[LLVMdev] link getCopyToParts generated nodes

[akshay_llvm]

Hi all, 

I am new to llvm so may not be able to describe problem correctly. So,
please ask for extra details. 
I have architecture that has only i64 leagal type. 
So in getCopyToParts function to handle case with  ValueVT=f32 and
PartVT=i64, I added following code: 

if(ValueVT == EVT(MVT::f32) && PartVT == MVT::i64){ 
 SDValue IntMVal = DAG.getNode(ISD::FP_EXTEND, DL, MVT::f64, Val); 
Val = DAG.getNode(ISD::BITCAST, DL, PartVT, IntMVal); 
} 

this function when called by void RegsForValue::getCopyToRegs gives no
problem. But when called by SoftenFloatRes_FP_EXTEND(SDNode *N) while
softening result ends up with operands not processed error for 
CopyToReg node. 

the sequence generated by my code in Optimzed Lowered Selection DAG: 
          0x210f7d0: f64 = fp_extend 0x210e5b0 [ORD=4] 

        0x210f3d0: i64 = bitcast 0x210f7d0 [ORD=4] 

      0x210deb0: ch = CopyToReg 0x20d86e0, 0x21106e0, 0x210f3d0 [ORD=4] 

And failed with : 
Operand not processed? 
0x210deb0: ch = CopyToReg 0x20d86e0, 0x21106e0, 0x2125d30 [ORD=4] [ID=1] 

Clearly 3rd operand of CopyToReg is some garbage here. Don't how it changed. 

Any help is appreciated. 

Thanks, 
Akshay. 




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