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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/109829] Optimizing __builtin_signbit(x) ? -x
 : x or abs for FP
Date: Fri, 12 May 2023 18:16:55 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109829

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
   Last reconfirmed|                            |2023-05-12
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>From phiopt1:
phiopt match-simplify trying:
        _1 !=3D 0 ? iftmp.0_5 : x_3(D)

Where _1 is defined as:
  _1 =3D signbitD.1026 (x_3(D));
and iftmp.0_5 is defined as:
  iftmp.0_5 =3D -x_3(D);

This should fix it then:
(simplify
 (cond (ne (SIGNBIT @0) zero_p@1) (neg @0) @0)
 (abs @0))=