[LLVMdev] Question about coalescing

[Fernando Magno Quintao Pereira]

Dear Dave, Evan, thank you for answering.

     What I did was to remove the implementation of most of the methods of 
SimpleRegisterCoalescing and put them in a single class 
(RegisterCoalescer_Impl) that is not an analysis. Any class that wants 
these methods, can extend this class privately, or can use a reference to 
an RegisterCoalescer_Impl object. I wish it would be possible to go even 
further: given that I know that two virtuals do not interfere, I would 
like to coalesce them by simply joining their interval representation. 
When I call JoinCopy, the method does that, but it checks again a lot of 
information that I already know: do not overlap, are virtuals, etc.

best,

Fernando

>
> On Dec 15, 2007, at 4:45 PM, Fernando Magno Quintao Pereira wrote:
>
>>
>> Dear guys,
>>
>>     I want to coalesce some copies, and I would like to know if
>> there is
>> any method that I can call, like JoinCopy from the old (LLVM 1.9)
>> LiveIntervals class. I found it in SimpleRegisterCoalescing (LLVM
>> 2.1),
>> but I do not want to call this analysis, as I have my own.
>>
>>     basically, I can determine that two virtuals do not overlap, and I
>> know that it is safe to join them. In the old v1.9, I simply had to do
>> this:
>>
>>     this->interval_analysis_->JoinCopy(mach_inst, use_eg, def_reg);
>
> SimpleRegisterCoalescing::JoinCopy hasn't fundamentally changed from
> the old JoinCopy. It still does the same sort of analysis. The only
> change really is the interface.
>
> Evan
>
>>
>>
>> best,
>>
>> Fernando
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