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Small cleanups

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closes https://github.com/official-stockfish/Stockfish/pull/2628

No functional change
This commit is contained in:
Joost VandeVondele
2020-04-29 17:39:25 +02:00
parent 4776dc0e12
commit 353e20674b
6 changed files with 17 additions and 15 deletions
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14
src/search.cpp
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@@ -61,8 +61,8 @@ namespace {
// Different node types, used as a template parameter
enum NodeType { NonPV, PV };
constexpr uint64_t ttHitAverageWindow = 4096;
constexpr uint64_t ttHitAverageResolution = 1024;
constexpr uint64_t TtHitAverageWindow = 4096;
constexpr uint64_t TtHitAverageResolution = 1024;
// Razor and futility margins
constexpr int RazorMargin = 531;
@@ -378,7 +378,7 @@ void Thread::search() {
multiPV = std::max(multiPV, (size_t)4);
multiPV = std::min(multiPV, rootMoves.size());
ttHitAverage = ttHitAverageWindow * ttHitAverageResolution / 2;
ttHitAverage = TtHitAverageWindow * TtHitAverageResolution / 2;
int ct = int(Options["Contempt"]) * PawnValueEg / 100; // From centipawns
@@ -702,8 +702,8 @@ namespace {
thisThread->lowPlyHistory[ss->ply - 1][from_to((ss-1)->currentMove)] << stat_bonus(depth - 5);
// thisThread->ttHitAverage can be used to approximate the running average of ttHit
thisThread->ttHitAverage = (ttHitAverageWindow - 1) * thisThread->ttHitAverage / ttHitAverageWindow
+ ttHitAverageResolution * ttHit;
thisThread->ttHitAverage = (TtHitAverageWindow - 1) * thisThread->ttHitAverage / TtHitAverageWindow
+ TtHitAverageResolution * ttHit;
// At non-PV nodes we check for an early TT cutoff
if ( !PvNode
@@ -1170,12 +1170,12 @@ moves_loop: // When in check, search starts from here
|| moveCountPruning
|| ss->staticEval + PieceValue[EG][pos.captured_piece()] <= alpha
|| cutNode
|| thisThread->ttHitAverage < 375 * ttHitAverageResolution * ttHitAverageWindow / 1024))
|| thisThread->ttHitAverage < 375 * TtHitAverageResolution * TtHitAverageWindow / 1024))
{
Depth r = reduction(improving, depth, moveCount);
// Decrease reduction if the ttHit running average is large
if (thisThread->ttHitAverage > 500 * ttHitAverageResolution * ttHitAverageWindow / 1024)
if (thisThread->ttHitAverage > 500 * TtHitAverageResolution * TtHitAverageWindow / 1024)
r--;
// Reduction if other threads are searching this position.