From: Marco Costalba <mcostalba@gmail.com>
Date: Sat, 7 Dec 2013 10:33:31 +0000 (+0100)
Subject: More readable init of MS1BTable[]
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=1ff5ce8863cb71f42dc0f707dd566e566c658eb5;ds=sidebyside

More readable init of MS1BTable[]

Because now it uses lsb(), the BSFTable[] must be
already initialized.

No functional change.
---

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index 3597e7d8..fd3db671 100644
--- a/src/bitboard.cpp
+++ b/src/bitboard.cpp
@@ -151,13 +151,12 @@ const std::string Bitboards::pretty(Bitboard b) {
 
 void Bitboards::init() {
 
-  for (int k = 0, i = 0; i < 8; ++i)
-      while (k < (2 << i))
-          MS1BTable[k++] = i;
-
   for (Square s = SQ_A1; s <= SQ_H8; ++s)
       BSFTable[bsf_index(SquareBB[s] = 1ULL << s)] = s;
 
+  for (Bitboard b = 1; b < 256; ++b)
+      MS1BTable[b] = more_than_one(b) ? MS1BTable[b - 1] : lsb(b);
+
   FileBB[FILE_A] = FileABB;
   RankBB[RANK_1] = Rank1BB;