; LLVM IR from tangjz/acm-icpc :: 51nod (1419)

; 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
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = 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
  store i32 0, ptr %1, align 4
  br label %2

2:                                                ; preds = %47, %0
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  %4 = icmp eq i32 %3, 1
  br i1 %4, label %5, label %50

5:                                                ; preds = %2
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %7 = icmp slt i32 %6, 3
  br i1 %7, label %8, label %10

8:                                                ; preds = %5
  %9 = load i32, ptr @n, align 4, !tbaa !5
  br label %47

10:                                               ; preds = %5
  %11 = load i32, ptr @n, align 4, !tbaa !5
  %12 = and i32 %11, 1
  %13 = icmp ne i32 %12, 0
  br i1 %13, label %14, label %22

14:                                               ; preds = %10
  %15 = load i32, ptr @n, align 4, !tbaa !5
  %16 = load i32, ptr @n, align 4, !tbaa !5
  %17 = sub nsw i32 %16, 1
  %18 = mul nsw i32 %15, %17
  %19 = load i32, ptr @n, align 4, !tbaa !5
  %20 = sub nsw i32 %19, 2
  %21 = mul nsw i32 %18, %20
  br label %45

22:                                               ; preds = %10
  %23 = load i32, ptr @n, align 4, !tbaa !5
  %24 = srem i32 %23, 3
  %25 = icmp ne i32 %24, 0
  br i1 %25, label %26, label %34

26:                                               ; preds = %22
  %27 = load i32, ptr @n, align 4, !tbaa !5
  %28 = load i32, ptr @n, align 4, !tbaa !5
  %29 = sub nsw i32 %28, 1
  %30 = mul nsw i32 %27, %29
  %31 = load i32, ptr @n, align 4, !tbaa !5
  %32 = sub nsw i32 %31, 3
  %33 = mul nsw i32 %30, %32
  br label %43

34:                                               ; preds = %22
  %35 = load i32, ptr @n, align 4, !tbaa !5
  %36 = sub nsw i32 %35, 1
  %37 = load i32, ptr @n, align 4, !tbaa !5
  %38 = sub nsw i32 %37, 2
  %39 = mul nsw i32 %36, %38
  %40 = load i32, ptr @n, align 4, !tbaa !5
  %41 = sub nsw i32 %40, 3
  %42 = mul nsw i32 %39, %41
  br label %43

43:                                               ; preds = %34, %26
  %44 = phi i32 [ %33, %26 ], [ %42, %34 ]
  br label %45

45:                                               ; preds = %43, %14
  %46 = phi i32 [ %21, %14 ], [ %44, %43 ]
  br label %47

47:                                               ; preds = %45, %8
  %48 = phi i32 [ %9, %8 ], [ %46, %45 ]
  %49 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %48)
  br label %2, !llvm.loop !9

50:                                               ; preds = %2
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

declare i32 @printf(ptr noundef, ...) #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 = { "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"}


; 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
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = 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 @n)
  %2 = icmp eq i32 %1, 1
  br i1 %2, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %0, %24
  %3 = load i32, ptr @n, align 4, !tbaa !5
  %4 = icmp slt i32 %3, 3
  br i1 %4, label %24, label %5

5:                                                ; preds = %.lr.ph
  %6 = and i32 %3, 1
  %.not = icmp eq i32 %6, 0
  br i1 %.not, label %12, label %7

7:                                                ; preds = %5
  %8 = add nsw i32 %3, -1
  %9 = mul nuw nsw i32 %8, %3
  %10 = add nsw i32 %3, -2
  %11 = mul nsw i32 %9, %10
  br label %24

12:                                               ; preds = %5
  %13 = urem i32 %3, 3
  %.not1 = icmp eq i32 %13, 0
  %14 = add nsw i32 %3, -1
  br i1 %.not1, label %19, label %15

15:                                               ; preds = %12
  %16 = mul nsw i32 %14, %3
  %17 = add nsw i32 %3, -3
  %18 = mul nsw i32 %16, %17
  br label %24

19:                                               ; preds = %12
  %20 = add nsw i32 %3, -2
  %21 = mul nsw i32 %14, %20
  %22 = add nsw i32 %3, -3
  %23 = mul nsw i32 %21, %22
  br label %24

24:                                               ; preds = %.lr.ph, %7, %19, %15
  %25 = phi i32 [ %11, %7 ], [ %18, %15 ], [ %23, %19 ], [ %3, %.lr.ph ]
  %26 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %25)
  %27 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %28 = icmp eq i32 %27, 1
  br i1 %28, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %24, %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 = !{!"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: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass