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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/98265] [10/11 Regression] gcc-10 has significantly worse
 code generated with -O2 compared to -O1 (or gcc-9 -O2) when using the Eigen
 C++ library
Date: Mon, 04 Jan 2021 14:29:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98265

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|gcc-10 has significantly    |[10/11 Regression] gcc-10
                   |worse code generated with   |has significantly worse
                   |-O2 compared to -O1 (or     |code generated with -O2
                   |gcc-9 -O2) when using the   |compared to -O1 (or gcc-9
                   |Eigen C++ library           |-O2) when using the Eigen
                   |                            |C++ library
                 CC|                            |hubicka at gcc dot gnu.org
   Target Milestone|---                         |10.3
           Keywords|                            |missed-optimization

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
The TU might be too small so we run into inline limits too quickly?=