-load-combine status request

Michael Spencer via llvm-commits llvm-commits at lists.llvm.org
Thu Sep 24 22:34:02 PDT 2015

On Thu, Sep 24, 2015 at 12:12 PM, Eric Christopher <echristo at gmail.com> wrote:
> Hi Michael,
>> > I notice that the -load-combine pass is not being used since its initial
>> > commit in r209791.
>> > What's the status on this? Should it be removed? Are there any plan to
>> > use
>> > it at some point in the future?
>> >
>> > Thanks,
>> > -- Larisse.
>> It's waiting for a machine pass to do load slicing to be enabled by
>> default. I've been planning on doing this, but it's not going to
>> happen soon.
> So, what would you like to do then? :)
> It's been pretty much dead code since it was committed more than a year ago
> and we try to avoid keeping dead code in tree. It's not a ton of work to
> keep it updated, but that's all that's happened to the pass in the mean time
> and we don't have any idea when it might be usable.
> Thoughts?
> -eric

So it actually appears that someone has written a load slicer since
that went in. I'll figure out next week if it fixes the performance
problems I was encountering before and hopefully turn it on. If not
I'm fine with removing it.

- Michael Spencer

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