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Fix potential TT indexing issue #221

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merged 4 commits into from
Aug 12, 2023
Merged

Fix potential TT indexing issue #221

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f2770f9
Bench: 5622343
PGG106 Aug 12, 2023
f2f34df
Bench: 14205696
PGG106 Aug 12, 2023
fa3a114
Bench: 14205696
PGG106 Aug 12, 2023
6c0ad7b
update version string
PGG106 Aug 12, 2023
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6 changes: 5 additions & 1 deletion src/ttable.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,11 @@ void StoreHashEntry(const ZobristKey key, const int16_t move, int score, int16_t
}

uint64_t Index(const ZobristKey posKey) {
return (static_cast<uint32_t>(posKey) * static_cast<uint64_t>(HashTable->pTable.size())) >> 32;
#ifdef __SIZEOF_INT128__
return static_cast<uint64_t>(((static_cast<__uint128_t>(posKey) * static_cast<__uint128_t>(HashTable->pTable.size())) >> 64));
#else
return posKey % HashTable->pTable.size();
#endif
}

// prefetches the data in the given address in l1/2 cache in a non blocking way.
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2 changes: 1 addition & 1 deletion src/types.h
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Expand Up @@ -2,7 +2,7 @@

#include <cstdint>

#define NAME "Alexandria-4.0.11"
#define NAME "Alexandria-4.0.12"

// define bitboard data type
using Bitboard = uint64_t;
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