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Avoid ifs by anding turn bitboard to move target mask early

master
Kaj Björklund 7 years ago
parent
4df5571f36
commit
61c19eaa8a
2 changed files with 29 additions and 30 deletions
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  1. 48
      chess.min.js
  2. 11
      src/position.js

48
chess.min.js
View File

@ -1,30 +1,30 @@
(function(){var aa="pawn knight bishop rook queen king".split(" ");function ba(a,b){return"abcdefgh"[b]+"12345678"[a]}function ca(a){return"abcdefgh".indexOf(a[0])+8*"12345678".indexOf(a[1])}function g(a){return ba(a>>>3,a&7)};function n(a,b){this.a=a>>>0;this.b=b>>>0}function da(a){a>>>=0;a-=a>>>1&1431655765;a=(a&858993459)+(a>>>2&858993459);return 16843009*(a+(a>>>4)&252645135)>>>24}function ea(a){a>>>=0;return(a&a-1)>>>0}function fa(a){a>>>=0;return da((a&-a)-1)}function p(a){return da(a.a)+da(a.b)}function ha(a){return a.a?fa(a.a):32+fa(a.b)}function t(a){var b=ha(a);a.a?a.a=ea(a.a):a.b=ea(a.b);return b}function u(a){return!a.a&&!a.b}function v(a,b){b>>>=0;return 32>b?!(a.a&1<<b):!(a.b&1<<b-32)}
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11
src/position.js
View File

@ -609,8 +609,6 @@ Chess.Position.prototype.generateMoves = function(onlyCaptures) {
}
// Positional and capture moves for knight, bishop, rook, queen, king
var turnBB = this.getColorBitboard(turnColor);
/**
* @param {number} from 0-63
* @param {!Chess.Bitboard} toMask
@ -619,13 +617,14 @@ Chess.Position.prototype.generateMoves = function(onlyCaptures) {
function addNormalMoves(from, toMask, piece) {
while (!toMask.isEmpty()) {
var to = toMask.extractLowestBitPosition();
if (turnBB.isClear(to)) {
moves.push(new Chess.Move(from, to, opponentBB.isSet(to) ? Chess.Move.Kind.CAPTURE : Chess.Move.Kind.POSITIONAL, piece, chessPosition.getPieceAtOrNull(to)));
}
moves.push(new Chess.Move(from, to, opponentBB.isSet(to) ? Chess.Move.Kind.CAPTURE : Chess.Move.Kind.POSITIONAL, piece, chessPosition.getPieceAtOrNull(to)));
}
}
var mask = onlyCaptures ? opponentBB : Chess.Bitboard.ONE;
var mask = this.getColorBitboard(turnColor).dup().not();
if (onlyCaptures) {
mask.and(opponentBB);
}
var turnKnights = this.getPieceColorBitboard(Chess.Piece.KNIGHT, turnColor).dup();
while (!turnKnights.isEmpty()) {

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