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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/97961] unnecessary moves with
 __builtin_{add,sub}_overflow_p and __int128
Date: Thu, 19 Jan 2023 23:23:44 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: missed-optimization, ra
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: DUPLICATE
X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97961

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 94804. The problem is arguments.
If we do:
```
bool f1(unsigned __int128 *a,unsigned __int128 *b) {
    return __builtin_add_overflow_p(*a, *b, (unsigned __int128)0);
}

bool f2(__int128 *a,__int128 *b) {
    return __builtin_add_overflow_p(*a, *b, (__int128)0);
}


bool f3(unsigned __int128 *a,unsigned __int128 *b) {
    return __builtin_sub_overflow_p(*a, *b, (unsigned __int128)0);
}

bool f4(__int128 *a,__int128 *b) {
    return __builtin_sub_overflow_p(*a, *b, (__int128)0);
}
```
We don't get extra mov's.

*** This bug has been marked as a duplicate of bug 94804 ***=