; LLVM IR from tangjz/acm-icpc :: lydsy/5455.ll (Z1Fx)

; 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"

@f = external dso_local global [5000001 x i32], align 16
@nLim = external dso_local global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z1Fx(i64 noundef %0) #0 {
  %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
  %7 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  %8 = load i64, ptr %3, align 8, !tbaa !5
  %9 = load i32, ptr @nLim, align 4, !tbaa !9
  %10 = sext i32 %9 to i64
  %11 = icmp slt i64 %8, %10
  br i1 %11, label %12, label %17

12:                                               ; preds = %1
  %13 = load i64, ptr %3, align 8, !tbaa !5
  %14 = getelementptr inbounds [5000001 x i32], ptr @f, i64 0, i64 %13
  %15 = load i32, ptr %14, align 4, !tbaa !9
  %16 = sext i32 %15 to i64
  store i64 %16, ptr %2, align 8
  br label %42

17:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 0, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  br label %18

18:                                               ; preds = %38, %17
  %19 = load i64, ptr %5, align 8, !tbaa !5
  %20 = load i64, ptr %3, align 8, !tbaa !5
  %21 = icmp slt i64 %19, %20
  br i1 %21, label %23, label %22

22:                                               ; preds = %18
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  br label %40

23:                                               ; preds = %18
  %24 = load i64, ptr %3, align 8, !tbaa !5
  %25 = load i64, ptr %5, align 8, !tbaa !5
  %26 = add nsw i64 %25, 1
  %27 = sdiv i64 %24, %26
  store i64 %27, ptr %7, align 8, !tbaa !5
  %28 = load i64, ptr %3, align 8, !tbaa !5
  %29 = load i64, ptr %7, align 8, !tbaa !5
  %30 = sdiv i64 %28, %29
  store i64 %30, ptr %6, align 8, !tbaa !5
  %31 = load i64, ptr %6, align 8, !tbaa !5
  %32 = load i64, ptr %5, align 8, !tbaa !5
  %33 = sub nsw i64 %31, %32
  %34 = load i64, ptr %7, align 8, !tbaa !5
  %35 = mul nsw i64 %33, %34
  %36 = load i64, ptr %4, align 8, !tbaa !5
  %37 = add nsw i64 %36, %35
  store i64 %37, ptr %4, align 8, !tbaa !5
  br label %38

38:                                               ; preds = %23
  %39 = load i64, ptr %6, align 8, !tbaa !5
  store i64 %39, ptr %5, align 8, !tbaa !5
  br label %18, !llvm.loop !11

40:                                               ; preds = %22
  %41 = load i64, ptr %4, align 8, !tbaa !5
  store i64 %41, ptr %2, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %42

42:                                               ; preds = %40, %12
  %43 = load i64, ptr %2, align 8
  ret i64 %43
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { mustprogress 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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"

@f = external dso_local local_unnamed_addr global [5000001 x i32], align 16
@nLim = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i64 @_Z1Fx(i64 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @nLim, align 4, !tbaa !5
  %3 = sext i32 %2 to i64
  %4 = icmp sgt i64 %3, %0
  br i1 %4, label %6, label %.preheader

.preheader:                                       ; preds = %1
  %5 = icmp sgt i64 %0, 0
  br i1 %5, label %.lr.ph, label %.loopexit

6:                                                ; preds = %1
  %7 = getelementptr inbounds [5000001 x i32], ptr @f, i64 0, i64 %0
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %9 = sext i32 %8 to i64
  br label %.loopexit

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.01519 = phi i64 [ %15, %.lr.ph ], [ 0, %.preheader ]
  %.01618 = phi i64 [ %12, %.lr.ph ], [ 0, %.preheader ]
  %10 = add nuw nsw i64 %.01618, 1
  %11 = udiv i64 %0, %10
  %12 = udiv i64 %0, %11
  %13 = sub nsw i64 %12, %.01618
  %14 = mul nsw i64 %13, %11
  %15 = add nsw i64 %14, %.01519
  %16 = icmp slt i64 %12, %0
  br i1 %16, label %.lr.ph, label %.loopexit, !llvm.loop !9

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %6
  %.0 = phi i64 [ %9, %6 ], [ 0, %.preheader ], [ %15, %.lr.ph ]
  ret i64 %.0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) 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" }

!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"}


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