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e79c5149bf
This commit fixes the AVX512 implementations of psqrt in the same way that 3ed67cb0bb4af65fbf243df598604a8c7630bf7d fixed the AVX2 version of this function. The AVX512 versions of psqrt incorrectly return -0.0 for negative values, instead of NaN. Fixing the issues requires adding some additional instructions that slow down the algorithms. A similar test to the one used in 3ed67cb0bb4af65fbf243df598604a8c7630bf7d shows that the corrected Packet16f code runs at 73% of the speed of the existing code, while the corrected Packed8d function runs at 68% of the original.
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
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