Function npy_default_get_strided_loop

numpy/core/src/multiarray/array_method.c:136–166

* The default method to fetch the correct loop for a cast or ufunc * (at the time of writing only casts). * Note that the default function provided here will only indicate that a cast * can be done as a view (i.e., arr.view(new_dtype)) when this is trivially * true, i.e., for cast safety "no-cast". It will not recognize view as an * option for other casts (e.g., viewing '>i8' as '>i4' with an

 * @return 0 on success -1 on failure.
 */
NPY_NO_EXPORT int
npy_default_get_strided_loop(
        PyArrayMethod_Context *context,
        int aligned, int NPY_UNUSED(move_references), const npy_intp *strides,
        PyArrayMethod_StridedLoop **out_loop, NpyAuxData **out_transferdata,
        NPY_ARRAYMETHOD_FLAGS *flags)
{
    PyArray_Descr **descrs = context->descriptors;
    PyArrayMethodObject *meth = context->method;
    *flags = meth->flags & NPY_METH_RUNTIME_FLAGS;
    *out_transferdata = NULL;

    int nargs = meth->nin + meth->nout;
    if (aligned) {
        if (meth->contiguous_loop == NULL ||
                !is_contiguous(strides, descrs, nargs)) {
            *out_loop = meth->strided_loop;
            return 0;
        }
        *out_loop = meth->contiguous_loop;
    }
    else {
        if (meth->unaligned_contiguous_loop == NULL ||
                !is_contiguous(strides, descrs, nargs)) {
            *out_loop = meth->unaligned_strided_loop;
            return 0;
        }
        *out_loop = meth->unaligned_contiguous_loop;
    }
    return 0;
}


/**