[LLVMdev] Suggested base version for adding a new backend?

[Chris Lattner]

I agree, I'd strongly recommend ToT as well.

-Chris

On Sep 19, 2011, at 10:59 AM, Garrison Venn <gvenn.cfe.dev at gmail.com> wrote:

> Personally I would use TOT.
> 
> Obviously my 2 cents
> 
> Garrison
> 
> On Sep 19, 2011, at 12:54, Philip Reames wrote:
> 
>> Good morning,
>> 
>> What is the general consensus about using LLVM 2.9 vs tip of tree for 
>> developing new backends?  Is LLVM 2.9 still recent enough to make 
>> forward porting easy once 3.0 comes out?  Is tip of tree considered 
>> stable enough for non-core development?
>> 
>> My reason for asking is that a fellow grad student and I are about to 
>> start implementing a new backend for RISK-V - a research architecture 
>> developed here at UC Berkeley.  We're looking to focus our work on the 
>> backend itself and do not currently intend to do core LLVM development. 
>> As such, we're looking for a base which is going to be stable to work 
>> with, but also easy to maintain as future releases come out.
>> 
>> Normally, I would be fairly confident in using LLVM 2.9 as a base, but 
>> I've been following the mailing lists for a while now and there seems to 
>> have been a fair amount of code churn and a whole new set of best 
>> practices with respect to backends.  I've also seen a couple of posts 
>> asking about issues in 2.9 with responses that essentially came down to 
>> "use TOT".  Together, this leaves me wondering if 2.9 is such a good 
>> base for development after all.
>> 
>> Thank you for taking the time to consider my question.
>> 
>> Philip Reames
>> Graduate Student
>> EECS, UC Berkeley
>> 
>> For anyone interested, the technical report covering the ISA for the 
>> RISK-V architecture can be found here:
>> http://www.eecs.berkeley.edu/Pubs/TechRpts/2011/EECS-2011-62.pdf
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