[rfc] coalesce stack slots

[Vladimir Makarov]

Richard Henderson wrote:

>On Tue, Sep 07, 2004 at 05:22:53PM -0400, Vladimir Makarov wrote:
>  
>
>>This weekend I got some SPECINT results for your patch for P4.  I've
>>checked -mtune=i386 and -march=i386/-mtune=pentium4.  I am sorry,
>>Richard but in overall the score with the patch results in about 0.5%
>>slower code.  I think freedom in insn scheduling (performed by P4) is
>>more important then better data locality for SPECINT.
>>    
>>
>
>Any chance you could point me at the particular variables being combined
>in SPECINT that is causing the problem?  I have trouble believing that
>many such variables exist.
>
>  
>
Sorry, Richard.  I have no idea where the problem occurs.  It requires 
big work to analyze that.  IMHO, the best test for this is vortex 
(becuase the biggest degradation -- about 2-3%). I don't remeber why but 
I got a conclusion that vortex benchmark has a lot of parallelism.

Vlad