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Better code for hash table generation

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This patch removes some magic numbers in TT bit management and introduce proper
constants in the code, to improve documentation and ease further modifications.

No function change
This commit is contained in:
mattginsberg
2021-02-11 22:29:28 +01:00
committed by Stéphane Nicolet
parent 550fed3343
commit 573f0e364f
3 changed files with 16 additions and 8 deletions
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8
src/tt.h
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@@ -72,9 +72,15 @@ class TranspositionTable {
static_assert(sizeof(Cluster) == 32, "Unexpected Cluster size");
// Constants used to refresh the hash table periodically
static constexpr unsigned GENERATION_BITS = 3; // nb of bits reserved for other things
static constexpr int GENERATION_DELTA = (1 << GENERATION_BITS); // increment for generation field
static constexpr int GENERATION_CYCLE = 255 + (1 << GENERATION_BITS); // cycle length
static constexpr int GENERATION_MASK = (0xFF << GENERATION_BITS) & 0xFF; // mask to pull out generation number
public:
~TranspositionTable() { aligned_large_pages_free(table); }
void new_search() { generation8 += 8; } // Lower 3 bits are used by PV flag and Bound
void new_search() { generation8 += GENERATION_DELTA; } // Lower bits are used for other things
TTEntry* probe(const Key key, bool& found) const;
int hashfull() const;
void resize(size_t mbSize);