// Copy a1 to a2 for index tuples that are valid for both arrays.
static void copyArray(AbstractArray a1, AbstractArray a2) {
Debug.assertTrue(a1.getRank() == a2.getRank());
int[] subscripts = new int[a1.getRank()];
int axis = 0;
copySubArray(a1, a2, subscripts, axis);
}
private static void copySubArray(AbstractArray a1, AbstractArray a2, int[] subscripts, int axis) {
if (axis < subscripts.length) {
final int limit = Math.min(a1.getDimension(axis), a2.getDimension(axis));
for (int i = 0; i < limit; i++) {
subscripts[axis] = i;
copySubArray(a1, a2, subscripts, axis + 1);
}
} else {
int i1 = a1.getRowMajorIndex(subscripts);
int i2 = a2.getRowMajorIndex(subscripts);
a2.aset(i2, a1.AREF(i1));
}
}