; LLVM IR from lzyrapx/Competitive-Programming :: HDUOJ (1597)

; 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"

@a = external dso_local global i64, align 8
@b = external dso_local global i64, align 8
@.str = external hidden unnamed_addr constant [5 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 [6 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
  store i32 0, ptr %1, align 4
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @a)
  br label %4

4:                                                ; preds = %30, %0
  %5 = load i64, ptr @a, align 8, !tbaa !5
  %6 = add nsw i64 %5, -1
  store i64 %6, ptr @a, align 8, !tbaa !5
  %7 = icmp ne i64 %5, 0
  br i1 %7, label %8, label %31

8:                                                ; preds = %4
  %9 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef @b)
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  store i64 1, ptr %2, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %14, %8
  %11 = load i64, ptr @b, align 8, !tbaa !5
  %12 = load i64, ptr %2, align 8, !tbaa !5
  %13 = icmp sgt i64 %11, %12
  br i1 %13, label %14, label %20

14:                                               ; preds = %10
  %15 = load i64, ptr %2, align 8, !tbaa !5
  %16 = load i64, ptr @b, align 8, !tbaa !5
  %17 = sub nsw i64 %16, %15
  store i64 %17, ptr @b, align 8, !tbaa !5
  %18 = load i64, ptr %2, align 8, !tbaa !5
  %19 = add nsw i64 %18, 1
  store i64 %19, ptr %2, align 8, !tbaa !5
  br label %10, !llvm.loop !9

20:                                               ; preds = %10
  %21 = load i64, ptr @b, align 8, !tbaa !5
  %22 = srem i64 %21, 9
  %23 = icmp eq i64 %22, 0
  br i1 %23, label %24, label %26

24:                                               ; preds = %20
  %25 = call i32 (ptr, ...) @printf(ptr noundef @.str.2)
  br label %30

26:                                               ; preds = %20
  %27 = load i64, ptr @b, align 8, !tbaa !5
  %28 = srem i64 %27, 9
  %29 = call i32 (ptr, ...) @printf(ptr noundef @.str.3, i64 noundef %28)
  br label %30

30:                                               ; preds = %26, %24
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  br label %4, !llvm.loop !11

31:                                               ; preds = %4
  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

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

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

@a = external dso_local global i64, align 8
@b = external dso_local global i64, align 8
@.str = external hidden unnamed_addr constant [5 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 [6 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 @a)
  %2 = load i64, ptr @a, align 8, !tbaa !5
  %3 = add nsw i64 %2, -1
  store i64 %3, ptr @a, align 8, !tbaa !5
  %.not7 = icmp eq i64 %2, 0
  br i1 %.not7, label %._crit_edge10, label %.lr.ph9

.lr.ph9:                                          ; preds = %0, %17
  %4 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull @b)
  %b.promoted = load i64, ptr @b, align 8, !tbaa !5
  %5 = icmp sgt i64 %b.promoted, 1
  br i1 %5, label %.lr.ph, label %10

.lr.ph:                                           ; preds = %.lr.ph9, %.lr.ph
  %.05 = phi i64 [ %8, %.lr.ph ], [ 1, %.lr.ph9 ]
  %6 = phi i64 [ %7, %.lr.ph ], [ %b.promoted, %.lr.ph9 ]
  %7 = sub nsw i64 %6, %.05
  %8 = add nuw nsw i64 %.05, 1
  %9 = icmp sgt i64 %7, %8
  br i1 %9, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph
  store i64 %7, ptr @b, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %._crit_edge, %.lr.ph9
  %.lcssa = phi i64 [ %7, %._crit_edge ], [ %b.promoted, %.lr.ph9 ]
  %11 = srem i64 %.lcssa, 9
  %12 = icmp eq i64 %11, 0
  br i1 %12, label %13, label %15

13:                                               ; preds = %10
  %14 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2)
  br label %17

15:                                               ; preds = %10
  %16 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3, i64 noundef %11)
  br label %17

17:                                               ; preds = %15, %13
  %18 = load i64, ptr @a, align 8, !tbaa !5
  %19 = add nsw i64 %18, -1
  store i64 %19, ptr @a, align 8, !tbaa !5
  %.not = icmp eq i64 %18, 0
  br i1 %.not, label %._crit_edge10, label %.lr.ph9, !llvm.loop !11

._crit_edge10:                                    ; preds = %17, %0
  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 @printf(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 = !{!"long 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: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass