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From: "navidrahimi at microsoft dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/96779] Failure to optimize comparison of
 negative version of self
Date: Wed, 10 Nov 2021 19:50:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96779

navidrahimi <navidrahimi at microsoft dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |navidrahimi at microsoft d=
ot com

--- Comment #4 from navidrahimi <navidrahimi at microsoft dot com> ---
Hi Andrew,

I just used your code and added a check to check whether the type is wrappi=
ng
type:


(for cmp (eq ne)
 (simplify
  (cmp:c @0 (negate @0))
   (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
        && !TYPE_OVERFLOW_WRAPS (type))
    (cmp:c @0 { build_zero_cst (TREE_TYPE(@0)); })))))

This should work.=