[LLVMdev] [RFC] Remat Enhancements

[David A. Greene]

Jakob Stoklund Olesen <stoklund at 2pi.dk> writes:

>> This is important because if mayLoad includes arithmetic instructions
>> with source memops (which I assume it will), it is unsuitable for remat
>> analysis.  I don't think we want to remat general arithmetic quite yet.
>> At least that's not the intent of my change.  I'll need some way to
>> identify "real" loads and I don't know of any other way other than
>> listing opcodes.  Ideas?
>
> The target sets the isRematerializable bit on opcodes that are
> suitable for remat. That should be sufficient.

Ok, that should work.

> You should also check the 'canFoldAsLoad' mechanism.

Will do.  Thanks for the pointers!

                             -Dave