performance regression on sphereflake

[Gerolf Hoflehner]

Hi Rafael

it seems that  one of your commits modifies stack alignment (and consequently instruction selection) of not just APCS and results in a performance regression on sphereflake. Could you please take a look? 

Thanks
Gerolf

— svn rev 197526  
Author: Rafael Espindola <rafael.espindola at gmail.com>
Date:   Tue Dec 17 21:36:54 2013 +0000

    On APCS, only try to align aggregates to 32 bits instead of 64.
    
    This matches clang's behavior and since it is only a preference, it is not
    an ABI issue.
—

Sphereflake sample snippet (main()) with 32b (after) and 64b (before your change) stack alignment:

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