chess-legal-moves/dist/createNewGameScan/BitBoard/int32Utils.js

Analyses a given chess game position in Fen notation to return legal moves and provides the next game position after a given move

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function generateMSBTable(max) {
    var res = [];
    var int;
    for (int = 1; int <= max; int++) {
        res[int] = Math.floor(Math.log2(int));
    }
    return res;
}
var mostSigBitTable = generateMSBTable(255);
function popCount32(int) {
    int -= (int >>> 1) & 0x55555555;
    int = (int & 0x33333333) + ((int >>> 2) & 0x33333333);
    return (((int + (int >>> 4)) & 0xf0f0f0f) * 0x1010101) >>> 24;
}
function bitScanForward32(int) {
    return popCount32((int & -int) - 1);
}
function bitScanReverse32(int) {
    var res = 0;
    if (int > 0xffff) {
        int >>>= 16;
        res += 16;
    }
    if (int > 0xff) {
        int >>>= 8;
        res += 8;
    }
    return res + mostSigBitTable[int];
}
function clearLeastSigBit32(int) {
    return int & (int - 1);
}
exports.default = {
    popCount32: popCount32,
    bitScanForward32: bitScanForward32,
    bitScanReverse32: bitScanReverse32,
    clearLeastSigBit32: clearLeastSigBit32,
};