announcing reference implementations for AVX approximation instructions

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announcing reference implementations for AVX approximation instructions

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Intel has posted an article containing reference implementations for the approximation instructions in AVX, AVX512F, and AVX512ER. (VRCP14*, VRSQRT14*, VRCP28*, VRSQRT28*, VEXP2*).

https://software.intel.com/en-us/articles/reference-implementations-for-IA-approximation-instructions-vrcp14-vrsqrt14-vrcp28-vrsqrt28-vexp2

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