; LLVM IR from tangjz/acm-icpc :: hdu (3868)

; 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"

%struct.Point = type { i32, i32 }

@t = external dso_local global i32, align 4
@n = external dso_local global i32, align 4
@ans = external dso_local global double, align 8
@p = external dso_local global [20001 x %struct.Point], align 16
@.str = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5solveii(i32 noundef, i32 noundef) #0

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

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

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @_Z4scanIiEvRT_(ptr noundef nonnull align 4 dereferenceable(4) @t)
  br label %3

3:                                                ; preds = %25, %0
  %4 = load i32, ptr @t, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr @t, align 4, !tbaa !5
  %6 = icmp ne i32 %4, 0
  br i1 %6, label %7, label %33

7:                                                ; preds = %3
  store double 1.000000e+10, ptr @ans, align 8, !tbaa !9
  call void @_Z4scanIiEvRT_(ptr noundef nonnull align 4 dereferenceable(4) @n)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %22, %7
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = load i32, ptr @n, align 4, !tbaa !5
  %11 = icmp slt i32 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  br label %25

13:                                               ; preds = %8
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [20001 x %struct.Point], ptr @p, i64 0, i64 %15
  %17 = getelementptr inbounds %struct.Point, ptr %16, i32 0, i32 0
  call void @_Z4scanIiEvRT_(ptr noundef nonnull align 4 dereferenceable(4) %17)
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [20001 x %struct.Point], ptr @p, i64 0, i64 %19
  %21 = getelementptr inbounds %struct.Point, ptr %20, i32 0, i32 1
  call void @_Z4scanIiEvRT_(ptr noundef nonnull align 4 dereferenceable(4) %21)
  br label %22

22:                                               ; preds = %13
  %23 = load i32, ptr %2, align 4, !tbaa !5
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr %2, align 4, !tbaa !5
  br label %8, !llvm.loop !11

25:                                               ; preds = %12
  %26 = load i32, ptr @n, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds %struct.Point, ptr @p, i64 %27
  call void @_ZSt4sortIP5PointEvT_S2_(ptr noundef @p, ptr noundef %28)
  %29 = load i32, ptr @n, align 4, !tbaa !5
  %30 = sub nsw i32 %29, 1
  call void @_Z5solveii(i32 noundef 0, i32 noundef %30)
  %31 = load double, ptr @ans, align 8, !tbaa !9
  %32 = call i32 (ptr, ...) @printf(ptr noundef @.str, double noundef %31)
  br label %3, !llvm.loop !13

33:                                               ; preds = %3
  ret i32 0
}

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4scanIiEvRT_(ptr noundef nonnull align 4 dereferenceable(4)) #0

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIP5PointEvT_S2_(ptr noundef, ptr noundef) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #3 = { inlinehint 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 #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 = !{!10, !10, i64 0}
!10 = !{!"double", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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"

%struct.Point = type { i32, i32 }

@t = external dso_local global i32, align 4
@n = external dso_local global i32, align 4
@ans = external dso_local local_unnamed_addr global double, align 8
@p = external dso_local global [20001 x %struct.Point], align 16
@.str = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5solveii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  tail call void @_Z4scanIiEvRT_(ptr noundef nonnull align 4 dereferenceable(4) @t)
  %1 = load i32, ptr @t, align 4, !tbaa !5
  %2 = add nsw i32 %1, -1
  store i32 %2, ptr @t, align 4, !tbaa !5
  %.not6 = icmp eq i32 %1, 0
  br i1 %.not6, label %._crit_edge9, label %.lr.ph8

.lr.ph8:                                          ; preds = %0, %._crit_edge
  store double 1.000000e+10, ptr @ans, align 8, !tbaa !9
  tail call void @_Z4scanIiEvRT_(ptr noundef nonnull align 4 dereferenceable(4) @n)
  %3 = load i32, ptr @n, align 4, !tbaa !5
  %4 = icmp sgt i32 %3, 0
  br i1 %4, label %.lr.ph, label %.lr.ph8.._crit_edge_crit_edge

.lr.ph8.._crit_edge_crit_edge:                    ; preds = %.lr.ph8
  %.pre = sext i32 %3 to i64
  br label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %.lr.ph8.._crit_edge_crit_edge
  %.pre-phi = phi i64 [ %.pre, %.lr.ph8.._crit_edge_crit_edge ], [ %15, %.lr.ph ]
  %5 = getelementptr inbounds %struct.Point, ptr @p, i64 %.pre-phi
  tail call void @_ZSt4sortIP5PointEvT_S2_(ptr noundef nonnull @p, ptr noundef nonnull %5)
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %7 = add nsw i32 %6, -1
  tail call void @_Z5solveii(i32 noundef 0, i32 noundef %7)
  %8 = load double, ptr @ans, align 8, !tbaa !9
  %9 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, double noundef %8)
  %10 = load i32, ptr @t, align 4, !tbaa !5
  %11 = add nsw i32 %10, -1
  store i32 %11, ptr @t, align 4, !tbaa !5
  %.not = icmp eq i32 %10, 0
  br i1 %.not, label %._crit_edge9, label %.lr.ph8, !llvm.loop !11

.lr.ph:                                           ; preds = %.lr.ph8, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %.lr.ph8 ]
  %12 = getelementptr inbounds [20001 x %struct.Point], ptr @p, i64 0, i64 %indvars.iv
  tail call void @_Z4scanIiEvRT_(ptr noundef nonnull align 4 dereferenceable(4) %12)
  %13 = getelementptr inbounds i8, ptr %12, i64 4
  tail call void @_Z4scanIiEvRT_(ptr noundef nonnull align 4 dereferenceable(4) %13)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %14 = load i32, ptr @n, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = icmp slt i64 %indvars.iv.next, %15
  br i1 %16, label %.lr.ph, label %._crit_edge, !llvm.loop !13

._crit_edge9:                                     ; preds = %._crit_edge, %0
  ret i32 0
}

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4scanIiEvRT_(ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIP5PointEvT_S2_(ptr noundef, ptr 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 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 = !{!10, !10, i64 0}
!10 = !{!"double", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


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