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Retire 'symmetric'

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And make explicit that WDLEntry and the corresponding
DTZEntry have the same principal key.
This commit is contained in:
Marco Costalba 2016-05-10 18:43:17 +02:00
parent 72bb4695d1
commit b13dd6c333
1 changed files with 18 additions and 33 deletions
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45
src/syzygy/tbprobe.cpp
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@ -89,8 +89,8 @@ struct WDLEntry : public Atomic {
void* baseAddress;
uint64_t mapping;
Key key;
Key key2;
int pieceCount;
bool symmetric;
bool hasPawns;
union {
struct {
@ -115,7 +115,7 @@ struct DTZEntry {
enum Flag { STM = 1, Mapped = 2, WinPlies = 4, LossPlies = 8 };
DTZEntry(const WDLEntry& wdl, Key wdlKeys[]);
DTZEntry(const WDLEntry& wdl);
~DTZEntry();
bool init(const std::string& fname);
template<typename T> void do_init(T& e, uint8_t* data);
@ -125,7 +125,6 @@ struct DTZEntry {
Key key;
Key key2;
int pieceCount;
bool symmetric;
bool hasPawns;
union {
struct {
@ -358,8 +357,8 @@ WDLEntry::WDLEntry(const Position& pos, Key keys[])
memset(this, 0, sizeof(WDLEntry));
key = keys[WHITE];
key2 = keys[BLACK];
pieceCount = pos.count<ALL_PIECES>(WHITE) + pos.count<ALL_PIECES>(BLACK);
symmetric = (keys[WHITE] == keys[BLACK]);
hasPawns = pos.pieces(PAWN);
if (hasPawns) {
@ -391,17 +390,13 @@ WDLEntry::~WDLEntry()
delete piece[i].precomp;
}
DTZEntry::DTZEntry(const WDLEntry& wdl, Key wdlKeys[])
DTZEntry::DTZEntry(const WDLEntry& wdl)
{
memset(this, 0, sizeof(DTZEntry));
key = wdlKeys[0];
key2 = wdlKeys[1];
assert(key == wdl.key);
key = wdl.key;
key2 = wdl.key2;
pieceCount = wdl.pieceCount;
symmetric = wdl.symmetric;
hasPawns = wdl.hasPawns;
if (hasPawns) {
@ -425,7 +420,7 @@ DTZEntry::~DTZEntry()
// Given a position return a string of the form KQPvKRP, where KQP represents
// the white pieces if mirror == false and the black pieces if mirror == true.
std::string str_code(const Position& pos, bool mirror = false)
std::string pos_code(const Position& pos, bool mirror = false)
{
std::string w, b;
@ -446,7 +441,7 @@ void HashTable::insert(const std::vector<PieceType>& pieces)
for (PieceType pt : pieces)
code += PieceToChar[pt];
TBFile file(str_code(pos.set(code, WHITE, &st)) + ".rtbw");
TBFile file(pos_code(pos.set(code, WHITE, &st)) + ".rtbw");
if (!file.is_open())
return;
@ -543,7 +538,7 @@ bool check_dtz_stm(DTZEntry* entry, File f, int stm) {
: entry->piece.flags;
return (flags & DTZEntry::Flag::STM) == stm
|| (entry->symmetric && !entry->hasPawns);
|| ((entry->key == entry->key2) && !entry->hasPawns);
}
// DTZ scores are sorted by frequency of occurrence and then assigned the
@ -601,7 +596,7 @@ uint64_t probe_table(const Position& pos, Entry* entry, WDLScore wdl = WDLDraw,
// keys are equal. The stored TB entry is calculated always with WHITE side
// to move and if the position to lookup has instead BLACK to move, we need
// to switch color and flip the squares before the lookup:
if (entry->symmetric) {
if (entry->key == entry->key2) {
flipColor = pos.side_to_move() * 8; // Switch color
flipSquares = pos.side_to_move() * 070; // Vertical flip: SQ_A8 -> SQ_A1
stm = WHITE;
@ -948,7 +943,7 @@ void WDLEntry::do_init(T& e, uint8_t* data)
File maxFile = (flags & HasPawns) ? FILE_D : FILE_A;
assert(hasPawns == !!(flags & HasPawns));
assert(symmetric != !!(flags & Split));
assert((key != key2) == !!(flags & Split));
bool pp = (flags & HasPawns) && pawn.pawnCount[1]; // Pawns on both sides
@ -1025,7 +1020,7 @@ void DTZEntry::do_init(T& e, uint8_t* data)
File maxFile = (flags & HasPawns) ? FILE_D : FILE_A;
assert(hasPawns == !!(flags & HasPawns));
assert(symmetric != !!(flags & Split));
assert((key != key2) == !!(flags & Split));
bool pp = (flags & HasPawns) && pawn.pawnCount[1]; // Pawns on both sides
@ -1115,7 +1110,7 @@ WDLScore probe_wdl_table(Position& pos, int* success)
if (!entry->ready.load(std::memory_order_acquire)) {
std::unique_lock<Mutex> lk(TB_mutex);
if (!entry->ready.load(std::memory_order_relaxed)) {
std::string fname = str_code(pos, entry->key != key) + ".rtbw";
std::string fname = pos_code(pos, entry->key != key) + ".rtbw";
if (!entry->init(fname)) {
// Was ptr2->key = 0ULL; Just leave !ptr->ready condition
*success = 0;
@ -1125,8 +1120,6 @@ WDLScore probe_wdl_table(Position& pos, int* success)
}
}
assert(key == entry->key || !entry->symmetric);
return (WDLScore)probe_table(pos, entry);
}
@ -1153,17 +1146,9 @@ int probe_dtz_table(const Position& pos, WDLScore wdl, int *success)
return 0;
}
StateInfo st;
Position p;
std::string wdlCode = str_code(pos, wdlEntry->key != key);
std::string fname = wdlCode + ".rtbz";
wdlCode.erase(wdlCode.find('v'), 1);
Key wdlKeys[] = { p.set(wdlCode, WHITE, &st).material_key(),
p.set(wdlCode, BLACK, &st).material_key() };
DTZTable.push_front(DTZEntry(*wdlEntry, wdlKeys));
DTZTable.push_front(DTZEntry(*wdlEntry));
std::string fname = pos_code(pos, wdlEntry->key != key) + ".rtbz";
if (!DTZTable.front().init(fname)) {
// In case file is not found init() fails, but we leave
// the entry so to avoid rechecking at every probe (same