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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/111694] [13/14 Regression] Wrong behavior for
 signbit of negative zero when optimizing
Date: Wed, 04 Oct 2023 18:31:30 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.2.0
X-Bugzilla-Keywords: wrong-code
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X-Bugzilla-Who: amonakov at gcc dot gnu.org
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Message-ID: <bug-111694-4-eg0V6XKKA8@http.gcc.gnu.org/bugzilla/>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111694

Alexander Monakov <amonakov at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |amonakov at gcc dot gnu.org
          Component|web                         |tree-optimization
            Summary|Wrong behavior for signbit  |[13/14 Regression] Wrong
                   |of negative zero when       |behavior for signbit of
                   |optimizing                  |negative zero when
                   |                            |optimizing
           Keywords|                            |wrong-code

--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Reduced:

#define signbit(x) __builtin_signbit(x)

static void test(double l, double r)
{
  if (l =3D=3D r && (signbit(l) || signbit(r)))
    ;
  else
    __builtin_abort();
}

int main()
{
  test(0.0, -0.0);
}=