From a6c0ba210014b4735e7d0d27f222b0846fb6efca Mon Sep 17 00:00:00 2001 From: homoSapiensSapiens Date: Wed, 14 Aug 2013 11:17:22 +0300 Subject: [PATCH] Simplify DistanceRingsBB init Verified by same benchmark and picking some random values. No functional change. --- src/bitboard.cpp | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/src/bitboard.cpp b/src/bitboard.cpp index 39da1976..9598aa70 100644 --- a/src/bitboard.cpp +++ b/src/bitboard.cpp @@ -185,13 +185,11 @@ void Bitboards::init() { for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++) for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++) + { SquareDistance[s1][s2] = std::max(file_distance(s1, s2), rank_distance(s1, s2)); - - for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++) - for (int d = 1; d < 8; d++) - for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++) - if (SquareDistance[s1][s2] == d) - DistanceRingsBB[s1][d - 1] |= s2; + if (s1 != s2) + DistanceRingsBB[s1][SquareDistance[s1][s2] - 1] |= s2; + } int steps[][9] = { {}, { 7, 9 }, { 17, 15, 10, 6, -6, -10, -15, -17 }, {}, {}, {}, { 9, 7, -7, -9, 8, 1, -1, -8 } }; -- 2.39.2