Request for code review - (ZEE patch : Redundant Zero extension elimination)

[Paolo Bonzini]

On 09/24/2009 08:14 AM, Ian Lance Taylor wrote:
> I don't agree with this.  If we want this code to be x86_64 specific,
> then it should be done by having the i386 backend add the pass to the
> pass manager, much as plugins can add a pass.  Adding stuff to
> md-reorg is a step backward.

That's true.  However, time is ticking for 4.5 and this could be a 
decent interim solution while for 4.6 the appropriate hooks could be added.

I proposed md-reorg only because the patch does not include any special 
data-flow.

Paolo