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Re: [dataflow]: patch committed to improve -O0 performance.

From: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
To: Kenneth Zadeck <zadeck at naturalbridge dot com>
Cc: gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Wed, 28 Mar 2007 22:40:05 +0200
Subject: Re: [dataflow]: patch committed to improve -O0 performance.
References: <460A95A8.4070400@naturalbridge.com> <460A977D.9090902@lu.unisi.ch> <460AAB59.3030504@naturalbridge.com>
Reply-to: bonzini at gnu dot org

Kenneth Zadeck wrote:
> Paolo Bonzini wrote:
>> I'm wondering, many passes that use DF_LIVE could actually use
>> DF_LR.  If they sum up substantially, DF_UR/DF_LIVE could become
>> optional problems.
>>
>> A nit:
>>
>>   
> They can, but the information is not as precise. 

I mean, maybe some can without changes in code generation.  Possibly
they look at liveness information only for registers that they know
to have been initialized.

Paolo

References:
- [dataflow]: patch committed to improve -O0 performance.
  - From: Kenneth Zadeck
- Re: [dataflow]: patch committed to improve -O0 performance.
  - From: Paolo Bonzini
- Re: [dataflow]: patch committed to improve -O0 performance.
  - From: Kenneth Zadeck

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