[PATCH][RegAlloc] Make tryInstructionSplit less aggressive.

[Jakob Stoklund Olesen]

On Dec 20, 2013, at 1:20 PM, Quentin Colombet <qcolombet at apple.com> wrote:

> Thanks Jakob for the quick reply.
> 
> On Dec 20, 2013, at 12:41 PM, Jakob Stoklund Olesen <stoklund at 2pi.dk> wrote:
> 
>> Hi Quentin,
>> 
>> You also need to handle MI operands that don’t have RC constraints, and operands with sub-register indexes. Look at MRI::recomputeRegClass().
> When you say MI operands that don’t have RC constraints you mean the ones that have NULL RC constraints, right?

Right. NULL means unconstrained, like COPY for example.

/jakob

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