From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Tue, 28 Aug 2018 18:19:27 +0000 (+0200)
Subject: Speed up attackers_to
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=fd7f52f4e481da34a928ecb7024ee760e539a030;p=fairystockfish.git

Speed up attackers_to

Loop only over relevant piece types for a speed-up with no functional change.
---

diff --git a/src/position.cpp b/src/position.cpp
index c2b40da..9cc14b8 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -658,7 +658,7 @@ Bitboard Position::attackers_to(Square s, Bitboard occupied) const {
 
   Bitboard b = 0;
   for (Color c = WHITE; c <= BLACK; ++c)
-      for (PieceType pt = PAWN; pt <= KING; ++pt)
+      for (PieceType pt : piece_types())
           b |= attacks_bb(~c, pt, s, occupied) & pieces(c, pt);
   return b;
 }