[LLVMdev] Going from argument to register and back

[Chris Lattner]

On Sep 29, 2008, at 9:10 AM, Villmow, Micah wrote:

> One of the requirements for the backend that I am targeting is  
> certain meta-data needs to be returned to the runtime. This includes  
> the mapping between parameters and the locations this data is  
> expected to be stored at. This is mainly because there are multiple  
> address spaces and each one is mapped differently but all are  
> assigned registers from the same register class. So this mapping  
> needs to be known at compile time and passed in the generated code  
> to the runtime to be processed before execution.

The typical solution to this is to have a one "load" instruction for  
each address space.  The load for address space #17 knows that it is  
for that addr space.  Instruction selection handles its generation,  
and the asmprinter hook can print whatever metadata you want.

-Chris 
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