[FFmpeg-devel] [PATCH 1/5] Shrink the size of vp56_mv

[Reimar Döffinger]

On Tue, Jun 15, 2010 at 09:13:59PM +0100, M?ns Rullg?rd wrote:
> Reimar D?ffinger <Reimar.Doeffinger at gmx.de> writes:
> > In addition to what Michael said:
> > That doesn't help if e.g. there's some code like
> > mv->x = ...(some int)
> > if (mv->x ...)
> > for which this change would result in useless sign extension.
> 
> Unless the compiler manages to prove it's not needed.  GCC may or may
> not do that.  Why don't you compile it both ways and compare code size
> if you care that deeply?

I don't really care at all, I just suggested that benchmarking might make
sense, since a lot of people miss that the speed impact of it is not quite
that obvious.