; LLVM IR from lzyrapx/Competitive-Programming :: HDUOJ (1800 (2))

; 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"

@n = external dso_local global i32, align 4
@f = external dso_local global [3005 x i32], align 16
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = 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 i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  br label %5

5:                                                ; preds = %58, %0
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  %7 = xor i32 %6, -1
  %8 = icmp ne i32 %7, 0
  br i1 %8, label %9, label %61

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

10:                                               ; preds = %19, %9
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = load i32, ptr @n, align 4, !tbaa !5
  %13 = icmp slt i32 %11, %12
  br i1 %13, label %14, label %22

14:                                               ; preds = %10
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [3005 x i32], ptr @f, i64 0, i64 %16
  %18 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %17)
  br label %19

19:                                               ; preds = %14
  %20 = load i32, ptr %2, align 4, !tbaa !5
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr %2, align 4, !tbaa !5
  br label %10, !llvm.loop !9

22:                                               ; preds = %10
  %23 = load i32, ptr @n, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds i32, ptr @f, i64 %24
  call void @_ZSt4sortIPiEvT_S1_(ptr noundef @f, ptr noundef %25)
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  store i32 1, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  store i32 1, ptr %4, align 4, !tbaa !5
  store i32 1, ptr %2, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %55, %22
  %27 = load i32, ptr %2, align 4, !tbaa !5
  %28 = load i32, ptr @n, align 4, !tbaa !5
  %29 = icmp slt i32 %27, %28
  br i1 %29, label %30, label %58

30:                                               ; preds = %26
  %31 = load i32, ptr %2, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [3005 x i32], ptr @f, i64 0, i64 %32
  %34 = load i32, ptr %33, align 4, !tbaa !5
  %35 = load i32, ptr %2, align 4, !tbaa !5
  %36 = sub nsw i32 %35, 1
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds [3005 x i32], ptr @f, i64 0, i64 %37
  %39 = load i32, ptr %38, align 4, !tbaa !5
  %40 = icmp sgt i32 %34, %39
  br i1 %40, label %41, label %42

41:                                               ; preds = %30
  store i32 1, ptr %4, align 4, !tbaa !5
  br label %54

42:                                               ; preds = %30
  %43 = load i32, ptr %4, align 4, !tbaa !5
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %4, align 4, !tbaa !5
  %45 = load i32, ptr %3, align 4, !tbaa !5
  %46 = load i32, ptr %4, align 4, !tbaa !5
  %47 = icmp sgt i32 %45, %46
  br i1 %47, label %48, label %50

48:                                               ; preds = %42
  %49 = load i32, ptr %3, align 4, !tbaa !5
  br label %52

50:                                               ; preds = %42
  %51 = load i32, ptr %4, align 4, !tbaa !5
  br label %52

52:                                               ; preds = %50, %48
  %53 = phi i32 [ %49, %48 ], [ %51, %50 ]
  store i32 %53, ptr %3, align 4, !tbaa !5
  br label %54

54:                                               ; preds = %52, %41
  br label %55

55:                                               ; preds = %54
  %56 = load i32, ptr %2, align 4, !tbaa !5
  %57 = add nsw i32 %56, 1
  store i32 %57, ptr %2, align 4, !tbaa !5
  br label %26, !llvm.loop !11

58:                                               ; preds = %26
  %59 = load i32, ptr %3, align 4, !tbaa !5
  %60 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %59)
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  br label %5, !llvm.loop !12

61:                                               ; preds = %5
  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

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIPiEvT_S1_(ptr noundef, ptr noundef) #3

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 = { inlinehint 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 #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 = !{!"int", !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"

@n = external dso_local global i32, align 4
@f = external dso_local global [3005 x i32], align 16
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress norecurse 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 @n)
  %.not26 = icmp eq i32 %1, -1
  br i1 %.not26, label %._crit_edge27, label %.preheader

.preheader:                                       ; preds = %0, %._crit_edge24
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %3 = icmp sgt i32 %2, 0
  br i1 %3, label %.lr.ph, label %.preheader.._crit_edge_crit_edge

.preheader.._crit_edge_crit_edge:                 ; preds = %.preheader
  %.pre33 = sext i32 %2 to i64
  br label %._crit_edge

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %.preheader ]
  %4 = getelementptr inbounds [3005 x i32], ptr @f, i64 0, i64 %indvars.iv
  %5 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %4)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %7 = sext i32 %6 to i64
  %8 = icmp slt i64 %indvars.iv.next, %7
  br i1 %8, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %.preheader.._crit_edge_crit_edge
  %.pre-phi = phi i64 [ %.pre33, %.preheader.._crit_edge_crit_edge ], [ %7, %.lr.ph ]
  %9 = getelementptr inbounds i32, ptr @f, i64 %.pre-phi
  tail call void @_ZSt4sortIPiEvT_S1_(ptr noundef nonnull @f, ptr noundef nonnull %9)
  %10 = load i32, ptr @n, align 4, !tbaa !5
  %11 = icmp sgt i32 %10, 1
  br i1 %11, label %.lr.ph23.preheader, label %._crit_edge24

