; LLVM IR from tangjz/acm-icpc :: lydsy (3043)

; 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
@last = external dso_local global i32, align 4
@now = external dso_local global i32, align 4
@x = external dso_local global i64, align 8
@y = external dso_local global i64, align 8
@.str = external hidden unnamed_addr constant [11 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4scanRi(ptr noundef nonnull align 4 dereferenceable(4)) #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #1 {
  %1 = alloca i32, align 4
  %2 = alloca i64, align 8
  store i32 0, ptr %1, align 4
  call void @_Z4scanRi(ptr noundef nonnull align 4 dereferenceable(4) @n)
  call void @_Z4scanRi(ptr noundef nonnull align 4 dereferenceable(4) @last)
  br label %3

3:                                                ; preds = %7, %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 %5, 0
  br i1 %6, label %7, label %12

7:                                                ; preds = %3
  call void @_Z4scanRi(ptr noundef nonnull align 4 dereferenceable(4) @now)
  %8 = load i32, ptr @now, align 4, !tbaa !5
  %9 = load i32, ptr @last, align 4, !tbaa !5
  %10 = sub nsw i32 %8, %9
  call void @_Z4calci(i32 noundef %10)
  %11 = load i32, ptr @now, align 4, !tbaa !5
  store i32 %11, ptr @last, align 4, !tbaa !5
  br label %3, !llvm.loop !9

12:                                               ; preds = %3
  %13 = load i64, ptr @x, align 8, !tbaa !11
  %14 = load i64, ptr @y, align 8, !tbaa !11
  %15 = icmp slt i64 %13, %14
  br i1 %15, label %16, label %20

16:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #5
  %17 = load i64, ptr @x, align 8, !tbaa !11
  store i64 %17, ptr %2, align 8, !tbaa !11
  %18 = load i64, ptr @y, align 8, !tbaa !11
  store i64 %18, ptr @x, align 8, !tbaa !11
  %19 = load i64, ptr %2, align 8, !tbaa !11
  store i64 %19, ptr @y, align 8, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #5
  br label %20

20:                                               ; preds = %16, %12
  %21 = load i64, ptr @x, align 8, !tbaa !11
  %22 = load i64, ptr @x, align 8, !tbaa !11
  %23 = load i64, ptr @y, align 8, !tbaa !11
  %24 = sub nsw i64 %22, %23
  %25 = add nsw i64 %24, 1
  %26 = call i32 (ptr, ...) @printf(ptr noundef @.str, i64 noundef %21, i64 noundef %25)
  ret i32 0
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_Z4calci(i32 noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #3

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #3

declare i32 @printf(ptr noundef, ...) #4

attributes #0 = { mustprogress 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 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 #2 = { inlinehint mustprogress 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 #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { "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 #5 = { 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"}
!11 = !{!12, !12, i64 0}
!12 = !{!"long long", !7, i64 0}


; 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
@last = external dso_local global i32, align 4
@now = external dso_local global i32, align 4
@x = external dso_local local_unnamed_addr global i64, align 8
@y = external dso_local local_unnamed_addr global i64, align 8
@.str = external hidden unnamed_addr constant [11 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4scanRi(ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  tail call void @_Z4scanRi(ptr noundef nonnull align 4 dereferenceable(4) @n)
  tail call void @_Z4scanRi(ptr noundef nonnull align 4 dereferenceable(4) @last)
  %1 = load i32, ptr @n, align 4, !tbaa !5
  %2 = add nsw i32 %1, -1
  store i32 %2, ptr @n, align 4, !tbaa !5
  %.not2 = icmp eq i32 %2, 0
  br i1 %.not2, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  tail call void @_Z4scanRi(ptr noundef nonnull align 4 dereferenceable(4) @now)
  %3 = load i32, ptr @now, align 4, !tbaa !5
  %4 = load i32, ptr @last, align 4, !tbaa !5
  %5 = sub nsw i32 %3, %4
  tail call void @_Z4calci(i32 noundef %5)
  %6 = load i32, ptr @now, align 4, !tbaa !5
  store i32 %6, ptr @last, align 4, !tbaa !5
  %7 = load i32, ptr @n, align 4, !tbaa !5
  %8 = add nsw i32 %7, -1
  store i32 %8, ptr @n, align 4, !tbaa !5
  %.not = icmp eq i32 %8, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %0
  %9 = load i64, ptr @x, align 8, !tbaa !11
  %10 = load i64, ptr @y, align 8, !tbaa !11
  %11 = icmp slt i64 %9, %10
  br i1 %11, label %12, label %13

12:                                               ; preds = %._crit_edge
  store i64 %10, ptr @x, align 8, !tbaa !11
  store i64 %9, ptr @y, align 8, !tbaa !11
  br label %13

13:                                               ; preds = %12, %._crit_edge
  %14 = phi i64 [ %9, %12 ], [ %10, %._crit_edge ]
  %15 = phi i64 [ %10, %12 ], [ %9, %._crit_edge ]
  %16 = add i64 %15, 1
  %17 = sub i64 %16, %14
  %18 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i64 noundef %15, i64 noundef %17)
  ret i32 0
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_Z4calci(i32 noundef) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

attributes #0 = { mustprogress 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 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 #2 = { inlinehint mustprogress 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 #3 = { 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"}
!11 = !{!12, !12, i64 0}
!12 = !{!"long long", !7, i64 0}


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