[LLVMdev] FP emulation (continued)

[Chris Lattner]

On Wed, 29 Nov 2006, Roman Levenstein wrote:
> Thanks, this is a good idea.
>
> But I cannot figure out how to make a machine function pass run
> _BEFORE_ the RA. I guess I'm missing something very obvious.

In your target's TargetMachine::addInstSelector method, add it to the pass 
mgr right after your isel.

>  And BTW, it seems to me that currently new RA passes are not allowed
> to derive from the existing ones. If it is correct, why so? Wouldn't it
> be nice?

I'm not sure what you mean.  We don't expose linscan through a public 
header, but a pass in the same .cpp file could subclass it.  We haven't 
had a need to do this yet, so we don't have the provisions to do it.

-Chris

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