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Re: Opinions on packaging ATLAS (for the x86 architecture)



2009/9/25 Deji Akingunola

Actually the atlas x86_64 package is using SSE3 by default. I believe
SSE3 is the least common denominator for the x86_64 cpus. And yes,
whatever is determined for the x86_32 situation will also apply for
SSE4* for x86_64.

Deji


Ok, this obviously means that  AMD64 processors based upon the cores Sledgehammer (steppings C0, CG) and Clawhammer (stepping CG) will report illegal operations because they do not support SSE3, only cores from San Diego (stepping E4) on. Thus, it looks like there is actually a need for distinct packages

    atlas.x86_64 < atlas-sse3.x86_64  [ < atlas -sse4.x < .. ]

All not that obvious after all ..

~C

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