From: Marco Costalba <mcostalba@gmail.com>
Date: Sun, 30 Aug 2009 16:17:44 +0000 (+0100)
Subject: Skip TT_MOVES phase when possible
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=1130c8d8153b2132c4352324421f342e9c50b08e;p=fairystockfish.git

Skip TT_MOVES phase when possible

If we don't have tt moves to search skip the
useless loop associated with TT_MOVES phase.

Another 1% speed boost that brings this series
to a +6.2% against original revision 595a90df

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
---

diff --git a/src/movepick.cpp b/src/movepick.cpp
index 7120ba0..5c0f4f5 100644
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -61,10 +61,12 @@ namespace {
 
 MovePicker::MovePicker(const Position& p, Move ttm, Depth d,
                        const History& h, SearchStack* ss) : pos(p), H(h) {
+  int searchTT = ttm;
   ttMoves[0].move = ttm;
   if (ss)
   {
       ttMoves[1].move = (ss->mateKiller == ttm)? MOVE_NONE : ss->mateKiller;
+      searchTT |= ttMoves[1].move;
       killers[0].move = ss->killers[0];
       killers[1].move = ss->killers[1];
   } else
@@ -81,11 +83,11 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d,
   if (p.is_check())
       phasePtr = EvasionsPhaseTable;
   else if (d > Depth(0))
-      phasePtr = MainSearchPhaseTable;
+      phasePtr = MainSearchPhaseTable + !searchTT;
   else if (d == Depth(0))
-      phasePtr = QsearchWithChecksPhaseTable;
+      phasePtr = QsearchWithChecksPhaseTable + !searchTT;
   else
-      phasePtr = QsearchWithoutChecksPhaseTable;
+      phasePtr = QsearchWithoutChecksPhaseTable + !searchTT;
 
   phasePtr--;
   go_next_phase();