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82d61af3a4
This is a new version of !423, which failed for MSVC. Defined `EIGEN_OPTIMIZATION_BARRIER(X)` that uses inline assembly to prevent operations involving `X` from crossing that barrier. Should work on most `GNUC` compatible compilers (MSVC doesn't seem to need this). This is a modified version adapted from what was used in `psincos_float` and tested on more platforms (see #1674, https://godbolt.org/z/73ezTG). Modified `rint` to use the barrier to prevent the add/subtract rounding trick from being optimized away. Also fixed an edge case for large inputs that get bumped up a power of two and ends up rounding away more than just the fractional part. If we are over `2^digits` then just return the input. This edge case was missed in the test since the test was comparing approximate equality, which was still satisfied. Adding a strict equality option catches it.
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
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