Slow memcmp for aligned strings on Pentium 3

[Zack Weinberg]

Kevin Atkinson <kevin@atkinson.dhs.org> writes:

> I was doing some tests with with memcmp and it seams that gcc 3.2.2 always
> uses cmps, even for aligned strings.
>
> I did some tests and discovered that using cmps was rather slow, compared 
> to a simple loop and then a bswap and subtract at the end.

Patches are welcome.

zw