; LLVM IR from tangjz/acm-icpc :: 51nod (1717)

; 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 i64, align 8
@m = external dso_local global i64, align 8
@.str = external hidden unnamed_addr constant [5 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
  %2 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  %3 = load i64, ptr @n, align 8, !tbaa !5
  %4 = sitofp i64 %3 to double
  %5 = call double @sqrt(double noundef %4) #4
  %6 = call double @llvm.ceil.f64(double %5)
  %7 = fptosi double %6 to i64
  store i64 %7, ptr @m, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %15, %0
  %9 = load i64, ptr @m, align 8, !tbaa !5
  %10 = load i64, ptr @m, align 8, !tbaa !5
  %11 = mul nsw i64 %9, %10
  %12 = load i64, ptr @n, align 8, !tbaa !5
  %13 = icmp sle i64 %11, %12
  br i1 %13, label %14, label %18

14:                                               ; preds = %8
  br label %15

15:                                               ; preds = %14
  %16 = load i64, ptr @m, align 8, !tbaa !5
  %17 = add nsw i64 %16, 1
  store i64 %17, ptr @m, align 8, !tbaa !5
  br label %8, !llvm.loop !9

18:                                               ; preds = %8
  br label %19

19:                                               ; preds = %26, %18
  %20 = load i64, ptr @m, align 8, !tbaa !5
  %21 = load i64, ptr @m, align 8, !tbaa !5
  %22 = mul nsw i64 %20, %21
  %23 = load i64, ptr @n, align 8, !tbaa !5
  %24 = icmp sgt i64 %22, %23
  br i1 %24, label %25, label %29

25:                                               ; preds = %19
  br label %26

26:                                               ; preds = %25
  %27 = load i64, ptr @m, align 8, !tbaa !5
  %28 = add nsw i64 %27, -1
  store i64 %28, ptr @m, align 8, !tbaa !5
  br label %19, !llvm.loop !11

29:                                               ; preds = %19
  %30 = load i64, ptr @n, align 8, !tbaa !5
  %31 = load i64, ptr @m, align 8, !tbaa !5
  %32 = sub nsw i64 %30, %31
  %33 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i64 noundef %32)
  ret i32 0
}

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

; Function Attrs: nounwind
declare double @sqrt(double noundef) #2

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.ceil.f64(double) #3

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" }
attributes #2 = { 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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !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 i64, align 8
@m = external dso_local local_unnamed_addr global i64, align 8
@.str = external hidden unnamed_addr constant [5 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 = load i64, ptr @n, align 8, !tbaa !5
  %3 = sitofp i64 %2 to double
  %4 = tail call double @sqrt(double noundef %3) #4
  %5 = tail call double @llvm.ceil.f64(double %4)
  %6 = fptosi double %5 to i64
  %7 = load i64, ptr @n, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %8, %0
  %storemerge = phi i64 [ %6, %0 ], [ %10, %8 ]
  %9 = mul nsw i64 %storemerge, %storemerge
  %.not = icmp sgt i64 %9, %7
  %10 = add nsw i64 %storemerge, 1
  br i1 %.not, label %.lr.ph, label %8, !llvm.loop !9

.lr.ph:                                           ; preds = %8, %.lr.ph
  %11 = phi i64 [ %12, %.lr.ph ], [ %storemerge, %8 ]
  %12 = add nsw i64 %11, -1
  %13 = mul nsw i64 %12, %12
  %14 = icmp sgt i64 %13, %7
  br i1 %14, label %.lr.ph, label %15, !llvm.loop !11

15:                                               ; preds = %.lr.ph
  store i64 %12, ptr @m, align 8, !tbaa !5
  %16 = sub nsw i64 %7, %12
  %17 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i64 noundef %16)
  ret i32 0
}

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

; Function Attrs: mustprogress nofree nounwind willreturn memory(write)
declare double @sqrt(double noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.ceil.f64(double) #3

; 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" }
attributes #2 = { mustprogress nofree nounwind willreturn memory(write) "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 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; Effective O3 passes: DSEPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass