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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
2015-02-16 09:34:26 +08:00
committed by Gary Linscott
parent 20a5c07472
commit f8f5dcbb68
4 changed files with 17 additions and 39 deletions
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src/search.cpp
+4 -4
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@@ -173,7 +173,7 @@ uint64_t Search::perft(Position& pos, Depth depth) {
cnt = 1, nodes++;
else
{
pos.do_move(*it, st, ci, pos.gives_check(*it, ci));
pos.do_move(*it, st, pos.gives_check(*it, ci));
cnt = leaf ? MoveList<LEGAL>(pos).size() : perft<false>(pos, depth - ONE_PLY);
nodes += cnt;
pos.undo_move(*it);
@@ -702,7 +702,7 @@ namespace {
if (pos.legal(move, ci.pinned))
{
ss->currentMove = move;
pos.do_move(move, st, ci, pos.gives_check(move, ci));
pos.do_move(move, st, pos.gives_check(move, ci));
value = -search<NonPV, false>(pos, ss+1, -rbeta, -rbeta+1, rdepth, !cutNode);
pos.undo_move(move);
if (value >= rbeta)
@@ -894,7 +894,7 @@ moves_loop: // When in check and at SpNode search starts from here
quietsSearched[quietCount++] = move;
// Step 14. Make the move
pos.do_move(move, st, ci, givesCheck);
pos.do_move(move, st, givesCheck);
// Step 15. Reduced depth search (LMR). If the move fails high it will be
// re-searched at full depth.
@@ -1255,7 +1255,7 @@ moves_loop: // When in check and at SpNode search starts from here
ss->currentMove = move;
// Make and search the move
pos.do_move(move, st, ci, givesCheck);
pos.do_move(move, st, givesCheck);
value = givesCheck ? -qsearch<NT, true>(pos, ss+1, -beta, -alpha, depth - ONE_PLY)
: -qsearch<NT, false>(pos, ss+1, -beta, -alpha, depth - ONE_PLY);
pos.undo_move(move);