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Performance improvements

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This commit is contained in:
Ole Morud
2026-01-07 15:15:18 +01:00
parent 716527fa8f
commit 5a5a392c8b
12 changed files with 385 additions and 219 deletions
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29
engine-tt.h
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@@ -1,28 +1,27 @@
#pragma once
struct search_option {
/* TODO: optimize order of fields and size */
double score;
struct move move;
uint64_t hash;
uint8_t init : 1;
enum tt_flag {TT_EXACT, TT_LOWER, TT_UPPER} flag : 3;
int8_t depth : 4;
uint64_t hash; // + 64 (64 / 8)
float score; // + 32 (96 / 12)
struct move move; // + 32 (128 / 16)
int depth : 4; // + 4 (132 / 17)
int init : 1; // + 1 (133 / 17)
enum tt_flag {TT_EXACT, TT_LOWER, TT_UPPER} flag : 3; // +3 (136 / 17)
};
#define TT_ADDRESS_BITS 24
#define TT_ENTRIES (1ULL<<TT_ADDRESS_BITS)
#define TT_MASK (TT_ENTRIES-1)
struct tt {
struct search_option* entries/*[TT_ENTRIES]*/; /* must be initialized somewhere */
size_t mask;
#ifndef NDEBUG
/* stats */
uint64_t collisions;
uint64_t hits;
uint64_t probes;
uint64_t overwritten;
uint64_t insertions;
#endif
};
struct zobrist {
@@ -92,10 +91,10 @@ static inline uint64_t tt_hash_switch_side(uint64_t hash)
static inline struct search_option tt_get(struct tt* tt, uint64_t hash)
{
uint64_t const addr = hash % TT_ENTRIES;
uint64_t const addr = hash & tt->mask;
struct search_option tte = tt->entries[addr];
#ifndef NDEBUG
#ifndef NSTATS
tt->probes += 1;
if (tte.init && tte.hash == hash) {
tt->hits += 1;
@@ -108,10 +107,10 @@ static inline struct search_option tt_get(struct tt* tt, uint64_t hash)
static inline void tt_insert(struct tt* tt, uint64_t hash, struct search_option so)
{
uint64_t const addr = hash % TT_ENTRIES;
uint64_t const addr = hash & tt->mask;
so.init = true;
tt->entries[addr] = so;
#ifndef NDEBUG
#ifndef NSTATS
tt->insertions += 1;
#endif
}
@@ -123,7 +122,7 @@ static inline void tt_insert(struct tt* tt, uint64_t hash, struct search_option
*/
static inline void tt_insert_maybe(struct tt* tt, uint64_t hash, struct search_option so)
{
uint64_t const addr = hash % TT_ENTRIES;
uint64_t const addr = hash & tt->mask;
#if 0
struct search_option* tte = &tt->entries[addr];
@@ -134,7 +133,7 @@ static inline void tt_insert_maybe(struct tt* tt, uint64_t hash, struct search_o
so.init = true;
tt->entries[addr] = so;
#ifndef NDEBUG
#ifndef NSTATS
tt->insertions += 1;
#endif
}