.lr.ph23.preheader:                               ; preds = %._crit_edge
  %wide.trip.count = zext nneg i32 %10 to i64
  %.pre = load i32, ptr @f, align 16, !tbaa !5
  %12 = add nsw i64 %wide.trip.count, -1
  %xtraiter = and i64 %12, 1
  %13 = icmp eq i32 %10, 2
  br i1 %13, label %._crit_edge24.loopexit.unr-lcssa, label %.lr.ph23.preheader.new

.lr.ph23.preheader.new:                           ; preds = %.lr.ph23.preheader
  %unroll_iter = and i64 %12, -2
  br label %.lr.ph23

.lr.ph23:                                         ; preds = %.lr.ph23, %.lr.ph23.preheader.new
  %14 = phi i32 [ %.pre, %.lr.ph23.preheader.new ], [ %22, %.lr.ph23 ]
  %indvars.iv30 = phi i64 [ 1, %.lr.ph23.preheader.new ], [ %indvars.iv.next31.1, %.lr.ph23 ]
  %.021 = phi i32 [ 1, %.lr.ph23.preheader.new ], [ %.1.1, %.lr.ph23 ]
  %.01320 = phi i32 [ 1, %.lr.ph23.preheader.new ], [ %.114.1, %.lr.ph23 ]
  %niter = phi i64 [ 0, %.lr.ph23.preheader.new ], [ %niter.next.1, %.lr.ph23 ]
  %15 = getelementptr inbounds [3005 x i32], ptr @f, i64 0, i64 %indvars.iv30
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = icmp sgt i32 %16, %14
  %18 = add nsw i32 %.021, 1
  %19 = tail call i32 @llvm.smax.i32(i32 %.01320, i32 %18)
  %.114 = select i1 %17, i32 %.01320, i32 %19
  %20 = add nsw i32 %.021, 2
  %indvars.iv.next31 = add nuw nsw i64 %indvars.iv30, 1
  %21 = getelementptr inbounds [3005 x i32], ptr @f, i64 0, i64 %indvars.iv.next31
  %22 = load i32, ptr %21, align 4, !tbaa !5
  %23 = icmp sgt i32 %22, %16
  %24 = select i1 %17, i32 2, i32 %20
  %25 = tail call i32 @llvm.smax.i32(i32 %.114, i32 %24)
  %.114.1 = select i1 %23, i32 %.114, i32 %25
  %.1.1 = select i1 %23, i32 1, i32 %24
  %indvars.iv.next31.1 = add nuw nsw i64 %indvars.iv30, 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_edge24.loopexit.unr-lcssa, label %.lr.ph23, !llvm.loop !11

._crit_edge24.loopexit.unr-lcssa:                 ; preds = %.lr.ph23, %.lr.ph23.preheader
  %.114.lcssa.ph = phi i32 [ poison, %.lr.ph23.preheader ], [ %.114.1, %.lr.ph23 ]
  %.unr = phi i32 [ %.pre, %.lr.ph23.preheader ], [ %22, %.lr.ph23 ]
  %indvars.iv30.unr = phi i64 [ 1, %.lr.ph23.preheader ], [ %indvars.iv.next31.1, %.lr.ph23 ]
  %.021.unr = phi i32 [ 1, %.lr.ph23.preheader ], [ %.1.1, %.lr.ph23 ]
  %.01320.unr = phi i32 [ 1, %.lr.ph23.preheader ], [ %.114.1, %.lr.ph23 ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge24, label %.lr.ph23.epil

.lr.ph23.epil:                                    ; preds = %._crit_edge24.loopexit.unr-lcssa
  %26 = getelementptr inbounds [3005 x i32], ptr @f, i64 0, i64 %indvars.iv30.unr
  %27 = load i32, ptr %26, align 4, !tbaa !5
  %28 = icmp sgt i32 %27, %.unr
  %29 = add nsw i32 %.021.unr, 1
  %30 = tail call i32 @llvm.smax.i32(i32 %.01320.unr, i32 %29)
  %.114.epil = select i1 %28, i32 %.01320.unr, i32 %30
  br label %._crit_edge24

._crit_edge24:                                    ; preds = %.lr.ph23.epil, %._crit_edge24.loopexit.unr-lcssa, %._crit_edge
  %.013.lcssa = phi i32 [ 1, %._crit_edge ], [ %.114.lcssa.ph, %._crit_edge24.loopexit.unr-lcssa ], [ %.114.epil, %.lr.ph23.epil ]
  %31 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %.013.lcssa)
  %32 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %.not = icmp eq i32 %32, -1
  br i1 %.not, label %._crit_edge27, label %.preheader, !llvm.loop !12

._crit_edge27:                                    ; preds = %._crit_edge24, %0
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIPiEvT_S1_(ptr noundef, ptr noundef) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #3

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 = { 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 #2 = { inlinehint 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 #3 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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 = !{!"int", !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: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass