Re: GCC47 movmem breaks RA, GCC46 RA is fine

["Paulo J. Matos" <paulo at matos-sorge dot com>]

On 27/04/12 11:49, Richard Guenther wrote:
> > It feels to me that GCC46 version is better:
> > * no branch to subroutine memcpy;
> > * less stack usage (argument to enterl);
> >
> > So, using our block copy (bc2) instruction is an optimisation, don't you
> > think?
>
> Yes, it inlines it.  You may want to look at s390 which I believe has
> a similar block-copy operation.

I am not sure I understood your comment. GCC46 generates the bc2 call 
due to my implementation of movmemqi. If I remove it, as you suggested, 
GCC47 will always call memcpy and will be worse off.

I will me looking at s390 for inspiration. Thanks for the suggestion.

--
PMatos