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With !406, we accidentally broke arm 32-bit NEON builds, since `vsqrt_f32` is only available for 64-bit. Here we add back the `rsqrt` implementation for 32-bit, relying on a `prsqrt` implementation with better handling of edge cases. Note that several of the 32-bit NEON packet tests are currently failing - either due to denormal handling (NEON versions flush to zero, but scalar paths don't) or due to accuracy (e.g. sin/cos).
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
For more information go to http://eigen.tuxfamily.org/.
For pull request, bug reports, and feature requests, go to https://gitlab.com/libeigen/eigen.
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