Benjamin.Rudiak-Gould at cl.cam.ac.uk
Thu May 11 08:21:00 EDT 2006
John Meacham wrote:
> also, incidentally, for anyone on x86 that cares about math performance,
> use -optc-fsse2 to make it use the much nicer math coprocessor available
> on modern x86 cpus.
I object to its characterization as "nicer". It's faster, but *lower
precision*. It worries me that people are so blithely abandoning those extra
bits in the name of speed. A few years from now there's going to be an
expensive engineering failure, and months of investigation will reveal that
it was because a math library was compiled for SSE2. Be careful out there.
(And while I'm on the subject, Haskell should have a LongDouble type.)
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