[Bug tree-optimization/99395] s116 benchmark of TSVC is vectorized by clang and not by gcc

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99395

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-03-05
                 CC|                            |rguenth at gcc dot gnu.org,
                   |                            |rsandifo at gcc dot gnu.org
           Keywords|                            |missed-optimization
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
          Component|middle-end                  |tree-optimization

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
please provide compilable testcases ...

Reduced testcase:

double a[1024];
void foo ()
{
  for (int i = 0; i < 1022; i += 2)
    {
      a[i] = a[i+1] * a[i];
      a[i+1] = a[i+2] * a[i+1];
    }
}