[Bug tree-optimization/98544] [11 regression] Wrong code generated by tree vectorizer since r11-3917-g28290cb50c7dbf87

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98544

--- Comment #19 from Martin Liška <marxin at gcc dot gnu.org> ---
> err
> 
> /* { dg-do run } */
> 
> double a[2], b[2], c[2], d[2];
> 
> void __attribute__((noipa))
> foo()
> {
>   double a0 = a[0];
>   double a1 = a[1];
>   double b0 = b[0];
>   double b1 = b[1];
>   double c0 = c[0];
>   double c1 = c[1];
>   double tem1 = a1 - b1;
>   double tem2 = a0 + b0;
>   d[0] = tem1 * c1;
>   d[1] = tem2 * c0;
> }
> 
> int main()
> {
>   a[0] = 1.;
>   a[1] = 2.;
>   b[0] = 3.;
>   b[1] = 4.;
>   c[0] = 2.;
>   c[1] = 3.;
>   foo ();
>   if (d[0] != -6. || d[1] != 8.)
>     __builtin_abort ();
>   return 0;
> }

This started to fail with -O3 since r11-3823-g126ed72b9f48f853 if it helps.