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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/107569] [13 Regression] Failure to optimize
 std::isfinite since r13-3596
Date: Mon, 27 Feb 2023 10:07:38 +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=3D107569

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |12.2.0
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-02-27

--- Comment #44 from Richard Biener <rguenth at gcc dot gnu.org> ---
I can confirm that foo() is still not optimized but we now optimize bar()
in VRP1.  VRP1 sees

bool foo (double x)
{
  bool _3;
  double _4;
  bool _5;

  <bb 2> [local count: 1073741824]:
  _4 =3D ABS_EXPR <x_2(D)>;
  _3 =3D _4 u> 1.79769313486231570814527423731704356798070567525844996599e+=
308;
  _5 =3D ~_3;
  if (_4 u> 1.79769313486231570814527423731704356798070567525844996599e+308)
    goto <bb 3>; [0.00%]
  else
    goto <bb 4>; [100.00%]

  <bb 3> [count: 0]:
  __builtin_unreachable ();

  <bb 4> [local count: 1073741824]:
  return _5;=