Re: Status of SEE and Autovectorization patches?

[Roger Sayle <roger at eyesopen dot com>]

Hi Mark,

On Tue, 2 May 2006, Mark Mitchell wrote:
> Roger, I know that you reviewed the SEE patches.  Is there anything
> more than needs to be done to get them committed, in your view?

As far as I'm aware, we're still just waiting for the Haifa folks to
commit them to mainline.  There are a number of harmless code generation
changes on some platforms, but as far as we know no known performance
regressions.  And the Intel folks are keen to submit follow-up patches
for x86_64 to extend/enhance this framework once its in the tree.
And importantly there's a single command-line option/variable that
can enable/disable this pass should there be any adverse events.

However, my growing concern at the moment is the response time of
the Haifa folks.  If it's going to go into the tree in stage 3, I'd
feel more comfortable that the patch submitters/contributors looked
like they could respond to queries/issues with 24 or 48 hours.  The
current prolonged silence/inaction doesn't inspire great confidence.

Perhaps you could make the executive decision, that if it isn't in
the tree by June (or some date of your choosing), that it'll just
have to wait for 4.3?  My apologies for taking so long to review
these changes, and I and the GCC maintainership should take some of
the responsibility for the delays and current inconvenience.


It looks from the e-mail addresses that possibly the primary developer
of SEE, Leehod, is no longer at IBM but has returned to academia, with
Mircea pinging the patches.  This could explain things, but is pure
speculation.  Maybe someone could volunteer to update the posted patches
for mainline and make the minor style corrections requested in the final
review/approval?

I've Cc'd Leehod and Mircea on this e-mail, so perhaps they'll be
able to better explain the current status themselves.

Roger
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