; LLVM IR from eyangch/competitive-programming :: USACOtraining/2.1/castle.ll (Z9rstvisitsii)

; 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.std::array.2" = type { [50 x %"struct.std::array.3"] }
%"struct.std::array.3" = type { [50 x i8] }

@visited = external dso_local global %"struct.std::array.2", align 1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 1 dereferenceable(50) ptr @_ZNSt5arrayIS_IbLm50EELm50EEixEm(ptr noundef nonnull align 1 dereferenceable(2500), i64 noundef) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt5arrayIbLm50EEixEm(ptr noundef nonnull align 1 dereferenceable(50), i64 noundef) #0 align 2

; 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 nounwind uwtable
define dso_local void @_Z9rstvisitsii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %30, %2
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = icmp slt i32 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %8
  store i32 2, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %33

13:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %14

14:                                               ; preds = %26, %13
  %15 = load i32, ptr %7, align 4, !tbaa !5
  %16 = load i32, ptr %4, align 4, !tbaa !5
  %17 = icmp slt i32 %15, %16
  br i1 %17, label %19, label %18

18:                                               ; preds = %14
  store i32 5, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %29

19:                                               ; preds = %14
  %20 = load i32, ptr %5, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = call noundef nonnull align 1 dereferenceable(50) ptr @_ZNSt5arrayIS_IbLm50EELm50EEixEm(ptr noundef nonnull align 1 dereferenceable(2500) @visited, i64 noundef %21) #2
  %23 = load i32, ptr %7, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt5arrayIbLm50EEixEm(ptr noundef nonnull align 1 dereferenceable(50) %22, i64 noundef %24) #2
  store i8 0, ptr %25, align 1, !tbaa !9
  br label %26

26:                                               ; preds = %19
  %27 = load i32, ptr %7, align 4, !tbaa !5
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %7, align 4, !tbaa !5
  br label %14, !llvm.loop !11

29:                                               ; preds = %18
  br label %30

30:                                               ; preds = %29
  %31 = load i32, ptr %5, align 4, !tbaa !5
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %5, align 4, !tbaa !5
  br label %8, !llvm.loop !13

33:                                               ; preds = %12
  ret void
}

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 = !{!"bool", !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.std::array.2" = type { [50 x %"struct.std::array.3"] }
%"struct.std::array.3" = type { [50 x i8] }

@visited = external dso_local global %"struct.std::array.2", align 1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 1 dereferenceable(50) ptr @_ZNSt5arrayIS_IbLm50EELm50EEixEm(ptr noundef nonnull align 1 dereferenceable(2500), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt5arrayIbLm50EEixEm(ptr noundef nonnull align 1 dereferenceable(50), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z9rstvisitsii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp sgt i32 %0, 0
  %4 = icmp sgt i32 %1, 0
  %or.cond = and i1 %3, %4
  br i1 %or.cond, label %.preheader.us.preheader, label %._crit_edge11

.preheader.us.preheader:                          ; preds = %2
  %wide.trip.count17 = zext nneg i32 %0 to i64
  %wide.trip.count = zext nneg i32 %1 to i64
  br label %.preheader.us

.preheader.us:                                    ; preds = %.preheader.us.preheader, %._crit_edge.us
  %indvars.iv14 = phi i64 [ 0, %.preheader.us.preheader ], [ %indvars.iv.next15, %._crit_edge.us ]
  br label %5

5:                                                ; preds = %.preheader.us, %5
  %indvars.iv = phi i64 [ 0, %.preheader.us ], [ %indvars.iv.next, %5 ]
  %6 = tail call noundef nonnull align 1 dereferenceable(50) ptr @_ZNSt5arrayIS_IbLm50EELm50EEixEm(ptr noundef nonnull align 1 dereferenceable(2500) @visited, i64 noundef %indvars.iv14) #1
  %7 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt5arrayIbLm50EEixEm(ptr noundef nonnull align 1 dereferenceable(50) %6, i64 noundef %indvars.iv) #1
  store i8 0, ptr %7, align 1, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge.us, label %5, !llvm.loop !9

._crit_edge.us:                                   ; preds = %5
  %indvars.iv.next15 = add nuw nsw i64 %indvars.iv14, 1
  %exitcond18.not = icmp eq i64 %indvars.iv.next15, %wide.trip.count17
  br i1 %exitcond18.not, label %._crit_edge11, label %.preheader.us, !llvm.loop !11

._crit_edge11:                                    ; preds = %._crit_edge.us, %2
  ret void
}

attributes #0 = { 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 #1 = { 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 = !{!"bool", !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: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass