[LLVMdev] MergeInClobberRanges

[Evan Cheng]

Funny I just ran into a situation where the imprecise information  
inhibits a coalescing. If you have made changes related to this, I'd  
love to have it.

Thanks,

Evan

On Apr 7, 2008, at 10:52 AM, Evan Cheng wrote:

>
> On Apr 2, 2008, at 5:09 PM, David Greene wrote:
>
>> Why does LiveInterval::MergeInClobberRanges set the definition index
>> as unknown?  Why would the definition index not be the definition
>> index
>> for the range merged in from the other interval?  I suppose if two
>> ranges
>> overlap it's not clear what to set the def index to.  Perhaps it
>> should result
>> in two separate ranges with different def indices.
>
> Right. The coalescer is being very conservative when it comes to
> dealing with sub- / super- registers so it's not keeping very precise
> information. Feel free to make it better! :-)
>
> Evan
>
>>
>>
>>                                                  -Dave
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