patch introducing a hook for lra register usage leveling

[Basile Starynkevitch]

On Thu, May 30, 2013 at 04:20:46PM -0400, Vladimir Makarov wrote:
>   Investigating size increase of LRA generated code on PPC64 (> 0.2%
> on SPEC2006), I found that register usage leveling can hurt
> cross-jumping optimization for ppc besides if-conversion one for
> targets with conditional execution.
> 
> So I decided to introduce a machine target hook switching on the
> optimization (I believe introducing an option would be to much).
> The following patch implements it.  Currently only x86/x86-64 uses
> register usage leveling.


Did you consider providing plugin hooks for that purpose?

It might be a good idea, for back-end related plugins (which probably don't exist today).

Cheers.

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