Function PyArray_CreateSortedStridePerm

numpy/core/src/multiarray/shape.c:773–788

NUMPY_API * * This function populates the first ndim elements * of strideperm with sorted descending by their absolute values. * For example, the stride array (4, -2, 12) becomes * [(2, 12), (0, 4), (1, -2)]. */

 * [(2, 12), (0, 4), (1, -2)].
 */
NPY_NO_EXPORT void
PyArray_CreateSortedStridePerm(int ndim, npy_intp const *strides,
                        npy_stride_sort_item *out_strideperm)
{
    int i;

    /* Set up the strideperm values */
    for (i = 0; i < ndim; ++i) {
        out_strideperm[i].perm = i;
        out_strideperm[i].stride = strides[i];
    }

    /* Sort them */
    qsort(out_strideperm, ndim, sizeof(npy_stride_sort_item),
                                    &_npy_stride_sort_item_comparator);
}

static inline npy_intp
s_intp_abs(npy_intp x)