13, %.lr.ph ], [ %7, %.lr.ph24 ]
  %12 = add nuw nsw i64 %.01115, 1
  %13 = ashr exact i64 %.01214, 1
  %14 = and i64 %.01214, 2
  %15 = icmp eq i64 %14, 0
  br i1 %15, label %.lr.ph, label %.preheader, !llvm.loop !9

.lr.ph19:                                         ; preds = %.preheader, %.lr.ph19
  %.018 = phi i64 [ %16, %.lr.ph19 ], [ 0, %.preheader ]
  %.117 = phi i64 [ %17, %.lr.ph19 ], [ %.012.lcssa, %.preheader ]
  %16 = add nuw nsw i64 %.018, 1
  %17 = sdiv i64 %.117, 3
  %18 = srem i64 %17, 3
  %19 = icmp eq i64 %18, 0
  br i1 %19, label %.lr.ph19, label %._crit_edge, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph19, %.preheader
  %.1.lcssa = phi i64 [ %.012.lcssa, %.preheader ], [ %17, %.lr.ph19 ]
  %.0.lcssa = phi i64 [ 0, %.preheader ], [ %16, %.lr.ph19 ]
  %.not13 = icmp ne i64 %.1.lcssa, 1
  %20 = icmp ult i64 %.0.lcssa, %.011.lcssa
  %or.cond = select i1 %.not13, i1 true, i1 %20
  br i1 %or.cond, label %21, label %23

21:                                               ; preds = %._crit_edge
  %22 = call i32 @puts(ptr noundef nonnull dereferenceable(1) @.str.1)
  br label %27

23:                                               ; preds = %._crit_edge
  %24 = shl nuw nsw i64 %.0.lcssa, 1
  %25 = sub nsw i64 %24, %.011.lcssa
  %26 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i64 noundef %25)
  br label %27

27:                                               ; preds = %23, %21
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  %28 = load i64, ptr %1, align 8, !tbaa !5
  %29 = add nsw i64 %28, -1
  store i64 %29, ptr %1, align 8, !tbaa !5
  %.not = icmp eq i64 %28, 0
  br i1 %.not, label %._crit_edge25, label %.lr.ph24, !llvm.loop !12

._crit_edge25:                                    ; preds = %27, %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: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @printf(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

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}
!12 = distinct !{!12, !10}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass