https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122140
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2025-10-03
Status|UNCONFIRMED |NEW
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>wich performs an operation equivalent to: __builtin_memmove (a+2, a+1, 4).
Actually it is worse the other part of the test is just garbage.
But the problem is here:
/* Emit the "backwards" unrolled loop. */
emit_move_loop (src, dst, mode, size_bytes, -inc, iters, remainder);
There is an off by one error here for the offset. It should be size_bytes - 1.
Even this produces wrong code:
```
void foo (char *a, char *b)
{
__builtin_memmove (a, b, 4);
}
```
