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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/90304] -O3 vectorization gets worse when code
 is inlined
Date: Thu, 22 Jul 2021 21:48:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D90304

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|-O3 vectorization gets      |-O3 vectorization gets
                   |worse when code is moved    |worse when code is inlined
                   |into main()                 |
           Keywords|                            |alias

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Testcase:
int* ptr();

int f()
{
    int*__restrict result =3D ptr();
    int* first =3D ptr();
    int* second =3D ptr();

    for (int i =3D 0; i < 1024; ++i)
        result[i] =3D first[i] * second[i];
}
__attribute__((noinline))
void func(int*__restrict result, int* first, int* second)
{
    for (int i =3D 0; i < 1024; ++i)
        result[i] =3D first[i] * second[i];
}

int g()
{
    func(ptr(), ptr(), ptr());
}

Notice func is vectorized while f is not.=