[PATCH] Add a callback to FunctionPass to enable skipping execution on a per-function basis

[Sean Silva]

Adding Paul as this seems related to optnone.

On Wed, Apr 8, 2015 at 7:31 PM, Chandler Carruth <chandlerc at gmail.com>
wrote:

> I feel like we could do something much simpler than this. This feeling is
> predicated on one primary theory: most passes will run for most subtargets.
> Put another way, there will only be a small number of passes that we
> actually want to opt out of on a per-subtarget basis.
>
> If we think that's likely to be the case, here is an alternative
> suggestion:
>
> - Add bool-returning predicates for each pass to the subtarget base class
> (eg, "isIfConversionProfitable()") with the expected default ("true").
> - Override these for the subtargets that want to opt out.
> - Change the pass to directly get the subtarget, query it, and bail
> without doing anything if it gets "false".
>
> From looking at and thinking about if-conversion at least, this seems
> nicer to me. It makes someone working on the pass aware that there are
> subtarget profitability concerns, and it makes it very clear that we are
> *running* all of the passes, just that some have no effect on certain
> subtargets.
>
> This also matches how an optimization pass should query the function for
> the 'noopt' attribute and bail.
>
> Thoughts?
>
>
> http://reviews.llvm.org/D8717
>
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