[LLVMdev] Splitting a load with 2 consumers into 2 loads.

[Joseph Pusdesris]

Yes, changing parameters will create a new Node, but is there some way I
can force a new node with the same parameters?
-Joe


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
> parameters.
>
> 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.
>
> Regards.
>
> 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.getDebugLoc(),
> >                                dupVal.getOperand(0),
> dupVal.getOperand(1),
> >                                dupNode->getPointerInfo(),
> >                                dupNode->isVolatile(),
> dupNode->isNonTemporal(),
> >                                dupNode->isInvariant(),
> dupNode->getAlignment(),
> >                                dupNode->getTBAAInfo(),
> dupNode->getRanges());
> > 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>
> wrote:
> >>
> >> 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)
>
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