[Slackbuilds-users] sse2 optimisation

David Spencer baildon.research at googlemail.com
Sat Jun 26 12:58:36 UTC 2010

Greetings SlackPeople, may I ask your advice?

I'm doing a SlackBuild for Luminance HDR.  Its compiler flags assume
that SSE2 instructions are available.  That's a bad assumption, but
it's easy to make it configurable with a variable SSE2=yes|no and a
note in the README.

So, here's my question.  Should the SlackBuild's default be SSE2=yes,
or SSE2=no?  There are three obvious choices.

(1) The default should match upstream's assumption => SSE2=yes

(2) The default should work on any processor => SSE2=no

(3) Determine the default from the ARCH => if x86_64 then SSE2=yes else SSE2=no

Any thoughts?  I'm guessing everyone hates (3) :-)

Best regards
-Dave Spencer

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