; LLVM IR from tangjz/acm-icpc :: lydsy (1257)

; 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
@k = external dso_local global i64, align 8
@ans = external dso_local global i64, align 8
@.str = external hidden unnamed_addr constant [9 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
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  store i32 0, ptr %1, align 4
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n, ptr noundef @k)
  %5 = load i64, ptr @n, align 8, !tbaa !5
  %6 = load i64, ptr @k, align 8, !tbaa !5
  %7 = mul nsw i64 %5, %6
  store i64 %7, ptr @ans, align 8, !tbaa !5
  %8 = load i64, ptr @n, align 8, !tbaa !5
  %9 = load i64, ptr @k, align 8, !tbaa !5
  %10 = icmp sgt i64 %8, %9
  br i1 %10, label %11, label %13

11:                                               ; preds = %0
  %12 = load i64, ptr @k, align 8, !tbaa !5
  store i64 %12, ptr @n, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %11, %0
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  store i64 1, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  br label %14

14:                                               ; preds = %46, %13
  %15 = load i64, ptr %2, align 8, !tbaa !5
  %16 = load i64, ptr @n, align 8, !tbaa !5
  %17 = icmp sle i64 %15, %16
  br i1 %17, label %19, label %18

18:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  br label %49

19:                                               ; preds = %14
  %20 = load i64, ptr @k, align 8, !tbaa !5
  %21 = load i64, ptr @k, align 8, !tbaa !5
  %22 = load i64, ptr %2, align 8, !tbaa !5
  %23 = sdiv i64 %21, %22
  %24 = sdiv i64 %20, %23
  store i64 %24, ptr %3, align 8, !tbaa !5
  %25 = load i64, ptr %3, align 8, !tbaa !5
  %26 = load i64, ptr @n, align 8, !tbaa !5
  %27 = icmp sgt i64 %25, %26
  br i1 %27, label %28, label %30

28:                                               ; preds = %19
  %29 = load i64, ptr @n, align 8, !tbaa !5
  store i64 %29, ptr %3, align 8, !tbaa !5
  br label %30

30:                                               ; preds = %28, %19
  %31 = load i64, ptr @k, align 8, !tbaa !5
  %32 = load i64, ptr %2, align 8, !tbaa !5
  %33 = sdiv i64 %31, %32
  %34 = load i64, ptr %2, align 8, !tbaa !5
  %35 = load i64, ptr %3, align 8, !tbaa !5
  %36 = add nsw i64 %34, %35
  %37 = mul nsw i64 %33, %36
  %38 = load i64, ptr %3, align 8, !tbaa !5
  %39 = load i64, ptr %2, align 8, !tbaa !5
  %40 = sub nsw i64 %38, %39
  %41 = add nsw i64 %40, 1
  %42 = mul nsw i64 %37, %41
  %43 = sdiv i64 %42, 2
  %44 = load i64, ptr @ans, align 8, !tbaa !5
  %45 = sub nsw i64 %44, %43
  store i64 %45, ptr @ans, align 8, !tbaa !5
  br label %46

46:                                               ; preds = %30
  %47 = load i64, ptr %3, align 8, !tbaa !5
  %48 = add nsw i64 %47, 1
  store i64 %48, ptr %2, align 8, !tbaa !5
  br label %14, !llvm.loop !9

49:                                               ; preds = %18
  %50 = load i64, ptr @ans, align 8, !tbaa !5
  %51 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i64 noundef %50)
  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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"long long", !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 i64, align 8
@k = external dso_local global i64, align 8
@ans = external dso_local local_unnamed_addr global i64, align 8
@.str = external hidden unnamed_addr constant [9 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, ptr noundef nonnull @k)
  %2 = load i64, ptr @n, align 8, !tbaa !5
  %3 = load i64, ptr @k, align 8, !tbaa !5
  %4 = mul nsw i64 %3, %2
  store i64 %4, ptr @ans, align 8, !tbaa !5
  %5 = icmp sgt i64 %2, %3
  br i1 %5, label %6, label %7

6:                                                ; preds = %0
  store i64 %3, ptr @n, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %6, %0
  %8 = phi i64 [ %3, %6 ], [ %2, %0 ]
  %.not13 = icmp slt i64 %8, 1
  br i1 %.not13, label %9, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph
  store i64 %19, ptr @ans, align 8, !tbaa !5
  br label %9

9:                                                ; preds = %._crit_edge, %7
  %10 = phi i64 [ %19, %._crit_edge ], [ %4, %7 ]
  %11 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i64 noundef %10)
  ret i32 0

.lr.ph:                                           ; preds = %7, %.lr.ph
  %.0914 = phi i64 [ %20, %.lr.ph ], [ 1, %7 ]
  %12 = phi i64 [ %19, %.lr.ph ], [ %4, %7 ]
  %13 = sdiv i64 %3, %.0914
  %14 = sdiv i64 %3, %13
  %spec.select = tail call i64 @llvm.smin.i64(i64 %14, i64 %8)
  %15 = add nsw i64 %spec.select, %.0914
  %16 = mul nsw i64 %15, %13
  %reass.sub = sub i64 %spec.select, %.0914
  %17 = add i64 %reass.sub, 1
  %18 = mul nsw i64 %16, %17
  %.neg = sdiv i64 %18, -2
  %19 = add i64 %.neg, %12
  %20 = add nsw i64 %spec.select, 1
  %.not.not = icmp slt i64 %14, %8
  br i1 %.not.not, label %.lr.ph, label %._crit_edge, !llvm.loop !9
}

; 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

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.smin.i64(i64, i64) #2

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 = { 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 = !{!"long long", !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,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass