private static IntArray toIndexArray(long[] supportA, long[] supportB, IntArray indices) {
if (indices == null) {
indices = new IntArray();
} else {
indices.clear();
}
for (int i = 0; i < supportA.length; i++) {
long commonSupport = supportA[i] & supportB[i];
while (commonSupport != 0) {
final int index = Long.numberOfTrailingZeros(commonSupport);
indices.add(index + i * 64);
commonSupport ^= (1L << index);
}
}
return indices;
}
