mlemanczyk/even-perfect-numbers-scanner
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Refine partial factor primality caching

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Marek Lemańczyk committed 2025-10-19 23:48:07 +02:00
1 parent 0fbd635828
commit 43e2894661
2 files changed
+35 -16
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PerfectNumbers.Core/ThreadStaticPools.cs
+31 -14
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@@ -279,22 +279,39 @@ namespace PerfectNumbers.Core
}
[ThreadStatic]
private static List<Dictionary<ulong, bool>>? _ulongBoolDictionaryPool;
private static Stack<Dictionary<ulong, bool>>? _ulongBoolDictionaryPool;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static Dictionary<ulong, bool> RentUlongBoolDictionary(int capacityHint)
{
List<Dictionary<ulong, bool>>? pool = _ulongBoolDictionaryPool;
if (pool is not null && pool.Count > 0)
Stack<Dictionary<ulong, bool>>? pool = _ulongBoolDictionaryPool;
if (pool is null)
{
int lastIndex = pool.Count - 1;
Dictionary<ulong, bool> dictionary = pool[lastIndex];
pool.RemoveAt(lastIndex);
if (dictionary.Count > 0)
{
dictionary.Clear();
}
pool = new Stack<Dictionary<ulong, bool>>(4);
_ulongBoolDictionaryPool = pool;
}
// Keep the previous null-check implementation here for reference.
// Do not uncomment this branch; the pool is always initialized above.
// if (pool is not null && pool.Count > 0)
// {
// Dictionary<ulong, bool> dictionary = pool.Pop();
// if (dictionary.Count < capacityHint)
// {
// dictionary.EnsureCapacity(capacityHint);
// }
//
// return dictionary;
// }
if (pool.Count > 0)
{
Dictionary<ulong, bool> dictionary = pool.Pop();
// Callers clear dictionaries after renting to avoid duplicate work.
// if (dictionary.Count > 0)
// {
// dictionary.Clear();
// }
if (dictionary.Count < capacityHint)
{
dictionary.EnsureCapacity(capacityHint);
@@ -309,15 +326,15 @@ namespace PerfectNumbers.Core
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void ReturnUlongBoolDictionary(Dictionary<ulong, bool> dictionary)
{
List<Dictionary<ulong, bool>>? pool = _ulongBoolDictionaryPool;
Stack<Dictionary<ulong, bool>>? pool = _ulongBoolDictionaryPool;
if (pool is null)
{
pool = new List<Dictionary<ulong, bool>>(4);
pool = new Stack<Dictionary<ulong, bool>>(4);
_ulongBoolDictionaryPool = pool;
}
dictionary.Clear();
pool.Add(dictionary);
// Do not clear pooled dictionaries here; callers must clear on rent.
pool.Push(dictionary);
}
[ThreadStatic]