Refactoring for use in https://github.com/mingodad/squilu#20

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mingodad:dad-squilu

Commits on Jun 22, 2018

It seems that gcc can't optimize this so using simd here give us a good performance gain.
mingodad
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Commits on Jul 2, 2018

Refactoring to be able to use it on https://github.com/mingodad/squilu
mingodad
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