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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/95731] Faiilure to optimize a >= 0 && b >= 0
 to (a | b) >= 0
Date: Thu, 18 Jun 2020 08:41:19 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: easyhack, missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95731

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |easyhack,
                   |                            |missed-optimization

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  Two pieces depending on SHORT_CIRCUIT_...
maybe_fold_and_comparisons for ifcombine and a match.pd pattern for

  _1 =3D a_3(D) >=3D 0;
  _2 =3D b_4(D) >=3D 0;
  _5 =3D _1 & _2;

that should also make it work through maybe_fold_and_comparisons.  We have
something like this in fold-const.c btw.=