Function _is_natively_aligned_at

numpy/core/src/multiarray/buffer.c:140–180

* Return non-zero if a type is aligned in each item in the given array, * AND, the descr element size is a multiple of the alignment, * AND, the array data is positioned to alignment granularity. */

 * AND, the array data is positioned to alignment granularity.
 */
static inline int
_is_natively_aligned_at(PyArray_Descr *descr,
                        PyArrayObject *arr, Py_ssize_t offset)
{
    int k;

    if (NPY_LIKELY(descr == PyArray_DESCR(arr))) {
        /*
         * If the descriptor is the arrays descriptor we can assume the
         * array's alignment is correct.
         */
        assert(offset == 0);
        if (PyArray_ISALIGNED(arr)) {
            assert(descr->elsize % descr->alignment == 0);
            return 1;
        }
        return 0;
    }

    if ((Py_ssize_t)(PyArray_DATA(arr)) % descr->alignment != 0) {
        return 0;
    }

    if (offset % descr->alignment != 0) {
        return 0;
    }

    if (descr->elsize % descr->alignment) {
        return 0;
    }

    for (k = 0; k < PyArray_NDIM(arr); ++k) {
        if (PyArray_DIM(arr, k) > 1) {
            if (PyArray_STRIDE(arr, k) % descr->alignment != 0) {
                return 0;
            }
        }
    }

    return 1;
}

/*
 * Fill in str with an appropriate PEP 3118 format string, based on