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Code Issues Releases Wiki Activity

Templatize qsearch

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No functional change and 2% speed-up on GCC.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2010-05-08 16:59:00 +03:00 • committed by Marco Costalba
parent e0e4bdc991
commit c20a41c9cf
1 changed files with 15 additions and 11 deletions
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26
src/search.cpp
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@ -281,10 +281,12 @@ namespace {
template <NodeType PvNode>
Value search(Position& pos, SearchStack ss[], Value alpha, Value beta, Depth depth, int ply, bool allowNullmove, int threadID, Move excludedMove = MOVE_NONE);
template <NodeType PvNode>
Value qsearch(Position& pos, SearchStack ss[], Value alpha, Value beta, Depth depth, int ply, int threadID);
template <NodeType PvNode>
Depth extension(const Position& pos, Move m, bool captureOrPromotion, bool moveIsCheck, bool singleEvasion, bool mateThreat, bool* dangerous);
Value qsearch(Position& pos, SearchStack ss[], Value alpha, Value beta, Depth depth, int ply, int threadID);
void sp_search(SplitPoint* sp, int threadID);
void sp_search_pv(SplitPoint* sp, int threadID);
void init_node(SearchStack ss[], int ply, int threadID);
@ -1030,6 +1032,7 @@ namespace {
assert(alpha >= -VALUE_INFINITE && alpha <= VALUE_INFINITE);
assert(beta > alpha && beta <= VALUE_INFINITE);
assert(PvNode || alpha == beta - 1);
assert(ply >= 0 && ply < PLY_MAX);
assert(threadID >= 0 && threadID < TM.active_threads());
@ -1048,7 +1051,7 @@ namespace {
oldAlpha = alpha;
if (depth < OnePly)
return qsearch(pos, ss, alpha, beta, Depth(0), ply, threadID);
return qsearch<PvNode>(pos, ss, alpha, beta, Depth(0), ply, threadID);
// Step 1. Initialize node and poll
// Polling can abort search.
@ -1118,7 +1121,7 @@ namespace {
&& !pos.has_pawn_on_7th(pos.side_to_move()))
{
Value rbeta = beta - razor_margin(depth);
Value v = qsearch(pos, ss, rbeta-1, rbeta, Depth(0), ply, threadID);
Value v = qsearch<NonPV>(pos, ss, rbeta-1, rbeta, Depth(0), ply, threadID);
if (v < rbeta)
// Logically we should return (v + razor_margin(depth)), but
// surprisingly this did slightly weaker in tests.
@ -1399,11 +1402,13 @@ namespace {
// search function when the remaining depth is zero (or, to be more precise,
// less than OnePly).
template <NodeType PvNode>
Value qsearch(Position& pos, SearchStack ss[], Value alpha, Value beta,
Depth depth, int ply, int threadID) {
assert(alpha >= -VALUE_INFINITE && alpha <= VALUE_INFINITE);
assert(beta >= -VALUE_INFINITE && beta <= VALUE_INFINITE);
assert(PvNode || alpha == beta - 1);
assert(depth <= 0);
assert(ply >= 0 && ply < PLY_MAX);
assert(threadID >= 0 && threadID < TM.active_threads());
@ -1415,7 +1420,6 @@ namespace {
bool isCheck, enoughMaterial, moveIsCheck, evasionPrunable;
const TTEntry* tte = NULL;
int moveCount = 0;
bool pvNode = (beta - alpha != 1);
Value oldAlpha = alpha;
// Initialize, and make an early exit in case of an aborted search,
@ -1434,7 +1438,7 @@ namespace {
tte = TT.retrieve(pos.get_key());
ttMove = (tte ? tte->move() : MOVE_NONE);
if (!pvNode && tte && ok_to_use_TT(tte, depth, beta, ply))
if (!PvNode && tte && ok_to_use_TT(tte, depth, beta, ply))
{
assert(tte->type() != VALUE_TYPE_EVAL);
@ -1499,9 +1503,9 @@ namespace {
ss[ply].currentMove = move;
// Futility pruning
if ( enoughMaterial
if ( !PvNode
&& enoughMaterial
&& !isCheck
&& !pvNode
&& !moveIsCheck
&& move != ttMove
&& !move_is_promotion(move)
@ -1527,8 +1531,8 @@ namespace {
&& !pos.can_castle(pos.side_to_move());
// Don't search moves with negative SEE values
if ( (!isCheck || evasionPrunable)
&& !pvNode
if ( !PvNode
&& (!isCheck || evasionPrunable)
&& move != ttMove
&& !move_is_promotion(move)
&& pos.see_sign(move) < 0)
@ -1536,7 +1540,7 @@ namespace {
// Make and search the move
pos.do_move(move, st, ci, moveIsCheck);
value = -qsearch(pos, ss, -beta, -alpha, depth-OnePly, ply+1, threadID);
value = -qsearch<PvNode>(pos, ss, -beta, -alpha, depth-OnePly, ply+1, threadID);
pos.undo_move(move);
assert(value > -VALUE_INFINITE && value < VALUE_INFINITE);
@ -2867,7 +2871,7 @@ namespace {
init_ss_array(ss);
pos.do_move(cur->move, st);
moves[count].move = cur->move;
moves[count].score = -qsearch(pos, ss, -VALUE_INFINITE, VALUE_INFINITE, Depth(0), 1, 0);
moves[count].score = -qsearch<PV>(pos, ss, -VALUE_INFINITE, VALUE_INFINITE, Depth(0), 1, 0);
moves[count].pv[0] = cur->move;
moves[count].pv[1] = MOVE_NONE;
pos.undo_move(cur->move);