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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/83541] Missed optimization with int overflow
Date: Sun, 12 Dec 2021 12:30:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D83541

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
           Keywords|                            |needs-bisection
      Known to work|                            |12.0
      Known to fail|                            |11.2.0

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Seems to be fixed on the trunk.




Folding statement: if (x_2(D) =3D=3D 2147483647)

Visiting conditional with predicate: if (x_2(D) =3D=3D 2147483647)

With known ranges
        x_2(D): int VARYING

Predicate evaluates to: DON'T KNOW
Matching expression match.pd:2077, gimple-match.c:819
Matching expression match.pd:2080, gimple-match.c:892
Matching expression match.pd:2087, gimple-match.c:952
Not folded
Folding statement: _4 =3D x_2(D) + 1;
gimple_simplified to _4 =3D -2147483648;
Folded into: _4 =3D -2147483648;

Folding statement: // predicted unlikely by early return (on trees) predict=
or.
Not folded
Folding PHI node: _1 =3D PHI <_4(3), 42(2)>
Queued PHI for removal.  Folds to: 42
Folding statement: return _1;
Folded into: return 42;=