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Compute checkers from scratch

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This micro-optimization only complicates the code and provides no benefit.
Removing it is even a speedup on my machine (i7-3770k, linux, gcc 4.9.1):

stat        test     master    diff
mean   2,403,118  2,390,904  12,214
stdev     12,043     10,620   3,677

speedup       0.51%
P(speedup>0) 100.0%

No functional change.
This commit is contained in:
lucasart
2015-02-15 15:49:20 +08:00
committed by Marco Costalba
parent 901bfb1f55
commit dc13004283
4 changed files with 17 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/syzygy/tbprobe.cpp
+8 -8
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@@ -369,7 +369,7 @@ static int probe_ab(Position& pos, int alpha, int beta, int *success)
if (!pos.capture(capture) || type_of(capture) == ENPASSANT
|| !pos.legal(capture, ci.pinned))
continue;
pos.do_move(capture, st, ci, pos.gives_check(capture, ci));
pos.do_move(capture, st, pos.gives_check(capture, ci));
v = -probe_ab(pos, -beta, -alpha, success);
pos.undo_move(capture);
if (*success == 0) return 0;
@@ -432,7 +432,7 @@ int Tablebases::probe_wdl(Position& pos, int *success)
if (type_of(capture) != ENPASSANT
|| !pos.legal(capture, ci.pinned))
continue;
pos.do_move(capture, st, ci, pos.gives_check(capture, ci));
pos.do_move(capture, st, pos.gives_check(capture, ci));
int v0 = -probe_ab(pos, -2, 2, success);
pos.undo_move(capture);
if (*success == 0) return 0;
@@ -495,7 +495,7 @@ static int probe_dtz_no_ep(Position& pos, int *success)
if (type_of(pos.moved_piece(move)) != PAWN || pos.capture(move)
|| !pos.legal(move, ci.pinned))
continue;
pos.do_move(move, st, ci, pos.gives_check(move, ci));
pos.do_move(move, st, pos.gives_check(move, ci));
int v = -probe_ab(pos, -2, -wdl + 1, success);
pos.undo_move(move);
if (*success == 0) return 0;
@@ -517,7 +517,7 @@ static int probe_dtz_no_ep(Position& pos, int *success)
if (pos.capture(move) || type_of(pos.moved_piece(move)) == PAWN
|| !pos.legal(move, ci.pinned))
continue;
pos.do_move(move, st, ci, pos.gives_check(move, ci));
pos.do_move(move, st, pos.gives_check(move, ci));
int v = -Tablebases::probe_dtz(pos, success);
pos.undo_move(move);
if (*success == 0) return 0;
@@ -536,7 +536,7 @@ static int probe_dtz_no_ep(Position& pos, int *success)
Move move = moves->move;
if (!pos.legal(move, ci.pinned))
continue;
pos.do_move(move, st, ci, pos.gives_check(move, ci));
pos.do_move(move, st, pos.gives_check(move, ci));
if (st.rule50 == 0) {
if (wdl == -2) v = -1;
else {
@@ -612,7 +612,7 @@ int Tablebases::probe_dtz(Position& pos, int *success)
if (type_of(capture) != ENPASSANT
|| !pos.legal(capture, ci.pinned))
continue;
pos.do_move(capture, st, ci, pos.gives_check(capture, ci));
pos.do_move(capture, st, pos.gives_check(capture, ci));
int v0 = -probe_ab(pos, -2, 2, success);
pos.undo_move(capture);
if (*success == 0) return 0;
@@ -702,7 +702,7 @@ bool Tablebases::root_probe(Position& pos, Search::RootMoveVector& rootMoves, Va
// Probe each move.
for (size_t i = 0; i < rootMoves.size(); i++) {
Move move = rootMoves[i].pv[0];
pos.do_move(move, st, ci, pos.gives_check(move, ci));
pos.do_move(move, st, pos.gives_check(move, ci));
int v = 0;
if (pos.checkers() && dtz > 0) {
ExtMove s[192];
@@ -812,7 +812,7 @@ bool Tablebases::root_probe_wdl(Position& pos, Search::RootMoveVector& rootMoves
// Probe each move.
for (size_t i = 0; i < rootMoves.size(); i++) {
Move move = rootMoves[i].pv[0];
pos.do_move(move, st, ci, pos.gives_check(move, ci));
pos.do_move(move, st, pos.gives_check(move, ci));
int v = -Tablebases::probe_wdl(pos, &success);
pos.undo_move(move);
if (!success) return false;