https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107051
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This one is simple to fix.
Right now we reject the copy prop due to:
```
/* For 2 memory refences and using a temporary to do the copy,
don't remove the temporary as the 2 memory references might overlap.
Note t does not need to be decl as it could be field.
See PR 22237 for full details.
E.g.
t = *a; #DEST = SRC;
*b = t; #DEST2 = SRC2;
Cannot be convert into
t = *a;
*b = *a;
Though the following is allowed to be done:
t = *a;
*a = t;
And convert it into:
t = *a;
*a = *a;
*/
if (!operand_equal_p (dest2, src, 0)
&& !DECL_P (dest2) && !DECL_P (src))
return false;
```
What we need to detect here is that:
```
c = g_284[1];
g_284[0] = c;
```
can be handled.
The reason is that g_284[1] and g_284[0] don't overlap for the load/store.
