; LLVM IR from tangjz/acm-icpc :: 51nod (1013)

; 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"

@.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
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 3, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 1, ptr %4, align 4, !tbaa !5
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %3)
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = add nsw i32 %6, 1
  store i32 %7, ptr %3, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %24, %0
  %9 = load i32, ptr %3, align 4, !tbaa !5
  %10 = icmp sgt i32 %9, 0
  br i1 %10, label %11, label %34

11:                                               ; preds = %8
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = and i32 %12, 1
  %14 = icmp ne i32 %13, 0
  br i1 %14, label %15, label %23

15:                                               ; preds = %11
  %16 = load i32, ptr %4, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = mul nsw i64 %17, %19
  %21 = srem i64 %20, 1000000007
  %22 = trunc i64 %21 to i32
  store i32 %22, ptr %4, align 4, !tbaa !5
  br label %23

23:                                               ; preds = %15, %11
  br label %24

24:                                               ; preds = %23
  %25 = load i32, ptr %3, align 4, !tbaa !5
  %26 = ashr i32 %25, 1
  store i32 %26, ptr %3, align 4, !tbaa !5
  %27 = load i32, ptr %2, align 4, !tbaa !5
  %28 = sext i32 %27 to i64
  %29 = load i32, ptr %2, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = mul nsw i64 %28, %30
  %32 = srem i64 %31, 1000000007
  %33 = trunc i64 %32 to i32
  store i32 %33, ptr %2, align 4, !tbaa !5
  br label %8, !llvm.loop !9

34:                                               ; preds = %8
  %35 = load i32, ptr %4, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = sub nsw i64 %36, 1
  %38 = mul nsw i64 %37, 500000004
  %39 = srem i64 %38, 1000000007
  %40 = trunc i64 %39 to i32
  store i32 %40, ptr %4, align 4, !tbaa !5
  %41 = load i32, ptr %4, align 4, !tbaa !5
  %42 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %41)
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  ret i32 0
}

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

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

declare i32 @printf(ptr noundef, ...) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 = { 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"}


; 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"

@.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 nofree norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  %2 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1)
  %3 = load i32, ptr %1, align 4, !tbaa !5
  %4 = add nsw i32 %3, 1
  store i32 %4, ptr %1, align 4, !tbaa !5
  %5 = icmp sgt i32 %3, -1
  br i1 %5, label %.lr.ph, label %24

.lr.ph:                                           ; preds = %0, %14
  %.09 = phi i32 [ %.1, %14 ], [ 1, %0 ]
  %.068 = phi i32 [ %18, %14 ], [ 3, %0 ]
  %6 = phi i32 [ %15, %14 ], [ %4, %0 ]
  %7 = and i32 %6, 1
  %.not = icmp eq i32 %7, 0
  br i1 %.not, label %.lr.ph._crit_edge, label %8

.lr.ph._crit_edge:                                ; preds = %.lr.ph
  %.pre = sext i32 %.068 to i64
  br label %14

8:                                                ; preds = %.lr.ph
  %9 = sext i32 %.09 to i64
  %10 = sext i32 %.068 to i64
  %11 = mul nsw i64 %9, %10
  %12 = srem i64 %11, 1000000007
  %13 = trunc nsw i64 %12 to i32
  br label %14

14:                                               ; preds = %.lr.ph._crit_edge, %8
  %.pre-phi = phi i64 [ %.pre, %.lr.ph._crit_edge ], [ %10, %8 ]
  %.1 = phi i32 [ %.09, %.lr.ph._crit_edge ], [ %13, %8 ]
  %15 = lshr i32 %6, 1
  %16 = mul nsw i64 %.pre-phi, %.pre-phi
  %17 = urem i64 %16, 1000000007
  %18 = trunc nuw nsw i64 %17 to i32
  %.not10 = icmp ult i32 %6, 2
  br i1 %.not10, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %14
  store i32 %15, ptr %1, align 4, !tbaa !5
  %19 = sext i32 %.1 to i64
  %20 = mul nsw i64 %19, 500000004
  %21 = add nsw i64 %20, -500000004
  %22 = srem i64 %21, 1000000007
  %23 = trunc nsw i64 %22 to i32
  br label %24

24:                                               ; preds = %._crit_edge, %0
  %.0.lcssa = phi i32 [ %23, %._crit_edge ], [ 0, %0 ]
  %25 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %.0.lcssa)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3
  ret i32 0
}

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

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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" }
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 = !{!"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: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass