[Python-checkins] cpython: Since the index is always non-negative, use faster unsigned division and modulo.

[Terry Reedy]

On 2/27/2015 3:43 PM, raymond.hettinger wrote:
> https://hg.python.org/cpython/rev/91a1613e161c
> changeset:   94780:91a1613e161c
> user:        Raymond Hettinger <python at rcn.com>
> date:        Fri Feb 27 12:42:54 2015 -0800
> summary:
>    Since the index is always non-negative, use faster unsigned division and modulo.

> -        n = i / BLOCKLEN;
> +        assert(i >= 0);
> +        n = (Py_ssize_t)((unsigned) i / BLOCKLEN);
> +        i = (Py_ssize_t)((unsigned) i % BLOCKLEN);
>           i %= BLOCKLEN;

Should this last line be removed after being replaced by the line above? 
  I believe it is now a time-wasting no-op after the addition.

Terry