[PATCH] Modify the register scavenger to operate on reg units when checking liveness

[Pedro Artigas]

It (the CRS bit vector) is unused, it will be removed once I check in my changes to the scavenger.

Thanks,

Pedro

> On Jul 31, 2014, at 2:35 PM, Jakob Stoklund Olesen <jolesen at apple.com> wrote:
> 
> 
>> On Jul 31, 2014, at 2:29 PM, Chad Rosier <mcrosier at codeaurora.org> wrote:
>> 
>>> 
>>> -    // Create callee-saved registers bitvector.
>>> +    // Create callee-saved registers bitvector. (FIXME: Why is this
>>> needed?)
>> 
>> I believe the callee-saved register is an ancient artifact.
>> 
>> Jakob simplified the FindUnusedReg function here:
>> http://llvm.org/viewvc/llvm-project?view=revision&revision=79369
>> 
>> AFAICK, this should have been removed at that time.
> 
> Wow, that’s a long time ago, I don’t remember the details.
> 
> But it should be trivial to determine if the CSR bitvector is used for anything and delete it if it is unused.
> 
> Thanks,
> /jakob
>