; LLVM IR from tangjz/acm-icpc :: 51nod (1049)

; 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
@x = external dso_local global i32, align 4
@now = external dso_local global i64, align 8
@ans = external dso_local global i64, align 8
@.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
  %2 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  br label %3

3:                                                ; preds = %22, %0
  %4 = load i32, ptr @n, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr @n, align 4, !tbaa !5
  %6 = icmp ne i32 %4, 0
  br i1 %6, label %7, label %23

7:                                                ; preds = %3
  %8 = load i64, ptr @now, align 8, !tbaa !9
  %9 = icmp slt i64 %8, 0
  br i1 %9, label %10, label %11

10:                                               ; preds = %7
  store i64 0, ptr @now, align 8, !tbaa !9
  br label %11

11:                                               ; preds = %10, %7
  %12 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @x)
  %13 = load i32, ptr @x, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = load i64, ptr @now, align 8, !tbaa !9
  %16 = add nsw i64 %15, %14
  store i64 %16, ptr @now, align 8, !tbaa !9
  %17 = load i64, ptr @ans, align 8, !tbaa !9
  %18 = load i64, ptr @now, align 8, !tbaa !9
  %19 = icmp slt i64 %17, %18
  br i1 %19, label %20, label %22

20:                                               ; preds = %11
  %21 = load i64, ptr @now, align 8, !tbaa !9
  store i64 %21, ptr @ans, align 8, !tbaa !9
  br label %22

22:                                               ; preds = %20, %11
  br label %3, !llvm.loop !11

23:                                               ; preds = %3
  %24 = load i64, ptr @ans, align 8, !tbaa !9
  %25 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i64 noundef %24)
  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 = !{!10, !10, i64 0}
!10 = !{!"long long", !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"

@n = external dso_local global i32, align 4
@x = external dso_local global i32, align 4
@now = external dso_local local_unnamed_addr global i64, align 8
@ans = external dso_local local_unnamed_addr global i64, align 8
@.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 = load i32, ptr @n, align 4, !tbaa !5
  %3 = add nsw i32 %2, -1
  store i32 %3, ptr @n, align 4, !tbaa !5
  %.not1 = icmp eq i32 %2, 0
  br i1 %.not1, label %.._crit_edge_crit_edge, label %.lr.ph.preheader

.._crit_edge_crit_edge:                           ; preds = %0
  %.pre2 = load i64, ptr @ans, align 8, !tbaa !9
  br label %._crit_edge

.lr.ph.preheader:                                 ; preds = %0
  %.pre = load i64, ptr @now, align 8, !tbaa !9
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %16
  %4 = phi i64 [ %.pre, %.lr.ph.preheader ], [ %12, %16 ]
  %5 = icmp slt i64 %4, 0
  br i1 %5, label %6, label %7

6:                                                ; preds = %.lr.ph
  store i64 0, ptr @now, align 8, !tbaa !9
  br label %7

7:                                                ; preds = %6, %.lr.ph
  %8 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @x)
  %9 = load i32, ptr @x, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = load i64, ptr @now, align 8, !tbaa !9
  %12 = add nsw i64 %11, %10
  store i64 %12, ptr @now, align 8, !tbaa !9
  %13 = load i64, ptr @ans, align 8, !tbaa !9
  %14 = icmp slt i64 %13, %12
  br i1 %14, label %15, label %16

15:                                               ; preds = %7
  store i64 %12, ptr @ans, align 8, !tbaa !9
  br label %16

16:                                               ; preds = %15, %7
  %17 = phi i64 [ %12, %15 ], [ %13, %7 ]
  %18 = load i32, ptr @n, align 4, !tbaa !5
  %19 = add nsw i32 %18, -1
  store i32 %19, ptr @n, align 4, !tbaa !5
  %.not = icmp eq i32 %18, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %16, %.._crit_edge_crit_edge
  %20 = phi i64 [ %.pre2, %.._crit_edge_crit_edge ], [ %17, %16 ]
  %21 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i64 noundef %20)
  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 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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