[llvm-commits] [PATCH] extend fix to PR12312 to support 256-bit vector

[Michael Liao]

Here is the revised/separate patch fixing type legalization. Test case
is added as well.

Yours
- Michael

On Thu, 2012-09-06 at 09:50 -0700, Michael Liao wrote:
> On Thu, 2012-09-06 at 09:59 +0200, Duncan Sands wrote:
> > Hi Michael,
> > 
> > > --- a/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp
> > > +++ b/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp
> > > @@ -108,6 +108,47 @@ void DAGTypeLegalizer::ExpandRes_BITCAST(SDNode *N, SDValue &Lo, SDValue &Hi) {
> > >
> > >        return;
> > >      }
> > > +
> > > +    // If <NOutVT x 2> is not a legal type, try <ExtOutVT x (2*f)>, where
> > > +    // f = bits(NOutVT)/bits(ExtOutVT).
> > > +    EVT ExtOutVT = TLI.getTypeToExpandTo(*DAG.getContext(), OutVT);
> > 
> > I'm confused - isn't ExtOutVT equal to NOutVT?
> 
> NOutVT is calculated from TLI.getTypeToTransformTo(), roughtly from
> N-bit integer to N/2 interger and the result type is not necessarily
> legal.
> 
> ExtOutVT is calculated from TLI.getTypeToExpandTo() and the result is
> guaranteed to be legal and it's the largest type.
> 
> Yours
> - Michael
> 
> > 
> > Ciao, Duncan.
> > _______________________________________________
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> 
> 
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