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<!-- Thanks for contributing a merge request! We recommend that first-time contributors read our [contribution guidelines](https://eigen.tuxfamily.org/index.php?title=Contributing_to_Eigen). Before submitting the MR, please complete the following checks: - Create one PR per feature or bugfix, - Run the test suite to verify your changes. See our [test guidelines](https://eigen.tuxfamily.org/index.php?title=Tests). - Add tests to cover the bug addressed or any new feature. - Document new features. If it is a substantial change, add it to the [Changelog](https://gitlab.com/libeigen/eigen/-/blob/master/CHANGELOG.md). - Leave the following box checked when submitting: `Allow commits from members who can merge to the target branch`. This allows us to rebase and merge your change. Note that we are a team of volunteers; we appreciate your patience during the review process. --> ### Description <!--Please explain your changes.--> Support AVX for i686. There was an existing work-around for windows. Added the more generic architecture comparison to also apply for linux. ### Reference issue <!-- You can link to a specific issue using the gitlab syntax #<issue number>. If the MR fixes an issue, write "Fixes #<issue number>" to have the issue automatically closed on merge. --> Fixes #2991. Closes #2991 See merge request libeigen/eigen!2037