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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/111431] a & (a == 0) is not optimized to 0
Date: Sat, 16 Sep 2023 02:53:47 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: missed-optimization, xfail
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111431

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The pattern should be:

(simplify
 (bit_and:c (convert@2 (eq @0 INTEGER_CST@1)) (convert? @0))
 (if ((wi::to_wide (@1) & 1) !=3D 0)
  @2
  { build_zero_cst (type); }))

Since 0/1 of the eq, the convert on the @0 inside the bit_and does not matt=
er.=