[LLVMdev] New Configure Option for LLVM Builds

[John Criswell]

On 6/20/11 10:39 AM, Justin Holewinski wrote:
> For the PTX back-end, I would like to introduce a configure-time 
> option to determine the number of architectural registers available to 
> LLVM register allocation during code generation.  The motivation for 
> this is PTX is a virtual instruction set and the number of registers 
> is configurable in the output file.  Thus, the number of registers 
> specified via tablegen is arbitrary.  For different use-cases, it may 
> be desirable to change this number.

Is it possible to make this option a command-line option to llc instead 
of a configure-time option?

In my experience, it's better to make these options command-line options 
to tools when possible; that way, when someone wants to experiment with 
changing the parameter, they do not need to recompile.

-- John T.

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