llvm dev - Oct 2010 - [LLVMdev] custom lowering with multiple results

I may have found a solution to the problem. The attached patch seems to
do what I was trying to do.

It's a work-around, really. What I have done is split the READ_WORLD
node (inputs: Chain; outputs: Flag, Chain) into two nodes: READ_WORLD1
(inputs: Chain; outputs, i32, Chain), and READ_WORLD2 (inputs: i32;
outputs: Flag). The pair of nodes is matched by a single pattern in the
.td file.

Is it a known limitation that you can't have a single node that
operates on both Chain and Flag?

If not, perhaps it's a bug - something that has never been tested
before because none of the current back ends do this. If nobody tells
me it's a known limitation I'll probably try to write a cogent summary
and file a bug report.






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Hello Edmund,
> Is it a known limitation that you can't have a single node that
> operates on both Chain and Flag?
There are alot of examples of nodes with both chain and flag. You can
easily find them in .td files.
As an example - ordinary call is of such form.

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University