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When we dropped -mtune=atom for Fedora 26, this did not enable generic tuning, but tuning for plain i686 (Pentium Pro). This is probably not what we want. We should use -march=i686 -mtune=generic instead.
Also fixed bug #1538648 [1] thanks [1] https://koji.fedoraproject.org/koji/taskinfo?taskID=24445028