[MacPorts] #28512: atlas wont compile

[MacPorts]

#28512: atlas wont compile
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 Reporter:  macports@…              |       Owner:  jameskyle@…           
     Type:  defect                  |      Status:  new                   
 Priority:  Normal                  |   Milestone:                        
Component:  ports                   |     Version:  1.9.99                
 Keywords:                          |        Port:  atlas                 
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Comment(by vince@…):

 Replying to [comment:65 ryandesign@…]:

 > I don't know what the advantages for atlas are for building ppc64. I
 understand that in general ppc64 has few benefits over ppc. Obviously
 there's the ability to deal with more than 4GB of data in a single
 process; the only other noticeable difference I'm aware of is that memory
 addresses take twice as much space to store, so you can fit fewer of them
 in cache, which could actually hurt performance. This is in stark contrast
 to the difference between i386 and x86_64; x86_64 adds additional
 registers and fixes several problems with the legacy i386 architecture,
 thus offering several speed and efficiency benefits over i386 beyond the
 ability to address more memory.

 I will look to see if there is any significant performance increase in
 floating-point computation between ppc and ppc64. The best way to know
 would be to compile Atlas using build_arch = ppc, then ppc64 and compare
 the internal benchmarks!

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Ticket URL: <https://trac.macports.org/ticket/28512#comment:71>
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