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Commit f6b10ed8 authored by H.J. Lu's avatar H.J. Lu
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x86_64: Add log2 with FMA

On Skylake, it improves log2 bench performance by:

        Before       After     Improvement
max     208.779      63.827       69%
min     9.977        6.55         34%
mean    10.366       6.8191       34%
parent 542b1105
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