From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Sun, 11 Nov 2018 21:18:28 +0000 (+0100)
Subject: Speed up check info calculation
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=c76c427821870c48fb5f810366a84e7b18d6af90;p=fairystockfish.git

Speed up check info calculation

No functional change.
---

diff --git a/src/position.cpp b/src/position.cpp
index ecf827c..67c38d0 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -470,7 +470,8 @@ void Position::set_check_info(StateInfo* si) const {
 
   Square ksq = count<KING>(~sideToMove) ? square<KING>(~sideToMove) : SQ_NONE;
 
-  for (PieceType pt = PAWN; pt < KING; ++pt)
+  // For unused piece types, the check squares are left uninitialized
+  for (PieceType pt : piece_types())
       si->checkSquares[pt] = ksq != SQ_NONE ? attacks_from(~sideToMove, pt, ksq) : 0;
   si->checkSquares[KING]   = 0;
   si->shak = si->checkersBB & (byTypeBB[KNIGHT] | byTypeBB[ROOK] | byTypeBB[BERS]);
@@ -651,7 +652,7 @@ Bitboard Position::slider_blockers(Bitboard sliders, Square s, Bitboard& pinners
   Bitboard blockers = 0;
   pinners = 0;
 
-  if (s == SQ_NONE)
+  if (s == SQ_NONE || !sliders)
       return blockers;
 
   // Snipers are sliders that attack 's' when a piece is removed