[LLVMdev] Splitting a load with 2 consumers into 2 loads.
joe at pusdesris.com
Sat Dec 1 20:01:42 PST 2012
Yes, changing parameters will create a new Node, but is there some way I
can force a new node with the same parameters?
On Sat, Dec 1, 2012 at 10:57 PM, Triple Yang <triple.yang at gmail.com> wrote:
> Hi, Joseph, I guess getLoad() will either search an existed SDValue
> *OR* create a new one for a non-existed one depending on real
> Since you use exactly the same attributes dupVal/dupNode have, no
> doubt getLoad() return the old one.
> I am not sure it's *volatile* that let you get a new result, you might
> want to try change some other parameters and check what it turns out.
> 2012/12/2 Joseph Pusdesris <joe at pusdesris.com>
> > So I think I have made some progress.
> > SDValue dupVal = consumer->getOperand(OpNo);
> > LoadSDNode *dupNode = (LoadSDNode*) dupVal.getNode();
> > SDValue newLoad = CurDAG->getLoad(dupVal.getValueType(),
> > dupVal.getOperand(0),
> > dupNode->getPointerInfo(),
> > dupNode->isVolatile(),
> > dupNode->isInvariant(),
> > dupNode->getTBAAInfo(),
> > However, my problem now is that it will re-use the same load still. If
> I change something, like setting volatile to true for example, it will
> create a new node, but otherwise it will not. Any ideas?
> > -Joe
> > On Fri, Nov 30, 2012 at 9:55 PM, Joseph Pusdesris <joe at pusdesris.com>
> >> Hi, I am writing an llvm target and I need both loads for isel reasons,
> but I am struggling to find the right way. I have been trying to use
> DAG.getLoad() to make a copy, then just change the operand in the
> consumers, but I cannot seem to get all of the arguments needed for that
> function in order to make the copy. Any help would be great, thanks!
> >> -Joe
> > _______________________________________________
> > LLVM Developers mailing list
> > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> 杨勇勇 (Yang Yongyong)
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the llvm-dev