Redundant logical operations left after early splitting

[hutchinsonandy@aim.com]

fwprop is a good suggestion. If that also simplifes substitutions, it 
may be the magic bullet to collapse all of the code. I will try latter 
tonite.


-----Original Message-----
From: Paolo Bonzini <bonzini@gnu.org>
To: Andy H <hutchinsonandy@aim.com>
Cc: dave.korn@artimi.com; law@redhat.com; gcc@gcc.gnu.org
Sent: Wed, 20 Feb 2008 3:26 am
Subject: Re: Redundant logical operations left after early splitting


> Propagating REG_EQUIV notes across register-register moves would seem 
> to a obviously simple way to fix this. Thoughts? 
> I am not sure local-alloc is the best place to address the overall > 
problem, I doubt it is intended to provide such optimizations. 
> An additional cse pass after split would seem a better way perhaps? 
 
You could try adding another fwprop run after splitting. I wouldn't 
like a third instance of the pass, but it could help. 
 
Paolo 


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