Why is 4x4 Matrix Multiplication in Eigen More Than Twice as Fast as 3x3?

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Why is 4x4 Matrix Multiplication in Eigen More Than Twice as Fast as 3x3?
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(stackoverflow.com/users/7624196/hiroishida)HiroIshida
(stackoverflow.com/users/12939557/j%c3%a9r%c3%b4me-richard)Jérôme Richard
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assembly c++ matrix-multiplication eigen simd



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