[Toybox] md5sum cleanup

[Ivo van Poorten]

On Sun, 01 Jun 2014 12:00:08 -0500 Rob Landley <rob at landley.net> wrote:
> On 05/15/14 11:50, Ivo van Poorten wrote:
> > cur-hg      8.6
> > daniel      6.7
> > ivo         4.9
> > md5sum      2.8
> > openssl     2.7

The attached patch averages out to 3.2s on the same dataset and cpu.

> Could you get me a patch on top of what's currently there?

name                                           old       new      delta
-----------------------------------------------------------------------
 md5_transform                                 243      2011       1768
 md5rot                                         64         0        -64
 md5table                                      256         0       -256
-----------------------------------------------------------------------
                                                                   1448
total

Here's a new version with only a swap 'n rol macro and the rest
unrolled and inlined. Indeed a lot bigger, but also quite a bit faster.
Not yet as fast as gnu's md5sum or openssl, but we're getting closer.
Perhaps the memcpy() is becoming a bottleneck.

Regards,
Ivo
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