[LLVMdev] #ifdef in TableGen

[Chris Lattner]

On Feb 16, 2009, at 4:37 PM, [Alex] wrote:

>
>
> Chris Lattner-2 wrote:
>>
>> Not as such, what are you trying to do?
>>
>
> For example, sometimes I want some patterns to be matched by one  
> machine
> instruction and sometimes two or more. I am doing the development  
> for an
> experimental compiler and nothing is sure. I have source code in the  
> backend
> looking for some specific opcode and they are conditional compiled
> (controllled by #ifdef..#endif).

Your best bet is to run cpp over the .td files before you run them  
through tblgen then.

For mainline development, we don't want to support this.

-Chris