[LLVMdev] Tablegen: How to define a Pattern with multiple result instructions

[kewuzhang]

Dear Tom,

What is the advantage to use  the “pseudo instruction” approach VS “custom lowering/DAGtoDAGSelection”  VS “ Library function”?

Best

Kevin



On Aug 14, 2014, at 9:27 AM, Tom Stellard <tom at stellard.net> wrote:

> On Thu, Aug 14, 2014 at 12:05:33AM -0700, Arsen Hakobyan wrote:
>> Hi all,
>> 
>> I would like to be sure that Tablegen still does not support completely
>> separate multiple instruction generation, and the only way is to write
>> costume code (may be in TargetISelDAGToDAG class) to get the needed result.
>> 
>> Dear Tom, do you found other solution (using Tablegen tool) for this?
>> 
> 
> I think the best way to do this is to use a pseudo instruction and then
> expand it after instruction selection by using a custom inserter.
> 
> -Tom
> 
>> Thanks,
>> Arsen
>> 
>> 
>> 
>> --
>> View this message in context: http://llvm.1065342.n5.nabble.com/Tablegen-How-to-define-a-Pattern-with-multiple-result-instructions-tp44115p71453.html
>> Sent from the LLVM - Dev mailing list archive at Nabble.com.
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