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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/103406] gcc -O0 behaves differently on "DBL_MAX related
 operations" than gcc -O1 and above
Date: Wed, 24 Nov 2021 11:29:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103406

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Hmm, the trunk is constant folding (maybe wrong?).

We used to get for 11.1.0:
  _1 =3D 1.79769313486231570814527423731704356798070567525844996599e+308 *
2.0e+0;
  _2 =3D 1.79769313486231570814527423731704356798070567525844996599e+308 *
2.0e+0;
  _3 =3D _1 - _2;
  x_6 =3D -_3;

But now we get 0.0.=