>       AIX does support Altivec.

Great, but not GCC as far as I can see:
[EMAIL PROTECTED]:~/build/gcc/powerpc-ibm-aix5.3> gcc/xgcc -Bgcc -E -dM t.h 
-maltivec 
| grep __ALTIVEC__
[EMAIL PROTECTED]:~/build/gcc/powerpc-ibm-aix5.3> 

So why not revert to the original BIGGEST_ALIGNMENT setting until Altivec is 
supported?  That would be more in keeping with all the other settings on AIX.

-- 
Eric Botcazou

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