[LLVMdev] LLVM register number for MIPS DAGToDAG

[Quentin Colombet]

> On Feb 27, 2015, at 1:59 AM, Ambuj Agrawal <ambujbwt at gmail.com> wrote:
> 
> Is it possible to get a register number to which the value is allocated to in MIPS in DAGToDAG class?
> 
> More Specifically:
>                     SDValue Reg3 = Node->getOperand(3);   
>                     if (RegisterSDNode *R = dyn_cast<RegisterSDNode>(Reg3))
>                     {
>                         op3 = cast<RegisterSDNode>(Reg3)->getReg();
>                         fprintf(stderr,"Op3 is register and regnum is %d\n",op3);
>                     }
>                     else if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Reg3))
>                     {
>                         op3 = C->getZExtValue();   
>                         fprintf(stderr,"Op3 is constant and value is %d\n",op3);             
>                     }
> 
> When I run this code Reg3 is found out to be a ConstantSDNode but is stored in the register in assembly. I want to store the value in register but also need the register number to which the value is allocated.

The registers are allocated much later in the pipeline. At this stage, these are virtual registers.

What are you trying to achieved?

Cheers,
-Quentin

> 
> Thanks,
> Ambuj Agrawal
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