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AltiVec wouldn't help with this particular code. It uses doubles because it needs a guaranteed 53bits of accuracy in the mantissa. Floats are not accurate enough, and that's the biggest thing AltiVec handles. It's unfortunate, but it's just not what AltiVec was made for.
-Rob
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There are only 10 kinds of people in the world:
Those who understand binary, and those who don't.
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