[LLVMdev] [Help Needed] tblgen code get a compile error

[Dan Gohman]

On Jul 2, 2009, at 4:40 AM, Howard Su wrote:


> I am working the AVR backend. It is still in the early stage. I got  
> the following error:
> [ 86%] Building CXX object lib/Target/AVR/CMakeFiles/ 
> LLVMAVRCodeGen.dir/AVRISelDAGToDAG.cpp.obj
> AVRISelDAGToDAG.cpp
> C:\llvm-build\lib\Target\AVR\AVRGenDAGISel.inc(596) : error C2664:  
> 'llvm::SDNode *llvm::SelectionDAG::SelectNodeTo(llvm::SDNode  
> *,unsigned int,llvm::MVT,llvm::MVT,llvm::MVT,const llvm::SDValue  
> *,unsigned int)' : cannot convert parameter 6 from 'llvm::SDValue'  
> to 'const llvm::SDValue *'
>         No user-defined-conversion operator available that can  
> perform this conv
> ersion, or the operator cannot be called
>
> I checked the generated the code:
> SDNode *Emit_2(const SDValue &N, unsigned Opc0, MVT VT0)  
> DISABLE_INLINE {
>   SDValue N0 = N.getOperand(0);
>   SDValue N1 = N.getOperand(1);
>   SDNode *ResNode = CurDAG->SelectNodeTo(N.getNode(), Opc0, VT0,  
> MVT::i8, MVT::Flag, N0, N1); <==== error here.

SelectNodeTo is an overloaded function with many variations
for nodes with different numbers of types and operands. It
looks like there's no overload for 3 types and 2 operands
yet though, so you should add one.

Dan