David Spencer wrote:
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) :-)
I prefer (3) but I think it's not preferable by the admins since there is only:
i486
i686
x86_64
on the slackbuild template.
I think the i786 also have SSE2 commands but it is absent in the Slackbuild
template.
http://en.wikipedia.org/wiki/I786
http://en.wikipedia.org/wiki/SSE2
Can this software work with acceptable speed in old processors without SSE2?
(i686)
--
Michales Michaloudes
Thessaloniki
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