[Bug tree-optimization/89317] Ineffective code from std::copy

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89317

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #5)
> Reduced testcase for that issue:
> struct { int data[16]; } *x;
> int foo (int n1)
> {
>   int *a = x->data;
>   int *b = ((int*)x) + 4;
>   return b - a;
> }
Better one:
struct b { int data[16]; };

int foo (struct b *x)
{
  int *a = x->data;
  int *b = ((int*)x) + 4;
  return b - a;
}