[LLVMdev] Dynamically alternating between register allocators

[Devang Patel]

On Sep 5, 2007, at 6:07 PM, Chris Lattner wrote:

> This doesn't necessarily need to be in the passmanager, but I'd like
> to see the code generator grow the ability to codegen an entire
> function multiple times.  Ideally, we'd be able to codegen all the way
> to final machineinstrs in multiple configurations and then pick the
> best based on some metric.  This would allow lots of interesting
> experiments and allow people willing to wait for really good code to
> get it.  Once the "best" codegen for a function is done, the final
> machineinstrs would be sent to the asmprinter or code emitter.

This requires maintaining parallel pass queues in pass manager. Or  
use multiple instances of function pass manager for optimization 
+codegen and feed them cloned functions.

-
Devang