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From: "tobi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/95859] [10/11 regression] Statically true asserts not
 recognized as such with -O2, but with -O1, -Og, -O3
Date: Sat, 25 Jul 2020 12:37:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95859

Tobias Schl=C3=BCter <tobi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #48779|0                           |1
        is obsolete|                            |

--- Comment #8 from Tobias Schl=C3=BCter <tobi at gcc dot gnu.org> ---
Created attachment 48927
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D48927&action=3Dedit
Reduced testcase (32bit, preprocessed).

I've further reduced the testcase down to 800Kb.  Again this is with -m32. =
 I
removed the definition of void Eigen::internal::check_for_aliasing, so this
will appear in the assembly, but it's a no-op.

New version attached, compiler explorer version here
https://godbolt.org/z/h6YMeq

I've also reproduced the bug with 10.2=