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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/105820] [13 Regression] ICE in invert, at
 value-range.cc:1971
Date: Thu, 02 Jun 2022 12:18:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105820

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |13.0
                 CC|                            |amacleod at redhat dot com

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
#1  0x0000000001ced6a0 in irange::invert (this=3D0x7fffffff1f30)
    at /space/rguenther/src/gcc/gcc/value-range.cc:2166
2166      gcc_checking_assert (!undefined_p () && !varying_p ());

well, invert(undefined) =3D varying, invert(varying) =3D undefined - not su=
re
why we assert here.

(undefined is another name for 'empty')

I've wondered of several places checking for undefined/varying before
calling .invert () ...=