[LLVMdev] Selecting FrameIndex

[Scott Michel]

someguy wrote:
> But there is no explicit pattern to match FrameIndex in the .td files,
> even though I've specified 'frameindex' in the 'roots' of the
> addressing mode ComplexPattern. The result is that I get a
> CannotYetSelect on the FrameIndex operand during selection.
>
> Anyone know what i'm doing wrong?
>   
You're not doing anything wrong, you've just made friends with the 
common subexpression eliminator. :-)

Have a look at the PPC or CellSPU backends' SelectionDAGISel::Select() 
method.. You end up catching the ISD::FrameIndex node during instruction 
selection and then doing something "useful" with it. In the CellSPU's 
case, the ISD::FrameIndex node is turned into an add and the result 
stored in a register.


-scooter