; LLVM IR from tangjz/acm-icpc :: lydsy (4802)

; 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"

@cnt = external dso_local global i32, align 4
@n = external dso_local global i64, align 8
@pp = external dso_local global [16 x i64], align 16
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z13decompositionx(i64 noundef) #1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #2 {
  %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)
  %4 = load i64, ptr @n, align 8, !tbaa !5
  %5 = icmp eq i64 %4, 1
  br i1 %5, label %6, label %8

6:                                                ; preds = %0
  %7 = call i32 @puts(ptr noundef @.str.1)
  store i32 0, ptr %1, align 4
  br label %30

8:                                                ; preds = %0
  %9 = load i64, ptr @n, align 8, !tbaa !5
  call void @_Z13decompositionx(i64 noundef %9)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  store i32 0, ptr %2, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %24, %8
  %11 = load i32, ptr %2, align 4, !tbaa !9
  %12 = load i32, ptr @cnt, align 4, !tbaa !9
  %13 = icmp slt i32 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  br label %27

15:                                               ; preds = %10
  %16 = load i64, ptr @n, align 8, !tbaa !5
  %17 = load i32, ptr %2, align 4, !tbaa !9
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [16 x i64], ptr @pp, i64 0, i64 %18
  %20 = load i64, ptr %19, align 8, !tbaa !5
  %21 = sdiv i64 %16, %20
  %22 = load i64, ptr @n, align 8, !tbaa !5
  %23 = sub nsw i64 %22, %21
  store i64 %23, ptr @n, align 8, !tbaa !5
  br label %24

24:                                               ; preds = %15
  %25 = load i32, ptr %2, align 4, !tbaa !9
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr %2, align 4, !tbaa !9
  br label %10, !llvm.loop !11

27:                                               ; preds = %14
  %28 = load i64, ptr @n, align 8, !tbaa !5
  %29 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i64 noundef %28)
  store i32 0, ptr %1, align 4
  br label %30

30:                                               ; preds = %27, %6
  %31 = load i32, ptr %1, align 4
  ret i32 %31
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #3

declare i32 @puts(ptr noundef) #3

declare i32 @printf(ptr noundef, ...) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 #2 = { 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 #3 = { "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 #4 = { 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 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@cnt = external dso_local local_unnamed_addr global i32, align 4
@n = external dso_local global i64, align 8
@pp = external dso_local local_unnamed_addr global [16 x i64], align 16
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z13decompositionx(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %2 = load i64, ptr @n, align 8, !tbaa !5
  %3 = icmp eq i64 %2, 1
  br i1 %3, label %4, label %6

4:                                                ; preds = %0
  %5 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) @.str.1)
  br label %26

6:                                                ; preds = %0
  tail call void @_Z13decompositionx(i64 noundef %2)
  %7 = load i32, ptr @cnt, align 4, !tbaa !9
  %n.promoted = load i64, ptr @n, align 8, !tbaa !5
  %8 = icmp sgt i32 %7, 0
  br i1 %8, label %.lr.ph.preheader, label %14

.lr.ph.preheader:                                 ; preds = %6
  %wide.trip.count = zext nneg i32 %7 to i64
  %xtraiter = and i64 %wide.trip.count, 1
  %9 = icmp eq i32 %7, 1
  br i1 %9, label %._crit_edge.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %wide.trip.count, 2147483646
  br label %.lr.ph

._crit_edge.unr-lcssa:                            ; preds = %.lr.ph, %.lr.ph.preheader
  %.lcssa.ph = phi i64 [ poison, %.lr.ph.preheader ], [ %25, %.lr.ph ]
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next.1, %.lr.ph ]
  %.unr = phi i64 [ %n.promoted, %.lr.ph.preheader ], [ %25, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.unr-lcssa
  %10 = getelementptr inbounds [16 x i64], ptr @pp, i64 0, i64 %indvars.iv.unr
  %11 = load i64, ptr %10, align 8, !tbaa !5
  %12 = sdiv i64 %.unr, %11
  %13 = sub nsw i64 %.unr, %12
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.unr-lcssa, %.lr.ph.epil
  %.lcssa = phi i64 [ %.lcssa.ph, %._crit_edge.unr-lcssa ], [ %13, %.lr.ph.epil ]
  store i64 %.lcssa, ptr @n, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %._crit_edge, %6
  %15 = phi i64 [ %.lcssa, %._crit_edge ], [ %n.promoted, %6 ]
  %16 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i64 noundef %15)
  br label %26

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader.new ], [ %indvars.iv.next.1, %.lr.ph ]
  %17 = phi i64 [ %n.promoted, %.lr.ph.preheader.new ], [ %25, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %18 = getelementptr inbounds [16 x i64], ptr @pp, i64 0, i64 %indvars.iv
  %19 = load i64, ptr %18, align 16, !tbaa !5
  %20 = sdiv i64 %17, %19
  %21 = sub nsw i64 %17, %20
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %22 = getelementptr inbounds [16 x i64], ptr @pp, i64 0, i64 %indvars.iv.next
  %23 = load i64, ptr %22, align 8, !tbaa !5
  %24 = sdiv i64 %21, %23
  %25 = sub nsw i64 %21, %24
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %._crit_edge.unr-lcssa, label %.lr.ph, !llvm.loop !11

26:                                               ; preds = %14, %4
  ret i32 0
}

; 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

attributes #0 = { mustprogress 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 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 #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" }

!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 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass