[cfe-commits] [cfe-dev] [PATCH] Asm multiple alternative constraints revisited

John Thompson john.thompson.jtsoftware at gmail.com
Fri Aug 6 09:28:57 PDT 2010

Thanks, Eli.

Then do I have permission to check in the front end changes, leaving the
back end as-is for now, treating any further work there as a separate issue
to be discussed first on llvmdev?

Basically, without these front-end changes, there will be an assert in the
front end code gen (-emit-llvm) if multi-alt constraints are seen, because
the extra commas are not expected.


On Thu, Aug 5, 2010 at 8:14 PM, Eli Friedman <eli.friedman at gmail.com> wrote:

> On Thu, Aug 5, 2010 at 7:54 PM, John Thompson
> <john.thompson.jtsoftware at gmail.com> wrote:
> > Eli,
> >
> > So, then this is a problem with the back-end, right?  Do you agree that
> the
> > back end is a better place to try to choose constraints, given that it
> knows
> > better which things are already in registers and so forth?
> Yes, it would fit more naturally there... but I'm not sure a proposal
> to make inline asm in the backend more complicated will be greeted
> with much enthusiasm.  If you're really interested in pursuing that
> path, though, ask on llvmdev first.
> -Eli

John Thompson
John.Thompson.JTSoftware at gmail.com
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