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Summary: Instead of the usual division, we can use the division of 1 by the number (reciprocal) and multiplying it by the dividend in the original fraction. Also, the use of Vc::reciprocal() and intrinsics using SSE in total gives us an acceleration of up to 30%. {F3862276} {F3862275}. Reviewers: dkazakov, #krita Reviewed By: dkazakov, #krita Subscribers: alvinhochun, woltherav Tags: #krita Differential Revision: https://phabricator.kde.org/D7314
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