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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/35226] Induction with multiplication are not
 vectorized
Date: Mon, 18 Mar 2024 07:29:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D35226

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

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

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Alan Lawrence from comment #1)
> Multiplication reductions are supported, certainly in gcc 4.9, I think
> longer. However, the following induction does not vectorize on gcc 6
> development branch (x86_64, -O3, with or without -mavx or -msse2):

That in turn was fixed in GCC 13 (or rather it was PR 103144 ).

For reduction:
```
int a[1024];

int
f (void)
{
  int p =3D 1;
  for (int i =3D 0; i < 1024; i++, p*=3D2)
    p *=3D a[i];
    return p;
}
```

That was fixed in GCC 8 (I can't find the patch currectly).

So closing as fixed.=