Re: [gsoc] Generic addressing mode selection

[Oleg Endo <oleg dot endo at t-online dot de>]

On Thu, 2015-03-26 at 09:43 -0600, Jeff Law wrote:
> On 03/26/2015 08:32 AM, Erik Varga wrote:
> > Hi all,
> >
> > I've submitted my proposal to the GSoC website, it can be found here: [1]
> > After hearing some ideas from Oleg, I decided to go with working on
> > detecting and optimizing a few specific memory access patterns instead
> > of implementing a PBQP solver.
> > Any suggestions or comments are welcome.
> > I read that it's necessary to have a copyright assignment filed with
> > the Free Software Foundation to be able to contribute larger amounts
> > of code to GCC. When would it be best to start applying for a
> > copyright assignment (e.g. sometime during the community bonding
> > period, or the coding period, or around now)?

> If you're looking at exploiting auto-inc addressing, others and myself 
> have speculated that something built around 
> straight-line-strength-reduction at the RTL level would be ideal for 
> exploiting that capability.
> 
> That may be more suitable for a GSOC project than tackling the entire 
> space of address mode selections.

As far as I understand the proposal, the goal is not to solve all AMS
problems, but rather to lay the foundation for doing these kinds of
optimizations and deal with a few assorted ones (most likely auto-mod
will be a candidate).  Thus, I think Erik's proposal sounds feasible,
although I'd expect some of the allocations/priorities in the schedule
to change during the project. But that's not something unusual to
happen.

Cheers,
Oleg