https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118557
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2025-01-19
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Couple of missed optimizations which is causing the vectorizer to decide to
over vectorize:
```
_15 = SR.26_4 + _21;
if (SR.26_4 != _15)
goto <bb 10>; [89.00%]
else
goto <bb 14>; [11.00%]
;; succ: 10 [89.0% ...
```
Should just be if (_21 != 0)
Note I change copy to be:
```static inline
void copy(span in, span out) {
auto f = in.begin();
auto o = out.begin();
auto s = in.size();
for(size_t t = 0; t < s; t++)
{
*o++ = *f++;
}
}
```
It works.
