Function _bad_strides

numpy/core/src/common/cblasfuncs.c:187–208

* This also makes sure that the data segment is aligned with * an itemsize address as well by returning one if not true. */

 * an itemsize address as well by returning one if not true.
 */
NPY_NO_EXPORT int
_bad_strides(PyArrayObject *ap)
{
    int itemsize = PyArray_ITEMSIZE(ap);
    int i, N=PyArray_NDIM(ap);
    npy_intp *strides = PyArray_STRIDES(ap);
    npy_intp *dims = PyArray_DIMS(ap);

    if (((npy_intp)(PyArray_DATA(ap)) % itemsize) != 0) {
        return 1;
    }
    for (i = 0; i < N; i++) {
        if ((strides[i] < 0) || (strides[i] % itemsize) != 0) {
            return 1;
        }
        if ((strides[i] == 0 && dims[i] > 1)) {
            return 1;
        }
    }

    return 0;
}

/*
 * dot(a,b)